Abstract
To improve the endurance mileage of electric vehicles (EVs), it is important to decrease the energy consumption of the Permanent Magnet Synchronous Motor (PMSM) drive system. This paper proposes a novel loss optimization control strategy named system efficiency improvement control which can optimize both inverter and motor losses. A nonlinear power converter loss model is built to fit the nonlinear characteristics of power devices. This paper uses double Fourier integral analysis to analytically calculate the fundamental and harmonic components of motor current by which the fundamental motor loss and harmonic motor loss can be accurately analyzed. From these loss models, a whole-frequency-domain system loss model is derived and presented. Based on the system loss model, the system efficiency improvement control method applies the genetic algorithm to adjust the motor current and PWM frequency together to optimize the inverter and motor losses by which the system efficiency can be significantly improved without seriously influence on the system stability over the whole operation range of EVs. The optimal effects of system efficiency is verified by the experimental results in both Si-IGBT-based PMSM system and SiC-MOSFET-based system.
Highlights
One of the major challenges currently faced in the transportation sector is how to decrease the dependency on fossil fuels and reduce the emission of greenhouse gases
Compared with induction motors (IMs) and switched reluctance motors (SRMs) [4,5], permanent magnet synchronous motors (PMSMs) with their advantage of high power density and high efficiency, can decrease the energy consumption and improve the operational mileage of electric vehicles (EVs) [6,7,8], the Permanent Magnet Synchronous Motor (PMSM) direct drive system has been widely applied in EVs for transportation
PMSM drive drive system system which which is is designed designed and and Figure implemented to verify the performance of the proposed system loss optimized control strategy
Summary
One of the major challenges currently faced in the transportation sector is how to decrease the dependency on fossil fuels and reduce the emission of greenhouse gases. As the inverter loss is an important part of system loss in the PMSM system for transportation, these motor control strategies will not achieve the maximum system efficiency. [27], considering the saliency ratio and load angle constraints, a new current harmonic evaluation index is proposed, and based on it, the improved CHMPWM guarantees good performance of both current THD and the specific order current harmonics All these control strategies ignore the coupling relationship between motor loss and inverter loss. To acquire a higher system efficiency of a PMSM drive system, The PWM control strategy must take consideration both harmonic components of output voltage and the power loss of power devices in the three-phase bridge inverter. Fourier integral analysis to by analytically calculate the component and harmonics of inverter output voltage, which global motor loss model of the is established.
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