CN103633653A - Intelligent series-parallel reactive power compensation component-based power grid distributed-control system and implementation method for same - Google Patents
Intelligent series-parallel reactive power compensation component-based power grid distributed-control system and implementation method for same Download PDFInfo
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- CN103633653A CN103633653A CN201310538802.3A CN201310538802A CN103633653A CN 103633653 A CN103633653 A CN 103633653A CN 201310538802 A CN201310538802 A CN 201310538802A CN 103633653 A CN103633653 A CN 103633653A
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses an intelligent series-parallel reactive power compensation component-based power grid distributed-control system and an implementation method for the same. The system consists of one or more intelligent components and an upper computer, wherein each intelligent component can be independently used, and is provided with a three-phase current and voltage sampling circuit for a three-phase power system, a power controller, and a plurality of switches and reactive power compensation devices, which are controlled by the power controller. The system and the method are characterized in that the power controllers are used for controlling each switch in three-phase reactive power compensation units of the power system to realize series compensation as well as parallel compensation according to sampling results respectively. The distributed-control system is high in reliability. According to the system and the method, voltage of a power grid can be boosted, the stability of the power grid can be improved, reactive power can be compensated, and meanwhile, the unbalance of active power can be regulated.
Description
Technical field
The present invention relates to the reactive power compensation field of electric power system.Be particularly related to the meritorious uneven field of electrical network three-phase and the power automation field adjusted.
Background technology
Prior art adopts reactive power compensation intelligent apparatus generally can only carry out series compensation or shunt compensation, and China Patent No. is that application number is 01241526.X, and name is called " reactive-load compensation circuit device of high voltage network ", and it can only compensating reactive power, but cannot balance meritorious.Though having series-parallel compensation arrangement, China Patent No. is now 200410009536.6, name be called " integrated controller of eactive compensation and power quality " although can prevent voltage subside can not balance meritorious and complex circuit, cost is high.And be centralized compensation, poor reliability.
Summary of the invention
The object of the invention is can adjust meritorious method and intelligent assembly by compensating reactive power again by compensation network loss of voltage raising stability for providing a kind of in electric power system simultaneously.These assemblies can independently be used, and also can form reactive power compensation Distributed Control System.These assemblies can also can carry out segmentation dispersion compensation to the electrical network of same voltage gradation to the electrical network of different electric pressures, by communication-cooperation, control centralized management, and energy-saving effect is remarkable, and compensation redundant ability strengthens, and reliability improves.
The present invention is achieved by the following technical solutions: which comprises at least the intelligent assembly of a series and parallel, each assembly has communication function, and these assemblies can be applied separately also can form distributing system easily.The intelligent assembly of series and parallel detects three-phase current detection circuit, the three-phase voltage sample circuit of electric power system, one or several different compensating devices that have a controller and controlled by controller.Each intelligent assembly can realize series connection or and the function of compensation, conventionally in three-phase imbalance situation, first carry out shunt compensation, at this moment carry out again series compensation during electric power system lower voltage.
the present invention compared with prior art tool has the following advantages:
Controller in intelligent assembly of the present invention is controlled and can, by the control of reactive power compensation device is realized the series compensation of electric power system and shunt compensation, can be realized the three-phase imbalance that improves power system power supply voltage and balance electric power system.Intelligent assembly can be placed on diverse location, applying flexible, and energy-saving effect is remarkable.By coordination, control and make reactive power compensation there is redundancy feature, greatly improved the reliability of reactive compensation system.
Accompanying drawing explanation:
Fig. 1: be the schematic diagram respectively with the idle device compensation of series and parallel connections intelligent assembly
Fig. 2: be to share the schematic diagram that connection in series-parallel shares the compensation intelligent assembly of compensating device
Fig. 3: be to take the block diagram of the collecting and distributing bucking-out system that series and parallel intelligent assembly forms as basis.
