CN111654037A - 10kV power distribution network global reactive power and voltage optimization system based on distributed series and parallel compensation and intelligent control thereof - Google Patents
10kV power distribution network global reactive power and voltage optimization system based on distributed series and parallel compensation and intelligent control thereof Download PDFInfo
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- CN111654037A CN111654037A CN202010454540.2A CN202010454540A CN111654037A CN 111654037 A CN111654037 A CN 111654037A CN 202010454540 A CN202010454540 A CN 202010454540A CN 111654037 A CN111654037 A CN 111654037A
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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
- 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
- H02J3/12—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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
Abstract
The invention relates to a 10kV power distribution network global reactive power and voltage optimization system based on distributed series compensation, parallel compensation and intelligent control, which comprises a plurality of parallel capacitor intelligent compensation devices, a plurality of series capacitor intelligent compensation devices and an intelligent optimization control system main station, wherein the parallel capacitor intelligent compensation devices, the series capacitor intelligent compensation devices and the intelligent optimization control system main station are dispersedly installed in the same 10kV power distribution network; parallelly connected there is shunt capacitor intelligent compensation device on the 10kV distribution lines, shunt capacitor intelligent compensation device includes three-phase capacitor group, switching contactor, voltage transformer, current transformer and intelligent control ware on the spot, and it has series capacitor intelligent compensation device to establish ties on the 10kV distribution lines, and series capacitor intelligent compensation device includes three-phase capacitor group, protection bypass device, voltage transformer, current transformer and intelligent control ware on the spot. The invention has the beneficial effects that: the invention can realize the global voltage and reactive power optimization of a 10kV power distribution network.
Description
Technical Field
The invention belongs to the field of optimization control of power distribution networks, and particularly relates to a 10kV power distribution network global reactive power and voltage optimization system based on distributed series and parallel compensation and intelligent control thereof.
Background
The voltage quality of a 10kV distribution network is an important index for judging whether the power supply quality meets the standard, and the quality of the voltage quality is directly related to the safe and economic operation of electric equipment and the normal operation of production. The 10kV distribution network in China has wide coverage area and long total length, most of the 10kV lines in the country have small line diameters, the lines are long (particularly mountain village lines), the number of distribution transformers is large, even more lines are provided with a plurality of large-capacity motors or industrial loads which change rapidly, and low voltage at the tail ends of the lines, serious voltage drop and large line loss are often caused. The voltage quality of a 10kV power distribution network is improved, and the line loss of the power distribution network is reduced. The capacitor reactive power compensation technology is the most economic and effective technical means for solving the problem. At present, most of capacitor reactive power compensation of 10kV power distribution networks in China is intensively and parallelly installed on a 10kV bus of a transformer substation. Although these capacitors have a loss reducing effect on the loss of the main transformer and the loss of the transmission line of the previous stage, they basically do not have an effect on the loss of the 10kV distribution network, and the voltage regulating effect on the entire 10kV distribution network is not very ideal.
In recent years, the power grid enterprises in China have deeper knowledge on the defects of the transformer substation 10kV bus centralized parallel reactive compensation mode. Parallel and series compensation capacitors are therefore also increasingly distributed in 10kV distribution networks. The patent (intelligent distribution network series compensation device, patent number: ZL 201320751287.2) provides a capacitor series compensation technology of a 10kV distribution line; the utility model discloses a 10kV distribution lines capacitor series, parallel hybrid compensation technique (10kV distribution lines series, parallel hybrid capacitance compensation device, application number: 201620090776.1 application date: 2016-01-29). The following problems still remain: 1) most of the configured parallel compensation capacitors are not configured with an on-site intelligent controller, or the on-site controller is configured but cannot control the compensation capacity in real time according to the load change of the power distribution network; 2) a central control system is not provided for coordinating all the compensation devices so as to achieve the aim of reactive power and voltage global optimization; 3) the control of the compensation devices at different installation sites is not coordinated, and the phenomenon of 'racking' (oscillation) occurs.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a 10kV power distribution network global reactive power and voltage optimization system based on distributed series and parallel compensation and intelligent control thereof, and can improve the voltage quality of a 10kV power distribution network, improve the voltage qualification rate, reduce the line loss and increase the power supply quantity.
