Alternating current energy consumption device control method and system, electronic equipment and medium

Abstract

The invention relates to the technical field of alternating-current energy consumption devices, and discloses an alternating-current energy consumption device control method and system, electronic equipment and a medium. According to the method, operation fault state data of a direct-current power transmission system is monitored, the input group number of the alternating-current energy consumption devices is determined according to an alternating-current energy consumption device input and output strategy through the operation fault state data, and the input group number of the alternating-current energy consumption devices is determined; and issuing the switching operation instruction to the AC energy consumption device for switching control until the fault ride-through of the DC power transmission system is successful, and reducing the transient active power surplus of the DC power transmission system and suppressing the AC / DC overvoltage during the fault period of the transmitting and receiving end power grid or the DC system through rapidly switching the AC energy consumption device.

Description

Technical Field

[0001] The present invention relates to the technical field of AC energy consuming devices, and in particular to an AC energy consuming device control method, system, electronic equipment and medium. Background Art

[0002] Ultra-high voltage flexible direct current transmission is an important means to realize large-scale new energy base transmission due to its advantages such as flexible control and voltage support for island systems. The sending end of the flexible direct current transmission system of large-scale new energy base is a 100% power electronic system, which has the characteristics of wide power distribution range, fast power fluctuation, low short-circuit capacity, and poor anti-interference. The overvoltage problem caused by the AC fault in the sending end system is a major challenge threatening the safe operation of the system. During the fault period, both new energy and flexible direct current enter the low voltage ride-through mode, actively injecting reactive current to support the system voltage recovery. When the fault is restored, the system will face reactive power surplus; at the same time, the flexible direct current transmission channel is interrupted in the event of a serious fault, further facing the problem of active power surplus, and then causing AC overvoltage under the action of active power and reactive power surplus. Both new energy inverters and flexible direct current converters are power electronic equipment with high sensitivity to AC overvoltage. If the AC overvoltage is not suppressed in time, the sending end system will be at risk of AC fault ride-through failure protection disconnection, which seriously restricts the transmission capacity of large-scale new energy direct current transmission system.

[0003] When large-scale renewable energy is transmitted via flexible direct current, the flexible direct current system usually needs to adopt a UHV bipolar high-low valve group series structure. Faults such as the receiving-end AC grid fault, DC transmission line fault, DC unipolar or single valve group lockout may cause power surplus at the sending end. Configuring AC energy consumption devices is an effective means to balance the power surplus at the sending end. The existing AC energy consumption device input criteria are mainly derived from the DC converter lockout signal, DC line fault signal, DC voltage overvoltage and DC power surplus, in order to deal with the problem of active power surplus at the sending end caused by DC lockout, DC line fault, receiving-end AC grid fault, etc., but it is difficult to suppress the AC overvoltage during the AC grid fault at the sending end. Summary of the invention

[0004] In view of this, the present invention provides an AC energy consumption device control method, system, electronic device and medium, which solve the technical problem of difficulty in suppressing AC overvoltage during a sending-end AC power grid fault.

[0005] A first aspect of the present invention provides a method for controlling an AC energy consuming device, comprising:

[0006] Real-time monitoring of the operating fault status data of the DC transmission system to which the DC converter is connected;

[0007] Based on a preset AC energy consumption device launch and retreat strategy, determining the launch and retreat operation instructions of the AC energy consumption device according to the operation fault state data, wherein the launch and retreat operation instructions include the number of groups of AC energy consumption devices corresponding to the operation fault state data to be launched;

[0008] The switching operation instruction is sent to the AC energy consuming device for switching on and off control until the fault of the DC power transmission system is successfully crossed and the AC energy consuming device is switched off.

[0009] Preferably, the operation fault status data includes a blocking signal of the DC power transmission system;

[0010] The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, wherein the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be put into operation, including:

[0011] When the DC power transmission system is detected to be a blocking signal, the number of groups of AC energy consumption devices to be put into operation is determined according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption device;

[0012] The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

[0013] Preferably, the operation fault state data includes a DC line fault signal of the DC power transmission system;

[0014] The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, wherein the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be put into operation, including:

[0015] In the case where the DC power transmission system is monitored to have a DC line fault signal, determining the number of groups of AC energy consumption devices to be put into operation according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption device;

