Ice melting device and control method and apparatus therefor

Abstract

Disclosed in the embodiments of the present application are an ice melting device and a control method and apparatus therefor. The ice melting device comprises a rectifier circuit, a controller, and an energy storage circuit that can switch between a charging state and a discharging state, wherein a first end of the rectifier circuit is connected to a first end of the energy storage circuit, and a second end of the rectifier circuit is connected to a second end of the energy storage circuit; the first end of the rectifier circuit and the first end of the energy storage circuit are connected to one end of a power transmission line that comprises at least two ends, and the second end of the rectifier circuit and the second end of the energy storage circuit are connected to the other end of the power transmission line; and the controller is connected to the rectifier circuit and the energy storage circuit. By means of the ice melting device provided in the embodiments of the present application, the utilization rate of the ice melting device can be increased, and the manufacturing costs of the ice melting device can also be reduced.

Description

Ice melting equipment and control method and device thereof

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311630353.5, filed on November 30, 2023, entitled “Ice-melting equipment and its control method and device,” and the entire contents of that application are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to an ice melting device and a control method and device thereof. Background Art

[0004] In winter, when the temperature is low and the humidity is high, transmission lines are prone to ice accumulation, which affects the stability of power supply. In order to reduce the impact of line ice accumulation on power supply, in related technologies, energy storage devices, such as batteries, can be used as ice-melting power sources and connected to transmission lines to melt the ice. However, if only energy storage devices are used as ice-melting power sources, the energy storage devices will be out of service for a long time due to the short time required for ice melting, resulting in low equipment utilization, making it difficult to detect equipment failures in a timely manner, and often unable to be used when ice melting is required. In addition, since ice melting is usually performed on high-voltage lines, energy storage devices with larger electrical parameters are required for ice melting, resulting in higher manufacturing costs for ice melting equipment. Summary of the Invention

[0005] In view of the above problems, the present application provides an ice melting device and a control method and device thereof, which can reduce the manufacturing cost of the ice melting device while improving the utilization rate of the ice melting device.

[0006] In a first aspect, an embodiment of the present application provides an ice melting device, comprising a rectifier circuit, a controller, and an energy storage circuit capable of switching between charge and discharge states; the first end of the rectifier circuit is connected to the first end of the energy storage circuit, and the second end of the rectifier circuit is connected to the second end of the energy storage circuit; the first end of the rectifier circuit and the first end of the energy storage circuit are connected to one end of a transmission line comprising at least two ends, and the second end of the rectifier circuit and the second end of the energy storage circuit are connected to the other end of the transmission line; the controller is connected to the rectifier circuit and the energy storage circuit.

[0007] The technical solution of the embodiment of the present application switches the energy storage circuit to an energy storage state, i.e., a cyclic charge-discharge state, when ice melting is not required. In the charging state, the energy storage circuit is charged by the grid connected to the rectifier circuit. In the discharging state, the grid connected to the rectifier circuit is charged by the energy storage circuit. This prevents the ice melting equipment from being out of service for a long time, thereby improving the utilization rate of the ice melting equipment and promptly detecting any abnormalities in the ice melting equipment. Furthermore, when ice melting is required, the rectifier circuit and the energy storage circuit can be used together to melt ice on the transmission line, enabling long-distance ice melting on the transmission line. The energy required to melt the ice on the transmission line can be shared by the rectifier circuit and the energy storage circuit, eliminating the need to use a rectifier circuit or energy storage circuit with larger electrical parameters for ice melting, thereby reducing the manufacturing cost of the ice melting equipment.

[0008] In some embodiments, the energy storage circuit includes an energy storage unit connected to the rectifier circuit; the energy storage unit includes multiple series-connected energy storage groups, each including a battery pack and power modules connected to both ends of the battery pack; and the controller is connected to the power modules. Because the energy storage unit is composed of a series connection of battery packs and power modules, in addition to switching the charge and discharge states of the energy storage circuit by adjusting the power modules in the energy storage group, the output voltage of the entire energy storage unit can also be adjusted by adjusting the power modules in the energy storage group to adapt to the ice-melting voltage required by the transmission line during ice melting, thereby improving the reliability and ice-melting efficiency of the ice-melting equipment.

[0009] In some embodiments, the rectifier circuit includes a rectifier unit and a first switch unit, wherein a first end of the first switch unit is connected to the rectifier unit, a second end of the first switch unit is connected to the energy storage circuit, and a second end of the first switch unit is connected to the transmission line; and the controller is connected to the first switch unit. By providing the rectifier unit and the first switch unit in the rectifier circuit, when long-term de-icing is required or the line to be de-iced is long, the first switch unit can be controlled to close to select energy provided by the grid to de-iced the transmission line. When short-term de-icing is required for a shorter transmission line, the first switch unit can be controlled to open to select energy provided by the energy storage circuit to de-iced the transmission line. This can meet different de-icing requirements of the transmission line and improve the de-icing efficiency of the transmission line.

[0010] In some embodiments, the first switch unit includes a first power switch and a second power switch; the first end of the first power switch is connected to the first end of the rectifier unit, the second end of the first power switch is connected to the first end of the energy storage circuit, and the second end of the first power switch is connected to one end of the transmission line; the first end of the second power switch is connected to the second end of the rectifier unit, the second end of the second power switch is connected to the second end of the energy storage circuit, and the second end of the second power switch is connected to the other end of the transmission line. In this way, when the rectifier circuit is no longer needed for power supply, the first and second power switches can be disconnected simultaneously to completely disconnect the rectifier circuit, avoiding the situation where one switch is stuck and the rectifier circuit cannot be disconnected, thereby improving the reliability of the ice melting equipment.

[0011] In some embodiments, the energy storage circuit further includes a second switch unit, a first end of which is connected to the energy storage unit, a second end of which is connected to the rectifier circuit, and a second end of which is connected to a power transmission line; and the controller is connected to the second switch unit. By providing the second switch unit in the energy storage circuit, the various ice melting requirements of various ice melting devices can be met by switching the second switch unit.

[0012] In some embodiments, the second switch unit includes a first switch and a second switch; the first end of the first switch is connected to the first end of the energy storage unit, the second end of the first switch is connected to the first end of the rectifier circuit, and the second end of the first switch is connected to one end of the transmission line; the first end of the second switch is connected to the second end of the energy storage unit, the second end of the second switch is connected to the second end of the rectifier circuit, and the second end of the second switch is connected to the other end of the transmission line. Because the first switch and the second switch are connected to the two ends of the energy storage unit, respectively, when the energy storage circuit is no longer needed for power supply, the first switch and the second switch can be disconnected simultaneously to completely disconnect the energy storage circuit, thereby avoiding the situation where a switch is stuck and the energy storage circuit cannot be disconnected, thereby improving the reliability of the ice melting device.

[0013] In some embodiments, the energy storage circuit further includes a reactor; the reactor is arranged between the energy storage unit and the rectifier circuit to filter the current input to the energy storage unit, suppress surge and harmonic current, thereby improving the safety of the energy storage circuit and further improving the reliability of the ice melting equipment.

[0014] In some embodiments, the ice-melting device further includes a third switch unit disposed between the energy storage circuit and the power transmission line; the controller is connected to the third switch unit. This allows the third switch unit to be disconnected to stop powering the power transmission line when ice melting is not required, eliminating the need to disconnect the switch units of the rectifier circuit and the energy storage circuit, thereby improving the operating efficiency of the ice-melting device.

[0015] In some embodiments, the third switch unit includes a first ice-melt switch and a second ice-melt switch; the first end of the first ice-melt switch is connected to the first end of the rectifier circuit and the first end of the energy storage circuit, and the second end of the first ice-melt switch is connected to one end of the transmission line; the first end of the second ice-melt switch is connected to the second end of the rectifier circuit and the second end of the energy storage circuit, and the second end of the second ice-melt switch is connected to the other end of the transmission line. Because the first and second ice-melt switches are respectively provided at the two ends for accessing the transmission line, when the transmission line does not need to be melted, the first and second ice-melt switches can be opened simultaneously to completely disconnect the ice-melting equipment from the transmission line. This prevents a situation where one of the ice-melt switches becomes stuck and cannot disconnect the transmission line, further improving the reliability of the ice-melting equipment.

[0016] In some embodiments, the ice-melting device further includes a first phase line switch, a second phase line switch, a third phase line switch, and a fourth phase line switch; the first ends of the first phase line switch and the second phase line switch are connected to the first end of the energy storage circuit; the second end of the second phase line switch is connected to the first end of the third phase line switch, the second end of the third phase line switch is connected to the second end of the energy storage circuit, and the first end of the fourth phase line switch; the second end of the first phase line switch is connected to the first phase line of the transmission line, the second end of the second phase line switch and the second end of the third phase line switch are connected to the second phase line of the transmission line, and the second end of the fourth phase line switch is connected to the third phase line of the transmission line. In this way, ice melting can be achieved on different phases by switching the first phase line switch, the second phase line switch, the third phase line switch, and the fourth phase line switch, thereby improving the flexibility of ice melting.

[0017] In a second aspect, the present application provides a control method for an ice-melting device, which is applied to the ice-melting device in any of the above embodiments, wherein the ice-melting device is connected to the power grid through the third end of the rectifier circuit, and the method includes: obtaining the ice-melting demand of the transmission line; when there is an ice-melting demand on the transmission line, controlling at least one of the rectifier circuit or the energy storage circuit to switch to an ice-melting state to provide current to the transmission line; or, when there is no ice-melting demand on the transmission line, controlling the rectifier circuit and the energy storage circuit to switch to an energy storage state to provide power consumption to the power grid.

[0018] In the technical solution of the embodiment of the present application, when it is detected that the transmission line needs to melt ice, at least one of the rectifier circuit or the energy storage circuit is controlled to switch to the ice melting state to supply current to the transmission line. When it is detected that the transmission line does not need to melt ice, the rectifier circuit and the energy storage circuit are controlled to switch to the energy storage state to provide power to the power grid. Therefore, when ice melting is not required, the rectifier circuit and the energy storage circuit can be controlled to switch to the energy storage state to store energy, thereby avoiding the ice melting equipment being out of service for a long time. This can improve the utilization rate of the ice melting equipment and promptly detect possible anomalies in the ice melting equipment. Moreover, when ice melting is required, one of the grid or the energy storage circuit connected to the rectifier circuit can be controlled to melt ice for the transmission line, thereby meeting the ice melting needs in different situations and improving ice melting efficiency.

[0019] In some embodiments, obtaining the ice melting requirement of the transmission line includes:

[0020] Monitor the icing parameter of the transmission line, compare it with the icing threshold parameter, and determine the de-icing requirement of the transmission line; or receive a de-icing request sent by the transmission line.

[0021] In some embodiments, when there is a need to melt ice on the transmission line, controlling at least one of the rectifier circuit or the energy storage circuit to switch to a melting state to provide current to the transmission line includes: when there is a need to melt ice on the transmission line, controlling at least one of the first switch unit of the rectifier circuit or the second switch unit of the energy storage circuit to be closed, so as to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line.

[0022] In some embodiments, controlling at least one of the first switch unit of the rectifier circuit or the second switch unit of the energy storage circuit to close so as to control the power grid to which the rectifier circuit is connected or at least one of the energy storage circuits to provide current to the transmission line includes: in response to the closing of the third switch unit, controlling at least one of the first switch unit or the second switch unit to close so as to control the power grid to which the rectifier circuit is connected or at least one of the energy storage circuits to provide current to the transmission line; wherein the third switch unit is arranged between the energy storage circuit and the transmission line.

