CN108599379B - Power monitoring system for micro-grid group - Google Patents
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- CN108599379B CN108599379B CN201810558738.8A CN201810558738A CN108599379B CN 108599379 B CN108599379 B CN 108599379B CN 201810558738 A CN201810558738 A CN 201810558738A CN 108599379 B CN108599379 B CN 108599379B
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- H02J13/0075—
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- 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
- H02J13/00019—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 optical means
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- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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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
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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
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- 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
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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
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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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
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- 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
Abstract
The embodiment of the invention discloses a power monitoring system for a microgrid group, wherein a monitoring object is the microgrid group, the power monitoring system can monitor the power of a plurality of microgrids in the microgrid group through a monitoring main station and a plurality of local monitoring substations, the monitoring main station can perform information interaction with an external system, receive an active power regulation and control strategy and a voltage/reactive power regulation and control strategy and issue the regulation and control strategy to a specific local monitoring substation corresponding to the microgrid, and the local monitoring substation controls corresponding equipment in the microgrid, so that the requirements of basic functions of energy management, coordination control, protection, communication and the like of the microgrid and the microgrid group are met.
Description
Technical Field
The invention relates to the technical field of micro-grid group monitoring, in particular to a power monitoring system for a micro-grid group.
Background
Energy is the basis for human survival and development, traditional primary energy sources such as coal, petroleum and the like are not renewable, and the method is a necessary choice for solving the contradiction between energy shortage, energy utilization, environmental protection and energy demand increase in the economic development process of each country, improving the energy utilization efficiency, developing new energy and enhancing the utilization of renewable energy.
The micro-grid is used as an autonomous system capable of realizing self control and management, so that the power supply reliability of a user is improved, and the output of intermittent and distributed renewable energy power generation can be effectively consumed.
The micro-grid group has wide application prospect, can be used in a land power supply system, can also be used in an island or a group island power supply system far away from the continents, can comprehensively utilize new energy such as solar energy, wind energy and the like, effectively improves the power supply reliability of a user side while protecting the ecological environment, solves the power supply problem of remote mountain areas and islands, and is beneficial to improving the optimization regulation and control and disaster recovery capability of the intelligent power distribution network. When two or more micro-grids appear in a specific area, the micro-grids establish electrical, control, information and other relations for a common target, and a formed community system, namely a micro-grid community, is short. In the development process of the microgrid, a microgrid group with a certain scale is formed.
Most of the existing technologies related to microgrid monitoring look at a single microgrid, and the monitored object is the output of a distributed power supply in the microgrid and aims to make a power supply strategy. With the development of the microgrid group, monitoring the operation of the microgrid by using a local monitoring mode for a single microgrid or monitoring the output of a distributed power supply is not enough to meet the requirements of basic functions of energy management, coordination control, protection, communication and the like of the microgrid and the microgrid group, so that a power monitoring system for the microgrid group is needed.
Disclosure of Invention
The invention provides a power monitoring system for a micro-grid group, which meets the requirements of basic functions of energy management, coordination control, protection, communication and the like of a micro-grid and the micro-grid group.
The invention provides a power monitoring system for a microgrid cluster, which comprises:
the system comprises a monitoring main station, a local monitoring substation and a communication system;
the monitoring main station is connected with the on-site monitoring substation through the communication system;
the monitoring master station comprises:
the first data acquisition and processing module is used for acquiring analog quantity signal data and state quantity signal data of a grid-connected point of the micro-grid and analyzing and processing the analog quantity signal data and the state quantity signal data;
the information interaction module is used for carrying out information interaction with an external system and receiving an active power regulation strategy and a voltage/reactive power regulation strategy;
the first active power control module is used for issuing an active power control instruction according to the active power regulation and control strategy received by the information interaction module;
the first voltage/reactive power regulation module is used for issuing a voltage/reactive power regulation instruction according to the voltage/reactive power regulation strategy received by the information interaction module;
the in-situ monitoring substation comprises:
the second data acquisition and processing module is used for acquiring the operation data and the operation state data of the microgrid, and analyzing and processing the operation data and the operation state data;
the second active power control module is used for generating a control instruction for power generation equipment or energy storage equipment in the microgrid according to the active power control instruction issued by the monitoring master station;
the second voltage/reactive power adjusting module is used for generating a control instruction for a distributed power supply, a reactive power compensation device, energy storage equipment or an on-load tap changer with controllable reactive power in the microgrid according to the voltage/reactive power adjusting instruction issued by the monitoring master station;
and the equipment control module is respectively connected with the second active power control module and the second voltage/reactive power regulation module and is used for operating corresponding power generation equipment, energy storage equipment, a reactive power controllable distributed power supply, a reactive power compensation device, energy storage equipment or an on-load tap changer according to a control instruction of the power generation equipment in the microgrid and a control instruction of reactive power controllable equipment in the microgrid.
