CN106451759B - Micro-grid monitoring system based on power line carrier communication - Google Patents
Micro-grid monitoring system based on power line carrier communication Download PDFInfo
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- CN106451759B CN106451759B CN201510478336.3A CN201510478336A CN106451759B CN 106451759 B CN106451759 B CN 106451759B CN 201510478336 A CN201510478336 A CN 201510478336A CN 106451759 B CN106451759 B CN 106451759B
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- 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
- Y04S40/121—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 the power network as support for the transmission
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- 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
- Y04S40/124—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 wired telecommunication networks or data transmission busses
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Abstract
The invention provides a micro-grid monitoring system based on power line carrier communication, which comprises a micro-grid master control unit, a distributed power supply monitoring unit, an energy storage monitoring unit, a micro-grid load monitoring unit and a grid-connected point monitoring unit which are communicated with each other through a PLC power line carrier. The monitoring system provided by the invention can couple the communication signal to the power line for communication, takes the power line as a communication channel, and can greatly reduce the laying of communication lines in the microgrid through the communication system constructed by the PLC, thereby not only reducing the engineering quantity, but also meeting the communication requirement of the microgrid. The carrier signal of the PLC communication system may be transmitted on both a direct current line and an alternating current line. The PLC communication is matched with other communication technologies, so that the communication service of the micro-grid can be better completed.
Description
Technical Field
The invention relates to the field of power system communication, in particular to a micro-grid monitoring system based on power line carrier communication.
Background
The micro-grid is an important part of the smart grid, and the micro-grid communication system is an important part of the smart grid for representing intelligence. Power Line Communication (PLC) has a wide application value in a micro grid monitoring system due to its unique advantages.
The existing micro-grid communication usually adopts optical fibers, twisted pairs, wireless and the like for communication. The optical fiber is brittle in texture, poor in mechanical strength and inconvenient to lay and construct, and is particularly difficult to lay near a built and perfect load; twisted-pair cables also have problems with routing; although wireless communication has a wide coverage, reliability is a problem that cannot be ignored.
Therefore, it is necessary to design a microgrid monitoring system which can satisfy the complex and various characteristics of the communication technology of the microgrid monitoring system and can integrate various communication technologies.
Disclosure of Invention
In view of this, the microgrid monitoring system based on power line carrier communication provided by the invention can couple a communication signal to a power line for communication, the power line is used as a communication channel, and the communication system constructed by the PLC can greatly reduce the laying of communication lines in the microgrid, thereby not only reducing the amount of engineering, but also meeting the communication requirements of the microgrid. The carrier signal of the PLC communication system may be transmitted on both a direct current line and an alternating current line. The PLC communication is matched with other communication technologies, so that the communication service of the micro-grid can be better completed.
The purpose of the invention is realized by the following technical scheme:
a micro-grid monitoring system based on power line carrier communication is used for monitoring a micro-grid system connected to a power distribution network; the micro-grid system comprises a distributed power module, an energy storage module and a load module; the distributed power module, the energy storage module and the load module are connected with the power distribution network by using power lines provided with circuit breakers and overload protectors; a static switch is arranged on the power line between the power distribution network and the micro-grid;
the monitoring system comprises a micro-grid master control unit, a sub-control module and a grid-connected point monitoring unit which are communicated with each other through power line carriers.
Preferably, the sub-control module comprises a distributed power supply monitoring unit, an energy storage monitoring unit and a microgrid load monitoring unit;
the distributed power supply monitoring unit is used for monitoring the operation conditions of a wind power generation module and a photovoltaic power generation module in the distributed power supply module in real time and uploading the monitored operation data to the microgrid control unit;
the energy storage monitoring unit is used for monitoring the operation condition of the energy storage module in real time and uploading the monitored charging and discharging data to the micro-grid control unit;
the microgrid load monitoring unit is used for monitoring the operation condition of the load module in real time and uploading the monitored operation data to the microgrid control unit.
Preferably, the grid-connected point monitoring unit uploads the measured operation data and frequency data of the power distribution network to the microgrid control unit.
