CN115549141A - Static voltage active supporting device and method for power grid transient voltage support - Google Patents

Static voltage active supporting device and method for power grid transient voltage support Download PDF

Info

Publication number
CN115549141A
CN115549141A CN202211344104.5A CN202211344104A CN115549141A CN 115549141 A CN115549141 A CN 115549141A CN 202211344104 A CN202211344104 A CN 202211344104A CN 115549141 A CN115549141 A CN 115549141A
Authority
CN
China
Prior art keywords
voltage
module
main circuit
energy storage
power grid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211344104.5A
Other languages
Chinese (zh)
Inventor
杨志昌
赵国亮
黄勇
张进
戴朝波
于弘洋
刘啸歌
陆振纲
胡锴
王颖
王涛
张章
张倩茅
齐晓光
田家辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Smart Grid Research Institute Co ltd
State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Hebei Electric Power Co Ltd
Original Assignee
State Grid Smart Grid Research Institute Co ltd
State Grid Corp of China SGCC
Economic and Technological Research Institute of State Grid Hebei Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Smart Grid Research Institute Co ltd, State Grid Corp of China SGCC, Economic and Technological Research Institute of State Grid Hebei Electric Power Co Ltd filed Critical State Grid Smart Grid Research Institute Co ltd
Priority to CN202211344104.5A priority Critical patent/CN115549141A/en
Publication of CN115549141A publication Critical patent/CN115549141A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The application discloses a static voltage active supporting device and method for power grid transient voltage support. The method comprises the following steps: the converter main circuit module is connected with the equivalent power grid module through an alternating current bus, and is connected with the concentrated energy storage module through a coupling circuit, so that the converter main circuit module and the concentrated energy storage module can exchange energy. The converter main circuit module acquires direct current energy by using the centralized energy storage module, modulates the acquired direct current voltage, constructs a target voltage source with adjustable voltage amplitude and phase, and naturally forms current based on the voltage difference between the target voltage source and the alternating current bus voltage to realize power exchange between the device and a power grid. The concentrated energy storage module connected with the converter main circuit module is arranged, so that target voltage can be constructed autonomously, quick response can be realized during fault, and active transient voltage support is provided for a system.

