期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 70, 期 8, 页码 8118-8128出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3229317
关键词
Batteries; Modulation; State of charge; Voltage; Voltage control; Harmonic analysis; Inverters; Cascaded H-bridge (CHB) converter; overmodulation; photovoltaic (PV)-battery system; power control; power imbalance
Due to factors such as nonuniform solar irradiance and inconsistent module features, the output power among photovoltaic (PV) modules in a single-phase cascaded H-bridge (CHB) inverter is unequal. This article proposes a PV-battery hybrid CHB converter and a flexible power control strategy to extend the operating range under unity power factor condition. The control method adjusts the injected power of the battery module based on the maximum modulation index of all PV modules, preventing overmodulation and improving energy harvested.
Due to the nonuniform solar irradiance, different temperature, and inconsistent module features, the output power among each photovoltaic (PV) module in a single-phase cascaded H-bridge (CHB) inverter is unequal. The H-bridge module with higher power generation faces the risk of overmodulation. To further extending the operating range of the CHB PV inverter under unity power factor condition, in this article, a battery module is connected with the system in series to form a PV-battery hybrid CHB converter. Meanwhile, the corresponding flexible power control strategy is proposed. The injected power of the battery module is controlled adaptively according to the maximum modulation index of all PV modules. With the proposed approach, all PV modules are free from overmodulation even with severe power imbalance, and thus, more energies are harvested. The effectiveness of the proposed control method is verified by experimental results.
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