摘要
为了实现并网时直流负荷在各个接口变换器之间功率的均匀分配,提高直流母线电压质量,采用了分层控制对接口变换器进行控制。第一层控制采用直流电压-有功功率耦合的下垂控制方法,实现了负荷均匀分配;第二层控制针对下垂控制可能导致的直流母线电压跌落,采用补偿直流母线电压参考值的方法,恢复母线电压的稳定,保证了直流母线电压的质量。通过根轨迹法对控制方法进行了分析,并利用DIg SILENT仿真软件搭建微电网模型,仿真结果验证了控制策略的正确性。
In order to realize the uniform distribution of DC power among interlinking converters and improve the DC voltage quality, a hierarchical control strategy for the interlinking converters was introduced. The first layer of the control strategy is that the voltage-power droop control method is used, which can realize the uniform load distribution. Because the droop control may lead to fall of the DC bus voltage, the DC voltage reference value is compensated according to the second layer control method ,which can recover the stability of the bus voltage and ensure the quality of the DC voltage. This control strategy was analyzed by the root locus method. The microgrid model was built based on the simulation software DIgSILENT, and simulation results verify the validity of the strategy.
出处
《电器与能效管理技术》
2015年第2期56-60,69,共6页
Electrical & Energy Management Technology
基金
国家高技术研究发展计划(863计划)(2011AA05A107)
关键词
微电网
接口变换器
下垂控制
根轨迹
均匀分配
micro grid
interlinking converter
droop control
root locus
uniform distribution
