Method and device for coordinated reactive power support of multiple equipment to suppress transient overvoltage

Abstract

The application provides a kind of inhibiting transient overvoltage multi-equipment coordinated reactive power support method, device, electronic equipment and storage medium.Belongs to new energy power generation technical field.Method includes: according to the voltage information of current electric power equipment grid-connected point, determine whether electric power equipment exists transient overvoltage fault, according to the equipment type of electric power equipment, determine corresponding reactive power response time scale grade, in the case where electric power equipment exists transient overvoltage fault, according to the equipment type of electric power equipment and transient overvoltage fault type, determine corresponding reactive power compensation strategy.Through combining the time scale of reactive power response of different equipment and the reactive power compensation capacity of different equipment under different transient overvoltage faults, the support strategy of different electric power equipment under different overvoltage faults is determined, the reactive power support potential of each equipment itself is fully tapped, so as to realize the unified coordination optimization of multi-equipment reactive power support, provide technical support for improving the ability of system to inhibit transient overvoltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy power generation technology, and particularly relates to a multi-equipment coordinated reactive power support method for suppressing transient overvoltage, an electronic device and a storage medium. BACKGROUND

[0002] Wind power, photovoltaic and other renewable energy power generation technologies are increasingly mature, and play an increasingly important role in China's energy security, environmental improvement and economic sustainable development. China's new energy mostly adopts a development mode of "centralized arrangement and long-distance transmission", and high-voltage direct current transmission has become an effective power transmission method for realizing large-scale and wide-range energy configuration in China due to its unique advantages of long transmission distance, large transmission capacity and suitability for large regional power grid networking. Commutation failure and direct current blocking are the most common faults of direct current transmission systems. Commutation failure can cause a decrease in direct current voltage and an increase in direct current current. When the fault is serious or control is improper, direct current blocking may occur to interrupt the transmission of direct current power, which eventually endangers the stable operation of the entire power grid. Therefore, the problem of transient overvoltage of a weak sending end alternating current system caused by a direct current system fault is an urgent problem to be solved.

[0003] In the related art, only a few power equipment have the ability of reactive power compensation, and there is a lack of unified coordination and optimization of different power equipment to suppress transient overvoltage after a direct current system fault. SUMMARY

[0004] The embodiments of the present application provide a multi-equipment coordinated reactive power support method for suppressing transient overvoltage, an electronic device and a storage medium, and aim at the problems existing in the above special cases.

[0005] In order to solve the above technical problems, the present application is implemented as follows:

[0006] In a first aspect, the embodiments of the present application provide a multi-equipment coordinated reactive power support method for suppressing transient overvoltage, and the method comprises the following steps:

[0007] Real-time monitoring of voltage information of each power equipment grid connection point;

[0008] According to the voltage information of the current power equipment grid connection point, it is judged whether the power equipment has a transient overvoltage fault;

[0009] Obtaining the reactive power response time scale level corresponding to the equipment type of the power equipment;

[0010] In the case that the power equipment has a transient overvoltage fault, according to the reactive power response time scale level corresponding to the power equipment, the reactive power compensation strategy corresponding to the power equipment is extracted, and the reactive power compensation strategies corresponding to different reactive power response time scale levels are different;

[0011] performing reactive power compensation on the power equipment according to the corresponding reactive power compensation strategy of the power equipment.

[0012] Optionally, the step of obtaining the reactive response time scale level corresponding to the equipment type of the power equipment comprises:

[0013] In a case where the equipment type of the power equipment is a first equipment type, the reactive response time scale level corresponding to the equipment type of the power equipment is a first time scale level;

[0014] In a case where the equipment type of the power equipment is a second equipment type, the reactive response time scale level corresponding to the equipment type of the power equipment is a second time scale level;

[0015] In a case where the equipment type of the power equipment is a third equipment type, the reactive response time scale level corresponding to the equipment type of the power equipment is a third time scale level;

[0016] wherein a minimum value of the reactive response time threshold interval corresponding to the second time scale level is greater than a maximum value of the reactive response time threshold interval of the first time scale level, and a minimum value of the reactive response time threshold interval corresponding to the third time scale level is greater than a maximum value of the reactive response time threshold interval of the second time scale level.

