Component
École Nationale Supérieure d'Électrotechnique d'Électronique
Objectives
To acquire the knowledge necessary to contribute to the design of the inverter powering an AC machine, integrating aspects such as architecture, control, and semiconductor selection.
+ To be able to justify the power structure of the power converter (three-phase inverter) and identify the main sizing parameters.
+ To identify the degrees of freedom provided by the three-phase inverter structure and understand their variation at different time scales (instantaneous, in the low-frequency range relative to the switching frequency).
+ To know how to use the degrees of freedom to control the currents injected into the machine windings.
+ To understand power reversibilities (at the time scales of the switching period, the machine current period, and steady state).
+ To understand the operating constraints of the inverter's power supply stage, related to the inverter's power reversibilities.
+ To understand the inverter's filtering principle (DC stage) and size the filter components.
+ To understand the instability phenomenon resulting from the "constant power load" behavior of the inverter with its associated regulation
+ Understand the stabilization principle and design a dedicated circuit
+ Identify the losses generated in the semiconductor components of the inverter's switching cell, their nature (conduction or switching), and their location (transistor or diode)
+ Understand the datasheet content of a power transistor and a heat sink
+ Know how to size the number of power modules to use for a given current range
+ Know how to use a transistor and diode loss model in PLECS and analyze the simulation results
+ Understand the sizing of a heat sink and know how to simulate the dynamic thermal behavior of the circuit for several operating points
Description
2 lecture volumes: Architecture and Control (3 x 1.75 hours)
- HP Semiconductor Components (2 x 1.75 hours)
- MC
1 Design Office module (2 x 3.5 hours), based on the use and improvement of a simulation model (PLECS software):
+ Study of the architecture and implementation of the control system for a drive (permanent magnet synchronous machine)
+ Study and dimensioning of the filtering stage (DC side of the inverter)
+ Study of the reversibilities of the current drawn by the inverter from the DC source
+ Identification of the instability phenomenon and dimensioning of a stabilizing solution
+ Study of the losses generated in the semiconductor components constituting the inverter's switching cell
+ Analysis of the datasheet for a SiC MOSFET and Si IGBT power transistor
+ Dimensioning of the number of power modules to be used based on a target operating point
+ Use of PLECS models of transistor and SiC and Si diode losses
+ Dimensioning of the heat sink and thermal simulation of the assembly
Pre-requisites
+ Understanding of switching cells and connection functions; Static and dynamic characteristics of semiconductor components (2A-NRJ course: N7EE02A)
+ concepts of switching and conduction losses in semiconductor components (2A-NRJ course: N7EE02A - Energy approaches to CVS design)