CN104319792A - Voltage reactive power compensation system and method - Google Patents
Voltage reactive power compensation system and method Download PDFInfo
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- CN104319792A CN104319792A CN201410687376.4A CN201410687376A CN104319792A CN 104319792 A CN104319792 A CN 104319792A CN 201410687376 A CN201410687376 A CN 201410687376A CN 104319792 A CN104319792 A CN 104319792A
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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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- 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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Abstract
The invention discloses a voltage reactive power compensation system which comprises a collection device, an analyzing and computing device and a reactive power compensation device, wherein the collection device is connected with a grid node and is used for collecting the reactive power and active power of the grid node; the analyzing and computing device is connected with the collection device and used for analyzing and working out a voltage reactive power compensation solution according to the reactive power and the active power; the reactive power compensation device is connected between the analyzing and computing device and the grid node and used for conducting voltage reactive power compensation on the grid node according to the voltage reactive power compensation solution. The invention further discloses a voltage reactive power compensation method. By means of the voltage reactive power compensation system and method, the voltage reactive power compensation can be achieved on the premise that the voltage within the global scope is qualified, and the electricity demands of people are met.
Description
Technical field
The present invention relates to power transmission technology field, particularly relate to a kind of voltage and reactive power compensation system and method.
Background technology
Along with the fast development of China's rural economy and the speed-raising of new countryside construction, in man of peasant household, electrical equipment kind gets more and more, some of them electrical equipment, comprise fluorescent lamp, carry out work according to electromagnetic induction principle, just need consume reactive power to set up magnetic field, in addition, the powerful device such as asynchronous motor, A.C. welder can be used in township enterprise, also be the electromagnetic induction principle utilized, therefore also want consume reactive power.Therefore, not only to comprise active power in the electrical power transmission system of rural power grids, also will comprise reactive power.But there is negative effect in the transmission of reactive power: the increase of reactive power can cause the loss of voltage of transmission line to increase.Because rural power grids equipment is outmoded, backward in technique, automatization level is low, cause its electric network composition flourishing not as urban distribution network structure, the global optimization of voltage and reactive power can not be realized.When reactive power to some of them grid nodes overcompensation, may there is the phenomenon of brownout in peasant household's terminal, some household electrical appliance normally can not be used, bring great inconvenience to the life of people.
The root that rural power grids " low-voltage " are formed mainly appears at following three positions: the first, is the multiple 35KV transformer stations in units of at county level; The second, be many long distance 10kV distribution lines of subordinate or important 10kV distribution line; 3rd, be important power distribution station 0.4kV low-pressure side.In prior art, the just simple compensation certain a part of grid nodes being carried out to reactive power, this just may cause the instability of some portion voltage.Therefore, how under the prerequisite that the voltage of global scope is qualified, carrying out globalize reactive power compensation, meet the need for electricity of people, is a problem demanding prompt solution.
Summary of the invention
For solving the problem, the invention provides a kind of voltage and reactive power compensation system and method, carrying out globalize reactive power compensation under the qualified prerequisite of the voltage of global scope can be realized, meeting the need for electricity of people.
A kind of voltage and reactive power compensation system provided by the invention, comprising:
The harvester be connected with grid nodes, for gathering reactive power and the active power of described grid nodes;
The analytical calculation device be connected with described harvester, for according to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme;
Be connected to the reactive power compensator between described analytical calculation device and described grid nodes, for according to described voltage and reactive power compensation scheme, voltage and reactive power compensation carried out to described grid nodes.
Preferably, in said system, the connection of described harvester and described grid nodes is: described harvester is connected with described grid nodes, for gathering reactive power and the active power of described grid nodes by RS485 wireline interface.
Preferably, in said system, described harvester is connected with described grid nodes and is:
First harvester is connected with transformer station, for gathering the first reactive power and first active power of transformer station;
Second harvester is connected with medium-voltage line, for gathering the second reactive power and second active power of medium-voltage line;
3rd harvester is connected with power distribution station, for gathering the 3rd reactive power and the 3rd active power of power distribution station.
