摘要
为解决分布式风电接入电网带来的电压波动以及补偿装置谐波污染等电能质量问题,引入(inductance-capacitanceinductance,LCL)耦合型静止同步补偿器(static synchronous compensator,STATCOM)。针对系统非线性时变的特殊性和装置补偿性能的提升,提出LCL型STATCOM基于过渡过程的并网点电压外环非线性PI与电流内环准-比例谐振(QPR)串级的双环控制。利用过渡过程降低信号起始误差,实现超调降低、响应速率加快;通过频率特性分析,设计了适合系统的QPR控制器参数。通过Matlab/Simulink平台搭建仿真模型,对比分析双PI控制策略下装置的电压波动抑制和谐波治理效果。仿真结果表明,该控制策略对系统电压波动和电流畸变率具有更好的抑制效果,能有效提升系统运行稳定性和电能质量。
In this paper,the LCL coupled static synchronous compensator(STATCOM)is introduced to solve power quality problems such as voltage fluctuation and harmonic pollution caused by the distributed wind power connected to the power grid.In view of the particularity of nonlinear timevarying system and the improvement of device compensation performance,the dual-loop control of the LCL-type STATCOM is proposed based on the transition process of the coupling point voltage outer loop nonlinear PI and current inner loop quasiproportional resonance(QPR)cascade.The transition process is used to reduce the initial error of signal,reduce the overshoot and accelerate the response rate.Through the analysis of frequency characteristics,the parameters of the QPR controller suitable for the system are designed.In order to verify the effectiveness of the proposed control strategy,a simulation model is built through MATLAB/SIMULINK platform,and the voltage fluctuation suppression and harmonic control effects of the device under the dual-PI control strategy are compared and analyzed.The simulation results show that the control strategy has better suppression effect on the voltage fluctuation and current distortion rate of the system,and can effectively improve the stability and power quality of the system.
作者
蒋泽虔
陈卓
郝正航
刘建龙
陈湘萍
JIANG Zeqian;CHEN Zhuo;HAO Zhenghang;LIU Jianlong;CHEN Xiangping(School of Electrical Engineering,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《电网与清洁能源》
北大核心
2022年第2期102-109,共8页
Power System and Clean Energy
基金
国家自然科学基金项目(51867007)。
关键词
分布式风电
静止同步补偿器
电压外环控制
QPR内环控制
LCL滤波器
distributed wind power(DWG)
static synchronous compensator
voltage outer loop control
QPR inner loop control
LCL filter
