CN105896560A - Reactive power compensation optimization method - Google Patents
Reactive power compensation optimization method Download PDFInfo
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- CN105896560A CN105896560A CN201610343507.6A CN201610343507A CN105896560A CN 105896560 A CN105896560 A CN 105896560A CN 201610343507 A CN201610343507 A CN 201610343507A CN 105896560 A CN105896560 A CN 105896560A
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- compensation
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- 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
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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 discloses a reactive power compensation optimization method, which comprises the following steps: (1) establishing configuration principles, including two principles, namely a local reactive power balancing principle and a principle of considering available resources of reactive power compensation equipment; (2) by the two principles, firstly carrying out DC power flow calculation according to the established power network connection mode, a power supply and a load to obtain approximation distribution of an active power of a branch; (3) calculating ideal reactive power compensation amount of a node according to the active power of the branch; and (4) finally considering the available resources of reactive power compensation, carrying out transferring and discretization on the ideal compensation amount, achieving local reactive power balancing and forming the reactive power compensation configuration scheme of the whole network. By the reactive power compensation optimization method, a complicated optimization algorithm is not needed; the problems of the calculation scale and the convergence are solved; the method is suitable for generation of an initial power flow mode; reasonable initial reactive power compensation configuration can be obtained; formulation of the reasonable operation mode is facilitated; and automation of mode arrangement is achieved.
Description
Technical field
The present invention relates to reactive power compensation technology field, be specifically related to a kind of reactive power compensation ability method.
Background technology
Current power plant is by many restrictions such as water resource, environmental conservation, and its position is more and more far away from load center, even if building near load point, owing to single-machine capacity is increasing, the rated power factor of electromotor is more and more higher.So, the reactive power of the actual acceptance of electrical network is the most fewer and feweri, depends merely on the reactive power that electromotor sends and can not meet far away the electrical network needs to reactive power, it is necessary to configures various reactive power compensation device.
Large power system is objective requirement and the inexorable trend of electric power industry development.Along with developing rapidly of China's power industry, supergrid gradually forms, and system structure is increasingly sophisticated, when system is by larger interference, it is possible to cause system voltage to collapse in voltage stabilization weak link.Additionally, the most non-linear present in power system, impact disturbance load or other disturbing source, not only affect the safe operation of utility network, also to various power consumers with electric process cause directly with indirectly endanger.Therefore, the most reasonably select compensation point, suitably system is carried out reactive-load compensation, with regard to the problem becoming people's growing interest.
Reasonably select reactive-load compensation point, reasonably take Reactive Compensation Mode and reactive power compensator, it is possible to effectively maintain the voltage levvl of system, the voltage stability of raising system, avoid the most idle long-distance transmissions, thus reduce active power loss, reduce generating expense.
For a long time, reactive-load compensation allocation problem uses the method for idle work optimization to solve mostly.Idle work optimization is in every restriction range, finds a kind of flow state of loss minimization, needs the method by optimizing to solve, and its control variable and network size are limited, and process is complicated, there is convergence problem, are more focused on the adjustment that becomes more meticulous that local is idle.Initial trend in arranging for the method for operation, it is the most reasonable that reactive-load compensation configuration only needs, it is ensured that trend restrains.Formulating initial trend at present still uses conventional Load Flow to calculate, and i.e. after determining the control variable such as load, generating, reactive-load compensation, by solving one group of power flow equation group determined, obtains trend solution.During this, reactive-load compensation configuration needs dependence mode personnel rule of thumb to formulate.Along with the development of electrical network scale, trend convergence problem is more and more prominent, and reactive-load compensation configuration generally requires and manually repeatedly adjusts, inefficiency.
