CN114079289A - Regional distribution network multi-technology loss reduction energy-saving system - Google Patents
Regional distribution network multi-technology loss reduction energy-saving system Download PDFInfo
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J13/00001—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 the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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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
- H02J13/00022—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
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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
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1892—Arrangements for adjusting, eliminating or compensating reactive power in networks the arrangements being an integral part of the load, e.g. a motor, or of its control circuit
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation 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
- 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
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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
- 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
- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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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
- Y04S40/126—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
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a regional power grid multi-technology energy-saving loss-reducing system, which comprises domains of different levels from bottom to top: the system comprises a distribution and transformation domain, a line domain, a station domain and a region, wherein each domain is provided with a voltage monitoring point and a reactive monitoring point, a corresponding voltage reactive optimization compensation device is configured aiming at real-time load and reactive conditions, and voltage reactive compensation equipment automatically regulates and controls voltage and reactive according to real-time monitoring data so as to ensure minimum reactive flow and minimum loss in the domain. The multi-technology loss reduction energy-saving power distribution network has the advantages that reactive compensation is carried out where the reactive power is needed, the reactive power is prevented from being supplied from the power supply side, the reactive power balance at all places and in all times is realized, the voltage is qualified and stable, the concept of the power distribution network area network is considered comprehensively from point to surface, and the multi-technology loss reduction energy saving of the area power distribution network is implemented.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a voltage reactive power adjusting device and a control system for each grade of voltage of a power distribution network.
Background
The power distribution network mainly comprises a power transmission line and a transformer, generally refers to a voltage class below 110kV, and the power consumption intensive area is expanded to below 220 kV. And the voltage layers of each stage are coupled by a transformer to transfer electric energy. The windings of each stage of the transformer are matched with the voltage of each stage. The load change in the existing power distribution network has the following characteristics that the load change is gradually increased from top to bottom. Because the distribution network is directly connected with users, the transmission lines are various and different in length, the load change is large, and the like, the voltage loss of the voltage on the transmission lines and the voltage loss on the transformer are changed along with the change of the load, so that different voltage deviations at each part of the distribution network are caused, and the voltage deviation changes along with the change of time. High voltage often appears in areas with good foundation of the power distribution network, and low voltage often appears in areas with poor foundation. High to 260V, low to 160V are common phenomena. Meanwhile, reactive power is everywhere in the alternating current circuit, capacitive reactive power is small in a power distribution network line and is irrelevant to the current size, and the capacitive reactive power can be ignored when load current exists. Therefore, inductive reactive power is the main reactive power generated by the power distribution network, and if no compensation measures are taken, large electric energy loss is caused.
The voltage quality and the reactive power are main factors influencing the electric energy loss of the power distribution network, main transformers in transformer stations in the active power distribution network are all provided with an on-load voltage regulation function, but distribution transformers which directly supply power to users with large load changes are not provided with the on-load voltage regulation function, so that the power supply voltage is high and low in time and has large deviation, meanwhile, a low-voltage reactive compensation device arranged in the transformer can only compensate low-voltage lines, the reactive power of the distribution transformers cannot be compensated, the reactive power flows, and the loss is large; the reactive compensation devices are also arranged in the transformer substation and the circuit, but most of the devices are compensated by one or two groups of capacitors, so that the reactive compensation effect of most transformer substations which operate at present is poor due to the fact that the capacitors are over-compensated when being put into use and under-compensated when not being put into use, a large amount of reactive power comes from a power supply end, certain electric energy loss can be caused due to reactive current flowing, and meanwhile, the transmission capacity and the voltage quality of a power grid are reduced and poor.
