大型分布式电源模型化研究及其并网特性分析——(二)双馈风机专题

摘要

就大型双馈风机风电场各系统进行了模型化研究,确立了风机模型、整流电路、逆变电路、桨距控制系统等数学模型.基于这些模型,对大型双馈风机风电场风机输出功率特性,在复杂电网环境中的输出电压、电流特性进行了理论分析,并着重分析了大型双馈风机风电场在系统侧故障状态下的各种响应特性和其低电压穿越能力,以及输出谐波、电压波动等其他电能质量方面的问题.部分实验验证和仿真结果表明所建立的大型双馈风机风电场模型及其并网特性分析具备一定的正确性,为国家今后新能源战略提供了一定的理论基础和并网指导.%This paper researches system modeling of the large-scale wind power plants with double-fed introduction generator (DFIG) , and establishes the mathematic model of the wind turbine, the rectifier and inverter circuits, the pitch control system, and so on. Based on these models, the wind turbine output power characteristics of the large-scale wind power plants with DFIG, and the output voltage and current characteristics in a complex network environment are analysed theoretically, and some problems are emphasized, which include the response characteristics and the low voltage ride through of the large-scale wind power plants with DFIG in the fault condion of the line-side, and the problems in the power quality, such as the output of harmonics, the voltage fluctuation and so on. Part of the experiment and simulation results demonstrate the accuracy of the model of the large-scale wind power plants with DFIG and the integration characteristics, which could provide theoretical basis and guide for wind farm integration for the new energy strategy of China in the future.