Description

Static voltage active supporting device and method for power grid transient voltage support
Technical Field
The application relates to the field of electric power, in particular to a static voltage active supporting device and method for power grid transient voltage support.
Background
The novel energy unit is accessed in a large scale, the ultra-high voltage direct current transmission project is put into operation in succession, and the conventional thermal power generating unit is gradually withdrawn, the operation characteristics of the power grid are deeply changed, the transient voltage problem of the power grid is prominent, and the novel energy unit has the following four novel characteristics:
(1) The transient voltage of the receiving end of the extra-high voltage direct current restricts the whole sending capability of the system. The large-scale new energy is accessed to replace a conventional synchronous generator set, the main network voltage supporting capability is insufficient, and the transient overvoltage level of the converter station is high during fault, so that the system is forced to operate in a derating manner.
(2) The transient voltage stability problem of the system is prominent due to the 'hollowing' of the receiving-end power grid. The receiving-end power grid is fed in through direct current in a large scale, the starting capacity of a local conventional thermal power generating unit is continuously reduced, the hollowing trend of the receiving-end power grid is obvious, the transient voltage supporting capability of the receiving-end power grid is reduced, and the problem of transient voltage stability is prominent.
(3) The problems of over-standard short-circuit current and insufficient transient voltage support coexist. A large amount of power supplies of a transmitting-end power grid are transmitted out through direct current, and a power plant/a transformer substation of a receiving-end power grid is dense, so that the problems of over-standard short-circuit current and insufficient transient voltage support of the transmitting-receiving-end power grid exist.
(4) The fault influence range has obvious tendency of spreading from local to global. Due to the fact that transient voltage supporting capacity of a power grid is insufficient, in a region with multiple direct current feeds, a single alternating current fault may cause simultaneous commutation failure of multiple direct currents, transient voltage of a near region of a sending end fluctuates greatly and rapidly, the risk of large-scale disordered disconnection of a new energy unit exists, and the influence of the fault on operation of the power grid is diffused to the whole situation from the local part.
In conclusion, it is urgently needed to improve the transient voltage supporting capability of the power grid and ensure the safe and stable operation of the power grid.
Disclosure of Invention
In order to solve the above technical problem or at least partially solve the above technical problem, the present application provides a static voltage active support device and method for power grid transient voltage support.
According to an aspect of the embodiments of the present application, there is provided a static voltage active supporting device facing a grid transient voltage support, including: transverter main circuit module and concentrated energy storage module, transverter main circuit module connects through alternating current bus and equivalence electric wire netting module and is connected, transverter main circuit module pass through coupling circuit with concentrated energy storage module connects, so that transverter main circuit module with concentrated energy storage module carries out the exchange of energy, transverter main circuit module includes: the main circuits are connected in a star connection cascade mode, each main circuit comprises a plurality of sub-modules connected in series, and different main circuits are connected with different voltage output ends;
the converter main circuit module is used for acquiring direct current energy from the centralized energy storage module, modulating the acquired direct current voltage, constructing a target voltage source with adjustable voltage amplitude and phase, forming current based on the voltage difference of the target voltage source and the alternating current bus voltage, and realizing power exchange between the device and a power grid.
Furthermore, a transformer is arranged between the alternating current bus and the converter main circuit module, one end of the transformer connected with the alternating current bus is in an angle connection mode, and one end of the transformer connected with the converter main circuit module is in a Y connection mode.
Further, the input end of the main circuit in the converter main circuit module is respectively connected with the voltage output end of the transformer.
Further, the sub-module is a bridge circuit unit, wherein the bridge circuit unit is in a full-bridge structure or a half-bridge structure.
Further, the bridge circuit unit includes: the circuit comprises a first branch circuit, a second branch circuit and a control circuit, wherein the first branch circuit is provided with a first switch and a second switch, and each of the first switch and the second switch comprises a transistor;
the first switch comprises a first load terminal, a second load terminal, a first control terminal, and a second control terminal, the second control terminal being electrically isolated from the first control terminal of the first switch;
the second switch includes a third load terminal, a fourth load terminal, and a third control terminal electrically connected to the second load terminal of the first switch.
Further, the bridge circuit unit includes: the power supply comprises a first branch and a second branch which is connected with the first branch in parallel, wherein the first branch comprises a plurality of power devices, the power devices are connected in an H-bridge mode, and a circuit is arranged on the second branch.
Further, the centralized energy storage module at least comprises one of the following: battery, super capacitor, hydrogen energy and compressed air energy storage.
According to another aspect of the embodiments of the present application, there is also provided a grid transient voltage support method, which is applied to the above static voltage active support device for grid transient voltage support, and includes:
detecting the current voltage supporting capacity of the power grid;
acquiring energy from the centralized energy storage module under the condition that the voltage supporting capacity is lower than a preset threshold value;
modulating the direct-current voltage of the centralized energy storage module by using the energy to construct a target voltage source with adjustable voltage amplitude and phase;
transient voltage support is performed on the power grid based on the target voltage source.
Further, the performing transient voltage support on the grid based on the target voltage source includes:
determining a voltage difference between a target voltage source and an ac bus voltage, and forming a current based on the voltage difference, wherein the ac bus is used to connect the converter main circuit module and the grid;
performing a power exchange between the voltage active support device and the grid based on the current to complete transient voltage support of the grid.
According to another aspect of the embodiments of the present application, there is also provided a storage medium including a stored program which performs the above steps when the program is executed.
According to another aspect of the embodiments of the present application, there is also provided an electronic apparatus, including a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete communication with each other through the communication bus; wherein: a memory for storing a computer program; a processor for executing the program stored in the memory to execute the steps of the method.