[0017] Optionally, the step of extracting the corresponding reactive power compensation strategy of the power equipment according to the reactive response time scale level corresponding to the power equipment comprises:

[0018] In a case where the reactive response time scale level corresponding to the power equipment is a first time scale level, the corresponding reactive power compensation strategy of the power equipment is to put into reactive power control;

[0019] In a case where the reactive response time scale level corresponding to the power equipment is a second time scale level, the corresponding reactive power compensation strategy of the power equipment is further extracted according to a sub-class in the second equipment type, and different sub-classes of power equipment correspond to different reactive power compensation strategies;

[0020] In a case where the reactive response time scale level corresponding to the power equipment is a third time scale level, the corresponding reactive power compensation strategy of the power equipment is to directly remove the power equipment.

[0021] Optionally, according to the fault type of the transient overvoltage fault, in a case where the equipment type of the power equipment belongs to a first sub-class in the second equipment type, the corresponding reactive power compensation strategy of the power equipment comprises:

[0022] if the fault type of the transient overvoltage fault is a DC commutation failure fault, the power equipment does not act;

[0023] if the fault type of the transient overvoltage fault is a DC blocking shallow overvoltage fault, the power equipment is put into reactive power control;

[0024] if the fault type of the transient overvoltage fault is a DC blocking deep overvoltage fault, the power equipment does not act.

[0025] Optionally, according to the fault type of the transient overvoltage fault, in a case where the equipment type of the power equipment belongs to a second sub-class in the second equipment type, the corresponding reactive power compensation strategy of the power equipment comprises:

[0026] if the fault type of the transient overvoltage fault is a DC commutation failure fault, the power equipment does not act;

[0027] if the fault type of the transient overvoltage fault is a DC blocking shallow overvoltage fault, the power equipment is put into reactive power control;

[0028] if the fault type of the transient overvoltage fault is a DC blocking deep overvoltage fault, the power equipment is switched to an asynchronous motor operation mode.

[0029] The second aspect of the embodiment of the present application proposes a multi-equipment coordinated reactive power device for suppressing transient overvoltage, and the device comprises:

[0030] a monitoring unit configured to monitor voltage information of a grid connection point of each power equipment in real time;

[0031] a judging unit configured to judge whether the power equipment has a transient overvoltage fault according to the voltage information of the grid connection point of the current power equipment;

[0032] an obtaining unit configured to obtain a reactive power response time scale level corresponding to the equipment type of the power equipment;

[0033] an extracting unit configured to, in a case where the power equipment has a transient overvoltage fault, extract a corresponding reactive power compensation strategy of the power equipment according to the reactive power response time scale level corresponding to the power equipment, the corresponding reactive power compensation strategy being different under different reactive power response time scale levels;

[0034] an executing unit configured to perform reactive power compensation by using the corresponding reactive power compensation strategy of the power equipment.

[0035] Optionally, a first determining subunit is configured to, in a case where the equipment type of the power equipment is a first equipment type, obtain the reactive power response time scale level corresponding to the equipment type of the power equipment as a first time scale level;

[0036] the second determining sub-unit is configured to obtain, in a case where the equipment type of the power equipment is a second equipment type, a reactive power response time scale level corresponding to the equipment type of the power equipment as a second time scale level;

[0037] the third determining sub-unit is configured to obtain, in a case where the equipment type of the power equipment is a third equipment type, a reactive power response time scale level corresponding to the equipment type of the power equipment as a third time scale level;

[0038] wherein a minimum value of a reactive power response time threshold interval corresponding to the second time scale level is greater than a maximum value of the reactive power response time threshold interval of the first time scale level, and a minimum value of a reactive power response time threshold interval corresponding to the third time scale level is greater than a maximum value of the reactive power response time threshold interval of the second time scale level.

[0039] Optionally, the extraction unit comprises:

[0040] the first extraction sub-unit is configured to extract, in a case where the reactive power response time scale level corresponding to the power equipment is a first time scale level, a reactive power compensation strategy corresponding to the power equipment as being put into reactive power control;

[0041] the second extraction sub-unit is configured to extract, in a case where the reactive power response time scale level corresponding to the power equipment is a second time scale level, a reactive power compensation strategy corresponding to the power equipment according to a sub-class in the second equipment type;

[0042] the third extraction sub-unit is configured to extract, in a case where the reactive power response time scale level corresponding to the power equipment is a third time scale level, a reactive power compensation strategy corresponding to the power equipment as being directly removed by the power equipment.

