Input switched closed-loop single phase SEPIC controlled rectifier with improved performances

Abstract

DC power supply has become the driving source for some essential modern applications. Thereby, DC power conditioning has become a significant issue for engineers. Typically used rectifiers associated with a bridge structure is nonlinear in nature. Thereby, the current at input side of the rectifier contains harmonics, which also flow through the power line. The presence of harmonics causes several interruptions and reduce power quality. In this regard, a new close loop SEPIC controlled rectifier is proposed in this paper. The conventional scheme is arranged with a rectifier connected to a DC-DC converter, which is an open loop system. Consequently, such system cannot regulate voltage at load varying condition. The proposed SEPIC controlled rectifier can regulate voltage under load varying condition for a wide range. Additionally, the performance in terms of total harmonic distortion (THD) of input current and power factor at AC side are also within satisfactory range for the closed loop configuration. The controlled rectifier has four operating phases associated with switching states and input voltage polarity. The close loop configuration also incorporates a current and a voltage loop at the feedback path. The comparative studies have been performed among the proposed closed loop construction, the open-loop structure as well as the conventional construction. The effectiveness of the proposed controlled rectifier is verified in terms of THD and input power factor considering the results obtained from simulation.

A review on techniques for improving power quality: research gaps and emerging trends

“…About 22% of India's generated power is lost in transmission and distribution. As a result, many scholars, academics, and businesspeople have focused on these issues over the last fifteen years [51]- [57]. As part of the collected work done on the topic, this study provides a taxonomy of power performance improvement approaches and control tactics for distribution systems with and without DGs.…”

“…Better PQ [29] Power quality APF Improved power quality [30] Power quality Superposed control strategies Enhanced power quality [31] Power quality uv-pi and pr-r controller Improvement in PQ [32] Power quality icosѲ control algorithm Refined power quality [33] Power quality DSTATCOM along with variable DC link voltage control Improved power quality [34] Power quality PSO assisted kalman filterbased SAPF Enhanced power quality [35] Voltage regulation Power theory hysteresis current control scheme Improved voltage regulation [36] Load growth WIPSO-GSA algorithm Optimal DG installation problem was solved [37] Power quality SAF Harmonics are eliminated [38] Power quality Fuzzy controller Enhanced power quality [39] Power quality Centralized energy management approach Improved power quality [40] Power quality ANFIS-UPQC Enhanced power quality profile [41] Wind farm power quality ANN-controlled hybrid filter Improved power quality [42] Power quality Switched filter compensator Enhanced power quality [43] Power quality PMSM based adjustable speed drive (ASD) load Enhanced power quality [44] Power quality UPQC Enhanced power quality [45] Power quality Adaptive noise reduction control Enhanced power quality [46] Capacitor placement and power quality PSO Optimized capacitor placement and improved power quality [47] Power quality Voltage regulation techniques Improved power quality [48] Power quality Hybrid power filters Improved power quality [49] APF FPSO Improved APF [50] Voltage stability Voltage control technique Enhanced voltage stability and maximized DG utilization [51] THD SEPIC controlled rectifier SEPIC-controlled rectifier is applicable for a wide variety of loads [52] Power quality THD AC to DC ĈUK converter Proposed arrangement regulates the output voltage and maintains a high-power factor [53] Power quality DSTATCOM PQ theory Diode-clamped structure makes the power quality of a multilevel DSTATCOM structure better [54] Power quality Dynamic voltage restorer Gray wolf optimizer Butterfly optimizer…”

Mitigation of harmonic distortions in third rail electrical systems

“…In urban and suburban areas that typically adopt direct current (DC) third rail systems [1]- [3], the rolling stocks are powered by a 33 kV medium-voltage (MV) distribution network through rectifiers [4]- [6]. The abundant usage of rectifiers in the third rail systems can cause severe harmonic distortion [7]- [9]. Harmonic distortions give rise to many technical issues including degradation of transformers [10], [11] and electric motors [12], low power factor, malfunction of protective relays, increase of power losses, resonance [13], [14], and interference to communication devices [15].…”