Control method and device of sending end system, electronic equipment and storage medium

Abstract

The invention relates to a control method and device of a sending end system, electronic equipment, a computer readable storage medium and a computer program product, and the method of some embodiments comprises the steps: determining whether the frequency variation of the sending end system exceeds a preset frequency variation range or not under the condition of commutation failure; determining whether to cut off a part of new energy units of the sending end system or not based on a judgment result of whether the frequency variation exceeds the preset frequency variation range or not; and executing a control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending end system. Based on the scheme of the embodiment of the invention, the frequency stability of the power grid under the condition of commutation failure can be improved.

Description

Technical Field

[0001] The present application relates to the field of power systems, and in particular to a control method for a sending-end system, a control device for a sending-end system, an electronic device, a computer-readable storage medium, and a computer program product. Background Art

[0002] The DC transmission system line is suitable for long-distance, high-power transmission due to its low cost, low loss, low operating cost, and reliable operation. Therefore, it has incomparable advantages over AC transmission in long-distance, high-capacity overhead transmission, grid interconnection, long-distance submarine cable transmission, and transmission with new energy. However, during the use of the DC transmission system, when AC and DC faults occur, it is easy to cause the commutation failure process of the DC receiving-end converter valve. During the commutation failure, the DC voltage drops rapidly in a short period of time, resulting in the inability to output DC power normally. If multiple commutation failures occur, it is easy to trigger the DC locking command of the control and protection system, and the DC locking will lose a large number of power transmission channels, resulting in a power surplus in the sending-end system, a rapid increase in frequency, and the unit disconnection from the grid, affecting the stability of the power system. Summary of the invention

[0003] Based on this, it is necessary to provide a control method for a sending-end system, a control device for a sending-end system, an electronic device, a computer-readable storage medium and a computer program product for the sending-end system to improve the frequency stability of the sending-end system in the event of a commutation failure in order to address the above technical problems.

[0004] In a first aspect, the present application provides a control method for a delivery system, the method comprising:

[0005] In the event of a commutation failure, determining whether the frequency variation of the sending-end system exceeds a preset frequency variation range;

[0006] Based on the judgment result of whether the frequency variation exceeds the preset frequency variation range, determining whether to cut off part of the new energy units of the sending end system;

[0007] Execute a control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending-end system.

[0008] Based on the control method of the sending-end system provided in the embodiment of the present application, when a commutation failure occurs, the power is not directly cut off. Instead, based on the judgment result of whether the frequency change of the sending-end system exceeds the preset frequency change direction, it is decided whether some new energy units of the sending-end system need to be cut off, and corresponding control actions are performed accordingly. That is, in the event of a commutation failure, the new energy units may not be directly cut off based on the frequency change situation, so as to improve the frequency stability of the power grid.

[0009] In some embodiments, the determining whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency variation exceeds the preset frequency variation range includes:

[0010] When the frequency variation exceeds the preset frequency variation range, it is determined that part of the new energy units of the sending-end system needs to be cut off.

[0011] Therefore, when the frequency variation exceeds the preset frequency variation range, it indicates that the grid frequency fluctuates greatly, and thus it is determined that some new energy units need to be removed to reduce grid frequency fluctuations and improve grid stability.

[0012] In some embodiments, the determining whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency variation exceeds the preset frequency variation range includes:

[0013] When the frequency variation does not exceed the preset frequency variation range, it is determined that there is no need to cut off the new energy unit of the sending-end system.

[0014] Therefore, when the frequency change exceeds the preset frequency change range, it means that the frequency fluctuation is small, and not cutting off the new energy unit can meet the grid stability requirements to a certain extent. Not cutting off the new energy unit can also reduce the amplitude of power changes caused by directly cutting off the new energy unit, thereby further improving the stability of the grid.

[0015] In some embodiments, the executing of the control action corresponding to the determination result of whether to cut off some of the new energy units of the sending-end system includes:

[0016] In the case where it is determined that some of the new energy units of the sending-end system need to be removed, the new energy units to be removed are determined based on the absorbable power of the energy storage power station and the loss power of the sending-end system;

[0017] The new energy generating set to be cut off is cut off, and the power absorption of the energy storage power station is controlled.

[0018] Therefore, when it is determined that some new energy units need to be cut off, the new energy units to be cut off are determined by combining the absorbable power of the energy storage power station and the loss power of the sending-end system, and the new energy units are cut off accordingly, that is, the power of the cut new energy units is matched with the absorbable power of the energy storage power station and the loss power of the sending-end system. It can be combined with the absorbable power of the energy storage power station, so that when the absorbable power of the energy storage power station is taken into consideration, the power to be cut off can be reduced, thereby reducing the situation where the power of the sending-end system changes drastically due to the drastic cut of the power of the new energy units, and further improving the stability of the sending-end system.

[0019] In some embodiments, the step of determining the new energy generating unit to be removed based on the absorbable power of the energy storage power station and the power loss of the sending-end system includes:

[0020] Obtaining the absorbable power of the energy storage power station;

[0021] Determining the power to be cut off based on the difference between the loss power of the sending-end system and the absorbable power;

[0022] Based on the power to be removed, the new energy units to be removed are determined.

[0023] Therefore, the power to be cut off is determined by the difference between the power loss and the absorbable power of the sending-end system. On the basis of the power loss of the sending-end system, the energy storage power station absorbs part of the power, so that the actual power to be cut off is reduced relative to the power loss of the sending-end system. Therefore, after power cutting, the power change becomes smaller relative to the power loss of the sending-end system, which reduces the situation of large power changes in the sending-end system and improves the stability of the sending-end system.

[0024] In some embodiments, the absorbable power of the energy storage power station is the maximum absorbable power of the energy storage power station.

[0025] Therefore, by considering the maximum absorbable power of the energy storage power station, the energy storage power station can absorb power at the maximum absorbable power, so that the power change after power cut-off is as small as possible relative to the power loss of the sending-end system, and can be in an ideal minimum state, which can further reduce the amplitude of the power change of the sending-end system and improve the stability of the sending-end system.

[0026] In some embodiments, the executing of the control action corresponding to the determination result of whether to cut off some of the new energy units of the sending-end system includes:

[0027] When it is determined that there is no need to cut off the new energy generating unit of the sending-end system, obtaining the battery charge state of the energy storage power station;

[0028] Based on the battery charge state, the power supply equipment of the sending end system is controlled to perform frequency modulation.