[0043] The third aspect of the embodiment of the present application provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method steps of the first aspect of the embodiment of the present application are implemented.

[0044] The fourth aspect of the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and when the processor executes the computer program, the method steps of the first aspect of the embodiment of the present application are implemented.

[0045] The embodiment of the present application comprises the following advantages: the application determines whether the power equipment has transient overvoltage fault according to the voltage information of the current power equipment grid connection point; determines the reactive power response time scale level corresponding to the power equipment according to the equipment type of the power equipment; determines the reactive power compensation strategy corresponding to the power equipment according to the equipment type of the power equipment in the case that the power equipment has transient overvoltage fault. By combining the time scale of the reactive power response of different equipment and the reactive power compensation capacity of different equipment under different transient overvoltage faults, the support strategy of different power equipment under different transient overvoltage faults is determined, and the potential of the reactive power support of each equipment is fully tapped. Therefore, the unified coordination optimization of the reactive power support of multiple equipment is realized. Technical support is provided for further improving the ability of the system to suppress transient overvoltage. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0047] Figure 1 is a step flow chart of a multi-equipment coordinated reactive power support method for suppressing transient overvoltage in the embodiment of the present application;

[0048] Figure 2 is a time scale diagram of the reactive power response of different power equipment in the embodiment of the present application;

[0049] Figure 3 is a diagram of the reactive power compensation capacity of power equipment under different transient overvoltage faults in the embodiment of the present application;

[0050] Figure 4 is a simulation result diagram in the embodiment of the present application;

[0051] Figure 5 is a functional subunit diagram of a multi-equipment coordinated reactive power support device for suppressing transient overvoltage in the embodiment of the present application;

[0052] Figure 6 is a functional subunit diagram of an electronic device in the embodiment of the present application. DETAILED DESCRIPTION

[0053] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0054] In the related art, for the reactive power / voltage problem, the reactive power compensation device is a relatively ideal solution, and usually, phase modifier, static var compensator (SVC) and static synchronous compensator (STATCOM) are considered. Different reactive power compensation devices have different principles and dynamic response characteristics, and the technical requirements of various types of power grids and application scenarios in China for reactive power compensation devices are not the same. In addition to the reactive power compensation device, the active support for the DC sending end power grid voltage can also be realized by fully developing the reactive power regulation capability of new energy itself and HVDC.

[0055] The inventors found that the research on the reactive power compensation capability of various devices by scholars at home and abroad at present is mostly focused on the technical principles, control strategies, installation points and the like, and the corresponding unified coordination optimization of multi-device reactive power compensation has not been combined with the time scale of reactive power response of different equipment and the reactive power compensation capability under different transient overvoltage faults. Based on this, the technical solutions of the present application are proposed.

[0056] The embodiment of the present application provides a multi-device coordinated reactive power support method for suppressing transient overvoltage, referring to Figure 1 , Figure 1 The embodiment of the present application shows a step flow chart of a multi-device coordinated reactive power support method for suppressing transient overvoltage, and the method comprises the following steps:

[0057] Step S101: Real-time monitoring of voltage information of each power equipment grid connection point.

[0058] The ultra-high voltage DC power transmission has large transmission capacity, and 50%-60% of the transmitted power is consumed as reactive power. When the DC system is suddenly blocked or runs at a reduced power, the excess reactive power of the converter station is sent back to the AC system, and when the DC blocking fault occurs, the transient overvoltage phenomenon with a duration of generally not more than 200-600 ms and an amplitude exceeding 20% will occur. When the DC commutation failure fault occurs, the AC voltage will produce a transient voltage drop and a transient voltage rise with a high frequency, and the duration of the transient voltage drop and the transient voltage rise is about 0.02-0.04 s and 0.03-0.06 s respectively. Therefore, each device in the power grid system will real-time detect the information of its grid connection point.

[0059] Step S102: judging whether the power equipment has transient overvoltage fault according to the voltage information of the power equipment grid-connection point.