Preferably, in said system, described analytical calculation device is connected with described harvester and is:
First analytical calculation device is connected with described first harvester, and for according to described first reactive power and described first active power, analysis meter calculates the first voltage and reactive power compensation scheme;
Second analytical calculation device is connected with described second harvester, and for according to described second reactive power and described second active power, analysis meter calculates the second voltage and reactive power compensation scheme;
3rd analytical calculation device is connected with described 3rd harvester, and for according to described 3rd reactive power and described 3rd active power, analysis meter calculates tertiary voltage Scheme of Reactive Power Compensation.
Preferably, in said system, described reactive power compensator is connected between described analytical calculation device and described grid nodes and is:
First reactive power compensator is connected between described first analytical calculation device and described transformer station, for according to described first voltage and reactive power compensation scheme, carries out voltage and reactive power compensation to described transformer station;
Second reactive power compensator is connected between described second analytical calculation device and described medium-voltage line, for according to described second voltage and reactive power compensation scheme, carries out voltage and reactive power compensation to described medium-voltage line;
3rd reactive power compensator is connected between described 3rd analytical calculation device and described power distribution station, for according to described tertiary voltage Scheme of Reactive Power Compensation, carries out voltage and reactive power compensation to described power distribution station.
Preferably, in said system, described analytical calculation device is connected with described harvester and is:
4th analytical calculation device is connected with described first harvester, the second harvester and the 3rd harvester, for according to described first reactive power, described first active power, described second reactive power, described second active power, described 3rd reactive power and described 3rd active power, analysis meter calculates the 4th voltage and reactive power compensation scheme, for compensating transformer station, medium-voltage line and power distribution station.
Preferably, in said system, described reactive power compensator is connected between described analytical calculation device and described grid nodes: described 4th reactive power compensator is connected to described 4th analytical calculation device and described transformer station, between described medium-voltage line and described power distribution station, for according to described 4th voltage and reactive power compensation scheme, voltage and reactive power compensation is carried out to described transformer station, described medium-voltage line and described power distribution station.
The method of a kind of voltage and reactive power compensation provided by the invention, comprising:
Gather reactive power and the active power of grid nodes;
According to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme;
According to described voltage and reactive power compensation scheme, voltage and reactive power compensation is carried out to described grid nodes.
Preferably, in the above-mentioned methods, described according to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme and is: according to described reactive power and described active power, calculates reactive power compensation point, Reactive Compensation Mode and reactive compensation capacity.
Preferably, in the above-mentioned methods, described according to described voltage and reactive power compensation scheme, carrying out voltage and reactive power compensation to described grid nodes is:
According to described voltage and reactive power compensation scheme, carry out voltage and reactive power compensation to transformer station, medium-voltage line and power distribution station are unified or respectively voltage and reactive power compensation is carried out to transformer station, medium-voltage line and power distribution station.
By foregoing description, a kind of voltage and reactive power optimization system provided by the invention comprises: the harvester be connected with grid nodes, for gathering reactive power and the active power of described grid nodes; The analytical calculation device be connected with described harvester, for according to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme; Be connected to the reactive power compensator between described analytical calculation device and described grid nodes, for according to described voltage and reactive power compensation scheme, voltage and reactive power compensation carried out to described grid nodes.This system overcomes carries out the compensation of reactive power to a certain part of nodes and causes the problem of spread of voltage merely in prior art, has obvious beneficial effect.In the present invention, described analytical calculation device is according to described reactive power and active power, calculate voltage and reactive power compensation scheme, reactive power compensator carries out voltage and reactive power compensation to grid nodes, the reactive power compensation under the qualified prerequisite of the voltage of global scope can be realized like this, thus meet the need for electricity of people.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structural representation of the first voltage and reactive power compensation system that Fig. 1 provides for the embodiment of the present application;
The structural representation of the second voltage and reactive power compensation system that Fig. 2 provides for the embodiment of the present application;
The structural representation of the third voltage and reactive power compensation system that Fig. 3 provides for the embodiment of the present application;
The method schematic diagram of a kind of voltage and reactive power compensation that Fig. 4 provides for the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present application provides a kind of voltage and reactive power compensation system, as shown in Figure 1, the structural representation of the first voltage and reactive power compensation system that Fig. 1 provides for the embodiment of the present application, this system comprises: the harvester 102 be connected with grid nodes 101, for gathering reactive power and the active power of described grid nodes 101; The analytical calculation device 103 be connected with described harvester 102, for according to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme; Be connected to the reactive power compensator 104 between described analytical calculation device 103 and described grid nodes 101, for according to described voltage and reactive power compensation scheme, voltage and reactive power compensation carried out to described grid nodes 101.