Preferably, the operation data comprises voltage, current, active power and reactive power values; the charging and discharging data comprise voltage, current, power and residual electric quantity values of charging and discharging of the energy storage system.
Preferably, the communication devices in the distributed power supply monitoring unit, the energy storage monitoring unit and the microgrid load monitoring unit are respectively connected with one end of each PLC carrier slave through respective ethernet interfaces, and the other end of each PLC carrier slave couples the communication signal to the power line of the unit accessory to which the PLC carrier slave belongs through a coupler.
Preferably, the communication equipment in the microgrid master control unit is connected with one end of a PLC (programmable logic controller) carrier host through an Ethernet interface, and the other end of the PLC carrier host couples a communication signal to a power line through a coupler; and a communication transmitter in the grid-connected point monitoring unit is connected with one end of each of 1 PLC (programmable logic controller) carrier slave machine by using an Ethernet interface of the communication transmitter, and the other end of each PLC carrier slave machine couples a communication signal to the power line through a coupler.
Preferably, the communication devices in the microgrid master control unit and the grid-connected point monitoring unit are respectively used in 1 optical network unit in an EPON optical fiber network to connect to the EPON optical fiber network; each optical network unit which is remained in the EPON optical fiber network is connected with one end of 1 PLC carrier host through an Ethernet interface; the other end of each PLC carrier host couples the communication signal to the power line through a coupler.
Preferably, a high-speed broadband PLC communication technology is adopted between the PLC carrier host and the PLC carrier host, the communication speed is 10-500 Mbit/s, and the communication distance is 0.5-1.5 kilometers.
Preferably, when the analog signal sampling point in the distributed power supply monitoring unit communicates with the distributed power supply monitoring unit, a narrow-band PLC communication technology is adopted between the analog signal sampling point and the distributed power supply monitoring unit, the communication rate is about 100k to 1Mbit/s, and the communication distance is 1 to 8 km; the analog signal sampling point comprises a photovoltaic array and a combiner box.
Preferably, if an inverter is connected between the distributed power supply module and the microgrid control unit, 1 coupler is arranged on each of two sides of the inverter, and 2 couplers are bridged by one connection line.
According to the technical scheme, the invention provides a microgrid monitoring system based on power line carrier communication, which comprises a microgrid master control unit, a distributed power supply monitoring unit, an energy storage monitoring unit, a microgrid load monitoring unit and a grid-connected point monitoring unit, wherein the microgrid master control unit, the distributed power supply monitoring unit, the energy storage monitoring unit, the microgrid load monitoring unit and the grid-connected point monitoring unit are mutually communicated through PLC power line carriers. The monitoring system provided by the invention can couple the communication signal to the power line for communication, takes the power line as a communication channel, and can greatly reduce the laying of communication lines in the microgrid through the communication system constructed by the PLC, thereby not only reducing the engineering quantity, but also meeting the communication requirement of the microgrid. The carrier signal of the PLC communication system may be transmitted on both a direct current line and an alternating current line. The PLC communication is matched with other communication technologies, so that the communication service of the micro-grid can be better completed.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
1. in the technical scheme provided by the invention, the system comprises a micro-grid master control unit, a distributed power supply monitoring unit, an energy storage monitoring unit, a micro-grid load monitoring unit and a grid-connected point monitoring unit which are communicated with each other through a PLC power line carrier. The monitoring system provided by the invention can couple the communication signal to the power line for communication, takes the power line as a communication channel, and can greatly reduce the laying of communication lines in the microgrid through the communication system constructed by the PLC, thereby not only reducing the engineering quantity, but also meeting the communication requirement of the microgrid.
2. According to the technical scheme provided by the invention, the carrier signal of the PLC communication system can be transmitted on a direct current line and can also be transmitted on an alternating current line. The PLC communication is matched with other communication technologies, so that the communication service of the micro-grid can be better completed.