[0029] Therefore, without the need to cut off the new energy units of the sending-end system, the power supply equipment of the sending-end system can be controlled by the battery charge state of the energy storage power station to perform a frequency modulation. This can alleviate the frequency change of the sending-end system and improve the stability of the sending-end system.

[0030] In some embodiments, the method further comprises:

[0031] When it is determined that there is no need to cut off the new energy generating set of the sending-end system, the DC power transmission system is controlled to clear the fault and restart the DC power transmission system.

[0032] Therefore, without the need to cut off the new energy units of the sending-end system, the power loss caused by commutation failure can be solved by controlling the DC transmission system to clear the fault and restart it, thereby reducing the situation where the DC transmission system is continuously in a commutation failure state, resulting in DC locking, and then causing a large amount of power loss, so as to completely solve the problem of power loss caused by commutation failure in the sending-end system and further improve the stability of the sending-end system.

[0033] In some embodiments, controlling the power supply device of the sending-end system to perform frequency modulation based on the battery charge state includes:

[0034] In the case where the electric energy supply equipment includes a new energy generator set, the new energy generator set is controlled to reduce power output.

[0035] Therefore, in the presence of new energy units, the output of the new energy units can be reduced to perform frequency modulation to alleviate changes in the sending-end system and improve the stability of the sending-end system.

[0036] In some embodiments, controlling the power supply device of the sending-end system to perform frequency modulation based on the battery charge state includes:

[0037] In the case where the electric energy supply equipment includes a non-new energy generating set, the non-new energy generating set is controlled to reduce the power output.

[0038] Therefore, in the presence of non-new energy units, the power output of the non-new energy units is reduced to perform frequency modulation to alleviate changes in the sending-end system and improve the stability of the sending-end system.

[0039] In some embodiments, controlling the new energy generator set to reduce power output includes:

[0040] Control the new energy unit to operate in a load reduction operation mode.

[0041] Therefore, when the new energy units need to reduce their power output, the new energy units can be controlled to operate in load reduction mode. In the load reduction mode, the new energy stations operate at a lower power to alleviate the frequency fluctuations of the power grid and improve the stability of the sending-end system.

[0042] In some embodiments, the power supply device further includes the energy storage power station; and the power supply device of the sending-end system is controlled to perform a frequency modulation based on the battery charge state, further including:

[0043] When the battery state of charge is greater than or equal to a preset charge threshold, the energy storage power station is controlled not to change power.

[0044] Therefore, during a frequency modulation process, when the battery charge state is greater than or equal to the preset charge threshold, the energy storage power station is controlled to no longer change power, thereby reducing the impact of the charging and discharging process of the energy storage power station on the power of the grid and improving the stability of the sending-end system.

[0045] In some embodiments, the power supply device further includes the energy storage power station; and the power supply device of the sending-end system is controlled to perform a frequency modulation based on the battery charge state, further including:

[0046] When the battery state of charge is less than the preset charge threshold, the energy storage power station is controlled to absorb power.

[0047] Therefore, during a frequency modulation process, when the battery charge state is less than the preset charge threshold, the energy storage power station is controlled to absorb power, thereby reducing the power delivered to the grid, reducing power surplus and large losses due to frequency changes, and further improving the stability of the sending-end system.

[0048] In some embodiments, when the battery state of charge is less than the preset charge threshold, controlling the energy storage power station to absorb power includes:

[0049] Determining the maximum absorbable power of the energy storage power station based on the battery state of charge;

[0050] Based on the maximum absorbable power, the energy storage power station is controlled to absorb power.

[0051] Therefore, in the process of controlling the energy storage power station to absorb power, the energy storage power station is controlled to absorb power based on the maximum absorbable power, so that the energy storage power station can absorb power at the maximum absorbable power, so that the power change is as small as possible relative to the power loss of the sending-end system, and can be in an ideal minimum state, which can further reduce the fluctuation of the power change of the sending-end system and improve the stability of the sending-end system.

[0052] In some embodiments, the method further comprises:

[0053] When the DC power transmission system is successfully restarted, the power supply equipment of the sending-end system is controlled to restore power output, and the power supply equipment includes at least one of a new energy unit, a non-new energy unit and an energy storage power station.

[0054] Therefore, when the DC transmission system is successfully restarted after a commutation failure, it means that the problem of the commutation failure has been solved, so that the power supply equipment of the sending-end system is controlled to restore power output, so that the sending-end system is in a normal power supply state, thereby improving the performance of the power grid.

[0055] In some embodiments, the method further comprises:

[0056] When the number of restart failures of the DC power transmission system reaches a preset number, a DC blocking instruction is generated, and the corresponding new energy generating set to be cut off is cut off based on the DC blocking instruction.

[0057] Therefore, after the commutation failure, if the preset number of restarts of the DC transmission system fail, it means that the problem of commutation failure cannot be solved by restarting. Therefore, the corresponding new energy units to be cut off are cut off through the DC locking instruction, so that the frequency of the sending end system can be stabilized as soon as possible, thereby improving the performance of the power grid.

[0058] In a second aspect, the present application provides a control device for a delivery end system, the device comprising:

[0059] A frequency variation determination module is used to determine whether the frequency variation of the sending-end system exceeds a preset frequency variation range in the event of a commutation failure;

[0060] A strategy determination module, used to determine whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency change exceeds the preset frequency change range;

[0061] The processing module is used to execute a control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending-end system.

[0062] In a third aspect, the present application provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor implements the steps of the method in any one of the embodiments described above when executing the computer program.

[0063] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method in any one of the embodiments described above.

[0064] In a fifth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the method in any one of the embodiments described above.

[0065] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0067] Figure 1 A schematic diagram of the topological structure of a sending-end system involved in the method of the embodiment of the present application in some embodiments;

[0068] Figure 2 A schematic diagram of the topological structure of a sending-end system involved in the method of the embodiment of the present application in other embodiments;

[0069] Figure 3 A schematic diagram of the communication between the control main station and each substation in the sending end system in some embodiments;

[0070] Figure 4 A schematic flow chart of a control method of a delivery end system according to some embodiments of the present application;

[0071] Figure 5 A schematic flow chart of a control method of a delivery end system according to other embodiments of the present application;

[0072] Figure 6 A schematic flow chart of a control method of a delivery end system according to other embodiments of the present application;

[0073] Figure 7 A schematic flow chart of a control method of a delivery end system according to other embodiments of the present application;

[0074] Figure 8 Schematic diagram of the flow of the control method of the delivery end system in some specific embodiments of the present application;

[0075] Fig. 9 It is a structural block diagram of a control device of a sending-end system in some embodiments of the present application;

[0076] Fig.10 This is a diagram of the internal structure of an electronic device according to some embodiments of the present application. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0078] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0080] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0081] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0082] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0083] 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).