Embodiments of the present application further provide a computer program product containing instructions, which when executed on a computer, cause the computer to perform the steps of the above method.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: the concentrated energy storage module connected with the main circuit module of the converter is arranged, so that the target voltage can be constructed independently, the rapid response can be realized during the fault, and the transient voltage active support is provided for the system. In addition, the device has the advantages of low manufacturing cost, simple maintenance, no increase of short-circuit current level and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic diagram of a voltage active supporting apparatus facing a grid transient voltage support according to an embodiment of the present disclosure;
fig. 2 is a topology structure diagram of a main circuit module of a converter according to an embodiment of the present application;
fig. 3 is a schematic diagram of a half-bridge structure of a sub-module according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a full-bridge structure of a sub-module according to an embodiment of the present disclosure.
Detailed Description
In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments, and the illustrative embodiments and descriptions thereof of the present application are used for explaining the present application and do not constitute a limitation to the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another similar entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation 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 may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a voltage active supporting device for power grid transient voltage support. Fig. 1 is a schematic diagram of a voltage active supporting apparatus facing a grid transient voltage support according to an embodiment of the present application, as shown in fig. 1, the apparatus includes: the energy storage device comprises a converter main circuit module 10 and a centralized energy storage module 20, wherein the converter main circuit module 10 is connected with an equivalent power grid module through an alternating current bus 30, the converter main circuit module 10 is connected with the centralized energy storage module 20 through a coupling circuit so as to enable the converter main circuit module and the centralized energy storage module to exchange energy, and the equivalent power grid module enables a power system to be equivalent to a voltage source series impedance;
and the converter main circuit module 10 is used for acquiring direct current energy from the centralized energy storage module, modulating the acquired direct current voltage, constructing a target voltage source with adjustable voltage amplitude and phase, forming current based on the voltage difference between the target voltage source and the alternating current bus voltage, and realizing power exchange between the device and a power grid.
In the embodiment of the present application, a transformer is disposed between the ac bus and the converter main circuit module, an end of the transformer connected to the ac bus is connected in an angle joint manner, and an end of the transformer connected to the converter main circuit module is connected in a Y joint manner.
In an embodiment of the present application, a converter main circuit module includes: the input end of the main circuit is respectively connected with the voltage output ends in the transformer, the main circuits are connected in a star connection cascade mode, the main circuit comprises a plurality of sub-modules which are connected in series, and different main circuits are connected with different voltage output ends. The converter modulates the voltage on the direct current capacitor through the on/off combination of different internal power electronic devices to construct a voltage source with adjustable voltage and phase, so as to further realize the adjustment of the amplitude and the phase of the current on the connecting reactance of the flow channel and realize the exchange of active/reactive power between the converter and the power grid.
As an example, as shown in fig. 2, the topology of the converter main circuit module includes a three-phase main circuit, a first phase main circuit a is connected to the first voltage output terminal Va of the converter, a second phase main circuit b is connected to the second voltage output terminal Vb of the converter, and a third phase main circuit c is connected to the third voltage output terminal Vc of the converter.
Specifically, the first main path a includes a first branch and a second branch, the first branch is provided with a first inductor L1, sub-modules SM a11, SM a12, SM. The second branch circuit is provided with a second inductor L2 connected in series, and sub-modules SM a21, SM a22, SM a2n, wherein the sub-module SM a2n is connected with a sub-module SM b2n of the second main circuit b.
The second main circuit b comprises a third branch circuit and a fourth branch circuit, the third branch circuit is provided with a third inductor L3, sub-modules SM b11, SM b12, SM, SM b1n which are connected in series, and the sub-module SM b1n is connected with a sub-module SM c2n of the third main circuit c. A fourth inductor L4 connected in series is arranged on the second branch circuit, sub-modules SM b21, SM b22, SM b2n are arranged, and the sub-module SM b2n is connected with the sub-module SM c2n of the third main circuit c.
The third main circuit c comprises a fifth branch circuit and a sixth branch circuit, a fifth inductor L5 and sub-modules SM c11, SM c12, SM, SM c1n which are connected in series are arranged on the fifth branch circuit, and the sub-modules SM c1n are connected with the output of the converter main circuit module in the forward direction. And a sixth inductor L6 and sub-modules SM c21, SMc22, SM c2n which are connected in series are arranged on the sixth branch, and the sub-module SM c2n is connected with the output negative direction of the converter main circuit module.
In the embodiment of the present application, the sub-module is a bridge circuit unit, wherein the bridge circuit unit is in a full-bridge structure or a half-bridge structure.
Fig. 3 is a schematic diagram of a half-bridge structure provided by an embodiment of the present application, and as shown in fig. 3, a bridge circuit unit includes: the circuit comprises a first branch circuit, a second branch circuit and a control circuit, wherein the first branch circuit is provided with a first switch and a second switch, and each of the first switch and the second switch comprises a transistor; the first switch includes a first load terminal, a second load terminal, a first control terminal, and a second control terminal, the second control terminal being electrically isolated from the first control terminal of the first switch; the second switch includes a third load terminal, a fourth load terminal, and a third control terminal electrically connected to the second load terminal of the first switch.
Fig. 4 is a schematic diagram of a half-bridge structure provided by an embodiment of the present application, and as shown in fig. 4, a bridge circuit unit includes: the power supply comprises a first branch and a second branch which is connected with the first branch in parallel, wherein the first branch comprises a plurality of power devices which are connected in an H-bridge mode, and a circuit is arranged on the second branch.
In the embodiment of the application, the coupling circuit is a DC-DC converter.
In an embodiment of the present application, the centralized energy storage module includes at least one of: battery, super capacitor, hydrogen energy and compressed air energy storage.
The voltage active supporting device for the transient voltage support of the power grid can support voltage stability under the working conditions of large disturbance and small disturbance of the power grid, and voltage support is achieved by constructing a stable voltage source through a converter main circuit module inside the device. The device has the advantages of quick response, active voltage support, low manufacturing cost, simple maintenance, no increase of short-circuit current level and the like.
The embodiment of the present application further provides a power grid transient voltage support method, which is applied to the static voltage active support device for power grid transient voltage support, and the method includes:
and S11, detecting the current voltage supporting capability of the power grid.
