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ac/dc Converters
Published in K Sundareswaran, Elementary Concepts of Power Electronic Drives, 2019
This chapter discusses different circuit topologies and operational characteristics of ac/dc power converters, which are commonly labeled as controlled rectifiers. These power converters convert existing ac supply in to dc voltage of controlled amplitude. Silicon-controlled rectifiers (SCRs) are employed as switching elements, and commutation of these SCRs takes place with the help of input line voltage so that additional commutation circuits are not necessary. These converters are classified as single-phase and three-phase converters based on availability of single-phase or three-phase power supply. The ac/dc converters are also categorized as semi-converters or full converters; semi-converters are single-quadrant converters, whereas full converters operate in two quadrants of the V-I diagram. Line-commutated ac/dc converters are used for variable-speed operation of dc motors, high-voltage dc transmission (HVDC), battery charging, and front-end feeders to inverter circuits.
Power Quality
Published in Maurizio Cirrincione, Marcello Pucci, Vitale Gianpaolo, Power Converters and AC Electrical Drives with Linear Neural Networks, 2017
Maurizio Cirrincione, Marcello Pucci, Vitale Gianpaolo
The classic control strategy for SAFs is based on the p-q theory [7]. The complete control scheme with the electric scheme typical of a three-phase three-wire system is drawn in Figure 3.28. It is based on three single-phase converters with common DC link capacitor. The underlying assumption is that no zero-sequence current component exists. The goal of the control action is to generate a set of voltages to compensate the harmonic load voltage components which are the cause of oscillating active and reactive power components on the load side. Such a control scheme permits the grid voltages and currents to have pure sinusoidal waveforms.
Highly Efficient BBFIC for Grid-Connected Photovoltaic-Battery Energy Storage System Using Hybrid Optimization Assisted Framework
Published in Cybernetics and Systems, 2022
Manimaran Naghapushanam, Baskaran Jeevarathinam, Padmanathan Kasinathan
The TSBB converters switch to different modes like “buck-boost, boost or buck” for optimizing the control policy and its effectiveness when only two semiconductors are necessary to make up the topology (Zhao, Zhang, and Wu 2017). Due to their numerous outputs and low power consumption, flyback converters are frequently employed (Chen, Zheng, and Xiao 2018). Flyback converters are frequently employed in a variety of settings, particularly in LED drivers and battery chargers (Wu and Zhu 2017). Due to their great efficiency, favorable power factor, and little output voltage ripple, three-phase converters are typically utilized in high power applications (Gangavarapu, Rathore, and Khadkikar 2020). A SSBB converter, on the other hand, only functions in buck-boost modes. The TSBB converter places low voltage stresses on the semiconductor. Nevertheless, the existing TSBB converter has a large power loss than the SSBB converter due to additional semiconductors (Chen and Liu 2020; Kim 2020; Moon et al. 2017; Beno et al. 2014).