[0023] In some embodiments, controlling at least one of the first switch unit or the second switch unit to be closed to control the power grid to which the rectifier circuit is connected or at least one of the energy storage circuits to provide current to the transmission line includes: controlling at least one of the first switch unit or the second switch unit to be closed based on de-icing requirement information of the transmission line to control the power grid to which the rectifier circuit is connected or at least one of the energy storage circuits to provide current to the transmission line; wherein the de-icing requirement information includes at least one of a de-icing voltage, a de-icing current, or a de-icing duration required for the transmission line to complete de-icing.

[0024] In some embodiments, based on the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, including: determining that the ice melting voltage is lower than the operating voltage of the rectifier circuit, controlling the first switch unit to be disconnected, the second switch unit to be closed, and switching the energy storage circuit to a discharge state to control the energy storage circuit to provide current to the transmission line.

[0025] In some embodiments, based on the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, including: determining that the ice melting voltage reaches the operating voltage of the rectifier circuit, and controlling the first switch unit to be closed to control the power grid connected to the rectifier circuit to provide current to the transmission line.

[0026] In some embodiments, based on the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, including: determining that the ice melting voltage reaches the operating voltage of the rectifier circuit and the ice melting current is greater than the rated current of the rectifier circuit, controlling the first switch unit and the second switch unit to be closed, and switching the energy storage circuit to a discharge state to control the power grid connected to the rectifier circuit and the energy storage circuit to provide current to the transmission line.

[0027] In some embodiments, based on the de-icing demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed to control the power grid connected to the rectifier circuit or at least one of the energy storage circuit to provide current to the transmission line, including: determining that the de-icing voltage reaches the operating voltage of the rectifier circuit and the discharge time of the energy storage circuit is less than the de-icing time, controlling the first switch unit and the second switch unit to be closed, and switching the energy storage circuit to a discharge state to control the power grid connected to the rectifier circuit and the energy storage circuit to provide current to the transmission line; wherein the discharge time is determined according to the current capacity of the energy storage circuit and the de-icing current.

[0028] In some embodiments, when there is no ice melting demand on the transmission line, the energy storage circuit is switched to an energy storage state to provide power consumption to the power grid, including: when there is no ice melting demand on the transmission line, controlling the first switch unit of the rectifier circuit and the second switch unit of the energy storage circuit to be closed, and switching the energy storage circuit to an energy storage state to control the power grid connected to the rectifier circuit to supply power to the energy storage circuit.

[0029] In some embodiments, controlling the first switch unit and the second switch unit to close includes: controlling the first switch unit and the second switch unit to close in response to the opening of a third switch unit; wherein the third switch unit is arranged between the energy storage circuit and the transmission line.

[0030] In the third aspect, the present application provides a battery replacement connector detection device, which is applied to the ice melting equipment of any of the above embodiments, and the device includes: a demand acquisition module, which is used to obtain the ice melting demand of the transmission line; a circuit control module, which is used to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line when there is an ice melting demand on the transmission line; or, when there is no ice melting demand on the transmission line, control the rectifier circuit and the energy storage circuit to switch to the energy storage state to provide power absorption to the power grid.

[0031] In the technical solution of the embodiment of the present application, when it is detected that the transmission line needs to melt ice, at least one of the rectifier circuit or the energy storage circuit is controlled to switch to the ice melting state to supply current to the transmission line. When it is detected that the transmission line does not need to melt ice, the rectifier circuit and the energy storage circuit are controlled to switch to the energy storage state to provide power to the power grid. Therefore, when ice melting is not required, the energy storage circuit can be controlled to switch to the energy storage state for charging, thereby preventing the ice melting equipment from being out of service for a long time, thereby improving the utilization rate of the ice melting equipment and promptly detecting any abnormalities in the ice melting equipment. Moreover, when ice melting is required, one of the grid or the energy storage circuit connected to the rectifier circuit can be controlled to melt ice for the transmission line, thereby meeting the ice melting needs in different situations and improving ice melting efficiency.

[0032] In a fourth aspect, the present application provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the method in the implementation of the second aspect when executing the computer program.

[0033] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method in the implementation of the second aspect is performed.

[0034] In a sixth aspect, the present application provides a computer program product, which, when running on a computer, enables the computer to execute the method in the implementation of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0036] FIG1 is a first structural diagram of an ice melting device according to some embodiments of the present application;

[0037] FIG2 a is a second structural diagram of an ice melting device according to some embodiments of the present application;

[0038] FIG2 b is a structural diagram of an energy storage group in some embodiments of the present application;

[0039] FIG3 is a third structural diagram of an ice melting device according to some embodiments of the present application;

[0040] FIG4 is a fourth structural diagram of an ice melting device according to some embodiments of the present application;

[0041] FIG5 is a fifth structural diagram of an ice melting device according to some embodiments of the present application;

[0042] FIG6 is a sixth structural diagram of an ice melting device according to some embodiments of the present application;

[0043] FIG7 is a seventh structural diagram of an ice melting device according to some embodiments of the present application;

[0044] FIG8 is an eighth structural diagram of an ice melting device according to some embodiments of the present application;

[0045] FIG9 is a ninth structural diagram of an ice melting device according to some embodiments of the present application;

[0046] FIG10 is a tenth structural diagram of an ice melting device according to some embodiments of the present application;

[0047] FIG11 is a flow chart of a method for controlling an ice melting device according to some embodiments of the present application;

[0048] FIG12 is a schematic structural diagram of a control device for an ice melting device according to some embodiments of the present application;

[0049] FIG13 is a schematic structural diagram of an electronic device according to some embodiments of the present application.

[0050] Some of the figure numbers in the specific implementation manner are as follows: 10-rectifier circuit; 20-energy storage circuit; 30-transmission line; 100-rectifier unit; 102-energy storage unit; 1021-energy storage group; S1-first power supply switch; S2-second power supply switch; S3-first switching switch; S4-second switching switch; L-reactor; S5-first ice melting switch; S6-second ice melting switch; S7-first phase line switch; S8-second phase line switch; S9-third phase line switch; S10-fourth phase line switch; 210-demand acquisition module; 220-circuit control module; 300-electronic device; 301-processor; 302-memory; 303-communication bus. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0054] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0056] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0058] Transmission lines are prone to ice buildup in cold and humid winter conditions. Severe ice buildup can increase line sag, causing short circuits and disrupting power supply stability. Therefore, to mitigate the impact of ice buildup on power supply, ice-melting treatment is necessary.

[0059] Currently, the method of melting ice-covered transmission lines is usually to add energy storage devices such as batteries in the substation as a power source for melting ice. When the transmission line needs to be melted, the energy storage device provides energy to the transmission line, causing the transmission line to heat up and thus melt the ice. However, since the need for ice melting usually occurs in winter, there is no need for ice melting most of the time. Therefore, if an energy storage device is used as a power source for ice melting, the energy storage device will be in an outage state for a long time due to the short time required for ice melting. The equipment utilization rate is low, making it difficult to detect equipment failures in time, and it is often unusable when ice melting is needed. In addition, since ice melting is usually performed on high-voltage lines, energy storage devices with larger electrical parameters are required for ice melting, resulting in high manufacturing costs for ice melting equipment.

[0060] To address the above technical issues, an embodiment of the present application provides an ice-melting device for installation in a substation. The ice-melting device includes a rectifier circuit and an energy storage circuit capable of switching between charge and discharge states. The first end of the rectifier circuit is connected to the first end of the energy storage circuit, and the second end of the rectifier circuit is connected to the second end of the energy storage circuit. The first and second ends of the rectifier circuit are connected to one end of a power transmission line having at least two terminals, and the first and second ends of the energy storage circuit are connected to the other end of the power transmission line, so that the rectifier circuit and the energy storage circuit form a current loop with the power transmission line. The third end of the rectifier circuit is connected to the power grid. Because the energy storage circuit is connected to the rectifier circuit and can switch between charge and discharge states, when ice melting is not required, the energy storage circuit can be switched to a charging state, charging the energy storage circuit through the power grid connected to the rectifier circuit, or switched to a discharging state, charging the power grid connected to the rectifier circuit through the energy storage circuit. This prevents the ice-melting device from being out of service for extended periods of time, thereby improving the utilization rate of the ice-melting device and promptly detecting any abnormalities in the ice-melting device. When ice melting is required, the rectifier circuit and the energy storage circuit can be used together to melt the ice for the transmission line, thereby realizing ice melting for long-distance transmission lines. The energy for melting the ice for the transmission line can be shared by the rectifier circuit and the energy storage circuit. Therefore, there is no need to use a rectifier circuit or energy storage circuit with larger electrical parameters to melt the ice, thereby reducing the manufacturing cost of the ice melting equipment.

[0061] In addition, when long-term ice melting is required or the line to be melted is long, the energy provided by the power grid and the energy storage circuit can be used to melt the ice for the transmission line. When short-term ice melting is required for a short transmission line, the energy provided by the energy storage circuit can be used to melt the ice for the transmission line. This can meet the different ice melting requirements of the transmission line and improve the ice melting efficiency of the transmission line.

[0062] According to some embodiments of the present application, an ice-melting device is provided, as shown in FIG1 . The ice-melting device includes a rectifier circuit 10, a controller, and a tank circuit 20 capable of switching between charge and discharge states. A first end of the rectifier circuit 10 is connected to a first end of the tank circuit 20, and a second end of the rectifier circuit 10 is connected to a second end of the tank circuit 20. The first end of the rectifier circuit 10 and the first end of the tank circuit 20 are connected to one end of a power transmission line 30 having at least two terminals, and the second end of the rectifier circuit 10 and the second end of the tank circuit 20 are connected to the other end of the power transmission line 30, so that the rectifier circuit 10 and the tank circuit 20 form a current loop with the power transmission line 30. A controller is connected to the rectifier circuit 10 and the tank circuit 20. A third end of the rectifier circuit 30 is connected to the power grid.

[0063] The first end of the rectifier circuit 10 and the first end of the energy storage circuit 20 can be connected to one end of the transmission line 30 via a de-icing busbar. The second end of the rectifier circuit 10 and the second end of the energy storage circuit 20 can be connected to the second end of the transmission line 30 via a de-icing busbar. The de-icing busbar may include a heating cable. The transmission line 30 may be a DC transmission line or an AC transmission line. The rectifier circuit 10 is used to convert AC power input from the power grid into DC power, or to convert DC power input from the energy storage circuit into AC power. Specifically, the rectifier circuit 10 can be a rectifier circuit with output voltage regulation capability. For example, the rectifier circuit 10 can be composed of a modular multi-level structure, so that the output voltage can be adjusted as needed.

