Dynamic dc voltage regulation of split‐capacitor DSTATCOM for power quality improvement

Self Cite

Summary The current quality of the utility in distribution system is improved by using distribution static compensator (DSTATCOM). The voltage source inverter (VSI) of DSTATCOM is connected to utility through an interfacing inductor for smoothing the current. But the required inductance value is high in conventional DSTATCOM. Due to this, the requirement of DC‐link voltage of VSI is increased to improve the current quality. In this paper, a hybrid DSTATCOM topology is proposed to reduce the inductance value, which will reduce the requirement of the DC‐link voltage. In conventional hybrid DSTATCOM, DC‐link voltage is maintained to a fixed value; due to this, the switching losses is more under the reduced load conditions. In order to minimize the switching losses, a variable DC‐link voltage control is proposed, which is based on the ac series capacitor voltage and the compensation performance. The effectiveness of the proposed method is validated by simulation and experimental studies.

“…Also, the following disadvantages are observed in the above method. 16 1. The transient response of the dc-link voltage is still poor.…”

Section: Dc-link Voltage Reference Selection In Existing Methodsmentioning

confidence: 99%

Section: Proposed Variable Dc‐link Voltage Control For Hybrid Dstatcommentioning

confidence: 99%

Section: Vsi Side Interfacing Inductor (L F1 )mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Power quality enhancement by hybrid DSTATCOM with improved performance in distribution system

Myneni

Ganjikunta

Sreenivasarao

2019

Self Cite

“…12 Few researchers focused on pulse width modulation (PWM) techniques so as to minimize switching loss in the converter. [13][14][15][16] System performance is evaluated by Iyer et al 17 for different VSC topologies and the comparison of various control strategies is performed by Zaveri et al 18 On the other hand, design criteria for interfacing filter is reported by Kumar and Mishra 19 and Kumar et al 20 to enhance the performance of the compensator and to minimize the power loss.…”

Section: Introductionmentioning

confidence: 99%

Angle measurement–based compensation methodology to mitigate voltage unbalance in a distribution system

Kallamadi

Chhabhaya

Shah

2019

Summary The objective of this article is to compensate the deviations in magnitude and phase shift of load terminal voltage in an unbalanced low‐voltage distribution system. In specific, power balancing at the load terminal is accomplished through a compensator. A separate single‐phase full bridge voltage source converter (VSC) is employed in each phase to mitigate the system unbalance. The desired active and reactive power exchange of VSC with the system is accomplished with a simplified control methodology that considers terminal magnitude and angle measurements. The performance of the proposed method is compared with well established d‐q–based control methodology. The functionality of the compensator and its applicability is verified through a detailed case study.

Design, analysis, and switching losses reduction of hybrid shunt compensator with adaptive control scheme

Myneni

Ganjikunta

2020

Self Cite

Summary In distribution system, the power quality is improvised by connecting a hybrid shunt compensator at the load end. In this paper, the design analysis of hybrid shunt compensator parameters is presented for smooth filter current tracking. This design eliminates the requirement of an extra ripple filter at Point of Common Coupling (PCC), in case of non‐stiff source. The performance of the compensator mainly depends on dc voltage of Voltage Source Converter (VSC), and it will be affected during load variations. To improve the performance of dc voltage, an adaptive control scheme is proposed. The proposed method improves the steady state and transient performances, and also having low Total Harmonic Distortion (THD) of source current in steady state condition. Also, the control scheme reduces switching losses and switching stress by maintaining more appropriate dc voltage corresponding to load point. To show the performance of the proposed algorithm, simulation and experimental studies have been performed.