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When the vector control is performed using PWM three phase inverter in AC motor drive system, three phase current are obtained by measuring voltage between shunt resistors. The PWM inverter obtaining three phase current by shunt resistor is comparatively cheaper than the method that measures three phase current by Current Sensor. And it reduces the size of AC motor drive system. However, the method...
This paper presents the electric vehicle(EV) system using module balancing method in vehicle-to-grid(V2G) system. Since there are intrinsic discrepancies among batteries, the state of charge(SOC) of each battery after charging or discharging may not be the same. Consequently, the batteries are with different voltages during the charging and discharging process. As a result, over-charging or over-discharging...
In this paper, electric vehicle (EV) system using bi-directional DC-DC converter which can control the type of low-voltage and high-current battery is proposed. Proposed system uses isolated DC-DC converter for voltage compensation. The proposed topology has a form in which the inputs are connected in parallel and the outputs are connected in series in battery and isolated converters. The basic concept...
In this paper, interpolation error compensation method for look-up table(LUT) based IPMSM(Interior Permanent Magnet Synchronous Motor) drive is proposed. Generally, the LUT based IPMSM drive is widely used on automotive application because of its reliable current control. However, the LUT data is memorized discreetly, so the linear interpolation method is used for the absent data condition. Because...
In the EV system operating regenerative mode without bi-directional DC-DC converter, 3-phase PWM inverter should charge the battery. At this time, regenerative torque reference for braking has to output torque reference in order to charge the battery. This paper proposed the regenerative control method controlling the voltage and current of battery through the regenerative power control at regenerative...
FCEV (Fuel cell electric vehicle) is provided with energy for operating the motor from the fuel cell. But fuel cell is impossible to be charged at the regenerative mode and also, it has slow dynamic characteristics. So, additional battery is essential as an auxiliary power source in FCEV system. The output current of the VSI (Voltage Source Inverter) is distorted due to the dead-time and the delay...
This paper presents torque ripple analysis in discontinuous region which is caused by the minimum pulse width duty. Generally, IGBT gate voltage requires threshold voltage when the switches are turned on and off. However, gate driver has series connected resistor and parallel connected capacitor, these parasitic components generate time delay for reaching the threshold voltage. This time delay causes...
This paper presents the control methods of torque when interior mounted permanent magnet synchronous motor (IPMSM) for electric vehicle is in regenerative mode. The current control of IPMSM is generally performed by the Lockup-table to output the most suitable current order which is to make the unit torque like maximum torque per ampere (MTPA). At the electric vehicle system, the regenerative control...
This paper proposes a dc-dc converter compensating for PV cell output voltage of residential photovoltaic generation system. It is possible to compensate for the voltage drop due to temperature rise, using 600W isolated dc-dc converter for 3kW residential PV cell system. To verify the proposed system, the system operation is verified through simulation.
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