Centralized and local microgrid real-time voltage control method and system
A real-time voltage and control method technology, applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve the problems of reliability affected by communication, long control cycle, poor voltage control effect, etc., and achieve fast and efficient voltage over-limit problem, solve the voltage limit problem, reduce the effect of dependence and demand
Active Publication Date: 2019-09-03
SHANDONG UNIV
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Problems solved by technology
[0005] (1) Centralized and partially distributed voltage control largely depends on grid communication requirements, the control cycle is long and reliability is affected by communication, and it is difficult to meet real-time control requirements;
[0006] (2) In the local voltage control method, the control curve is given according to a certain rule, which is difficult to adapt to the changes of grid parameters and DG power, and the voltage control effect is poor;
[0007] (3) The influence of active power on voltage in microgrid is more significant than that of reactive power, and there is a lack of coordinated control of active power and reactive power of some voltage regulating equipment
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[0034] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
[0035] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0036] Terminology explanation part: DG: distributed power generation, PV: photovoltaic power generation unit, SL: controllable...
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The disclosure proposes a centralized and local microgrid real-time voltage control method and system. The method comprises a centralized optimization control step of: predicting the active output ofa distributed power source of a microgrid within a set time, acquiring the voltage values of microgrid voltage regulating devices at a grid-connected point at various moments, establishing a microgridvoltage optimization control model to achieve the minimum network loss, and obtaining the optimal power values of the voltage regulating devices at respective moments by solving the optimization problem; and a local voltage control step of: according to the obtained voltage values of the voltage regulating devices at the grid-connected point at respective moments and the corresponding optimal power values, generating a local voltage control curve of each voltage regulating device based on a piecewise linear fitting method, and controlling the active power and the reactive power correspondingto each voltage regulating device in a centralized manner based on the curve. The method corrects the local voltage control curve based on the piecewise linear fitting, can quickly and efficiently solve the out-of-limit voltage of the microgrid, and ensures the optimal operation of the microgrid.
Description
technical field [0001] The present disclosure relates to the technical field of microgrid voltage control, in particular to a method and system for real-time voltage control of a microgrid combining centralized and local methods. Background technique [0002] In order to solve the problems of fossil energy depletion and environmental pollution, more and more renewable energy resources (RES) are connected to the grid in the form of distributed generation (DG), which makes the traditional distribution network change from passive to active. for the initiative. At the same time, as an effective means of centralized management and control of DG, microgrid technology has received extensive attention. Through the adjustment and control of DG in the microgrid, it can effectively reduce the power loss, improve the voltage level, improve the economic and environmental benefits of the grid, and realize the optimal operation of the microgrid. [0003] The access of DG brings more cont...
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IPC IPC(8): H02J3/46H02J3/12
CPCH02J3/46H02J3/12H02J2203/20
Inventor 张文孙显卓
Owner SHANDONG UNIV