Disclosure of Invention
The invention provides a multi-technology energy-saving loss-reducing system for a regional power grid, which adopts where reactive power is needed to perform reactive power compensation and avoids reactive power from being supplied from a power supply side. The reactive power balance at any place and in real time is realized, and the voltage is qualified and stable. From point to surface, consider from the concept overall plan of distribution network area network, implement: 'regional distribution network multi-technology loss reduction and energy conservation'.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the utility model provides a regional many technologies of distribution network reduce and lose economizer system which characterized in that, includes the domain of different levels, includes from the bottom to the top: distribution and transformation domain, line domain, station domain and area;
one line domain comprises a plurality of distribution transformer power supply areas, namely the distribution domains;
one station domain comprises a plurality of 10kV line power supply regions, namely the line domains;
one said area comprises a plurality of transformer station power supply areas, namely said station areas;
each domain entrance is provided with an electric energy quality monitoring point, each domain selects a point to install a voltage reactive power optimization compensation device according to the voltage grade and the load change of the domain, and each voltage reactive power optimization compensation device is provided with an electric energy quality monitoring point;
the power supply areas of all levels of the area, the station area, the line area and the distribution and transformation area are provided with the voltage reactive power optimization compensation devices of different voltage grades from the distribution and transformation area at the lowest layer, and the voltage reactive power optimization compensation devices are arranged at the positions where reactive power unbalance occurs, so that voltage reactive power balance is carried out upwards step by step;
the voltage reactive power optimization compensation devices in the domains can independently analyze and calculate according to the acquired voltage and current parameters to automatically adjust the voltage gears and adjust the reactive power;
the voltage reactive power optimization compensation device and the power quality monitoring point in the lower layer domain can upload the equipment state and parameters of the voltage reactive power optimization compensation device and the power quality monitoring point to a control system in the upper layer domain through a communication network, and the control system in the upper layer domain can regulate and control equipment in the lower layer domain according to the uploaded data.
According to a preferred embodiment of the invention, the distribution transformer in the distribution transformer domain realizes voltage reactive comprehensive control, namely distribution transformer VQC, the 10kV incoming line is taken as a monitoring point, the measured reactive power is compensated by a common compensation capacitor in the distribution transformer VQC, and the reactive power generated by the distribution transformer is compensated; reactive power measured by a 400V monitoring point on the low-voltage side of the distribution transformer is compensated by a split-phase compensation capacitor in the distribution transformer VQC, and three phases of different reactive power generated by a low-voltage line are compensated.
According to a preferred embodiment of the invention, the distribution transformer domain further comprises a 400V line automatic compensation device and a 400V local compensation device which are set according to the reactive power demand condition of the electric equipment, so that the reactive power on the 400V power supply line tends to be balanced and the reactive power of the electric equipment tends to be balanced.
According to a preferred embodiment of the present invention, the line domain includes a plurality of the distribution domains, the entrance of the line domain is provided with the power quality monitoring points for monitoring power quality and reactive power conditions, the line domain further includes a 10kV line reactive power compensation device and a 10kV line voltage reactive power comprehensive adjustment device, i.e., a 10kV line VQC, the point selection is performed according to the actual load and reactive power conditions of the 10kV line to install a plurality of the 10kV line reactive power compensation devices, the point selection is performed when the 10kV line is longer to install the 10kV line VQC, and the 10kV line reactive power compensation devices and the 10kV line VQC are both provided with power quality monitoring points.
According to a preferred embodiment of the present invention, the station domain includes a plurality of the line domains, the power quality monitoring points are disposed at the entrance of the station domain and on the low voltage side of the main transformer in the station domain for monitoring the power quality and the reactive power condition, the station domain further includes a 10kV compact fine reactive power compensation device, the 10kV compact fine reactive power compensation device with corresponding capacity and corresponding number of capacitor sets is configured according to the actual load and reactive power demand condition in the station domain, and the reactive power compensation of the station domain does not need to flow in from the entrance.
According to a preferred embodiment of the invention, the 10kV compact fine reactive power compensation device configures the number and capacity of capacitor banks according to the station load change and the reactive demand condition, the capacitors can be finely divided into 10 banks, and the capacitors are automatically switched according to the actual operation condition, so that the reactive power tends to be balanced.
According to a preferred embodiment of the present invention, the area comprises a plurality of the station areas, the power quality monitoring points are arranged at the entrance of the area and on the low-voltage side of the main transformer in the area for monitoring the power quality and the reactive power condition, the area further comprises a 35kV compact fine reactive power compensation device, the 35kV compact fine reactive power compensation device with corresponding capacity and corresponding number of capacitor sets is configured according to the actual load and reactive power demand condition in the area, and the reactive power compensation for the area does not need to flow in from the entrance.
According to a preferred embodiment of the invention, the 35kV compact fine reactive power compensation device performs configuration of the number and capacity of the capacitor groups according to the regional load change and the reactive demand condition, the capacitors can be finely divided into 10 groups, and the switching of the capacitors is automatically performed according to the actual operation condition, so that the reactive power tends to be balanced.