[0016] The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

[0017] Preferably, the operation fault status data includes a DC voltage of the DC power transmission system;

[0018] The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, wherein the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be put into operation, including:

[0019] In the case where the DC voltage of the DC power transmission system is monitored to be overvoltage, the number of groups of the AC energy consumption devices to be put into operation is determined according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption devices;

[0020] The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

[0021] Preferably, the operation fault state data includes the AC bus voltage of the converter station of the DC power transmission system;

[0022] The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, wherein the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be put into operation, including:

[0023] When it is detected that the AC bus voltage of the converter station is less than a preset AC voltage threshold, the expected total input capacity of the AC energy consuming device is determined according to the AC bus voltage of the converter station;

[0024] Determining the number of groups of the AC energy consuming devices to be put into operation according to the expected total capacity of the AC energy consuming devices and the active power of the AC energy consuming devices;

[0025] The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

[0026] Preferably, the operation fault state data includes the AC bus voltage and voltage change rate of the converter station of the DC power transmission system;

[0027] The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, wherein the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be put into operation, including:

[0028] When it is detected that the AC bus voltage of the converter station is greater than a preset AC voltage threshold and the voltage change rate is greater than a preset voltage change threshold, the expected total input capacity of the AC energy consumption device is determined according to the AC bus voltage of the converter station;

[0029] Determining the number of groups of the AC energy consuming devices to be put into operation according to the expected total capacity of the AC energy consuming devices and the active power of the AC energy consuming devices;

[0030] The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

[0031] Preferably, the operation fault state data includes the voltage value of the three-phase six-bridge arm submodule of the converter valve of the sending-end flexible DC converter station of the DC power transmission system;

[0032] The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, wherein the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be put into operation, including:

[0033] When it is detected that the voltage value of the three-phase six-bridge arm submodule of the converter valve is greater than a preset voltage threshold, the expected total input capacity of the AC energy consumption device is determined according to the voltage value of the three-phase six-bridge arm submodule of the converter valve;

[0034] Determining the number of groups of the AC energy consuming devices to be put into operation according to the expected total capacity of the AC energy consuming devices and the active power of the AC energy consuming devices;

[0035] The switching on and off operation instructions of the AC energy consuming device are generated according to the number of switching on and off groups of the AC energy consuming device and the preset switching on and off delays.

[0036] Preferably, the method further comprises:

[0037] When the operation fault status data is of multiple data types, the maximum number of activation groups of the AC energy consuming device is screened out based on the preset activation and deactivation strategy of the AC energy consuming device, and activation and deactivation operation instructions of the AC energy consuming device are determined.

[0038] In a second aspect, the present application also provides an AC energy consuming device control system, comprising:

[0039] A data monitoring module, used for real-time monitoring of the operating fault status data of the DC power transmission system to which the DC converter is connected;

[0040] A switch-on / off instruction generating module, used to determine the switch-on / off operation instruction of the AC energy consuming device according to the operation fault state data based on the preset switch-on / off strategy of the AC energy consuming device, wherein the switch-on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be switched on;

[0041] The switching control module is used to send the switching operation instruction to the AC energy consuming device for switching control until the fault of the DC power transmission system is successfully crossed and the AC energy consuming device is switched off.

[0042] In a third aspect, the present application further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method for controlling an AC energy consuming device as described in the first aspect.

[0043] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the steps of the method for controlling an AC energy consuming device as described in the first aspect are implemented.

[0044] It can be seen from the above technical solutions that the present invention monitors the operation fault status data of the DC transmission system, uses the operation fault status data in the AC energy consumption device switching strategy, determines the number of switching groups of the AC energy consumption device, and sends the switching operation instructions to the AC energy consumption device for switching control until the fault crossing of the DC transmission system is successful. By quickly switching on the AC energy consumption device, the transient active power surplus of the DC transmission system is reduced, and the AC and DC overvoltages during the fault of the sending and receiving end power grid or the DC system are suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 An application environment of an AC energy consumption device control method provided by an embodiment of the present invention;

[0046] Figure 2 A flow chart of a method for controlling an AC energy consuming device provided by an embodiment of the present invention;

[0047] Figure 3 A simplified structural diagram of a direct current transmission system provided by an embodiment of the present invention;

[0048] Figure 4 A detailed structural diagram of a DC power transmission system provided by an embodiment of the present invention;

[0049] Figure 5 A schematic diagram of the structure of an AC energy consumption device of a flexible DC power transmission system provided by an embodiment of the present invention;

[0050] Figure 6 A comparison diagram of the AC bus voltage of the converter station before and after the AC energy consumption device provided in the embodiment of the present invention is put into use;

[0051] Figure 7 A schematic diagram of the structure of a control system for an AC energy consuming device provided by an embodiment of the present invention;

[0052] Figure 8 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0053] 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 are within the scope of protection of the present invention.

