双绕组异步风电机组同步化并网运行仿真研究

摘要

针对定子双绕组异步电机(DWIG)在并网运行条件下展开研究,通过对发电机的控制,使其在功率绕组侧输出稳定三相交流.借鉴同步发电机的运行控制策略,将有功-频率、无功-电压下垂控制方法移植到并网逆变器的控制中,使得逆变器有了频率与电压保持特性,从而在外特性上具有同步发电机的特征.提升了包括DWIG在内的整个风电机组并网运行性能,使其具备维持系统功率平衡、维持电网频率和电压稳定性等优点.有效缓解了风电大规模接入电网而对电网造成的不利影响.基于Simulink的仿真结果证明了系统和控制策略的正确性与有效性.%The research on the dual stator-winding induction generator (DWIG) under the condition of grid connected operation,through the control of the generator,so that it can output stable high DC voltage.Reference control strategy of synchronous generator,the virtual governor and the virtual exciter control are introduced into the grid connected inverter which makes the inverter has the frequency and voltage characteristics.The characteristic of the synchronous generator is characterized by the external characteristic.The grid operation performance of the whole wind turbine including DWIG is improved,the system has the advantages of maintaining the power balance of the system.Also the frequency and voltage stability of the power system can be improved.The negative effects of wind power access on the stability of the power grid are suppressed.The simulation results based on Simulink prove the correctness and effectiveness of the system and control strategy.