Study on operation characteristics and output capacity of large-scale wind power base transmission system with series compensation

Abstract

Renewable energy develops very fast in China, and China has become the largest and fastest growing country of wind and PV power in the world. But the distribution of the wind/solar energy and load center is disharmonious, with the major wind fields and the solar fields being distributed in the area which is short of load, and making large-scaled, longdistance wind and PV power transmission is imperative. The problem of stability of large-scale wind and PV power grid integrated system into the high impedance weak grid is becoming more and more important. In order to shorten the electrical distance for wind power integration, the use of series compensation technology is an economically viable approach. In this paper, operation characteristics and output capacity of large-scale wind power base transmission system with series compensation will be studied. Based on the analysis of the load flow distribution and voltage characteristics of large-scale wind power base, the influence of different grid integration impedance, wind power output level and reactive power control mode of wind turbine on the operation range of wind power base should be studied, and the paper also analyzes the influence of different series compensation capacities on the voltage stability margin of large-scale wind power output system, and studies the effect of different series compensation on the delivery capacity of large-scale wind power base integrated to weak power system through sensitivity analysis. Considering the reactive power control capability of the wind turbine, the operation range of the parallel reactive power compensation in the wind farm, and the reactive power and voltage characteristics of the system after the installation of series compensation, the reactive power and voltage coordination control of the large wind power base scheme will be proposed in the paper.