基于模型预测控制的大型水力发电厂降压型整流器直流输出纹波抑制策略  

DC Output Ripple Suppression Strategy for Step-down Rectifier in Large-scale Hydropower Plants based on Model Predictive Control

作　　者：程福泉 张烨 丁进伟[1] 刘薇 肖迪文 CHENG Fuquan;ZHANG Ye;DING Jinwei;LIU Wei;XIAO Diwen(Xiluodu Hydropower Plant,China Yangtze Power Co.,Ltd.,Zhaotong 657300,China)

机构地区：[1]中国长江电力股份有限公司溪洛渡电厂,云南昭通657300

出　　处：《水电与新能源》2024年第11期66-71,共6页Hydropower and New Energy

摘　　要：针对大型水力发电厂直流系统中降压型整流器直流输出纹波大,在两相静止坐标系下建立降压型整流器数学模型和状态空间方程,根据状态空间方程设计代价函数,约束网侧电流令其紧密跟踪参考电流。考虑MPC计算时间对系统预测精度的影响,采用了两步预测进行延迟补偿,为抑制降压型整流器交流侧LC谐振,采用阻感串联无源阻尼方案抑制谐振。最后,通过MATLAB/Simulink仿真验证了该控制策略的有效性。The DC output ripple of the step-down rectifier in the DC system of a large-scale hydropower plant is excessively large.To address this problem,the mathematical model and state space equation of the step-down rectifier in the two-phase stationary coordinate system are established.The cost function is designed based on the state space equation,and the grid-side current is constrained to closely track the reference current.Considering the influence of the MPC calculation time on the prediction accuracy of the system,a two-step prediction method is adopted for delay compensation.To suppress the LC resonance on the AC side of the rectifier,a resistance inductance series connection passive damping scheme is used.At last,the effectiveness of the proposed control strategy is verified with MATLAB/Simulink simulations.

关 键 词：降压型整流器 模型预测 有源阻尼 代价函数 LC谐振 

分 类 号：TM461[电气工程—电器]