Abstract
A high-power charging station for electric vehicles usually adopts a parallel structure of multiple power modules. However, due to the parameter differences among power modules, a parallel system always has circulating current issues. This paper takes a non-isolated AC/DC charging module as the research object and proposes a current sharing control strategy for multiple power modules based on the consensus algorithm. By constructing a sparse communication network with the CAN (Controller Area Network) protocol and exchanging current information, accurate current sharing among power modules is realized. Firstly, the zero-sequence circulating current issue is analyzed through a parallel model of the three-phase rectifier, with an improved circulating current restraint strategy proposed based on the zero-sequence voltage compensation. Then, the principle of the consensus algorithm is explained, which is applied to the current sharing control of multiple power modules. Finally, the proposal is tested by the designed simulation and experimental cases. From the obtained results, it can be seen that the proposed control strategy can effectively realize accurate current sharing among multiple power modules and well restrain the zero-sequence circulating current at the input side.
Highlights
Nowadays, with the fast development of electric vehicles, the charging station industry has received widespread attention
According to the form of the output voltage, electric vehicle charging stations can be divided into two types: The AC charging station and DC charging station
9, this paper proposes a current sharing control method based on the consistency algorithm
Summary
With the fast development of electric vehicles, the charging station industry has received widespread attention. The rectifier circuit, which develops from uncontrolled rectification to phase-controlled rectification, and to PWM (Pulse Width Modulation) rectification, is the core of a charging station Among these circuits, the three-phase voltage type PWM rectifier has low current harmonics, a high power factor and adjustable output voltage, which can realize the green conversion of electric energy. In References [4,5], an isolation transformer is added to the AC input side of each rectifier to block the zero-sequence path Another hardware method is to use passive components, such as a common mode inductor and current balancer among parallel rectifier modules [6]. In view of the insufficiency of the circulation current suppression methods mentioned above, in this paper, an improved SVPWM control strategy with superimposed zero-sequence voltage components is proposed.
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