电压单相跌落下VSG输出平衡电流控制策略

电网发生单相电压跌落会造成双馈风机变换器输出电流不平衡、冲击电流过大。传统虚拟同步控制策略以理想电压为基础建模，无法应对电压负序分量与正序分量耦合的情况，将直接影响电流环和脉冲宽度调制信号输出的稳定性。针对这一问题，提出了解耦双同步坐标系下基于单相Park变换的虚拟同步控制策略(DDSRF-VSG-Spark)。首先，通过解耦双同步参考坐标系实现正序分量与负序分量解耦，然后采用单相Park变换技术实现脉冲宽度调制信号和电流的稳定输出。最后，通过仿真对比验证，电网电压单相跌落期间，DDSRF-VSG-Spark能够保证系统的稳定运行。

Virtual Synchronous Generator Output Balance Current Control Strategy Under Single-Phase Voltage Drop

Single-phase voltage drop in the grid will cause the unbalanced output current and the large impulse current of doubly\|fed induction generator (DFIG). The traditional virtual synchronous generator (VSG) control strategy is modeled on the basis of ideal voltage, which cannot cope with the coupling of negative and positive sequence component of voltage. It will directly affect the stability of current loop and pulse width modulation signal output. Aiming at this problem, a virtual synchronous control strategy based on single-phase Park transformation in decoupled dual synchronous coordinate system (DDSRF-VSG-Spark) is proposed. Firstly, the positive and negative sequence component are decoupled by decoupling the double synchronous reference frame. Then the single-phase Park transformation technology is used to realize the stable output of pulse width modulation signal and current. Finally, through simulation comparison, it is verified that DDSRF-VSG-Spark can ensure the stable operation of the system during single-phase grid voltage drop.