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Reactive power compensation method for doubly-fed wind power system

A compensation method, double-fed wind power technology, applied in reactive power adjustment/elimination/compensation, flexible AC transmission system, wind power generation, etc.

Active Publication Date: 2016-03-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0005] The present invention aims at the problem of the influence of factors such as wind energy volatility and intermittency on the stability of the system when new energy is connected to the doubly-fed wind power system, and proposes a reactive power compensation method for the doubly-fed wind power system. The system adopts the theory of sliding mode control, and the static synchronous compensator STATCOM is designed with a nonlinear robust controller. The designed controller is robust to the uncertainty of parameters such as STATCOM and external disturbances, and effectively improves the reliability of the new energy power system. Dynamic and static stability

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  • Reactive power compensation method for doubly-fed wind power system
  • Reactive power compensation method for doubly-fed wind power system
  • Reactive power compensation method for doubly-fed wind power system

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Embodiment Construction

[0025] Such as figure 1 It is a schematic diagram of a doubly-fed wind power hybrid system in island mode, in which the wind power generation system includes two doubly-fed induction generators (DFIG), and each of the two DFIGs uses a rotor-side converter (RSC), and the shared one can generate a certain The reactive power of the bus side converter (LSC) with reactive power is Q LSC , while Q DFIG1 , Q DFIG2 Respectively are the reactive power absorbed by the two DFIGs during operation; the biomass power generation system uses a synchronous generator, which is excited by an excitation regulator, and the reactive power emitted by it is Q SG ; and STATCOM, as an additional reactive power compensation device of the system, is connected to the system bus to provide sufficient reactive power support for the system. It collects the system bus voltage and compares it with the reference voltage to generate a voltage deviation signal input device. Act on the converter of STATCOM to m...

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Abstract

The invention relates to a reactive power compensation method for a doubly-fed wind power system. On the basis of a small-signal mathematical model of a static synchronous compensator, a designed sliding mode surface and a sliding mode controller designed on the basis of a reaching law arrival condition can effectively solve the problem of voltage fluctuation, caused by changes of a fan input power and a reactive power load, in an individual wind-electricity hybrid power system and the problem of uncertainty of parameters of a static synchronous compensator model; simulation is carried out through applying a step or random perturbation to the fan input power and the reactive power load in the individual wind-electricity hybrid power system; and the simulation result confirms the validity of the method provided by the invention.

Description

technical field [0001] The invention relates to a wind power generation technology, in particular to a reactive power compensation method of a doubly-fed wind power system based on sliding mode control with an additional static synchronous compensator. Background technique [0002] With the maturity of wind power technology, wind power, as the renewable energy with the best scale development and commercial development prospects in the world, has attracted more and more attention from all over the world. The isolated island hybrid wind power generation system is an effective power supply mode to solve the problem of electricity consumption in islands and remote villages, but wind energy is random and intermittent due to the influence of the weather, which will affect the stability of the system voltage. If it is not controlled seriously, it will cause the system Voltage collapse. Due to its variable speed and constant frequency characteristics, doubly-fed wind turbines have ...

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Application Information

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IPC IPC(8): H02J3/18H02J3/38
CPCH02J3/18H02J3/386H02J2203/20Y02E10/76Y02E40/10
Inventor 米阳马超韩云昊吴彦伟杨慧霞符杨魏书荣
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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