According to a preferred embodiment of the present invention, a line domain control center is disposed in the line domain, a station domain control center is disposed in the station domain, and a region control center is disposed in the region; the line domain control center is connected with the electric energy quality monitoring point and the voltage reactive power optimization compensation device in the distribution and transformation domain through a communication network, the electric energy quality monitoring point and the voltage reactive power optimization compensation device in the line domain are connected with the line domain control center, and the line domain control center can receive the electric parameter information of the electric energy quality monitoring point and the voltage reactive power optimization compensation device in the distribution and transformation domain and the line domain, analyze and calculate the electric parameter information and send a regulation and control instruction to the electric energy quality monitoring point and the voltage reactive power optimization compensation device according to the calculation result;
the substation area control center is connected with the line area control center, the electric energy quality monitoring points and the voltage reactive power optimization compensation device in the substation area through a communication network, and can receive electric parameter information of the line area control center, the electric energy quality monitoring points and the voltage reactive power optimization compensation device in the substation area for analysis and calculation and send a regulation and control instruction to the line area control center according to a calculation result;
the regional control center is connected with the station domain control center, the electric energy quality monitoring points in the region and the voltage reactive power optimization compensation device through a communication network, and can receive the electric parameter information of the station domain control center, the electric energy quality monitoring points in the region and the voltage reactive power optimization compensation device, analyze and calculate the electric parameter information, and send a regulation and control instruction to the electric energy quality monitoring points and the voltage reactive power optimization compensation device according to a calculation result.
Compared with the prior art, the method has the advantages that the power distribution network is divided into domains of different levels according to voltage grades, voltage and reactive monitoring points are arranged on each domain, corresponding voltage reactive compensation equipment is configured according to real-time load and reactive conditions, and the voltage reactive compensation equipment automatically regulates and controls voltage and reactive according to real-time monitoring data so as to ensure minimum reactive flow and minimum loss in the domains; meanwhile, the problems of excessive reactive input and insufficient reactive input existing in operation equipment are solved by selecting refined compensation equipment, comprehensive regulation and control of voltage reactive are realized due to the distribution transformer, the problem that the distribution transformer in active service operation does not have reactive compensation is also solved, reactive flow in a network is minimum by configuring a regional multi-technology loss reduction energy-saving system, the transmission capacity of a power distribution network is improved, the qualification of power supply voltage is improved, and the power distribution network operates in an optimal state.
Drawings
FIG. 1 is a hierarchical domain division of a multi-technology loss reduction energy-saving system of an area power distribution network aiming at different grades of voltages of the power distribution network;
FIG. 2 is a schematic diagram of a reactive power optimization structure of a distribution transformer domain in the multi-technology loss-reducing energy-saving system of the regional distribution network according to the present invention;
FIG. 3 is a schematic diagram of a reactive power optimization structure of a line domain in the regional distribution network multi-technology loss reduction energy-saving system according to the present invention;
FIG. 4 is a schematic diagram of a reactive power optimization structure of a station domain in the multi-technology loss-reducing energy-saving system of the regional distribution network according to the present invention;
FIG. 5 is a schematic diagram of a voltage reactive power comprehensive adjusting device (distribution transformer VQC) of a distribution transformer in the multi-technology loss reduction energy-saving system of the regional distribution network according to the present invention;
FIG. 6 is a schematic diagram of the principle of a 10kV or 35kV compact fine reactive power compensation device in the multi-technology loss-reducing energy-saving system of the regional distribution network;
fig. 7 is a schematic diagram of communication structures of various domains of the multi-technology loss-reducing energy-saving system for the regional power distribution network.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The embodiments described below are merely intended to more clearly illustrate the technical solutions of the present invention, are selected embodiments of the present invention, not all embodiments, and thus the scope of the present invention is not limited thereto. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of protection of the present invention.
Referring to fig. 1, the multi-technology loss-reduction energy-saving system for the regional power distribution network is divided into four domains according to voltage classes, which are sequentially from bottom to top: and (3) a distribution domain: a power supply area of a distribution transformer, line area: power supply area, station area of a 10kV line: a 35kV/110kV transformer substation power supply area, area: a 220kV transformer substation power supply area; the line domain comprises a plurality of distribution domains, the station domain comprises a plurality of line domains, and the area comprises a plurality of station domains.