[0064] The first end of the rectifier circuit 10 can be a DC output terminal of the rectifier circuit 10, and the second end of the rectifier circuit 10 can be a DC input terminal of the rectifier circuit 10. The rectifier circuit 10 also includes a third end connected to the power grid, which can be an AC input terminal of the rectifier circuit 10 to receive AC power input from the power grid. The first end of the energy storage circuit 20 can be a positive electrode of the energy storage circuit 20, and the second end of the energy storage circuit 20 can be a negative electrode of the energy storage circuit 20. The energy storage circuit 20 can include a battery pack and a charge-discharge circuit for controlling the charge and discharge switching of the battery pack, such as an RC charge-discharge circuit. Alternatively, the charge-discharge circuit can include a switch module, a first diode, and a second diode. The switch module can be a relay, an isolating switch, or a thyristor, such as an IGBT. The positive electrode of the battery is connected to the first end of the switch module and the positive electrode of the first diode. The first end of the switch module is connected to the cathode of the second diode. The cathode of the first diode and the positive electrode of the second diode form the first end of the energy storage circuit, and the cathode of the battery pack forms the second end of the energy storage circuit. When the switch module is disconnected, the battery pack can discharge through the first diode, thereby switching the energy storage circuit 20 to a discharge mode. When the switch module is closed, the battery pack can receive an external charging voltage through the second diode, thereby switching the energy storage circuit 20 to a charge mode. Alternatively, the switch module may include a MOS driver module for outputting a level signal and an N-channel MOS transistor. The output end of the MOS driver module is connected to the gate of the N-channel MOS transistor, the positive electrode of the battery is connected to the source of the N-channel MOS transistor and the positive electrode of the first diode, the drain of the N-channel MOS transistor is connected to the cathode of the second diode, the cathode of the first diode and the positive electrode of the second diode serve as the first end of the energy storage circuit, and the cathode of the battery pack serves as the second end of the energy storage circuit. When the MOS driver module is turned off, such as when the controller controls the MOS driver module to turn off, the gate level of the N-channel MOS transistor is low, and the N-channel MOS transistor is turned off. At this time, the battery pack can discharge through the first diode, thereby switching the energy storage circuit 20 to a discharge mode. When the MOS driver module is turned on, such as when the controller controls the MOS driver module to be turned on, the gate level of the N-channel MOS transistor is high, and the N-channel MOS transistor is turned on. At this time, the battery pack can receive the external charging voltage through the second diode, thereby switching the energy storage circuit 20 to the charging mode. In addition to the above two charging and discharging circuits, other conventional charging and discharging circuits can also be used to implement the charging and discharging switching of the energy storage circuit.

[0065] In some embodiments, when the third terminal of the rectifier circuit 10 is connected to the power grid and the rectifier circuit 10 and the energy storage circuit 20 are connected in parallel to the transmission line 30, the utilization rate of the de-icing device can be improved by adjusting the operating state of the energy storage circuit 20. For example, when de-icing is not required on the transmission line 30, the controller can switch the energy storage circuit 20 to a charging state. In this state, the rectifier circuit 10 and the energy storage circuit 20 form a loop, so that the rectifier circuit 10 converts the AC power from the power grid into DC power, and the DC power output by the rectifier circuit 10 is used to charge the energy storage circuit 20. When de-icing is required on the transmission line 30, the controller can switch the energy storage circuit 20 to a discharging state. In this state, the rectifier circuit 10 and the energy storage circuit 20 act as two parallel power supplies. The DC power output by the rectifier circuit 10 and the energy storage circuit 20 can be used to power the transmission line 30, thereby generating heat on the transmission line 30 to achieve de-icing. Since the energy for melting ice for the transmission line 30 can be shared by the rectifier circuit 10 and the energy storage circuit 20, there is no need to use the rectifier circuit 10 and the energy storage circuit 20 with larger electrical parameters to melt ice, thereby reducing the manufacturing cost of the energy storage device.

[0066] An ice-melting device is provided, comprising a rectifier circuit, a controller, and an energy storage circuit capable of switching between charge and discharge states. A first end of the rectifier circuit is connected to a first end of the energy storage circuit, a second end of the rectifier circuit is connected to a second end of the energy storage circuit, the first end of the rectifier circuit and the first end of the energy storage circuit are connected to one end of a power transmission line, and the second end of the rectifier circuit and the second end of the energy storage circuit are connected to the other end of the power transmission line, so that the rectifier circuit and the energy storage circuit form a current loop with the power transmission line. The controller is connected to the rectifier circuit and the energy storage circuit. Therefore, when ice melting is not required, the energy storage circuit can be switched to a charging state to charge the energy storage circuit via the power grid connected to the rectifier circuit, or switched to a discharging state to charge the power grid connected to the rectifier circuit via the energy storage circuit. This prevents the ice-melting device from being out of service for an extended period of time, thereby improving the utilization rate of the ice-melting device and promptly detecting any abnormalities in the ice-melting device. When ice melting is required, the rectifier circuit and the energy storage circuit can be used together to melt the ice for the transmission line. That is, the energy for melting the ice for the transmission line can be shared by the rectifier circuit and the energy storage circuit. Therefore, there is no need to use a rectifier circuit or an energy storage circuit with larger electrical parameters to melt the ice, thereby reducing the manufacturing cost of the ice melting equipment.

[0067] In addition, when the transmission line 30 needs to be de-iced and the energy storage circuit 20 needs to be charged, the energy storage circuit 20 can be switched to a charging state. At this time, the rectifier circuit 10 is equivalent to a main circuit, and the energy storage circuit 20 and the transmission line 30 are equivalent to branches. Thus, the DC power output by the rectifier circuit 10 can be used to power the transmission line 30 to make the transmission line 30 heat up to achieve de-icing. At the same time, the DC power output by the rectifier circuit 10 can also be used to charge the energy storage circuit 20, thereby simultaneously meeting the needs of de-icing the transmission line and charging the energy storage circuit.

[0068] To improve the reliability and efficiency of ice-melting equipment, in some embodiments, as shown in Figure 2a, the energy storage circuit 20 includes an energy storage unit 102 connected to the rectifier circuit 10. The energy storage unit 102 includes multiple series-connected energy storage groups 1021. The energy storage group 1021 includes a battery pack and power modules connected to both ends of the battery pack, and a controller is connected to the power modules. As shown in Figure 2b, in some embodiments, the connection points A1 and A2 of the power modules of each energy storage group 1021 can be the input and output terminals of the power modules, respectively. The power modules of each energy storage group 1021 are connected in series via their input and output terminals to form multiple series-connected energy storage groups 1021. For example, the battery pack can include at least one battery cell, and the power module can be a half-bridge power module or a full-bridge power module. The energy storage unit 102 can output a voltage greater than 500V, meaning that the energy storage unit can meet the ice-melting requirements of high-voltage lines above 500V. Because the energy storage unit 102 is composed of a series-connected energy storage group 1021 consisting of a battery pack and power modules, in addition to switching the charge and discharge states of the energy storage circuit 20 by adjusting the power modules in the energy storage group 1021, the output voltage of the entire energy storage unit 102 can also be adjusted to adapt to the ice-melting voltage required by the transmission line 30 during ice-melting, thereby improving the reliability and ice-melting efficiency of the ice-melting equipment. For example, by controlling the conduction mode of the power modules through a controller, the operating state of the energy storage group 1021 can be controlled, thereby adjusting the output voltage of the energy storage unit. For example, NLM modulation, carrier phase-shift modulation, or a combination of the two can be used to control the power modules of each energy storage group to achieve continuous adjustment of the voltage of the energy storage circuit from 0 to a maximum value, thereby controlling the current output by the energy storage circuit. Alternatively, as shown in FIG2 b , a power switch K can be connected between the input and output terminals of the power module. The power switch K can be an isolating switch, a circuit breaker, or a relay. Thus, when the energy storage group 1021 needs to supply power, the controller can disconnect the power switch K and control the power module of the energy storage group 1021 to control the battery pack of the energy storage group 1021 to supply power. When the energy storage group 1021 is no longer needed to supply power, the power switch K of the energy storage group 1021 can be closed to short-circuit the energy storage group 1021, thereby adjusting the output voltage of the energy storage unit.

[0069] In order to enable the ice melting equipment to meet more ice melting needs, in some embodiments, as shown in Figure 3, the rectifier circuit 10 includes a rectifier unit 100 and a first switch unit, the first end of the first switch unit is connected to the rectifier unit 100, the second end of the first switch unit is connected to the energy storage circuit 20, and the second end of the first switch unit is connected to the transmission line 30; the controller is connected to the first switch unit.

[0070] The first switch unit may include a first power switch S1, which may be an isolating switch, a circuit breaker, or a relay. A first end of the first power switch S1 is connected to a first end of the rectifier unit 100, a second end of the first power switch S1 is connected to a first end of the energy storage circuit 20, and a second end of the first power switch S1 is connected to one end of the transmission line 30. Alternatively, a first end of the first power switch S1 is connected to a second end of the rectifier unit 100, a second end of the first power switch S1 is connected to a second end of the energy storage circuit 20, and a second end of the first power switch S1 is connected to the other end of the transmission line 30. The first end of the rectifier unit 100 may be a DC output end of the rectifier unit 100, and the second end of the rectifier unit 100 may be a DC input end of the rectifier unit 100.

[0071] In some embodiments, the rectifier unit 100 may be a rectifier connected to a power grid to convert AC power input from the power grid into DC power. For example, the rectifier unit 100 may be a VSC (Voltage Source Converter) valve group, which may have a two-level or three-level PWM rectifier topology, or may be composed of an MMC (Modular Multilevel Converter). Since the rectifier unit 100 is a multilevel converter, the controller may be used to adjust the multilevel converter in the rectifier unit 100 to adjust the output voltage of the entire rectifier unit 100 so that it can adapt to the ice-melting voltage required by the transmission line 30 during ice melting, or to the charging voltage required by the energy storage circuit 20 during charging.

[0072] In some embodiments, when the AC input of the rectifier circuit 10 is connected to the grid, and the rectifier circuit 10 and the energy storage circuit 20 are connected in parallel to the transmission line 30, a controller can be used to adjust the on / off state of the first switch unit, as well as the charge / discharge state of the energy storage circuit, to achieve different ice-melting methods. For example, the first switch unit can be disconnected, and the energy storage unit 102 can be switched to a discharge state. At this time, the energy storage unit 102 and the transmission line 30 form a loop, thereby utilizing the electrical energy stored in the energy storage unit 102 to power the transmission line 30, causing the transmission line 30 to generate heat, thereby achieving ice-melting. In this way, when ice-melting is required for a short period of time on a short transmission line, the ice can be melted solely by the energy storage unit 102, without using the electricity provided by the grid. This improves the ice-melting efficiency of the transmission line while conserving the grid's power resources.

[0073] Alternatively, the controller may control the first switch unit to close, and at the same time the energy storage unit 102 is switched to a charging state. At this time, the rectifier circuit 10 is equivalent to a main circuit, and the energy storage circuit 20 and the transmission line are equivalent to branches. Thus, when the rectifier circuit 10 is running, the DC power output by the rectifier unit 100 can be used to power the transmission line 30, so that the transmission line 30 is heated to melt ice. At the same time, the DC power output by the rectifier unit 100 can be used to charge the energy storage circuit 20, thereby simultaneously meeting the needs of melting ice on the transmission line and charging the energy storage circuit.

[0074] Alternatively, when the output voltages of the rectifier unit 100 and the energy storage unit 102 are the same, the first switch unit can be closed and the energy storage unit 102 can be switched to a discharge state. At this time, the rectifier circuit 10 and the energy storage circuit 20 are equivalent to two parallel power supplies, so that the direct current output by the rectifier unit 100 and the energy storage unit 102 can be used to power the transmission line 30, so that the transmission line 30 can be heated to achieve ice melting.

[0075] By arranging a rectifier unit and a first switch unit in the rectifier circuit, when long-term ice melting is required or the line requiring ice melting is long, the first switch unit can be controlled to be closed to select the energy provided by the power grid to melt the ice for the transmission line; when short-term ice melting is required for a transmission line, the first switch unit can be controlled to be disconnected to select the energy provided by the energy storage circuit to melt the ice for the transmission line, thereby meeting different ice melting requirements of the transmission line and improving the ice melting efficiency of the transmission line.

[0076] To improve the reliability of the ice-melting equipment, in some embodiments, as shown in FIG4 , the first switch unit includes a first power switch S1 and a second power switch S2. The first power switch S1 has a first end connected to the first end of the rectifier unit 100, a second end connected to the first end of the energy tank circuit 20, and a second end connected to one end of the transmission line 30. The second power switch S2 has a first end connected to the second end of the rectifier unit 100, a second end connected to the second end of the energy tank circuit 20, and a second end connected to the other end of the transmission line 30. The first power switch S1 and the second power switch S2 can each be an isolating switch, a circuit breaker, or a relay. A controller is connected to the first power switch S1 and the second power switch S2.

