Energy storage converter system, control method thereof and electronic equipment

Abstract

The invention discloses an energy storage converter system, a control method thereof and electronic equipment. The energy storage converter system comprises an energy storage converter, a first switch connected to the direct current side of the energy storage converter, a second switch connected to the alternating current side of the energy storage converter, and a bus capacitor connected in parallel with the first switch. The control method of the energy storage converter system comprises the following steps: acquiring a first modulation ratio between the alternating current side and the bus capacitor; when the first modulation ratio is greater than a first modulation ratio threshold, reducing the input power of the alternating current side; determining the turn-off sequence of the first switch and the second switch according to the size relationship between the first modulation ratio value and a second modulation ratio threshold value; wherein the second modulation ratio threshold value is greater than the first modulation ratio threshold value. According to the invention, the turn-off reliability of the energy storage converter is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of converter control, and in particular to an energy storage converter system and a control method and electronic equipment thereof. Background Art

[0002] The energy storage inverter is easily affected by grid fluctuations during operation, causing the AC side of the energy storage inverter to be impacted by high voltage, while the DC side does not have a boost function, causing the modulation ratio of the energy storage inverter to exceed the normal range, resulting in over-modulation.

[0003] When overmodulation occurs, if the switches between the AC side and the DC side are directly cut off, the excessively high current will affect the life of the switch and even cause direct damage to the switch. Summary of the invention

[0004] The present invention provides an energy storage converter system and a control method thereof, and electronic equipment, so as to improve the reliability of shutting down the energy storage converter.

[0005] According to one aspect of the present invention, a control method for an energy storage converter system is provided, wherein the energy storage converter system comprises: an energy storage converter, a first switch connected to a DC side of the energy storage converter, a second switch connected to an AC side of the energy storage converter, and a bus capacitor connected in parallel with the first switch;

[0006] The control method of the energy storage converter system comprises:

[0007] Acquire a first modulation ratio between the AC side and the bus capacitor;

[0008] When the first modulation ratio is greater than a first modulation ratio threshold, reducing the input power of the AC side;

[0009] The turn-off sequence of the first switch and the second switch is determined according to the magnitude relationship between the first modulation ratio value and a second modulation ratio threshold value; wherein the second modulation ratio threshold value is greater than the first modulation ratio threshold value.

[0010] Optionally, acquiring a first modulation ratio between the AC side and the bus capacitor includes:

[0011] Acquire a first voltage peak value of the AC side and a second voltage peak value of the bus capacitor;

[0012] The first modulation ratio is determined according to a ratio of the first voltage peak value to the second voltage peak value.

[0013] Optionally, after obtaining the first modulation ratio between the AC side and the bus capacitor, the method further includes:

[0014] When the first modulation ratio is less than or equal to the first modulation ratio threshold, it is determined that the energy storage converter system is in a normal state and maintains normal operation.

[0015] Optionally, determining a turn-off sequence of the first switch and the second switch according to a difference between the first modulation ratio value and a second modulation ratio threshold value includes:

[0016] When the first modulation ratio is greater than the second modulation ratio threshold, the second switch is turned off after the first switch is controlled to be turned off.

[0017] Optionally, when the first modulation ratio is greater than the second modulation ratio threshold, after controlling the first switch to be turned off, the second switch to be turned off includes:

[0018] When the first modulation ratio is greater than the second modulation ratio threshold, controlling the first switch to be turned off;

[0019] Obtaining an output current value of the AC side;

[0020] When the output current value of the AC side is less than the current threshold, controlling the second switch to turn off;

[0021] When the output current value of the AC side is greater than or equal to the current threshold, the second switch is controlled to be turned off after a first delay.

[0022] Optionally, after controlling the first switch to be turned off when the first modulation ratio is greater than the second modulation ratio threshold, the method further includes:

[0023] The AC side charges the bus capacitor through the second switch.

[0024] Optionally, determining a turn-off sequence of the first switch and the second switch according to a difference between the first modulation ratio value and a second modulation ratio threshold value further includes:

[0025] When the first modulation ratio is less than or equal to the second modulation ratio threshold, the first switch is turned off after the second switch is controlled to be turned off.