The 10kV power distribution network global reactive power and voltage optimization system based on distributed series compensation, parallel compensation and intelligent control comprises a plurality of parallel capacitor intelligent compensation devices, a plurality of series capacitor intelligent compensation devices and an intelligent optimization control system main station, wherein the parallel capacitor intelligent compensation devices, the series capacitor intelligent compensation devices and the intelligent optimization control system main station are dispersedly installed in the same 10kV power distribution network; the intelligent compensation device comprises at least one three-phase capacitor bank, at least one switching contactor, two voltage transformers, two current transformers and an on-site intelligent controller, wherein the three-phase capacitor bank is connected with the switching contactor in series; the intelligent compensation device of the series capacitor is connected in series on the 10kV distribution line and comprises a three-phase capacitor bank, a protection bypass device, three voltage transformers, two current transformers and an on-site intelligent controller, wherein the three-phase capacitor bank is connected with the current transformers in series, the three-phase capacitor bank, the voltage transformers and the protection bypass device are connected in parallel, and the on-site intelligent controller is respectively connected with the protection bypass device, the voltage transformers and the current transformers; the intelligent optimization control system main station comprises a main control CPU plug board, a communication module plug board, a storage module plug board and a power supply plug board; the intelligent optimization control system main station exchanges information with all the parallel capacitor intelligent compensation devices and the series capacitor intelligent compensation devices through a GPRS or a special power grid communication network; the intelligent optimization control system master station also interacts information with an SCADA system in the transformer substation through Ethernet; information is interacted between the intelligent compensation devices of the series capacitors and the intelligent local controllers of the intelligent compensation devices of the parallel capacitors which are arranged on the same-circuit 10kV distribution line through a GPRS or a special communication network of a power grid to form a local network; when the intelligent optimization control master station system crashes, the local intelligent controllers in the intelligent compensation devices of the same-circuit 10kV distribution line (in a local network) can still realize distributed coordination control so as to realize local optimization (suboptimal) control of the same-circuit 10kV distribution line.
Preferably, the method comprises the following steps: the local intelligent controller of the intelligent compensation device for the parallel capacitor consists of an embedded microcontroller, an analog signal preprocessing module, a digital signal isolation module, a communication module and a power module; the intelligent controller samples local voltage and current signals, monitors the state of a compensation device (such as the total switching times of a contactor, the capacitance value of a capacitor and the like), sends the state of the device and the local voltage and current signals to a main station of an intelligent optimization control system, receives a control command of the main station of the intelligent optimization control system to carry out on/off control on the switching contactor, and directly carries out on-site emergency control on the device by crossing the control command of the main station under emergency conditions (such as the serious out-of-limit compensation point voltage).
Preferably, the method comprises the following steps: the local intelligent controller of the intelligent compensation device for the series capacitor consists of an embedded microcontroller, an analog signal preprocessing module, a digital signal isolation module, a communication module and a power supply module; the intelligent controller samples the local voltage and current signals, monitors the state of the compensation device (such as the capacitance value of a capacitor and the like), sends the device state and the local voltage and current signals to a main station of the intelligent optimization control system, receives a control instruction of the main station of the intelligent optimization control system, and directly carries out local emergency protection and control on the device by passing the control instruction of the main station under emergency conditions (such as the voltage of a compensation point is seriously out of limit); the protection bypass device is composed of a quick alternating current contactor, or each phase of the protection bypass device is composed of two high-voltage large-current thyristors which are connected in anti-parallel.
Preferably, the method comprises the following steps: the intelligent optimization control system main station comprises three modules:
1) the optimization operation module has the function of performing optimization operation of voltage, reactive power and loss according to the structural parameters of the 10kV power distribution network, real-time operation variables (voltage, active power, reactive power and the like) of the power distribution network and the state of the intelligent compensation device;
2) the communication module has the function of issuing a control instruction to each intelligent compensation device according to the operation result of the optimization operation module and interacting information with the SCADA system in the transformer substation;
3) and the display module has the function of displaying the state of the 10kV power distribution network and the running state of each intelligent compensation device in real time.
The invention has the beneficial effects that:
1) the invention can realize the global voltage and reactive power optimization of a 10kV power distribution network.
2) When the intelligent optimization control master station system is shut down or the communication network is interrupted, all the local intelligent compensation devices installed on the same-loop 10kV distribution line can still realize distributed coordination control to realize local optimization (suboptimal) control.
