Abstract
This study introduces a three-phase virtual synchronous motor (VSM) control and its possible application for providing fast-charging service from off-board chargers of electric vehicles (EVs). The main circuit of the off-board charger consists of a three-phase voltage source PWM rectifier (VSR) and a resonant LLC zero-voltage-switching converter. In the proposed control approach, VSM-controlled pre-stage VSR emulates the external characteristics of a synchronous motor (SM), simultaneously, droop control based on charging mode in the VSM can satisfy the demand of the EVs constant-current fast-charging; The post-stage DC–DC converter is responsible for stabilizing the DC bus voltage. The feature of this control strategy is that VSM and fast charging control are implemented by the pre-stage converter, which has better coordination. In the MATLAB, the equivalent synchronous grid of the distribution network supplies to the power battery through the off-board charger, and the effectiveness of the presented control is demonstrated by typical working conditions.
Highlights
The energy crisis [1] and environmental pollution [2] are the main reasons for leveraging the large-scale adoption of electric vehicles (EVs)
If three-phase virtual synchronous motor (VSM) continue to employ proportional resonant (PR) controller which is used in single-phase control, this implies that six PR controllers will be needed for achieving double closed-loop control
The equivalent synchronous grid constituted of the synchronous generator (SG) with primary regulation characteristics is the equivalent simulation of all the power supplies in the practical grid, whose capacity is equal to the sum of the capacities of all the power supplies
Summary
The energy crisis [1] and environmental pollution [2] are the main reasons for leveraging the large-scale adoption of electric vehicles (EVs). With widespread concern of fast charging, VSM-based control has gradually concentrated on three-phase power converters. If three-phase VSM continue to employ proportional resonant (PR) controller which is used in single-phase control, this implies that six PR controllers will be needed for achieving double closed-loop control This can be avoided by leading into vector control based on three-phase instantaneous reactive power theory, as mentioned in [13,14]. Extends to VSM control based on fast charging mode, in which the pre-stage converter implements VSM function and maintains the DC bus voltage stability, and the post-stage circuit realizes constant-voltage charging by means of double closed-loop control. In the VSM strategy, droop control based on charging mode allows off-board charger to operate with constant-current fast charging. The intended performance of the proposed method and the system was verified through simulation
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