[0026] Optionally, when the first modulation ratio is less than or equal to the second modulation ratio threshold, after controlling the second switch to be turned off, the first switch being turned off includes:

[0027] Obtaining an output current value of the AC side;

[0028] When the output current value of the AC side is less than the current threshold, controlling the second switch to turn off;

[0029] When the output current value of the AC side is greater than or equal to the current threshold, after a first delay, the second switch is controlled to be turned off;

[0030] When the second switch is turned off, the first switch is controlled to be turned off.

[0031] According to another aspect of the present invention, there is provided an energy storage inverter system, which is applied to the control method of the energy storage inverter system described in any embodiment of the present invention, comprising: a control module, an energy storage inverter, a first switch connected to the DC side of the energy storage inverter, a second switch connected to the AC side of the energy storage inverter, and a bus capacitor connected in parallel with the first switch; the control module is used to control the on and off of the first switch and the second switch.

[0032] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0033] at least one processor; and

[0034] a memory communicatively connected to the at least one processor; wherein,

[0035] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the energy storage converter system described in any embodiment of the present invention.

[0036] The technical solution provided by the embodiment of the present invention can directly reduce the current of the second switch to a range within which the second switch can be safely turned off, and safely turn off the second switch by adjusting the power on the AC side during overmodulation when the first modulation ratio is less than or equal to the second modulation ratio threshold. When the first modulation ratio is greater than the second modulation ratio threshold, the AC side charges the bus capacitor by preferentially turning off the first switch, thereby adjusting the current of the second switch so that the second switch can be safely turned off. Therefore, the present invention realizes reliable removal of the energy storage converter when overmodulation occurs, avoids damage to the second switch due to excessive current, and has high reliability.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 It is a structural schematic diagram of an energy storage converter system provided by the prior art;

[0040] Figure 2 is a flow chart of a control method of an energy storage converter system provided according to an embodiment of the present invention;

[0041] Figure 3 is a flow chart of another control method of an energy storage converter system provided according to an embodiment of the present invention;

[0042] Figure 4 is a flow chart of another control method of an energy storage converter system provided according to an embodiment of the present invention;

[0043] Figure 5 is a flowchart of a specific implementation method of S131 provided according to an embodiment of the present invention;

[0044] Figure 6 is a flow chart of another control method of an energy storage converter system provided according to an embodiment of the present invention;

[0045] Figure 7 is a flowchart of a specific implementation method of S132 provided according to an embodiment of the present invention;

[0046] Figure 8 is a flow chart of another control method of an energy storage converter system provided according to an embodiment of the present invention;

[0047] Fig. 9 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0049] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0050] An embodiment of the present invention provides a control method for an energy storage converter system. The control method can be executed by the energy storage converter system and can be implemented in the form of software and / or hardware. Figure 1 A schematic diagram of the structure of an energy storage converter system provided by the prior art. Figure 1 The energy storage converter system includes: an energy storage converter 1, a first switch 2 connected to a DC side 3 of the energy storage converter, a second switch 4 connected to an AC side 5 of the energy storage converter, and a bus capacitor 6 connected in parallel with the first switch 2. Figure 1 The energy storage converter system provided adopts a primary DC / AC topology structure, the DC / AC topology is a unidirectional or bidirectional topology structure, the bus capacitor 6 is directly connected to the DC side 3 of the energy storage converter, and the DC side 3 of the energy storage converter does not have a DC / DC boost function. When the modulation ratio of the energy storage converter exceeds the normal range, overmodulation is likely to occur. It is understandable that Figure 1 The energy storage converter system is only a topology of a conversion circuit of the energy storage converter 1, and does not limit the energy storage converter 1. The energy storage converter 1 can be any energy storage converter 1 that can realize the conversion function. The control method of the energy storage converter system provided by the present invention can be applied to any energy storage converter 1 that can realize the conversion function.

[0051] Among them, the A-phase electricity on the AC side 5 of the energy storage converter can be connected to the first transistor Q1 and the fourth transistor Q4 in the energy storage converter 1 through the first inductor L1, the B-phase electricity on the AC side 5 of the energy storage converter can be connected to the second transistor Q2 and the fifth transistor Q5 in the energy storage converter 1 through the second inductor L2, and the C-phase electricity on the AC side 5 of the energy storage converter can be connected to the third transistor Q3 and the sixth transistor Q6 in the energy storage converter 1 through the third inductor L3. The various transistors in the energy storage converter 1 are only one of the connection methods used in the DC / AC topology structure and are not limited. Exemplarily, the first switch 2 and the second switch 4 include switching elements such as relays, contactors, and circuit breakers that can realize the opening and closing functions.

