双馈风机参与调频的速度控制器模糊协同控制及参数校正策略

双馈风机调频的目的是通过释放转子动能对电网提供有功支撑,然而以速度控制器为代表的固有控制环节,其控制目标是维持转子转速稳定运行,两者控制目标的差异性将会引发调频性能与风机运行安全的冲突。为此,提出了双馈风机调频阶段速度控制器模糊协同控制及参数校正策略。首先,为明确调频阶段风机调频参数特征,利用风机转子动能、桨距角减载与虚拟惯量和一次调频的能量对应模式,提出了风机调频控制环节参数与运行点的映射等值模型;其次,考虑以速度控制器为主的风机固有控制环节,分析了速度控制器参数对惯性响应环节的影响,基于模糊逻辑算法提出了提升电网频率控制效果的速度控制器动态运行算法,缓解了与调频环节间的固有矛盾;最后,构建仿真模型对所提策略进行验证,结果表明所提方法可有效协调风机当前运行点以及风机调频控制、风机固有控制等环节的调频性能,提升电网的频率控制支撑能力。

Fuzzy Cooperative Control and Parameter Correction Strategy of Speed Controller in Frequency Modulation Stage of Doubly-fed Induction Generator

The control objective of DFIG in frequency regulation stage is to provide active power support for the power grid by releasing the rotor kinetic energy.However,the control objective of inherent control link represented by the speed controller is to maintain the stable operation of the rotor speed.The difference between the two control objectives will lead to conflicts between frequency regulation performance and operation safety.Therefore,the fuzzy cooperative control and parameter correction strategy of the speed regulator in the frequency regulation stage of DFIG are proposed.Firstly,in order to clarify the characteristics of fan frequency regulation parameters in the frequency regulation stage,the mapping equivalent model between the parameters of frequency regulation control link and the operating point is proposed by using the energy corresponding modes of the rotor kinetic energy,the pitch angle load shedding and the virtual inertia and the primary frequency regulation.Secondly,considering the inherent control link of fan dominated by the speed controller,the influence of speed controller parameters on the inertia response link is analyzed.Based on the fuzzy logic algorithm,a speed controller speed controller dynamic operation algorithm is proposed to improve the power grid frequency control effect,which alleviates the inherent contradiction between the speed controller and the frequency regulation link.Finally,a simulation model is built to verify the proposed strategy.The results show that the proposed method can effectively coordinate the frequency regulation performance of the current operation point of the wind turbine,the frequency regulation control of the wind turbine and the inherent control of the wind turbine,and that it improves the efficiency of the frequency regulation performance and enhances the frequency control support capacity of the power grid.