Abstract As high current would only be triggered when the bus voltage reach the corresponding threshold value, the bus voltage can continuously deviate from nominal value a lot under original multi-hysteresis control strategy based on bus voltage. Aimed at solving this problem, an improved multi-hysteresis control strategy was proposed. A voltage-level signal was defined and would be integrated to assist in switching the reference current of the accumulator battery. Thus the accumulator battery can charge or discharge with large current when necessary even the bus voltage did not reach the corresponding threshold value, maintaining the bus voltage closer to the nominal value. Considering that negative integral value would lengthen the switching time of reference current when the bus voltage deviate positively, two integrators were used to assist in switching the positive and negative reference current separately. The simulation result validated that the proposed control strategy is of advantage over original strategy on maintaining the bus voltage and improving the quality of power supply.
Liu Zhibo,Liu Xingjie. Improved Multi-Hysteresis Control Strategy of Hybrid Storage System in a Stand-Alone DC Microgrid[J]. Transactions of China Electrotechnical Society, 2018, 33(3): 490-497.
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2018, Vol. 33 
