基于下垂控制的微电网变流器并网运行控制方法改进  

Improved grid-connection operation of microgrid converter based on droop control

作　　者：梁建钢[1] 金新民[1] 吴学智[1] 童亦斌[1] 

机构地区：[1]北京交通大学国家能源主动配电网技术研发中心.北京100044

出　　处：《电力自动化设备》2014年第4期59-65,共7页Electric Power Automation Equipment

基　　金：国家高技术研究发展计划(863计划)资助项目(2011-AA05A306)~~

摘　　要：基于下垂三环控制的微电网变流器并网运行时,电网电压存在的谐波分量将恶化微电网变流器输出电流。在不增加下垂三环控制环节的基础上,通过对传统控制方法中电压控制环的改进,提出一种简单有效地抑制微电网变流器输出电流谐波的方法。分析了传统下垂三环控制策略输出电流谐波产生的原理,将传统策略中电压调节器进行相应重组,在不影响基波输出阻抗的前提下增大微电网变流器对应谐波阻抗。分析了谐波调节环节谐振系数和截止角频率与抑制精度和抑制带宽的关系。仿真和实验结果表明,在相同电网谐波环境下改进方法能将微电网变流器对应输出谐波电流约降低至传统方法的15%,验证了该方法的正确性和可行性。When the grid-connection operation of microgrid converter is based on traditional droop control,its output current will be distorted by the harmonic components of grid voltage.The output current harmonics of microgrid converter based on traditional method are analyzed and it is proposed to simply improve its voltage control loop to effectively suppress the output current harmonics.The voltage regulators are regrouped to augment the output harmonic impedance of microgrid converter without affecting the fundamental impedance.The relationships between resonant coefficient and suppression effect and between cut-off frequency and suppression bandwidth are analyzed.Simulative and experimental results show that,the output harmonic current of microgrid converter is lowered to 15％,verifying the feasibility and correctness of the proposed improvement.

关 键 词：微电网 变流器 下垂控制 电压调节器 电流调节器 电压控制 谐波分析 

分 类 号：TM46[电气工程—电器]