[0060] Each power equipment detects whether overvoltage phenomenon will occur according to the voltage information of the grid-connection point. In the embodiment, the overvoltage phenomenon is the transient overvoltage after DC system fault.

[0061] Step S103: obtaining the reactive power response time scale level corresponding to the equipment type of the power equipment.

[0062] The reactive power response time refers to the dynamic response time of the reactive power compensation controller, which is the time interval from when the reactive power in the system reaches the switching threshold to when the controller sends the switching control signal. The shorter the reactive power response time of the power equipment, the faster the response speed of the compensation when the transient overvoltage occurs. Different power equipment has different reactive power response times due to the functional differences of the equipment. The reactive power response time is segmented and divided according to the time axis, and different reactive power response time periods correspond to different time scales of the reactive power compensation device of different levels. Therefore, according to the equipment type of the power equipment, the corresponding level of the reactive power response time scale can be determined.

[0063] Step S104: in the case that the power equipment has transient overvoltage fault, according to the equipment type of the power equipment and the reactive power response time scale level corresponding to the power equipment, the reactive power compensation strategy corresponding to the power equipment is obtained, and the reactive power compensation strategies corresponding to different reactive power response time scale levels are different.

[0064] After the reactive power response time scale of each power equipment is obtained, the power equipment can be classified and divided according to the equipment type according to the reactive power response time scale. After the classification and division, in the case that the power equipment of different equipment types has transient overvoltage fault, different reactive power compensation strategies are executed according to the equipment type of the power equipment and the reactive power response time scale level corresponding to the power equipment.

[0065] In the embodiment, the unified coordination optimization of the reactive power support of multiple power equipment is performed in combination with the time scale of the reactive power response of different power equipment and the reactive power compensation capability of different equipment under different transient overvoltage faults. Each power equipment can automatically switch the control mode according to the difference of the transient overvoltage fault type, so as to realize the reactive power support under the wide-range transient overvoltage fault of the power grid under the coordination control of the proposed strategy, and better inhibit the transient overvoltage after the DC system fault, thereby providing technical support for further improving the ability of the system to inhibit the transient overvoltage.

[0066] In a feasible embodiment, the step of obtaining the reactive power response time scale level corresponding to the equipment type of the power equipment according to the equipment type of the power equipment comprises:

[0067] In a case where the equipment type of the power equipment is the first equipment type, a reactive power response time scale level corresponding to the equipment type of the power equipment is obtained as the first time scale level;

[0068] In a case where the equipment type of the power equipment is the second equipment type, a reactive power response time scale level corresponding to the equipment type of the power equipment is obtained as the second time scale level;

[0069] In a case where the equipment type of the power equipment is the third equipment type, a reactive power response time scale level corresponding to the equipment type of the power equipment is obtained as the third time scale level;

[0070] The minimum value of the reactive power response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive power response time threshold interval of the first time scale level, and the minimum value of the reactive power response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive power response time threshold interval of the second time scale level.

[0071] In the embodiment, as shown in a time scale diagram of different power equipment reactive power responses. Figure 2 The first equipment type of power equipment includes a synchronous condenser, and the sub-transient characteristics of the condenser can send reactive power of 1.5 times or more of the rated capacity within 10 ms, so the reactive power response time thereof corresponds to the T1 level time scale in Figure 2 , and the corresponding reactive power response time scale level is the first time scale level. The third equipment type of power equipment includes an HVDC sending end AC filter, and the HVDC sending end AC filter cut-off includes logic calculation, signal transmission and switch opening time, and the cut-off time thereof is about 200 ms, so the reactive power response time thereof corresponds to the T3 level time scale in Figure 2The middle T4 time scale corresponds to the third time scale level of the reactive power response time scale. The second equipment type of power equipment includes static var compensator (SVC), static var generator (SVG), permanent magnet synchronous generator (PMSG), doubly fed induction generator (DFIG), and voltage source converter based high voltage direct current transmission (VSC-HVDC). Among them, the SVG, PMSG, DFIG, and VSC-HVDC reactive power control essentially belong to the control of the converter to the reactive current. In actual closed-loop control, the SVC and the SVG both artificially set a certain delay in the outer loop controller to avoid controller spontaneous oscillation and other problems under certain working conditions, so the closed-loop reactive power response will be slightly slower. The overall reactive power response time of the large-capacity SVG is about 50 ms, and the overall reactive power response time of the SVC is about 100 ms. From the level of the overall time scale, the operation of the two under the DC commutation failure fault is the same, so they are divided into the second equipment type of power equipment, and the corresponding reactive power response time scale level is the second time scale level. That is Figure 2 The T2 time scale and the T3 time scale correspond to the time scale.