[0077] Since the first power switch S1 and the second power switch S2 are respectively connected to the two ends of the rectifier unit 100, when the rectifier circuit 10 is no longer needed to supply energy, the controller can simultaneously disconnect the first power switch S1 and the second power switch S2 to completely disconnect the rectifier circuit 10, thereby avoiding the situation where a switch is stuck and the rectifier circuit cannot be disconnected, thereby improving the reliability of the ice melting equipment.

[0078] To further enable the ice-melting device to meet a wider range of ice-melting needs, in some embodiments, as shown in FIG5 , the energy storage circuit 20 includes an energy storage unit 102 and a second switch unit. The first end of the second switch unit is connected to the energy storage unit 102, the second end of the second switch unit is connected to the rectifier circuit 10, and the second end of the second switch unit is connected to the transmission line 30. A controller is connected to the second switch unit. The second switch unit may include a first switch S3. The first switch S3 may be an isolating switch, a circuit breaker, or a relay. The first end of the first switch S3 is connected to the first end of the energy storage unit 102, the second end of the first switch S3 is connected to the first end of the rectifier circuit 10, and the second end of the first switch S3 is connected to one end of the transmission line 30. Alternatively, the first end of the first switch S3 is connected to the second end of the rectifier unit 100, the second end of the first switch S3 is connected to the second end of the rectifier circuit 10, and the second end of the first power switch S1 is connected to the other end of the transmission line 30.

[0079] In some embodiments, when the AC input of the rectifier circuit 10 is connected to the power grid, and the rectifier circuit 10 and the energy storage circuit 20 are connected in parallel to the transmission line 30, different ice-melting modes can be achieved by adjusting the on / off state of the second switch unit and the charge / discharge state of the energy storage circuit 20. For example, the controller can control the second switch unit to be disconnected, at which point the rectifier circuit 10 and the transmission line 30 form a loop. After the rectifier circuit 10 converts the AC power from the power grid into DC power, the DC power output by the rectifier circuit 10 is used to power the transmission line 30, causing it to heat and thereby melt the ice. In this way, if the transmission line is long or ice-melting takes a long time, the second switch unit can be disconnected to allow the rectifier unit 100 to melt the ice on the transmission line 30, thereby improving the ice-melting efficiency of the transmission line.

[0080] Alternatively, the second switch unit can be closed and the energy storage unit 102 can be switched to the charging state. At this time, the rectifier circuit 10 is equivalent to the main circuit, and the energy storage circuit 20 and the transmission line are equivalent to the branch circuit. Therefore, the DC power output by the rectifier unit 100 can be used to power the transmission line 30 to make the transmission line 30 heat up to achieve ice melting. At the same time, the DC power output by the rectifier circuit 10 can also be used to charge the energy storage circuit 20, thereby meeting the needs of ice melting on the transmission line and charging the energy storage circuit at the same time.

[0081] Alternatively, the second switch unit can be closed, and the energy storage unit 102 can be switched to a discharge state. In this case, the rectifier circuit 10 and the energy storage circuit 20 act as two parallel power supplies. The DC power output by the rectifier circuit 10 and the energy storage unit 102 can be used to power the transmission line 30, thereby generating heat to melt ice. In this way, by switching the second switch unit provided in the energy storage circuit, various ice-melting requirements can be met.

[0082] To further improve the reliability of the ice-melting device, as shown in FIG6 , in some embodiments, the second switch unit includes a first switch S3 and a second switch S4 . A first end of the first switch S3 is connected to a first end of the energy storage unit 102 , a second end of the first switch S3 is connected to a first end of the rectifier circuit 10 , and a second end of the first switch S3 is connected to one end of the transmission line 30 . A first end of the second switch S4 is connected to a second end of the energy storage unit 102 , a second end of the second switch S4 is connected to a second end of the rectifier circuit 10 , and a second end of the second switch S4 is connected to the other end of the transmission line 30 . A controller is connected to the first switch S3 and the second switch S4 .

[0083] As a possible implementation, a first end of the first switch S3 is connected to a first end of the rectifier unit 100, a first end of the first switch S3 is connected to one end of the transmission line 30, and a second end of the first switch S3 is connected to the energy storage unit 102. A first end of the second switch S4 is connected to the energy storage unit 102, a second end of the second switch S4 is connected to the second end of the first switch unit whose first end is connected to the rectifier unit 100, and a second end of the second switch S4 is connected to the second end of the first switch unit and the other end of the transmission line.

[0084] As another possible implementation, a first end of the first switch S3 is connected to the second end of the first switch unit, whose first end is connected to the rectifier unit 100. The first end of the first switch S3 is connected to one end of the transmission line 30, and the second end of the first switch S3 is connected to the energy storage unit 102. A first end of the second switch S4 is connected to the energy storage unit 102, a second end of the second switch S4 is connected to the second end of the rectifier unit 100, and the second end of the second switch S4 is connected to the second end of the rectifier unit 100 and the other end of the transmission line.

[0085] In another possible implementation, a first end of the first switch S3 is connected to the second end of the first power switch S1, whose first end is connected to the rectifier unit 100. The first end of the first switch S3 is connected to one end of the transmission line 30, and the second end of the first switch S3 is connected to the energy storage unit 102. A first end of the second switch S4 is connected to the energy storage unit 102, and a second end of the second switch S4 is connected to the second end of the second power switch S2, whose first end is connected to the rectifier unit 100. The second end of the second switch S4 and the second end of the second power switch S2 are connected to the other end of the transmission line.

[0086] Since the first switching switch S3 and the second switching switch S4 are respectively connected to the two ends of the energy storage unit 102, when the energy storage circuit 20 is not needed to supply energy, the first switching switch S3 and the second switching switch S4 can be disconnected at the same time by the controller to completely disconnect the energy storage circuit, thereby avoiding the situation where a switch is stuck and the energy storage circuit cannot be disconnected, thereby improving the reliability of the ice melting equipment.

[0087] To further improve the reliability of the ice melting device, in some embodiments, as shown in FIG6 , the energy storage circuit 102 further includes a reactor L;

[0088] The reactor L is provided between the energy storage unit 102 and the rectifier circuit 10 .

[0089] Exemplarily, the first end of the reactor L is connected to the first end of the rectifier circuit 10, and the second end of the reactor L is connected to the first end of the energy storage unit 102. Alternatively, the first end of the reactor L is connected to the first end of the rectifier circuit 10 via the first switch S3, and the second end of the reactor L is connected to the first end of the energy storage unit 102. Alternatively, the first end of the reactor L is connected to the first end of the rectifier circuit 10, and the second end of the reactor L is connected to the first end of the energy storage unit 102 via the first switch S3. The reactor L can be an inductor to filter the current input to the energy storage unit 102 to suppress surges and harmonic currents, thereby improving the safety of the energy storage circuit and further enhancing the reliability of the ice melting device.

[0090] In order to enable the ice-melting device to meet more energy supply demands, in some embodiments, as shown in FIG7 , the ice-melting device further includes a third switch unit; the third switch unit is provided between the energy storage circuit 20 and the transmission line 30; and the controller is connected to the third switch unit. The third switch unit may include a first ice-melting switch S5. The ice-melting switch may be an isolating switch, a circuit breaker, or a relay, etc. The first end of the first ice-melting switch S5 is connected to the first end of the rectifier circuit 10 and the first end of the energy storage circuit 20, and the second end of the first ice-melting switch S5 is connected to one end of the transmission line 30. Alternatively, the first end of the first ice-melting switch S5 is connected to the second end of the rectifier circuit 10 and the second end of the energy storage circuit 20, and the second end of the first ice-melting switch S5 is connected to the other end of the transmission line 30.

[0091] In some embodiments, the controller can disconnect the third switch unit to disconnect the circuit between the power transmission line 30 and the rectifier circuit 10 and the energy storage circuit 20, thereby stopping the power transmission line 30 or the rectifier circuit 10 from supplying energy to the power transmission line 30. In this way, when de-icing is not required on the power transmission line, the power supply to the power transmission line can be stopped by disconnecting the third switch unit, without disconnecting the switch units of the rectifier circuit and the energy storage circuit, thereby improving the operating efficiency of the de-icing device.

[0092] In addition, the third switch unit can be disconnected and the first switch unit and the second switch unit can be closed at the same time, so that the energy storage circuit can be charged separately by the power grid connected by the rectifier circuit without the need to melt the ice on the transmission line, or the energy storage circuit can supply power to the power grid connected by the rectifier circuit, thereby enabling the ice melting equipment to meet more energy supply needs and improve the utilization rate of the equipment.

[0093] In some embodiments, as shown in FIG8 , the third switch unit includes a first ice-melting switch S5 and a second ice-melting switch S6 ;

[0094] A first end of the first ice-melting switch S5 is connected to a first end of the rectifier circuit 10 and a first end of the energy storage circuit 20 , and a second end of the first ice-melting switch S5 is connected to one end of the power transmission line 30 ;

[0095] A first end of the second ice-melting switch S6 is connected to a second end of the rectifier circuit 10 and a second end of the energy storage circuit 20, and a second end of the second ice-melting switch S6 is connected to the other end of the power transmission line 30. A controller is connected to the first ice-melting switch S5 and the second ice-melting switch S6.

[0096] Since the first ice-melting switch S5 and the second ice-melting switch S6 are respectively provided at both ends for accessing the transmission line 30, when it is not necessary to melt the ice on the transmission line, the first ice-melting switch S5 and the second ice-melting switch S6 can be disconnected at the same time to completely disconnect the ice-melting equipment from the transmission line, thereby avoiding the situation where a certain ice-melting switch is stuck and the transmission line cannot be disconnected, thereby further improving the reliability of the ice-melting equipment.

[0097] In some embodiments, the transmission line 30 can be a direct current (DC) transmission line or a three-phase alternating current (AC) transmission line. If the transmission line 30 requiring ice melting is a three-phase AC transmission line, the ice melting equipment is connected to the headends of phases A, B, and C of the three-phase AC transmission line, respectively, and the ends of phases A, B, and C are short-circuited. In this case, when ice is melted on the three-phase AC transmission line, energy is supplied to phases A, B, and C simultaneously.

[0098] However, considering that not every phase of the ABC three-phase line may need to be de-iced, in order to be able to flexibly de-ice the three-phase AC power transmission line, in some embodiments, as shown in FIG9 , the de-icing device further includes a first phase line switch S7, a second phase line switch S8, a third phase line switch S9, and a fourth phase line switch S10; the first ends of the first phase line switch S7 and the second phase line switch S8 are connected to the first end of the energy storage circuit 20; the second end of the second phase line switch S8 is connected to the first end of the third phase line switch S9, and the second end of the third phase line switch S9 is connected to the second end of the energy storage circuit 20 and the first end of the fourth phase line switch S10; the second end of the first phase line switch S7 is connected to the first phase line of the transmission line 30, the second end of the second phase line switch S8 and the second end of the third phase line switch S9 are connected to the second phase line of the transmission line 30, and the second end of the fourth phase line switch S10 is connected to the third phase line of the transmission line 30.

[0099] Exemplarily, a first end of the first phase switch S7 and a first end of the second phase switch S8 are connected to one end of the energy tank circuit 20 via a third switch unit, and a second end of the first phase switch S7 is connected to the A-phase line. A second end of the second phase switch S8 is connected to the first end of the third phase switch S9, and a second end of the second phase switch S8 is connected to the B-phase line. A second end of the third phase switch S9 is connected to the other end of the energy tank circuit 20 and a first end of the fourth phase switch S10, and a second end of the fourth phase switch S10 is connected to the C-phase line.

