光伏发电系统不对称故障功率控制

摘要

The the characteristics of instance output power of photovoltaic inverters is analyzed under unbalanced grid faults and the power control algorithm of photovoltaic generation is put forward based on the derivation of total harmonic distortion of instruction current. The optimal parameters model of photovoltaic generation is then established with minimum integrated fluctuation amplitude of the active and reactive power as a goal when the restriction of output current harmonic distortion of photovoltaic inverters is taken into account. Finally, the overall model of photovoltaic generation system based on deadbeat current tracking is realized and the feasibility of proposed control strategy is verified with PSCAD/EMTDC simulation software.%研究电网不对称故障下光伏逆变器的瞬时输出功率特性，结合指令电流的总谐波畸变率的解析推导，提出光伏发电的功率控制算法。考虑光伏逆变器输出电流谐波畸变率限值约束，以有功和无功功率波动的综合幅值最小为目标，建立光伏发电功率控制参数的优化模型。基于无差拍电流跟踪建立光伏发电系统整体模型，利用PSCAD/EMTDC仿真平台验证了该控制策略的可行性。