摘要
为抑制单相qZSI直流侧二次谐波电流,提出一种基于虚拟阻抗的二次谐波电流抑制策略。该控制策略通过引入串联虚拟阻抗附加控制以提高单相qZSI在2f_(0)处的闭环输出阻抗,用以有效抑制直流侧的二次谐波电流。同时,综合考虑二次谐波电流抑制要求以及保证系统稳定裕度等约束条件,提出该控制策略的闭环参数设计方法。最后通过数字仿真和基于RT-LAB的硬件在环仿真验证了所提二次谐波电流抑制策略以及其闭环参数设计方法的正确性。
The second harmonic current in the DC link of single-phase quasi-Z-source inverter(qZSI)seriously affects the performance of the system and limits its application.Aiming at suppressing the second harmonic current at the DC side of single-phase qZSI,a new strategy based on virtual impedance is proposed.The control strategy increases the closed-loop output impedance of single-phase qZSI at 2f_(0)by introducing an additional control process of the serial virtual impedance to effectively reduce the second harmonic current contents at the DC side.At the same time,a closed-loop parameter design method of the control strategy is proposed considering the constraints of the second harmonic current suppression requirement and the stability margin of the system.Finally,the correctness of the second harmonic current suppression strategy and its closed-loop parameter design method proposed in this paper are verified by digital simulation and RT-LAB based hardware-in-the-loop simulation.
作者
刘欣
高鑫波
袁静
Liu Xin;Gao Xinbo;Yuan Jing(Department of Electrical Engineering,North China Electric Power University(Baoding),Baoding 071003,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2024年第6期349-358,共10页
Acta Energiae Solaris Sinica
关键词
光伏发电
准Z源
逆变器
谐波分析
虚拟阻抗
pv power generation
quasi-Z source
inverter
harmonic analysis
virtual impedance