Summary of the invention
For problem above, the invention provides a kind of reactive power compensation ability method, for the mode data arranging grid structure and parameter, generated output and payload properly, calculate DC power flow, according to branch road effective power flow distribution estimation node ideal reactive-load compensation amount, and consider the actual installation situation of shunt capacitance reactor, configure existing device resource, it is achieved idle in-situ balancing.The method is without complicated optimized algorithm, do not calculate scale and convergence problem, it is applicable to the generation of initial trend mode, the most initial reactive-load compensation configuration can be obtained, contribute to formulating the rational method of operation, the automatization that implementation arranges, can effectively solve the problem in background technology.
To achieve these goals, the technical solution used in the present invention is as follows: a kind of reactive power compensation ability method, comprises the steps:
(1) equipping rules is established: including two principles, one is idle in-situ balancing principle, a principle being to consider reactive-load compensation equipment available resources；
(2) according to two principles, first according to it has been determined that power network wiring mode, power supply and load carry out DC power flow calculating, obtain the APPROXIMATE DISTRIBUTION that branch road is meritorious；
(3) then according to branch road gain merit calculate node preferable reactive-load compensation amount；
(4) finally consider reactive-load compensation available resources, ideal compensation amount is shifted and discretization, it is achieved idle in-situ balancing, form the reactive-load compensation allocation plan of the whole network.
According to technique scheme, the Load flow calculation that described method (2) uses and idle work optimization software for calculation are to carry out inductive reactive power compensation optimization calculating, each ingredient of electrical network is modeled by this software, carry out the Load flow calculation of major network, and use catastrophic genetic algorithm to realize optimal reactive power allocation and planning, and optimal reactive power dispatch.
According to technique scheme, pay the utmost attention to the in-situ balancing of each candidate compensation buses, for there being the node of idle compensating for resource, realize, first with reactive power compensator itself, the in-situ balancing that node is idle, it is impossible to in-situ balancing consider further that branch problem.
According to technique scheme, can not the consideration regional balance of in-situ balancing, exceeding available compensation capacity for required compensation or do not have the node of reactive power compensator, the compensation capacity that will be unable to arrange is transferred to around have on the reactive power source of capacity sufficient, it is achieved regional balance.
According to technique scheme, according to the requirement of idle regional balance, the reactive capability that need to be shifted by each node, distribute to the reactive source of surrounding by certain branch philosophy, progressively reduce the idle amount of unbalance of this node, make the reasonable layout on the reactive power feasible region balanced basis of all nodes.
According to technique scheme, consolidation method nearby is used to process reactive-load compensation Discretization, consolidation method nearby is exactly first to be processed as continuous variable by discrete variable, again by the result consolidation tried to achieve to immediate centrifugal pump, concrete way is, reactive-load compensation amount Q of the node i obtained after having shifted reactive-load compensationshunti, according to electric capacity/reactor list pool-size and the group number structure discretization compensation capacity sequence C={ c of node i1, c2, c3..., cn, select nearest compensation capacity value as the final offset of node i.
Beneficial effects of the present invention:
1) idle automatic arrangement method based on DC power flow can configure existing reactive-load compensation equipment, it is achieved idle in-situ balancing according to the resulting estimate reactive loss of DC power flow.
2) idle automatic arrangement method based on DC power flow is for the mode data arranging grid structure and parameter, generated output and payload properly, it is possible to provides the most initial reactive-load compensation allocation plan, forms the initial trend mode of convergence.
3) idle automatic arrangement method based on DC power flow is simple and practical, there is not calculating scale and convergence problem, though result of calculation is not optimal solution, but disclosure satisfy that the requirement of initial trend mode, it is simple to promote.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment
A kind of reactive power compensation ability method, comprises the steps:
(1) equipping rules is established: including two principles, one is idle in-situ balancing principle, a principle being to consider reactive-load compensation equipment available resources；
(2) according to two principles, first according to it has been determined that power network wiring mode, power supply and load carry out DC power flow calculating, obtain the APPROXIMATE DISTRIBUTION that branch road is meritorious；
The Load flow calculation used and idle work optimization software for calculation carry out inductive reactive power compensation optimization calculating, each ingredient of electrical network can be modeled by this software, carry out the Load flow calculation of major network, and use catastrophic genetic algorithm to realize optimal reactive power allocation and planning, and optimal reactive power dispatch；Catastrophic genetic algorithm increases the catastrophe factor on the basis of genetic algorithm, overcome the defect of traditional genetic algorithm Premature Convergence, have that global optimizing ability is strong, search efficiency high, be suitable for the Reactive Power Optimazation Problem of uncertain factor non-linear, discontinuous, many.