3. The technical scheme provided by the invention has wide application and obvious social benefit and economic benefit.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a microgrid monitoring system based on power line carrier communication, which adopts all PLC communication technology;
fig. 2 is a schematic structural diagram of an embodiment of a micro-grid monitoring system based on power line carrier communication, which fully adopts PLC communication + optical fiber communication;
fig. 3 is a schematic wiring diagram of the monitoring system according to the present invention when an inverter is connected between the distributed power module and the microgrid control unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an embodiment in which all of the microgrid monitoring systems based on power line carrier communication employ PLC communication technology, and the monitoring systems are used for monitoring the microgrid systems connected to a power distribution network; the micro-grid system comprises a distributed power module, an energy storage module and a load module; the distributed power module, the energy storage module and the load module are connected with a power distribution network by power lines provided with circuit breakers and overload protectors; a static switch is arranged on a power line between the power distribution network and the microgrid;
the monitoring system comprises a micro-grid master control unit, a sub-control module and a grid-connected point monitoring unit which are communicated with each other through power line carriers.
The sub-control module comprises a distributed power supply monitoring unit, an energy storage monitoring unit and a micro-grid load monitoring unit;
the distributed power supply monitoring unit is used for monitoring the operating conditions of the wind power generation module and the photovoltaic power generation module in the distributed power supply module in real time and uploading the monitored operating data to the microgrid control unit;
the energy storage monitoring unit is used for monitoring the running state of the energy storage module in real time and uploading the monitored charging and discharging data to the microgrid control unit;
the micro-grid load monitoring unit is used for monitoring the operation condition of the load module in real time and uploading the monitored operation data to the micro-grid control unit.
And the grid-connected point monitoring unit uploads the measured running data and frequency data of the power distribution network to the micro-grid control unit.
The operation data comprises voltage, current, active power and reactive power values; the charging and discharging data comprise voltage, current, power and residual electric quantity values of charging and discharging of the energy storage system.
Communication equipment in the distributed power supply monitoring unit, the energy storage monitoring unit and the microgrid load monitoring unit are respectively connected with one end of each PLC carrier slave machine through respective Ethernet interfaces, and the other end of each PLC carrier slave machine couples communication signals to a power line of a unit accessory to which the PLC carrier slave machine belongs through a coupler.
The communication equipment in the micro-grid master control unit is connected with one end of the PLC carrier host through an Ethernet interface, and the other end of the PLC carrier host couples the communication signal to a power line through a coupler; the communication equipment in the grid-connected point monitoring unit is connected with one end of 1 PLC carrier slave machine by using an Ethernet interface of the communication equipment, and the other end of each PLC carrier slave machine couples communication signals to a power line through a coupler.
The PLC carrier host and the PLC carrier host adopt a high-speed broadband PLC communication technology, the communication speed is 10-500 Mbit/s, and the communication distance is 0.5-1.5 kilometers.
When the analog signal sampling point in the distributed power supply monitoring unit communicates with the distributed power supply monitoring unit, a narrow-band PLC communication technology is adopted between the analog signal sampling point and the distributed power supply monitoring unit, the communication speed is about 100 k-1 Mbit/s, and the communication distance is 1-8 kilometers; the analog signal sampling point comprises a photovoltaic array and a combiner box.
The PLC technology is a technology for transmitting data using a high voltage power line (35 kV in the field of PLC), a medium voltage power line (10kV), or a low voltage distribution line (380/220V) as a transmission medium. At present, the low-voltage distribution network line is widely applied to medium-voltage lines, and the application of the low-voltage distribution network line is already developed. In a microgrid monitoring system, the application of the PLC has the unique advantage that communication can be carried out on a power line without erecting a special communication network. In particular, PLC technology can also be used on the dc lines in the microgrid.
The micro-grid monitoring system based on the PLC has unique advantages in the aspect of micro-grid communication network erection. The micro-grid structure is complex and various, and comprises an alternating current micro-grid, a direct current micro-grid and an alternating current and direct current hybrid micro-grid. Monitoring of distributed power supplies in a microgrid requires the cooperation of various communication technologies. The micro-grid monitoring system based on the PLC can flexibly form a network, save the construction cost and shorten the construction period.
As shown in fig. 2, the present invention provides an embodiment in which all of the microgrid monitoring systems based on power line carrier communication employ PLC communication + optical fiber communication, and the monitoring systems are used for monitoring the microgrid systems connected to a power distribution network; the micro-grid system comprises a distributed power module, an energy storage module and a load module; the distributed power module, the energy storage module and the load module are connected with a power distribution network by power lines provided with circuit breakers and overload protectors; a static switch is arranged on a power line between the power distribution network and the microgrid;
the monitoring system comprises a micro-grid master control unit, a sub-control module and a grid-connected point monitoring unit which are communicated with each other through power line carriers.
The sub-control module comprises a distributed power supply monitoring unit, an energy storage monitoring unit and a micro-grid load monitoring unit;
the distributed power supply monitoring unit is used for monitoring the operating conditions of the wind power generation module and the photovoltaic power generation module in the distributed power supply module in real time and uploading the monitored operating data to the microgrid control unit;
the energy storage monitoring unit is used for monitoring the running state of the energy storage module in real time and uploading the monitored charging and discharging data to the microgrid control unit;
the micro-grid load monitoring unit is used for monitoring the operation condition of the load module in real time and uploading the monitored operation data to the micro-grid control unit.
And the grid-connected point monitoring unit uploads the measured running data and frequency data of the power distribution network to the micro-grid control unit.
The operation data comprises voltage, current, active power and reactive power values; the charging and discharging data comprise voltage, current, power and residual electric quantity values of charging and discharging of the energy storage system.
Communication equipment in the distributed power supply monitoring unit, the energy storage monitoring unit and the microgrid load monitoring unit are respectively connected with one end of each PLC carrier slave machine through respective Ethernet interfaces, and the other end of each PLC carrier slave machine couples communication signals to a power line of a unit accessory to which the PLC carrier slave machine belongs through a coupler.
Communication equipment in the micro-grid master control unit and the grid-connected point monitoring unit are respectively connected to the EPON optical fiber network by 1 optical network unit in the EPON optical fiber network; each Optical Network Unit (ONU) remaining in the EPON optical fiber network is connected with one end of 1 PLC carrier host through an Ethernet interface; the other end of each PLC carrier host couples the communication signal to the power line through a coupler.
The PLC carrier host and the PLC carrier host adopt a high-speed broadband PLC communication technology, the communication speed is 10-500 Mbit/s, and the communication distance is 0.5-1.5 kilometers.
When the analog signal sampling point in the distributed power supply monitoring unit communicates with the distributed power supply monitoring unit, a narrow-band PLC communication technology is adopted between the analog signal sampling point and the distributed power supply monitoring unit, the communication speed is about 100 k-1 Mbit/s, and the communication distance is 1-8 kilometers; the analog signal sampling point comprises a photovoltaic array and a combiner box.
As shown in fig. 3, a common feature of distributed power supplies is that an inverter is used to control the power quality in a power generation link, which may affect the PLC communication, because a converter circuit and a rectifier circuit in the inverter may affect a signal sent by the PLC, or even fail to pass through the signal. Therefore, if an inverter is connected between the distributed power supply module and the microgrid control unit, 1 coupler is arranged on each of two sides of the inverter, and 2 couplers are bridged by one connecting line; and the PLC signal is bridged across the inverter, so that the smoothness of a communication line is realized.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (3)
1. A micro-grid monitoring system based on power line carrier communication is characterized in that,
the monitoring system is used for monitoring a micro-grid system connected to a power distribution network;
the micro-grid system comprises a distributed power module, an energy storage module and a load module;
the distributed power module, the energy storage module and the load module are connected with the power distribution network by using power lines provided with circuit breakers and overload protectors;
a static switch is arranged on the power line between the power distribution network and the micro-grid;
the monitoring system comprises a micro-grid control unit, a sub-control module and a grid-connected point monitoring unit which are communicated with each other through a power line carrier;
the sub-control module comprises a distributed power supply monitoring unit, an energy storage monitoring unit and a micro-grid load monitoring unit;
