摘要
提出了一种用于光伏-蓄电池联合供电水泵系统的Buck＋开关电感Buck-Boost集成式单管DC/DC变换器,分析了该变换器在不同工作模式下的输出电压调节能力;探讨了前级电路采用脉冲频率调制（pulse-frequency-modulation,PFM）控制且工作在恒压充电模式下时太阳能电池的稳定工作区;提出了基于PFM控制的最大功率点跟踪（maximum power point tracking,MPPT）和蓄电池恒压充电双模式自由切换控制策略;给出了电感参数设计准则,以确保系统在整个光照、温度和负载变化范围内均正常工作;最后通过24 W样机进行了实验验证。研究结果表明,该集成式变换器具有结构简单、输出电压调节范围宽、效率和可靠性高等优点。
This paper proposes an single-switch DC/DC converter for photovoltaic（PV）-battery-powered water pump system. It is an integration of a classical buck converter and a switched-inductor buck-boost converter to share power switch. Stable operation region of solar cells is also studied when the front-end circuit is controlled with pulse-frequency-modulation（PFM） for battery voltage regulation（BVR）. Based on this, the control strategy for the front-end circuit under PFM smoothly switching between maximum power point tracking（MPPT） mode and BVR mode is proposed. Then, inductance design criterion is given to ensure the PV-battery-power pump system work reliably throughout entire operation range. A 24 W prototype is implemented to verify theoretical analysis. The investigation shows that the integrated converter has advantages of simple structure, wide voltage output range, high efficiency and reliability.
出处
《电网技术》
EI
CSCD
北大核心
2018年第1期210-219,共10页
Power System Technology
基金
国家自然科学基金项目(51207075、51607098)
南通市应用基础研究项目(GY12015007)~~
