CN113488978B - Coordination control method for multiple arc suppression coils of power grid - Google Patents
Coordination control method for multiple arc suppression coils of power grid Download PDFInfo
- Publication number
- CN113488978B CN113488978B CN202110783859.4A CN202110783859A CN113488978B CN 113488978 B CN113488978 B CN 113488978B CN 202110783859 A CN202110783859 A CN 202110783859A CN 113488978 B CN113488978 B CN 113488978B
- Authority
- CN
- China
- Prior art keywords
- arc suppression
- compensation
- power grid
- suppression coil
- coils
- 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.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
-
- 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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a coordinated control method for a plurality of arc suppression coils of a power grid, which is applied to the same power grid comprising a plurality of compensation branches arranged in parallel and comprises the following steps: each arc suppression coil compensation device is respectively provided with a measurement module with a communication function; setting the arc suppression coil compensation device on one compensation branch as a host, and setting the arc suppression coil compensation devices on the other compensation branches as slaves; encoding the slave measurement module; the slave arc suppression coil compensation devices perform independent compensation control respectively, the master arc suppression coil compensation device accurately calculates the capacitive reactive capacity of the line to the ground according to the current real-time impedance data of each compensation branch, balances the capacitive reactive difference behind each compensation branch, controls the arc suppression coils to adjust gears, and completes difference compensation. The invention solves the problem that a plurality of arc suppression coils arranged in the same power grid at different places and arc suppression coils of different manufacturers in the same station can not be compensated coordinately, and provides reliable guarantee for the safe operation of the power grid.
Description
Technical Field
The invention relates to the technical field of power distribution of a power system, in particular to a coordination control method for a plurality of arc suppression coils of a power grid.
Background
In a 6-66 kV power grid neutral point arc suppression coil grounding system, the modes that different transformer substations in the same power grid operate arc suppression coils of different manufacturers in parallel and arc suppression coils of different manufacturers in the same station in the same power grid often exist. However, each arc suppression coil may come from different manufacturers or from the same manufacturer in different production periods, and when products of different manufacturers or products in different production periods run in parallel, due to the fact that parameters of the devices are not shared and incompatible, and the existence of the respective arc suppression coil and the damping resistor is combined, the capacitance and current measurement of the system is inaccurate. Therefore, the problems of respective fighting, compensation capacity preemption and the like frequently occur in the tracking and measuring process of the arc extinction automatic control device in the conventional power system, so that the ground compensation capacity in the same power grid system is incorrect, and the potential hazard is brought to the safe operation of the power grid.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a coordination control method for a plurality of arc suppression coils, which can coordinate and control arc suppression coil devices of different specifications and models and different manufacturers in the same power grid, thereby ensuring that the system can obtain timely and reasonable grounding compensation effect and providing reliable guarantee for the safe operation of the power grid.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows.
A coordinated control method for a plurality of arc suppression coils of a power grid is applied to the same power grid comprising a plurality of compensation branches which are arranged in parallel, each compensation branch is provided with an arc suppression coil compensation device, and each arc suppression coil compensation device comprises a grounding transformer, an arc suppression coil and a damping resistor which are connected between a bus and the ground in series; the control method specifically comprises the following steps:
a) Each arc suppression coil compensation device is respectively provided with a measurement module which collects voltage and current vectors of a compensation branch and has a communication function;
b) Setting the arc suppression coil compensation device on one compensation branch as a host, setting the arc suppression coil compensation devices on the other compensation branches as slaves, and respectively sending the measurement result of each measurement module to the host arc suppression coil compensation device through each communication module;
c) Coding each measurement module to form a distributed measurement and control network;
d) The slave arc suppression coil compensation devices perform independent compensation control respectively, the master arc suppression coil compensation device accurately calculates the capacitive reactive capacity of the line to the ground according to the current real-time impedance data of the corresponding compensation branch circuits sent by the measurement modules in the measurement and control network, balances the capacitive reactive difference behind the compensation branch circuits, controls the arc suppression coils of the master arc suppression coil compensation device to adjust gears, and completes difference compensation.
