广东电力2016，Vol.29Issue(4)：22-28,7.DOI:10.3969/j.issn.1007-290X.2016.04.004
基于下垂控制的微网无缝切换控制策略研究
Research on Seamless Transfer Control Strategy for Micro-grid Based on Droop Control
摘要
Abstract
When the micro-grid based on droop control is in off-grid running,output voltage frequency and amplitude is ad-justed for distributed generation (DG)according to local active load,reactive load and its droop characteristic,which may realize stable operation of the micro-grid and reasonable distribution of active and reactive loads.But droop control may cause no longer inconsistence of voltage phase and amplitudes at two sides of the grid-connected point of micro-grid.And when the micro-grid transfers to grid-connection running,larger power impact may be caused in an instant of grid-connec-tion if no control is performed which may directly affect power energy quality and stabile operation of the micro-grid. Therefore,this paper proposes a kind of seamless transfer control strategy based on droop control for the micro-grid which makes use of characteristic of voltage control mode in the bottom of DG being fixed to realize smooth switch of micro-grid from grid-connection running to off-grid running.By means of recovery control on second-level voltage frequency and im-proved phase control,power impact in an instant of transfer from off-grid running to grid-connection running of the micro-grid is greatly reduced.Electric magnetic transient in DC system and power system computer aided design (EMTDC/PSCAD)software is used for simulating calculation and it is verified validity of this control strategy.关键词
可再生能源/分布式发电/下垂控制/无缝切换/改进相位控制Key words
renewable energy/distributed generation/droop control/seamless transfer/improved phase control分类
信息技术与安全科学引用本文复制引用
张野,郭力..基于下垂控制的微网无缝切换控制策略研究[J].广东电力,2016,29(4):22-28,7.基金项目
南方电网科学研究院有限责任公司青年创新基金资助。 （）
