新型无均衡管理光伏锂电储能发电模组及其MPPT控制策略

为解决既有基于锂电无均衡管理(NBCM)的光伏锂电储能发电模组存在的光伏电池面板与锂电池之间需要严格的电压匹配及其带来的能效损失问题,改善光伏电池面板串级阴影效应以及功率变换器高频开关耦合产生的对地漏电流效应,提出一种改进的NBCM光伏锂电储能发电模组拓扑结构,其控制单元由前级光伏电池自适应电压均衡单元和后级SEPIC馈电升降压(SFBB)变换单元构成。在此基础上,提出一种基于极值搜索控制(ESC)和Lyapunov开关耦合控制的2-Lyap ESC最大功率点跟踪(MPPT)控制策略,以提高NBCM光伏锂电储能发电模组内串联光伏电池模块的MPPT输出能效,优化模组能量管理。仿真结果验证了该拓扑及MPPT控制策略的有效性。

PV/Li-ion energy-storage power module based on non-balancing cell management and its MPPT control

Aiming at the energy-efficiency loss due to the strict voltage matching between PV(PhotoVoltaic) panel and Li-ion battery cell, the shadow effect of serial PV cells and the earth leakage effect induced by the high switching-frequency coupling of power converter, a modified topology of NBCM (Non-Balancing Cell Management)-based PV/Li-ion energy-storage power module is proposed. Its control section is composed of a first-stage PV cell adaptive voltage balancing unit and a second-stage SFBB (SEPIC Fed Buck-Boost) conversion unit, for which, a 2-LyapESC MPPT(Maximum Power Point Tracking) control strategy based on ESC(Extremum Seeking Control) and Lyapunov switching coupling control is proposed to improve the MPPT output energy-efficiency of serial PV cells and optimize the energy management of power module. Simulative results verify the effectiveness of the proposed topology and MPPT control strategy.