多逆变器并网稳定性分析  

Analysis for stability of the grid-connected multi-inverter system

作　　者：何国锋[1] 朱更辉[1] 楚晓楠 韩耀飞[1] 兰奇逊[2] 张晓杰[1] 

机构地区：[1]河南城建学院电气与控制工程学院,河南平顶山467036 [2]河南城建学院数理学院,河南平顶山467036

出　　处：《可再生能源》2017年第3期389-394,共6页Renewable Energy Resources

基　　金：国家自然科学基金项目(61503122);河南省科技攻关计划项目(172102210179)

摘　　要：随着微网的快速发展,光伏渗透率逐渐增高。在多逆变器并网情况下,常采用电容电流反馈的虚拟阻尼方法来抑制谐振并网时产生的谐振。文章基于多台逆变器并网的闭环阻尼模型,分析了并网逆变器在硬件相同但软件参数不同情况下的多逆变器并网谐振阻尼特性,并采用传递函数闭环零极点的变化轨迹分析阻尼系数对多逆变器并网系统稳定性的影响。最后利用Matlab/simulink软件对所提出的控制策略进行了仿真,仿真结果表明,所提出的控制策略能保证系统的稳定性,并且有效地抑制并网谐振。With the rapid development of microgrid, the Photovoltaic （PV） permeability has been increasing gradually. Under the condition of paralleled multi-inverter, the control method by virtual damping is usually used to suppress the grid resonance. In order to analyze the stability of Multi-inverter parallel under the circumstance with the same hardware and different software parameters, the dynamic locus of closed-loop zero-poles is adopted to analyze the effect of damping coefficient on the multi-inverter grid system, which is based on the closed-loop damping mathematical model. Finally, Matlab/Simulink is adopted to verify the proposed control strategy. The simulation results show that the presented control strategy can effectively suppress the resonance among paralleled inverters, meanwhile can guarantee the system stability.

关 键 词：虚拟阻尼 并网谐振 闭环阻尼模型 电容电流反馈 闭环零极点 

分 类 号：TK51[动力工程及工程热物理—热能工程] TM46[电气工程—电器]