Sharp LC resonance peak may enlarge inherent harmonics, dominant harmonics of the supply voltage generated by a three-phase diode rectifier, around frequency, which will intensify fluctuations dc-link voltage, and grid currents in motor drives with small capacitor. In this article, novel suppre...

Abstract: Active Power Filter (APF) is capable of changing the size and frequency of harmonics as well as changes in reactive power compensation. It is important to control the stability of the DC-link capacitor voltage stability for it. For DC voltage controls of APF, there are two important achievements. First, it is indicated that the control of DC voltage directly affects the compensation p...

Thepurpose of this study was to determine the link between induction voltages from various electrical loads. We used a residual current device (RCD) circuit that operates with capacitor as DC voltage reading tool. The reads value o

This letter proposes a control strategy for reducing ripple current in DC-link capacitor of single-phase uninterruptible power supplies (UPS). The proposed method aims to reduce the by difference between input and output instantaneous power. waveform should satisfy harmonic regulation be as close possible load current. Therefore, an auxiliary buck chopper was added compensate capacitor. Experim...

High-voltage and power capability of multilevel converters better used for unified power-flow controller (UPFC application). The three-level neutral-point-clamped (NPC) converter allows back-to-back connection as the UPFC shunt and series converters than other multilevel topologies. In place of the pulse width-modulated (PWM) multilevel control schemes, constant dc-link voltage and balanced vol...

A three-phase four-leg inverter-based shunt active power filter (APF) is proposed to compensate three-phase unbalanced currents under unbalanced load conditions in grid-connected operation in this study. Since a DC-link capacitor is required on the DC side of the APF to release or absorb the instantaneous apparent power, the regulation control of the DC-link voltage of the APF is important espe...

This paper introduces a simplified inverter circuit using single dc source and an H-bridge with least possible number of “switching devices”. topology does not employ multiple “dc sources”, which enhances the reliability configuration. The consists two parts, namely: “Level generation parts” as well “Polarity parts”, it is mixture some switching devices, DC-link capacitor DC completes part leve...

Generally uninterruptible power supply (UPS) is used to maintain a stable electric power supply to critical loads with high quality power protecting them against unexpected power failure. For example, medical facilities and data-storage computer systems require fast response, compensation and immediate availability of electrical power. Considerably affect these characteristics is energy storage...