中文摘要：

双馈风机-串补输电系统存在次同步谐振的风险。为解决该问题,首先通过对风电串补输电系统建模,推导了风电串补输电系统的传递函数。然后通过对传递函数的分析,提出了附加阻尼控制方法。附加阻尼控制信号跟踪次同步电流的变化,修正相应输出电压,使得在次同步频率下变流器呈现正电阻,从而有效抑制谐振发生。采用次同步电流附加阻尼控制避免了基于多重旋转坐标系分频同步方法。该策略不影响原有控制器特性,且同步频率下的阻尼可调,因此可以有效抑制次同步谐振。通过算例仿真分析证明了所提出附加阻尼控制的合理性和正确性,该方法具有计算简单、便于实现等优点。

英文摘要：

Sub-synchronous resonance may occur in doubly-fed wind turbine series compensated transmission system. In order to better suppress sub-synchronous resonance from DFIG, transfer function of wind power transmission system is derived by modeling wind power series compensation system. Based on transfer function analysis, additional damping control method is proposed. Additional damping control signal tracking synchronous current changes corrects corresponding output voltage. This makes converter present positive resistance in sub-synchronous frequency, effectively inhibiting resonance occurrence. Additional damping control avoids synchronization based on multiple rotating coordinate systems. The strategy does not affect characteristics of original controller. Damping in the method can be adjusted to effectively suppress sub-synchronous resonance. With simulation and experiment, rationality and correctness of additional damping control are validated. The method has advantages of simple calculation and easy realization. 1