计及阻容式撬棒的混合型风电场协同控制及故障特性分析

为解决混合型风电场低穿措施复杂难以协同及低穿后故障特性难以分析的问题，提出双馈风电机组应用阻容式撬棒以改善低电压穿越期间混合型风电场的频偏及无功特性。首先建立双馈风电机组群与永磁直驱风力发电机组群模型，通过分群聚合等效的方法建立混合型风电场简化等效模型。在此基础上，分析计及阻容撬棒的混合型风电场故障期间各类型风电机组的无功调节能力及调节特性。据此制定混合型风电场的无功协同控制策略以优化低电压穿越期间无功输出能力，分析采用协同控制策略后混合型风电场的短路特性，并对短路电流进行解析。最后基于PSCAD/EMTDC仿真软件建立了混合型风电场仿真模型，对协同策略的有效性及故障电流表达式的正确性进行仿真验证。

Synergetic control and fault characteristics analysis of hybrid wind farm considering resistance-capacitance crowbar

There is a problem that the low-voltage ride-through measures of a hybrid wind farm are complex and difficult to cooperate with and the fault characteristics after low-voltage ride-through are difficult to analyze. Thus it is proposed that a resistance-capacitance crowbar is applied to the doubly-fed wind turbine to improve the frequency offset and reactive power characteristics of the hybrid wind farm during low-voltage ride-through. First, the models of doubly-fed wind turbine group and permanent magnet direct-drive wind turbine group are established, and a simplified equivalent model of a hybrid wind farm is established by the method of grouping and aggregating equivalence. Then the reactive power regulation ability and regulation characteristics of various types of wind turbines during a fault in the hybrid wind farm considering the resistance-capacitance crowbar are analyzed. The reactive power cooperative control strategy of the hybrid wind farm is formulated to optimize the reactive power output capacity during low voltage ride-through. The short-circuit characteristics of the hybrid wind farm after adopting the cooperative control strategy are analyzed and the short-circuit current is analyzed. Finally, based on PSCAD/EMTDC simulation software, a hybrid wind farm simulation model is established to verify the effectiveness of the collaborative strategy and the correctness of the fault current expression.