摘要
阐述了微电网孤岛运行时对逆变电源的要求,提出了一种基于同步发电机数学模型的逆变电源控制策略,并借鉴传统电力系统中频率及电压幅值控制方法,设计了微网系统的功率平衡及频率幅值控制方法。文中采用一次调频和二次调频实现负荷有功功率变化时所有微源间变化功率的合理分配,维持系统频率的稳定;电压调节器通过调节励磁电压,维持输出电压的稳定,实现无功功率的合理分配,最后,对孤岛运行模式下切/增负荷进行了仿真,证明了该理论的可行性。
This article introduced the requirements of the inverters in island and presented a new control strategy based on mechanical model of synchronous generator.By learning from the traditional control methods of power system frequency and voltage amplitude,the control methods of power balance and frequency amplitude in microgrid were designed.In the article,first and second frequency regulation realized a reasonable distribution of variational active power among all the microgrid sources when the power of load varied and maintained frequency stability.Voltage regulator maintained the stability of output voltage and achieved a reasonable distribution for reactive power by adjusting the excitation voltage.Finally,the feasibility of the theory in the paper has been demonstrated by simulating the load changes in islanded operation.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2011年第1期1-5,共5页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(50777015)
教育部科学技术研究重大项目(306004)
关键词
微网
虚拟同步发电机
频率调节
电压调节
功率平衡
microgrid
virtual synchronous generator
frequency regulation
voltage regulation
power balance