(3) then according to branch road gain merit calculate node preferable reactive-load compensation amount；
(4) finally consider reactive-load compensation available resources, ideal compensation amount is shifted and discretization, it is achieved idle in-situ balancing, form the reactive-load compensation allocation plan of the whole network.
Pay the utmost attention to the in-situ balancing of each candidate compensation buses, for there being the node of idle compensating for resource, realize, first with reactive power compensator itself, the in-situ balancing that node is idle, it is impossible to in-situ balancing consider further that branch problem；Can not the consideration regional balance of in-situ balancing, available compensation capacity is exceeded for required compensation or there is no the node of reactive power compensator, the compensation capacity that will be unable to arrange is transferred to around have on the reactive power source of capacity sufficient, it is achieved regional balance.
Requirement according to idle regional balance, the reactive capability that each node need to be shifted, distribute to the reactive source of surrounding by certain branch philosophy, progressively reduce the idle amount of unbalance of this node, make the reasonable layout on the reactive power feasible region balanced basis of all nodes；Consolidation method nearby is used to process reactive-load compensation Discretization, consolidation method nearby is exactly first to be processed as continuous variable by discrete variable, again by the result consolidation tried to achieve to immediate centrifugal pump, concrete way is, reactive-load compensation amount Q of the node i obtained after having shifted reactive-load compensationshunti, according to electric capacity/reactor list pool-size and the group number structure discretization compensation capacity sequence C={ c of node i1, c2, c3..., cn, select nearest compensation capacity value as the final offset of node i.
For the mode data arranging grid structure and parameter, generated output and payload properly, calculate DC power flow, according to branch road effective power flow distribution estimation node ideal reactive-load compensation amount, and consider the actual installation situation of shunt capacitance reactor, configure existing device resource, it is achieved idle in-situ balancing.The method, without complicated optimized algorithm, does not calculate scale and convergence problem, it is adaptable to the generation of initial trend mode, it is possible to obtains the most initial reactive-load compensation configuration, contributes to formulating the rational method of operation, it is achieved the automatization that mode arranges.
Sample calculation analysis is based on certain regional power grid data, and this electrical network has 3160 nodes, 2378 circuits, 2639 transformer branch.As a example by a certain actual operating of this electrical network, for mode data have been arranged properly generated output and load, context of methods is utilized to arrange reactive-load compensation.Respectively according to after node ideal compensation, after reactive-load compensation transfer and after reactive-load compensation discretization, the result in 3 stages configures reactive-load compensation, and uses PSD-BPA program to carry out Load flow calculation.
