不对称电网故障时风电网侧变流器控制的数/模仿真

Physical/Digital Simulation of Grid-side Converter Control During Unbalanced Grid Faults

不对称电网故障时网侧变流器的有效控制,对提高风电机组的并网运行能力具有重要意义。文中采用优选的序分量分解算法,设计了基于正、负序双dq电流调节的网侧变流器控制策略。为验证控制策略并克服纯数字仿真和物理实验的缺点,采用实时数字仿真器(RTDS)和自主开发的数字信号处理器(DSP)控制器,构建了双馈风电机组数/模混合仿真系统。对一台2 MW机组的数/模混合仿真证明了控制策略的正确性和方案的有效性。

The effective control of grid-side converter （GSC） during unbalanced grid faults is important for grid-connected wind power generator＇s capability. Along with the optimal selection of sequence components decomposition method, the control strategy of GSC is designed based on double dq currents regulation of positive sequence and negative sequence. In order to verify the proposed strategy and overcome the drawbacks of traditional pure digital simulation and physical experiment, one digital/physical hybrid simulation system of. doubly-fed wind turbine generator is constructed by using real-time digital simulator （RTDS） and self-developed digital signal processor （DSP） controller. The digital/physical hybrid simulation of a 2 MW wind turbine generator verifies the eon＇trol strategy and scheme.