摘要
该文对以柴油发电机组(diesel generator set,DGS)为主源的独立微电网中带有储能单元的变流器控制策略进行研究。变流器采用虚拟同步机(virtual synchronous generator,VSG)控制算法,有功功率指令值由频率控制模块和荷电状态(state of charge,SOC)控制模块两部分组成,并引入自适应权重系数以协调上述两种控制的分配比例。当储能SOC越接近预设值时,增加频率控制占比,提高VSG对微网频率波动的抑制能力,反之当SOC越偏离预设值时则增加SOC控制占比,提高维持SOC的能力,避免储能装置过充或过放。通过建立小信号模型从稳定性和动态响应两方面确定了权重系数的取值范围,最后搭建100k W独立微电网平台,通过仿真和试验验证了提出策略的有效性。
A control strategy for converters with energy storage units in islanded microgrids using diesel generator sets（DGS） as the main source was presented. The converter uses virtual synchronous generator（VSG） control algorithm, the active power reference consists of a frequency control module and a state of charge（SOC） control module. An adaptive weight factor was introduced to coordinate the proportion of the two modules. When the SOC of energy storage is closed to the SOC reference, the proportion of SOC is increased and the frequency of microgrid fluctuation is restrained, whereas when SOC goes far away from the SOC reference, the SOC control proportion is increased to enhance the ability of maintaining the SOC of energy storage. The value range of the weight factor was established by analyzing the stability of dynamic response of the small signal model of systems. Finally the proposed strategy was validated with a 100 k VA islanded mircogrid system.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第2期516-524,共9页
Proceedings of the CSEE
关键词
虚拟同步机
微电网
荷电状态
自适应权重系数
virtual synchronous generator（VSG）
microgrid
state of charge
adaptive weight factor
