Abstract
Active discharge circuit is of great significance for discharging the dc-bus capacitor voltage to safe voltage in the electric vehicles (EVs) based PMSM drive system when EVs encounter an emergency such as a crash event. However, when electric vehicle occurs a collision, the active discharge circuit may be damaged or failed, which poses a great electric threat to the passengers and succors. In order to resolve the problem, this article proposes a winding-based dc-bus capacitor discharge method. To quickly discharge the dc-bus capacitor energy, the machine windings are used as discharge resistance with active discharge circuit fault. For the purpose of reducing the bus voltage to safe voltage as soon as possible, the discharge method can be divided into two phases, rapid discharge stage and bus voltage regulation stage. Firstly, the dc-bus voltage will be dropped to safe voltage due to the large flux-weakening current applied to the d-axis. Secondly, in order to stabilize the bus voltage at safe voltage, an extended observer state (ESO) is designed to estimate and compensate the total power loss that is regarded as disturbance in bus voltage regulation stage. The parameters of the proposed ESO are designed and the tracking performance is analyzed. Finally, the proposed discharge technique is validated by both simulation and experiments, which are conducted on a three-phase SPMSM drive platform.
Highlights
The electric vehicles (EVs) are becoming more and more prevalent in our life on account of energy-saving and zeropollution-emission operation [1]–[4]
The drive system has been disconnected from the battery at this time, the back electromotive force (EMF) of Permanent magnet synchronous motor (PMSM) and the remaining energy of the bus capacitor will maintain the dc-bus voltage at a high voltage for a long time
This study aims to propose a robust dcbus capacitor discharge technique for the EVs PMSM drives under the discharge circuit fault
Summary
The electric vehicles (EVs) are becoming more and more prevalent in our life on account of energy-saving and zeropollution-emission operation [1]–[4]. X. Zhang et al.: Robust Control of Winding-Based DC-Bus Capacitor Discharge for PMSM Drives in EVs. ECC R94 requirements that less than 5s, it will lead bleeding resister volume is large and fragile [12]. In [13], the dcbus capacitor energy is dissipated in the form of heat by shorting the inverter, which turn on the MOSFETs or IGBTs of one or more bridge in the inverter at the same time to constitute a short circuit This method can prevent the kinetic energy of motor flowing into the capacitor, it will lead to large discharge current which may damage the inverter. Thereby, a robust winding-based dc-bus capacitor discharge method based on ESO is presented in this part
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