In the embodiment of the present application, the process of detecting the current voltage supporting capability of the power grid is as follows: determining the operation information of a unit in the current power grid; determining the ratio of the maximum power supply load increment of the power grid to the preset capacity when the load is continuously increased and disturbed in the current operation state according to the operation mode corresponding to the operation information of the unit; and determining the voltage supporting capacity of the unit group according to the ratio of the maximum power supply load increment of the receiving-end power grid to the unit starting capacity when the load of the unit group continuously increases and disturbs.
And S12, acquiring energy from the centralized energy storage module under the condition that the voltage supporting capacity is lower than a preset threshold value.
In the embodiment of the application, in order to ensure that the voltage support is timely and effectively provided for the power grid under the condition that the voltage support capability of the power grid is insufficient, a preset threshold value is set, and when the voltage support capability of the power grid is lower than the preset threshold value, pre-stored energy is immediately obtained from the centralized energy storage module. It should be noted that the energy in the centralized energy storage module is converted when the voltage of the power grid is higher.
And S13, modulating the direct current voltage of the centralized energy storage module by using energy, and constructing a target voltage source with adjustable voltage amplitude and phase.
In this embodiment of the present application, the energy is used to modulate the dc voltage of the energy storage unit, and a target voltage source with adjustable voltage amplitude and phase is constructed, including: tracking the voltage phase of the alternating current bus by using energy to obtain the voltage phase and amplitude of a modulation wave, wherein the voltage phase of the modulation wave lags behind the voltage phase of the equivalent power grid module, and the voltage amplitude of the modulation wave is lower than that of the equivalent power grid module; and constructing the target voltage source based on the voltage phase and amplitude of the modulation wave. Therefore, the phenomena of power angle instability and overhigh voltage are prevented, and the stability of the power system is improved.
And S14, carrying out transient voltage support on the power grid based on the target voltage source.
In this application embodiment, the transient voltage support of the power grid based on the target voltage source includes: determining a voltage difference between a target voltage source and the voltage of an alternating current bus, and forming current based on the voltage difference, wherein the alternating current bus is used for connecting a converter main circuit module and a power grid; and carrying out power exchange between the voltage active supporting device and the power grid based on the current so as to complete transient voltage support of the power grid.
In yet another embodiment provided by the present application, there is also provided a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform the above-described embodiments.
In yet another embodiment provided herein, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the above-described embodiments.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk), among others.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A static voltage active supporting device for supporting transient voltage of a power grid is characterized by comprising: transverter main circuit module and concentrated energy storage module, transverter main circuit module is connected through alternating current bus and equivalent electric wire netting module, transverter main circuit module pass through coupling circuit with concentrated energy storage module connects to make transverter main circuit module with concentrated energy storage module carries out the exchange of energy, transverter main circuit module includes: the main circuit comprises a plurality of sub-modules connected in series, wherein different main circuits are connected with different voltage output ends;
the converter main circuit module is used for acquiring direct current energy from the centralized energy storage module, modulating the acquired direct current voltage, constructing a target voltage source with adjustable voltage amplitude and phase, forming current based on the voltage difference of the target voltage source and the alternating current bus voltage, and realizing power exchange between the device and a power grid.
2. The apparatus as claimed in claim 1, wherein a transformer is provided between the ac bus and the converter main circuit module, wherein one end of the transformer connected to the ac bus is connected in an angle joint manner, and one end of the transformer connected to the converter main circuit module is connected in a Y joint manner.
3. The apparatus of claim 2 wherein the input terminals of the main circuit in the converter main circuit module are connected to the voltage output terminals in the transformer, respectively.
4. The apparatus of claim 3, wherein the sub-module is a bridge circuit unit, wherein the bridge circuit unit is in a full-bridge configuration or a half-bridge configuration.
5. The apparatus of claim 4, wherein the bridge circuit unit comprises: the circuit comprises a first branch circuit, a second branch circuit and a control circuit, wherein the first branch circuit is provided with a first switch and a second switch, and each of the first switch and the second switch comprises a transistor;
the first switch includes a first load terminal, a second load terminal, a first control terminal, and a second control terminal, the second control terminal being electrically isolated from the first control terminal of the first switch;
the second switch includes a third load terminal, a fourth load terminal, and a third control terminal electrically connected to the second load terminal of the first switch.
6. The apparatus of claim 4, wherein the bridge circuit unit comprises: the power device comprises a first branch and a second branch which is connected with the first branch in parallel, wherein the first branch comprises a plurality of power devices which are connected in an H-bridge manner, and a circuit is arranged on the second branch.
7. The apparatus of claim 1, wherein the centralized energy storage module comprises at least one of: battery, super capacitor, hydrogen energy and compressed air energy storage.
8. A grid transient voltage support method applied to the static voltage active support device for grid transient voltage support according to any one of claims 1 to 7, comprising:
detecting the current voltage supporting capacity of the power grid;
acquiring energy from a centralized energy storage module under the condition that the voltage supporting capacity is lower than a preset threshold value;
modulating the direct-current voltage of the centralized energy storage module by using the energy to construct a target voltage source with adjustable voltage amplitude and phase;
transient voltage support is performed on the power grid based on the target voltage source.
9. The method of claim 8, wherein the transient voltage support of the grid based on the target voltage source comprises:
determining a voltage difference between a target voltage source and an ac bus voltage for connecting the converter main circuit module and the grid and forming a current based on the voltage difference;
performing a power exchange between the voltage active support device and the grid based on the current to complete transient voltage support of the grid.
CN202211344104.5A 2022-10-31 2022-10-31 Static voltage active supporting device and method for power grid transient voltage support Pending CN115549141A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211344104.5A CN115549141A (en) 2022-10-31 2022-10-31 Static voltage active supporting device and method for power grid transient voltage support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211344104.5A CN115549141A (en) 2022-10-31 2022-10-31 Static voltage active supporting device and method for power grid transient voltage support