[0052] Figure 2 A flow chart of a control method for an energy storage converter system provided by an embodiment of the present invention.

[0053] refer to Figure 2 , the control method of the energy storage converter system includes:

[0054] S110, obtaining a first modulation ratio between the AC side and the bus capacitor.

[0055] Among them, the energy storage converter can monitor the voltage peak of the AC side and the voltage peak of the bus capacitor in real time. The ratio between the voltage peak of the AC side and the voltage peak of the bus capacitor is the first modulation ratio. When the first modulation ratio is too high, it means that the energy storage converter has overmodulated. At this time, in order to protect the safe operation of the energy storage converter, different first switch and second switch shutdown strategies need to be formulated according to different first modulation ratios to shut down the energy storage converter.

[0056] S120 . When the first modulation ratio is greater than a first modulation ratio threshold, reduce input power on the AC side.

[0057] Among them, when the first modulation ratio is greater than the first modulation ratio threshold, it means that the AC side of the energy storage converter has a higher voltage and current, and the energy storage converter has been overmodulated. When overmodulation occurs, the current on the AC side of the energy storage converter will be uncontrolled, and the greater the voltage difference between the AC side and the DC side, the greater the current value on the AC side. At this time, if the second switch on the AC side is forcibly disconnected, it will inevitably affect the service life of the second switch, and even cause it to be directly damaged.

[0058] Therefore, when overmodulation occurs, the current flowing through the second switch on the AC side can be reduced by preferentially reducing the input power on the AC side. This setting can reduce the current transmitted by the second switch when it is turned off, ensuring safety during shutdown.

[0059] S130: Determine a turn-off sequence of the first switch and the second switch according to a magnitude relationship between the first modulation ratio and the second modulation ratio threshold.

[0060] Exemplarily, the first modulation ratio threshold and the second modulation ratio threshold can be selected based on multiple factors such as the inverter drive dead zone, voltage level, power level and performance of each transistor of the energy storage converter. For example, the first modulation ratio threshold can be set between 1.0-1.1, and the second modulation ratio threshold can be set between 1.1-1.2, and the second modulation ratio threshold is greater than the first modulation ratio threshold.

[0061] When the first modulation ratio is greater than the first modulation ratio threshold and less than or equal to the second modulation ratio threshold, it means that although overmodulation occurs at this time, the degree is not serious. By reducing the input power on the AC side, the current of the second switch can generally be reduced to a range where the second switch can be safely turned off. At this time, the second switch can be controlled to turn off first to cut off the power supply on the AC side, and then the first switch can be turned off to remove the energy storage converter.

[0062] When the first modulation ratio is greater than the first modulation ratio threshold and greater than the second modulation ratio threshold, it means that the input power on the AC side is large and the overmodulation phenomenon is more serious. At this time, even if the input power on the AC side is reduced, the current of the second switch cannot be reduced to the range within which the second switch can be safely turned off. At the moment of overmodulation, the DC side current has not yet been raised, and the first switch is still within the range that can be safely turned off. Therefore, the first switch is turned off first. After the first switch is turned off, the bus capacitor is disconnected from the DC side, and the AC side charges the bus capacitor through the second switch, so that the voltage of the bus capacitor can be raised to the peak voltage of the AC side, and the excessive current on the second switch is effectively reduced, thereby reducing the current of the second switch to the range within which the second switch can be safely turned off. At this time, the second switch can be controlled to be safely turned off, so that the energy storage converter is cut off.

[0063] The technical solution provided by the embodiment of the present invention can directly reduce the current of the second switch to a range within which the second switch can be safely turned off, and safely turn off the second switch by adjusting the power on the AC side during overmodulation when the first modulation ratio is less than or equal to the second modulation ratio threshold. When the first modulation ratio is greater than the second modulation ratio threshold, the AC side charges the bus capacitor by preferentially turning off the first switch, thereby adjusting the current of the second switch so that the second switch can be safely turned off. Therefore, the present invention realizes reliable removal of the energy storage converter when overmodulation occurs, avoids damage to the second switch due to excessive current, and has high reliability.

[0064] Figure 3 A flow chart of another control method of an energy storage converter system provided by an embodiment of the present invention. Figure 3 Based on the above embodiments, optionally, S110, obtaining a first modulation ratio between the AC side and the bus capacitor includes:

[0065] S111, obtaining a first voltage peak value of the AC side and a second voltage peak value of the bus capacitor.

