经VSC-HVDC系统并网的风电场反馈线性化滑模控制

以减少风电场并网对电网的影响及提高并网系统鲁棒性为目的,采用基于反馈精确线性化的滑模变结构控制策略对经高压直流输电并网的风电场系统两侧换流站的控制进行设计。首先建立电压源换流器在dq坐标系下的数学模型,然后采用基于精确线性化解耦的滑模变结构控制方法设计高压直流输电系统两侧换流站,解决传统双闭环控制方法调节能力差以及参数整定困难等问题,进一步提高控制系统的抗干扰能力与动态稳定性,最后在Matlab/Simulink中建立经高压直流输电系统并网的风电场仿真模型,对比加入滑模变结构前后的仿真波形图,验证控制系统的各方面性能。

Feedback linearization sliding mode control of wind farmconnected with VSC-HVDC system

In order to reduce the impact of wind farm grid-connected on power grid and improve the robustness of grid-connected system, a sliding mode variable structure control strategy with feedback precise linearization is adopted to design the control of converter stations on both sides of wind farm grid-connected system via flexible direct current transmission. Firstly,a mathematical model of the voltage source converter in the dq coordinate system is established. Then the sliding mode variable structure control method based on precise linearization decoupling is used to design the converter stations on both sides of flexible HVDC transmission system, which solves the problems of poor regulation ability and difficult parameter tuning of traditional double closed loop control method, and further improves the anti-interference ability and dynamic stability of the state feedback linearization control system. Finally, the simulation model of wind farm grid-connected flexible HVDC system is established in Matlab/Simulink. The simulation waveforms before and after adding sliding mode control are compared to verify the performance of the control system.