[0054] The AC energy consumption device control method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, each device node of the DC transmission system communicates with the server 102 through the network. The data storage system can store the data that the server 102 needs to process. The data storage system can be integrated on the server 102, or it can be placed on the cloud or other network servers. The server 102 can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0055] like Figure 2 As shown, the embodiment of the present application provides a method for controlling an AC energy consuming device, and the method is applied to Figure 1 The server 102 in the example is used as an example to illustrate the method, which includes the following steps S1 to S3. Among them:

[0056] Step S1: monitoring in real time the operating fault status data of the DC power transmission system to which the DC converter is connected.

[0057] Among them, Figure 3~4 The structure of the DC transmission system shown in the figure is to configure an AC energy consumption device at the AC bus of the sending-end converter station of the DC transmission system to cope with the power surplus problem caused by the AC grid fault at the receiving end of the large-scale new energy flexible DC transmission system, the AC grid fault at the sending end, the DC transmission line fault, the DC single-pole / single valve group locking and other faults.

[0058] The number of groups of energy consumption devices is:

[0059]

[0060] Where N t The number of groups configured for energy consumption devices, P Rt is the total capacity of the energy consumption device, P Rs It is the capacity of a single group of energy consuming devices.

[0061] Among them, the connection methods of AC energy consumption devices and DC transmission systems can be divided into two technical routes: direct hanging type and transformer type. The direct hanging type AC energy consumption device is directly connected to the AC busbar on the grid side of the transformer at the DC transmission system sending end converter station. The transformer type AC energy consumption device is connected to the AC busbar on the grid side of the transformer at the DC transmission system sending end converter station through a transformer.

[0062] AC energy consumption device configuration location Figure 3 As shown, Figure 3 Middle U s is the AC bus voltage of the sending-end flexible DC converter station, U c is the AC valve side voltage of the sending-end flexible DC converter station, I s It is the current flowing from the sending-end flexible DC converter station to the AC system.

[0063] The operating fault status data refers to the fault status data when a fault occurs in the AC power grid at the sending end of the flexible DC transmission system.

[0064] Step S2: Based on the preset AC energy consuming device startup and shutdown strategy, the startup and shutdown operation instructions of the AC energy consuming device are determined according to the operation fault status data, and the startup and shutdown operation instructions include the number of groups of AC energy consuming devices corresponding to the startup and shutdown operation fault status data.

[0065] Among them, the AC energy consumption device activation and deactivation strategy is determined according to the operation fault status data. Different types of operation fault status data have different AC energy consumption device activation and deactivation strategies to deal with the problem of active power surplus at the sending end caused by DC blocking, DC line fault, AC power grid fault at the receiving end, etc.

[0066] The number of groups of AC energy consuming devices corresponding to the operational fault state data is obtained according to the active power surplus determined by the operational fault state data.

[0067] Step S3: Send the start / stop operation instruction to the AC energy consumption device for start / stop control until the fault of the DC power transmission system is successfully crossed and the AC energy consumption device is shut down.

[0068] It should be noted that the embodiment of the present application monitors the operating fault status data of the DC transmission system, uses the operating fault status data in the AC energy consuming device switching strategy, determines the number of switched groups of the AC energy consuming device, and sends the switching operation instructions to the AC energy consuming device for switching control until the fault of the DC transmission system is successfully crossed. By quickly switching on the AC energy consuming device, the transient active power surplus of the DC transmission system is reduced, and the AC and DC overvoltages during the fault of the sending and receiving end power grid or the DC system are suppressed.

[0069] It is worth noting that the suppression strategy proposed in the present invention is also effective for sending-end overvoltage problems caused by other fault types in the DC system.

[0070] In some embodiments, the operational fault status data includes a blocking signal of the DC transmission system.

[0071] The locking signal includes a single-pole locking signal and a single-valve group locking signal.