Optionally, the monitoring master station further includes:
and the first storage module is connected with the first data acquisition and processing module and is used for storing the acquired analog quantity signal data and state quantity signal data of the grid-connected point of the microgrid.
Optionally, the in-situ monitoring substation further comprises:
and the second storage module is connected with the second data acquisition and processing module and is used for storing the acquired running data and running state data of the microgrid.
Optionally, the monitoring master station further includes:
the first operation mode control module is used for issuing a first mode switching instruction to the microgrid and carrying out switching control on the grid-connected/off-grid operation mode of the microgrid;
the in-situ monitoring substation further comprises:
the second operation mode control module is connected with the equipment control module and used for generating a second mode switching instruction of the corresponding reactive power controllable distributed power supply, energy storage equipment or grid-connected interface device in the microgrid according to the first mode switching instruction sent by the monitoring master station;
and the equipment control module is used for operating the corresponding distributed power supply, the energy storage equipment or the grid-connected interface device with controllable reactive power according to the second mode switching finger.
Optionally, the monitoring master station further includes:
and the communication network monitoring module is used for monitoring the operation condition of the communication channel.
Optionally, the monitoring master station further includes:
and the system and network management module is used for displaying the running states, the CPU load rate and the hard disk remaining space information of all the servers, the workstations, the application software and the network of the monitoring master station, and has the functions of authority management and abnormal information alarm.
Optionally, the in-situ monitoring substation further comprises:
and the anti-misoperation locking module is used for providing an anti-misoperation locking function.
Optionally, the in-situ monitoring substation further comprises:
and the start-stop control module is connected with the equipment control module and used for sending start-stop control instructions of equipment in the microgrid to the equipment control module according to a preset sequence and flow so as to realize the functions of grid-connected start, grid-connected shutdown, off-grid start and off-grid shutdown of the microgrid.
Optionally, the in-situ monitoring substation further comprises:
and the power quality detection and analysis module is used for monitoring and recording the power quality information of the grid-connected point of the microgrid and reporting the power quality information of the grid-connected point of the microgrid to the monitoring master station.
Optionally, the local monitoring substation of the microgrid connected to the monitoring master station at a voltage level lower than the preset voltage level is connected with the monitoring master station through wireless communication, the monitoring master station further comprises a security access area for wireless communication connection, and a security isolation device is further arranged between the security access area and other modules of the monitoring master station;
and the local monitoring substation of the micro-grid accessed to the micro-grid not lower than the preset voltage level is in communication connection with the monitoring main station through optical fibers.
According to the technical scheme, the invention has the following advantages:
the invention provides a power monitoring system for a microgrid cluster, which comprises: the system comprises a monitoring main station, a local monitoring substation and a communication system; the monitoring main station is connected with the on-site monitoring substation through the communication system; the monitoring master station comprises: the first data acquisition and processing module is used for acquiring analog quantity signal data and state quantity signal data of a grid-connected point of the micro-grid and analyzing and processing the analog quantity signal data and the state quantity signal data; the information interaction module is used for carrying out information interaction with an external system and receiving an active power regulation strategy and a voltage/reactive power regulation strategy; the first active power control module is used for issuing an active power control instruction according to the active power regulation and control strategy received by the information interaction module; the first voltage/reactive power regulation module is used for issuing a voltage/reactive power regulation instruction according to the voltage/reactive power regulation strategy received by the information interaction module; the in-situ monitoring substation comprises: the second data acquisition and processing module is used for acquiring the operation data and the operation state data of the microgrid, and analyzing and processing the operation data and the operation state data; the second active power control module is used for generating a control instruction for power generation equipment or energy storage equipment in the microgrid according to the active power control instruction issued by the monitoring master station; the second voltage/reactive power adjusting module is used for generating a control instruction for a distributed power supply, a reactive power compensation device, energy storage equipment or an on-load tap changer with controllable reactive power in the microgrid according to the voltage/reactive power adjusting instruction issued by the monitoring master station; and the equipment control module is respectively connected with the second active power control module and the second voltage/reactive power regulation module and is used for operating corresponding power generation equipment, energy storage equipment, a reactive power controllable distributed power supply, a reactive power compensation device, energy storage equipment or an on-load tap changer according to a control instruction of the power generation equipment in the microgrid and a control instruction of reactive power controllable equipment in the microgrid.