According to the coordination control method for the multiple arc suppression coils of the power grid, the measuring module is respectively and electrically connected with the voltage transformers connected to the two ends of the arc suppression coils in parallel and the current transformers connected between the damping resistor and the ground in series.
According to the coordination control method for the multiple arc suppression coils of the power grid, the measuring module comprises an independently arranged communication module.
According to the coordination control method for the multiple arc suppression coils of the power grid, the voltage acquisition circuit, the current acquisition circuit, the AD conversion circuit and the single chip microcomputer are arranged in the measurement module, and the input end of the single chip microcomputer is connected with the output ends of the voltage acquisition circuit and the current acquisition circuit through the AD conversion circuit respectively.
The coordination control method for the multiple arc suppression coils of the power grid is characterized in that for the power grid system in which the arc suppression coils of different manufacturers run in parallel among different transformer substations in the same power grid, the communication module is a GPRS communication module capable of realizing long-distance wireless communication.
According to the coordination control method for the multiple arc suppression coils of the power grid, for the power grid system in which the arc suppression coils of different manufacturers are operated in parallel in the same transformer substation in the same power grid, the communication module adopts a short-distance wireless communication mode or a wired communication mode, wherein the communication module is a Lora communication module when the short-distance wireless communication is adopted.
Due to the adoption of the technical scheme, the technical progress of the invention is as follows.
The invention is characterized in that a distributed measurement module and a communication module are arranged on zero sequence loops of a plurality of arc suppression coils which run in parallel between different transformer substations or in the same transformer substation in the same power grid system, the running voltage and current of the parallel arc suppression coils are measured in real time, data are transmitted to a main arc suppression coil compensation device through a network, the main arc suppression coil compensation device accurately calculates the ground capacitive reactive capacity of a power supply line according to the real-time impedance data of a compensation branch where each slave arc suppression coil compensation device is located in a measurement and control network, balances the capacitive reactive difference after each arc suppression coil compensation, controls the main arc suppression coil to adjust gears, realizes difference compensation and achieves the purpose of precise compensation.
When the bus coupler switch is switched off, the main machine controller automatically adjusts a compensation strategy according to a parallel state, the distribution measurement and control system measures and calculates a multi-machine system in a full-parameter mode in a wireless or wired communication mode, and automatically compensates in a self-adaptive balance difference control mode, so that arc suppression coil control devices produced by different manufacturers at different periods can be compatible, an existing arc suppression control system is not changed, communication among the controllers is not needed, the problem that parallel application cannot be realized due to incompatibility of protocol protocols among different manufacturers is solved, the problem that multiple arc suppression coils arranged in the same power grid at different places and arc suppression coils of different manufacturers in the same station cannot be coordinately compensated is solved, and reliable guarantee is provided for safe operation of the power grid.
Drawings
FIG. 1 is a wiring diagram of the system of the present invention;
FIG. 2 is a flow chart of the present invention;
fig. 3 is a power grid equivalent circuit diagram.
Wherein: r1, R2 and Rn are equivalent resistances; XL1, XL2, xln. Equivalent inductive reactance; xc, system equivalent capacitive reactance to ground; ac, system unbalance voltage; jdb. Grounding transformer; XH arc suppression coil; PT, voltage transformer; KKG, a control switch; r, damping resistance, d, grounding point.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
A coordinated control method for multiple arc suppression coils of a power grid is applied to the same power grid comprising a plurality of compensation branches arranged in parallel, and comprises the following steps: the method is used for coordinating the arc suppression coils to compensate the power grid system in the control network of the arc suppression coils of different manufacturers operating in parallel in the same power grid and different transformer substations or in the control network of the arc suppression coils of different manufacturers operating in parallel in the same power grid and the same station.
