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不同容量微源逆变器并联功率鲁棒控制 被引量:55

Robust Power Control of Paralleled Micro-source Inverters With Different Power Ratings
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摘要 微网不同容量逆变器按照比例精确分配负荷有功功率和无功功率的条件是等效输出阻抗与容量成反比,但实际中由于参数漂移、谐波注入和采集误差很难精确设计等效输出阻抗。以感性输出阻抗为例,分析等效输出阻抗对功率分配的影响机理及传统下垂控制法的局限。针对一种包含电压电流环的功率下垂控制器,通过重新设计等效输出阻抗,提出一种功率分配鲁棒控制方法,使无功功率分配不受输出阻抗变化的影响,并使等效输出阻抗幅频特性在工频内输出呈感性,高频内呈阻性以满足下垂方程及实现谐波抑制。仿真和实验证明并联运行的微源逆变器能按容量比精确分配负荷有功和无功,设计的控制器具备较强的鲁棒性能。 On the basis of the power distribution mechanism of multi-inverters in paralleled micro grids,it is proved that the condition for ideal sharing of loads is their equivalent output impedances of parallel-operated inverters should be in inverse proportion to their power ratings.But this condition is difficult to meet in practice.For a power droop control structure with a voltage-current loop,an improved power droop robust control method based on redesigning the reactive power control and the equivalent output impedance is proposed which is robust against the parameter drifts,design errors and the voltage drop.Simulations and experimental results show that the improved drooping controller can make the paralleled multi-inverters to share the load power by the ratio of rated capacity accurately.
作者 吕志鹏 罗安
出处 《中国电机工程学报》 EI CSCD 北大核心 2012年第12期35-42,共8页 Proceedings of the CSEE
基金 国家重点基础研究发展计划项目(973计划项目)(2009CB219706) 中国与欧洲政府间国际合作计划项目(2010DFA61640) 湖南省研究生科研创新项目(CX2011B130)~~
关键词 逆变器并联 下垂控制 微网 比例负荷分配 paralleled inverters droop control micro-grid proportional load sharing
作者简介 吕志鹏(1984-),男,博士研究生,研究方向为微网运行与控制,新能源并网与电能质量控制,配电网电气节能技术,lv_hnu@126.com 罗安(1957-),男,教授,博士生导师,研究方向为企业电气节能关键技术,谐波治理和无功补偿关键技术,微网及含微网配电网电能质量分析与控制。
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