Z源型三电平九开关光伏并网逆变器研究
摘要：研究了一种Z源型三电平九开关变换器拓扑结构,并将其应用于光伏逆变系统,在改善单极型逆变器对光伏电池输出电压波动适应能力的同时,提高了输出电能质量。在对三电平九开关变换器和Z源升压网络建模分析的基础上,确定主电路拓扑结构。在传统SVPWM调制的基础上,比例压缩原SVPWM脉冲作用时间,将剩余时间用于产生直通脉冲,实现两种驱动信号的交叉调制。以功率控制和升压控制为目标,设计Z源三电平九开关光伏逆变器的控制策略。仿真分析表明:光照强度变化引起光伏电池输出电压波动时,Z源升压网络维持逆变器正常工作;三电平结构使得输出电流谐波总畸变率(THD)低。
Abstract:A topology of Z-source three-level nine-switch converter is studied, and is applied in PV inverter system, which enhances the adaptability of single-polar inverter to voltage fluctuation of PV unit and improves the power quality. Based on the modeling of the three-level nine-switch converter and the Z-source boost network, the topology of the main circuit is designed. On the basis of traditional SVPWM modulation, a method to proportionally compress pulse effect time of original SVPWM is presented, and the spare time is used to direct pulse modulation to realize joint regulation of both driving signals. Taking the power control and voltage control as objective, the control scheme of the proposed converter is designed. The simulation result shows that Z-source network maintains the normal operation of inverter when PV output voltage fluctuates with the varying of irradiation, and the three-level structure makes the output current total harmonic distortion (THD) low.
标题：Z源型三电平九开关光伏并网逆变器研究
英文标题：Research of Z-source Three-level Nine-switch Inverter for Photovoltaic Generation System
作者：胡志帅, 任永峰, 韩俊飞, 从旭光, 张佳羽,
关键词：Z源网络, 三电平九开关变换器, 光伏逆变器, SVPWM,
发表日期：2017-10-09
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