不平衡电网条件下的三相光伏逆变器并网控制策略研究
首发时间:2016-06-01
摘要:不平衡电网电压下并网电流和功率质量是光伏并网逆变器重要的性能指标。本文首先分析不平衡电网电压情况下正负序产生机理,给出基于二阶广义积分器Second Order Generalized Integrator(SOGI)的正负序分离方案,完成正负序电压分离,并结合三相不平衡电网情况下系统控制策略,生成两相静止坐标系下的电流参考值。采用准比例谐振(准PR)控制器,改善微电网电压的不平衡度并实现正弦量的无静差跟踪。最后,给出仿真结果以验证提出方法的可行性和有效性。
关键词: 不平衡电网电压 光伏并网逆变器 正负序电压 二阶广义积分器 准PR控制器
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Control strategy analysis on grid connected of three phase photovoltaic inverter under unbalanced grid
Abstract:The grid current and power quality under unbalanced grid voltage are the key performance indicators of photovoltaic inverter. This paper analyzes thegeneration mechanism of positive and negative sequence under unbalanced grid voltagesituation, proposes the positive and negative sequence separation scheme based on second order generalized integrator (SOGI) to complete separation of positive and negative sequence voltage. It generates a current reference value under two-phase stationary coordinate system with the control strategy of three-phase unbalanced power grid system. We use quasi proportional resonant controllerto improve the micro-grid voltage imbalance and achieve zero static error tracking the sinusoid. Finally, we give the simulation result on unbalanced grid voltage grid whichverifies the feasibility and effectiveness of the proposed method.
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