Each compensation branch is provided with an arc suppression coil compensation device, and each arc suppression coil compensation device comprises a grounding transformer JDB, an arc suppression coil XH and damping resistors R1-Rn which are connected between the bus and the ground in series; each arc suppression coil compensation device is respectively provided with a measuring module and a communication module, the measuring modules and the communication modules on each compensation branch circuit are connected through data lines, the communication modules on different arc suppression coil compensation devices are communicated with each other through a wireless or wired network, and a power grid system is shown in figure 1. Of course, the measuring module and the communication module can be combined into an integral device.
The method is applied to the same power grid, the control flow of the method is shown in fig. 2, and the method for performing coordinated control on each arc suppression coil compensation device specifically comprises the following steps.
A) Firstly, a measuring module with a communication function is installed on each arc suppression coil compensating device, and certainly, the measuring module can also be an independent measuring module and an independent communication module, and then the measuring module is connected with a voltage transformer and a current transformer on each compensating branch circuit through cables.
In the invention, a measuring module is used for collecting the voltage vector and the current vector of a compensating branch circuit and calculating the complex impedance of the compensating branch circuit according to the voltage vector and the current vector, and the measuring module is respectively and electrically connected with a voltage transformer PT which is connected in parallel with two ends of an arc suppression coil and a current transformer which is connected in series between a damping resistor R and the ground.
The measuring module is internally provided with a voltage acquisition circuit, a current acquisition circuit, an AD conversion circuit and a single chip microcomputer, and the input end of the single chip microcomputer is respectively connected with the output ends of the voltage acquisition circuit and the current acquisition circuit through the AD conversion circuit. The voltage acquisition circuit is connected with the voltage transformer through a cable and is used for acquiring voltage vectors of the compensation branches; the current acquisition circuit is connected with the current transformer through a cable and is used for acquiring a current vector of the compensation branch; the input end of the AD conversion circuit is respectively connected with the output ends of the voltage acquisition circuit and the current acquisition circuit and is used for converting the acquired analog quantity into digital quantity and sending the digital quantity to the singlechip; and the singlechip calculates the real-time impedance data of the compensation branch circuit according to the acquisition value sent by the AD conversion circuit.
The communication module is mainly used for realizing data communication among the compensation branches, and can be wireless communication, wired communication or the combination of the wireless communication and the wired communication; the wireless communication generally adopts a GPRS communication module, a Lora communication module or other short-distance wireless communication modules, and the wired communication can adopt a cable for communication. When the communication module is applied to a power grid system in which arc suppression coils of different manufacturers run in parallel among different transformer substations in the same power grid, the communication module is a GPRS communication module capable of realizing long-distance wireless communication; when the communication module is applied to a power grid system in which arc suppression coils of different manufacturers run in parallel in the same transformer substation in the same power grid, the communication module adopts a short-distance wireless communication mode or a wired communication mode, wherein the communication module is a Lora communication module when the short-distance wireless communication is adopted.
B) And secondly, arranging the arc suppression coil compensation device on one compensation branch as a host, and arranging the arc suppression coil compensation devices on the other compensation branches as slaves. Each measuring module can be mutually communicated with the arc suppression coil compensating device and the host through the respective communication module, and the measuring result is respectively sent to the respective arc suppression coil compensating device and the host through the respective communication module.
C) And coding the measurement modules to form a distributed measurement and control network, and finishing the installation work. The power grid equivalent circuit diagram constructed by the invention is shown in fig. 3, wherein R1, R2 and Rn are equivalent resistances of each compensation branch circuit respectively; XL1, XL2 and XLN are respectively equivalent inductive reactance of each compensation branch; xc is the system equivalent capacitive reactance to ground; AC is the system imbalance voltage.
D) When the system compensates, each slave arc suppression coil compensation device carries out independent compensation control, the master arc suppression coil compensation device accurately calculates the line-to-ground capacitive reactive capacity in the power grid system according to the received current real-time impedance data of the corresponding compensation branch circuit sent by each measurement module in the measurement and control network, balances the capacitive reactive difference behind each compensation branch circuit, and then sends a gear shifting instruction to the arc suppression coil of the compensation branch circuit where the master arc suppression coil compensation device is located, so that accurate compensation is realized.
