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An optimal reactive power control strategy for a DFIG-based wind farm to damp the sub-synchronous oscillation of a power system

机译：基于DFIG的风电场的最优无功功率控制策略，用于抑制电力系统的次同步振荡

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This study presents the auxiliary damping control with the reactive power loop on the rotor-side converter of doubly-fed induction generator (DFIG)-based wind farms to depress the sub-synchronous resonance oscillations in nearby turbogenerators. These generators are connected to a series capacitive compensation transmission system. First, the damping effect of the reactive power control of the DFIG-based wind farms was theoretically analyzed, and a transfer function between turbogenerator speed and the output reactive power of the wind farms was introduced to derive the analytical expression of the damping coefficient. The phase range to obtain positive damping was determined. Second, the PID phase compensation parameters of the auxiliary damping controller were optimized by a genetic algorithm to obtain the optimum damping in the entire subsynchronous frequency band. Finally, the validity and effectiveness of the proposed auxiliary damping control were demonstrated on a modified version of the IEEE first benchmark model by time domain simulation analysis with the use of DigSILENT/PowerFactory. Theoretical analysis and simulation results show that this derived damping factor expression and the condition of the positive damping can effectively analyze their impact on the system sub-synchronous oscillations, the proposed wind farms reactive power additional damping control strategy can provide the optimal damping effect over the whole sub-synchronous frequency band, and the control effect is better than the active power additional damping control strategy based on the power system stabilizator. © 2014 by the authors.
机译：这项研究提出了基于双馈感应发电机（DFIG）的风电场的转子侧变流器的无功功率回路辅助阻尼控制，以抑制附近涡轮发电机的次同步共振振荡。这些发生器连接到串联电容补偿传输系统。首先，从理论上分析了基于双馈风力发电机的风电场无功控制的阻尼效果，引入了涡轮发电机转速与风电场输出无功之间的传递函数，得到了阻尼系数的解析表达式。确定获得正阻尼的相位范围。其次，通过遗传算法对辅助阻尼控制器的PID相位补偿参数进行了优化，以在整个次同步频段上获得最佳阻尼。最后，通过使用DigSILENT / PowerFactory进行时域仿真分析，在IEEE第一基准模型的修改版本上论证了所提出的辅助阻尼控制的有效性和有效性。理论分析和仿真结果表明，该推导的阻尼因子表达式和正阻尼条件可以有效地分析其对系统次同步振荡的影响，所提出的风电场无功附加阻尼控制策略可以在整个系统上提供最佳的阻尼效果。整个亚同步频带，其控制效果优于基于电力系统稳压器的有功附加阻尼控制策略。 ©2014作者。

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