The invention provides a power monitoring system of a microgrid group, wherein a monitoring object is the microgrid group, the power monitoring system can monitor the power of a plurality of microgrids in the microgrid group through a monitoring main station and a plurality of local monitoring substations, meanwhile, the monitoring main station can carry out information interaction with an external system, receive an active power regulation strategy and a voltage/reactive power regulation strategy and issue the regulation strategy to the local monitoring substations corresponding to the specific microgrid, and the local monitoring substations control corresponding equipment in the microgrid, so that the requirements of basic functions of energy management, coordination control, protection, communication and the like of the microgrid and the microgrid group are met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a power monitoring system for a microgrid group according to the present invention;
FIG. 2 is a schematic diagram of the command and signal flow of a power monitoring system for a microgrid cluster according to the present invention;
wherein the reference numerals are:
1. a monitoring master station; 2. a local monitoring substation; 3. an external system; 11. a first data acquisition and processing module; 12. an information interaction module; 13. a first active power control module; 14. a first voltage/reactive power regulation module; 15. a first storage module; 16. a first operation mode control module; 17. a communication network monitoring module; 18. a system and a network management module; 21. a second data acquisition and processing module; 22. a second active power control module; 23. a second voltage/reactive power regulation module; 24. a device control module; 25. a second storage module; 26. a second operation mode control module; 27. an anti-misoperation locking module; 28. a start-stop control module; 29. and the power quality detection and analysis module.
Detailed Description
The embodiment of the invention provides a power monitoring system for a micro-grid group, which meets the requirements of basic functions of energy management, coordination control, protection, communication and the like of a micro-grid and the micro-grid group.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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 given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, an embodiment of the present invention provides a power monitoring system for a microgrid group, including:
the system comprises a monitoring main station 1, a local monitoring substation 2 and a communication system;
the monitoring main station 1 is connected with the local monitoring substation 2 through a communication system;
the monitoring master station 1 includes:
the first data acquisition and processing module 11 is used for acquiring analog quantity signal data and state quantity signal data of a grid-connected point of the microgrid, and analyzing and processing the analog quantity signal data and the state quantity signal data;
the information interaction module 12 is used for performing information interaction with the external system 3 and receiving an active power regulation and control strategy and a voltage/reactive power regulation and control strategy;
the first active power control module 13 is configured to issue an active power control instruction according to the active power regulation and control strategy received by the information interaction module 12;
the first voltage/reactive power adjusting module 14 is configured to issue a voltage/reactive power adjusting instruction according to the voltage/reactive power adjusting and controlling strategy received by the information interaction module 12;
the on-site monitoring substation 2 includes:
the second data acquisition and processing module 21 is used for acquiring the operation data and the operation state data of the microgrid, and analyzing and processing the operation data and the operation state data;
the second active power control module 22 is configured to generate a control instruction for the power generation device or the energy storage device in the microgrid according to the active power control instruction issued by the monitoring master station 1;
the second voltage/reactive power adjusting module 23 is configured to generate a control instruction for a distributed power supply, a reactive power compensation device, an energy storage device, or an on-load tap changer, where the reactive power in the microgrid is controllable, according to the voltage/reactive power adjusting instruction issued by the monitoring master station 1;
the device control module 24 is respectively connected with the second active power control module 22 and the second voltage/reactive power regulation module 23, and is used for operating corresponding power generation equipment, energy storage equipment, a reactive power controllable distributed power supply, a reactive power compensation device, energy storage equipment or an on-load tap changer according to a control instruction of the power generation equipment in the microgrid and a control instruction of reactive power controllable equipment in the microgrid;
it should be noted that the monitoring master station 1 may be an independent master station, and may also be embedded as a functional module in the distribution automation master station; the on-site monitoring substation 2 can be an independent system, and the on-site monitoring substation 2 can be integrated into a microgrid central controller and an energy management system;
