The Experts below are selected from a list of 106512 Experts worldwide ranked by ideXlab platform
Naimish Zaveri - One of the best experts on this subject based on the ideXlab platform.
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control strategies for harmonic mitigation and power factor correction using shunt active filter under various Source Voltage conditions
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: Naimish Zaveri, Ajitsinh ChudasamaAbstract:Abstract This paper gives a new insight into the concept of load compensation using shunt active filter (SAF) under ideal and non-ideal Source Voltage conditions. A novel approach based on an improved instantaneous active and reactive current component method is proposed. The performance of the proposed control strategy has been compared with instantaneous reactive power theory, symmetrical component theory and dq theory. SAF has been realized by three-phase Voltage Source converter. Reference currents generated by control strategies has been tracked by a SAF in a hysteresis band control scheme. The performance of the proposed scheme is evaluated in terms of reactive power compensation, reduction in magnitude of Source currents, compensator currents, and harmonic compensation as per IEEE-519 standard. To ascertain the viability of the proposed control algorithm, the performance is evaluated under different Source Voltage conditions with the IEEE Standard-1459 power definitions. Variation in magnitude as well as harmonic content of Source Voltage has been considered. Under balanced sinusoidal Source Voltage condition, all control strategies congregate to similar results. Under unbalanced sinusoidal Source Voltage condition, dq theory and proposed theory have shown similar performance. However, under distorted Source Voltage conditions, an improved instantaneous active and reactive current component theory presents superior performance. A three-phase, three-wire distribution system supplying non-linear load is considered for simulation study. Simulation results from a complete model of SAF are presented to validate and compare the control strategies.
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Load compensation using DSTATCOM in three-phase, three-wire distribution system under various Source Voltage and delta connected load conditions
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: Tejas Zaveri, Bhavesh R. Bhalja, Naimish ZaveriAbstract:Abstract This paper deals with a Distribution STATic COMpensator (DSTATCOM) for balancing of Source currents, power factor correction and harmonic mitigation in three-phase, three-wire distribution system supplying delta connected load under various Source Voltage conditions. The control strategy applied to the DSTATCOM play a major role in its performance. A novel approach based on an improved instantaneous active and reactive current component (IARCC) theory is proposed for generation of three-phase reference currents for DSTATCOM. A three-phase Voltage Source converter with a dc bus capacitor is employed as DSTACOM which will track the reference currents in a hysteresis band scheme. The performance of DSTATCOM is evaluated under sinusoidal, unbalanced sinusoidal and unbalanced distorted Source Voltage conditions. Variation in load current, variation in magnitude and harmonic content in Source Voltage has been considered. Delta connected linear as well as non-linear load conditions have been considered. The performance of the DSTATCOM using the proposed control strategy is demonstrated using simulation results in MATLAB/SIMULINK software. Simulation results demonstrate the feasibility of proposed scheme for the control of DSTACOM.
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Comparison of control strategies for DSTATCOM in three-phase, four-wire distribution system for power quality improvement under various Source Voltage and load conditions
International Journal of Electrical Power & Energy Systems, 2012Co-Authors: Tejas Zaveri, Bhavesh R. Bhalja, Naimish ZaveriAbstract:This paper presents comparison of three different control strategies to generate reference current components for Distribution Static Compensator (DSTATCOM). Reference currents are tracked by a three-phase Voltage Source converter in a hysteresis band control scheme. These methods are instantaneous reactive power (IRP) theory, symmetrical component (SC) theory and an improved instantaneous active and reactive current component (IARCC) theory. The performance of three methods has been evaluated under various Source Voltage and load conditions with new IEEE Standard 1459 power definitions. A comparative study of their performance in terms of rms value of Source current, Total Harmonic Distortion (THD), supply power factor and compensator ratings is also presented. A three-phase, four-wire distribution system supplying linear as well as non-linear load is considered for simulation study which is carried out using MATLAB/SIMULINK software. Under balanced and sinusoidal Source Voltage conditions, all three control strategies similar performance while an improved IARCC theory outperforms, particularly, under unbalanced and distorted Source Voltage conditions.
