【摘要】 直流分量抑制是非隔离型光伏并网逆变系统的关键技术之一,国际并网认证标准中普遍要求光伏并网逆变器注入电网的直流分量不可超过额定电流的0.5%。文章在分析无差拍并网控制策略的基础上,通过对电压指令校正及电流指令校正两种控制方法的直流分量抑制效果进行对比,采用一种简单有效的直流分量检测及零点校正方法进行直流分量抑制。对3 kW单相非隔离型光伏并网逆变器进行相关试验,结果证明了控制算法的有效性。更多还原

【Abstract】 DC component suppression is one of key technologies of non-isolated grid-connected photovoltaic inverter system.It’s required generally that the DC component injected to grid by grid-connected photovoltaic inverter shall not exceed 0.5% of the rated current in the international grid-connected certification standards.Base on the analysis of dead-beat control strategy,the effects of voltage instruction adjustment and current instruction adjustment for DC component suppression are compared.A simple and effective DC component detect method with zero correction is adopted.Relative experiments were carried out on a 3kW single phase non-isolated grid-connected photovoltaic inverter.The theoretical analysis and experiment results verify the effectiveness of the control algorithm.更多还原