[0072] In a feasible implementation, according to the reactive power response time scale level corresponding to the power equipment, the step of extracting the reactive power compensation strategy corresponding to the power equipment includes:

[0073] When the reactive power response time scale level corresponding to the power equipment is the first time scale level, the reactive power compensation strategy corresponding to the power equipment is put into reactive power control.

[0074] When the reactive power response time scale level corresponding to the power equipment is the second time scale level, further according to the sub-class in the second equipment type, the reactive power compensation strategy corresponding to the power equipment is extracted, and different sub-classes of power equipment correspond to different reactive power compensation strategies.

[0075] When the reactive power response time scale level corresponding to the power equipment is the third time scale level, the reactive power compensation strategy corresponding to the power equipment is directly cut off.

[0076] In the present embodiment, the first equipment type of power equipment phase modifier is configured to act under any transient overvoltage fault, when the phase modifier detects the transient overvoltage fault at the point of common coupling, the phase modifier will automatically provide reactive power support regardless of the fault type of the transient overvoltage fault. The third equipment type of power equipment HVDC sending end AC filter is also configured to act under any transient overvoltage fault, when the HVDC sending end AC filter detects the transient overvoltage fault at the point of common coupling, the HVDC sending end AC filter will be tripped from the power grid system regardless of the fault type of the transient overvoltage fault, thereby suppressing the transient overvoltage fault. The second equipment type of power equipment SVG, SVC, PMSG, VSC-HVDC and DFIG, when detecting the transient overvoltage fault at the point of common coupling, due to its containing different sub-class equipment types, containing the first sub-class and the second sub-class. The specific compensation strategy of different sub-class equipment types is not the same. Therefore, it is also necessary to judge the specific type of the transient overvoltage fault, and then execute the corresponding reactive power compensation strategy according to the specific type of the transient overvoltage fault.

[0077] In a feasible embodiment, according to the fault type of the transient overvoltage fault, in the case that the equipment type of the power equipment belongs to the first sub-class in the second equipment type, the corresponding reactive power compensation strategy of the power equipment includes:

[0078] If the fault type of the transient overvoltage fault is DC commutation failure fault, the power equipment does not act;

[0079] If the fault type of the transient overvoltage fault is DC blocking shallow overvoltage fault, the power equipment is put into reactive power control;

[0080] If the fault type of the transient overvoltage fault is DC blocking deep overvoltage fault, the power equipment does not act.

[0081] In the embodiment, the power equipment of the second equipment type, SVG, SVC, PMSG, VSC-HVDC, as the first sub-type of the second equipment type, if it is judged that the type of the fault is DC commutation failure fault when the transient overvoltage fault at the grid connection point is detected. As an example, due to the DC commutation failure fault, the voltage time is very fast, if the transient overvoltage occurs at t=10 ms, and the voltage drops at t=50 ms, since the reactive power response time scale level of the power equipment of the second equipment type, SVG, SVC, PMSG, VSC-HVDC and DFIG is the second time scale level, that is, the time of reactive power response is 50 ms or 100 ms, therefore, the reactive power suppression of the transient overvoltage fault at t=10 ms is performed at t=50 ms, and at this time, the voltage itself is in a drop state, and cannot timely track and compensate the voltage after the DC commutation failure transient overvoltage fault, therefore, the phenomenon of reactive power counter-adjustment deteriorating the transient overvoltage fault occurs, in order to prevent the reactive power counter-adjustment from deteriorating the transient overvoltage fault, the power equipment of the third equipment type does not act at this time, and the reactive power support capability of each equipment is terminated. If it is judged that the type of the fault is DC blocking fault, the degree of the transient overvoltage fault is continuously judged, since the overvoltage capability of the power electronic device has a certain limit, therefore, according to the different overvoltage amplitudes, the transient overvoltage after the DC blocking fault is divided into two types, deep overvoltage and shallow overvoltage, if the amplitude of the overvoltage is higher than λ, it can be called DC blocking deep transient overvoltage fault, at this time, the overvoltage capability of the power electronic device is exceeded, in order to protect the power electronic equipment, each equipment is stopped from acting; if it is lower than λ, it can be called DC blocking shallow transient overvoltage fault, at this time, each equipment respectively performs reactive power support to suppress the transient overvoltage fault, as an example, usually 1.3 pu is taken. And in the actual scene, the value can be selected according to the actual overvoltage capability of the device itself, which is not limited in the application.

