1. Solar Powered EV Charging 2. Multi Frequency IPT System DC Systems, Energy Conversion & Storage Department of Electrical Sustainable Energy Delft University of Technology, the Netherlands v.prasanth@tudelft.nl, p.bauer@tudelft.nl Venugopal Prasanth, Pavol Bauer 1
Contents EV-PV Charging Stations Problem Definition and Research Goals Introduction to IPT and Multi-Coil Topologies Mutual Inductance in Multi-Coil Topologies Multi-Frequency IPT Design and Experimentation 2
EV-PV charging station 10kW solar powered EV charger for workplace Solar panels Converter Charging pole (s) EV @ workplace 3
EV-PV power converter Requirements of MPC for EV-PV charger High Efficiency bidirectional power converter Modular converter architecture Galvanic isolation of EV from grid and PV Minimal harmonics at grid interface Cohesive design with EMS γ MPC ηi MPC 10 kw MPC PV panels 10 kwp PV MPPT converter (DC/DC) DC link Isolated EV charger (DC/DC) Inverter (DC/AC) AC Interconnection α MPC β MPC ηi MPC 4
EV-PV power converter Modularity in EV-PV charger Multiple EV 25kW PV DC/AC (High f) DC/DC Converter (MPPT) EV charging 10kW Simultaneou s charging of upto 3 EV 22kW EV charging 10kW DC/AC (High f) DC/AC (High f) AC/DC (High f) DC link 3 Phase DC/AC VSI Filter 3 Phase AC 400V, 32A 22kW EV charging 10kW 10kW PV DC/DC Converter (EV) DC/DC (MPPT) Simultaneous charging of upto 3 EV 22kW DC/DC Converter (EV) DC/AC (High f) AC/DC (High f) DC link 3 Phase DC/AC VSI 3 Phase AC 400V, 16A DC/DC Converter (EV) 5
EV-PV power converter Modularity in EV-PV charger Multiple PV EV-PV Charger 10kW PV 10kW PV EV charging 10kW 200-500V, 30A max. DC/AC (High f) AC/DC (High f) DC link DC/DC (MPPT) 3 Phase DC/AC VSI Filter 3 Phase AC 400V, 16A PhD Student Contact: Gautham Ram G.R.ChandraMouli@tudelft.nl 10kW PV DC/DC (MPPT) EV charging 10kW 200-500V, 30A max. DC/AC (High f) AC/DC (High f) DC link 3 Phase DC/AC VSI DC/DC (MPPT) Filter 3 Phase AC 400V, 32A 10kW PV 6
Introduction to Inductive Power Transfer (IPT) Magnetically coupled Transmitter and Receiver Large Air Gap Capacitive compensation: Unity Power Factor 7
Problem Definition Multi-Coil IPT Topologies M NXP Semiconductors 8
Multi-Coil IPT Topologies Inter-Phase Mutual Inductance: Three Phase Highway Systems M M M 1 M 2 9
Multi-Coil IPT Topologies Secondary System M M M M M Primary System 10
The Problem with inter-coil Mutual Inductance Difficult to independently power the two coils Causes detuning of respective Resonant Circuit Causes undesired power transfer within the primary and/or secondary 11
Solutions to Inter-Coil Mutual Inductance Spatial Decoupling: Univ of Auckland Bipolar Pad Double-D Quadrature (DDQ) 12
Multi Frequency IPT Would lead to frequency decoupled IPT Systems? Could it be possible to multiplex power flow, much like in analog and digital communication? 13
Realisation of Multi Frequency IPT One Transmitter Coil 1 Two Transmitter Coils Secondary System Frequency 1 Frequency 2 Frequency 1 Frequency 2 COIL 1 COIL 2 Primary System Independent frequency amplitude relation 1 st and 3 rd harmonic only 1 Pantic, Z., Lee, K., & Lukic, S. (2014). Multi-Frequency Inductive Power Transfer. IEEE Transactions on Power Electronics 14
Frequency Selection 15
Circular Coil structure Two concentric circular coils. Inner Coil: 100 khz, Outer Coil: 20 khz Air Gap: 100 mm 20 khz System 100 khz System 16
Frequency Components in Output Voltage Waveforms (Circular coil) 20 khz System 100 khz (105.5 khz) System The output voltage (and current) of the 20 khz system has a component of 100 khz. The amplitude of the 100 khz signal is about 20% of the amplitude of the 20 khz signal. 17
Addition of inductance to 20kHz System 18
Design Procedure Principle of superposition used to evaluate induced currents Series inductance added to enable frequency decoupling 19
Quantification of Decoupling 20
Experimental Results 10 W System f 1 = 100 khz, f 2 = 20 khz 21
Thank you and Questions!! 22