Claims (5)
1. A coordinated control method for a plurality of arc suppression coils of a power grid is applied to the same power grid comprising a plurality of compensation branches which are arranged in parallel, each compensation branch is provided with an arc suppression coil compensation device, and each arc suppression coil compensation device comprises a grounding transformer, an arc suppression coil and a damping resistor which are connected between a bus and the ground in series; the control method is characterized by comprising the following steps:
a) Each arc suppression coil compensation device is respectively provided with a measurement module for acquiring voltage and current vectors of a compensation branch, and the measurement module comprises an independently arranged communication module;
b) Setting the arc suppression coil compensation device on one compensation branch as a host, setting the arc suppression coil compensation devices on the other compensation branches as slaves, and respectively sending the measurement result of each measurement module to the host and the respective arc suppression coil compensation device through the respective communication module;
c) Coding each measurement module to form a distributed measurement and control network;
d) The slave arc suppression coil compensation devices perform independent compensation control respectively, the master arc suppression coil compensation device accurately calculates the capacitive reactive capacity of the line to the ground in the power grid system according to the current real-time impedance data of the corresponding compensation branch circuits sent by each measurement module in the measurement and control network, balances the capacitive reactive difference behind each compensation branch circuit, and then sends a gear shifting instruction to the arc suppression coil of the compensation branch circuit where the master arc suppression coil compensation device is located, and the difference compensation is completed.
2. The power grid multi-arc suppression coil coordination control method according to claim 1, characterized in that: and the measuring module is respectively and electrically connected with a voltage transformer which is connected in parallel at two ends of the arc suppression coil and a current transformer which is connected in series between the damping resistor and the ground.
3. The method for coordinately controlling a plurality of arc suppression coils in a power grid according to claim 2, characterized in that: the measuring module is internally provided with a voltage acquisition circuit, a current acquisition circuit, an AD conversion circuit and a single chip microcomputer, the input end of the single chip microcomputer is respectively connected with the output ends of the voltage acquisition circuit and the current acquisition circuit through the AD conversion circuit, and the single chip microcomputer is interconnected with the communication module.
4. The method for coordinately controlling a plurality of arc suppression coils in a power grid according to claim 3, wherein: and for the power grid system in which arc suppression coils of different manufacturers run in parallel between different transformer substations in the same power grid, the communication module is a GPRS communication module capable of realizing long-distance wireless communication.
5. The method for coordinately controlling a plurality of arc suppression coils in a power grid according to claim 3, wherein: for the power grid system in which arc suppression coils of different manufacturers run in parallel in the same transformer substation in the same power grid, the communication module adopts a short-distance wireless communication mode or a wired communication mode, wherein the communication module is a Lora communication module when the short-distance wireless communication is adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110783859.4A CN113488978B (en) | 2021-07-12 | 2021-07-12 | Coordination control method for multiple arc suppression coils of power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110783859.4A CN113488978B (en) | 2021-07-12 | 2021-07-12 | Coordination control method for multiple arc suppression coils of power grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113488978A CN113488978A (en) | 2021-10-08 |
| CN113488978B true CN113488978B (en) | 2022-11-22 |
Family