[0084] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0085] At present, the DC transmission system line is suitable for long-distance, high-power transmission due to its low cost, low loss, low operating cost, and reliable operation. Therefore, it has incomparable advantages over AC transmission in long-distance, high-capacity overhead transmission, grid interconnection, long-distance submarine cable transmission, and transmission with new energy. Through the DC transmission system, the output power of the sending-end system (also called the sending-end grid) can be transmitted to the receiving-end system (also called the receiving-end grid) through the DC transmission system, so that it can be transmitted over long distances. Under normal circumstances, the sending-end system refers to a power grid system whose total active power generation capacity is greater than the total load capacity, so that it has the ability to output active power to other power grids. The receiving-end system refers to a power grid system whose total active power generation capacity is less than the total load capacity and needs to receive the active power output of other power grids to meet the load demand.

[0086] In the embodiments of the present application, the sending-end system refers to a sending-end system arranged on land, which can generally include multiple power supply devices, which may include new energy stations, non-new energy units, and energy storage power stations, etc. The number of new energy stations may be one or more, and each new energy station may be provided with one or more new energy units, such as wind turbines and photovoltaic modules. Taking the example of a new energy station that is provided with both wind turbines and photovoltaic modules, and a non-new energy unit including a thermal power unit, the sending-end system can also be referred to as a wind, solar, thermal, and storage sending-end system. The wind, solar, thermal, and storage sending-end system provides electric energy to the DC transmission system, which is then provided to the receiving-end system by the DC transmission system.

[0087] For this type of sending-end system, due to the inherent defects of the thyristors in the DC transmission system, in the event of an AC / DC fault, it is easy to cause the commutation failure process of the conventional DC receiving-end converter valve. During the commutation failure, the DC voltage drops rapidly in a short period of time, resulting in the inability to output DC power normally. At the same time, in the case of multiple commutation failures, it is easy to trigger the DC blocking command, resulting in DC blocking, and DC blocking will lose a large amount of power transmission channels, resulting in power surplus in the sending-end system, rapid frequency increase, and new energy units disconnected from the grid. Therefore, how to reasonably design the power coordination control during the commutation failure, so as to transfer the power lost by the DC system and improve the frequency stability of the sending-end system during the transient period, is a technical problem that needs to be discussed and solved urgently.

[0088] After research, it was found that during the commutation failure, the frequency change of the sending-end system is not the same. Therefore, the frequency change of the sending-end system can be combined to determine whether it is necessary to cut off the new energy unit to maintain frequency stability. In this way, when it is determined based on the frequency change that the new energy unit does not need to be cut off, the control actions related to not cutting off the new energy unit can be executed to reduce the possibility of directly cutting off power during commutation failure, resulting in a large change in power, so as to improve stability during commutation failure.

[0089] Furthermore, with the continuous improvement of the capacity and voltage level of large-scale electrochemical energy storage power stations, the ability of energy storage power stations to provide support for power systems has been further enhanced. Therefore, energy storage power stations are usually installed in the sending-end system. Based on this, on the basis of the above method, the energy storage capacity of the energy storage power station can be further combined to reasonably allocate the power of the power supply equipment of the sending-end system (such as energy storage power stations, new energy stations, thermal power units, etc., which may be different based on the specific configuration of the sending-end system) to transfer the power lost by the DC system, improve the frequency stability of the sending-end system during transient periods, and buy more time for DC restart and recovery.

[0090] Take the example of the power supply equipment of the sending end system including energy storage power station, new energy station and thermal power unit. Figure 1 , Figure 2 As shown, the electric energy provided by the new energy station, the energy storage power station, and the thermal power unit is transmitted to the DC transmission system after being converged through the first bus, and the DC transmission system provides electric energy to the receiving-end power grid via the second bus. Among them, the new energy station, the thermal power unit and the energy storage power station together constitute the power supply equipment of the sending-end system to provide electric energy to the DC transmission system, and the DC transmission system transmits the electric energy to the receiving-end power grid. Among them, the power supply equipment can also provide electric energy for the local load of the sending-end system. The new energy station can be equipped with one or more new energy units (not shown in the figure), and the new energy station can generate new energy electricity through the new energy units.

[0091] Among them, the number and voltage level of new energy stations in the sending-end system, the number and voltage level of thermal power units, and the number and voltage level of energy storage power stations can be configured according to actual needs. Figure 2 As shown, in some embodiments, taking the low-voltage electric energy provided by the new energy station as an example, the electric energy provided by the new energy station can be converged through the low-voltage busbar, and then through the low-voltage / medium-voltage voltage level conversion, converged to the medium-voltage busbar, and then through the medium-voltage / high-voltage voltage level conversion, converged to the high-voltage busbar (such as Figure 1The first bus in the DC transmission system) is transmitted to the DC transmission system, which can be an ultra-high voltage transmission system, such as an ultra-high voltage bipolar DC transmission system. Taking the low-voltage power provided by the thermal power unit as an example, the power provided by the thermal power unit can be converted from low voltage to high voltage, converged to the high-voltage bus, and transmitted to the DC transmission system. Among them, after the power provided by the new energy station converges to the high-voltage bus, it can be further coupled to the energy storage power station for storage.

[0092] Among them, during the operation of the sending end system, the main station ( Figure 1 , Figure 2 (not shown) to control the working status of each device. Figure 3 As shown, the new energy site collection substation, thermal power unit, energy storage power station substation, etc. can send the detected or collected operation information to the control main station. The control main station can send control information to the new energy site collection substation, thermal power unit, or energy storage power station substation based on the collected operation information to control the working status of the new energy site, thermal power unit, and energy storage power station. Among them, the control main station can determine the control information to be sent based on the collected operation information, or it can send the collected operation information to the information substation and obtain the control information returned by the information substation based on the analysis of the operation information. For example, the control main station can exchange commutation failure information and DC locking information with the information substation, and determine the control information to be sent to the new energy site collection substation, thermal power unit, or energy storage power station substation based on this.

[0093] Among them, the new energy station collection substation can be one of multiple new energy stations, or it can be a device independent of the new energy station and capable of collecting the operating information of each new energy station. It serves as an intermediate device between each new energy station and the control master station to achieve communication between each new energy station and the control master station. The energy storage power station substation can be one of multiple energy storage power stations, or it can be a device independent of the energy storage power station and capable of collecting the operating information of each energy storage power station. It serves as an intermediate device between each energy storage power station and the control master station to achieve communication between each energy storage power station and the control master station.

[0094] The control master station may be implemented through a terminal, such as a personal computer, a laptop computer, an Internet of Things device, etc., or may be implemented through a server. The server may be implemented by an independent server or a server cluster composed of multiple servers.

[0095] refer to Figure 4 As shown, an embodiment of the present application provides a control method for a sending end system, the method comprising:

[0096] Step S100: in the event of a commutation failure, determining whether the frequency variation of the sending-end system exceeds a preset frequency variation range.

[0097] Commutation refers to the physical process of transferring the current flowing through the converter from one current path to another by opening and closing the converter valves in the converter during the operation of the converter. The converter may include multiple converter valves. Commutation failure refers to the failure of the current to smoothly transfer from one current path to the current path it needs to reach due to a fault during the commutation process.

[0098] Whether a commutation failure has occurred can be detected in various possible ways. For example, in some embodiments, the commutation valve current flowing through the commutation valve and the direct current between the sending-end system and the receiving-end system can be detected, and the commutation valve current and the direct current can be combined to determine whether a commutation failure has occurred. When the sending-end system is working normally, such as in a steady state, the commutation valve current flowing through the commutation valve and the direct current between the sending-end system and the receiving-end system should be consistent in theory. Considering the power consumption of the line itself, the difference between the commutation valve current and the direct current is also within an acceptable range. If a commutation failure occurs, the current on one side of the commutation valve will not be able to reach the other side smoothly, resulting in a significant decrease in the direct current between the sending-end system and the receiving-end system, thereby increasing the difference between the commutation valve current and the direct current. Therefore, whether a commutation failure has occurred can be determined by combining the difference between the commutation valve current and the direct current. For example, if the difference between the commutation valve current and the direct current is greater than the preset difference threshold, it can be determined that a commutation failure has occurred, otherwise, it is determined that no commutation failure has occurred.

[0099] The frequency change refers to the change in the frequency of the sending-end system, which can be the difference between the frequency value of the current scheduling cycle and the frequency value of the previous cycle.

[0100] The preset frequency variation range represents the range in which the frequency of the sending-end system can fluctuate. By setting the preset frequency variation range, frequency modulation control can be performed when the preset frequency variation range is exceeded, which can reduce the possibility of frequent frequency modulation control to maintain the stability of the sending-end system. By comparing the frequency variation with the preset frequency variation range to determine whether the frequency variation exceeds the preset frequency variation range, it can be determined whether the frequency fluctuation of the sending-end system exceeds the acceptable fluctuation range in the case of commutation failure.

[0101] Step S200: Based on the judgment result of whether the frequency variation exceeds the preset frequency variation range, determine whether to cut off part of the new energy units of the sending end system.

[0102] The result of judging whether the frequency variation exceeds the preset frequency variation range indicates whether the frequency fluctuation of the sending-end system exceeds the acceptable fluctuation range in the case of commutation failure, so as to determine whether it is necessary to cut off some new energy units. For example, under normal circumstances, if it exceeds the acceptable fluctuation range, it means that the frequency fluctuation is large, and some new energy units need to be cut off to quickly restore the frequency of the sending-end system to stability. If it does not exceed the acceptable fluctuation range, it means that the frequency fluctuation is small, and the corresponding control method can be sought without cutting off the new energy units to reduce the impact of directly cutting off the new energy units on the sending-end system.

[0103] Step S300: executing a control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending-end system.

[0104] In the case where it is determined that some of the new energy units in the sending end system need to be cut off, and in the case where it is determined that the new energy units in the sending end system do not need to be cut off, different control methods can be used for processing. For example, in the case where some of the new energy units in the sending end system need to be cut off, some of the new energy units are cut off.

[0105] Based on the control method of the sending-end system provided in the embodiment of the present application, when a commutation failure occurs, the power is not directly cut off. Instead, based on the judgment result of whether the frequency change of the sending-end system exceeds the preset frequency change direction, it is decided whether some new energy units of the sending-end system need to be cut off, and corresponding control actions are performed accordingly. That is, in the event of a commutation failure, the new energy units may not be directly cut off based on the frequency change situation, so as to improve the frequency stability of the power grid.

[0106] In some embodiments, the above step S200 determines whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency change exceeds the preset frequency change range, including:

[0107] When the frequency variation exceeds the preset frequency variation range, it is determined that part of the new energy units of the sending-end system needs to be cut off.

[0108] Therefore, when the frequency variation exceeds the preset frequency variation range, it indicates that the grid frequency fluctuates greatly, and it is determined that some new energy units need to be removed to reduce the frequency fluctuation of the sending-end system and improve the stability of the grid.

[0109] In some embodiments, the above step S200 determines whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency change exceeds the preset frequency change range, including:

[0110] When the frequency variation does not exceed the preset frequency variation range, it is determined that there is no need to cut off the new energy unit of the sending-end system.

[0111] Therefore, when the frequency change exceeds the preset frequency change range, it means that the frequency fluctuation is small, and not cutting off the new energy unit can meet the grid stability requirements to a certain extent. Not cutting off the new energy unit can also reduce the amplitude of power changes caused by directly cutting off the new energy unit, thereby further improving the stability of the grid.

[0112] refer to Figure 5 As shown, in some embodiments, the execution of the above step S300 and the control action corresponding to the judgment result of whether to cut off some new energy units of the sending end system include:

[0113] Step S311: when it is determined that some of the new energy units of the sending-end system need to be removed, the new energy units to be removed are determined based on the absorbable power of the energy storage power station and the loss power of the sending-end system.

[0114] The absorbable power of the energy storage station refers to the power that the energy storage station can further absorb, which can be determined based on the state of charge (SOC) of the energy storage station. The charge and discharge state is the state of charge, which reflects the remaining capacity of the energy storage station. Therefore, the charge and discharge state of the energy storage station reflects the remaining capacity of the energy storage station, based on which the power that the energy storage station can further absorb can be determined.

[0115] The power loss of the sending-end system refers to the power lost due to commutation failure, which may refer to the power lost in the DC line between the DC transmission system and the receiving-end system. Therefore, it may also be called the power loss of the DC line. The power loss may be determined in a combination of various possible ways, and the embodiments of the present application do not make specific limitations.

[0116] Step S312: Cut off the new energy generating set to be cut off, and control the energy storage power station to absorb power.

[0117] When controlling the energy storage power station to absorb power, the energy storage power station may be controlled to absorb power based on the absorbable power of the energy storage power station determined above, so as to maintain the performance of the energy storage power station.

[0118] Therefore, when it is determined that some new energy units need to be cut off, the new energy units to be cut off are determined by combining the absorbable power of the energy storage power station and the loss power of the sending-end system, and the new energy units are cut off accordingly, that is, the power of the cut new energy units is matched with the absorbable power of the energy storage power station and the loss power of the sending-end system. It can be combined with the absorbable power of the energy storage power station, so that when the absorbable power of the energy storage power station is taken into consideration, the power to be cut off can be reduced, thereby reducing the situation where the power of the sending-end system changes drastically due to the drastic cut of the power of the new energy units, and further improving the stability of the sending-end system.

[0119] In some embodiments, the above step S311 determines the new energy units to be removed based on the absorbable power of the energy storage power station and the power loss of the sending-end system, including:

[0120] Obtaining the absorbable power of the energy storage power station;

[0121] Determining the power to be cut off based on the difference between the loss power of the sending-end system and the absorbable power;

[0122] Based on the power to be removed, the new energy units to be removed are determined.

[0123] Among them, the difference between the loss power and the absorbable power of the sending-end system may refer to the value obtained by subtracting the absorbable power from the loss power of the sending-end system. When determining the power to be cut off, in some embodiments, the value obtained by subtracting the absorbable power from the loss power of the sending-end system may be directly used as the power to be cut off. In other embodiments, based on the difference obtained by subtracting the absorbable power from the loss power of the sending-end system, combined with the available power of each new energy unit, the available power closest to the difference may be determined as the power to be cut off. In other embodiments, it may also be determined in other ways, which are not specifically limited in the embodiments of the present application.

[0124] In the process of determining the new energy units to be removed based on the power to be removed, various possible methods can be combined for determination. For example, based on the available power of each new energy unit, the new energy unit whose available power is closest to the power to be removed is determined as the new energy unit to be removed. For another example, based on the available power of each new energy unit, multiple new energy units whose sum of available power is closest to the power to be removed are determined as the new energy units to be removed. In other embodiments, the new energy units to be removed can also be determined in other ways.

[0125] Therefore, the power to be cut off is determined by the difference between the power loss and the absorbable power of the sending-end system. On the basis of the power loss of the sending-end system, the energy storage power station absorbs part of the power, so that the actual power to be cut off is reduced relative to the power loss of the sending-end system. Therefore, after power cutting, the power change becomes smaller relative to the power loss of the sending-end system, which reduces the situation of large power changes in the sending-end system and improves the stability of the sending-end system.

[0126] In some embodiments, the absorbable power of the energy storage power station is the maximum absorbable power of the energy storage power station.

[0127] The maximum absorbable power of an energy storage power station refers to the power that the energy storage station can absorb based on the current SOC of the energy storage station when the energy storage of the energy storage station reaches the maximum energy storage threshold. That is, based on the current SOC of the energy storage station, after the energy storage station absorbs the maximum absorbable power, the energy storage of the energy storage station will reach the maximum energy storage threshold to maximize the use of the energy storage space of the energy storage station.

[0128] Therefore, by considering the maximum absorbable power of the energy storage power station, the energy storage power station can absorb power at the maximum absorbable power, so that the power change after power cut-off is as small as possible relative to the power loss of the sending-end system, and can be in an ideal minimum state, which can further reduce the amplitude of the power change of the sending-end system and improve the stability of the sending-end system.

[0129] In some embodiments, reference Figure 6 As shown, the control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending-end system in the above step S300 includes:

[0130] Step S321: when it is determined that there is no need to cut off the new energy generating set of the sending-end system, the battery charge state of the energy storage power station is obtained.

[0131] Step S321: Based on the battery charge state, the power supply device of the sending-end system is controlled to perform frequency modulation.

[0132] Therefore, without the need to cut off the new energy units of the sending-end system, the power supply equipment of the sending-end system can be controlled by the battery charge state of the energy storage power station to perform a frequency modulation. This can alleviate the frequency change of the sending-end system and improve the stability of the sending-end system.

[0133] In some embodiments, reference Figure 7 As shown, the execution of the control action corresponding to the judgment result of whether to cut off some of the new energy units of the sending-end system in the above step S300 may also include:

[0134] Step S323: when it is determined that there is no need to cut off the new energy generating set of the sending-end system, control the DC power transmission system to clear the fault and restart the DC power transmission system.

[0135] The method of controlling the DC power transmission system to clear faults and the method of restarting the DC power transmission system may be performed in combination with any existing method or any method that may appear in the future, and the embodiments of the present application are not limited thereto.

[0136] Therefore, without the need to cut off the new energy units of the sending-end system, the power loss caused by commutation failure can be solved by controlling the DC transmission system to clear the fault and restart it, thereby reducing the situation where the DC transmission system is continuously in a commutation failure state, resulting in DC locking, and then causing a large amount of power loss, so as to completely solve the problem of power loss caused by commutation failure in the sending-end system and further improve the stability of the sending-end system.

[0137] In some embodiments, the above step S322 of controlling the power supply device of the sending-end system to perform frequency modulation based on the battery charge state includes:

[0138] In the case where the electric energy supply equipment includes a new energy generator set, the new energy generator set is controlled to reduce power output.

[0139] Among them, power output refers to the power generated. Controlling the new energy units to reduce power output means controlling the power generated by the new energy units to reduce.

[0140] Therefore, in the presence of new energy units, the output of the new energy units is reduced by controlling the new energy units so that the power provided by the new energy units is reduced, thereby performing a frequency adjustment to alleviate changes in the sending-end system and improve the stability of the sending-end system.

[0141] There is no limitation on the method of controlling the new energy generator set to reduce the power output. In some embodiments, controlling the new energy generator set to reduce the power output includes:

[0142] Control the new energy unit to operate in a load reduction operation mode.

[0143] The load reduction operation mode refers to a mode in which the new energy station operates at a lower power, that is, the new energy station does not operate at full power. The specific load reduction method is not limited. Under the load reduction operation mode, the new energy station still has a power increase margin, that is, the power of the new energy station can be further increased.

[0144] Among them, before the phase change fails, the operating mode of the new energy station is not limited. For example, before the phase change fails, the new energy station may be in a load reduction operation mode. In this case, the new energy station can be maintained in the load reduction operation mode, and the operating power of the new energy station can be further reduced to further reduce the load. The embodiment of the present application is not limited.

