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The increased use of power electronics based equipment, nonlinear loads and the changing power system regulations has made power quality (PQ) an important issue. The changed load condition has increased the proliferation of non-stationary PQ disturbances such as; voltage sag, swell, momentary interruptions, transients, along with the stationary harmonics. The conventionally used Fourier transform...
The six-leg DSTATCOM is used for suppression of harmonics and regulation of terminal voltage. The proposed algorithm is based on IcosФ control algorithm for DSTATCOM which uses unit templates instead of phased locked loop (PLL) to generate cosθ and sinθ to reduce the execution time. The six-leg IGBT based VSC when compared with three-leg IGBT uses unipolar switching, which will double the PWM switching...
This paper presents a single-phase Power Factor Corrector (PFC) based on the Sheppard-Taylor topology suitable for welding applications. In order to ensure unity power factor at the input AC mains, a Pulse-Width-Modulated (PWM) control is developed. The input inductance of the proposed converter works in discontinuous current mode (DCM). Major favorable features of this converter like inherent short-circuit...
This paper proposes a new scheme to generate reference voltage for a existing DSTATCOM operating in voltage control mode (VCM). The proposed method provides DSTAT-COM an energy conservation (EC) feature while enhancing its power quality (PQ) improvement capability without using any extra circuitry. With this scheme, power drawn by the load decreases which reduces the tariff, reduces heating losses...
In this paper, the multiresolution analysis technique is applied to detect and localize different Power Quality (PQ) disturbances. Ten types of PQ events such as voltage sag, swell, interruption, harmonic, sag with harmonics and swell with harmonics, notch etc are analyzed using both Discrete Wavelet Transform (DWT) and Second Generation Wavelet Transform (SGWT). Each signal is decomposed upto four...
Power distribution in weak grid areas has a large number of power quality problems which include sag, swell, flicker etc. Each of the power quality issue has negative effect on the life and operation of sensitive loads like television, power drives, displays, lighting loads. This paper presents dual function solar inverter to mitigate power quality events in solar distributed generation system connected...
This paper presents a dual voltage source inverter (DVSI) scheme for microgrid system, which enhances the power quality and reliability of the microgrid system. The scheme comprises of two inverters namely the main inverter (MVSI) and the auxiliary inverter (AVSI). The DVSI scheme enables the microgrid to exchange power generated by the distributed energy resources (DER) to the loads and in addition...
This paper proposes Interline Dynamic Voltage Restorer (IDVR) to mitigate voltage sag, while its DC link energy is restored by phase shifting transformers. The Dynamic Voltage Restorer (DVR) was proposed as a solution to Voltage Sag compensation involving considerable amount of real power injection into the system which entirely depends on the energy storage capacity of DVR thus limiting its capabilities...
A PFC (Power Factor Correction) based singlestage, single-switch SC (Switched-Capacitor) buck-boost converter is proposed to feed BLDC (Brushless DC) motor drive. The speed of proposed drive is controlled by varying the DC link voltage of VSI (Voltage Source Inverter) feeding BLDC motor. Moreover, the BLDC motor is electronically commutated which has reduced switching losses in VSI. The SC buck-boost...
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