3) In emergency situations (such as the compensation point voltage is seriously out of limit), the local intelligent controller can override the control command of the main station to carry out local emergency control and protection on the device.
4) The method can estimate the theoretical line loss of the 10kV power distribution network in real time; the system and the device are stable and reliable.
Drawings
FIG. 1 is a schematic diagram of a 10kV power distribution network global reactive power and voltage optimization system based on distributed series and parallel compensation and intelligent control thereof;
FIG. 2 is a schematic diagram of a parallel capacitor intelligent compensation device;
FIG. 3 is a schematic diagram of a series capacitor intelligent compensation device;
FIG. 4 is a schematic diagram of an in-situ intelligent controller structure in the series-parallel capacitor intelligent compensation device.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The 10kV distribution network global reactive power and voltage optimization system based on distributed series-parallel compensation and intelligent control takes a 10kV distribution network formed by all 10kV outgoing lines of the same 220/10kV or 110/10kV transformer substation as a system and each 10kV return distribution line as a subsystem, so that the voltage distribution of the 10kV distribution network can be improved, the voltage is regulated to a qualified level, the transmission capacity and the power consumption of the distribution network are improved, the line loss of the distribution network is reduced, and the system has the characteristics of certain load self-adaption voltage regulation, global voltage, reactive power, loss optimization and the like. The method can realize global (the whole 10kV power distribution network) optimization control and local (each circuit of 10kV distribution lines) optimization control.
As shown in fig. 1, a plurality of parallel capacitor intelligent compensation devices and a plurality of series capacitor intelligent compensation devices are dispersedly installed in a 10kV distribution network powered by the same 110kV or 220kV substation, and an intelligent optimization control system master station is configured in the 110/10kV or 220/10kV substation. The installation positions and the rated capacities of the parallel capacitor intelligent compensation device and the series capacitor intelligent compensation device in the 10kV power distribution network are determined according to the structural parameters and daily load parameters of the 10kV power distribution network in an optimized mode.
The intelligent optimization control system main station exchanges information with each parallel capacitor intelligent compensation device and each series capacitor intelligent compensation device through a GPRS or a special communication network of a power system, and simultaneously exchanges information with an SCADA system in a transformer substation. Performing voltage, reactive power and loss optimization operation according to the structural parameters of the 10kV power distribution network, real-time operation variables (voltage, active power, reactive power and the like) of the power distribution network and the real-time state of the intelligent compensation device; and the operation result is sent to each intelligent compensation device to issue a control instruction.
All the intelligent compensation devices of the series capacitors and the intelligent compensation devices of the parallel capacitors which are arranged on the same-circuit 10kV distribution line can exchange information through a GPRS or a special communication network of a power system to form a local network, and when an intelligent optimization control master station system crashes, local intelligent controllers of the intelligent compensation devices in the local network can still realize distributed coordination control to realize local optimization (suboptimal) control.
As shown in fig. 2, the parallel capacitor intelligent compensation apparatus includes: the intelligent switching system comprises at least one three-phase capacitor bank, a switching contactor corresponding to the three-phase capacitor bank, two voltage transformers, two current transformers and an on-site intelligent controller. The on-site intelligent controller samples on-site voltage and current signals, monitors the state of the compensation device (such as the total switching times of the contactor, the capacitance value of a capacitor and the like), sends the device state and on-site voltage and current signals to a main station of the intelligent optimization control system, and receives a control instruction of the main station of the intelligent optimization control system to perform on-off control on the switching contactor; and under the emergency condition (such as serious voltage out-of-limit), the device can be directly subjected to on-site emergency control by passing through the control instruction of the main station of the intelligent optimization control system.
As shown in fig. 3, the series capacitor intelligent compensation apparatus includes: the intelligent controller comprises a three-phase capacitor bank, a protection bypass device, three voltage transformers, two current transformers and an on-site intelligent controller. The local intelligent controller samples local voltage and current signals and calculates the capacitance value of the capacitor in real time according to the signals (if the capacitance value changes due to the damage of the capacitor, the controller outputs an alarm or protection signal according to the change amplitude); sending device state and local voltage and current signals to a master station of the intelligent optimization control system; and receiving a control instruction of the intelligent optimization control system master station, and under an emergency condition (such as serious voltage out-of-limit), directly carrying out on-site emergency protection and control on the device by passing through the control instruction of the intelligent optimization control system master station. The protection bypass device is composed of a quick alternating current contactor or each phase of the protection bypass device is composed of two high-voltage high-current thyristors which are connected in anti-parallel.