[0145] For another example, before the commutation fails, the new energy station may be in the maximum power point tracking (MPPT) mode, where the maximum power point tracking refers to the ability to detect the power generation voltage in real time and track the highest voltage and current values, so that the system can generate electricity with the highest efficiency. In the maximum power point tracking mode, the new energy station can capture new energy resources to the greatest extent and increase the overall power. In this case, the new energy station can be controlled to switch from the MPPT mode to the load reduction operation mode to reduce power.

[0146] Therefore, when the new energy units need to reduce their power output, the new energy units can be controlled to operate in load reduction mode. In the load reduction mode, the new energy stations operate at a lower power to alleviate the frequency fluctuations of the power grid and improve the stability of the sending-end system.

[0147] In some embodiments, the above step S322 of controlling the power supply device of the sending-end system to perform frequency modulation based on the battery charge state includes:

[0148] In the case where the electric energy supply equipment includes a non-new energy generating set, the non-new energy generating set is controlled to reduce the power output.

[0149] A non-new energy unit refers to a unit that generates electricity by means other than new energy, for example, a unit that generates electricity by non-renewable energy, such as a thermal power unit. In the following embodiments of the application, thermal power units are used as examples for description.

[0150] Among them, power output refers to the power generated. Controlling non-new energy units to reduce power output means controlling the power generated by non-new energy units to reduce.

[0151] There is no limit to the way of controlling the non-new energy generating set to reduce the power output. For example, the power output of the non-new energy generating set can be reduced by controlling the speed governor of the non-new energy generating set.

[0152] Therefore, in the presence of non-new energy units, the power output of the non-new energy units is reduced to perform frequency modulation to alleviate changes in the sending-end system and improve the stability of the sending-end system.

[0153] In some embodiments, the power supply device further includes the energy storage power station; the step S322 of controlling the power supply device of the sending end system to perform frequency modulation based on the battery charge state further includes:

[0154] When the battery state of charge is greater than or equal to a preset charge threshold, the energy storage power station is controlled not to change power.

[0155] The preset charge threshold refers to the maximum charge amount that the energy storage station can store. When the battery charge state is greater than or equal to the preset charge threshold, it means that the storage space of the energy storage station is full and can no longer absorb power. If the energy storage station sends power outward, it will cause further changes in the frequency of the sending system, thereby affecting the stability of the sending system. By controlling the energy storage station to no longer change power, the impact of the power change of the energy storage station on the stability of the sending system can be reduced.

[0156] Therefore, during a frequency modulation process, when the battery charge state is greater than or equal to the preset charge threshold, the energy storage power station is controlled to no longer change power, thereby reducing the impact of the charging and discharging process of the energy storage power station on the power of the grid and improving the stability of the sending-end system.

[0157] In some embodiments, the power supply device further includes the energy storage power station; the above step S322 of controlling the power supply device of the sending end system to perform frequency modulation based on the battery charge state further includes:

[0158] When the battery state of charge is less than the preset charge threshold, the energy storage power station is controlled to absorb power.

[0159] Therefore, during a frequency modulation process, when the battery charge state is less than the preset charge threshold, the energy storage power station is controlled to absorb power, thereby reducing the power delivered to the grid, reducing power surplus and large losses due to frequency changes, and further improving the stability of the sending-end system.

[0160] In some embodiments, when the battery state of charge is less than the preset charge threshold, controlling the energy storage power station to absorb power includes:

[0161] Determining the maximum absorbable power of the energy storage power station based on the battery state of charge;

[0162] Based on the maximum absorbable power, the energy storage power station is controlled to absorb power.

[0163] Among them, controlling the energy storage power station to absorb power based on the maximum absorbable power means that the energy storage power station can absorb the maximum power value of the maximum absorbable power, that is, after absorbing the maximum absorbable power, the energy storage power station usually reaches the preset charge threshold.

[0164] Therefore, in the process of controlling the energy storage power station to absorb power, the energy storage power station is controlled to absorb power based on the maximum absorbable power, so that the energy storage power station can absorb power at the maximum absorbable power, so that the power change is as small as possible relative to the power loss of the sending-end system, and can be in an ideal minimum state, which can further reduce the fluctuation of the power change of the sending-end system and improve the stability of the sending-end system.

[0165] In some embodiments, the method further comprises:

[0166] When the DC power transmission system is successfully restarted, the power supply equipment of the sending-end system is controlled to restore power output, and the power supply equipment includes at least one of a new energy unit, a non-new energy unit and an energy storage power station.

[0167] Among them, controlling the power supply equipment of the sending-end system to restore power output may, in some embodiments, refer to controlling the power supply equipment of the sending-end system to restore to the state before the phase-change failure. For example, if the new energy station is in MPPT mode before the phase-change failure, it is restored to operate in MPPT mode. If the new energy unit is removed, the removed new energy unit is reconnected to restore the power supply of the new energy unit. In other embodiments, controlling the power supply equipment of the sending-end system to restore power output may also refer to increasing the power output of the sending-end system to increase the power of the sending-end system, and the specific method is not limited.

[0168] Therefore, when the DC transmission system is successfully restarted after a commutation failure, it means that the problem of the commutation failure has been solved, so that the power supply equipment of the sending-end system is controlled to restore power output, so that the sending-end system is in a normal power supply state, thereby improving the performance of the power grid.

[0169] In some embodiments, the method further comprises:

[0170] When the number of restart failures of the DC power transmission system reaches a preset number, a DC blocking instruction is generated, and the corresponding new energy generating set to be cut off is cut off based on the DC blocking instruction.

[0171] The specific value of the preset number is not limited. For example, the preset number can be set to 1, that is, after a commutation failure, as long as the restart fails, the DC blocking is performed. The preset number can also be set to a natural number greater than 1, that is, after a commutation failure, the DC blocking is performed only when multiple restart failures occur, so as to improve fault tolerance.

[0172] Therefore, after the commutation failure, if the preset number of restarts of the DC transmission system fail, it means that the problem of commutation failure cannot be solved by restarting. Therefore, the corresponding new energy units to be cut off are cut off through the DC locking instruction, so that the frequency of the sending end system can be stabilized as soon as possible, thereby improving the performance of the power grid.

[0173] Based on the above-mentioned embodiments, the control process of the sending end system in a specific scenario is described in detail below. Figure 8 As shown, the control method of the delivery end system in this embodiment includes the following steps.

[0174] Step S801: Detect the converter valve current and proceed to step S803.

[0175] Step S802: Detect direct current, where the direct current refers to the direct current between the sending-end system and the receiving-end system, and proceed to step S803.

