光伏并网逆变器的阻抗重塑与谐波谐振抑制

发布时间：2019-07-13 19:48

【摘要】：针对并网逆变器的输出阻抗重塑控制,及其在抑制分布式光伏发电系统谐波谐振中的应用进行研究。首先,以一个典型的分布式光伏并网发电系统为例,分单台并网逆变器和多台并网逆变器两种情况,定量分析系统内串并联谐波谐振的机理及其影响因素。其次,提出一种能重塑光伏并网逆变器高频输出阻抗的控制策略。利用基于二阶广义积分器的陷波器滤除并网电压/电流基波分量后,经过输出阻抗控制后反馈到其指令电流(或调制信号)中,从而重塑并网逆变器的输出阻抗。当重塑后的阻抗呈现足够大的阻性时,可有效抑制网络内的高频谐波谐振。最后,利用PSCAD/EMTDC的仿真结果和一个微电网的实验结果验证所提控制策略的正确性和有效性。
[Abstract]:The output impedance reshaping control of grid-connected inverter and its application in suppressing harmonic resonance of distributed photovoltaic power generation system are studied. Firstly, taking a typical distributed photovoltaic grid-connected power generation system as an example, the mechanism of series-parallel harmonic resonance in the system and its influencing factors are quantitatively analyzed in the case of single grid-connected inverter and multiple grid-connected inverter. Secondly, a control strategy which can reshape the high frequency output impedance of photovoltaic grid-connected inverter is proposed. After filtering the grid-connected voltage / current fundamental components by using the notch filter based on the second-order generalized Integrator, the output impedance of the grid-connected inverter is reshaped after the output impedance is controlled and fed back into its instruction current (or modulation signal). When the remolded impedance is large enough, the high frequency harmonic resonance in the network can be effectively suppressed. Finally, the correctness and effectiveness of the proposed control strategy are verified by the simulation results of PSCAD/EMTDC and the experimental results of a microgrid.
【作者单位】：浙江大学电气工程学院;中国电力科学研究院;
【基金】：国家863高技术基金项目(2011AA050204) 国家自然科学基金项目(50907060)~~
【分类号】：TM464

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