the first data acquisition and processing module 11 provides data support and control basis for other modules in the monitoring master station 1, and similarly, the second data acquisition and processing module 21 provides data support and control basis for other modules in the on-site monitoring substation 2;
the analog quantity signal data acquired by the first data acquisition and processing module 11 include but are not limited to active power of a grid-connected point of a microgrid, reactive power of a grid-connected point of a microgrid, electric energy quality of the grid-connected point of the microgrid and the like; the state quantity signal data includes but is not limited to microgrid accident tripping signals, protection action signals, abnormal signals and the like. The first data acquisition and processing module 11 performs rationality check and out-of-limit alarm analysis processing on the acquired analog quantity signal data and state quantity signal data;
the operation data of the microgrid acquired by the second data acquisition and processing module 21 includes, but is not limited to, distributed power supply measurement data, energy storage measurement data, load measurement data, reactive compensation equipment measurement data, auxiliary equipment measurement data, electric energy measurement data, meteorological and other data, statistical calculation data and the like; the operation state data comprises, but is not limited to, primary and secondary equipment operation state data, auxiliary equipment operation state data, microgrid prediction data, microgrid planning data and the like. The second data acquisition and processing module 21 performs rationality check and out-of-limit alarm analysis and processing according to the acquired running data and running state data of the microgrid;
the range of equipment objects controlled by the equipment control module 24 includes, but is not limited to, circuit breakers, disconnectors, grounding switches, converters, main transformer taps, distributed power and energy storage systems within the microgrid, reactive compensation equipment, and other important equipment.
The embodiment of the invention provides a power monitoring system of a microgrid group, wherein a monitoring object is the microgrid group, the power monitoring system can monitor the power of a plurality of microgrids in the microgrid group through a monitoring main station and a plurality of local monitoring substations, the monitoring main station can perform information interaction with an external system, receive an active power regulation and control strategy and a voltage/reactive power regulation and control strategy and issue the regulation and control strategy to a specific local monitoring substation corresponding to the microgrid, and the local monitoring substation controls corresponding equipment in the microgrid, so that the requirements of basic functions of energy management, coordination control, protection, communication and the like of the microgrid and the microgrid group are met.
Further, the monitoring master station 1 further includes:
and the first storage module 15 is connected with the first data acquisition and processing module 11 and is used for storing the acquired analog quantity signal data and state quantity signal data of the grid-connected point of the microgrid.
Further, the on-site monitoring substation 2 further includes:
and the second storage module 25 is connected with the second data acquisition and processing module 21 and is used for storing the acquired operation data and operation state data of the microgrid.
Further, the monitoring master station 1 further includes:
the first operation mode control module 16 is configured to issue a first mode switching instruction to the microgrid, and perform switching control of an on-grid/off-grid operation mode of the microgrid;
the in-situ monitoring substation 2 further comprises:
the second operation mode control module 26 is connected to the device control module 24, and is configured to generate a second mode switching instruction for the corresponding reactive power controllable distributed power source, the energy storage device, or the grid-connected interface device in the microgrid according to the first mode switching instruction issued by the monitoring master station 1;
the equipment control module 24 is configured to operate the corresponding reactive power controllable distributed power supply, the energy storage equipment, or the grid-connected interface device according to the second mode switching finger;
further, the monitoring master station 1 further includes:
and the communication network monitoring module 17 is used for monitoring the operation condition of the communication channel.
Further, the monitoring master station 1 further includes:
and the system and network management module 18 is used for displaying the running states, the CPU load rates and the hard disk remaining space information of all the servers, the workstations, the application software and the network of the monitoring master station 1, and has the functions of authority management and abnormal information alarm.
Further, the on-site monitoring substation 2 further includes:
and the anti-misoperation locking module 27 is used for providing an anti-misoperation locking function.
Further, the on-site monitoring substation 2 further includes:
and the start-stop control module 28 is connected with the equipment control module 24 and is used for sending start-stop control instructions for equipment in the microgrid to the equipment control module 24 according to a preset sequence and flow so as to realize the functions of grid-connected start, grid-connected shutdown, off-grid start and off-grid shutdown of the microgrid.
