Research On Reactive Power Compensarion Of Power System With Large-scale Wind Farm

Large-scale wind power integration bring about significant influence for the safety and stable operation of power system. One of the most prominent problems is the integration of large scale wind farm can cause reactive power change, and then affect voltage stability, in severe cases even cause voltage collapse. Therefore,this paper is research on reactive power compensation of Large-scale Wind Power Integration, which has important realistic meaning and reference value. The Primary contents and original contributions of this dissertation are as follows:(1) Analyze the Doubly-fed induction generator (DFIG) operation principle and static mathematic model, and particularly research on the active power,reactive power characteristics.(2) Carry on research to the voltage stability static analysis method, reactive power/voltage common control measures, put forward theory support for subsequent reactive power compensation strategy in this paper.(3) Improve the differential evolution algorithm evolutionary strategy, put forward the improved one and apply to the study of wind farms power system reactive power compensation capacity, give the reactive power compensation strategy implementation process.(4) Particularly research on the specific format and the calculation results interaction output of Python and PSS/E mutual calls and data interaction, give the Python call PSS/E chart. Based on this, using Python to realize wind farms power system reactive power compensation technology via differential evolution algorithm, and give the detailed process flow.(5) Based on real grid data,combined with the characteristics of wind farms power system, give selection methods of differential evolution algorithm parameters, and determine the specific value which this paper simulation using. Simulation analysis on voltage level change results with using compensation strategy in this paper, analyze and compare effects of several different algorithms and different compensation modes. The results show that with using the reactive power compensation strategy which proposed in this paper, the stability of system obviously improved, so as to prove the proposed reactive power compensation strategy in this paper is effective and feasible.