[0100] Alternatively, the first end of the first phase switch S7 and the first end of the second phase switch S8 are connected to one end of the energy storage circuit 20 via the first ice-melting switch S5, and the second end of the first phase switch S7 is connected to the phase A line. The second end of the second phase switch S8 is connected to the first end of the third phase switch S9, and the second end of the second phase switch S8 is connected to the phase B line. The second end of the third phase switch S9 is connected to the other end of the energy storage circuit 20 via the second ice-melting switch S6. The first end of the fourth phase switch S10 is connected to the second end of the third phase switch S9, and the second end of the fourth phase switch S10 is connected to the phase C line.

[0101] In this way, by switching the first phase line switch S7, the second phase line switch S8, the third phase line switch S9 and the fourth phase line switch S10, multiple ice melting modes such as AB phase line ice melting, BC phase ice melting, A-BC ice melting and AB-C ice melting can be achieved, thereby improving the flexibility of ice melting.

[0102] For example, as shown in FIG10 , an ice melting device is provided, including a rectifier unit 100 , an energy storage unit 102 , a first power supply switch S1 , a second power supply switch S2 , a first switching switch S3 , a second switching switch S4 , a reactor L , a first ice melting switch S5 , a second ice melting switch S6 , a first phase line switch S7 , a second phase line switch S8 , a third phase line switch S9 and a fourth phase line switch S10 .

[0103] The AC input end of the rectifier unit 100 is connected to the power grid. The first end of the rectifier unit 100 is connected to the first end of the first power switch S1, and the second end of the rectifier unit 100 is connected to the first end of the second power switch S2. The second end of the first power switch S1 is connected to the first end of the first transfer switch S3 and the first end of the first ice-melting switch S5. The second end of the first transfer switch S3 is connected to the first end of the reactor L, and the second end of the reactor L is connected to the first end of the energy storage unit 102. The second end of the energy storage unit 102 is connected to the first end of the second transfer switch S4, and the second end of the second transfer switch S4 is connected to the second end of the second power switch S2 and the first end of the second ice-melting switch S6. The second end of the first ice-melting switch S5 is connected to the first end of the first phase switch S7 and the first end of the second phase switch S8. The second end of the second phase switch S8 is connected to the first end of the third phase switch S9, and the second end of the third phase switch S9 is connected to the second end of the second ice-melting switch S6 and the first end of the fourth phase switch S10. The second end of the first phase line switch S7 is connected to the A phase line, the second end of the second phase line switch S8 and the second end of the third phase line switch S9 are connected to the B phase line, and the second end of the fourth phase line switch S10 is connected to the C phase line.

[0104] When de-icing a transmission line, the power supply provided by the energy storage unit 102 can be used to de-ice the corresponding line by opening S1 and S2, closing S3-S6, switching the energy storage unit 102 to a discharge state, and selectively closing at least one of S7-10. Alternatively, the power supply provided by the rectifier unit 100 can be used to de-icer the corresponding line by closing S1, S2, S5, and S6, and selectively closing at least one of S7-10. Alternatively, the power supply provided by the rectifier unit 100 and the energy storage unit 102 can be used to de-icer the corresponding line by closing S1-S6, switching the energy storage unit 102 to a discharge state, and selectively closing at least one of S7-10.

[0105] When it is necessary to melt ice on the transmission line and charge the energy storage unit 102, S1-S6 can be closed, the energy storage unit 102 can be switched to the charging state at the same time, and at least one of S7-10 can be closed to melt ice on the corresponding line and charge the energy storage unit 102 using the electric energy provided by the rectifier unit 100.

[0106] Among them, selecting to close at least one of S7-10 may be closing S7 and S9, and opening S8 and S10 to achieve ice melting of the AB phase line; or, closing S8 and S10, and opening S7 and S9 to achieve ice melting of the BC phase line; or, closing S7, S9 and S10 to achieve ice melting between A and BC; or, closing S7, S8 and S10 to achieve ice melting between AB and C.

[0107] If the transmission line does not need to be de-iced, S1-S4 can be closed, the energy storage unit can be switched to a charging state, and S5 and S6 can be opened to charge the energy storage unit 102 through the grid connected to the rectifier unit 100. Alternatively, S1-S4 can be closed, the energy storage unit can be switched to a discharging state, and S5 and S6 can be opened to power the grid connected to the rectifier unit 100 through the energy storage unit 102.

[0108] FIG8 is a flow chart illustrating a control method for an ice-melting device according to an embodiment of the present application. This control method is applicable to the ice-melting device described in any of the above embodiments, wherein the ice-melting device is connected to the power grid via the third terminal of the rectifier circuit. Specifically, it can be applied to the controller described in any of the above embodiments. In some embodiments, this control method includes:

[0109] S101, obtaining ice melting requirements of transmission lines;

[0110] S102: When there is a need to melt ice on the transmission line, control at least one of the rectifier circuit or the energy storage circuit to switch to a melting state to provide current to the transmission line; or, when there is no need to melt ice on the transmission line, control the rectifier circuit and the energy storage circuit to switch to an energy storage state to provide power consumption to the power grid.

[0111] In some embodiments, the ice melting requirement of the transmission line 30 can be determined based on the current temperature detection result of the transmission line 30, the current line image detection result of the transmission line 30, or whether a request for ice melting has been received for the transmission line 30. If the temperature of the transmission line 30 is detected to be lower than a preset value, it indicates that the transmission line 30 needs to melt ice; otherwise, it indicates that the transmission line 30 does not need to melt ice. Alternatively, if ice is detected on the transmission line from the current line image, it indicates that the transmission line 30 needs to melt ice; otherwise, it indicates that the transmission line 30 does not need to melt ice. Alternatively, the controller can monitor ice parameters of the transmission line and compare the ice parameters with ice threshold parameters to determine the ice melting requirement of the transmission line. The ice parameters can include the pressure, temperature, ice area, or ice volume of the transmission line. The pressure can be determined by a pressure sensor installed on the transmission line 30, and the temperature can be determined by a temperature sensor used to detect the ambient temperature of the transmission line 30. The ice coverage area or ice coverage amount can be determined by performing image recognition on the current line image of the transmission line 30. The ice coverage threshold parameter can be set according to the actual situation. For example, through a large number of experiments, the critical value of the ice coverage area that affects the power transmission of the transmission line can be used as the ice coverage threshold parameter. After obtaining the ice coverage parameter, the ice coverage parameter is compared with the ice coverage threshold parameter. If the ice coverage parameter is greater than the ice coverage threshold, it means that there is a need for ice melting on the transmission line 30; otherwise, it means that there is no need for ice melting on the transmission line 30. Alternatively, if the controller receives an ice melting request for melting the ice on the transmission line 30, it can be indicated that there is a need for ice melting on the transmission line 30. By judging the ice melting demand of the transmission line in a variety of ways, the ice melting equipment can meet different ice melting scenarios and improve ice melting reliability.

[0112] As a possible implementation, if there is a need to melt ice on the transmission line 30, the controller can control at least one of the rectifier circuit or the energy storage circuit to switch to an ice-melting state, thereby supplying current to the transmission line. For example, the controller can control the multilevel converter in the rectifier circuit 10 to switch the rectifier circuit to a rectification mode, thereby supplying current to the transmission line 30 via the power grid to which the rectifier circuit 10 is connected. Furthermore, the controller can control the energy storage circuit 20 to switch to a discharge state, such as by controlling the energy storage module in the energy storage circuit 20 to switch the energy storage circuit 20 to a discharge state, thereby supplying current to the transmission line 30. When controlling the energy storage circuit 20 as the source of electrical energy, NLM modulation, carrier phase shift modulation, or a combination of the two can be used to control the energy storage circuit 20, thereby achieving continuous adjustment of the voltage of the energy storage circuit 20 from 0 to a maximum value, thereby controlling the current output by the energy storage circuit.

[0113] Alternatively, if there is a need to melt ice on the transmission line 30, the output voltages of the rectifier circuit 10 and the energy storage circuit 20 can be obtained and compared. If the output voltages of the two are the same, the rectifier circuit 10 can be controlled to receive AC power from the grid for rectification, while the energy storage circuit 20 can be controlled to operate. For example, the energy storage circuit 20 can be closed and switched to a discharge state. At this time, the rectifier circuit and the energy storage circuit are simultaneously switched to the ice-melting state, so that the grid connected to the rectifier circuit 10 and the energy storage circuit 20 jointly provide current to the transmission line 30.

[0114] Alternatively, if the transmission line 30 requires ice melting, the energy storage circuit 20 may first be checked for charging. For example, the current charge level of the energy storage circuit 20 may be checked to see if it is below a preset value, which may be set based on actual conditions, such as 20%. If so, the energy storage circuit 20 may be controlled to switch to an energy storage state, i.e., a charging state, while the rectifier circuit 10 is simultaneously controlled to turn on, i.e., switch the rectifier circuit 10 to an ice melting state, thereby providing current to the energy storage circuit 20 and the transmission line 30 via the power grid connected to the rectifier circuit 10. This allows the energy storage circuit 20 to be charged while simultaneously melting the ice on the transmission line 30.

[0115] As another possible implementation, if there is no ice melting demand on the transmission line 30, the controller can control the rectifier circuit 10 and the energy storage circuit 20 to switch to the energy storage state, that is, control the rectifier circuit 10 to start the rectification mode and control the energy storage circuit 20 to switch to the charging state, so that the grid connected to the rectifier circuit 10 can supply current to the energy storage circuit 20 and provide power to the grid. When controlling the rectifier circuit 10 to supply current to the energy storage circuit 20, the duty cycle of the pulse signal of the rectifier circuit 20 can be adjusted according to the charging demand of the energy storage current to adjust the output current of the rectifier circuit 20.

[0116] Among them, since the rectifier circuit 10 can include a two-level or three-level PWM rectifier topology structure, and can also include an MMC (Modular Multilevel Converter), when controlling the output current of the rectifier circuit 10, the duty cycle of the pulse signal of the rectifier circuit 20 can be adjusted according to the de-icing requirement of the transmission line 30 and / or the charging requirement of the energy storage circuit 20 to adjust the output voltage of the rectifier circuit 10 so that it meets the voltage requirement for de-icing the transmission line 30 and the charging requirement of the energy storage circuit 20.

[0117] As another possible implementation, if there is no ice melting demand on the transmission line 30, the controller may control the energy storage circuit 20 to switch to a discharge state and control the rectifier circuit 10 to start an inverter mode, thereby controlling the energy storage circuit 20 to supply power to the grid via the rectifier circuit 10. When controlling the energy storage circuit 20 to provide current to the grid, the duty cycle of the pulse signal of the rectifier circuit 20 may also be adjusted according to the charging demand of the grid to adjust the output current of the rectifier circuit 20.

[0118] When a transmission line is detected to require ice melting, at least one of the grid or energy storage circuit connected to the rectifier circuit is controlled to switch to an ice melting state to supply current to the transmission line. When a transmission line is detected to require ice melting, the rectifier circuit and the energy storage circuit are controlled to switch to an energy storage state to provide power to the grid. Thus, when ice melting is not required, the rectifier circuit and the energy storage circuit can be controlled to switch to an energy storage state to store energy, thus preventing the ice melting equipment from being out of service for long periods of time. This improves the utilization rate of the ice melting equipment and allows for the timely detection of any anomalies in the ice melting equipment. Furthermore, when ice melting is required, either the grid or the energy storage circuit connected to the rectifier circuit can be controlled to melt the transmission line, thereby meeting ice melting requirements in different situations and improving ice melting efficiency.