Further, the on-site monitoring substation 2 further includes:
the power quality detection and analysis module 29 is used for monitoring and recording the power quality information of the grid-connected point of the microgrid and reporting the power quality information of the grid-connected point of the microgrid to the monitoring master station 1;
it should be noted that the power quality information includes, but is not limited to, harmonics of a grid-connected point, voltage imbalance, voltage deviation, voltage fluctuation and flicker, dc component, and the like.
Furthermore, the local monitoring substation 2 of the micro-grid connected to the monitoring main station 1 at a voltage level lower than the preset voltage level is connected with the monitoring main station 1 through wireless communication, the monitoring main station 1 further comprises a safety access area for wireless communication connection, and a safety isolation device is arranged between the safety access area and other modules of the monitoring main station 1;
the local monitoring substation 2 of the micro-grid connected to the micro-grid with the voltage level not lower than the preset voltage level is in communication connection with the monitoring main station 1 through optical fibers;
it should be noted that, taking the preset voltage level of 10kV as an example, for a microgrid group having access to a microgrid with two voltage levels of 10kV and 380V, the power monitoring system for the microgrid group described in this application is adopted.
For a microgrid with 10kV voltage level access, the on-site monitoring substation 2 can perform data interaction with on-site equipment, issues a control instruction of the microgrid monitoring main station 1 to the on-site equipment for execution, adopts an optical fiber communication mode between the on-site monitoring substation 2 and the monitoring main station 1, meets the real-time requirements of remote measurement, remote signaling, remote control and remote regulation signals, and adopts a communication protocol based on DL/T634.5101 and DL/T634.5104.
For a microgrid with 380V voltage level access, the local monitoring substation 2 only has the functions of monitoring and recording the running condition, and does not participate in active power and voltage/reactive power adjustment. The communication between the on-site monitoring substation 2 and the monitoring main station 1 is accessed to a specially-established safety access area in a wireless communication mode, and a special transverse one-way safety isolation device for electric power detected and authenticated by a national appointed department is arranged at the joint of the safety access area and other parts in the production control area.
For the grid-connected micro-grid accessed to the 10kV voltage class participating in power adjustment, the active power control selects a control mode of controlling according to a scheduling plan curve, and the reactive power/voltage control selects a control mode of receiving a reactive power control set value issued by an upper management system.
During grid-connected operation, the power monitoring method for the microgrid group comprises the following steps:
step 1: dispatching automation system, electricity consumption information acquisition system and monitoring master station transmitting active power regulation strategy and voltage/reactive power regulation strategy PorderAnd Qorder；
Step 2: the monitoring master station 1 selects and respectively issues corresponding grid-connected micro-grids accessed to controllable n 10kV voltage classes according to an active power regulation strategy and a voltage/reactive power regulation strategy through economic calculationActive power control command Δ P1…△PnRespectively issuing corresponding voltage/reactive power regulation instructions delta Q to the controllable grid-connected micro-grid accessed by m 10kV voltage classes1…△Qm. When the command is positive, the command is increased, and when the command is negative, the command is decreased. Respectively representing the active power and the reactive power of the microgrid group before adjustment as PcurAnd QcurAnd satisfies the following conditions:
and step 3: the microgrid on-site monitoring substation 2 executes an active power control instruction and a voltage/reactive power regulation instruction issued by the monitoring master station 1 through a second active power control module 22 and a second voltage/reactive power regulation module 23;
and 4, step 4: the microgrid on-site monitoring substation 2 controls the output of various power generation equipment in the microgrid and the short-term charging and discharging of an energy storage system through an equipment control module 24 to execute active power control; the local monitoring substation 2 controls the distributed power supply with controllable reactive power, the energy storage inverter, the reactive compensation device, the on-load tap changer and other equipment in the microgrid to perform unified reactive voltage control and management.
The active power adjustment instruction received by the kth micro-grid is made to be delta PkThe reactive power adjustment command is DeltaQkThe active power generated by the output of various power generation devices and the short-term charge and discharge of the energy storage system is respectively expressed as Pgen_1…Pgen_n，Psto_1…Psto_mAnd satisfies the following conditions:
distributed power supply with controllable reactive power, energy storage inverter and reactive power compensationThe reactive power generated by the apparatus, on-load tap changer, etc. is represented as Qgen_1…Qgen_n，Qinv_1…Qinv_m，Qcom_1…Qcom_o，Qtra_1…Qtra_pAnd satisfies the following conditions:
the local monitoring substation 2 ensures that the maximum exchange active power and the maximum active power change rate of the tie line conform to the operation scheme approved by the power grid dispatching organization through the second active power control module 22; the on-site monitoring substation 2 ensures that the voltage and the voltage change rate of the grid-connected point conform to the operation scheme approved by the grid dispatching authority through the second voltage/reactive power regulation module 23.