Myung-joong Youn - One of the best experts on this subject based on the ideXlab platform.
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A Source Voltage-clamped resonant link inverter for a PMSM using a predictive current control technique
IEEE Transactions on Power Electronics, 1999Co-Authors: Young-seok Jung, Myung-joong YounAbstract:A simple Source Voltage-clamped resonant link (SVCRL) inverter is proposed to clamp the DC-link Voltage to the input Source Voltage and reduce the current rating of a resonant inductor. The current control of a permanent magnet synchronous motor (PMSM) employing a predictive current control technique (PCCT) for the SVCRL, inverter is also investigated to overcome the disadvantage of the current-regulated delta modulation (CRDM) control technique. By employing the PCCT based on the discrete model of a PMSM and estimation of back electromotive force (EMF), the minimized current ripple with a small number of switchings can be obtained. Finally, the comparative computer simulation and experimental results are given to show the usefulness of the proposed technique.
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A Source Voltage clamped resonant link inverter for a discrete time current control
PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196), 1Co-Authors: Young-seok Jung, Myung-joong YounAbstract:A Source Voltage clamped resonant link (SVCRL) inverter is proposed to clamp the DC link Voltage to the input Source Voltage and reduce the current rating of a resonant inductor. The current control of a permanent magnet synchronous motor (PMSM) employing a predictive current control technique (PCCT) for the SVCRL inverter is also investigated to overcome the disadvantage of the current regulated delta modulation (CRDM) control technique. By employing the PCCT based on the discrete model of a PMSM and estimation of back EMF, the minimized current ripple with a small number of switchings can be obtained. Finally, the comparative experimental results are given to show the usefulness of the proposed technique.
Young-seok Jung - One of the best experts on this subject based on the ideXlab platform.
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A Source Voltage-clamped resonant link inverter for a PMSM using a predictive current control technique
IEEE Transactions on Power Electronics, 1999Co-Authors: Young-seok Jung, Myung-joong YounAbstract:A simple Source Voltage-clamped resonant link (SVCRL) inverter is proposed to clamp the DC-link Voltage to the input Source Voltage and reduce the current rating of a resonant inductor. The current control of a permanent magnet synchronous motor (PMSM) employing a predictive current control technique (PCCT) for the SVCRL, inverter is also investigated to overcome the disadvantage of the current-regulated delta modulation (CRDM) control technique. By employing the PCCT based on the discrete model of a PMSM and estimation of back electromotive force (EMF), the minimized current ripple with a small number of switchings can be obtained. Finally, the comparative computer simulation and experimental results are given to show the usefulness of the proposed technique.
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A Source Voltage clamped resonant link inverter for a discrete time current control
PESC 98 Record. 29th Annual IEEE Power Electronics Specialists Conference (Cat. No.98CH36196), 1Co-Authors: Young-seok Jung, Myung-joong YounAbstract:A Source Voltage clamped resonant link (SVCRL) inverter is proposed to clamp the DC link Voltage to the input Source Voltage and reduce the current rating of a resonant inductor. The current control of a permanent magnet synchronous motor (PMSM) employing a predictive current control technique (PCCT) for the SVCRL inverter is also investigated to overcome the disadvantage of the current regulated delta modulation (CRDM) control technique. By employing the PCCT based on the discrete model of a PMSM and estimation of back EMF, the minimized current ripple with a small number of switchings can be obtained. Finally, the comparative experimental results are given to show the usefulness of the proposed technique.
Nishant Patnaik - One of the best experts on this subject based on the ideXlab platform.