[0119] To further improve the ice melting efficiency, in some embodiments, when there is a need to melt ice on the transmission line, at least one of the rectifier circuit or the energy storage circuit is controlled to switch to the ice melting state to provide current to the transmission line, including: when there is a need to melt ice on the transmission line, at least one of the first switch unit of the rectifier circuit or the second switch unit of the energy storage circuit is controlled to be closed to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line.

[0120] In some embodiments, when it is determined that there is a need to melt ice on the transmission line 30, the controller can control the first switch unit of the rectifier circuit 10 to close, and at the same time turn on the rectification mode of the rectifier circuit 10, and the second switch unit of the energy storage circuit 20 to be disconnected, and the rectifier circuit 10 is switched to the ice melting state. At this time, the power grid connected to the rectifier circuit 10 provides current to the transmission line 30.

[0121] As another possible implementation, if the controller receives a request to melt ice on the transmission line 30, it can control the first switch unit to open, the second switch unit to close, and simultaneously control the energy storage circuit 20 to switch to a discharge state. At this time, the energy storage circuit 20 switches to a melting state, and the energy storage circuit 20 provides current to the transmission line 30. When controlling the energy storage circuit 20 as the object of providing electric energy, NLM modulation, carrier phase shift modulation, or a combination of the two can be used to control the energy storage circuit 20, so as to achieve continuous adjustment of the voltage of the energy storage circuit 20 from 0 to a maximum value, thereby controlling the current output by the energy storage circuit 20.

[0122] As another possible implementation, if the controller receives a request to melt ice on a transmission line, it can first obtain the output voltages of the rectifier circuit 10 and the energy storage circuit 20 for comparison. If the output voltages are the same, the first and second switch units can be controlled to close, and the energy storage circuit 20 can be controlled to switch to a discharge state. At this time, the rectifier circuit 10 and the energy storage circuit 20 can be switched to a melting state, and the rectifier circuit 10 and the energy storage circuit 20 can jointly provide current to the transmission line 30. It will be understood that when providing current to the transmission line 30, the rectifier circuit 10 operates in a rectification mode.

[0123] When it is detected that there is a need to melt ice on the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed, so that at least one of the power grid or the energy storage circuit connected to the rectifier circuit provides current to the transmission line, thereby effectively controlling the ice melting of the ice melting equipment and improving the ice melting efficiency of the ice melting equipment.

[0124] In order to more accurately trigger the ice melting device to melt ice, in some embodiments, at least one of the first switch unit of the rectifier circuit or the second switch unit of the energy storage circuit is controlled to be closed so that at least one of the rectifier circuit or the energy storage circuit provides current to the transmission line, including: in response to the closure of the third switch unit, controlling at least one of the first switch unit or the second switch unit to be closed to control the power grid connected to the rectifier circuit or at least one of the energy storage circuit to provide current to the transmission line; wherein the third switch unit is arranged between the energy storage circuit and the transmission line.

[0125] In some embodiments, the controller may be connected to the third switch unit to detect the on / off state of the third switch unit. If the controller detects that the third switch unit is open, it indicates that ice melting is not required for the transmission line, and current may be supplied to the transmission line. If the controller detects that the third switch unit is closed, it indicates that ice melting is required for the transmission line. In this case, the controller interprets the detection of the third switch unit being closed as a request for ice melting. In response to this request, the controller controls at least one of the first switch unit or the second switch unit to be closed, so that at least one of the grid connected to the rectifier circuit 10 or the energy storage circuit 20 supplies current to the transmission line 30.

[0126] By controlling at least one of the first switch unit or the second switch unit to be closed when the third switch unit is closed, at least one of the power grid or the energy storage circuit connected to the rectifier circuit provides current to the transmission line, thereby avoiding the situation where the transmission line cannot be powered due to the disconnection of the third switch unit after at least one of the first switch unit or the second switch unit is triggered to be closed, thereby reducing ineffective control of the first switch unit or the second switch unit, and more accurately triggering the ice melting equipment to melt ice.

[0127] To further improve the de-icing efficiency of the transmission line, in some embodiments, at least one of the first switch unit or the second switch unit is controlled to be closed to control at least one of the power grid or the energy storage circuit connected to the rectifier circuit to provide current to the transmission line, including: according to de-icing demand information of the transmission line, controlling at least one of the first switch unit or the second switch unit to be closed to control at least one of the power grid or the energy storage circuit connected to the rectifier circuit to provide current to the transmission line; wherein the de-icing demand information includes at least one of the de-icing voltage, de-icing current or de-icing time required for the transmission line to complete de-icing.

[0128] In some embodiments, ice-melting requirement information can be determined through manual input. Alternatively, ice-melting requirement information can be determined based on at least one of the line parameters of the transmission line or the environmental parameters of the environment in which it is located. Line parameters include, for example, the length and resistance of the transmission line, and environmental parameters include, for example, temperature and wind speed. Line parameters can be pre-stored in the controller when the transmission line is connected, and environmental parameters can be acquired via sensors for detecting environmental parameters of the transmission line, such as a temperature sensor or a wind speed sensor. For example, a pre-set correspondence between at least one of the line parameters or environmental parameters and ice-melting requirement information can be established. For example, if the length is L1, the ice-melting requirement information can be ice-melting voltage U1, ice-melting current A1, and ice-melting time T1; or if the length is L1 and the resistance is R1, the ice-melting requirement information can be ice-melting voltage U1, ice-melting current A1, and ice-melting time T1; or if the length is L1, the resistance is R1, the temperature is K1, and the wind speed is Nm / s, the ice-melting requirement information can be ice-melting voltage U1, ice-melting current A1, and ice-melting time T1. The specific correspondence can be set based on actual needs.

[0129] In some embodiments, after determining the ice-melting requirement information for a transmission line, the values ​​of the various parameters in the ice-melting requirement information can be used to control the first switch unit, the second switch unit, and the energy storage unit. For example, assuming the ice-melting requirement information includes ice-melting voltage, ice-melting current, and ice-melting duration, the ice-melting voltage can be compared with a preset voltage, the ice-melting current can be compared with a preset current, and the ice-melting duration can be compared with a preset duration. If the ice-melting voltage, ice-melting current, and ice-melting duration are all greater than their corresponding preset values, it indicates that the transmission line 30 requires a large amount of energy. In this case, the first and second switch units are closed, and the energy storage circuit 20 is controlled to switch to a discharge state, so that the grid connected to the rectifier circuit 10 and the energy storage circuit 20 jointly provide current to the transmission line 30. If one or both of the ice-melting voltage, ice-melting current, or ice-melting duration are greater than the preset values, the first switch unit is closed and the second switch unit is opened, so that the grid connected to the rectifier circuit 10 can provide current to the transmission line 30. If the ice-melting voltage, ice-melting current, and ice-melting time are all less than or equal to their corresponding preset values, it means that the power transmission line 30 requires less energy. In this case, the first switch unit can be opened, the second switch unit can be closed, and the energy storage circuit 20 can be controlled to switch to the discharge state to provide current to the transmission line 30 through the energy storage circuit 20. The preset voltage, preset current, and preset time can be determined based on the current maximum discharge voltage, maximum discharge current, and discharge time at the maximum discharge current of the energy storage circuit 20.

[0130] When it is detected that there is a need for ice melting on the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed based on the ice melting demand information of the transmission line, so that at least one of the power grid or the energy storage circuit connected to the rectifier circuit provides current to the transmission line, thereby making the ice melting of the transmission line more in line with actual needs and improving the ice melting efficiency of the transmission line.

[0131] In order to improve the safety of ice melting while improving the power resource utilization of the ice melting equipment, in some embodiments, based on the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed to control at least one of the power grid or the energy storage circuit connected to the rectifier circuit to provide current to the transmission line, including: determining that the ice melting voltage is less than the operating voltage of the rectifier circuit, controlling the first switch unit to be disconnected, the second switch unit to be closed, and switching the energy storage circuit to a discharge state to control the energy storage circuit to provide current to the transmission line.

[0132] In some embodiments, after obtaining ice-melting demand information, the ice-melting voltage in the ice-melting demand information can be compared with the operating voltage of the rectifier circuit 10. The operating voltage of the rectifier circuit 10 can be the minimum DC voltage during the operation of the rectifier unit 100 of the rectifier circuit 10. If the ice-melting voltage is lower than the operating voltage of the rectifier circuit 10, this indicates that using the rectifier circuit 10 for ice melting may result in a waste of power resources due to the operating voltage of the rectifier circuit 10 being higher than the ice-melting voltage. This may also cause the transmission line 30 to overheat, impacting its safety. In this case, the first switch unit can be controlled to open, the second switch unit closed, and the energy storage circuit 20 switched to a discharge state, thereby supplying energy to the transmission line 30 through the energy storage circuit 20. This can reduce power resource waste, improve power resource utilization, and enhance the safety of the transmission line. When controlling the energy storage circuit to provide current to the transmission line, the output voltage / output current of the energy storage circuit can be adjusted according to the ice-melting voltage / ice-melting current of the transmission line so that it can adapt to the ice-melting requirements of the energy storage circuit.

[0133] In some embodiments, if the controller determines that the ice-melting voltage reaches the operating voltage of the rectifier circuit 10, the first switch unit can still be controlled to be disconnected, the second switch unit can be closed, and the energy storage circuit 20 can be switched to a discharge state to supply energy to the transmission line 30 through the energy storage circuit 20.

[0134] In order to improve the ice melting efficiency, if the controller determines that the ice melting voltage reaches the operating voltage of the rectifier circuit 10, it means that the rectifier circuit 10 can be used for ice melting. At this time, the first switch unit can be controlled to close to control the power grid connected to the rectifier circuit 10 to supply energy to the transmission line 30, thereby improving the ice melting efficiency of the transmission line.

[0135] In some embodiments, when the first switch unit is controlled to be closed, the second switch unit may be controlled to be open, so that the power grid connected to the rectifier circuit 10 can independently supply energy to the transmission line 30 .

[0136] In order to further improve the utilization rate of electric power resources while improving the ice melting efficiency, in some embodiments, according to the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed to control at least one of the power grid or the energy storage circuit connected to the rectifier circuit to provide current to the transmission line, including: determining that the ice melting voltage reaches the operating voltage of the rectifier circuit and the ice melting current is greater than the rated current of the rectifier circuit, controlling the first switch unit and the second switch unit to be closed, and switching the energy storage circuit to a discharge state to control the power grid and the energy storage circuit connected to the rectifier circuit to provide current to the transmission line.

[0137] For example, if it is determined that the ice-melting voltage is greater than or equal to the operating voltage of the rectifier circuit 10, the ice-melting current in the ice-melting requirement information can be checked to see if it is greater than the rated current of the rectifier circuit 10. If the ice-melting current is less than or equal to the rated current, it indicates that the rectifier circuit 10 can still meet the ice-melting requirement. In this case, the first switch unit can be controlled to close, and the power grid connected to the rectifier circuit 10 can independently supply energy to the transmission line 30. If the ice-melting current is greater than the rated current of the rectifier circuit 10, it indicates that the current output by the rectifier circuit 10 cannot meet the ice-melting requirement. In this case, the first and second switch units can be controlled to close, and the energy storage circuit 20 can be switched to a discharge state, so that the power grid connected to the rectifier circuit 10 and the energy storage circuit 20 can jointly supply energy to the transmission line 30. This can reduce the energy supply pressure on the power grid and improve the utilization rate of power resources.

