Abstract
In a bipolar DC distribution network, the unbalanced load resistance, line resistance and renewable energy source will cause an unbalanced current for each node of the neutral line and lead to its unbalanced voltage. This is a unique power quality problem of bipolar DC distribution networks, which will increase the power loss in the network and lead to overcurrent protection of the neutral line in serious cases. A voltage balancer can be adopted to suppress the unbalanced voltage and current. However, the existing literature does not consider the consistent application of multiple voltage balancers in a multi-node bipolar DC distribution network. This paper creatively proposes a consensus control topology combining primary control and secondary control in a radial multi-node bipolar DC distribution network with voltage balancers. In this paper, the formulas for the positive and negative current and duty cycle of a bipolar DC distribution network with voltage balancers are derived, and improved voltage balancer modeling based on a consensus algorithm is built. The radial multi-node bipolar DC distribution network is established in MATLAB/Simulink. The simulation results compare the consensus control with the traditional droop control and verify the effectiveness of the new control structure with voltage balancers.
Highlights
The application of DC distribution is an effective method of power transmission [1].With the addition of various DC loads, it can be found that the efficiency of the DC distribution network is much higher [2]
This paper proposes an optimized consensus control structure based on a sparse communication network, and the main contributions of this study are as follows: 1
The parameters adopted in the system with four voltage balancer (VB) in parallel was built in MATLAB/Simulink
Summary
The application of DC distribution is an effective method of power transmission [1]. With the addition of various DC loads, it can be found that the efficiency of the DC distribution network is much higher [2]. With the development of a DC microgrid, the DC distribution system has attracted more attention [3]. Compared with the AC distribution system, it has many advantages [4]: Licensee MDPI, Basel, Switzerland.
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