Wherein, the voltage and reactive power compensation system that provides of the embodiment of the present application for grid nodes 101 preferably can comprise three grades of nodes: the 35KV transformer station in units of at county level; Many the long distance 10kV distribution lines of subordinate or important 10kV distribution line; Important power distribution station 0.4kV low-pressure side.Three grades of nodes as above are considered, draws Scheme of Reactive Power Compensation and carry out reactive power compensation of overall importance accordingly.Described harvester 102 can be preferably collector, and its data gathered comprise reactive power and active power, preferably can also gather the parameters such as power factor.In addition, can also preferably comprise monitoring device and display unit, wherein, described monitoring device can be real-time monitoring grid nodes be in operation produce various data, the described data monitored can show by described display unit, analyze and adjust the foundation of Scheme of Reactive Power Compensation as staff.
Wherein, described analytical calculation device 103 is according to described reactive power and described active power, and analysis meter calculates voltage and reactive power compensation scheme.Described voltage and reactive power compensation scheme can preferably comprise: reactive power compensation point, Reactive Compensation Mode and reactive compensation capacity, namely reactive power compensation point is first determined, determine again to adopt which kind of mode in centralized compensation, grouping compensation or individual node local compensation to carry out reactive power compensation, finally determine respectively how many reactive powers are compensated to each node.
Wherein, described reactive power compensator 104 according to the voltage and reactive power compensation scheme calculated, to need compensate grid nodes 101 compensating power.Described Reactive Compensation Mode can preferably by the inductive type device shunt capacitor in grid nodes, like this, capacitor just can output reactive power for described inductive type device, energy is constantly transmitted between, and cause damage can't to like this transmission of electrical network, achieve reactive power compensation again.It should be noted that, this is only a citation form of voltage and reactive power compensation, and also have other forms, do not repeat them here, in addition, simultaneously the reactive power compensation in the application compensates described three grades of grid nodes, therefore may there is multiple compensating form simultaneously.
In said system, described harvester 102 can connect preferably by RS485 wireline interface, for gathering reactive power and the active power of described grid nodes 101 with the connection of described grid nodes 101.Utilize described RS485 wireline interface to connect, there is the advantage of the fast and long transmission distance of transmission speed, better can adapt to the needs of voltage and reactive power compensation real-time fast.It should be noted that, also multiple communication and the data transfer modes such as local area network (LAN), GPRS are wireless, optical fiber can be utilized, and the system interface such as SCADA or MIS connects described grid nodes 101 and described harvester 102, so just can realize collection grid nodes data as much as possible, thus can ensure to calculate accurate Scheme of Reactive Power Compensation.
The embodiment of the present application additionally provides two kinds of preferred implementations of said system, is described with reference to the accompanying drawings.
The structure of the second voltage and reactive power compensation system that the embodiment of the present application provides as shown in Figure 2, the structural representation of the second voltage and reactive power compensation system that Fig. 2 provides for the embodiment of the present application.Within the system, the first harvester 202 is connected with transformer station 201, for gathering the first reactive power and first active power of transformer station 201; Second harvester 206 is connected with medium-voltage line 205, for gathering the second reactive power and second active power of medium-voltage line 205; 3rd harvester 210 is connected with power distribution station 209, for gathering the 3rd reactive power and the 3rd active power of power distribution station 209.
First analytical calculation device 203 is connected with described first harvester 202, and for according to described first reactive power and described first active power, analysis meter calculates the first voltage and reactive power compensation scheme; Second analytical calculation device 207 is connected with described second harvester 206, and for according to described second reactive power and described second active power, analysis meter calculates the second voltage and reactive power compensation scheme; 3rd analytical calculation device 211 is connected with described 3rd harvester 210, and for according to described 3rd reactive power and described 3rd active power, analysis meter calculates tertiary voltage Scheme of Reactive Power Compensation.
