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Current source inverter (CSI) offers key merits of direct output current control, voltage gain operation, current limiting ability, and inherent short-circuit protection. The modulation and control for medium voltage high power application are implemented at low device switching frequency in order to attain high efficiency and to reduce cooling requirements. At low switching frequency operation, the...
This work involves design of an agent based energy auction market mechanism to include storage systems in an interconnected microgrid network using Multi Agent System (MAS) approach. The power system component of a microgrid is modelled using OpenDSS for a standard IEEE distribution network and the communication part is modelled using Java Agent Development Environment (JADE). The communication between...
At present, the field of power factor corrected (PFC) rectifiers are very much matured. Typically a single phase PFC converter requires measurements from three independent sensors i.e. input voltage, input current and output voltage. By considering a need of farther compact and more flexible in terms of input to output voltage gain, a new UPF rectifier with two buck-boost converter operating in interleaved...
In high power applications such as static synchronous compensator (STATCOM) used for reactive power compensation, it is essential to reduce semiconductor losses and associated cost to a minimum value while maintaining desired key attributes. This paper presents a new hybrid switching STATCOM that addresses the semiconductor device losses while ensuring the usual STATCOM operating criterion. Design...
This paper investigates the effect of reconfiguration and network type (mesh/radial) on small signal stability margin of a droop-based islanded microgrid. A low voltage microgrid and standard IEEE 33 bus system (with three and five sources) are considered for study. From eigenvalue analysis and root locus plot, it is found that the reconfiguration and network type has significant effect on small signal...
This paper presents dynamic model and stability analysis of droop based AC/DC Hybrid microgrid. The power electronic interface on ac side of the microgrid consist of voltage source inverters and the dc side constitute of dc/dc converters. The developed model is linearised at an operating point to investigate the stability analysis of this hybrid system. Effect of stability margin with droop gain is...
Three-phase inverters in UPS, electric vehicles or hybrid electric vehicles use dc link electrolytic capacitor to establish an intermediate dc link, which has reliability issues and is one prominent cause of inverter failure. Large volume of electrolytic capacitor increases size and cost of the system. Recent research on electrolytic capacitorless inverter using six pulse modulation (SPM) technique...
Multilevel converters (MLC) have emerged as standard power electronic converters in high power as well as quality demanding applications. Voltage-fed MLCs have been widely researched whereas the current-fed (CF) MLCs are the recent topic of research. CF-MLC offer several advantages in terms of high power capability, transformer-less operation, short circuit protection and excellent quality of output...
The Dual Active Bridge (DAB) topology is ideally suited for high-power dc/dc conversion especially for energy storage applications. Due to the low current ripple and higher conversion requirements, Current-Fed DAB (CFDAB) with secondary-side modulation is implemented to avoid the voltage spike across parasitic capacitance of Low Voltage (LV) switches. This paper details Phase Shift Modulation (PSM)...
The first dual multilevel converter (MLC) topology for medium-voltage (MV) open-end stator winding induction motor (OESW-IM) drives was proposed in 1990s. Till now, MLC topologies to generate three-level, five-level, seven-level, and nine-level voltage waveforms for OESW-IM drives have been proposed. This paper proposes a new topology for OESW-IM drives based on modular multilevel converter (MMC)...
This paper presents a novel modulation technique for a three-phase dc-dc converter with bi-directional power transfer capability. The topology is geared towards dc microgrid and fuel cell vehicle applications, where a high step-up ratio converter is required to enable efficient energy exchanges between two dc buses of different voltage magnitudes. The proposed converter achieves zero-current switching...
Current fed multilevel converters have several advantages in terms of high power capability, transformer less operation, short circuit protection and excellent quality of waveforms. For high power applications, these converters are required to be operated under low device switching frequency to necessitate thermal constraints of the semiconductor devices. However, the converter output currents under...
In high power conversion, low device switching frequency operation is preferred in order to satisfy the thermal constraints of the semiconductor devices and also to improve efficiency. However, low device switching frequency operation leads to higher total harmonic distortion (THD) of the converter output currents. Synchronous optimal pulse-width modulation (SOP) technique is an emerging low device...
The proposed converter has the following features: 1) zero current commutation (ZCC) and natural voltage clamping (NVC) eliminate the need for active-clamp circuits or passive snubbers required to absorb surge voltage in conventional current-fed topologies; 2) Switching losses are reduced significantly owing to zero-current switching (ZCS) of primary side devices and zero-voltage switching (ZVS) of...
Synchronous optimal pulsewidth modulation (SOP) is an emerging modulation technique for medium voltage industrial AC drives. SOP modulates multilevel converters with low device switching frequency while maintaining the quality of machine stator currents. The goal of our study is to implement SOP technique for cascaded nine-level (9L) inverter with average device switching frequency limited to rated...
Modular multilevel converter (MMC) is now the state-of-the-art converter topology for high power applications. MMC topology has been commercially introduced in high-voltage dc transmission (HVDC) converter systems as well as medium-voltage (MV) industrial AC drives. To limit overall device losses in high power applications, the device switching frequency of power semiconductor devices should be limited...
This paper presents a comparative study of double-ended isolated full-bridge, half-bridge, and push-pull high frequency (HF) transformer isolated microinverter topologies for solar photovoltaic AC module (SPVAC) application. In the proposed microinverters, a simple Sinusoidal Pulse Width Modulation (SPWM) is employed for front-end devices, whereas the half-bridge cycloconverter devices on secondary...
Micro-grids with energy storage elements are a reliable solution for the stochastic nature of the renewable energy sources, conventional grids and load fluctuations. Hence, a three-phase current-fed full-bridge dual-active bridge (DAB) bidirectional dc-dc converter with current-fed inverter at Low Voltage Side (LVS) and voltage-fed rectifier at High Voltage Side (HVS) is proposed to integrate the...
A snubberless current-fed push-pull dc/dc voltage doubler is proposed with zero voltage switching (ZVS) turn-on of low voltage current-fed devices by using the parasitic resonance between the drain-source capacitance of MOSFETs and the leakage inductance of the high frequency transformer. Secondary modulation helps reduce switching losses further by obtaining zero current switching (ZCS) turn-off...
A bidirectional current-fed three-phase pushpull dc/dc converter is proposed for DC micro-grid application. The proposed converter is analyzed and designed to interface two dc buses of 48 V and 380 V in a microgrid. An innovative novel modulation technique is proposed to clamp the device voltage spike across primary side current-fed devices at turn-off solving traditional problem. The proposed modulation...
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