[0072] In some embodiments, based on the operation fault state data including a blocking signal of a DC power transmission system, based on a preset AC energy consumption device throw-in and throw-out strategy, an AC energy consumption device throw-in and throw-out operation instruction is determined according to the operation fault state data, and the throw-in and throw-out operation instruction includes the number of groups of AC energy consumption devices corresponding to the thrown-in operation fault state data, including:

[0073] Step S201: when a blocking signal is detected in the DC power transmission system, the number of AC energy consumption devices to be put into operation is determined according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption devices.

[0074] Among them, the energy consumption devices are put into operation according to the surplus power of the DC transmission system when the DC transmission system is in the blocking signal, and the number of AC energy consumption devices put into operation is:

[0075]

[0076] In the formula, N is the number of input groups, P B is the active power delivered by the DC transmission system before the fault, P A1 is the total rated active power transmitted by the non-fault valve groups of the flexible DC converter station after the fault of the DC transmission system, P R It is the rated power of a single group of energy consuming devices.

[0077] Step S202: generating on / off operation instructions for the AC energy consuming devices according to the number of on-board groups of the AC energy consuming devices.

[0078] In some embodiments, the operation fault status data includes a DC line fault signal of the DC power transmission system.

[0079] Based on the operation fault state data including a DC line fault signal of the DC power transmission system, based on a preset AC energy consumption device throw-in and throw-out strategy, the throw-in and throw-out operation instructions of the AC energy consumption device are determined according to the operation fault state data, and the throw-in and throw-out operation instructions include the number of groups of AC energy consumption devices corresponding to the thrown-in operation fault state data, including:

[0080] Step S211: when a DC line fault signal is detected in the DC transmission system, the number of AC energy consumption devices to be put into operation is determined according to the active power transmitted by the DC transmission system before the fault, the change in active power surplus after the fault, and the active power of the AC energy consumption devices.

[0081] Among them, when the DC line fault signal is a single-pole DC line fault, the number of AC energy-consuming devices put into operation is:

[0082]

[0083] Where P A2 It is the rated active power transmitted to the non-fault poles of the flexible DC converter station of the DC transmission system after a fault.

[0084] When the DC line fault signal is a bipolar DC line fault, the number of AC energy consumption devices put into operation is:

[0085]

[0086] Step S212: generating on / off operation instructions for the AC energy consuming devices according to the number of on-board groups of the AC energy consuming devices.

[0087] In some embodiments, the operational fault status data includes a DC voltage of the DC transmission system;

[0088] Based on the operation fault state data including the DC voltage of the DC power transmission system and the preset AC energy consumption device switching strategy, the switching operation instruction of the AC energy consumption device is determined according to the operation fault state data. The switching operation instruction includes the number of groups of AC energy consumption devices corresponding to the switching operation fault state data, including:

[0089] Step S221: when the DC voltage of the DC power transmission system is monitored to be over-voltage, the number of AC energy consumption devices to be put into operation is determined according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption devices.

[0090] Among them, when the single-pole DC overvoltage occurs, the number of AC energy-consuming devices put into operation is:

[0091]

[0092] Where, P A3 It is the rated active power transmitted by the HVDC transmission system at the flexible HVDC converter station after a fault without causing HVDC overvoltage.

[0093] When bipolar DC overvoltage occurs, the number of AC energy consumption devices put into operation is:

[0094]

[0095] Step S222: Generate on / off operation instructions for the AC energy consuming devices according to the number of on-board groups of the AC energy consuming devices.

[0096] In some embodiments, the operation fault status data includes an AC bus voltage of a converter station of the DC transmission system.

[0097] Wherein, based on the operation fault state data including the AC bus voltage of the converter station of the DC transmission system, based on the preset AC energy consumption device throw-in and throw-out strategy, the throw-in and throw-out operation instructions of the AC energy consumption device are determined according to the operation fault state data, and the throw-in and throw-out operation instructions include the number of groups of AC energy consumption devices corresponding to the thrown-in operation fault state data, including:

[0098] Step S231: when it is detected that the AC bus voltage of the converter station is less than a preset AC voltage threshold, the expected total capacity of the AC energy consuming device is determined according to the AC bus voltage of the converter station.

