Dynamic reactive power priority based automatic switching method of capacitor of wind power plant

Abstract

The invention relates to a dynamic reactive power priority based automatic switching method of a capacitor of a wind power plant, belonging to the technical field of voltage-reactive power automatic adjustment of a wind power plant. The method comprises the following steps: determining a total reactive adjusting variable according to the bus voltage of a point of common coupling, obtained from a monitoring system of the wind power plant and upper and lower values obtained from a main dispatching station; according to the current reactive power value, reactive power up adjustable range and reactive power down adjustable range of an SVG (Static Var generator) and the total reactive adjusting variable, determining the adjusting variable of the SVG and whether to switch the capacitor; and finally determining a capacitor switching scheme according to the operation status, daily switching frequency limit, monthly switching frequency limit and capacity of the capacitor. According to the method, through giving a use priority to the reactive power adjusting capability of the SVG, setting the daily switching frequency limit and monthly switching frequency limit of the capacitor, the switching frequency of the capacitor can be reduced largely and the the operation safety and reliability of the wind power plant can be improved.

Description

technical field [0001] The invention belongs to the technical field of automatic regulation of voltage and reactive power in wind farms, in particular to a method for automatic switching of capacitors in wind farms for dynamic reactive power priority regulation. Background technique [0002] The national standard GB / T19963-2011 "Technical Regulations for Connecting Wind Farms to Power Systems" points out that the reactive power supply of wind farms includes wind turbines and wind farm reactive power compensation devices. Wind farms should make full use of the reactive capacity and adjustment capabilities of wind turbines; when the reactive capacity of wind turbines cannot meet the needs of system voltage regulation, reactive power compensation devices with appropriate capacity should be installed in the wind farm (such as fixed capacitor banks ), if necessary, install a dynamic reactive power compensation device (SVG). [0003] According to the requirements of the national ...

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Problems solved by technology

However, since fixed capacitor banks can only be switched in groups, their reactive power output changes in steps, which will cause large fluctuations in the voltage at the grid-connected point of the wind farm

In addition, the switching times of the fixed capacitor bank are limited. Generally, wind farms do not include it in the automatic control system of reactive power and voltage, but switch it manually, which increases the labor burden of the operators on duty.