Publications (1)

Publication Number Publication Date
CN115549141A true CN115549141A (en) 2022-12-30

Family

ID=84717856

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211344104.5A Pending CN115549141A (en) 2022-10-31 2022-10-31 Static voltage active supporting device and method for power grid transient voltage support

Country Status (1)

Country Link
CN (1) CN115549141A (en)

Similar Documents

Publication Publication Date Title
Gwon et al. Mitigation of voltage unbalance by using static load transfer switch in bipolar low voltage DC distribution system
CN101258670A (en) Equipment used for transferring electric energy
CN107846036B (en) High-voltage flexible direct-current transmission system and main loop equipment determination method thereof
KR20000069391A (en) Apparatus for and method of evenly distributing an electrical load across an n-phase power distribution network
CN206099366U (en) Ambipolar photovoltaic power generation system
CN111697626A (en) Photovoltaic power station, power generation control method and string inverter
US12074444B2 (en) Power system
JP2009273355A (en) Apparatus for transmitting electric power
CN113271009A (en) DC/DC conversion unit and energy conversion system
US11456660B2 (en) Grounding scheme for power conversion system
CN115549141A (en) Static voltage active supporting device and method for power grid transient voltage support
CN215267650U (en) Low-frequency power transmission system based on grounding structure
CN115528729A (en) Static voltage active supporting device for power grid transient voltage support
CN116031906A (en) Static voltage active supporting device and method for power grid transient voltage support
Johnsana et al. A new shunt hybrid active power filter configuration research and implementation for enhancement of power quality
CN206461358U (en) A kind of flexible tuner of frequency conversion and half-wavelength AC transmission system
CN111614116B (en) Grounding method and device of flexible direct current system
CN114977168A (en) Power supply system and power supply method
CN113141010A (en) Bipolar DC power supply circuit
Tanaka et al. The HVDC power supply system implementation in NTT group and next generation power supply system
CN116073379B (en) Main loop parameter design method, system, equipment and medium of flexible interconnection switch
CN215646207U (en) Offshore wind power station sending end converter circuit and offshore direct current transmission system
Milani et al. Measurement and analysis of base transceiver stations power quality parameters and assessment of its unfavourable effects on Iran distribution systems
US20240088798A1 (en) Alternating current/direct current power conversion system
CN212210510U (en) Flexible direct current system's earthing device and flexible direct current system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination