DC-Bus Capacitor Maximum Power Discharge Strategy for EV-PMSM Drive System With Small Safe Current

Abstract

To prevent the passengers from electric shock, the DC-bus capacitor voltage of the highvoltage permanent magnet synchronous machine (PMSM)-based drives in electric vehicles (EVs) is required to decline to safe voltage as quickly as possible when emergency occurs. Considering that the discharge time for small safe current limit powertrain systems will be longer than required, this paper proposed a maximum power discharge strategy to accelerate the dissipating process and meanwhile avoid the voltage surge. Firstly, the PMSM discharge model as a generator is established on the basis of analyzing the discharge course. Secondly, the feasible reference current trajectory is presented by drawing the trajectories of the voltage, current, and power constraints. Then the maximum power discharge strategy is achieved by following the extreme points in the reference trajectory. Finally, simulation and experiment are conducted on a three-phase SPMSM powertrain system to validate the proposed algorithm can effectively shorten the discharge process.INDEX TERMS Permanent magnet synchronous machine (PMSM), winding-based discharge, small safe current, maximum power.

Efficiency Map-Based PMSM Parameters Estimation Using Power-Oriented Modeling

“…IV-A and the maximum torque vs speed characteristic τ e max (ω m ) computed as described in Sec. IV-E. Other interesting output figures are provided by the Matlab App in the ''Figures_1'' and ''Figures_2'' screens, see PMSM_parameters_estimation.mlappinstall in [17]\Estimation_Matlab_App, such as the distribution of vectors ω V s and ω I s vs (ω m , τ e ), the E map error on plane (ω m , τ e ) defined in (10), the resistive voltage due to R s and to R s and R sq together, and the resistive torque due to b m and to b m , b mq and b coul together.…”

“…As an example, the PMSMs modeling is addressed in a d-q discretetime reference frame in [6]. A modeling in the d-q frame is also employed in [7]- [10], whereas a fault diagnosis model based on a Siamese network is proposed in [11]. A fundamental advantage of model-based methods is the knowledge of the mathematical model of the system under consideration.…”

DC-Bus Capacitor Discharge Method Based on Bleeder and Windings for Electric Vehicles in Emergency

“…Assuming that the core saturation, eddy current loss and hysteresis loss is ignored and harmonics and saturation is not considered, the mathematical model of PMSM in the rotating d-q frame are given by [25]- [27].…”