Referring to fig. 2 to 4, the principle of the equipment structure of each domain in the multi-technology loss-reducing energy-saving system of the regional power distribution network is shown, the system architecture mainly has the function of realizing voltage stabilization and reactive power balance in each domain to reduce the loss of equipment and lines in each domain, the basic principle is that from the distribution and transformation domain at the lowest layer, a voltage reactive power optimization compensation device is configured at the position where reactive power imbalance occurs according to the voltage grade and the actual operation condition, the voltage reactive power optimization compensation device automatically performs voltage adjustment and reactive power compensation according to the actual operation load change and the reactive power demand, real-time guarantees reactive power balance and voltage stabilization, and performs voltage reactive power balance step by step upwards.
In fig. 2 to 4, each domain includes an electric energy quality monitoring point, that is, the monitoring point and the voltage reactive power optimization compensation device in fig. 2 to 4, the monitoring point may be an independent electric energy quality monitoring terminal, or may be integrated with the voltage reactive power optimization compensation device, that is, each voltage reactive power optimization compensation device is provided with a monitoring point, the monitoring point may acquire related electrical parameters such as voltage and current in real time, the voltage reactive power optimization compensation device in each domain may independently analyze and calculate according to the acquired voltage and current parameters, automatically adjust voltage gears and reactive power, or upload data through a wireless or wired communication network.
Referring to fig. 2, the structure and schematic diagram of the equipment in the distribution and transformation domain are shown, the voltage reactive power optimization compensation device in the distribution and transformation domain includes a distribution transformer voltage reactive power comprehensive adjustment device, namely, a distribution transformer VQC, a 400V line automatic compensation device, a 400V local compensation device, and further includes an electric energy quality detection point, namely, a 400V compensation terminal device in fig. 2, which is set according to the reactive power demand condition of the electric equipment, so that the reactive power on the distribution transformer and the 400V power supply line tends to balance and the reactive power balance of the electric equipment; for example, as shown in fig. 2, a 400V local compensation device is randomly installed beside the motor, and can be interlocked with the start and stop of the motor, and when the load change of the motor is large, the compensation can be carried out by tracking the load change, so that the reactive power of the motor is balanced in real time; one or a plurality of 400V line automatic compensation devices are installed at selected points on a 400V line and used for compensating reactive power requirements of scattered electric equipment, such as: the reactive demand of household appliances of urban or rural residents; the low-voltage side of the distribution transformer is provided with a 400V compensation terminal device with a communication function, the device and the distribution transformer are matched to have a voltage reactive comprehensive control function, reactive balance at an inlet of a distribution transformer domain is guaranteed, an on-load voltage regulation tap joint of the distribution transformer can be adjusted to enable 400V voltage to be output stably, and the device not only guarantees reactive balance at the inlet of the distribution transformer domain, but also has certain reactive spare capacity; referring to fig. 5, a schematic diagram of a voltage reactive power integrated control (VQC) is shown by taking a distribution transformer VQC as an example, wherein 10kV incoming lines are taken as monitoring points, and the measured reactive power is compensated by a common compensation capacitor in the distribution transformer VQC to compensate the reactive power generated by a distribution transformer; the low-voltage side 400V of the distribution transformer is used as a monitoring point, the measured reactive power is compensated by a split-phase compensation capacitor in the distribution transformer VQC, the different reactive power of three phases generated by a low-voltage line is compensated, the reactive voltage balance of the distribution transformer and the low-voltage line is ensured, and the reactive loss and the line loss of the distribution transformer are greatly reduced.
Referring to fig. 3, the schematic diagram of the structure and the principle of the equipment in the line domain is shown, the voltage reactive power optimization compensation device in the line domain comprises a 10kV line reactive power compensation device and a 10kV line voltage reactive power comprehensive adjustment device, namely, a 10kV line VQC, a plurality of 10kV line reactive power compensation devices are installed at selected points according to the actual load and the reactive power condition of the 10kV line, a 10kV line VQC is installed at selected points when the 10kV line is longer, the 10kV line reactive power compensation device and the 10kV line VQC have the power quality monitoring function, and each access point of the 10kV line reactive power compensation device and the 10kV line VQC is a reactive power compensation node and a power quality monitoring point so that the monitoring points form a reactive power optimization area downwards. A plurality of (usually 1 to 3) 10kV line reactive power compensation devices and 10kV line VQC are installed at selected points, a plurality of electric energy quality monitoring points are arranged on the 10kV line, namely a plurality of layers of reactive power optimization areas are formed, and a line domain voltage reactive power optimization system performs local domain voltage reactive power optimization by taking each monitoring point as a voltage reactive power balance target point to enable voltage reactive power to be balanced layer by layer from bottom to top.
