Adjusting method based on comprehensive considering of voltage and reactive power for SVG (Static Var generator) of wind power plant

Abstract

The invention relates to an adjusting method based on comprehensive considering of voltage and reactive power for an SVG (Static Var generator) of a wind power plant, belonging to the technical field of automatic voltage and reactive power adjusting of a wind power plant. The method comprises the following steps: correcting target voltage values into an upper limit value and a lower limit value according to emergency upper and lower limits of voltage, a qualified bandwidth of voltage and a voltage adjusting dead zone; determining whether to carry out "constant-voltage" adjusting or "constant reactive power" adjusting according to the condition whether the current voltage is beyond the range of the lower limit value to the upper limit value or not; when carrying out "constant-voltage" adjusting, determining the reactive power adjusting variable according to the out-of-limit amount; when carrying out "constant-voltage" adjusting, determining the reactive power adjusting variable according to a target reactive power value; and verifying the reactive power adjusting variable according to the upper and lower limits of voltage and a reactive power adjusting step length. According to the adjusting method, the voltage of a point of common coupling is given a priority to be controlled between the upper and lower limits required as dispatching; therefore, the voltage qualified rate of the wind power plant is improved, the accurate adjustment of reactive power output can be realized under the condition of qualified voltage, and 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, and in particular relates to a method for adjusting dynamic reactive power compensation devices in wind farms with comprehensive consideration of voltage and reactive power. 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...

AI Technical Summary

Problems solved by technology

The actual operation found that when the "constant voltage" adjustment method is adopted, if there are multiple SVG devices installed in the wind farm, the problem of SVG reactive power adjustment will be opposite to the positive and negative directions and the oscillation will be intensified; when the "constant reactive power" adjustment method is adopted, due to There must be a time difference between the data acquisition of the AVC substation and the conversion calculation of the reactive power adjustment, and the phenomenon that the SVG reactive power adjustment is in place but the voltage is not qualified will appear.