Abstract
Droop control is a commonly used control strategy in DC microgrids. However, traditional droop control has two main problems. Firstly, the output voltage is lower than the reference voltage. Secondly, due to the unequal line impedance, the accuracy of power sharing is greatly reduced. In order to solve these two problems, this paper proposes a new control strategy, which improves the output voltage, greatly reduces the error between output voltage and the voltage reference, and improves current distribution accuracy. In this control method, the output voltage is compensated by voltage compensation controller. The droop coefficient of converter is compensated by the droop coefficient compensator to adapt line impedance of each converter, thereby the current distribution accuracy of DC converters is improved. In this method, only local controllers are utilized, and each DC converter exchanges information with the remaining DC converters through low bandwidth communication (LBC) network. The simulation model based on PLECS verifies the feasibility of this control strategy. Finally, a hardware platform consisting of two buck converters and one boost converter is built, and the experimental results reconfirm the effectiveness of the proposed control algorithm.
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