Referring to FIG. 4, which is a schematic diagram of an equipment structure and a principle of a station domain, a voltage reactive power optimization compensation device in the station domain is mainly a 10kV compact fine reactive compensation device having a power quality monitoring function, power quality monitoring points are arranged at an entrance of the station domain and on a low-voltage side of a main transformer in the station domain for monitoring power quality and reactive power conditions, the 10kV compact fine reactive compensation device with corresponding capacity and corresponding capacitor group number is configured according to actual load and reactive power demand conditions in the station domain, reactive power of the compensation station domain does not need to flow from the entrance, the 10kV compact fine reactive compensation device can configure capacitor capacity according to actual load change conditions, and can divide capacitors into up to 10 groups for real-time load change tracking and reactive power compensation, so that the problem that only one or two groups of capacitors in a power station in active service operation cannot meet actual demand under-supply or over-supply is solved, the energy-saving and loss-reducing effects are obvious.
The region comprises a plurality of station domains, the structure and the principle of the device of the region are similar to the station domains, the voltage reactive power optimization compensation device in the region is mainly a 35kV compact fine reactive power compensation device, electric energy quality monitoring points are arranged at the entrance of the region and on the low-voltage side of a main transformer in the region and are used for monitoring the electric energy quality and the reactive power condition, the 35kV compact fine reactive power compensation device with corresponding capacity and the number of corresponding capacitor groups is configured according to the actual load and reactive power demand condition in the region, the reactive power of the compensation region does not need to flow in from the entrance, the 35kV compact fine reactive power compensation device can configure the capacity of the capacitor according to the actual load change condition, meanwhile, the capacitor can be divided into up to 10 groups, and the reactive power compensation can be carried out by tracking the load change in real time, thereby solving the problem that only one group or two groups of capacitors in the transformer station in active service operation can not meet the actual demand under-supply or over supply, the energy-saving and loss-reducing effects are obvious.
Referring to fig. 6, the principle of the compact reactive compensation device is shown by taking a 10kV compact fine reactive compensation device as an example, and the principle that the capacitors of the compact reactive compensation device are divided into 5 groups can be seen from the figure, and the high-voltage switch is connected by adopting a connection type bus mode, so that the occupied area is greatly saved, the original reactive compensation device can be directly transformed or replaced into the 10kV or 35kV compact fine reactive compensation device on the occupied area position, the actual operation requirement is met, the occupied area space does not need to be increased, and the economic benefit is obvious.
Referring to fig. 7, a schematic diagram of a communication structure of each domain of a multi-technology loss-reducing energy-saving system for a regional power distribution network according to the present invention is shown, where a set of "multi-technology loss-reducing energy-saving control center for a regional power distribution network" (abbreviated as a regional control center, also called a master station) is installed in a region, a station domain control center is installed in a station domain, a line domain control center is installed in a line domain, and a station domain control center is a subsystem of the regional control center and can be operated independently and automatically or controlled by the regional control center, and a line domain control center is a subsystem of the station domain control center and can be operated independently and automatically or controlled by the station domain control center.
The regional control center (main station) performs network communication with the station domain control centers (sub-stations) in a wired or wireless communication mode, stores, analyzes and calculates data information of all the station domains, sends instructions to all the station domain control centers (sub-stations) according to calculation results, and simultaneously displays and stores various data information to form a regional distribution network multi-technology loss reduction and energy saving system.
The 400V line automatic compensation device and the 400V local compensation device are directly controllable compensation terminal devices of a line domain control center and are controllable compensation terminal devices at the tail end of a multi-technology loss reduction energy-saving system of a regional power distribution network. The system comprises a 400V line automatic compensation device, a 400V local compensation device, a distribution transformer VQC, a 10kV line reactive compensation device and a 10kV line voltage reactive comprehensive adjustment device, which can independently and automatically operate and can be controlled by a line domain control center. The system can receive and act commands downloaded by a line domain control center, and simultaneously upload various electrical data to the line domain control center, and the line domain control center analyzes and calculates the electrical data and downloads the commands or uploads data information to a substation domain control center (substation) according to a calculation result.
The system comprises a line domain control center and a 10kV compact fine reactive power compensation device, which can independently and automatically operate and can be controlled by a substation domain control center (substation). The system can receive the command downloaded by the substation area control center (substation), then download or act, and simultaneously upload various electrical data to the substation area control center (substation), and the substation area control center (substation) stores, analyzes and calculates the electrical data, and downloads the command or uploads data information to the area control center (main station) according to the calculation result.
