A. Sapin

Modeling, Simulation, and Test of a Three-Level Voltage-Source Inverter With Output

This paper presents the modeling, the detailed simulation and the test of an efficient medium voltage adjustable speed drive. The system consists of a three-level neutral-point clamped (NPC) inverter supplied by a 12-pulse rectifier. To achieve a motor-friendly supply, an LC filter is inserted between inverter output terminals and induction motor terminals. A direct torque control (DTC) tunes the inverter. The full power circuits and the digital control scheme have been implemented and simulated. Simulation results have been compared successfully with measurements, in steady state and transients.

LC

The current source thyristor inverter is still today a suitable choice for supplying high power adjustable speed drives for pumps or compressors. This paper presents a 12-pulse LCI (load commutated inverter) synchronous drive for a 20 MW compressor, it focuses on the following main aspects: modeling of the complete drive system, numerical simulation and comparison between calculated and measured values of the pulsating torque components in steady-state operations. The modeling of the six-phase synchronous motor is obtained by using a new virtual test-platform for large electrical machines. The pulsating torque components are measured in real time with a digital transient torque measurement device.

Filter and Direct Torque Control

This paper presents the modeling, the detailed simulation and the test of an efficient medium voltage adjustable speed drive. The system consists of a three-level neutral-point clamped (NPC) inverter supplied by a 12-pulse rectifier. To achieve a motor-friendly supply, an LC filter is inserted between inverter output terminals and induction motor terminals. A direct torque control (DTC) tunes the inverter. The full power circuits and the digital control scheme have been implemented and simulated. Simulation results have been compared successfully with measurements, in steady state and transients.