In the case of not arranging reactive-load compensation, Load flow calculation is not restrained；Being primarily based on DC power flow and calculate node ideal reactive-load compensation, after the configuration reactive-load compensation of ideal compensation result, Load flow calculation is restrained, and Newton-Raphson approach iterations is 8 times.Then according to the shunt capacitance reactor data of this electrical network actual disposition, ideal compensation data are carried out idle transfer to calculate.After transfer result configuration reactive-load compensation, Load flow calculation is restrained, and Newton-Raphson approach iterations is 10 times.After reactive-load compensation transfer, trend convergence is declined slightly, but amount to be compensated has been effectively transferred in system be configured with the node of shunt capacitance reactor, more tallies with the actual situation.Finally carry out reactive-load compensation amount discretization.Carry out discretization calculating according to the shunt capacitance reactor situation of actual disposition in electrical network, and after configuring reactive-load compensation according to the result after discretization, Load flow calculation is also restrained, Newton-Laphson method iteration 10 times, little with the result difference after transfer.Reactive-load compensation allocation plan now is i.e. one and considers actual reactive apparatus available resources, is available for the initial reactive-load compensation allocation plan that the method for operation uses.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (6)
1. a reactive power compensation ability method, it is characterised in that comprise the steps:
(1) equipping rules is established: including two principles, one is idle in-situ balancing principle, a principle being to consider reactive-load compensation equipment available resources；
(2) according to two principles, first according to it has been determined that power network wiring mode, power supply and load carry out DC power flow calculating, obtain the APPROXIMATE DISTRIBUTION that branch road is meritorious；
(3) then according to branch road gain merit calculate node preferable reactive-load compensation amount；
(4) finally consider reactive-load compensation available resources, ideal compensation amount is shifted and discretization, it is achieved idle in-situ balancing, form the reactive-load compensation allocation plan of the whole network.
A kind of reactive power compensation ability method the most according to claim 1, it is characterized in that, the Load flow calculation that described method (2) uses and idle work optimization software for calculation are to carry out inductive reactive power compensation optimization calculating, each ingredient of electrical network is modeled by this software, carry out the Load flow calculation of major network, and use catastrophic genetic algorithm to realize optimal reactive power allocation and planning, and optimal reactive power dispatch.
A kind of reactive power compensation ability method the most according to claim 1, it is characterized in that, pay the utmost attention to the in-situ balancing of each candidate compensation buses, for there being the node of idle compensating for resource, realize, first with reactive power compensator itself, the in-situ balancing that node is idle, it is impossible to in-situ balancing consider further that branch problem.
A kind of reactive power compensation ability method the most according to claim 1, it is characterized in that, can not the consideration regional balance of in-situ balancing, available compensation capacity is exceeded for required compensation or there is no the node of reactive power compensator, the compensation capacity that will be unable to arrange is transferred to around have on the reactive power source of capacity sufficient, it is achieved regional balance.
A kind of reactive power compensation ability method the most according to claim 1, it is characterized in that, requirement according to idle regional balance, the reactive capability that each node need to be shifted, the reactive source of surrounding is distributed to by certain branch philosophy, progressively reduce the idle amount of unbalance of this node, make the reasonable layout on the reactive power feasible region balanced basis of all nodes.
A kind of reactive power compensation ability method the most according to claim 1, it is characterized in that, consolidation method nearby is used to process reactive-load compensation Discretization, consolidation method nearby is exactly first to be processed as continuous variable by discrete variable, again by the result consolidation tried to achieve to immediate centrifugal pump, concrete way is, reactive-load compensation amount Q of the node i obtained after having shifted reactive-load compensationshunti, according to electric capacity/reactor list pool-size and the group number structure discretization compensation capacity sequence C={ c of node i1, c2, c3..., cn, select nearest compensation capacity value as the final offset of node i.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109787245A (en) * | 2019-01-28 | 2019-05-21 | 西安交通大学 | A kind of microgrid reactive power compensation device configuration method based on control characteristic and economy |
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| CN103401249A (en) * | 2013-07-22 | 2013-11-20 | 国家电网公司 | Reactive power automatic arrangement method based on available resource of reactive equipment |
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| CN103401249A (en) * | 2013-07-22 | 2013-11-20 | 国家电网公司 | Reactive power automatic arrangement method based on available resource of reactive equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787245A (en) * | 2019-01-28 | 2019-05-21 | 西安交通大学 | A kind of microgrid reactive power compensation device configuration method based on control characteristic and economy |
| CN109787245B (en) * | 2019-01-28 | 2020-08-18 | 西安交通大学 | Microgrid reactive power compensation device configuration method based on regulation characteristics and economy |
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Application publication date: 20160824 |