摘要
针对主从控制下的微网并网/孤岛运行模式切换问题,设计了综合功率控制、幅值控制与相位控制的微网模式控制系统。给出了主动离网的负载转移策略,降低了该过程对主控单元的冲击;提出了一种无锁相环的相位控制方法,与传统方法相比,其结构简单,实现了孤岛微网并网前的预同步,而且确保了运行模式切换前后频率和相位的连续。最后,建立了微网系统仿真平台,对被动离网、主动离网以及孤岛转并网的暂态过程进行分析,验证了所提策略的正确性。
A microgrid mode control system including power control, amplitude control and phase control was designed for smooth switch between grid-connected and islanded microgrid modes with master-slave control. A load transfer strategy on active isolating was introduced to reduce impact on master control. A novel phase control method without PLL was proposed. Compared to conventional method, the proposed method with simple structure not only achieved pre-synchronization control of islanded microgrid to main grid, but also ensured frequency stability and phase continuity during control mode transition. A simulation platform of a microgrid was established, and transients of passive isolating, active isolating and transition from islanded to grid-connected mode were analyzed. It verified validity and superiority of the proposed control strategy.
出处
《电网技术》
EI
CSCD
北大核心
2016年第4期1155-1162,共8页
Power System Technology
基金
福建省中青年教师教育科研项目(JA15071)
福建省中青年教师教育科研项目(JA14064)
福州大学科技发展基金资助项目(650046)资助
关键词
微网
相位控制
并网模式
孤岛模式
平滑切换
microgrid
phase control
grid-connected mode
islanded mode
smooth switch