[0082] In a feasible embodiment, according to the fault type of the transient overvoltage fault, in the case that the equipment type of the power equipment belongs to the second sub-class in the second equipment type, the corresponding reactive power compensation strategy of the power equipment comprises:

[0083] If the fault type of the transient overvoltage fault is DC commutation failure fault, the power equipment does not act;

[0084] If the fault type of the transient overvoltage fault is DC blocking shallow overvoltage fault, the power equipment is put into reactive power control;

[0085] If the fault type of the transient overvoltage fault is DC blocking deep overvoltage fault, the power equipment is switched to an asynchronous motor operation mode.

[0086] In the embodiment, the power equipment DFIG of the second equipment type as the second sub-type of the second equipment type judges the type of the fault as the DC commutation failure fault when detecting that the grid-connected point appears the transient overvoltage fault. As an example, the voltage of the DFIG is very fast due to the DC commutation failure fault, in order to prevent the deterioration of the transient overvoltage fault by the reactive power reverse regulation, the DFIG does not act at this time, and the reactive power support capability of the DFIG is terminated. If the type of the fault is judged as the DC blocking fault, the degree of the transient overvoltage fault is continuously judged. When the DFIG appears the deep transient overvoltage fault of the DC blocking, the control DFIG is disconnected from the converter, so that the working DFIG is in the DFIG+Crowbar asynchronous motor mode, and the reactive power regulation can be automatically performed to suppress the transient overvoltage fault. When the DFIG appears the shallow transient overvoltage fault of the DC blocking, the converter of the DFIG is enabled to support the reactive power to suppress the transient overvoltage fault. If the shallow transient overvoltage fault of the DC blocking appears, the respective equipment is enabled to support the reactive power to suppress the transient overvoltage fault at this time, and as an example, the value is usually 1.3pu. In the actual scene, the value can be selected according to the actual overvoltage capability of the equipment, and the application is not limited in this regard.

[0087] The embodiment of the application further provides a multi-equipment coordinated reactive power support system for suppressing transient overvoltage. Figure 5 The embodiment of the application further provides a multi-equipment coordinated reactive power support device for suppressing transient overvoltage of grid connection, and a function unit diagram of the device is shown in the figure, and the system can include the following units:

[0088] The monitoring unit 501 is used for monitoring the voltage information of the grid-connected point of each power equipment in real time.

[0089] The judging unit 502 is used for judging whether the power equipment exists the transient overvoltage fault according to the voltage information of the grid-connected point of the current power equipment.

[0090] The obtaining unit 503 is used for obtaining the reactive power response time scale level corresponding to the equipment type of the power equipment.

[0091] The extracting unit 504 is used for extracting the reactive power compensation strategy corresponding to the power equipment according to the reactive power response time scale level corresponding to the power equipment in the case that the power equipment exists the transient overvoltage fault, and the reactive power compensation strategy corresponding to different reactive power response time scale levels is different.

[0092] The executing unit 505 is used for performing the reactive power compensation by using the reactive power compensation strategy corresponding to the power equipment.

[0093] In a feasible embodiment, the determining unit 503 includes:

[0094] The first determining subunit is used to obtain the reactive response time scale level corresponding to the equipment type of the power equipment as the first time scale level when the equipment type of the power equipment is the first equipment type.

[0095] The second determining subunit is used to obtain the reactive response time scale level corresponding to the equipment type of the power equipment as the second time scale level when the equipment type of the power equipment is the second equipment type.

[0096] The third determining subunit is used to obtain the reactive response time scale level corresponding to the equipment type of the power equipment as the third time scale level when the equipment type of the power equipment is the third equipment type.

