采用交错并联技术的电动三轮车光伏充电控制系统

Photovoltaic Charging Control System for Electric Tricycle by Interleaving Parallel Technology

利用太阳能对电动三轮车充电具有较大的应用价值。该文采用扰动观察法和交错并联技术,为电动三轮车设计一种Boost升压变换充电系统。对电动三轮车锂电池采用恒流–恒压充电方式。设计双相交错并联Boost升压电路及其充电算法,仿真表明设计的充电算法有较好的稳定性。对电动三轮车锂电池恒流充电阶段的扰动观察法算法进行仿真,表明在相同扰动步长下,交错并联Boost升压电路具有较低的光伏电池输出电流纹波及输出功率振荡。室内测试表明,在恒压限流充电算法下,设计的充电系统具有较好的输出特性。对光伏电动三轮车进行户外充电测试,表明在恒流充电阶段,光伏电池始终工作在30V左右的最大功率点电压处;在正常负载情况下,充电效率达到95%以上。

Charging for electric tricycle by solar energy has high engineering values. Based on the perturb-and-observe algorithm（PO algorithm） and interleaving parallel technology, this article designed a step-up boost converter for electric tricycle. The charging method for lithium battery of electric tricycle is constant-current and constant-voltage. A two-parallel interleaved Boost booster circuit and its charging algorithm were completed and simulated, whose simulation discloses that the system is stable. In the constant-current charging phase of lithium battery, the photovoltaic PO algorithm simulation shows that under the same disturbance step, the converter has lower current output ripple and power output oscillation for photovoltaic battery. The indoor charging result shows that under the constant-voltage limitary-current charging algorithm, the converter has better output properties. The outdoor charging result shows that in the constant-current charging stage, the photovoltaic panel always works around 30 V for the maximum power point. Furthermore, its charging efficiency can be above 95% in most load ranges.