Offshore wind plant reactive power optimization configuration method considering wind turbine generator reactive power regulation

Abstract

The invention discloses an offshore wind plant reactive power optimization configuration method considering wind turbine generator reactive power regulation. The method specifically comprises the steps of selecting compensation points and compensation modes according to the capacity and the conveying distance of an offshore wind plant; establishing an offshore wind plant equivalent model, optimizing the compensation capacity and the grouping number of high-voltage shunt reactors according to reactive requirements of the offshore wind plant at different active output levels, and formulating a PDFIG-n table; according to the requirements of offshore wind plant grid connection technical specifications for voltage, optimizing the compensation capacity of an SVG device through dynamic simulation, and ensuring transient voltage stability; and according to the optimized compensation capacity, coordinating and optimizing the reactive power output of the wind turbine generator and a reactive power compensation device by taking static voltage stability and low operation cost as targets and utilizing the reactive power regulation capability of the wind turbine generator. According to the method, the static and transient voltage stability of the offshore wind power plant is considered, the reactive power regulation capability of the wind turbine generator is fully utilized, and the economyand safety of a reactive power configuration scheme are improved.

Description

technical field [0001] The invention belongs to the technical field of reactive power compensation of wind farms in electric power systems, and in particular relates to a reactive power optimization configuration method for offshore wind farms that takes into account the reactive power adjustment of wind turbines. Background technique [0002] In recent years, offshore wind power has been widely used around the world due to its advantages of cleanness and environmental protection, rich power generation resources and suitable for large-scale construction. With the continuous expansion of the installed capacity and scale of offshore wind farms, the problem of reactive power allocation has gradually become prominent. On the one hand, high-voltage AC submarine cables are generally used in offshore wind power collection lines and transmission lines. Due to the geographical constraints of offshore wind farms, the selection of compensation points and compensation methods for react...

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Problems solved by technology

On the one hand, high-voltage AC submarine cables are generally used in offshore wind power collection lines and transmission lines. Due to the geographical constraints of offshore wind farms, the selection of compensation points and compensation methods for reactive power compensation devices is limited; and at present, there are few researches on reactive power allocation optimization strategies based on reactive power adjustment capabilities of doubly-fed units at home and abroad. The "Technical Regulations for Connecting Offshore Wind Farms to the Grid" does not make clear regulations on the allocation constraints of reactive power resources for doubly-fed wind turbines, and lacks practical technical guidelines and evaluation methods

[0003] At present, offshore wind farms generally adopt double-fed asynchronous wind turbines with variable speed and constant frequency operation, which can realize decoupling control of active power and reactive power, and can flexibly adjust reactive power output without affecting active power output. The power factor or constant power factor mode operation fails to make full use of the fast and flexible reactive power adjustment capability of the unit itself, and relies on large-capacity reactive power compensation devices for compensation, which reduces the economic efficiency of the wind farm

The relevant literature mainly focuses on the research on the reactive power limit of the doubly-fed asynchronous wind turbine and the reactive power voltage control strategy of the wind farm. Different optimization objectives are used for static optimization, and the compensation scheme has insufficient consideration for dynamic and transient stability, and has not yet taken into account both economy and safety

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