[0066] S112. Determine a first modulation ratio according to a ratio of the first voltage peak value to the second voltage peak value.

[0067] The energy storage converter monitors the voltage of the AC side and the bus capacitor in real time to obtain a first voltage peak of the AC side and a second voltage peak of the bus capacitor. The ratio of the first voltage peak to the second voltage peak is the first modulation ratio.

[0068] When the first modulation ratio is larger, it means that the voltage and current acting on the second switch on the AC side of the energy storage converter are also higher. If the second switch is forcibly turned off at this time, it will affect the service life of the second switch and even cause direct damage to it. Therefore, when the first modulation ratio is greater than the first modulation ratio threshold, the input power on the AC side can be reduced first, thereby reducing the current flowing through the second switch. And according to the relationship between the first modulation ratio and the second modulation ratio threshold, the turn-off order of the first switch and the second switch is determined, so that the second switch on the AC side can be safely turned off.

[0069] On the basis of the above embodiments, optionally, after obtaining the first modulation ratio between the AC side and the bus capacitor, it also includes: when the first modulation ratio is less than or equal to the first modulation ratio threshold, determining that the energy storage inverter system is in a normal state and maintaining normal operation.

[0070] Among them, the first modulation ratio threshold is used to reflect whether the energy storage converter has overmodulation. If the first modulation ratio does not reach the first modulation ratio threshold, it means that the energy storage converter system is in a normal state. At this time, there is no need to control the first switch and the second switch. The energy storage converter system can continue to monitor the voltage peak on the AC side and the voltage peak of the bus capacitor in real time, judge the size relationship between the first modulation ratio and the first modulation ratio threshold in real time, and make timely adjustments when abnormalities occur.

[0071] Figure 4 A flow chart of another control method of an energy storage converter system provided by an embodiment of the present invention. Figure 4 Based on the above embodiments, optionally, S130, determining the turn-off sequence of the first switch and the second switch according to the difference between the first modulation ratio value and the second modulation ratio threshold value includes:

[0072] S131. When the first modulation ratio is greater than the second modulation ratio threshold, the second switch is turned off after the first switch is controlled to be turned off.

[0073] Among them, when the first modulation ratio reaches the second modulation ratio threshold, it indicates that the degree of overmodulation is serious. At this time, even if the input power on the AC side is reduced, the second switch still cannot reach the condition for safe shutdown. Therefore, the first switch can be controlled to turn off first to disconnect the DC side of the energy storage converter. The AC side charges the bus capacitor through the second switch, so that the voltage of the bus capacitor can be raised to the voltage peak of the AC side, so that the excessive current on the second switch is effectively reduced. At this time, the second switch can be controlled to turn off, so that the energy storage converter can be reliably cut off.

[0074] Figure 5 A flowchart of a specific implementation method of S131 provided in an embodiment of the present invention. Figure 5 On the basis of the above embodiments, optionally, S131, when the first modulation ratio is greater than the second modulation ratio threshold, after controlling the first switch to be turned off, the second switch to be turned off includes:

[0075] S1311. When the first modulation ratio is greater than the second modulation ratio threshold, control the first switch to be turned off.

[0076] Optionally, the AC side charges the bus capacitor through a second switch.

[0077] After the first switch is turned off, the connection between the DC side and the bus capacitor is disconnected. The AC side charges the bus capacitor through the second switch, so that the voltage of the bus capacitor can be raised to the voltage peak of the AC side, thereby achieving current regulation of the second switch.

[0078] S1312. Obtain the output current value of the AC side.

[0079] S1313: When the output current value of the AC side is less than the current threshold, control the second switch to be turned off.

[0080] The current threshold may be the maximum current that the second switch can safely shut down. The current regulation of the second switch can be achieved by charging the bus capacitor on the AC side. When the output current value of the AC side is less than the current threshold, the current flowing through the second switch has reached the current range that the second switch can safely shut down. At this time, the second switch can be directly controlled to shut down.

[0081] S1314: When the output current value of the AC side is greater than or equal to the current threshold, after a first delay, the second switch is controlled to be turned off.

[0082] Wherein, after adjusting the current of the second switch, if the current still cannot reach the current range within which the second switch can be safely turned off, the second switch can be forced to turn off after a first delay.