[0097] Wherein, the minimum value of the reactive power response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive power response time threshold interval corresponding to the first time scale level, and the minimum value of the reactive power response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive power response time threshold interval corresponding to the second time scale level.

[0098] In one feasible implementation, the extraction unit 504 includes:

[0099] The first extraction subunit is used to extract the reactive power compensation strategy corresponding to the power equipment as reactive power control when the reactive power response time scale level corresponding to the power equipment is the first time scale level.

[0100] The second extraction subunit is used to further extract the reactive power compensation strategy corresponding to the power equipment according to the subclass in the second equipment type when the reactive power response time scale level corresponding to the power equipment is the second time scale level.

[0101] The third extraction subunit is used to extract the reactive power compensation strategy corresponding to the power equipment as direct disconnection of the power equipment when the reactive power response time scale level corresponding to the power equipment is the third time scale level.

[0102] This invention also provides an electronic device, such as... Figure 6 As shown, it includes a processor 61, a communication interface 62, a memory 63, and a communication bus 64, wherein the processor 61, the communication interface 62, and the memory 63 communicate with each other through the communication bus 64.

[0103] Memory 63 is used to store computer programs;

[0104] When the processor 61 executes the program stored in the memory 63, it implements the steps of the first aspect of the present invention.

[0105] The communication bus mentioned above can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0106] The communication interface is used for communication between the terminal and other devices.

[0107] The memory can include a Random Access Memory (RAM) and can also include a non-volatile memory, such as at least one disk memory. Optionally, the memory can also be at least one storage device located away from the processor.

[0108] The processor mentioned above can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; can also be a Digital Signal Processing (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0109] In another embodiment provided by the application, a computer readable storage medium is also provided, and the computer readable storage medium stores instructions, when the instructions are run on a computer, the computer is caused to execute the method for multi-equipment coordinated reactive power support for suppressing transient overvoltage in grid connection provided in any of the above embodiments.

[0110] Each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0111] Those skilled in the art will appreciate that embodiments of the present application can be readily used as a method, apparatus, or computer program product. Accordingly, embodiments of the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, and the like) embodying computer program instructions.

[0112] Embodiments of the present application are described herein with reference to flowchart illustrations and / or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing device or other programmable data processing terminal devices to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal devices, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0113] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing terminal device to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0114] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device to cause a series of operational steps to be performed on the computer or other programmable terminal device to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal device provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams.

[0115] Finally, it is to be understood that the phraseology or terminology such as "first" and "second" etc. used herein is merely intended to differentiate one entity or operation from another entity or operation, without necessarily requiring or implying any actual such relationship or order between such entities or operations. "And / or" means that either one of the two or both can be selected. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0116] The above describes in detail the method, system, device and storage medium provided by the application for suppressing transient overvoltage, and the principle and implementation of the application are described by using specific examples. The above description of the examples is only used to help understand the method of the application and its core idea. Meanwhile, for those skilled in the art, the specific implementation and application range can be changed according to the idea of the application. In summary, the content of the specification should not be understood as a limitation of the application.

Claims

1. A method for coordinating reactive power support of multiple equipment to suppress transient overvoltages, characterized in that, The method includes the following steps: Real-time monitoring of voltage information at grid connection points of various power equipment; Based on the voltage information of the current power equipment grid connection point, determine whether the power equipment has a transient overvoltage fault; Obtain the reactive power response time scale level corresponding to the equipment type of the power equipment; In the event of a transient overvoltage fault in the power equipment, a reactive power compensation strategy corresponding to the power equipment is extracted based on the reactive power response time scale level of the power equipment. The reactive power compensation strategies are different under different reactive power response time scale levels. Reactive power compensation is performed using the reactive power compensation strategy corresponding to the power equipment.

2. The method according to claim 1, characterized in that, The steps for obtaining the reactive power response time scale level corresponding to the equipment type of the power equipment include: When the equipment type of the power equipment is a first equipment type, the reactive power response time scale level corresponding to the equipment type of the power equipment is obtained as the first time scale level. When the equipment type of the power equipment is the second equipment type, the reactive power response time scale level corresponding to the equipment type of the power equipment is obtained as the second time scale level. When the equipment type of the power equipment is the third equipment type, the reactive power response time scale level corresponding to the equipment type of the power equipment is obtained as the third time scale level. Wherein, the minimum value of the reactive power response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive power response time threshold interval corresponding to the first time scale level, and the minimum value of the reactive power response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive power response time threshold interval corresponding to the second time scale level.

