Work Package 1 – Development of the power flow controller
| T1.1 Analysis of the various scenarios in EV charging stations |
| T1.2 Development of the algorithm for the power flow controller (PFLC) |
| T1.3 Design of the digital control system |
| T1.4 Internal and External Communication |
Work Package 2 – SiC-based power electronics submodules
| T2.1 Analysis of the operating conditions |
| T2.2 Selection of the power semiconductor devices and passive components |
| T2.3 Design of the gate drivers |
| T2.4 Cooling system |
| T2.5 Layout |
| T2.6 Assembling & initial tests of the module |
| D2.1: The layout of the power electronics submodule enabling easy adaptation to the needs of AC-DC and DC-DC converters |
| D2.2: Laboratory prototype of the SiC-based power electronics submodule |
Work Package 3 – Reconfigurable, multiport isolated DC-DC converter
| T3.1 will focus on mapping the existing multiport isolated DC/DC converters, as well as, power electronic converter concepts with re-configurability features. This task will also identify design and operating challenges in the existing multiport topologies and will propose potential improvements |
| T3.2 will deliver the most suitable and best performing topology for isolated DC/DC converters based on dual-active bridge converters along with their high-frequency transformer concept for enabling multiple interconnections in the charging station. |
| T3.3 A proper modulation scheme enabling bidirectional power flow through the multiport DC/DC converter and high efficiency operation under load variations will be developed |
| T3.4 The electrical modelling of the multiport isolated DC/DC converter will be developed |
| T3.5 will deliver the thermal modelling and simulations of the DC/DC converter, with a particular focus on the thermal performance of the SiC power MOSFET and high-frequency transformer at rated power and beyond ratings (i.e. short-term overloading operation). |
| T3.6 . The electrical and thermal models developed in Tasks 3.4 and 3.5 will be combined and utilized for optimizing the volume and weight of the converters, as well as, its efficiency. |
| T3.7 Based on the optimized design resulted from Task 3.6, a full-scale (i.e. 10 kW) laboratory prototype of the multiport DC/DC converter will be constructed and the initial experimental validation will be performed |
Work Package 4 – Bidirectional multilevel AC-DC converter rated at 20 kVA
| T4.1 Selection of the AC-DC topology |
| T4.2 Simulation-based efficiency-oriented design of the 20 kVA AC-DC converter |
| T4.3 Layout of the power section |
| T4.4 Design of the magnetic components |
| T4.5 Control algorithm for bidirectional operation |
| T4.6 DSP-based controller |
| T4.7 Assembling & initial tests of the AC-DC converter |
| T4.8 Laboratory measurements of the AC-DC converter |
Work Package 5 – Non-isolated DC-DC converter for the energy storage
| T5.1 Assessment of the fundamental design of an non-isolated DC/DC converter topology enabling bidirectional operation and three-level voltage on the high side. |
| T5.2 Theoretical and simulation-based verification of various configurations of the non-isolated DC/DC converters for supplying charging power in the range of 10-20 kW. |
| T5.3 Development of the DC/DC converter control algorithm including DC voltage balancing system and operation at maximum efficiency in different operation modes |
| T5.4 Identification of electrical and thermal operating parameters in terms of voltage, current and temperature. |
| T5.5 Design of the non-isolated DC/DC converter including main circuit layout with the necessary auxiliary sub-circuits and high-frequency magnetic components. |
| T5.6 Delivery and initial tests of the non-isolated DC/DC converter in all operation modes. |
Work Package 6 – Integration & experiments on the complete EV charging system
| T6.1 Integration of the power converters in one charging system |
| T6.2 Investigation of the operation when system is charging two vehicles from the grid in slow charging mode (A). The AC-DC converter and two isolated DC-DC converters will be tested supplying power up to 2×10 kW to two loads. Waveforms of the specific voltages and currents will be observed but most crucial will be measurements of the efficiency at THD of the input power. |
| T6.3 Verification of the mode B, when slow charging and recharging of the energy storage is considered. This test will be similar to the previous one but instead one DC-DC converter, the non isolated DC-DC converter will be charging the battery stora |
| T6.4 Validation of the fast charging mode, also including the energy storage (mode C). All components of the investigated system will be tested at full power to provide 2×20 kW at the outputs of the isolated DC-DC converters. Again, efficiency measurements and THD f the grid current will be observed |
| T6.5 Testing of the grid support with the use of the storage (D). During this test two components: the AC-DC converter and the non-isolated DC-DC converter will be experimentally verified (efficiency measurements, THD monitoring) during the grid support mode (up to 20kW) |
| T6.6 Investigation of the vehicle-to-grid operation (E). This test will be close to the previous but instead the battery storage energy will be delivered by two isolated DC-DC converters |
| T6.7 Verification of the stand-alone mode, a case with charging during the grid fault (F). In this mode, ability to deliver 2x10kW from the storage to the outputs of the non-isolated DC-DC converters will be tested |