摘要
单相并网逆变装置的性能主要取决于其控制技术,传统的并网电流瞬时值单环PI控制虽然能够获得快速的动态性能,但不能保证输出电流幅值的精度且系统会受电网电压影响。针对以上问题,本文提出了并网电流平均值外环和瞬时值内环的双环控制策略,提高了系统的精度,并在内环加入电网电压前馈环节,消除了电网电压的干扰。通过仿真实验和样机对比实验证明了所提方案的有效性。
The performance of the single phase grid-connected inverter depends mainly on its control technique.The traditional single-loop PI control of instantaneous value of grid current can make the system to gain fast dynamic performance,but is not capable to obtain high amplitude accuracy of the output current and the system will be interfered with by the grid voltage.To solve the above problems,a double-loop strategy of the mean value and instantaneous value of grid-current is proposed in this paper.The inner loop of the instantaneous value makes the output current of the inverter tracking the sinusoidal reference current quickly,while the outer loop of the mean value makes the amplitude of the output current equal to the one of the reference.So the solution proposed in this paper can help to obtain high accuracy and to offset the impact of the grid voltage with its the feed forward loop.The simulation and prototype experiments had verified that the proposal is effective.
出处
《电工电能新技术》
CSCD
北大核心
2012年第2期56-59,共4页
Advanced Technology of Electrical Engineering and Energy
基金
广东省教育部产学研结合项目(2009B090300424)
广东省科技计划项目(2010A010200004)
2010年粤港关键领域重点突破招标项目“风光互补分布式发电并网控制系统关键技术及产业化”(20100107-3)
关键词
并网逆变
电流控制
双环控制
平均值外环
电网电压前馈
grid-connected inverter
current control
double-loop control
outer loop of mean value
feed forward of grid voltage