embodiment:
Embodiment 1
Fig. 1 is the schematic diagram that the idle device compensation of connection in series-parallel intelligent assembly is set respectively: which comprises at least three-phase current sample circuit, three-phase benefit voltage sampling circuit, a controller, nine switches, six building-out capacitors; Described current sample is to consist of three instrument transformer La, Lb, Lc loading for detection of three-phase current, their one end is connected on respectively AI11, AI12, the AI13 input of power controller, after the other end is connected together, then receive on 0 terminal of power controller.Described voltage sampling circuit is by the primary side of voltage transformer, to be connected on respectively the upper detection loop being connected with AI1, AI2, AI3, AI21, AI22, the AI23 of controller respectively with secondary side of Ua1, Ub1, Uc1, Ua2, Ub2, Uc2 of power supply.Described controller has first-harmonic and the high order harmonic component detectability of voltage and current, and with this, judges system performance by analytic operation, improves the stability of electrical network by control.Be provided with communication interface, so that communicate information is coordinated the work of each assembly simultaneously.The capacity of described building-out capacitor C and the quantity of voltage withstand class and electric capacity are by deciding according to actual needs.Switch J1, J1ab, J1ac, J2, J2ba, J2bc, J3, J3ca, J3cb can be vacuum contactor, combination switch or noncontacting switch.When J1 disconnects, electric capacitor C1s is gone up mutually it is carried out to series compensation at A, the pressure drop causing to offset the inductance of supply line, has played the effect that improves system voltage.When the closed J1ac of J1ab disconnects, electric capacitor C1p, between A phase and B phase, at this moment can be gone up meritorious the transferring to B of A phase mutually; When the closed J1ab of J1ac disconnects, electric capacitor C1p, between A phase and C phase, at this moment can be gone up meritorious the transferring to C of A phase mutually.Played the effect of adjusting meritorious compensating reactive power.When J2 disconnects, electric capacitor C2s is gone up mutually it is carried out to series compensation at B, the pressure drop causing to offset the inductance of supply line, has played the effect that improves system voltage.When the closed J2bc of J2ba disconnects, electric capacitor C2p is added between B phase and A phase, at this moment meritorious the transferring to A of B phase can be gone up mutually; When the closed J2ba of J2bc disconnects, electric capacitor Cp2 is added between B phase and C phase, at this moment meritorious the transferring to C of B phase can be gone up mutually.At this moment can play the effect of adjusting meritorious compensating reactive power.When J3 disconnects, electric capacitor C3s is added in to C go up mutually it is carried out to series compensation, the pressure drop causing to offset the inductance of supply line, has played the effect of raising system voltage.When the closed J3cb of J3ca disconnects, electric capacitor C3p is added between C phase and A phase, at this moment meritorious the transferring to A of C phase can be gone up mutually; When the closed J3ca of J3cb disconnects, electric capacitor C3p is added between C phase and B phase, at this moment meritorious the transferring to B of C phase can be gone up mutually.At this moment can play the effect of adjusting meritorious compensating reactive power.This assembly, carrying out when the different electric pressures of electrical network compensate respectively only having the intelligent compensation assembly of series compensating function on high-tension side diverse location setting, only has the intelligent compensation assembly of shunt compensation function in low-pressure side setting.
Embodiment 2
Fig. 2 is the schematic diagram that connection in series-parallel shares the compensation intelligent assembly of compensating device: it comprises is equipped with voltage sampling circuit, a power controller, 12 switches, three building-out capacitors after the voltage sampling circuit ,San road compensation before the compensation of current sampling circuit ,San road, a master switch ,San road in a housing and shell; Described current sample is to consist of three instrument transformer La, Lb, Lc loading for detection of three-phase current, and their one end is connected on respectively AI11, AI12, the AI13 input of controller, after the other end is connected together, then receives on 0 terminal of power controller.Described voltage sampling circuit, be primary side by voltage transformer respectively with power supply Ua1, Ub1, Uc1, Ua2, the upper detection loop being connected with AI1, AI2, AI3, AI21, AI22, the AI23 of rate controller respectively with secondary side of Ub2, Uc2.Switch J1p, J1s, J1ab, J1ac, J2p, J2s, J2ba, J2bc, J3p, J3s, J3ca, J3cb can be vacuum contactor, combination switch or noncontacting switch.When J1p, J1ab, J1ac disconnect, when J1s is closed, electric capacitor C1 is added in to A and go up mutually it is carried out to series compensation, the pressure drop causing to offset the inductance of supply line, has played the effect of raising system voltage.When J1p, J1ab closed J1s, J1ac disconnect, electric capacitor C1 is added between A phase and B phase, at this moment meritorious the transferring to B of A phase can be gone up mutually; When J1p, J1ac closed J1s, J1ab disconnect, electric capacitor C1 is added between A phase and C phase, at this moment meritorious the transferring to C of A phase can be gone up mutually.Played the effect of adjusting meritorious compensating reactive power.When J2p, J2ba, J2bc disconnect, when J2s remains silent, electric capacitor C2 is added in to B and go up mutually it is carried out to series compensation, the pressure drop causing to offset the inductance of supply line, has played the effect of raising system voltage.When J2p, J2ba closed J2s, J2bc disconnect, electric capacitor C2 is added between B phase and A phase, at this moment meritorious the transferring to A of B phase can be gone up mutually; When J2p, J2bc closed J2s, J2ba disconnect, electric capacitor C2 is added between B phase and C phase, at this moment meritorious the transferring to C of B phase can be gone up mutually.At this moment can play the effect of adjusting meritorious compensating reactive power.When J3p, J3ca, J3cb disconnect, when J3s remains silent, electric capacitor C3 is added in to C and go up mutually it is carried out to series compensation, the pressure drop causing to offset the inductance of supply line, has played the effect of raising system voltage.When