ID=77938097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110783859.4A Active CN113488978B (en) | 2021-07-12 | 2021-07-12 | Coordination control method for multiple arc suppression coils of power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113488978B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106502131A (en) * | 2016-11-11 | 2017-03-15 | 唐山东唐电器设备有限公司 | New arc suppression coil control system based on internet platform |
| CN107565581A (en) * | 2017-09-08 | 2018-01-09 | 许继电气股份有限公司 | Reactive power compensator parallel running system and power-less compensation control method |
| CN108365681A (en) * | 2018-02-28 | 2018-08-03 | 国网江苏省电力有限公司徐州供电分公司 | More arc suppression coil integrated management devices and monitoring method |
| CN109214618A (en) * | 2017-06-29 | 2019-01-15 | 平高集团有限公司 | A kind of rural power grids part reactive compensation dispensing control method and device |
| CN111555295A (en) * | 2020-04-28 | 2020-08-18 | 国网河北省电力有限公司电力科学研究院 | Online coordination control method for multiple reactive power compensation devices in regional power grid |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299520B (en) * | 2011-09-02 | 2013-08-14 | 北京四方华能电气设备有限公司 | Reactive power compensation method and system for micro power grid |
| CN203014374U (en) * | 2012-11-30 | 2013-06-19 | 华北电力大学 | A distributed arc extinguishing coil controller device based on optical fiber communication |
-
2021
- 2021-07-12 CN CN202110783859.4A patent/CN113488978B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106502131A (en) * | 2016-11-11 | 2017-03-15 | 唐山东唐电器设备有限公司 | New arc suppression coil control system based on internet platform |
| CN109214618A (en) * | 2017-06-29 | 2019-01-15 | 平高集团有限公司 | A kind of rural power grids part reactive compensation dispensing control method and device |
| CN107565581A (en) * | 2017-09-08 | 2018-01-09 | 许继电气股份有限公司 | Reactive power compensator parallel running system and power-less compensation control method |
| CN108365681A (en) * | 2018-02-28 | 2018-08-03 | 国网江苏省电力有限公司徐州供电分公司 | More arc suppression coil integrated management devices and monitoring method |
| CN111555295A (en) * | 2020-04-28 | 2020-08-18 | 国网河北省电力有限公司电力科学研究院 | Online coordination control method for multiple reactive power compensation devices in regional power grid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113488978A (en) | 2021-10-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101043572B1 (en) | Distribution Automation System and its voltage control method for reactive power compensation | |
| CN102157936B (en) | Coordination control method | |
| CN104578042B (en) | Improved droop control method for direct current micro-grid | |
| CN103081345A (en) | Generator set calibration controller | |
| CN108562815A (en) | Power grid utility power quality control and monitoring system | |
| CN113488978B (en) | Coordination control method for multiple arc suppression coils of power grid | |
| CN103513154A (en) | Power distribution network electric leakage signal on-line detection device | |
| CN201878088U (en) | Automatic voltage regulator of switching voltage regulator (SVR) line | |
| CN114781021A (en) | Intelligent calculation and design drawing generation method and system for low-voltage power distribution system | |
| CN215009765U (en) | Many arc suppression coil coordinated control system of electric wire netting | |
| CN201550064U (en) | Multi-motor synchronous control device | |
| CN103197641B (en) | Power Plant stage load and voltage integration automatic control system | |
| CN202563049U (en) | Small current neutral grounding wire selection device base on layering distribution | |
| CN205656273U (en) | A three -phase power -frequency withstand voltage test device for among cable accessories salt atmosphere test | |
| CN201266837Y (en) | Automatic tracking compensation arc-extinguishing device for embedded work control model with touch screen | |
| CN103081346A (en) | Generator set calibration controller | |
| CN108344906A (en) | A kind of blowout coil set apparatus analog simulation testing stand | |
| CN201570857U (en) | Low-current earthing line selection device based on distributed measurement technology | |
| CN210401533U (en) | Bus main line thermal cycle testing device | |
| CN207037031U (en) | Switching equipment temperature rise experimental rig | |
| CN105071371A (en) | Arc-suppression coil device self-communication connection control method and connection board | |
| CN210323235U (en) | Measurement and control module for low-voltage compensation capacitor cabinet of submerged arc furnace | |
| CN211505735U (en) | High-performance test system for pump | |
| CN210665864U (en) | Single-phase grounding capacitance current testing device of high-voltage power grid | |
| CN201797323U (en) | Automatic capacitance-adjusting capacitor device |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |