Capacity Calculation of Shunt Active Power Filters for Electric Vehicle Charging Stations Based on Harmonic Parameter Estimation and Analytical Modeling

Abstract

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.

Integrating Internal Model Controller (IMC) into Electric Vehicle Charger of Multiple Charging Mode: DC and AC Fast Charging

“…In addition, the charging currents and voltages with high total harmonic distortion (THD) can eventually damage other electrical and electronic devices around the charger station, such as conductors and transformers [5]. Recently, the THD that are generated through an EV charging process is standardized by IEC 1000-3-2 and SAE J2894/1 standards, where these standards are highlight the limit of THD allowed by EV charging [6].…”

“…Shunt APFs are more conventionally used compared to series APFs in the EV fast charging stations. Shunt APFs have several advantages, such as easy installation and capable of improving the power factor by decreasing the reactive power drain on the distribution network [6]. The researchers in [12], developed a fast battery charger with shunt APF to improve the power factor correction and to decrease the THD by imposing the utility to supply the active current.…”

Minimizing Harmonic Distortion Impact at Distribution System with Considering Large-Scale EV Load Behaviour Using Modified Lightning Search Algorithm and Pareto-Fuzzy Approach

“…Equations (3), (4), and (5) show the impedance formulation for the load used in setting up the harmonic admittance matrix. The harmonic flow is calculated using (6), which consists of harmonic admittance matrix and harmonic current injection as per (7) and (8). (9), while the current produced by CS can be calculated using (10).…”

“…Furthermore, it will also introduce harmonic distortion due to the power electronic devices that convert alternating current (AC) to direct current (DC) at CS [3,4]. This harmonic distortion will cause negative impact such as increment heating losses, shorter insulation lifespan, increased temperature and insulation stress, decreased power factor, and lower efficiency [5,6].…”

Fundamental Active Current Adaptive Linear Neural Networks for Photovoltaic Shunt Active Power Filters

“…Specifically, in smart grid systems, these problems may arise with involvement of multiple energy sources and systems which include photovoltaic (PV) grid connected systems [1][2][3][4][5][6]. Among the effects of current harmonics are capacitor blowing, equipment overheating, motor vibration and excessive neutral currents [7,8]. To compensate current harmonics, a powerful tool is the active power filter (APF), which is better as compared to a passive filter, since it can mitigate multiple harmonics instantaneously.…”