基于滑窗DFT的海上光伏发电并网逆变器电流控制方法  

Current Control Method of Offshore Photovoltaic Grid-connected Inverter Based on Sliding Window DFT

作　　者：陶蕾 王英林 付佳宇 Tao Lei;Wang Yinglin;Fu Jiayu(North China Power Engineering Co.,Ltd.,China Power Engineering Consulting Group,Beijing 100120,China)

机构地区：[1]中国电力工程顾问集团华北电力设计院有限公司,北京100120

出　　处：《机电工程技术》2023年第10期224-226,252,共4页Mechanical & Electrical Engineering Technology

摘　　要：常规的逆变器电流控制方法主要是将逆变器电流进行重构,但是快速反应会导致电流参考值会出现大幅度变化,导致电流控制效果不佳。因此,设计了基于滑窗DFT的海上光伏发电并网逆变器电流控制方法。确定海上光伏并网逆变器电流控制参数,将电流波动畸变控制在允许范围内。基于滑窗DFT消除光伏发电并网逆变电流谐波,对不适合的瞬时谐波进行检测,构建了逆变器电流有源阻尼控制模型,消除连续域内的不稳定极点,保证负载电流的控制能力,从而稳定离散域的电流,实现发电并网逆变电流的有效控制。通过仿真实验验证了提出的基于滑窗DFT的海上光伏发电并网逆变器电流控制方法,将逆变器电流进行闭环控制,在消除电流谐波的基础上,减弱逆变器的稳态偏差,控制的电流与标准电流基本保持一致,能够实现电流的有效控制。The conventional inverter current control method mainly reconstructs the inverter current,but rapid response can lead to significant changes in the current reference value,resulting in poor current control effect.Therefore,a current control method for offshore photovoltaic power grid connected inverter based on sliding window DFT is designed.The current control parameters of the offshore photovoltaic grid connected inverter are determined and the current fluctuation and distortion is controlled within the allowable range.Based on sliding window DFT,the harmonics of photovoltaic grid connected inverter current is eliminated and inappropriate instantaneous harmonics is detected,an active damping control model for inverter current is constructed to eliminate unstable poles in the continuous domain and ensure the control ability of load current,thereby stabilizing the power flow in the discrete domain and achieving effective control of grid connected inverter current.Through simulation experiment,the proposed current control method for offshore photovoltaic power grid connected inverters based on sliding window DFT is verified.The inverter current is controlled in a closed-loop manner,which reduces the steady-state deviation of the inverter based on eliminating current harmonics.The controlled current is basically consistent with the standard current,and can achieve effective current control.

关 键 词：滑窗DFT 海上光伏发电 发电并网 逆变器 电流控制方法 有源阻尼控制模型 

分 类 号：TM464[电气工程—电器]