First reactive power compensator 204 is connected between described first analytical calculation device 203 and described transformer station 201, for according to described first voltage and reactive power compensation scheme, carries out voltage and reactive power compensation to described transformer station 201; Second reactive power compensator 208 is connected between described second analytical calculation device 207 and described medium-voltage line 205, for according to described second voltage and reactive power compensation scheme, carries out voltage and reactive power compensation to described medium-voltage line 205; 3rd reactive power compensator 212 is connected between described 3rd analytical calculation device 211 and described power distribution station 209, for according to described tertiary voltage Scheme of Reactive Power Compensation, carries out voltage and reactive power compensation to described power distribution station 209.It should be noted that, in such systems, be still and take as the leading factor with the reactive power compensation strategy of voltage first, when there is deviation in the compensatory control of any first nodes, the principle that described first reactive power compensator 204 will follow in-situ balancing sends correction of deviation instruction, makes three grades of nodes all can keep optimum state.
Utilize voltage and reactive power compensation system as above, achieve the independent calculation compensation scheme of every first nodes and compensate, thus realizing voltage and reactive power compensation of overall importance.
The structure of the third voltage and reactive power compensation system that the embodiment of the present application provides as shown in Figure 3, the structural representation of the third voltage and reactive power compensation system that Fig. 3 provides for the embodiment of the present application.Within the system, the first harvester 302 is connected with transformer station 301, for gathering the first reactive power and first active power of transformer station 301; Second harvester 304 is connected with medium-voltage line 303, for gathering the second reactive power and second active power of medium-voltage line 303; 3rd harvester 306 is connected with power distribution station 305, for gathering the 3rd reactive power and the 3rd active power of power distribution station 305.
4th analytical calculation device 307 is connected with described first harvester 302, second harvester 304 and the 3rd harvester 306, for according to described first reactive power, described first active power, described second reactive power, described second active power, described 3rd reactive power and described 3rd active power, analysis meter calculates the 4th voltage and reactive power compensation scheme, for compensating transformer station 301, medium-voltage line 303 and power distribution station 305 are unified.
4th reactive power compensator 308 is connected to described 4th analytical calculation device 307 and described transformer station 301, between described medium-voltage line 303 and described power distribution station 305, for according to described 4th voltage and reactive power compensation scheme, carry out voltage and reactive power compensation to described transformer station 301, described medium-voltage line 303 and described power distribution station 305 are unified.
Utilize the third voltage and reactive power compensation system as above, the Scheme of Reactive Power Compensation of three grades of whole nodes of electrical network can be calculated by unified analysis meter, thus make the parameters such as the voltage of three grades of grid nodes, reactive power, transmission losses all be in optimum state.
The embodiment of the present application additionally provides a kind of method of voltage and reactive power compensation, as shown in Figure 4, and the method schematic diagram of a kind of voltage and reactive power compensation that Fig. 4 provides for the embodiment of the present application.The method comprises:
Step S1: the reactive power and the active power that gather grid nodes.
In this step, every one-level grid nodes is all provided with corresponding harvester, the operational factor of node is gathered, these parameters comprise reactive power and active power, also the parameters such as power factor can be comprised, these parameters are by the foundation as calculating Scheme of Reactive Power Compensation, and the behavior of this collection is always ongoing, can't stop.
Step S2: according to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme.
In this step, a kind of preferred analytical calculation mode is: according to described reactive power and described active power, calculate reactive power compensation point, Reactive Compensation Mode and reactive compensation capacity.First the whole active power obtained according to collector and the parameter such as reactive power, which determine node to carry out reactive power compensation to, determine again to adopt which kind of mode in centralized compensation, grouping compensation or individual node local compensation to carry out reactive power compensation, finally determine and how many reactive powers are compensated to each node.
Step S3: according to described voltage and reactive power compensation scheme, voltage and reactive power compensation is carried out to described grid nodes.
In this step, according to described voltage and reactive power compensation scheme, voltage and reactive power compensation can be carried out to transformer station, medium-voltage line and power distribution station are unified, or, also can carry out voltage and reactive power compensation respectively to transformer station, medium-voltage line and power distribution station.Above-mentioned two schemes all can ensure that voltage and reactive power reach global optimum.
