风电并网前后的系统短路故障特性分析与仿真

摘要

由于风力发电出力的不稳定性从而导致风电并网将对系统原有的运行控制方式产生了一系列的挑战，为了更清晰直观了解到风电并网后对系统运行所产生的各方面影响。本文首先对目前主流风机类型双馈感应发电机组原理进行分析，同时采用直接并网模式构建了双馈感应风力发电机组并网前后系统发生三相短路故障的Matlab / Simulink仿真模型，并运用FFT分析并网前后三相短路故障特性，观察风电并网对系统动态稳定性的影响。仿真结果表明风力发电机组并入系统后比未并入时，系统发生短路故障所引起系统电压电流出现短时震荡更大、谐波畸变率更高，同时电压出现闪变现象也更加明显。%Due to the instability of wind power output from the cause of grid connected wind power will be the original of the operation of the system control mode produces a series of challenges, in order to be more clear and intuitive understanding to grid connected wind power for the operation of the system arising from various aspects of the impact. Firstly the current mainstream fan type doubly fed induction generator principle analysis, while using direct grid connected mode construct a three-phase short circuit fault of MATLAB / Simulink simulation model of grid connected doubly fed induction generator wind turbine and the system, and the use of the FFT analysis before and after the grid connected three-phase short circuit fault characteristics, to observe the impact of wind power integration on power system dynamic stability. Simulation results show that incorporated into the wind turbine system than not incorporated, short circuit fault caused by system voltage and current short-term shocks greater, harmonic distortion rate higher. At the same time, voltage fiicker phenomenon is more obvious.