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EV twin AC charging

Demonstrates the main functionalities for HIL testing of electric vehicle smart charging in the toolbox ev smart charging twin. The model applies charging according to standard IEC 61851. With the loop back functionality also virtual HIL can be used for AC charging.

Introduction

Smart Charging of Electric vehicles (EV) is the most favorite charing use case in residential applications. For most consumers it is profitable if they mostly charge their EV with the onsite generated electricity. This smart charging strategy is also beneficial for the electricity network as generation peaks of photovoltaic can be reduced. Thus, smart charging requests an energy management that controls EV via the EV supply equipment (EVSE) on the residual load measured at the point of grid connection.

In the simplest case for unidirectional smart charging with AC EV and EVSE communicate via the standard IEC 61851. In short, once the charing is authorized and EV is plugged the EVSE enables charging and can define a maximum current that ranges between 6 A and its current limit (typical 16 A or 32 A). The EV can charge within these limits. The car detects by voltage measurement if it can charge on one or three phases. Details about this standard are described in the example Electric vehicle charging.

This application note describes the way for controller HIL and power HIL emulation of electric vehicles using the toolbox ev smart charging twin.

Model Description

The model shown in Figure 1 comprises of two main subsystems from the ev twin library: 1. EVSE AC: AC EV sypply equipment 2. ev twin: EV emulation

Figure 1: Overall model for HIL testing of charging infrastructure.

Main functionality of the setup is to provide a controller HIL test of EVSE wit the emulated car. For demonstration the model must be operated in Loop-back.