the distributed power supply monitoring unit is used for monitoring the operation conditions of a wind power generation module and a photovoltaic power generation module in the distributed power supply module in real time and uploading the monitored operation data to the microgrid control unit;
the energy storage monitoring unit is used for monitoring the operation condition of the energy storage module in real time and uploading the monitored charging and discharging data to the micro-grid control unit;
the microgrid load monitoring unit is used for monitoring the operation condition of the load module in real time and uploading the monitored operation data to the microgrid control unit;
communication equipment in the distributed power supply monitoring unit, the energy storage monitoring unit and the microgrid load monitoring unit are respectively connected with one end of each PLC carrier slave machine through respective Ethernet interfaces, and the other end of each PLC carrier slave machine couples a communication signal to the power line of a unit accessory to which the PLC carrier slave machine belongs through a coupler;
the communication equipment in the micro-grid master control unit is connected with one end of a PLC (programmable logic controller) carrier host through an Ethernet interface, and the other end of the PLC carrier host couples a communication signal to a power line through a coupler; the communication equipment in the grid-connected point monitoring unit is connected with one end of 1 PLC carrier slave machine by an Ethernet interface of the communication equipment, and the other end of each PLC carrier slave machine couples communication signals to the power line through a coupler;
the communication equipment in the micro-grid master control unit and the monitoring unit of the grid-connected point are respectively connected to the EPON optical fiber network by 1 optical network unit in the EPON optical fiber network; each optical network unit which is remained in the EPON optical fiber network is connected with one end of 1 PLC carrier host through an Ethernet interface; the other end of each PLC carrier host couples a communication signal to the power line through a coupler;
the PLC carrier host and the PLC carrier host adopt a high-speed broadband PLC communication technology, the communication speed is 10-500 Mbit/s, and the communication distance is 0.5-1.5 kilometers;
when the analog signal sampling point in the distributed power supply monitoring unit communicates with the distributed power supply monitoring unit, a narrow-band PLC communication technology is adopted between the analog signal sampling point and the distributed power supply monitoring unit, the communication speed is about 100 k-1 Mbit/s, and the communication distance is 1-8 kilometers; the analog signal sampling point comprises a photovoltaic array and a combiner box;
when an inverter is connected between the distributed power supply module and the microgrid control unit, 1 coupler is arranged on each of two sides of the inverter, and 2 couplers are bridged by one connecting line.
2. The system of claim 1, wherein the grid-connected point monitoring unit uploads the measured operation data and frequency data of the power distribution network to the microgrid control unit.
3. The system of claim 1, wherein the operational data includes voltage, current, active power, and reactive power values; the charging and discharging data comprise voltage, current, power and residual electric quantity values of charging and discharging of the energy storage module.
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| CN107404338A (en) * | 2017-07-31 | 2017-11-28 | 清华四川能源互联网研究院 | A kind of energy storage communication system based on power carrier |
| CN108667066A (en) * | 2017-10-20 | 2018-10-16 | 天津瑞能电气有限公司 | A kind of intelligent micro-grid grid entry point monitoring device |
| CN108957378B (en) * | 2018-07-24 | 2021-01-08 | 阳光电源股份有限公司 | Test platform for testing energy management system |
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Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Applicant after: GLOBAL ENERGY INTERCONNECTION Research Institute Applicant after: STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant after: SHAOXING POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant after: State Grid Corporation of China Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city) Applicant before: STATE GRID SMART GRID Research Institute Applicant before: STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant before: SHAOXING POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant before: State Grid Corporation of China |
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Effective date of registration: 20170731 Address after: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Applicant after: GLOBAL ENERGY INTERCONNECTION Research Institute Applicant after: STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant after: SHAOXING POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant after: STATE GRID HEBEI ELECTRIC POWER Co. Applicant after: State Grid Corporation of China Address before: 102209 Beijing City, Changping District science and Technology Park in the future smart grid research institute hospital Applicant before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Applicant before: STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant before: SHAOXING POWER SUPPLY COMPANY OF STATE GRID ZHEJIANG ELECTRIC POWER Co. Applicant before: State Grid Corporation of China |
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