[0099] Among them, a mapping relationship can be constructed through the historical sample data of the AC bus voltage of the converter station and the historical sample data of the expected total capacity of the AC energy consuming devices, and formed into a mapping chart. After obtaining the AC bus voltage of the converter station, the expected total capacity of the AC energy consuming devices corresponding to the AC bus voltage of the converter station can be found through the mapping chart.

[0100] Step S232: Determine the number of AC energy consumption device input groups according to the expected total input capacity of the AC energy consumption device and the active power of the AC energy consumption device.

[0101] Among them, the number of AC energy consumption devices put into use is:

[0102] Where P B1 The expected total input capacity of AC energy consuming devices.

[0103] Step S233: generating the switching operation instructions of the AC energy consuming devices according to the number of switched groups of the AC energy consuming devices.

[0104] Among them, when it is detected that the AC bus voltage of the converter station is lower than the preset AC voltage threshold, the AC energy consumption device is put into operation until the AC bus voltage of the converter station recovers to within the specified range of AC voltage, and then the AC energy consumption device is exited after a certain delay.

[0105] In some embodiments, the operational fault status data includes the AC bus voltage and voltage change rate of a converter station of the DC power transmission system;

[0106] Based on the preset AC energy consumption device launch and retreat strategy, the launch and retreat operation instructions of the AC energy consumption device are determined according to the operation fault state data. The launch and retreat operation instructions include the number of groups of AC energy consumption devices corresponding to the launch and retreat operation fault state data, including:

[0107] Step S241: when it is detected that the AC bus voltage of the converter station is greater than a preset AC voltage threshold and the voltage change rate is greater than a preset voltage change threshold, the expected total input capacity of the AC energy consuming device is determined according to the AC bus voltage of the converter station;

[0108] Step S242: Determine the number of AC energy consumption device input groups according to the expected total input capacity of the AC energy consumption device and the active power of the AC energy consumption device.

[0109] Among them, the number of AC energy consumption devices put into use is:

[0110] Where P B1 The expected total input capacity of AC energy consuming devices.

[0111] Step S243: generating on / off operation instructions for the AC energy consuming devices according to the number of on-board groups of the AC energy consuming devices.

[0112] Exemplarily, when the AC voltage of the converter station is greater than the specified AC voltage threshold and the voltage change rate is greater than 0, the AC energy consumption device is put into operation. When the AC voltage of the converter station is less than the specified AC voltage threshold and the voltage change rate is less than 0, the energy consumption device is exited after a delay. In order to avoid the problem of repeated switching on and off of the energy consumption device and the problem of untimely exit, the two AC voltage specified thresholds are usually not equal.

[0113] The number of AC energy-consuming devices put into operation is determined by the AC voltage, and the mapping relationship between the AC voltage and the total capacity of the AC energy-consuming devices expected to be put into operation is designed. When the AC energy-consuming devices are withdrawn, they are withdrawn in sequence at a preset rate, thereby avoiding the huge impact on the system caused by the withdrawal of the energy-consuming devices too quickly.

[0114] In some embodiments, the operation fault state data includes voltage values ​​of three-phase six-bridge arm submodules of converter valves of a sending-end flexible DC converter station of a DC power transmission system;

[0115] Based on the preset AC energy consumption device launch and retreat strategy, the launch and retreat operation instructions of the AC energy consumption device are determined according to the operation fault state data. The launch and retreat operation instructions include the number of groups of AC energy consumption devices corresponding to the launch and retreat operation fault state data, including:

[0116] Step S251: when it is detected that the voltage value of the three-phase six-bridge arm submodule of the converter valve is greater than a preset voltage threshold, the expected total input capacity of the AC energy consumption device is determined according to the voltage value of the three-phase six-bridge arm submodule of the converter valve;

[0117] Step S252, determining the number of AC energy consumption devices put into operation according to the expected total capacity of the AC energy consumption devices and the active power of the AC energy consumption devices;

[0118] Step S253: generating the switching operation instructions of the AC energy consuming device according to the number of switching groups of the AC energy consuming device and the preset switching delay.

[0119] For example, the average voltage U of the three-phase six-bridge arm submodule of the flexible DC converter station at the sending end is obtained by sampling sm .

[0120] When the average submodule voltage U sm Greater than the preset threshold U sm _set1 After the preset delay t3, the AC energy consumption device is put into operation. sm Less than the preset threshold U sm _set2 After a preset delay t4, the energy-consuming device exits. To avoid repeated switching and untimely exit of the energy-consuming device, the threshold U sm _set1 Not equal to threshold U sm _set2 .

[0121] The number of AC energy-consuming devices put into operation is determined by the submodule voltage. The mapping relationship between the average submodule voltage and the total capacity of the AC energy-consuming devices expected to be put into operation is designed, and the number of energy-consuming devices put into operation is calculated by the following formula. When the AC energy-consuming devices are withdrawn, they are withdrawn in sequence at a preset rate, thereby avoiding the huge impact on the system caused by the energy-consuming devices withdrawing too quickly.

[0122]

[0123] Where P B2 is the total capacity of AC energy-consuming devices expected to be put into use, P B2 According to its average voltage U sm The size mapping relationship is obtained by looking up the table.

[0124] In some embodiments, all the investment and withdrawal strategies calculate the number of groups that need to be invested according to the signals collected by themselves, and it is not necessary to verify whether the number of groups invested meets the actual demand. Therefore, the method further includes:

[0125] When the operation fault status data is of multiple data types, the maximum number of activation groups of the AC energy consuming device is screened out based on the preset activation and deactivation strategy of the AC energy consuming device, and activation and deactivation operation instructions of the AC energy consuming device are determined.

[0126] Among them, the data types include the locking signal of the DC transmission system, the DC line fault signal, the DC voltage of the DC transmission system, the AC bus voltage of the converter station, the AC bus voltage and voltage change rate of the converter station of the DC transmission system, and the voltage value of the three-phase six-bridge arm submodule of the converter valve of the sending-end flexible DC converter station of the DC transmission system.

[0127] If the operation fault status data is of multiple data types, the maximum number of activated groups of the AC energy consuming device is selected to determine the activation and deactivation operation instructions of the AC energy consuming device.

[0128] The following is a calculation example verification of the AC energy consuming device control method proposed in the embodiment of the present application.

[0129] like Figure 5 Taking the kilowatt-level large-scale new energy flexible direct current transmission system as an example, the effectiveness of the method proposed in the present invention is verified. The new energy station (including wind farms, photovoltaic stations and energy storage systems) is connected to the sending-end flexible direct current converter station through an AC line. The sending-end flexible direct current converter station is equipped with 12 groups of AC energy-consuming devices on the AC side, of which 3 groups of AC energy-consuming devices and an energy-consuming transformer constitute a large group of energy-consuming devices. The sending-end flexible direct current converter station is connected to the receiving-end converter station through a DC line. The capacity of a single group of energy-consuming devices is 500MW, and the total capacity is 6000MW. The method proposed in the present invention is used to control the switching on and off of the AC energy-consuming devices. Figure 6 As shown, the AC energy consuming device control method proposed in the embodiment of the present application is used to control the switching on and off of the AC energy consuming device. When a three-phase short circuit fault occurs in the sending-end AC system, the AC energy consuming device can effectively suppress the AC overvoltage in the fault recovery interval after it is switched on.

[0130] Based on the same inventive concept, an embodiment of the present application further provides an AC energy consuming device control system for implementing the above-mentioned AC energy consuming device control method.

[0131] The implementation solution provided by the system to solve the problem is similar to the implementation solution recorded in the above method, so the specific limitations in one or more AC energy consuming device control system embodiments provided below can refer to the limitations on the AC energy consuming device control method above, and will not be repeated here.

[0132] like Figure 7 As shown, the embodiment of the present application provides an AC energy consuming device control system, including:

[0133] The data monitoring module 100 is used to monitor in real time the operating fault status data of the DC power transmission system to which the DC converter is connected;

[0134] The on / off instruction generating module 200 is used to determine the on / off operation instruction of the AC energy consuming device according to the operation fault state data based on the preset on / off strategy of the AC energy consuming device, and the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data;

[0135] The switching control module 300 is used to send switching operation instructions to the AC energy consumption device for switching control until the fault riding of the DC power transmission system is successful and the AC energy consumption device is switched off.

[0136] In some embodiments, the operational fault status data includes a blocking signal of the DC transmission system.

[0137] The switching instruction generation module 200 is used to determine the number of switching groups of AC energy consuming devices according to the active power transmitted by the DC transmission system before the fault, the change in active power surplus after the fault, and the active power of the AC energy consuming devices when the DC transmission system is monitored to be a locking signal; and generate switching operation instructions for the AC energy consuming devices according to the number of switching groups of the AC energy consuming devices.

