双馈风力发电机组网侧变换器电压空间矢量电流滞环控制

Hysteretic current control for the grid-side converter of a double-fed wind generator with voltage space vector

利用电压空间矢量滞环电流控制(VSM-HCC)和变速PI电压控制,实现了变速恒频(VSCF)双馈风力发电机组网侧变换器功率双向流动和直流侧电压稳定的控制目的。电压空间矢量调制方法的引入,降低了变换器的开关频率,同时也保留了滞环控制响应快、简单及鲁棒性好等优点。通过增加负载电流前馈补偿环节,提高了系统的响应速度,有效抑制了直流侧电压的波动。仿真验证了该控制策略比传统的双闭环PI控制对外部扰动有更好的自适应能力和良好的动态性能,并示出与VSCF双馈风力发电机组进行联调仿真的结果。

In order to achieve the purposes of constant DC-hnk voltage and bidirectional power flow for the grid-side converter of a variable speed constant frequency （ VSCF ） double-fed wind generator, a method of hysteretic current control with voltage space vector modulation method （VSM-HCC） and voltage PI control based on changing integration rate was proposed. VSM strategy was introduced into the control system to reduce the switching frequency. Meanwhile, it preserved the merit of hysteretic control such as quick response, simple and good robustness. The system response speed was increased and the DC-link voltage fluctuation was restrained effectively due to the load current feed-forward compensation. The results of simulation comparison with the traditional double close-loop PI control confirm show that this method exhibits self-adapted ability to external disturbances and good performance, and the simulation study is carried out with VSCF wind generation system.