When the on-site monitoring substation 2 needs to adjust the active power and the reactive power at the same time, the active power adjustment is preferentially ensured; the reactive power regulation is preferably regulated using the reactive power regulation function of the reactive power compensation device.
When the off-grid operation is performed, after the monitoring master station 1 gives an off-grid operation instruction to the microgrid, the microgrid on-site monitoring substation 2 can complete smooth switching between grid connection and off-grid of the microgrid.
When the off-grid operation state is carried out, the local monitoring substations 2 of the micro-grids are mainly relied on, and the micro-grids mainly ensure the internal frequency and voltage stability of the system. The on-site monitoring substation 2 monitors the active output value of the main power supply, and when the active output value exceeds a fixed value, the active power of other power supply equipment in the microgrid is adjusted to ensure that the frequency of the microgrid system runs in a normal range; the local monitoring substation 2 monitors the reactive power output value of the main power supply, and when the reactive power output value exceeds a fixed value, the reactive power of other power supply equipment in the microgrid is adjusted, so that the voltage of the busbar of the microgrid and the operation of each power supply equipment are ensured to be within a normal range. The deviation between the active and reactive output values of the main power supply and the set value is delta PmainAnd Δ QmainThe adjustment value of the active and reactive power outputs of the other power sources is DeltaPrestAnd Δ QrestAnd satisfies the following conditions:
ΔPmain＝ΔPrest
ΔQmain＝ΔQrest；
after the external fault of the microgrid is recovered, the microgrid carries out off-grid operation and is switched to grid-connected operation, an automatic execution mode is selected through the local monitoring substation 2 of the microgrid with a 380V voltage level for grid connection, and the local monitoring substation 2 of the microgrid with a voltage level of 10kV or above for grid connection is connected according to a power grid scheduling instruction.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A power monitoring system for a microgrid cluster, comprising:
the system comprises a monitoring main station, a local monitoring substation and a communication system;
the monitoring main station is connected with the on-site monitoring substation through the communication system;
the monitoring master station comprises:
the first data acquisition and processing module is used for acquiring analog quantity signal data and state quantity signal data of a grid-connected point of the micro-grid and analyzing and processing the analog quantity signal data and the state quantity signal data;
the information interaction module is used for carrying out information interaction with an external system and receiving an active power regulation strategy and a voltage/reactive power regulation strategy;
the first active power control module is used for issuing an active power control instruction according to the active power regulation and control strategy received by the information interaction module; the information interaction module is specifically used for respectively issuing corresponding active power control instructions delta P1 … delta Pn to n grid-connected micro-grids which are not lower than the preset voltage level and are accessed according to the active power adjustment strategy received by the information interaction module;
the first voltage/reactive power regulation module is used for issuing a voltage/reactive power regulation instruction according to the voltage/reactive power regulation strategy received by the information interaction module; the information interaction module is specifically used for respectively issuing corresponding voltage/reactive power adjustment instructions delta Q to m grid-connected micro-grids which are not lower than the preset voltage level and are accessed according to the voltage/reactive power regulation and control strategy received by the information interaction module1…△Qm；
Wherein the active power control command satisfies:
the voltage/reactive power adjusting instruction meets the following requirements:
Pcurfor active power, Q, of the microgrid group before regulationcurThe reactive power of the microgrid group before adjustment; porderFor active power regulation strategy, QorderA voltage/reactive power regulation strategy;
the in-situ monitoring substation comprises:
the second data acquisition and processing module is used for acquiring the operation data and the operation state data of the microgrid, and analyzing and processing the operation data and the operation state data;
the second active power control module is used for generating a control instruction for power generation equipment or energy storage equipment in the microgrid according to the active power control instruction issued by the monitoring master station;
the second voltage/reactive power adjusting module is used for generating a control instruction for a distributed power supply, a reactive power compensation device, energy storage equipment or an on-load tap changer with controllable reactive power in the microgrid according to the voltage/reactive power adjusting instruction issued by the monitoring master station;
the device control module is respectively connected with the second active power control module and the second voltage/reactive power regulation module and is used for operating corresponding power generation equipment, energy storage equipment, a reactive power controllable distributed power supply, a reactive power compensation device, energy storage equipment or an on-load tap changer according to a control instruction of the power generation equipment in the microgrid and a control instruction of reactive power controllable equipment in the microgrid;
the equipment control module is also used for preferentially executing the control instruction of the second active power control module when receiving the control instruction sent by the second active power control module and the second voltage/reactive power regulation module at the same time, and for preferentially controlling the reactive power compensation device to carry out reactive power regulation when executing the control instruction of the second voltage/reactive power regulation module;
the on-site monitoring substation which is connected with the micro-grid with the access lower than the preset voltage level is in wireless communication connection with the monitoring main station, the monitoring main station further comprises a safety access area for wireless communication connection, and a safety isolation device is further arranged between the safety access area and other modules of the monitoring main station;
and the local monitoring substation of the micro-grid accessed to the micro-grid not lower than the preset voltage level is in communication connection with the monitoring main station through optical fibers.
