摘要
针对级联H桥光伏并网逆变器各级联单元输出功率不均衡的问题,提出了一种基于功率加权的级联H桥光伏并网逆变器功率均衡控制策略。由各单元直流侧功率和各级联单元参考电压,得出功率权重因数,电流内环输出的占空比信号基于功率权重因数被重新分配给级联单元,修改各级联单元占空比信号。该策略能够保证各级联单元的输出功率均衡,且实现了电流环和电压环的近似解耦,简化了控制器的设计。最后通过仿真研究验证了该控制策略的正确性和有效性。
Considering the problem of unbalanced output power from different cascaded units in a cascaded H-bridge photovoltaic(PV)grid-connected inverter,a power balanced control strategy is proposed for the inverter based on pow.er-weighting.The power weight factor is obtained by the power and the DC side reference voltage of each unit,and the duty cycle signal output by the current inner loop is reallocated to the cascade unit based on the power weight factor,and the duty ratio signal of each unit is modified.This strategy can guarantee the balanced output power from each cas.caded unit,realize approximate decoupling of current loop and voltage loop,and simplify the design of the controller.At last,the correctness and effectiveness of the proposed control strategy are verified by simulations.
作者
叶满园
潘涛
YE Manyuan;PAN Tao(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)
出处
《电力系统及其自动化学报》
CSCD
北大核心
2018年第10期49-54,83,共7页
Proceedings of the CSU-EPSA
基金
国家自然科学基金资助项目(51767007)
江西省教育厅自然科学基金资助项目(GJJ160495)
关键词
功率加权
级联型H桥并网逆变器
功率均衡控制
独立最大功率点跟踪
光伏
power-weighting
cascaded H-bridge grid-connected inverter
power balanced control
independent maximum power point tracking(MPPT)
photovoltaic(PV)
