摘要
与传统的L滤波器相比,LCL滤波器在并网逆变器中对高次谐波抑制能力更强,体积与电感量更小,但其三阶滤波器存在谐振尖峰。为此,通过引入网侧电流修正量以增强逆变侧电流给定的方法消除谐振,并在此基础上分析了PWM控制由于加入了死区对逆变输出造成的影响,研究了死区补偿措施并增加了控制回路以补偿输出电压。最后通过仿真试验证明了控制策略的可行性。
Compared with L filter,LCL filter takes the advantage of the ability in suppressing higher order harmonics,smaller volume and less inductance in the use of inverter,but resonance spike exists in the three order filter LCL. Therefore,adding the grid-side current correction to strengthen the inverter-side current to it for resonance elimination. The influence caused by the dead-zone of the inverter output based on PWM control was analyzed,and the control loop was added to compensate the output voltage. Finally,the feasibility of the control strategy was proved by the simulation experiment.
出处
《电器与能效管理技术》
2016年第5期59-64,71,共7页
Electrical & Energy Management Technology
基金
国家自然科学基金(61463037)
江西省教育厅科技项目(GJJ14531)
江西省科技支撑计划(2010BGA01000)资助
关键词
并网逆变器
LCL滤波器
谐振抑制
死区补偿
grid connected inverter
LCL filter
resonance damping
dead-zone compensation