The station domain control center and the 35kV compact fine reactive power compensation device can independently and automatically operate, can also be controlled by a regional control center (main station), can receive or download instructions of the regional control center (main station), and simultaneously upload various electrical data to the regional control center (main station), and the regional control center (main station) stores, analyzes and calculates data information of all station domains and sends instructions to each station domain voltage reactive power optimization system according to calculation results.
Referring to fig. 1 to 6, it can be known that, in each level of power supply areas of an area, a station area, a line area and a distribution and transformation area, starting from a bottom distribution and transformation area, a voltage reactive power optimization compensation device automatically operates, and performs local compensation in a layered and partitioned manner, so as to avoid reactive power supply from a power supply side, realize reactive power balance at all places and in real time, and ensure qualified and stable voltage, meanwhile, the voltage reactive power optimization compensation device can operate independently and can also be controlled by a control center of each area, the whole system is connected through a communication network, so that real-time data acquisition, storage, monitoring, analysis, control and the like can be realized, the whole system and equipment realize four remote functions, aiming at the problems of voltage and reactive power existing in active operation equipment and a power distribution network and the serious loss problem further caused by the problems, all nodes needing reactive power automatic compensation devices are installed in a multi-technology loss reduction and energy-saving system of a regional power distribution network, and the reactive power automatic compensation devices are installed at a low-voltage side of a transformer (including a transformer), the intelligent power distribution network has the functions of voltage reactive comprehensive automatic control VQC, automatic voltage regulation is carried out by the tap joint of the automatic regulating transformer while reactive automatic compensation is carried out, voltage reactive balance is enabled to start from 400V electric equipment, 400V circuits and the low-voltage 400V side of the distribution transformer, reactive voltage balance is carried out step by step upwards, reactive power flowing in a power grid is avoided, meanwhile, the power transmission capacity of a distribution network is also improved by adjusting voltage, loss is greatly reduced, the running state of the equipment in the distribution network area can be enabled to be optimal, the loss is reduced to the minimum through voltage reactive coordination regulation and control and monitoring of the whole area network, and economic running of the distribution network is achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, changes and modifications can be made without departing from the technical principle and structure of the present invention, and these changes and modifications should also be considered as the protection scope of the present invention.
Claims (9)
1. The utility model provides a regional many technologies of distribution network reduce and lose economizer system which characterized in that, includes the domain of different levels, includes from the bottom to the top: distribution and transformation domain, line domain, station domain and area;
one line domain comprises a plurality of distribution transformer power supply areas, namely the distribution domains;
one station domain comprises a plurality of 10kV line power supply regions, namely the line domains;
one said area comprises a plurality of transformer station power supply areas, namely said station areas;
each domain entrance is provided with an electric energy quality monitoring point, each domain selects a point to install a voltage reactive power optimization compensation device according to the voltage grade and the load change of the domain, and each voltage reactive power optimization compensation device is provided with an electric energy quality monitoring point;
the power supply areas of all levels of the area, the station area, the line area and the distribution and transformation area are provided with the voltage reactive power optimization compensation devices of different voltage grades from the distribution and transformation area at the lowest layer, and the voltage reactive power optimization compensation devices are arranged at the positions where reactive power unbalance occurs, so that voltage reactive power balance is carried out upwards step by step;
the voltage reactive power optimization compensation devices in the domains can independently analyze and calculate according to the acquired voltage and current parameters to automatically adjust the voltage gears and adjust the reactive power;
the voltage reactive power optimization compensation device and the power quality monitoring point in the lower layer domain can upload the equipment state and parameters of the voltage reactive power optimization compensation device and the power quality monitoring point to a control system in the upper layer domain through a communication network, and the control system in the upper layer domain can regulate and control equipment in the lower layer domain according to the uploaded data.
2. The multi-technology loss-reducing and energy-saving system for the regional distribution network according to claim 1, wherein a distribution transformer in the distribution transformer domain realizes voltage reactive power comprehensive control, namely distribution transformer VQC, with 10kV incoming lines as monitoring points, and the measured reactive power is compensated by a common compensation capacitor in the distribution transformer VQC to compensate the reactive power generated by the distribution transformer; reactive power measured by a 400V monitoring point on the low-voltage side of the distribution transformer is compensated by a split-phase compensation capacitor in the distribution transformer VQC, and three phases of different reactive power generated by a low-voltage line are compensated.