2. The power monitoring system for a microgrid cluster of claim 1, wherein the monitoring master station further comprises:
and the first storage module is connected with the first data acquisition and processing module and is used for storing the acquired analog quantity signal data and state quantity signal data of the grid-connected point of the microgrid.
3. The power monitoring system for a microgrid cluster of claim 1, wherein the on-site monitoring substation further comprises:
and the second storage module is connected with the second data acquisition and processing module and is used for storing the acquired running data and running state data of the microgrid.
4. The power monitoring system for a microgrid cluster of claim 1, wherein the monitoring master station further comprises:
the first operation mode control module is used for issuing a first mode switching instruction to the microgrid and carrying out switching control on the grid-connected/off-grid operation mode of the microgrid;
the in-situ monitoring substation further comprises:
the second operation mode control module is connected with the equipment control module and used for generating a second mode switching instruction of the corresponding reactive power controllable distributed power supply, energy storage equipment or grid-connected interface device in the microgrid according to the first mode switching instruction sent by the monitoring master station;
and the equipment control module is used for operating the corresponding distributed power supply, the energy storage equipment or the grid-connected interface device with controllable reactive power according to the second mode switching finger.
5. The power monitoring system for a microgrid cluster of claim 1, wherein the monitoring master station further comprises:
and the communication network monitoring module is used for monitoring the operation condition of the communication channel.
6. The power monitoring system for a microgrid cluster of claim 1, wherein the monitoring master station further comprises:
and the system and network management module is used for displaying the running states, the CPU load rate and the hard disk remaining space information of all the servers, the workstations, the application software and the network of the monitoring master station, and has the functions of authority management and abnormal information alarm.
7. The power monitoring system for a microgrid cluster of claim 1, wherein the on-site monitoring substation further comprises:
and the anti-misoperation locking module is used for providing an anti-misoperation locking function.
8. The power monitoring system for a microgrid cluster of claim 4, wherein the on-site monitoring substation further comprises:
and the start-stop control module is connected with the equipment control module and used for sending start-stop control instructions of equipment in the microgrid to the equipment control module according to a preset sequence and flow so as to realize the functions of grid-connected start, grid-connected shutdown, off-grid start and off-grid shutdown of the microgrid.
9. The power monitoring system for a microgrid cluster of claim 1, wherein the on-site monitoring substation further comprises:
and the power quality detection and analysis module is used for monitoring and recording the power quality information of the grid-connected point of the microgrid and reporting the power quality information of the grid-connected point of the microgrid to the monitoring master station.
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| CN113328528B (en) * | 2021-06-11 | 2022-12-27 | 中海石油(中国)有限公司 | Offshore oil and gas field power grid control device based on shore power supply and use method |
| CN114142613A (en) * | 2021-12-02 | 2022-03-04 | 上海华立软件系统有限公司 | Intelligent control device for distributed power supply |
| CN114498936B (en) * | 2022-02-11 | 2024-02-23 | 国网江苏省电力有限公司电力科学研究院 | Distributed power supply regulation and control system, method and device |
| CN115173559B (en) * | 2022-07-15 | 2023-10-17 | 国网江苏省电力有限公司 | Intelligent monitoring platform for new energy station |
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