[0138] In some embodiments, the operation fault status data includes a DC line fault signal of the DC power transmission system.

[0139] The switching instruction generation module 200 is used to determine the number of switching groups of AC energy consuming devices according to the change in active power surplus of the DC transmission system before and after the fault and the active power of the AC energy consuming devices when a DC line fault signal is detected in the DC transmission system; and generate switching operation instructions for the AC energy consuming devices according to the number of switching groups of the AC energy consuming devices.

[0140] In some embodiments, the operational fault status data includes a DC voltage of the DC power transmission system.

[0141] The switch-in / out instruction generating module 200 is used to determine the number of switch-in groups of the AC energy consuming device according to the change in the active power surplus of the DC power transmission system before and after the fault and the active power of the AC energy consuming device when the DC voltage of the DC power transmission system is monitored to be over-voltage;

[0142] The on / off operation instructions of the AC energy consuming device are generated according to the number of on-board groups of the AC energy consuming device.

[0143] In some embodiments, the operation fault state data includes the AC bus voltage of the converter station of the DC transmission system. The switch-on / off instruction generation module 200 is used to determine the expected total capacity of the AC energy consumption device according to the AC bus voltage of the converter station when it is detected that the AC bus voltage of the converter station is less than a preset AC voltage threshold; determine the number of AC energy consumption device groups according to the expected total capacity and active power of the AC energy consumption device; and generate the switch-on / off operation instruction of the AC energy consumption device according to the number of AC energy consumption device groups.

[0144] In some embodiments, the operating fault status data includes the AC bus voltage and voltage change rate of the converter station of the DC transmission system; the switching instruction generation module 200 is used to determine the expected total capacity of the AC energy consumption device according to the AC bus voltage of the converter station when it is detected that the AC bus voltage of the converter station is greater than a preset AC voltage threshold and the voltage change rate is greater than a preset voltage change threshold; determine the number of AC energy consumption devices in operation according to the expected total capacity and the active power of the AC energy consumption devices; and generate switching operation instructions for the AC energy consumption devices according to the number of AC energy consumption devices in operation.

[0145] In some embodiments, the operating fault state data includes the voltage value of the three-phase six-bridge arm submodule of the converter valve of the sending-end flexible DC converter station of the DC transmission system; the on / off instruction generation module 200 is used to determine the expected total capacity of the AC energy consumption device according to the voltage value of the three-phase six-bridge arm submodule of the converter valve when it is detected that the voltage value of the three-phase six-bridge arm submodule of the converter valve is greater than a preset voltage threshold; determine the number of AC energy consumption device groups according to the expected total capacity and the active power of the AC energy consumption device; generate the on / off operation instructions of the AC energy consumption device according to the number of AC energy consumption device groups and the preset on / off delay.

[0146] like Figure 8 As shown, an embodiment of the present application also provides an electronic device, the electronic device 10 includes a memory 20 and a processor 30, the memory 20 stores a computer program, and when the computer program is executed by the processor 30, the processor 30 executes the steps of the AC energy consumption device control method in any of the above embodiments.

[0147] The embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed, the steps of the method for controlling an AC energy consuming device in any of the above embodiments are implemented.

[0148] An embodiment of the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes the steps of the AC energy consumption device control method in any of the above embodiments.

[0149] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, electronic device and computer storage medium can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0150] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0151] In several embodiments provided by the present invention, it is understood that each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and a part of a module, a program segment or a code includes one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0152] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, electronic devices, computer storage media and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0153] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0154] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0155] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for executing all or part of the steps of the method described in each embodiment of the present invention through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0156] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling an AC energy consuming device, characterized in that: include: Real-time monitoring of the operating fault status data of the DC transmission system to which the DC converter is connected; Based on a preset AC energy consumption device launch and retreat strategy, determining the launch and retreat operation instructions of the AC energy consumption device according to the operation fault state data, wherein the launch and retreat operation instructions include the number of groups of AC energy consumption devices corresponding to the operation fault state data to be launched; The switching operation instruction is sent to the AC energy consuming device for switching on and off control until the fault of the DC power transmission system is successfully crossed and the AC energy consuming device is switched off.