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Management of reactive power sharing & power quality improvement with SRF-PAC based UPQC under unbalanced Source Voltage condition
International Journal of Electrical Power & Energy Systems, 2017Co-Authors: Anup Kumar Panda, Nishant PatnaikAbstract:Abstract This paper is proposed to establish a new control algorithm for UPQC (unified power quality conditioner) to improve power quality and manage effectively equal reactive power sharing between shunt and series inverter of UPQC under unbalanced Source Voltage condition. The extraction of instantaneous power angle for reactive power sharing faces difficulty with unbalanced Source Voltage condition. This paper presents a new SRF (synchronous reference frame) based PAC (power angle control) method using decoupled load current parameters for efficient utilization and coordination of UPQC inverters. The proposed controller contributes in improvement of Source current and load Voltage harmonic profile, provides efficient way of load reactive power compensation and load Voltage compensation for sag, swell and unbalanced condition. Effect of Source Voltage variations in the form of sag, swell or unbalancing on variable power angle estimation and reactive power calculations are also validated through a mathematical analysis. SRF based PAC control approach and PAC based UVT (unit vector template) control approach is adapted for estimating the reference signals of shunt and series inverter respectively and thus reducing the need of extra computation. The simulation and experimental analysis is carried out using Matlab/Simulink software package for computer simulation and a dSPACE based experimental setup for real time verifications.
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Power quality enhancement with PAC-SRF based single phase UPQC under non-ideal Source Voltage
2015 Annual IEEE India Conference (INDICON), 2015Co-Authors: Anup Kumar Panda, Nishant Patnaik, Ranjeeta PatelAbstract:This paper presents a new PAC-SRF based approach for UPQC to be used in single phase distribution systems. A necessary phase angle shift of load Voltage is introduced with respect to the Source Voltage using the power angle control concept in order to integrate a reactive power sharing feature for series inverter part of UPQC. Synchronous reference frame (SRF) based controller is adapted for both shunt and series inverter parts of UPQC to mitigate distortion in load Voltage and Source current. Various power quality disturbing elements are addressed with this approach such as current and Voltage harmonics, Voltage sag and load reactive power demand. An SRF based approach is more helpful for power calculations under distorted conditions as compared to other control techniques. The entire system is validated by extensive simulation using MATLAB/SIMULINK and real time digital simulator (RTDS).
Kwanghee Nam - One of the best experts on this subject based on the ideXlab platform.
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Source Voltage sensorless estimation scheme for PWM rectifiers under unbalanced conditions
IEEE Transactions on Industrial Electronics, 2003Co-Authors: Hong-seok Song, In-won Joo, Kwanghee NamAbstract:A Source Voltage sensorless estimation scheme is proposed for a pulsewidth-modulation (PWM) rectifier in unbalanced circumstances. The negative sequence is accompanied by the unbalance among phases, and acts as an ac disturbance to a normal-mode estimator and controller. Hence, without considering Voltage unbalance, a PWM rectifier yields a Voltage ripple in the dc-link Voltage and large reactive currents. With the proposed sensorless scheme, both positive and negative components are estimated separately by using a full- (or reduced-) order estimator. The feasibility of the proposed sensorless scheme is confirmed through computer simulation and experiment.
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Source-Voltage-sensorless scheme for PWM rectifier under Voltage unbalance condition
4th IEEE International Conference on Power Electronics and Drive Systems. IEEE PEDS 2001 - Indonesia. Proceedings (Cat. No.01TH8594), 1Co-Authors: In-won Joo, Hong-seok Song, Kwanghee NamAbstract:A simple and robust Source-Voltage-sensorless scheme for a PWM rectifier considering Voltage unbalance conditions is proposed. When a Voltage unbalance occurs in a three-phase system, the unbalance component deteriorates the performance of the Voltage Source estimator by generating AC disturbances. Since the the Source Voltage information is used to control the real/reactive power flow, the inaccurate information causes Voltage fluctuation in the DC-link, the increase of reactive power, and furthermore, instability in a PWM rectifier. In this work, the proposed sensorless scheme estimates the normal components and the unbalance components of the Source Voltage separately by using a modified reduced-dimensional estimator. The use of the measurement's derivative quantity sensitizing the estimator to measurement noises is avoided by introducing an auxiliary variable. Thus, the proposed sensorless scheme yields better robustness to measurement noises, and it works well even in the transient state. The feasibility of the proposed sensorless scheme is confirmed through computer simulations and experiments.