[0083] Although the current flowing through the second switch at this time does not reach the current range that can be safely shut down, after charging the bus capacitor and continuing to charge within the first time, even if the current flowing through the second switch does not reach the current threshold, it will be close to the current threshold. At this time, compared with the method of directly shutting down without current regulation, it still has higher safety and can protect the second switch to the greatest extent.

[0084] Figure 6 A flow chart of another control method of an energy storage converter system provided by an embodiment of the present invention. Figure 6 Based on the above embodiments, optionally, S130, determining the turn-off sequence of the first switch and the second switch according to the difference between the first modulation ratio value and the second modulation ratio threshold value further includes:

[0085] S132: When the first modulation ratio is less than or equal to the second modulation ratio threshold, the first switch is turned off after the second switch is controlled to be turned off.

[0086] Among them, when the first modulation ratio does not reach the second modulation ratio threshold, it means that although overmodulation occurs at this time, the degree is not serious. After reducing the input power on the AC side, the current of the second switch can be reduced to a range where the second switch can be safely turned off. At this time, the second switch can be controlled to be turned off first, and then the first switch can be turned off, thereby removing the energy storage converter.

[0087] Figure 7 A flowchart of a specific implementation method of S132 provided by an embodiment of the present invention. Figure 7 On the basis of the above embodiments, optionally, in S132, when the first modulation ratio is less than or equal to the second modulation ratio threshold, after controlling the second switch to be turned off, the first switch to be turned off includes:

[0088] S1321. Obtain the output current value of the AC side.

[0089] S1322: When the output current value of the AC side is less than the current threshold, control the second switch to turn off.

[0090] Among them, when the first modulation ratio is less than or equal to the second modulation ratio threshold, it means that although overmodulation occurs at this time, the degree is not serious. By reducing the input power on the AC side, the current of the second switch can generally be reduced to a range within which the second switch can be safely turned off. When the output current value on the AC side is less than the current threshold, the second switch can be directly controlled to turn off, cutting off the power supply on the AC side.

[0091] S1323: When the output current value of the AC side is greater than or equal to the current threshold, after a first delay, the second switch is controlled to be turned off.

[0092] Among them, after adjusting the current of the second switch, if the current still cannot reach the current range within which the second switch can be safely turned off, due to the adjustment of the input power on the AC side, even if the current flowing through the second switch is not less than the current threshold, it will be close to the current threshold. At this time, the second switch can be directly turned off, which is still safer than the method of directly turning off without current adjustment.

[0093] S1324: After the second switch is turned off, control the first switch to be turned off.

[0094] When the second switch on the AC side is turned off, the excessively high voltage on the AC side will not be input into the energy storage converter. At this time, the first switch can be turned off safely.

[0095] Figure 8 A flow chart of another control method of an energy storage converter system provided by an embodiment of the present invention. Figure 8 Based on the above embodiments, optionally, the method includes:

[0096] S210: Calculate a first modulation ratio.

[0097] S220, determine whether the first modulation ratio is greater than the first modulation ratio threshold; if so, execute S230; if not, return to execute S210.

[0098] S230. Reduce the input power on the AC side.

[0099] S240, determine whether the first modulation ratio is greater than the second modulation ratio threshold; if so, execute S290; if not, execute S250.

[0100] S250, determine whether the output current value of the AC side is less than the current threshold; if so, execute S270; if not, execute S260.

[0101] S260, waiting for the first delay time.

[0102] S270: The second switch is turned off.

[0103] S280: The first switch is turned off.

[0104] S290: The first switch is turned off.

[0105] S300, bus capacitor charging.

[0106] S310, determine whether the output current value of the AC side is less than the current threshold; if so, execute S330; if not, execute S320.

[0107] S320, waiting for the first delay time.

[0108] S330: The second switch is turned off.

[0109] The embodiment of the present invention further provides an energy storage converter system, which is used to execute the control method of the energy storage converter system provided by any embodiment of the present invention. Figure 1 The energy storage inverter system includes: a control module, an energy storage inverter 1, a first switch 2 connected to the DC side 3 of the energy storage inverter, a second switch 4 connected to the AC side 5 of the energy storage inverter, and a bus capacitor 6 connected in parallel with the first switch 2; the control module is used to control the on and off of the first switch 2 and the second switch 4.

