摘要
Z源中点钳位式(NPC)三电平变换器把逆变和升压两种环节结合在一起,结构简单、工作效率高,但是针对这种结构输出的无功功率研究较少。提出了一种Z源NPC三电平变换器的恒功率并网控制策略。首先对这种变换器的结构及原理进行分析;再把恒功率控制引入到这种变换器的并网控制中,并采用空间矢量脉宽调制(SVPWM)实现了变换器的并网控制。MATLAB/Simulink软件仿真结果证明了这种变换器能够提高电压升压比。该控制策略可使变换器输出的有功功率、无功功率稳定于设定值,且并网电流谐波较低。
Single stage Z-source three-level neutral point clamped (NPC) inverter combines voltage-boost and inversion functions,and it has the advantages of simple structure and high efficiency.A constant power grid-connected control method for Z-source NPC three-level inverter based on space vector pulse width modulation (SVPWM) was proposed.First,the structure and working principle of Z-source three-level NPC inverter was analyzed.Then,the constant power control strategy was introduced to Z-source three-level NPC inverter grid-connected system.Finally,simulation model of the system was built in MATLAB/Simulink software.The simulation results showed that Z- source NPC three-level inverter could boost the step-up ratio, this control method could made the output active and reactive power of the grid inverter track the set value effectively,and grid current harmonic content components were low.
作者
程启明
沈磊
程尹曼
魏霖
王玉娇
CHENG Qiming;SHEN Lei;CHENG Yinman;WEI Lin;WANG Yujiao(College of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China;North Power Supply Branch,Shanghai Electric Power Company,Shanghai 200041,China;College of Electronics and Information Engineering,Tongji University,Shanghai 201804,China)
出处
《电机与控制应用》
2019年第2期25-31,共7页
Electric machines & control application
基金
国家自然科学基金项目(61304134)
上海市电站自动化技术重点实验室项目(13DZ2273800)
关键词
Z源变换器
中点钳位式
三电平逆变器
恒功率控制
空间矢量脉宽调制
Z-source inverter
neutral point clamped
three-level inverter
constant power control
space vector pulse width modulation (SVPWM)
