高效率微型光伏并网逆变器控制策略研究  

Control strategy of high efficiency grid-connected photovoltaic micro-inverter

作　　者：吴春华[1] 黄建明[1] 杨宇[1] 

机构地区：[1]上海大学自动化系,上海市电站自动化技术重点实验室,上海200072

出　　处：《电力系统保护与控制》2012年第20期106-112,共7页Power System Protection and Control

基　　金：国家自然科学基金项目(51107079);上海市优秀青年教师科研专项基金(shu09019);上海大学'十一五'211建设项目~~

摘　　要：在充分考虑微型光伏并网逆变器系统效率、成本、电能质量等方面的基础上,研究了利用反激逆变器准谐振模式实现功率管ZVS动作及电流型并网的控制策略,深入分析了准谐振模式的谐波问题,提出了一种优化正弦波控制方法,达到高电能质量、高效率光伏并网发电。提出了一种微型光伏并网逆变器弱光照间歇模式控制策略,可以有效提高较低光照强度时系统效率。为了提高光伏组件在间歇模式时MPPT跟踪效率,进一步提出利用间歇模式的母线电压波动进行最大功率点跟踪的控制方法,使得在间歇模式时不需要加入额外的扰动也能进行最大功率点跟踪,提高MPPT跟踪精度。最后,通过搭建实验平台对并网电流谐波、系统效率、间歇模式控制、间歇模式MPPT等进行了验证,实验结果证明了所提出的控制策略的可行性及有效性。An optimized sine-wave control method based on grid-connected photovoltaic micro-inverter is proposed and high efficiency, small volume and low harmonious micro-inverter is achieved. Furthermore harmonic issues under quasi-resonant ZVS mode with flybaek inverter and current source grid-connected are analyzed in depth to realize grid-connected power generation with high efficiency and high quality energy. A burst mode control method used in grid-connected photovoltaic micro-inverter when the power of PV cell is relatively low is proposed. The efficiency of micro-inverter can be significantly increased due to burst mode control. The burst mode will cause a voltage ripple in the PV cell, and thanks to this ripple, a novel MPPT method can be achieved, which does not need additional disturbance, Finally, the grid-connected current harmonic, system efficiency, burst mode control, and MPPT in burst mode is verfied on the experimental platform, the validity and feasibility of the proposed control strategy is proved by experimental results.

关 键 词：微型逆变器 并网控制 间歇模式 准谐振模式 

分 类 号：TM464[电气工程—电器]