[0110] The energy storage converter system provided in the embodiment of the present invention can directly reduce the current of the second switch to a range within which the second switch can be safely turned off, and safely turn off the second switch by adjusting the power on the AC side during overmodulation when the first modulation ratio is less than or equal to the second modulation ratio threshold. When the first modulation ratio is greater than the second modulation ratio threshold, the AC side charges the bus capacitor by preferentially turning off the first switch, thereby adjusting the current of the second switch so that the second switch can be safely turned off. Therefore, the present invention realizes reliable removal of the energy storage converter when overmodulation occurs, avoids damage to the second switch due to excessive current, and has high reliability.

[0111] An embodiment of the present invention further provides an electronic device. The electronic device includes: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the energy storage converter system provided by any embodiment of the present invention.

[0112] Fig. 9 A schematic diagram of an electronic device that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0113] like Fig. 9As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0114] A number of components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0115] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the control method of the energy storage converter system.

[0116] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0117] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for an energy storage converter system, characterized in that: The energy storage converter system comprises: an energy storage converter, a first switch connected to the DC side of the energy storage converter, a second switch connected to the AC side of the energy storage converter, and a bus capacitor connected in parallel with the first switch; The control method of the energy storage converter system comprises: Acquire a first modulation ratio between the AC side and the bus capacitor; When the first modulation ratio is greater than a first modulation ratio threshold, reducing the input power of the AC side; The turn-off sequence of the first switch and the second switch is determined according to the magnitude relationship between the first modulation ratio value and a second modulation ratio threshold value; wherein the second modulation ratio threshold value is greater than the first modulation ratio threshold value.

2. The control method of the energy storage converter system according to claim 1, characterized in that: The obtaining of a first modulation ratio between the AC side and the bus capacitor comprises: Acquire a first voltage peak value of the AC side and a second voltage peak value of the bus capacitor; The first modulation ratio is determined according to a ratio of the first voltage peak value to the second voltage peak value.

3. The control method of the energy storage converter system according to claim 1, characterized in that: After obtaining the first modulation ratio between the AC side and the bus capacitor, the method further includes: When the first modulation ratio is less than or equal to the first modulation ratio threshold, it is determined that the energy storage converter system is in a normal state and maintains normal operation.

4. The control method of the energy storage converter system according to claim 1, characterized in that: The step of determining the turn-off sequence of the first switch and the second switch according to the difference between the first modulation ratio value and the second modulation ratio threshold value comprises: When the first modulation ratio is greater than the second modulation ratio threshold, the second switch is turned off after the first switch is controlled to be turned off.

5. The control method of the energy storage converter system according to claim 4, characterized in that: When the first modulation ratio is greater than the second modulation ratio threshold, after controlling the first switch to be turned off, the second switch to be turned off includes: When the first modulation ratio is greater than the second modulation ratio threshold, controlling the first switch to be turned off; Obtaining an output current value of the AC side; When the output current value of the AC side is less than the current threshold, controlling the second switch to turn off; When the output current value of the AC side is greater than or equal to the current threshold, the second switch is controlled to be turned off after a first delay.

6. The control method of the energy storage converter system according to claim 5, characterized in that: After controlling the first switch to be turned off when the first modulation ratio is greater than the second modulation ratio threshold, the method further includes: The AC side charges the bus capacitor through the second switch.

7. The control method of the energy storage converter system according to claim 1, characterized in that: The step of determining the turn-off sequence of the first switch and the second switch according to the difference between the first modulation ratio value and the second modulation ratio threshold value further includes: When the first modulation ratio is less than or equal to the second modulation ratio threshold, the first switch is turned off after the second switch is controlled to be turned off.

8. The control method of the energy storage converter system according to claim 7, characterized in that: When the first modulation ratio is less than or equal to the second modulation ratio threshold, after controlling the second switch to be turned off, the first switch being turned off includes: Obtaining an output current value of the AC side; When the output current value of the AC side is less than the current threshold, controlling the second switch to turn off; When the output current value of the AC side is greater than or equal to the current threshold, after a first delay, the second switch is controlled to be turned off; When the second switch is turned off, the first switch is controlled to be turned off.

9. An energy storage converter system, characterized in that: A control method for executing the energy storage inverter system described in any one of claims 1 to 8, comprising: a control module, an energy storage inverter, a first switch connected to the DC side of the energy storage inverter, a second switch connected to the AC side of the energy storage inverter, and a bus capacitor connected in parallel with the first switch; the control module is used to control the on and off of the first switch and the second switch.

10. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the energy storage converter system according to any one of claims 1 to 8.

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