Abstract
With the rapid development of distributed renewable energy, the AC distribution network is facing huge challenges. In comparison, the DC distribution network has many advantages. However, the control of the DC distribution network is complicated, and the only indicator to measure the power balance of the DC distribution network is the DC voltage. Therefore, in the DC distribution network, the control of DC voltage is important. This paper firstly compares the AC power distribution network and the DC power distribution network, and summarizes the advantages and disadvantages. Secondly, the topology structure of the DC distribution network is introduced, and the operation principle of constant DC voltage control and traditional droop control is compared. Aiming at the shortcomings of the both, an innovative voltage droop control strategy considering the voltage regulation range and power transmission limit is proposed. Finally, a two-terminal flexible DC distribution network simulation model with MMC is built in MATLAB/Simulink to verify the feasibility of the proposed control strategy.
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