Battery charge-discharge control strategy based on the single Z-source three-level SVPWM inverter

A battery charge-discharge control strategy which based on the single Z-source three-level space vector pulse width modulation (SVPWM) inverter and the designed corresponding closed-loop control system is proposed. The inverter can not only eliminate the transformer or DC/DC converter link in traditional system, but also realize charger-discharge control in the case of a large range of battery voltage changes. The stage charging control based on the current feed-forward decoupling, the constant discharging control based on the power feed-forward decoupling and the output voltage boost method in constant discharging control are researched. The simulations in Matlab/Simulink verified that it can achieve the constant voltage or current charging control under unity power factor as well as the grid-connected constant power discharging control with boosted output voltage.