Jong-Sun Ko

CIM based soft switching of energy recovery sustain driver for AC PDPs with reduced sustain voltage

AC-PDP (plasma display panel) uses a high sustain voltage and its power consumption is also high so that circuit cost is expensive. An energy recovery circuit for AC-PDPs with reduced sustain voltage was proposed to solve these disadvantages. However, the circuit has disadvantage that the switching elements are operated with hard-switching at the start point of discharge. The reason is that the panel voltage is lower than sustain voltage at that point. In this paper, we propose the improved driving method that switching devices are operated with soft-switching by using CIM (current injection method). Finally, the validity of the proposed driving method is verified by simulations and experimentation.

Precision Position Control of PMSM Using Neural Network Disturbance Observer on Forced Nominal Plant

This paper presents a neural network (NN) torque observer that is used to deadbeat load torque observer and regulation of the compensation gain by parameter estimator. Therefore, the response of PMSM (permanent magnet synchronous machine) follows that of the nominal plant. The load torque compensation method is composed of a neural deadbeat observer. To reduce of the noise effect, the post-filter, which is implemented by MA process, is proposed. The parameter compensator with RLSM (recursive least square method) parameter estimator is suggested to increase the performance of the load torque observer and main controller. The proposed estimator is combined with a high performance neural torque observer to resolve the problems. As a result, the proposed control system becomes a robust and precise system against the load torque and the parameter variation. A stability and usefulness, through the verified computer simulation and experiment, are shown in this paper

New configuration of 36-pulse voltage source converter for STATCOM application

This paper proposes a new configuration of 36-pulse voltage source converter for STATCOM application, composed of two 6-pulse bridges and a pulse-interleaving auxiliary circuit. The converter topology was devised to increase the number of pulses of the output voltage without increasing the number of 6-pulse bridges and coupling transformers. The operational feasibility of proposed system was verified by computer simulations with PSCAD/EMTDC software and experimental works with 2 kVA hardware prototype. The proposed converter can be widely used for the power quality compensator and the distributed power generation, such as solar and fuel cell power system

Precision Position Control of PMSM using Neural Network Disturbance Observer and Parameter Compensator

This paper presents neural load torque observer that is used to deadbeat load torque observer and gain compensation by parameter estimator. As a result, the response of the PMSM (permanent magnet synchronous motor) follows that nominal plant. The load torque compensation method is composed of a neural deadbeat observer. To reduce the noise effect, the post-filter implemented by MA (moving average) process, is adopted. The parameter compensator with RLSM (recursive least square method) parameter estimator is adopted to increase the performance of the load torque observer and main controller. The parameter estimator is combined with a high performance neural load torque observer to resolve the problems. The neural network is trained in on-line phases and it is composed by a feedforward recall and error back-propagation training. During the normal operation, the input-output response is sampled and the weighting value is trained multi-times by error back-propagation method at each sample period to accommodate the possible variations in the parameters or load torque. As a result, the proposed control system has a robust and precise system against the load torque and the parameter variation. A stability and usefulness are verified by computer simulation and experiment

A study of the train running simulation for train propulsion system performance analysis

The aim of the paper is to analysis on train propulsion system and to study for energy saving. For this study, we make the program that simulates actual operation of the train route to get same experiment result. The train running simulation is performed from starting station to 4th station by using the route data of Deajeon city Metro Subway. The study for control method of electrical motor and energy recovery to save energy is selected. The train propulsion system is constituted as a M-G Set, which is realized via Space Vector Modulation(SVM) - Direct Torque Control(DTC), the energy consumption during train operation and energy recovery during breaking is simulated by Simplorer program. From this result, the energy consumption and recovery of train with SVM-DTC is studied.

Matrix converter with a novel general commutation strategy

A novel general commutation strategy is proposed for n-phase to m-phase matrix converter applications. The proposed circuit with a simple RC snubber as commutation aid requires no extra sensing information allowing conventional dead time commutation. In this paper, detailed commutation procedure of the proposed circuit is analyzed; the choice of specific semiconductor switches and snubber components is also derived and given. The operation of the proposed circuit is very stable, reliable and robust. Finally, experimental results support the validity of the proposed structure and circuit.

Development of simulator for DFIG-based wind turbine

The main goal of this paper is to simulate a doubly-fed induction generator (DFIG), which is similar to a real system. Wind velocity data is applied to a 2D lookup table as a speed reference for an induction motor instead of the turbine. A real electric machinepsilas parameters are put in the simulator to get some results of the real system. The Matlab have been generally used to simulate DFIG, but it has some differences from the real system and is difficult to implement. A Simplorer simulator, however, simplifies DFIG simulation. A space vector modulation (SVM) is accepted to control a driver of an induction motor, which plays a part of the turbine. It is possible to retrieve important information, like a generated power and wind quality etc., from the simulator without a huge wind turbine.

A New Energy Recovery Sustaining Driver for AC PDPs with Reduced Sustain Voltage by Half

This paper proposes a new sustaining driver for AC PDPs(Plasma Display Panels) with reduced sustain voltage by half, which improves the performance of conventional circuits such as TERES(TEchnology of REciprocal Sustainer). In the TERES circuit, the sustain voltage is the half of general sustaining driver, however, there is no energy recovery circuit. In the proposed circuit, energy recovery circuit is added and zero voltage switching or zero current switching is performed in switching devices. Although the energy recovery circuit is added, the number of active switching elements is the same as that of the TERES circuit. The operations of the proposed circuit are analyzed for each mode and its validity is verified by the simulations and experimentation.