Automatic dynamic voltage control system for wind power plant

Abstract

A wind farm automatic dynamic voltage control (AVC) system comprises: a AVC controller, multiple wind turbine control systems arranged on multiple wind turbines of the wind farm, a static reactive power compensation device (SVC), and multiple voltage transformers and current transformers arranged on wind power transmission lines, wind power assemble lines, SVC lines, high voltage buses and low voltage buses. Each wind power assemble line connects to the multiple wind turbines so as to receive the power output of the multiple wind turbines, and also connects to the low voltage buses. The AVC controller communicates with each wind turbine control system through an optical fiber network and electrically connects to the multiple voltage transformers and current transformers. The AVC controller determines the total reactive power that needs to be generated or absorbed by the wind farm, the total reactive power that can be generated or absorbed by each wind power assemble line and the total reactive power that can be generated or absorbed by each wind turbine, and sends the control signal corresponding to the reactive power that can be generated or absorbed by each wind turbine to the corresponding wind turbine control system.

Description

technical field [0001] The invention relates to a dynamic automatic voltage control (AVC) system of a wind farm, and more specifically, relates to an AVC system of a wind farm capable of dynamically compensating reactive power. Background technique [0002] With the development of technology, the attention and utilization of renewable energy are increasing day by day. Among them, wind power generation is a relatively mature energy technology. However, my country's wind power industry's development plan of "building large bases and integrating into large power grids" is different from Europe's "distributed grid connection and local consumption", and has the characteristics of "large-scale" and "high concentration". Intermittent wind power causes grid voltage fluctuations, increases in system short-circuit capacity, and changes in transient stability, especially when large-scale wind power is centrally connected to the grid. At the same time, the power quality at the end of t...

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Problems solved by technology

[0009] However, the AVC system of the wind farm according to the prior art has the following disadvantages: (1) To realize the voltage stability of the whole wind farm, it is necessary to install centralized reactive power compensation equipment (such as SVC or SVG), while SVC is expensive and has inherent losses, but its stability is not high; (2) When the bus voltage decreases, the ability of SVC to emit reactive power decreases, and its compensation ability decreases quadratically; (3) Prioritize the use of Centralized reactive power compensation equipment is not conducive to releasing the ability of wind turbines to generate reactive power, which causes waste of important reactive power sources; (4) The coordination between centralized reactive power compensation equipment and wind turbine operation is poor, and its characteristic is that it often lags behind real-time reactive power. power regulation demand

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