2. The AC energy consumption device control method according to claim 1, characterized in that: The operation fault state data includes a blocking signal of the DC power transmission system; The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, and the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data, including: When it is detected that the DC power transmission system is locked, the number of groups of AC energy consumption devices is determined according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption device; The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

3. The AC energy consumption device control method according to claim 1, characterized in that: The operation fault state data includes a DC line fault signal of the DC power transmission system; The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, and the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data, including: In the case where the DC power transmission system is monitored to have a DC line fault signal, determining the number of groups of AC energy consumption devices to be put into operation according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption device; The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

4. The AC energy consumption device control method according to claim 1, characterized in that: The operation fault state data includes the DC voltage of the DC power transmission system; The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, and the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data, including: In the case where the DC voltage of the DC power transmission system is monitored to be overvoltage, the number of groups of the AC energy consumption devices to be put into operation is determined according to the active power transmitted by the DC power transmission system before the fault, the change in the active power surplus after the fault, and the active power of the AC energy consumption devices; The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

5. The AC energy consumption device control method according to claim 1, characterized in that: The operation fault state data includes the AC bus voltage of the converter station of the DC power transmission system; The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, and the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data, including: When it is detected that the AC bus voltage of the converter station is less than a preset AC voltage threshold, the expected total input capacity of the AC energy consuming device is determined according to the AC bus voltage of the converter station; Determining the number of groups of the AC energy consuming devices to be put into operation according to the expected total capacity of the AC energy consuming devices and the active power of the AC energy consuming devices; The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

6. The AC energy consumption device control method according to claim 1, characterized in that: The operation fault state data includes the AC bus voltage and voltage change rate of the converter station of the DC power transmission system; The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, and the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data, including: When it is detected that the AC bus voltage of the converter station is greater than a preset AC voltage threshold and the voltage change rate is greater than a preset voltage change threshold, the expected total input capacity of the AC energy consumption device is determined according to the AC bus voltage of the converter station; Determining the number of groups of the AC energy consuming devices to be put into operation according to the expected total capacity of the AC energy consuming devices and the active power of the AC energy consuming devices; The switching-on and switching-off operation instructions of the AC energy consuming device are generated according to the number of switching-on groups of the AC energy consuming device.

7. The AC energy consumption device control method according to claim 1, characterized in that: The operation fault state data includes the voltage value of the three-phase six-bridge arm submodule of the converter valve of the sending-end flexible DC converter station of the DC power transmission system; The on / off operation instruction of the AC energy consuming device is determined based on the preset on / off strategy of the AC energy consuming device according to the operation fault state data, and the on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data, including: When it is detected that the voltage value of the three-phase six-bridge arm submodule of the converter valve is greater than a preset voltage threshold, the expected total input capacity of the AC energy consumption device is determined according to the voltage value of the three-phase six-bridge arm submodule of the converter valve; Determining the number of groups of the AC energy consuming devices to be put into operation according to the expected total capacity of the AC energy consuming devices and the active power of the AC energy consuming devices; The switching on and off operation instructions of the AC energy consuming device are generated according to the number of switching on and off groups of the AC energy consuming device and the preset switching on and off delays.

8. The AC energy consumption device control method according to claim 1, characterized in that: Also includes: When the operation fault status data is of multiple data types, the maximum number of activation groups of the AC energy consuming device is screened out based on the preset activation and deactivation strategy of the AC energy consuming device, and activation and deactivation operation instructions of the AC energy consuming device are determined.

9. An AC energy consumption device control system, characterized in that: include: A data monitoring module, used for real-time monitoring of the operating fault status data of the DC power transmission system to which the DC converter is connected; A switch-on / off instruction generating module, used to determine the switch-on / off operation instruction of the AC energy consuming device according to the operation fault state data based on the preset switch-on / off strategy of the AC energy consuming device, wherein the switch-on / off operation instruction includes the number of groups of AC energy consuming devices corresponding to the operation fault state data to be switched on; The switching control module is used to send the switching operation instruction to the AC energy consuming device for switching control until the fault of the DC power transmission system is successfully crossed and the AC energy consuming device is switched off.

10. An electronic device, characterized in that: The electronic device includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method for controlling an AC energy consuming device according to any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the steps of the method for controlling an AC energy consuming device according to any one of claims 1 to 8 are implemented.

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