摘要
目前学术界对并联电源的分析主要集中在均分功率控制技术上,而当电源容量各不相同时,均分功率可能使容量小的逆变器损坏,而容量大的却得不到充分利用。既影响并联系统安全稳定,又不能充分提高新能源的利用率,因此有必要对不同容量逆变器的无线并联展开研究。围绕下垂控制原理,对逆变电压幅值和频率进行动态分析,得出下垂控制参数的收敛临界值,同时推导出使公共负载功率按电源容量比例分配的充分条件。幅值收敛条件是有功下垂系数应该小于收敛临界值,而其频率收敛条件是无功下垂系数应小于收敛临界值,最后通过仿真和实验证明了理论分析的正确性。
At present, the analysis of parallel power is mainly concentrated on the control technology of equal power, and when the power capacity is not the same, the power sharing may damage the inverter with small capacity, hut the capacity is not sufficient use.Which affects the security and stability of the parallel system, and can not fully improve the utilization of new energy.Therefore, it is necessary to study the wireless parallel connection of different capacity inverters.Based on droop control principle ,the amplitude and frequency of inverter voltage are analyzed dynamically, and the convergence critical value of droop control parameter is obtained.At the same time, sufficient conditions are derived to distribute the power of public load according to power capacity ratio.Amplitude convergence condition is that the active sag coefficient should be less than the convergence critical value,and the frequency convergence condition is that the sag coefficient of reactive power should be less than the convergence threshold value.Finally,the correctness of theoretical analysis is proved by simulation and experiment.
出处
《电力电子技术》
CSCD
北大核心
2017年第11期114-116,共3页
Power Electronics
基金
国家自然科学基金(61463037)~~
关键词
逆变器
下垂控制
收敛条件
inverter
droop control
convergence condition
