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Renewable sources like solar photovoltaic (PV) are preferred to be operated at low voltages. This necessitates high voltage boosting when they have to be connected to the high voltage DC bus. Conventional DC-DC converters (eg. boost and buck-boost) offer high voltage gain at the cost of reduced efficiency. This paper proposes a novel method to integrate low voltage PV power to the high voltage DC...
Hysteresis current control (HCC) based voltage source converters (VSCs) have several advantages like good dynamic response, over-current protection, insensitive to load parameter variation and ease of implementation. The application of HCC technique for two-level VSCs are well established and few modifications of the same are also reported to operate with variable or constant switching frequency in...
Cascaded H-bridge multilevel inverters (CHB-MLIs) are well accepted for medium and high power grid connected photovoltaic (PV) applications. Independent MPPT and modularity are the advantages of these converters over the diode clamped and capacitor clamped MLIs. However, CHB-MLIs are associated with inter-module leakage current through the parasitic capacitor of PV panels even though an isolation...
Cascaded multicell converter is proved to be an effective solution for medium voltage high power drives. Three-phase diode bridge rectifiers with complex transformer configuration are normally used in this converter, which do not have regenerative capability. Three-phase or single-phase pulsewidth-modulated (PWM) rectifiers are used at the front end to achieve regenerative capability and input power...
A high resolution m-cell Symmetric Cascaded H-Bridge Multilevel Inverter (SCHB-MLI) based on cascade connection of one 5-level Transistor Clamped HB (TCHB) power cell and (m−1) 3-level HB power cells is proposed in this paper. The proposed hybrid converter features reduced number of components, reduced number of redundant switching states, and near equal power distribution among the power cells. Operation...
Reliability of the grid feeding or stand-alone inverter system is a concern. Apart from the power electronic switching devices, DC link capacitors have an impact on reliability of the whole system. Two different PWM switching schemes are analysed for a 3-level DC-DC converter connected to a single phase NPC inverter. To reduce the current stress on DC link capacitors, it is suggested to use inverter...
Among the carrier based pulse width modulation (PWM) techniques, Phase Shifted PWM (PS-PWM) technique is preferred for Cascaded H-Bridge (CHB) multilevel inverters. This technique distributes power evenly among the modules and also ensures equal utilization of inverter switches within a module. On the other hand Carrier Disposition PWM (CD-PWM) technique has superior output voltage profile, but results...
To improve the reliability and efficiency of grid tied inverters, it is suggested to replace some of the fully controllable devices by semi-controllable devices like thyristor. A modification for the HERIC topology is proposed, wherein the upper two switches of inverter leg and additional series connected switches for freewheeling are replaced by thyristors. The efficiency and reliability of full...
Most of the loads found in various commercial installations require front end ac-dc conversion. Various storage systems and renewable sources interact with these loads and the ac grid through dc-ac converters. These multistage conversions reduce system efficiency. To avoid this, an ac distribution system can be replaced by a dc distribution system within a commercial facility. It results in improved...
A new scheme for a 4-level Static Compensator (STATCOM) integrating two 2-Level converters, supplying / absorbing reactive power to / from the grid is proposed in this paper. Reduced component count and simpler layout of switches are the attractive features of the proposed topology over the existing diode clamped multilevel converter. Furthermore, less number of dc links and smaller dc link capacitor...
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