大功率直驱风机并网技术的研究

Research of the grid technology for high power Direct-driven wind Turbine

直驱型风力发电系统主要由风力机、永磁同步发电机、电力电子变流系统以及控制系统等模块组成。变流器可以使发电机发出的能量更好并网,因此在直驱风力发电系统中占据重要地位。针对变流器主电路的设计进行了研究,首先,分别对机侧滤波器和网侧滤波器进行设计和计算,其次,选择传统的加Y电容的方法来抑制共模电压。最后,利用M ATLAB软件并结合傅里叶FFT加以分析,仿真结果中频率2 k Hz为谐波存在频率段,此频率段满足风机并网的技术条件,验证了设计方案的可行性。

Direct-driven wind power generation system consists of the wind turbine, permanent magnet synchronous generator, power electronic systems and control systems. As an important module in the direct-drive wind power sys- tem, the inverter can make the synchronization better. In this paper, the main circuit for the inverter is designed. First- ly ,the filters on the machine side and network-side are designed and calculated respectively, and then the traditional method plus Y capacitors is chosen to suppress common mode voltage. Finally, MATLAB software combined with PTT Fourier method is used to analyze the control mode. The simulation results show that the harmonic frequency band is 2k Hz which meets the conditions for fans grid technologies, so verify the feasibility of the design.