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AC Drives
Published in Warsame Hassan Ali, Samir Ibrahim Abood, Matthew N. O. Sadiku, Fundamentals of Electric Machines, 2019
Warsame Hassan Ali, Samir Ibrahim Abood, Matthew N. O. Sadiku
Nowadays, the thyristor voltage control method is selected for varying the firing angle of the thyristor. Triac is used to control speed variation, this method is also known as the phase angle control method. Additionally, energy consumption can also be controlled by controlling AC power.
Performance Investigations of Novel PWM Control Strategies for Fundamental Fortification in Single-Phase Matrix Converter for Cyclo-Conversion Operation and FPGA Implementations
Published in Electric Power Components and Systems, 2022
S. Thamizharasan, C. Krishnakumar
The matrix converter inherits the capability to work with a variety of control strategies. Numerous control strategies have evolved in the three decades to suit particular applications. At the outreach, phase control methods like the zero firing angle method (ZFAM), constant firing angle method (CFAM) and cosine wave crossing method (CWCM) are very popular [29]. In ZFAM, the power switches are switching at zero firing angles to obtain frequency control while the magnitude remains constant. The output waveform resembles rectified sine wave in each half cycle of the input waveform and the polarity reversal depends on output frequency. Whereas in CFAM, phase angle control is achieved by symmetrical phase delaying in each pulse of output voltage with minimum harmonic distortion. In CWCM, the cosine wave is a carrier that is compared with sine reference to produce variable output voltage with lesser magnitudes of lower order harmonics when compared with ZFAM and CFAM. Though CWCM is a better method than ZFAM and CFAM in terms of harmonic distortion, still there is a need of developing new control strategies that suit to provide enhanced fundamental components with lesser harmonic distortion.
An Isolated Three-Port Interleaved Flyback Boost Converter (ITPIFBC) for Grid-Connected Photovoltaic Applications
Published in Electric Power Components and Systems, 2022
Sivakumar Ranganathan, Krishnamoorthi Kanagaraj
The main objective of this paper is to design a multi-input, single-output interleaved flyback boost converter to interface a finite number of PV sources with the gird/PV inverter. The main objectives of the proposed works are given below To design a multi-input, single-output interleaved flyback boost converter to eliminate the need for a cascaded DC-DC converter.To design a low-cost interleaved flyback boost converter with a reduced number of active power switches.To enhance the boost factor of the conventional interleaved flyback back converter.To propose a Fuzzy Logic Controller (FLC) based maximum power point tracking algorithm with duty ratio control and phase angle control Fuzzy Logic Controller (FLC) based maximum power point tracking algorithm with duty ratio control and phase angle control to extract and regulate the power developed by the distinct PV power sources, independently.
Comprehensive investigation on doubly fed induction generator-Wind farms at fault ride through capabilities: technical difficulties and improvisations
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Preeti Verma, Seethalekshmi K, Bharti Dwivedi
Dynamic Voltage Restorer (DVR) is introduced in (Wessels, Gebhardt, and Fuchs 2011) for injection of necessary reactive power in the grid, so that voltage instability caused due to high penetration of WTs can be handled. It has the capability to store sufficient energy. This stored energy is useful for regeneration of DFIG terminal voltage at fault. DVR provides a phase angle control. It can provide compensation on voltage sag/swell and harmonics. DVR consists of a Voltage Source Converter (VSC), injecting transformer, ESS at the DC side, DC charging circuit, control circuit, and harmonic filter. ESS is used on the DC side of DVR to store the unused wind power. ESS suppresses the power fluctuation and provides active power to protect the DFIG-WT against large interruptions. The DVR is connected in series with DFIG and grid. It is very much efficient on voltage compensation to improve FRT capability in DFIG-WT. Figure 15 shows a DVR connection at PCC which provides an injection of voltage and provide real and reactive power compensation to the grid. DVR rating depends on the fault type and voltage error magnitude at fault (Wessels, Gebhardt, and Fuchs 2011). The power rating of DVR (at voltage sags/swells with zero phase angle jumps) is represented as (26)