Robust Control of Winding-Based DC-Bus Capacitor Discharge for PMSM Drives in Electric Vehicles

When electric vehicles (EVs) meet an emergency such as a crash incident, the active discharge circuit is critical for discharging the dc-bus capacitor voltage to a safe voltage in the PMSM drive system. However, if an electric car collides, the active discharge circuit may be damaged. damaged or failed, posing a significant electric threat to passengers and aids. In order to overcome the problem, This article suggests a dc-bus capacitor discharge method based on windings. to discharge fast The machine windings are used as discharge resistance with active dc-bus capacitor energy. Fault in the discharge circuit The discharge method can be separated into two phases, rapid discharge stage and bus voltage regulation stage, to reduce the bus voltage to a safe value as quickly as feasible. Due to the significant ux-weakening current applied to the d-axis, the dc-bus voltage will first be reduced to a safe level. Second, an extended observer state (ESO) is built to estimate and correct the total power loss that is considered a disturbance in the bus voltage control stage in order to maintain the bus voltage at a safe level. The suggested ESO's parameters are designed, and the tracking performance is evaluated. Finally, simulation and experimentation on a three-phase SPMSM drive platform are used to validate the suggested discharge technique.

Keywords: Permanent magnet synchronous machine (PMSM), winding-based discharge, dc-bus discharge, extended state observer.