Distributed fan voltage fluctuation stabilizing control method

Abstract

The invention relates to a distributed fan voltage fluctuation stabilizing control method. The method comprises the following steps: step 1: the optimized output power is obtained by stabilizing the kinetic energy of a fan rotor for the fan; and step 2: the active power and the reactive power of the optimized output power are inputted into the link control of different frequency of voltage controlafter frequency division and the voltage level deviation and the high frequency voltage fluctuation are controlled respectively. The voltage problem in the distributed wind power is decomposed into the voltage level deviation problem and the voltage fluctuation problem to be stabilized by using the active power-reactive power combined control method. The characteristics of active power fluctuation and voltage fluctuation of the grid-connected fan are studied, and the combined stabilizing control method of rotor kinetic energy smoothing power and frequency-divided reactive power control stabilizing voltage is put forward through analysis so as to realize the dual suppression of voltage fluctuation of the distributed fan terminal. Compared with the methods in the prior art, the method has the advantages of low reactive power capacity requirement and wide application range and the like.

Description

technical field [0001] The invention relates to the technical field of fan stabilization control, in particular to a distributed fan voltage fluctuation stabilization control method. Background technique [0002] At present, there are few literatures dedicated to the voltage fluctuation stabilization of distributed wind turbines. The voltage fluctuation of large-scale wind farms can be stabilized by external reactive power compensation devices, but for distributed wind turbines involving a wide area, centralized reactive power compensation cannot be performed, and the economical efficiency of external equipment for each wind turbine is poor. Therefore, it is necessary to fully exploit the reactive power adjustment capability of the wind turbine itself, and realize the stabilization of the voltage fluctuation of the distributed wind turbine under a reasonable control method. [0003] Commonly used reactive power control methods are divided into three types: constant reactive...

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Problems solved by technology

[0004] Adding static var compensator (Static Var Compensator, SVC), static var generator (Static Var Generator, SVG) and other equipment as reactive power will increase additional investment costs, which is not suitable for distributed wind power

In the current control method, the constant reactive power control does not participate in the regulation of the voltage fluctuation component, and its practical application is less; the constant voltage control method adopts the reactive power-voltage closed-loop control, which can theoretically stabilize the voltage fluctuation under the condition of sufficient reactive power capacity. The effect is the best and helps to improve the voltage stability of the grid-connected point, but the reactive power-voltage closed-loop control of multiple wind turbines at the same time may cause abnormal reactive power flow, and the on-load regulation commonly used in feeder voltage regulation in distributed access scenarios Transformers limit its application, so it is not suitable in the distributed field

Constant power factor control (including unit power factor control) maintains a fixed ratio of active and reactive power, which can take into account the maximum power generation and reactive power regulation. It is the most widely used, but how it affects voltage fluctuations and how to design the power factor can be controlled The best way to smooth out voltage fluctuations is unclear

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