Utilize method as above, the voltage in global scope and reactive power compensation optimization can be realized, thus meet the need for electricity of people.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a voltage and reactive power compensation system, is characterized in that, comprising:
The harvester be connected with grid nodes, for gathering reactive power and the active power of described grid nodes;
The analytical calculation device be connected with described harvester, for according to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme;
Be connected to the reactive power compensator between described analytical calculation device and described grid nodes, for according to described voltage and reactive power compensation scheme, voltage and reactive power compensation carried out to described grid nodes.
2. system according to claim 1, it is characterized in that, the connection of described harvester and described grid nodes is: described harvester is connected with described grid nodes, for gathering reactive power and the active power of described grid nodes by RS485 wireline interface.
3. system according to claim 1, is characterized in that, described harvester is connected with described grid nodes and is:
First harvester is connected with transformer station, for gathering the first reactive power and first active power of transformer station;
Second harvester is connected with medium-voltage line, for gathering the second reactive power and second active power of medium-voltage line;
3rd harvester is connected with power distribution station, for gathering the 3rd reactive power and the 3rd active power of power distribution station.
4. system according to claim 3, is characterized in that, described analytical calculation device is connected with described harvester and is:
First analytical calculation device is connected with described first harvester, and for according to described first reactive power and described first active power, analysis meter calculates the first voltage and reactive power compensation scheme;
Second analytical calculation device is connected with described second harvester, and for according to described second reactive power and described second active power, analysis meter calculates the second voltage and reactive power compensation scheme;
3rd analytical calculation device is connected with described 3rd harvester, and for according to described 3rd reactive power and described 3rd active power, analysis meter calculates tertiary voltage Scheme of Reactive Power Compensation.
5. system according to claim 4, is characterized in that, described reactive power compensator is connected between described analytical calculation device and described grid nodes and is:
First reactive power compensator is connected between described first analytical calculation device and described transformer station, for according to described first voltage and reactive power compensation scheme, carries out voltage and reactive power compensation to described transformer station;
Second reactive power compensator is connected between described second analytical calculation device and described medium-voltage line, for according to described second voltage and reactive power compensation scheme, carries out voltage and reactive power compensation to described medium-voltage line;
3rd reactive power compensator is connected between described 3rd analytical calculation device and described power distribution station, for according to described tertiary voltage Scheme of Reactive Power Compensation, carries out voltage and reactive power compensation to described power distribution station.
6. system according to claim 3, is characterized in that, described analytical calculation device is connected with described harvester and is:
4th analytical calculation device is connected with described first harvester, the second harvester and the 3rd harvester, for according to described first reactive power, described first active power, described second reactive power, described second active power, described 3rd reactive power and described 3rd active power, analysis meter calculates the 4th voltage and reactive power compensation scheme, for compensating transformer station, medium-voltage line and power distribution station.
7. system according to claim 6, it is characterized in that, described reactive power compensator is connected between described analytical calculation device and described grid nodes: described 4th reactive power compensator is connected to described 4th analytical calculation device and described transformer station, between described medium-voltage line and described power distribution station, for according to described 4th voltage and reactive power compensation scheme, voltage and reactive power compensation is carried out to described transformer station, described medium-voltage line and described power distribution station.
8. a method for voltage and reactive power compensation, is characterized in that, comprising:
Gather reactive power and the active power of grid nodes;
According to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme;
According to described voltage and reactive power compensation scheme, voltage and reactive power compensation is carried out to described grid nodes.
9. method according to claim 8, it is characterized in that, described according to described reactive power and described active power, analysis meter calculates voltage and reactive power compensation scheme and is: according to described reactive power and described active power, calculates reactive power compensation point, Reactive Compensation Mode and reactive compensation capacity.
10. the method according to Claim 8 described in-9 any one, is characterized in that, described according to described voltage and reactive power compensation scheme, and carrying out voltage and reactive power compensation to described grid nodes is:
According to described voltage and reactive power compensation scheme, carry out voltage and reactive power compensation to transformer station, medium-voltage line and power distribution station are unified or respectively voltage and reactive power compensation is carried out to transformer station, medium-voltage line and power distribution station.
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Application publication date: 20150128 |