As shown in fig. 4, the intelligent controller in the series-parallel capacitor compensation apparatus includes: the device comprises an embedded microcontroller, an analog signal preprocessing module, a digital signal isolation module, a communication module and a power supply module. The analog signal preprocessing module preprocesses the acquired analog signals such as voltage, current and the like, and then performs analog/digital signal conversion by the A/D in the embedded microcontroller. The digital signal isolation module isolates digital input and output signals of the embedded microcontroller. The embedded microcontroller realizes the communication with the intelligent optimization control system master station through the communication module. The power module provides direct current to the embedded microcontroller.
Claims (3)
1. The utility model provides a 10kV distribution network global reactive power and voltage optimizing system based on distributed cluster, parallel compensation and intelligent control, its characterized in that: the intelligent optimization control system comprises a plurality of parallel capacitor intelligent compensation devices, a plurality of series capacitor intelligent compensation devices and an intelligent optimization control system main station, wherein the parallel capacitor intelligent compensation devices, the series capacitor intelligent compensation devices and the intelligent optimization control system main station are dispersedly installed in the same 10kV power distribution network; the intelligent compensation device of the parallel capacitor is connected in parallel on the 10kV distribution line and comprises a three-phase capacitor bank, a switching contactor, a voltage transformer, a current transformer and an on-site intelligent controller, wherein the three-phase capacitor bank is connected with the switching contactor in series, the three-phase capacitor bank, the voltage transformer and the current transformer are connected in parallel, and the on-site intelligent controller is respectively connected with the switching contactor, the voltage transformer and the current transformer; the intelligent compensation device of the series capacitor is connected in series on the 10kV distribution line and comprises a three-phase capacitor bank, a protection bypass device, a voltage transformer, a current transformer and an on-site intelligent controller, wherein the three-phase capacitor bank is connected with the current transformer in series, the three-phase capacitor bank, the voltage transformer and the protection bypass device are connected in parallel, and the on-site intelligent controller is respectively connected with the protection bypass device, the voltage transformer and the current transformer; the intelligent optimization control system main station comprises a main control CPU plug board, a communication module plug board, a storage module plug board and a power supply plug board; the intelligent optimization control system main station exchanges information with all the parallel capacitor intelligent compensation devices and the series capacitor intelligent compensation devices through a GPRS or a special power grid communication network; the intelligent optimization control system master station also interacts information with an SCADA system in the transformer substation through Ethernet; and information is interacted between the intelligent compensation devices of the series capacitors and the intelligent local controllers of the intelligent compensation devices of the parallel capacitors which are arranged on the same-circuit 10kV distribution line through a GPRS or a special communication network of a power grid.
2. The 10kV power distribution network global reactive power and voltage optimization system based on the distributed series and parallel compensation and the intelligent control thereof according to claim 1, wherein: the intelligent compensation device for the parallel capacitor and the intelligent compensation device for the series capacitor are composed of an on-site intelligent controller, an embedded microcontroller, an analog signal preprocessing module, a digital signal isolation module, a communication module and a power module.
3. The 10kV power distribution network global reactive power and voltage optimization system based on the distributed series and parallel compensation and the intelligent control thereof according to claim 1, wherein: the intelligent optimization control system main station comprises three modules: the optimization operation module is used for performing optimization operation of voltage, reactive power and loss according to the structural parameters of the 10kV power distribution network, the real-time operation variables of the power distribution network and the state of the intelligent compensation device; the communication module is used for issuing a control instruction to each intelligent compensation device according to the operation result of the optimization operation module and interacting information with the SCADA system in the transformer substation; and the display module displays the state of the 10kV power distribution network and the running state of each intelligent compensation device in real time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113708381A (en) * | 2021-07-13 | 2021-11-26 | 国网浙江省电力有限公司衢州供电公司 | Distributed reactive compensation control system for improving network loss |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113708381A (en) * | 2021-07-13 | 2021-11-26 | 国网浙江省电力有限公司衢州供电公司 | Distributed reactive compensation control system for improving network loss |
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