Abstract
The combination of permanent magnet synchronous motor (PMSM) and inverter is the key electric drive system (EDS) of electric vehicles (EVs), and its overall efficiency seriously affects the energy consumption of EVs. In order to further improve the efficiency of PMSM-inverter, the influence of a special control object current angle β on EDS was studied and the general rule between β and EDS efficiency was obtained in this paper. Then, the golden section search (GSS) method was used to obtain optimal β and its corresponding stator current is, which can realize EDS working in optimal efficiency in the whole EDS working area. On this basis, an overall efficiency optimization control strategy for EDS based on the current angle β look-up table was proposed in this paper. To verify the effectiveness of the proposed control strategy, simulation considering iron loss and copper loss of motor and inverter loss was completed, which showed that compared with traditional control, the control strategy proposed in this paper can effectively improve the working efficiency of EDS under steady state and transient state.
Highlights
loss minimization algorithm (LMA) to improve the motor efficiency can be divided into two categories: Online search control (OSC) and loss model control (LMC)
The influence of current angle β on electric drive system (EDS) efficiency was studied and the general rule between β and EDS efficiency was obtained in this paper, which provides a reference for future research
It can be seen that the inverter efficiency was always maintained at a high level, and its change contributed less to the change of EDS efficiency than that of the motor
Summary
With the aggravation of greenhouse effect and the consumption of fossil energy, automobile companies are developing pure electric vehicles (EVs) vigorously to reduce emissions and improve fuel economy [1]. The efficiency of electric drive system (EDS) is a key factor affecting the energy consumption of the whole vehicle and EVs with high EDS efficiency can bring good driving experience to the driver [2], so it is essential to further improve the EDS efficiency
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