J3p, J3ca closed J3s, J3cb disconnect, electric capacitor C3 is added between C phase and A phase, at this moment meritorious the transferring to A of C phase can be gone up mutually; When J3p, J3cb closed J3s, J3ca disconnect, electric capacitor C3 is added between C phase and B phase, at this moment meritorious the transferring to B of C phase can be gone up mutually.At this moment can play the effect of adjusting meritorious compensating reactive power.How carrying out series compensation is according to the electric power system voltage detecting, when this detected value is too low, carry out series compensation, when detect three-phase current unbalance time carry out shunt compensation, compensating device in this example is electric capacity, can be that several electric capacity can be also inductance or carry out applied in any combination with embodiment 2 below during practical application.In fact series and parallel can compensate on the electrical network for different electric pressures.As 10KV or 35KV, series and parallel also can compensate respectively in different electric pressures, and as series compensation compensates on 35KV electrical network, shunt compensation compensates etc. on 10KV electrical network.
Its course of work is such: when sampling three-phase current and three-phase voltage send into after controller, it according to this testing result make control decision.The control signal of controlling output and be the output output by power controller completes to be controlled the switching of each switch.Conventionally when detect three-phase current unbalance time carry out shunt compensation, at this moment compensating device is added between phase and phase, at this moment not only can compensating reactive power, the while can be adjusted meritorious.Compensating device can be that electric capacity can be also inductance, and How to choose switching capacitance or inductance are to determine according to the phase difference of electric current and voltage.This phase difference is that the electric power system electric current that detects according to power controller and instantaneous voltage are by calculating.The electric power system electric current and the instantaneous voltage that when the three-phase voltage detecting is on the low side, according to power controller, detect carry out series compensation by calculating.Series compensation is to offset the loss of voltage that electric power system causes due to reactance.In above-mentioned example, compensating device is electric capacity, and this is because the reactance of most electric power systems is perceptual during practical application, otherwise compensating device adopts inductance.So the present invention in actual applications compensating device can be that electric capacity can be also inductance; Can be a compensating device, can be also a plurality of compensating devices; Compensating device can electric capacity or inductance, can be also its combination.Can adopt example 1 or example 2 can be also its combination.Number and the capacity of series compensation and shunt compensation device are determined by actual needs.The structure of switching circuit can be taked different modes.Series and parallel intelligent assembly can carry out in same electric pressure, as at 10KV, or 35KV.Also can under different brackets, carry out, as series compensation compensates the 110KV in electrical network, 35KV and 10KV, shunt compensation compensates the 10KV of electrical network and 400V; If series compensation is at 35KV, shunt compensation is at 10KV etc.General indemnity principle is first to have the merit of adjustment balance, then series compensation, first low pressure, rear high pressure.The supply line of series compensation can add hand switch, and compensating device two ends also can add switch so that maintenance etc.This assembly also can be reduced to the assembly only with serial or parallel connection compensate function when practical application.The intelligent compensation assembly specific implementation circuit that series and parallel of the present invention only has series compensating function has various ways.For example, series and parallel not only can compensate high-voltage fence simultaneously, also can carry out series and parallel to intermediate and low electric network, also can in high-pressure side, carry out series compensation simultaneously, and low-pressure side is carried out shunt compensation.
Embodiment 3
Fig. 3 be take the block diagram of the collecting and distributing bucking-out system that series and parallel intelligent assembly forms as basis: it comprises the intelligent assembly that different electric pressure electrical networks is carried out to the connection in series-parallel reactive power compensation of reactive power compensation, and the intelligent assembly 11 of connection in series-parallel reactive power compensation in this example carries out the intelligent assembly of the connection in series-parallel reactive power compensation of reactive power compensation to the intelligent assembly 1n of connection in series-parallel reactive power compensation to 110KV electrical network; The intelligent assembly 21 of connection in series-parallel reactive power compensation carries out the intelligent assembly of the connection in series-parallel reactive power compensation of reactive power compensation to the intelligent assembly 2n of connection in series-parallel reactive power compensation to 10KV electrical network; The intelligent assembly 31 of connection in series-parallel reactive power compensation carries out the intelligent assembly of the connection in series-parallel reactive power compensation of reactive power compensation to the intelligent assembly 3n of connection in series-parallel reactive power compensation to 0.4KV electrical network.The intelligent assembly of actual connection in series-parallel reactive power compensation can compensate the electrical network of different electric pressures.As the electrical network of the different electric pressure voltages such as 20KV, 60KV, 220KV carries out reactive power compensation.Between them, can communicate by letter mutually, also can and host computer between communicate.Host computer completes all functions that common host computer can complete.As record, printing, warning etc.During practical application, first carry out imbalance compensation, simultaneously because the radius of electricity supply of 0.4KV electrical network is less, therefore carry out imbalance compensation in this case more, and seldom carry out series compensation.Otherwise the electrical network more than 10KV electric pressure is because radius of electricity supply more all adopts series compensation.
