Abstract
A battery-energy-stored quasi-Z-source cascaded multilevel inverter (qZS-CMI)-based photovoltaic (PV) power generation system combines advantages of a qZS inverter, a CMI, and a battery energy storage system. However, unbalanced battery state of charge (SOC) between cascaded H-bridge inverter modules will degrade an entire system's performance and shorten battery lifespan. This paper proposes a control method to balance battery SOCs of all modules, no matter the intermittent states of each module's PV power. The method is on the basis of battery SOCs, SOC limits of each module, and the total power injected into the power grid. Simulation and experimental results verify the proposed control method that ensures identical SOCs for the battery-energy-stored qZS-CMI PV system.
Original language | English |
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Article number | 8016600 |
Pages (from-to) | 2268-2279 |
Number of pages | 12 |
Journal | IEEE Transactions on Industrial Electronics |
Volume | 65 |
Issue number | 3 |
DOIs | |
Publication status | Published - Mar 2018 |
Externally published | Yes |
Keywords
- Battery energy storage (BES)
- cascaded multilevel inverter (CMI)
- quasi-Z-source inverter (qZSI)
- solar power generation
- state-of-charge (SOC) balancing