风力发电系统变流器的直接功率控制策略

以永磁直驱型风力发电系统为研究对象,针对其变流器结构和控制策略进行了研究。通过选择最优双PWM“背靠背”变流拓扑结构,并采用直接功率控制策略进一步提高了风力发电系统的并网性能。建立了输出功率为10 kW的并网系统仿真模型,验证控制策略的正确性。结果表明,基于直接功率控制策略的“背靠背”变流拓扑具有结构合理、控制策略新颖的优点,在保证直流侧电压稳定的同时,电网电流谐波畸变率低、波形良好,能够实现单位功率因数并网,满足并网要求。

Direct Power Control Strategy for Inverters of Wind Power Generation System

This paper proposes a control strategy for wind energy integration into power network,and researches the structure and its inverter. The optimal dual PWM ＂ back to back＂ converter topology and direct power control strategy are used to further enhance the wind power generation system and network performance. A network simulation model system with an output power of 10 kW is built to verify the correctness of the control strategy. The results show that the ＂ back to back＂ converter topology has the advantages of reasonable structure based on direct power control strategy,novel control strategy,stable DC voltage,low harmonic distortion of grid current and good waveform,achieving unity power factor and network and meeting the networking requirements.