3. The method according to claim 2, characterized in that, The steps for extracting the reactive power compensation strategy corresponding to the power equipment based on the reactive power response time scale level of the power equipment include: When the reactive response time scale level corresponding to the power equipment is the first time scale level, the reactive compensation strategy corresponding to the power equipment is extracted as reactive control. When the reactive response time scale level corresponding to the power equipment is the second time scale level, the reactive compensation strategy corresponding to the power equipment is further extracted according to the sub-class in the second equipment type. Different sub-classes of power equipment correspond to different reactive compensation strategies. When the reactive power response time scale level corresponding to the power equipment is the third time scale level, the reactive power compensation strategy corresponding to the power equipment is extracted as direct disconnection of the power equipment.

4. The method according to claim 3, characterized in that, Based on the fault type of the transient overvoltage fault, and when the equipment type of the power equipment belongs to the first subclass of the second equipment type, the reactive power compensation strategy corresponding to the power equipment includes: If the fault type of the transient overvoltage fault is a DC commutation failure fault, then the power equipment will not operate; If the fault type of the transient overvoltage fault is a DC blocking shallow overvoltage fault, then the power equipment shall be put into reactive power control. If the transient overvoltage fault is a DC blocking depth overvoltage fault, the power equipment will not operate.

5. The method according to claim 3, characterized in that, Based on the fault type of the transient overvoltage fault, and when the equipment type of the power equipment belongs to the second sub-category of the second equipment type, the reactive power compensation strategy corresponding to the power equipment includes: If the fault type of the transient overvoltage fault is a DC commutation failure fault, then the power equipment will not operate; If the fault type of the transient overvoltage fault is a DC blocking shallow overvoltage fault, then the power equipment shall be put into reactive power control. If the transient overvoltage fault is classified as a DC blocking deep overvoltage fault, the power equipment will switch to asynchronous motor operation mode.

6. A multi-equipment coordinated reactive power support device for suppressing transient overvoltages, characterized in that, The device includes: The monitoring unit is used to monitor the voltage information of each power equipment grid connection point in real time; The judgment unit is used to determine whether the power equipment has a transient overvoltage fault based on the voltage information of the current power equipment grid connection point; The acquisition unit is used to obtain the reactive power response time scale level corresponding to the equipment type of the power equipment; The extraction unit is used to extract the reactive power compensation strategy corresponding to the power equipment according to the reactive power response time scale level corresponding to the power equipment when the power equipment has a transient overvoltage fault. The reactive power compensation strategy is different under different reactive power response time scale levels. An execution unit is used to perform reactive power compensation using the reactive power compensation strategy corresponding to the power equipment.

7. The apparatus according to claim 6, characterized in that, The acquisition unit includes: The first determining subunit is used to obtain the reactive response time scale level corresponding to the equipment type of the power equipment as the first time scale level when the equipment type of the power equipment is the first equipment type. The second determining subunit is used to obtain the reactive response time scale level corresponding to the equipment type of the power equipment as the second time scale level when the equipment type of the power equipment is the second equipment type. The third determining subunit is used to obtain the reactive response time scale level corresponding to the equipment type of the power equipment as the third time scale level when the equipment type of the power equipment is the third equipment type. Wherein, the minimum value of the reactive power response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive power response time threshold interval corresponding to the first time scale level, and the minimum value of the reactive power response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive power response time threshold interval corresponding to the second time scale level.

8. The apparatus according to claim 7, characterized in that, The extraction unit includes: The first extraction subunit is used to extract the reactive power compensation strategy corresponding to the power equipment as reactive power control when the reactive power response time scale level corresponding to the power equipment is the first time scale level. The second extraction subunit is used to further extract the reactive power compensation strategy corresponding to the power equipment according to the subclass in the second equipment type when the reactive power response time scale level corresponding to the power equipment is the second time scale level. The third extraction subunit is used to extract the reactive power compensation strategy corresponding to the power equipment as direct disconnection of the power equipment when the reactive power response time scale level corresponding to the power equipment is the third time scale level.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5.

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