Abstract
The influence of electric vehicle charging stations on power grid harmonics is becoming increasingly significant as their presence continues to grow. This paper studies the operational principles of the charging current in the continuous and discontinuous modes for a three-phase uncontrolled rectification charger with a passive power factor correction link, which is affected by the charging power. A parameter estimation method is proposed for the equivalent circuit of the charger by using the measured characteristic AC (Alternating Current) voltage and current data combined with the charging circuit constraints in the conduction process, and this method is verified using an experimental platform. The sensitivity of the current harmonics to the changes in the parameters is analyzed. An analytical harmonic model of the charging station is created by separating the chargers into groups by type. Then, the harmonic current amplification caused by the shunt active power filter is researched, and the analytical formula for the overload factor is derived to further correct the capacity of the shunt active power filter. Finally, this method is validated through a field test of a charging station.
Highlights
Due to the increasing environmental pollution and the growing shortage of resources, countries have begun to develop electric vehicles, which necessitate the construction of the corresponding facilities, such as charging stations [1,2]
Electric vehicle chargers typically use pulse width modulation (PWM) [11] or active power factor correction technology [12] to suppress the harmonics from the charging infrastructure
Active power filters (APF) can be used in a charging station to compensate for the harmonics produced by the nonlinear loads
Summary
Due to the increasing environmental pollution and the growing shortage of resources, countries have begun to develop electric vehicles, which necessitate the construction of the corresponding facilities, such as charging stations [1,2]. Previous studies [19,20] have presented frequency-domain analytical models of single-phase uncontrolled and thyristor-controlled rectification circuits for a single-phase rectifier with low power. These models have demonstrated the contribution of the terminal voltage harmonics to the current harmonics. This paper analyzes the characteristics of the charging current for an electric vehicle charger with a three-phase uncontrolled rectification circuit and a passive power correction link under different operating conditions based on the measured AC voltage and current. A capacity correction method is proposed for the shunt APF in a charging station based on the harmonic current amplification effect The feasibility of this method is verified by adopting it in an electric vehicle charging station
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