3. The multi-technology loss-reducing and energy-saving system for the regional distribution network of claim 1, wherein the distribution transformer domain further comprises a 400V line automatic compensation device and a 400V local compensation device, which are set according to the reactive demand condition of the electric equipment, so that the reactive on the 400V power supply line tends to be balanced and the reactive of the electric equipment tends to be balanced.
4. The multi-technology loss-reducing and energy-saving system for the regional power distribution network according to claim 1, wherein the line domain comprises a plurality of distribution domains, the entrance of the line domain is provided with power quality monitoring points for monitoring power quality and reactive conditions, the line domain further comprises 10kV line reactive compensation devices and 10kV line voltage reactive comprehensive adjusting devices, namely 10kV line VQC, the reactive comprehensive adjusting devices are selected according to actual loads and reactive conditions of the 10kV lines and are installed on the 10kV line reactive compensation devices, the 10kV lines are selected to be installed on the 10kV lines VQC when the 10kV lines are long, and the 10kV line reactive compensation devices and the 10kV line VQC are all provided with power quality monitoring points.
5. The system according to claim 1, wherein the station area comprises a plurality of said line areas, said power quality monitoring points are disposed at the entrance of the station area and on the low voltage side of the main transformer in the station area for monitoring the power quality and reactive power condition, and said station area further comprises 10kV compact fine reactive power compensation device, said 10kV compact fine reactive power compensation device with corresponding capacity and corresponding number of capacitor banks is configured according to the actual load and reactive power demand condition in the station area, and the reactive power compensation of the station area does not need to flow from the entrance.
6. The multi-technology loss-reducing and energy-saving system for the regional power distribution network according to claim 5, wherein the 10kV compact fine reactive power compensation device configures the number and capacity of capacitor groups according to the load change and reactive demand conditions of the station area, the capacitors can be finely divided into 10 groups, and the capacitors are automatically switched according to actual operation conditions, so that reactive power tends to be balanced.
7. The system of claim 1, wherein the area comprises a plurality of said stations, said power quality monitoring points are disposed at the entrance of the area and on the low voltage side of the main transformer in the area for monitoring the power quality and reactive power condition, and said area further comprises 35kV compact fine reactive power compensation device, said 35kV compact fine reactive power compensation device with corresponding capacity and corresponding number of capacitor sets is configured according to the actual load and reactive power demand condition in the area, and the reactive power of the area is compensated and does not need to flow in from the entrance.
8. The multi-technology loss-reducing and energy-saving system for the regional power distribution network according to claim 7, wherein the 35kV compact fine reactive power compensation device performs configuration of the number and capacity of capacitor groups according to regional load change and reactive demand conditions, the capacitors can be finely divided into 10 groups, and the capacitors are automatically switched according to actual operation conditions, so that reactive power tends to be balanced.
9. The system of claim 1, wherein a line area control center is disposed in the line area, a station area control center is disposed in the station area, and a regional control center is disposed in the region; the line domain control center is connected with the electric energy quality monitoring point and the voltage reactive power optimization compensation device in the distribution and transformation domain through a communication network, the electric energy quality monitoring point and the voltage reactive power optimization compensation device in the line domain are connected with the line domain control center, and the line domain control center can receive the electric parameter information of the electric energy quality monitoring point and the voltage reactive power optimization compensation device in the distribution and transformation domain and the line domain, analyze and calculate the electric parameter information and send a regulation and control instruction to the electric energy quality monitoring point and the voltage reactive power optimization compensation device according to the calculation result;
the substation area control center is connected with the line area control center, the electric energy quality monitoring points and the voltage reactive power optimization compensation device in the substation area through a communication network, and can receive electric parameter information of the line area control center, the electric energy quality monitoring points and the voltage reactive power optimization compensation device in the substation area for analysis and calculation and send a regulation and control instruction to the line area control center according to a calculation result;
the regional control center is connected with the station domain control center, the electric energy quality monitoring points in the region and the voltage reactive power optimization compensation device through a communication network, and can receive the electric parameter information of the station domain control center, the electric energy quality monitoring points in the region and the voltage reactive power optimization compensation device, analyze and calculate the electric parameter information, and send a regulation and control instruction to the electric energy quality monitoring points and the voltage reactive power optimization compensation device according to a calculation result.
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