Abstract
This study presents a centralized control scheme that coordinates parallel operations of power conditioning system (PCS) for the grid interactions of electric vehicles (EVs) in EV charge–discharge and storage integration station. Key issues for the control and operation of PCS under various operation modes are discussed, including vehicle to grid (V2G) mode, stand-alone mode and seamless transfer mode. The intelligent multi-mode charge–discharge method is utilized for the V2G mode, and the parallel control method based on communication network is adopted for the stand-alone mode. In addition, a novel seamless transfer strategy is proposed, which is able to implement PCS transition between V2G mode and stand-alone mode. The detailed process of the seamless transfer between the two modes is illustrated. Experimental results are presented to show the performance and feasibility of this strategy.
Highlights
The needs to reduce pollutant gas emissions and the increasing energy consumption have led to an increase of the CrossCheck Date: 31 March 2014The charge–discharge and storage integration station, consisting of bi-directional converters and hierarchical control structure, is able to realize bidirectional power flow between electric vehicles (EVs) and power grid
Many research works on designing the topologies and controllers of bi-directional power electronic converters for EV application, which are able to function as battery charger and to transfer electrical energy between battery pack and the grid [11,12,13]
In [18], a control strategy based on the frequency and magnitude droop control is used for the distributed generation (DG) to achieve a seamless transfer between grid-tied mode and islanding mode
Summary
The needs to reduce pollutant gas emissions and the increasing energy consumption have led to an increase of the CrossCheck Date: 31 March 2014. In [18], a control strategy based on the frequency and magnitude droop control is used for the distributed generation (DG) to achieve a seamless transfer between grid-tied mode and islanding mode. Both the magnitude and the frequency of the output voltage are varied due to the droop operation. In [19], a transfer strategy based on indirect current control is proposed for the three-phase inverter in the DG. An improved transfer control strategy based on indirect current control is proposed according to the model of three-phase (power conditioning system) PCS in the synchronous reference frame. The control scheme has been verified on a 1 MW parallel connected PCS prototype
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