[0176] There is no limit to the execution order of step S801 and step S802. Usually, they can be performed simultaneously, or the time difference between the two executions is within an acceptable time difference range, so as to obtain the converter valve current and the DC current at the same theoretical moment.

[0177] Step S803: Determine whether commutation failure occurs based on the converter valve current and the DC current. If commutation failure does not occur, proceed to step S804; if commutation failure occurs, proceed to step S805.

[0178] Wherein, when the difference between the converter valve current and the DC current is greater than a preset difference threshold, it is determined that the commutation failure has occurred; otherwise, it is determined that the commutation failure has not occurred.

[0179] Step S804: The sending-end system operates normally, that is, the sending-end system maintains the current operating state unchanged.

[0180] Step S805: Determine the frequency variation of the sending end system and determine whether the frequency variation exceeds a preset frequency variation range. If so, proceed to step S806 and step S807, otherwise, proceed to step S810 and step S811.

[0181] Step S806: Calculate the maximum power that can be absorbed by the energy storage station according to the SOC state of the energy storage station Proceed to step S808.

[0182] Step S807: Calculate the power loss ΔP of the sending end system loss , proceed to step S808.

[0183] There is no limit to the execution order of step S806 and step S807. Usually, they can be performed simultaneously, or the execution time difference between them is within an acceptable range, so as to obtain the maximum absorbable power and loss power at the same theoretical moment.

[0184] Step S808: Based on the maximum absorbable power And the power loss ΔP loss , get the power that needs to be removed And cut off the output power to If the new energy unit is selected, go to step S809.

[0185] Step S809: Cut off the output power The new energy unit achieves power flow balance and the sending end system returns to stability. It should be understood that in this stable state, the output power of the sending end system is less than the output power before the commutation failure.

[0186] Step S810: Control the DC power transmission system to clear the fault, activate the restart process of the DC power transmission system, restart the DC power transmission system, and enter step S814.

[0187] Step S811: Detect the SOC state of the energy storage power station. If the SOC is too large, that is, greater than or equal to the preset charge threshold, then proceed to step S812. If the SOC is normal or too small, for example, the SOC is less than the preset charge threshold, or the ratio of the difference between the preset charge threshold and the SOC to the preset charge threshold reaches the preset ratio, then proceed to step S813.

[0188] Step S812: Control the energy storage power station to not absorb power. At the same time, the new energy station exits the MPPT mode and enters the load reduction operation mode to reduce the power output, and controls the thermal power unit to reduce the output through the speed reducer to complete the primary frequency modulation process of the sending end system, and enter step S814.

[0189] Step S813: Calculate the maximum power that can be absorbed by the energy storage station according to the SOC state of the energy storage station Controlling the power absorption of energy storage power stations At the same time, the new energy station is controlled to exit the MPPT mode and enter the load reduction operation mode to reduce the power output, and the thermal power unit is controlled to reduce the output through the speed reducer to complete the primary frequency modulation process of the sending end system and enter step S814.

[0190] Step S814: Determine whether the DC line is restarted successfully. If the restart is successful, proceed to step S815. If the restart fails (if the preset number of times is greater than 1, the restart fails for the preset number of times in a row), proceed to step S816.

[0191] Step S815: Determine that there is no continuous commutation failure in the sending-end system, and the energy storage power station, new energy units and thermal power units resume output.

[0192] Step S816: Determine that a continuous commutation failure has occurred in the sending-end system, generate a DC blocking instruction (single-pole blocking or double-pole blocking), and enter steps S806 and S807 to cut off the new energy unit.

[0193] Based on the method of the embodiment described above, in the event of a commutation failure, the power output of the new energy stations, thermal power units, energy storage power stations, etc. of the sending-end system can be reasonably coordinated to transfer the power loss of the sending-end system, minimize the number of machine cuts, and prevent the sending-end system from losing steps due to power surplus, thereby buying more time for the DC system to restart and recover, improving the system frequency stability, and balancing the system stability and economic operation requirements.

[0194] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0195] Based on the same inventive concept, the embodiment of the present application also provides a control device for a delivery end system for implementing the control method for the delivery end system involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of the control device for one or more delivery end systems provided below can refer to the limitations of the control method for the delivery end system above, and will not be repeated here.

[0196] The present application also provides a control device for a delivery end system, referring to Fig. 9 As shown, the control device of the delivery end system in some embodiments includes:

[0197] The frequency variation determination module 901 is used to determine whether the frequency variation of the sending-end system exceeds a preset frequency variation range when a commutation failure occurs;

[0198] A strategy determination module 902 is used to determine whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency change exceeds the preset frequency change range;

[0199] The processing module 903 is used to execute a control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending-end system.

[0200] In some embodiments, the strategy determination module 902 is used to determine that part of the new energy units of the sending-end system need to be cut off when the frequency variation exceeds the preset frequency variation range.

[0201] In some embodiments, the strategy determination module 902 is used to determine that it is not necessary to cut off the new energy unit of the sending-end system when the frequency change does not exceed the preset frequency change range.

[0202] In some embodiments, the processing module 903 is used to determine the new energy units to be cut off based on the absorbable power of the energy storage power station and the loss power of the sending-end system when it is determined that some new energy units of the sending-end system need to be cut off; cut off the new energy units to be cut off, and control the power absorption of the energy storage power station.

[0203] In some embodiments, the processing module 903 is used to obtain the absorbable power of the energy storage power station; determine the power to be cut off based on the difference between the loss power of the sending end system and the absorbable power; and determine the new energy unit to be cut off based on the power to be cut off.

[0204] In some embodiments, the absorbable power of the energy storage power station is the maximum absorbable power of the energy storage power station.

[0205] In some embodiments, the processing module 903 is used to obtain the battery charge state of the energy storage power station when it is determined that there is no need to cut off the new energy unit of the sending-end system; and control the power supply equipment of the sending-end system to perform frequency modulation based on the battery charge state.

[0206] In some embodiments, the processing module 903 is used to control the DC power transmission system to clear the fault and restart the DC power transmission system when it is determined that there is no need to cut off the new energy generating unit of the sending-end system.

[0207] In some embodiments, the processing module 903 is used to control the new energy generator set to reduce power output when the power supply device includes a new energy generator set.

[0208] In some embodiments, the processing module 903 is used to control the non-new energy generating set to reduce power output when the power supply equipment includes a non-new energy generating set.

[0209] In some embodiments, the processing module 903 is used to control the new energy unit to operate in a load reduction mode to control the non-new energy unit to reduce power output.