Technical characteristics of the present invention is to adopt passive compensating device, with cheap price and flexibly Configuration the electrical network of different electric pressures is realized to series compensation and shunt compensation, reach and both can improve the voltage of electric power system and stabilization of power grids degree also can the meritorious compensating reactive power object of balance.They have communication and harmonic measurement function, and the coordination ability is strong, and response is fast.Each intelligent assembly can work alone, and also has communication function, can network, and can realize disperseing to compensate and control centralized management, and co-ordination, is improved the reliability of bucking-out system greatly, and energy-saving effect is remarkable.
Claims (10)
1. take connection in series-parallel reactive power compensation intelligent assembly as basic electrical network Distributed Control System and its implementation for one kind, intelligent assembly comprises: the three-phase current of three-phase electrical power system and three-phase voltage sample circuit, controller and by one or more series and parallels unit of its control (consisting of electric capacity or inductance or their equivalent electric circuit and fling-cut switch thereof), it is characterized in that power controller controls respectively each switch in reactive power compensation device according to sampled result, make it both can realize series compensation, also can realize shunt compensation; Can compensation network pressure drop, also can compensating reactive power balance meritorious; Take this assembly as basis, can realize easily the collecting and distributing control of the reactive power compensation of the electrical network of different electric pressures,
2.each intelligent assembly has communication function, can network, and disperses to compensate and controls centralized management, and co-ordination, is improved the reliability of bucking-out system greatly, and energy-saving effect is remarkable.
2. according to the Distributed Control System described in claim 1, it is characterized in that take that intelligent assembly is as basis, its controller, by detecting the three-phase current of electric power system, is controlled the switching of corresponding shunt compensation device, and the three-phase of adjusting electrical network is meritorious uneven.
3. according to the Distributed Control System described in claim 1, it is characterized in that take that intelligent assembly is as basis, its controller, by detecting the three-phase voltage of electric power system, is controlled the switching of corresponding series compensation device, has realized the compensation to pressure drop of grid.
4. according to the Distributed Control System described in claim 1, it is characterized in that take that intelligent assembly is as basis, its controller can be controlled respectively the switch of the same reactive power compensation device in idle benefit unit according to sampled result, makes it both can realize series compensation, also can realize shunt compensation.
5. according to the Distributed Control System described in claim 1, it is characterized in that each intelligent assembly can control respectively the switch of the different reactive power compensation device in idle benefit assembly according to sampled result, make it partial-compensation device wherein for realizing series compensation, another part compensating device is used for realizing shunt compensation, series and parallel can be carried out in the same electric pressure of electrical network, also can under different electric pressures, compensate respectively.
6. according to the intelligent assembly described in claim 1, it is characterized in that power controller controls respectively the compensating device in idle benefit assembly according to the electric current of sampling and voltage and harmonic wave result thereof, to improve the stability of electric power system.
7. according to the intelligent assembly described in claim 1, it is characterized in that the compensating device that the present invention announces, can be electric capacity or inductance or their equivalent electric circuit.
8. according to the intelligent assembly described in claim 1, it is characterized in that all switches can be contact switches, also noncontacting switch or combination switch, they are all controlled by power controller.
9. according to the intelligent assembly described in claim 1, it is characterized in that power controller can control different idle equivalent electric circuits, the compensating device of connection in series-parallel equivalent compensation circuit can be respectively one or more.
10. according to the intelligent assembly described in claim 1, it is characterized in that thering is communication interface, can be connected with power carrier communication device and be connected with SMS module with ethernet interface module or Modem interface module or GPRS interface module, the coordination ability between each assembly is strong, response is fast, and bucking-out system reliability is high.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104167747A (en) * | 2014-09-11 | 2014-11-26 | 国家电网公司 | Unbalance and reactive compensation control device for low-voltage power grid |
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