[0138] In addition to controlling the grid connected to the rectifier circuit 10 and the energy storage circuit 20 to supply energy to the transmission line when it is determined that the ice-melting voltage reaches the operating voltage of the rectifier circuit 10 and the ice-melting current is greater than the rated current of the rectifier circuit 10, in some embodiments, at least one of the first switch unit or the second switch unit is controlled to be closed based on the ice-melting demand information of the transmission line to control at least one of the grid connected to the rectifier circuit or the energy storage circuit to provide current to the transmission line, including: determining that the ice-melting voltage reaches the operating voltage of the rectifier circuit and the discharge time of the energy storage circuit is less than the ice-melting time, controlling the first switch unit and the second switch unit to be closed, and switching the energy storage circuit to a discharge state to control the grid connected to the rectifier circuit and the energy storage circuit to provide current to the transmission line; wherein the discharge time is determined according to the current capacity of the energy storage circuit and the ice-melting current.

[0139] In some embodiments, when it is determined that the ice-melting voltage reaches the operating voltage of the rectifier circuit 10, it is possible to detect whether the discharge time of the energy storage circuit 20 is less than the ice-melting time. The discharge time is determined according to the current capacity of the energy storage circuit 20 and the ice-melting current. If the current capacity is C and the ice-melting current is A, the discharge time T = C / A. If the discharge time of the energy storage circuit 20 is greater than or equal to the ice-melting time, it means that the energy storage circuit 20 can also meet the ice-melting requirements of the transmission line 30 alone. At this time, the first switch unit can be controlled to be disconnected, the second switch unit can be closed, and the energy storage circuit 20 can be controlled to switch to the discharge state, so that the energy storage circuit 20 can be used to supply energy to the transmission line 30 without the need for grid power supply, thereby saving the power resources of the grid. If the discharge duration of the energy storage circuit 20 is shorter than the ice-melting duration, it indicates that the energy storage circuit 20 alone cannot meet the ice-melting needs of the transmission line 30. In this case, the first and second switch units can be controlled to close, and the energy storage circuit 20 can be switched to a discharge state. The grid connected to the rectifier circuit 10 and the energy storage circuit 20 can then be used to jointly supply energy to the transmission line 30. This can reduce the energy supply pressure on the grid and improve the utilization rate of power resources.

[0140] Taking into account that there may be no need for ice melting on the transmission line 30, in order to improve the utilization rate of the equipment, in some embodiments, when there is no need for ice melting on the transmission line, the rectifier circuit and the energy storage circuit are controlled to switch to the energy storage state to provide power consumption to the power grid, including: when there is no need for ice melting on the transmission line, the first switch unit of the rectifier circuit and the second switch unit of the energy storage circuit are controlled to be closed, and the energy storage circuit is switched to the energy storage state, so as to control the power grid connected to the rectifier circuit to supply power to the energy storage circuit.

[0141] In some embodiments, when it is detected that there is no ice melting demand on the transmission line 30, the controller may, based on current demand, for example, the controller may detect the current charge state of the energy storage circuit 20, that is, the current remaining power of the energy storage circuit 20, and control the first switch unit of the rectifier circuit and the second switch unit of the energy storage circuit to be closed according to the detection result, so that the rectifier circuit and the energy storage circuit form a loop, and at the same time control the energy storage circuit 20 to switch to the energy storage state, that is, the charging state, so that when the energy storage circuit 20 switches to the energy storage state, the power grid connected by the rectifier circuit 10 supplies power to the energy storage circuit 20 to provide power consumption to the power grid.

[0142] In some embodiments, when the rectifier circuit 10 is used to charge the energy storage circuit 20, the rectifier circuit 20 can be controlled to charge the energy storage circuit 20 according to the four-quadrant method of electric energy metering to achieve peak regulation, frequency modulation, damped oscillation, and reactive power compensation on the grid side. Alternatively, the power output from the rectifier circuit 10 to the energy storage circuit 20 can be adjusted according to the peak and valley power levels of the grid. For example, when controlling the rectifier circuit 10 to charge the energy storage circuit 20, if the current grid power is peak, the output power of the rectifier circuit 10 is reduced; if the current grid power is valley, the output power of the rectifier circuit 10 is increased.

[0143] The controller responds to a charging request for charging the energy storage unit, controls the first switch unit and the second switch unit to be closed, and switches the energy storage circuit to the energy storage state, so as to control the grid connected to the rectifier circuit to supply power to the energy storage circuit, thereby effectively controlling the charging of the energy storage circuit, thereby improving the utilization rate of the equipment and the charging efficiency of the energy storage circuit.

[0144] In some embodiments, when there is no need to melt ice on the transmission line, the energy storage circuit can be switched to a discharge state to control the energy storage circuit to supply power to the grid to which the rectifier circuit is connected. It will be appreciated that when the energy storage circuit supplies power to the grid to which the rectifier circuit is connected, the rectifier circuit operates in an inverter mode.

[0145] As a possible implementation, upon detecting that there is no ice melting demand on the transmission line 30, the controller may detect the current state of charge of the energy storage circuit 20. If the current state of charge of the energy storage circuit 20 is lower than a first threshold, such as lower than 20%, the controller may interpret the detection of the current state of charge being lower than the first threshold as a charging request. In response to the charging request, the controller controls the first and second switch units to close and switches the energy storage circuit 20 to a charging state, thereby allowing the rectifier circuit 10 to be connected to the power grid to charge the energy storage circuit 20.

[0146] As another possible implementation, when it is detected that there is no ice melting demand on the transmission line 30, the controller may detect the current state of charge of the energy storage circuit 20. When the current state of charge of the energy storage circuit 20 reaches a second threshold, such as 100%, the controller may use the detection signal of the current state of charge reaching the second threshold as a discharge request. In response to the discharge request, the controller controls the first and second switch units to close and switches the energy storage circuit 20 to a discharge state, thereby controlling the energy storage circuit 20 to supply power to the grid via the rectifier circuit 10.

[0147] As another possible embodiment, when it is detected that there is no ice melting demand on the transmission line 30, the controller may detect the current state of charge of the energy storage circuit 20. If the current state of charge of the energy storage circuit 20 is lower than a first threshold, such as lower than 20%, the controller may use the signal of detecting that the current power level is lower than the first threshold as a charging request. In response to the charging request, the controller controls the first switch unit and the second switch unit to close, and switches the energy storage circuit 20 to a charging state, so that the grid connected to the rectifier circuit 10 charges the energy storage circuit 20, until the current state of charge of the energy storage circuit 20 reaches a second threshold, such as 100%. The controller may use the signal of detecting that the current state of charge reaches the second threshold as a discharging request. In response to the discharging request, the controller controls the first switch unit and the second switch unit to close, and switches the energy storage circuit 20 to a discharging state, so that the energy storage circuit 20 supplies power to the grid through the rectifier circuit 10, until the current state of charge of the energy storage circuit 20 is lower than the first threshold. The energy storage circuit 20 is then switched to a charging state, so that the grid connected to the rectifier circuit 10 charges the energy storage circuit 20. The first threshold and the second threshold can be set according to actual conditions, and the first threshold is smaller than the second threshold.

[0148] In order to more accurately trigger the energy storage circuit to consume electricity, in some embodiments, the first switch unit and the second switch unit are controlled to be closed, and the energy storage circuit is switched to a charging state, including: in response to the disconnection of the third switch unit, the first switch unit and the second switch unit are controlled to be closed; wherein the third switch unit is arranged between the energy storage circuit and the transmission line.

[0149] In some embodiments, the controller may be connected to the third switch unit to detect the on / off state of the third switch unit. If the controller detects that the third switch unit is off, it indicates that there is no need to melt ice on the transmission line. In this case, the controller may directly switch to an operating mode for charging the energy storage circuit 20, control the first and second switch units to close, and switch the energy storage circuit 20 to an energy storage state, so that the grid charges the energy storage circuit 20 through the rectifier circuit 10, thereby providing power to the grid.

[0150] By controlling the first and second switch units to close when the third switch unit is disconnected, and switching the energy storage circuit to a charging state, power is provided to the power grid for consumption, thereby avoiding the situation where the transmission line is falsely triggered to melt ice due to the closing of the third switch unit after the first and second switch units are controlled to close when ice melting is not required, thereby improving the safety of charging the energy storage circuit.

[0151] FIG12 shows a schematic structural block diagram of a battery replacement connector detection device provided in an embodiment of the present application. It should be understood that the device corresponds to the method embodiment executed in FIG11 and is capable of executing the steps involved in the aforementioned method. The specific functions of the device can be found in the description above. To avoid repetition, a detailed description is omitted here. The device includes at least one software function module that can be stored in a memory in the form of software or firmware or fixed in the operating system (OS) of the device. Specifically, the device can be applied to the ice melting device in any of the above embodiments, and more specifically, can be applied to the controller of the ice melting device. The device includes: a demand acquisition module 210 for acquiring the ice melting demand of the transmission line; a circuit control module 220 for controlling at least one of the rectifier circuit or the energy storage circuit to switch to the ice melting state and provide current to the transmission line when there is an ice melting demand on the transmission line; or, when there is no ice melting demand on the transmission line, controlling the rectifier circuit and the energy storage circuit to switch to the energy storage state and provide power consumption to the power grid.

[0152] In the technical solution of the embodiment of the present application, when it is detected that the transmission line needs to melt ice, at least one of the grid or energy storage circuit connected to the rectifier circuit is controlled to switch to a melting state to supply current to the transmission line. When it is detected that the transmission line does not need to melt ice, the rectifier circuit and the energy storage circuit are controlled to switch to a storage state to provide power to the grid. Therefore, when ice melting is not required, the rectifier circuit and the energy storage circuit can be controlled to switch to a storage state to store energy, thereby avoiding the ice melting equipment being out of service for a long time. This can improve the utilization rate of the ice melting equipment and promptly detect any abnormalities in the ice melting equipment. Moreover, when ice melting is required, one of the grid or energy storage circuit connected to the rectifier circuit can be controlled to melt ice for the transmission line, thereby meeting the ice melting needs in different situations and improving ice melting efficiency.

[0153] According to some embodiments of the present application, the demand acquisition module 210 is specifically used to: monitor the icing parameters of the transmission line, compare them with the icing threshold parameters, and determine the ice melting demand of the transmission line; or receive the ice melting demand sent by the transmission line.

[0154] According to some embodiments of the present application, the circuit control module 220 is specifically used to: when there is a need to melt ice on the transmission line, control at least one of the first switch unit of the rectifier circuit or the second switch unit of the energy storage circuit to be closed, so as to control at least one of the power grid or the energy storage circuit to which the rectifier circuit is connected to provide current to the transmission line.

[0155] According to some embodiments of the present application, the circuit control module 220 is specifically used to: in response to the closing of the third switch unit, control at least one of the first switch unit or the second switch unit to close, so as to control at least one of the power grid or energy storage circuit to which the rectifier circuit is connected to provide current to the transmission line; wherein, the third switch unit is arranged between the energy storage circuit and the transmission line.

[0156] According to some embodiments of the present application, the circuit control module 220 is specifically used to: control at least one of the first switch unit or the second switch unit to be closed based on the ice melting demand information of the transmission line, so as to control at least one of the power grid or the energy storage circuit connected to the rectifier circuit to provide current to the transmission line; wherein the ice melting demand information includes at least one of the ice melting voltage, ice melting current or ice melting time required for the transmission line to complete ice melting.

[0157] According to some embodiments of the present application, the circuit control module 220 is specifically used to: determine that the ice melting voltage is less than the operating voltage of the rectifier circuit, control the first switch unit to disconnect, the second switch unit to close, and switch the energy storage circuit to a discharge state to control the energy storage circuit to provide current to the transmission line.

[0158] According to some embodiments of the present application, the circuit control module 220 is specifically configured to: determine whether the ice-melting voltage reaches the operating voltage of the rectifier circuit, and control the first switch unit to close, so as to control the rectifier circuit to provide current to the transmission line.