[0210] In some embodiments, the processing module 903 is used to control the energy storage power station to no longer change power when the battery state of charge is greater than or equal to a preset charge threshold.

[0211] In some embodiments, the processing module 903 is used to control the energy storage power station to absorb power when the battery state of charge is less than the preset charge threshold.

[0212] In some embodiments, the processing module 903 is used to determine the maximum absorbable power of the energy storage station based on the battery state of charge; and control the energy storage station to absorb power based on the maximum absorbable power.

[0213] In some embodiments, the processing module 903 is also used to control the power supply equipment of the sending end system to restore power output when the DC transmission system is successfully restarted, and the power supply equipment includes at least one of a new energy unit, a non-new energy unit and an energy storage power station.

[0214] In some embodiments, the processing module 903 is further configured to generate a DC blocking instruction when the number of restart failures of the DC power transmission system reaches a preset number, and to cut off the corresponding new energy generating unit to be cut off based on the DC blocking instruction.

[0215] Each module in the control device of the above-mentioned sending end system can be implemented in whole or in part by software, hardware and their combination. Each module can be embedded in or independent of the processor in the electronic device in the form of hardware, or can be stored in the memory of the electronic device in the form of software, so that the processor can call and execute the corresponding operations of each module.

[0216] In one embodiment, an electronic device is provided. The electronic device may be a terminal, and its internal structure diagram may be as follows: Fig.10As shown. The electronic device includes a processor, a memory and a communication interface connected through a system bus, and may also include an input device. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the electronic device is used to communicate with external devices in a wired or wireless manner, for example, it can communicate with a new energy station converging substation, a thermal power unit, and an energy storage power station substation. The wireless method can be implemented through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a control method of a sending end system is implemented. The input device of the electronic device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the housing of the electronic device, or an external keyboard, touchpad or mouse.

[0217] Those skilled in the art will understand that Fig.10 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0218] In one embodiment, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the steps of the control method of the sending end system in any of the embodiments described above are implemented.

[0219] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the sending-end system in any of the embodiments described above are implemented.

[0220] In one embodiment, a computer program product or computer program is provided, the computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the steps of the control method of the sending end system of any of the above embodiments.

[0221] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0222] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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. A control method for a sending end system, characterized in that: The method comprises: In the event of a commutation failure, determining whether the frequency variation of the sending-end system exceeds a preset frequency variation range; Based on the judgment result of whether the frequency variation exceeds the preset frequency variation range, determining whether to cut off part of the new energy units of the sending end system; Execute a control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending-end system.

2. The method according to claim 1, characterized in that: The determining whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency change exceeds the preset frequency change range includes at least one of the following two items: When the frequency variation exceeds the preset frequency variation range, determining that part of the new energy units of the sending end system need to be removed; When the frequency variation does not exceed the preset frequency variation range, it is determined that there is no need to cut off the new energy unit of the sending-end system.

3. The method according to claim 1 or 2, characterized in that: The executing of the control action corresponding to the determination result of whether to cut off some of the new energy units of the sending-end system includes: In the case where it is determined that some of the new energy units of the sending-end system need to be removed, the new energy units to be removed are determined based on the absorbable power of the energy storage power station and the loss power of the sending-end system; The new energy generating set to be cut off is cut off, and the power absorption of the energy storage power station is controlled.

4. The method according to claim 3, characterized in that The determining of the new energy generating units to be removed based on the absorbable power of the energy storage power station and the loss power of the sending-end system includes: Obtaining the absorbable power of the energy storage power station; Determining the power to be cut off based on the difference between the loss power of the sending-end system and the absorbable power; Based on the power to be removed, the new energy units to be removed are determined.

5. The method according to claim 3 or 4, characterized in that: The absorbable power of the energy storage power station is the maximum absorbable power of the energy storage power station.

6. The method according to any one of claims 1 to 5, characterized in that: The executing of the control action corresponding to the determination result of whether to cut off some of the new energy units of the sending-end system includes: When it is determined that there is no need to cut off the new energy generating unit of the sending-end system, obtaining the battery charge state of the energy storage power station; Based on the battery charge state, the power supply equipment of the sending end system is controlled to perform frequency modulation.

7. The method according to claim 6, characterized in that The method further comprises: When it is determined that there is no need to cut off the new energy generating set of the sending-end system, the DC power transmission system is controlled to clear the fault and restart the DC power transmission system.

8. The method according to claim 6 or 7, characterized in that: The controlling the power supply device of the sending-end system to perform frequency modulation based on the battery charge state includes at least one of the following: In the case where the electric energy supply equipment includes a new energy generator set, controlling the new energy generator set to reduce power output; In the case where the electric energy supply equipment includes a non-new energy generating set, the non-new energy generating set is controlled to reduce the power output.

9. The method according to claim 8, characterized in that The controlling the new energy unit to reduce power output includes: Control the new energy unit to operate in a load reduction operation mode.

10. The method according to claim 8 or 9, characterized in that: The power supply device further includes the energy storage power station; the power supply device of the sending end system is controlled to perform a frequency modulation based on the battery charge state, and further includes at least one of the following items: When the battery state of charge is greater than or equal to a preset charge threshold, controlling the energy storage power station to no longer change power; When the battery state of charge is less than the preset charge threshold, the energy storage power station is controlled to absorb power.

11. The method according to claim 10, characterized in that When the battery state of charge is less than the preset charge threshold, controlling the energy storage power station to absorb power includes: Determining the maximum absorbable power of the energy storage power station based on the battery state of charge; Based on the maximum absorbable power, the energy storage power station is controlled to absorb power.

12. The method according to any one of claims 7 to 11, characterized in that: The method further comprises at least one of the following: When the DC power transmission system is successfully restarted, controlling the power supply equipment of the sending-end system to restore power output, wherein the power supply equipment includes at least one of a new energy unit, a non-new energy unit, and an energy storage power station; When the number of restart failures of the DC power transmission system reaches a preset number, a DC blocking instruction is generated, and the corresponding new energy generating set to be cut off is cut off based on the DC blocking instruction.

13. A control device for a delivery end system, characterized in that: The device comprises: A frequency variation determination module is used to determine whether the frequency variation of the sending-end system exceeds a preset frequency variation range in the event of a commutation failure; A strategy determination module, used to determine whether to cut off part of the new energy units of the sending end system based on the judgment result of whether the frequency change exceeds the preset frequency change range; The processing module is used to execute a control action corresponding to the judgment result of whether to cut off part of the new energy units of the sending-end system.

14. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 12 are implemented.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 12 are implemented.

16. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 12 are implemented.

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