单载波调制单相三电平不对称光伏并网逆变器  

Single Carrier Based Single-phase 3-level Asymmetric PV Grid-connected Inverter

作　　者：金渊[1] 曾爽[1] 刘秀兰[1] 关宇[1] 迟忠军 李香龙[1] 

机构地区：[1]国网北京市电力公司电力科学研究院,北京100075

出　　处：《科学技术与工程》2016年第20期180-185,共6页Science Technology and Engineering

摘　　要：介绍了一种适用于小功率光伏并网发电系统的单相三电平不对称逆变器。针对三电平电路正弦脉宽调制(sinusoidal pulse width modulation,SPWM)使用过多三角波层叠、占用系统资源多的问题,基于数字信号处理器(digital signal processing,DSP)给出了一种只使用一个载波的改进型SPWM实现方式。引入了一种空间矢量脉宽调制(space vector pulse width modulation,SVPWM)方式,分析了上述两种方法的一致性和优缺点。在并网控制中采用了一种改进型的比例谐振控制器(proportional-resonant,PR),相对于理想PR控制器,具有受电网频率波动和数字系统离散化影响小的优点。通过仿真和搭建小功率试验台的方法,验证了控制策略和调制方式的可行性。A single-phase 3-level asymmetric inverter is introduced,which is able to use in low power PV gridconnected system. In order to solve the problem that multilevel sinusoidal pulse width modulation( SPWM) method excessive uses of the triangular waves,take up to much system resources,a new single carrier SPWM method based Digital Signal Processor( DSP) can be implemented efficient for the inverter. A space vector pulse width modulation( SVPWM) technique is introduced,which have the same effect and different usefulness with SPWM. A new proportional-resonant( PR) controllers are implemented in grid-connected control system. This controllers are insensitive to frequency variations and easy to implement on DSP. To verify the feasibility of the system,a simulation model and a low power inverter was constructed and results are provided.

关 键 词：光伏发电 三电平 SPWM调制 比例谐振控制 

分 类 号：TM464[电气工程—电器]