Chanook Hong

Learn More
This paper proposes an on-line rotor time constant estimation method for an indirect field oriented induction machine. The performance of indirect field oriented control is dominantly dependent on the rotor time constant which is varying according to the temperature. Therefore, the on-line rotor time constant estimation is inevitable to guarantee a(More)
We present the development of a water-cooled heat sink that provides reliable thermal performance for high-power IGBT inverter. The development process comprises three stages. In the concept design, the thermal performances of two design proposals are considered. The thermal system of each design is particularly analyzed using the compact model. In the(More)
In this paper, it is described how the circulating current flows between inverters which have isolated DC-link such as Cascaded H Bridge (CHB) topology, when they operating in parallel. In this case, Zero Sequence Circulating Current (ZSCC) flowing through shared DC-link cannot flow between inverters in parallel. However, circulating current is provoked by(More)
This paper describes DC link voltage control method of single phase back-to-back converter for medium voltage motor drive system. Cascaded H-Bridge (CHB) topology is widely used to achieve medium voltage operation and low harmonic distortion, simultaneously. Each power cell of CHB should have the isolated DC link voltage by using input transformer and(More)
Electric machine drive systems have a protection mechanism for momentary power interruption. Generally, when the momentary power interruption is occurred, outputs of a drive system are stopped for the protection. For stable continuous operation, it is sometimes required the restarting strategy which is called as a flying start when the input power is(More)
This paper proposes a control strategy for a sensorless torque control when an induction machine is driven with the adaptive full-order observer. In low speed and low torque reference region, the magnitudes of stator voltage and current which are the inputs of the adaptive full-order observer for the sensorless control are too small. And, the frequency is(More)
PWM strategy is classified into a Continuous PWM (CPWM) and a Discontinuous PWM (DPWM). Because the conventional DPWM has constant non-switching period which is 120° of fundamental period, DPWM could bring about the high Total Harmonic Distortion (THD) compared to CPWM and the lower switching loss than CPWM. This paper presents a carrier-based(More)
In this paper, it is described how the circulating current flows between inverters that have isolated dc link such as cascaded H-bridge (CHB) topology when they are operating in parallel. In this case, zero sequence circulating current, which normally flows through shared dc link, cannot flow between inverters in parallel. However, circulating current is(More)
  • 1