[0159] According to some embodiments of the present application, the circuit control module 220 is specifically used to: determine that the ice-melting voltage reaches the operating voltage of the rectifier circuit and the ice-melting current is greater than the rated current of the rectifier circuit, control the first switch unit and the second switch unit to close, and switch the energy storage circuit to a discharge state to control the rectifier circuit and the energy storage circuit to provide current to the transmission line.

[0160] According to some embodiments of the present application, the circuit control module 220 is specifically used to: determine that the ice-melting voltage reaches the operating voltage of the rectifier circuit and the discharge time of the energy storage circuit is less than the ice-melting time, control the first switch unit and the second switch unit to close, and switch the energy storage circuit to a discharge state to control the rectifier circuit and the energy storage circuit to provide current to the transmission line; wherein the discharge time is determined according to the current capacity of the energy storage circuit and the ice-melting current.

[0161] According to some embodiments of the present application, the circuit control module 220 is specifically used to: when there is no ice melting demand on the transmission line, control the first switch unit of the rectifier circuit and the second switch unit of the energy storage circuit to close, and switch the energy storage circuit to the energy storage state, so as to control the power grid connected to the rectifier circuit to supply power to the energy storage circuit.

[0162] According to some embodiments of the present application, the circuit control module 220 is specifically used to: control the first switch unit and the second switch unit to close in response to the disconnection of the third switch unit; wherein the third switch unit is arranged between the energy storage circuit and the transmission line.

[0163] According to some embodiments of the present application, as shown in FIG13 , an embodiment of the present application provides an electronic device 300, comprising: a processor 301 and a memory 302, wherein the processor 301 and the memory 302 are interconnected and communicate with each other via a communication bus 303 and / or other forms of connection mechanisms (not shown), and the memory 302 stores a computer program executable by the processor 301. When the computing device is running, the processor 301 executes the computer program to execute a method executed by an external terminal in any optional implementation manner, for example: when there is a need to melt ice on the transmission line, controlling at least one of the power grid or the energy storage circuit connected to the rectifier circuit to provide current to the transmission line; or, when there is no need to melt ice on the transmission line, switching the energy storage circuit to a charging state so that the power grid connected to the rectifier circuit supplies power to the energy storage circuit, or switching the energy storage circuit to a discharging state so as to control the energy storage circuit to supply power to the power grid connected to the rectifier circuit.

[0164] The present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method in any of the aforementioned optional implementations is executed.

[0165] Among them, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0166] The present application provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute the method in any optional implementation manner.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An ice melting device, comprising a rectifier circuit, a controller and an energy storage circuit capable of switching between charge and discharge states; The first end of the rectifier circuit is connected to the first end of the energy storage circuit, and the second end of the rectifier circuit is connected to the second end of the energy storage circuit; The first end of the rectifier circuit and the first end of the energy storage circuit are connected to one end of a power transmission line having at least two ends, and the second end of the rectifier circuit and the second end of the energy storage circuit are connected to the other end of the power transmission line; The controller is connected to the rectifier circuit and the energy storage circuit.

2. The ice melting device according to claim 1, wherein: The energy storage circuit includes an energy storage unit connected to the rectifier circuit; The energy storage unit includes a plurality of energy storage groups connected in series, and the energy storage group includes a battery group and a power module connected to both ends of the battery group; The controller is connected to the power module.

3. The ice melting device according to claim 1, wherein: The rectifier circuit comprises a rectifier unit and a first switch unit, wherein a first end of the first switch unit is connected to the rectifier unit, a second end of the first switch unit is connected to the energy storage circuit, and a second end of the first switch unit is connected to the power transmission line; The controller is connected to the first switch unit.

4. The ice melting device according to claim 3, wherein: The first switch unit includes a first power switch and a second power switch; A first end of the first power switch is connected to a first end of the rectifier unit, a second end of the first power switch is connected to a first end of the energy storage circuit, and a second end of the first power switch is connected to one end of a power transmission line; The first end of the second power switch is connected to the second end of the rectifier unit, the second end of the second power switch is connected to the second end of the energy storage circuit, and the second end of the second power switch is connected to the other end of the transmission line.

5. The ice melting device according to claim 2, wherein: The energy storage circuit further includes a second switch unit, a first end of the second switch unit is connected to the energy storage unit, a second end of the second switch unit is connected to the rectifier circuit, and a second end of the second switch unit is connected to the power transmission line; The controller is connected to the second switch unit.

6. The ice melting device according to claim 5, wherein: The second switch unit includes a first switch and a second switch; A first end of the first switching switch is connected to a first end of the energy storage unit, a second end of the first switching switch is connected to a first end of the rectifier circuit, and a second end of the first switching switch is connected to one end of a power transmission line; The first end of the second switch is connected to the second end of the energy storage unit, the second end of the second switch is connected to the second end of the rectifier circuit, and the second end of the second switch is connected to the other end of the transmission line.

7. The ice melting device according to any one of claims 1 to 6, wherein: The energy storage circuit also includes a reactor; The reactor is arranged between the energy storage unit and the rectifier circuit.

8. The ice melting device according to any one of claims 1 to 6, wherein: The ice melting device further includes a third switch unit; The third switch unit is arranged between the energy storage circuit and the power transmission line; The controller is connected to the third switch unit.

9. The ice melting device according to claim 8, wherein: The third switch unit includes a first ice-melting switch and a second ice-melting switch; The first end of the first ice-melting switch is connected to the first end of the rectifier circuit and the first end of the energy storage circuit, and the second end of the first ice-melting switch is connected to one end of the transmission line; The first end of the second ice-melting switch is connected to the second end of the rectifier circuit and the second end of the energy storage circuit, and the second end of the second ice-melting switch is connected to the other end of the transmission line.

10. The ice melting device according to any one of claims 1 to 6, wherein: The ice melting device also includes a first phase line switch, a second phase line switch, a third phase line switch and a fourth phase line switch; The first end of the first phase line switch and the first end of the second phase line switch are connected to the first end of the energy storage circuit; The second end of the second phase line switch is connected to the first end of the third phase line switch, and the second end of the third phase line switch is connected to the second end of the energy storage circuit and the first end of the fourth phase line switch; The second end of the first phase line switch is connected to the first phase line of the transmission line, the second end of the second phase line switch and the second end of the third phase line switch are connected to the second phase line of the transmission line, and the second end of the fourth phase line switch is connected to the third phase line of the transmission line.

11. A control method for an ice melting device, applied to the ice melting device according to any one of claims 1 to 10, wherein the ice melting device is connected to a power grid via the third terminal of the rectifier circuit, and the method comprises: Obtaining ice melting requirements of the transmission line; When there is a need to melt ice on the transmission line, at least one of the rectifier circuit or the energy storage circuit is controlled to switch to a melting state to provide current to the transmission line; or When there is no ice melting demand on the power transmission line, the rectifier circuit and the energy storage circuit are controlled to switch to an energy storage state to provide power consumption to the power grid.

12. The control method of ice melting equipment according to claim 11, wherein: Obtaining ice melting requirements of the transmission line, including: Monitoring the icing parameters of the transmission line, comparing them with the icing threshold parameters, and determining the ice melting requirements of the transmission line; Alternatively, an ice melting demand sent by the transmission line is received.

13. The control method of ice melting equipment according to claim 11 or 12, wherein: When there is a need to melt ice on the transmission line, controlling at least one of the rectifier circuit or the energy storage circuit to switch to a melting ice state to provide current to the transmission line includes: When there is a need to melt ice on the transmission line, at least one of the first switch unit of the rectifier circuit or the second switch unit of the energy storage circuit is controlled to be closed, so as to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line.

14. The control method of ice melting equipment according to claim 13, wherein: Controlling at least one of the first switch unit of the rectifier circuit or the second switch unit of the energy storage circuit to be closed, so as to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, comprising: In response to the closing of the third switch unit, controlling at least one of the first switch unit or the second switch unit to close, so as to control at least one of the power grid connected to the rectifier circuit or the energy storage circuit to provide current to the transmission line; Wherein, the third switch unit is arranged between the energy storage circuit and the power transmission line.

15. The control method of ice melting equipment according to claim 13, wherein: Controlling at least one of the first switch unit or the second switch unit to close, so as to control the grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, comprising: According to the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed, so as to control the power grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line; The ice-melting requirement information includes at least one of the ice-melting voltage, ice-melting current or ice-melting time required for the transmission line to complete ice melting.

16. The control method of ice melting equipment according to claim 15, wherein: According to the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed, so as to control the grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, including: Determine that the ice-melting voltage is less than the operating voltage of the rectifier circuit, control the first switch unit to be disconnected, the second switch unit to be closed, and switch the energy storage circuit to a discharge state to control the energy storage circuit to provide current to the transmission line.

17. The control method of ice melting equipment according to claim 15 or 16, wherein: According to the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed, so as to control the grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, including: It is determined that the ice-melting voltage reaches the operating voltage of the rectifier circuit, and the first switch unit is controlled to be closed, so as to control the power grid connected to the rectifier circuit to provide current to the transmission line.

18. The control method of ice melting equipment according to claim 15 or 16, wherein: According to the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed, so as to control the grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, including: Determine that the ice-melting voltage reaches the operating voltage of the rectifier circuit and that the ice-melting current is greater than the rated current of the rectifier circuit, control the first switch unit and the second switch unit to be closed, and switch the energy storage circuit to a discharge state, so as to control the power grid connected to the rectifier circuit and the energy storage circuit to provide current to the transmission line.

19. The control method of ice melting equipment according to claim 15 or 16, wherein: According to the ice melting demand information of the transmission line, at least one of the first switch unit or the second switch unit is controlled to be closed, so as to control the grid connected to the rectifier circuit or at least one of the energy storage circuits to provide current to the transmission line, including: Determining that the ice-melting voltage reaches the operating voltage of the rectifier circuit and the discharge duration of the energy storage circuit is less than the ice-melting duration, controlling the first switch unit and the second switch unit to be closed, and switching the energy storage circuit to a discharge state, so as to control the power grid connected to the rectifier circuit and the energy storage circuit, and provide current to the transmission line; The discharge duration is determined according to the current capacity of the energy storage circuit and the ice-melting current.

20. The control method of ice melting equipment according to any one of claim 12, wherein: When there is no ice melting demand on the transmission line, controlling the rectifier circuit and the energy storage circuit to switch to an energy storage state to provide power consumption to the power grid includes: When there is no ice melting demand on the transmission line, the first switch unit of the rectifier circuit and the second switch unit of the energy storage circuit are controlled to be closed, and the energy storage circuit is switched to the energy storage state, so as to control the power grid connected to the rectifier circuit to supply power to the energy storage circuit.

21. The control method of ice melting equipment according to claim 20, wherein: Controlling the first switch unit of the rectifier circuit and the second switch unit of the energy storage circuit to close includes: In response to the third switch unit being opened, controlling the first switch unit and the second switch unit to be closed; Wherein, the third switch unit is arranged between the energy storage circuit and the power transmission line.

22. A control device for an ice melting device, applied to the ice melting device according to any one of claims 1 to 10, the device comprising: A demand acquisition module, used to acquire the ice melting demand of the transmission line; A circuit control module is used to control at least one of the rectifier circuit or the energy storage circuit to switch to an ice-melting state to provide current to the transmission line when there is a need to melt ice on the transmission line; or, when there is no need to melt ice on the transmission line, control the rectifier circuit and the energy storage circuit to switch to an energy storage state to provide power consumption to the power grid.

23. An electronic device, comprising a processor and a memory storing a computer program, wherein the processor implements the control method of the ice melting device according to claims 11 to 21 when executing the computer program.

24. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the control method of the ice melting device according to claims 11-21.

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