集成谐波阻尼功能的单相光伏发电系统

针对单相LC型并网逆变器与电网阻抗间可能发生的谐振现象进行了研究。为了提高公共连接点电压质量，抑制背景谐波电压在公共连接点的谐振放大，将阻性有源滤波器的功能引入光伏并网逆变器。集成谐波阻尼功能的单相光伏并网系统可有效抑制背景谐波电压的谐振放大，但交直流侧瞬时功率交换会导致直流侧电压出现高频纹波分量脉动。为此，通过引入低通滤波环节和优化电压电流环参数设计，达到了减少直流侧电压纹波对电流环控制影响的目的。理论分析和仿真结果验证该方案的有效性。

Single Phase Photovoltaic System with Integrated Harmonic Voltage Damping Function

It studied the resonance phenomenon between single-phase grid-connected inverter with LC filter and grid impedance. In order to improve voltage quality of common connection points and suppress harmonic resonance amplification of background harmonic voltage, function of resistive active filter was integrated into grid-connected inverter. Single phase photovoltaic system with integrated harmonic voltage damping function can suppress resonant amplification of background harmonic voltage effectively, but instantaneous power exchange between AC and DC side will cause high-frequency component ripple of DC voltage. Therefore, to reduce the effect on the current of DC voltage ripple, a strategy was proposed based on low-pass-filter and parameter optimization design of voltage and current loop. Both theoretical analysis and simulation results demonstrate that this control strategy is valid.