All-vanadium redox flow battery charging and discharging control system based on three-closed loop structure and control strategy thereof

Abstract

The present invention discloses an all-vanadium redox flow battery charging and discharging control system based on a three-closed loop structure and a control strategy thereof. The all-vanadium redox flow battery charging and discharging control system comprises a SOC controller, a voltage controller, a current controller, an all-vanadium redox flow battery, a pre-estimation module and a direct current convertor. The control strategy employs three closed loop structure, the real charge state of the all-vanadium redox flow battery is fed back to the input end of the SOC controller, and a first closed loop structure is formed; the stack voltage estimation value of the all-vanadium redox flow battery is fed back to the input end of the voltage controller, and a second closed loop structure is formed; the real charging and discharging current of the all-vanadium redox flow battery is fed back to the input end of the current controller, and a third closed loop structure is formed. The all-vanadium redox flow battery charging and discharging control system based on a three-closed loop structure and the control strategy thereof are able to realize the estimation of the stack voltage of the all-vanadium redox flow battery, realize the charging and discharging control of the all-vanadium redox flow battery so as to improve the power storage capability of the all-vanadium redox flow battery and enhance the charging speed of the batter in the safe condition.

Description

technical field [0001] The invention belongs to the technical field of battery charge and discharge control, and in particular relates to a charge and discharge control system of an all-vanadium redox flow battery based on a three-closed-loop structure and a control strategy thereof. Background technique [0002] With the rapid development of society and economy, global warming, environmental pollution, traditional energy crisis and other phenomena are becoming more and more serious, and the strategy of vigorously developing clean energy and developing renewable energy has been put on the agenda. Renewable energy sources such as photovoltaics and wind energy are volatile, random, and intermittent, which have an impact on the power grid. In addition, the phenomenon of "abandoning wind and light" is becoming more and more serious, which affects the utilization and development of renewable energy. Therefore, energy storage is urgently needed system to increase the utilization r...

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Problems solved by technology

Patent "A Safe Charging and Discharging Control Method of Vanadium Redox Flow Battery Containing DC / DC Converter" (Patent No.: 201210524163.0) and Document "Safe Charging and Discharging Strategy of Vanadium Redox Flow Battery Energy Storage System Containing DC / DC Converter" A DC / DC converter double-closed-loop strategy is proposed, in which the inner loop is controlled by the average current of the inductor on the VRB side, and the outer loop is controlled by constant power, constant voltage, and trickle switching. This control strategy does not take into account the stack voltage of the all-vanadium redox flow battery. And the outer loop should be switched according to the conditions, the controller is complex

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