Category Archives: MatLab Projects

Vector-Controlled Voltage-Source-Converter-Based Transmission Under Grid Disturbances

Abstract:

Voltage-source converter (VSC)-based transmission systems have attractive potential features in terms of power flow control and stability of the network. Although relatively low switching frequency operation of high-power converters (9-15 times the line frequency) is desirable, it makes them sensitive to power network imbalances when they may be needed the most.

Sensitivity-Analysis-Based Sliding Mode Control for Voltage Regulation in Microgrids

Abstract:

This paper presents a sliding mode controller to address the problem of voltage regulation in microgrids involving doubly fed induction wind generators (DFIGs). The control objective is to achieve terminal voltage regulation while ensuring maximum power point tracking (MPPT). The control development is based on voltage sensitivity analysis to eliminate the possibility of interference with the other voltage regulation devices in the microgrid. The proposed method:

Improving the Dynamic Response of a Flying-Capacitor Three-Level Buck Converter

Abstract:

This study presents a modified flying capacitor three-level buck dc-dc converter with improved dynamic response. First, the limitations in the transient response improvement of the conventional and three-level buck converters are discussed. Then, the three-level buck converter is modified in a way that it would benefit from a faster dynamic during sudden changes in the load. Finally, a controller is proposed that detects load transients and responds appropriately.

High-Efficiency Digital-Controlled Interleaved Power Converter for High-Power PEM Fuel-Cell Applications

Abstract

A high-efficiency digital-controlled interleaved dc-dc converter is designed and implemented to provide a regulated high voltage output for high-power proton-exchange-membrane fuel-cell applications. Ripple cancellation on input current and output voltage can be achieved by the studied interleaved dc-dc power conversion technique to reduce hysteresis energy losses inside the fuel-cell stacks and meet battery charging considerations on the high-voltage dc bus.

High-Efficiency DC–DC Converter With Fast Dynamic Response for Low-Voltage Photovoltaic Sources

Abstract

This paper proposes a high-efficiency dc-dc converter with fast dynamic response for low-voltage photovoltaic (PV) sources. The voltage stress of power switches is reduced at low-voltage side. Zero-current turn-off of output diodes is achieved at high-voltage side. Power efficiency is improved by reducing switching power losses. A modified proportional and integral controller is also suggested to achieve fast output voltage control.

Grid connected single phase rooftop PV system with limited reactive power supply

Abstract:

Photovoltaic (PV) systems proposes attractive alternative source of generation because these can be placed near to the load centers when compared with other renewable source of generation. It is therefore rooftop PV is the centre of attraction for majority PV systems. The rooftop PV system in general is grid connected and supports the off grid load with battery backup. The designed system must ensure total evacuation of generated power and with high efficiency of conversion, and utilizes the resource adequately to maximize the utilization of energy.

Design, analysis and simulation of linear controller of a STATCOM for reactive power compensation on variation of DC link voltage

Abstract:

The STATCOM (STATic synchronous COMpensator) is a shunt connected voltage source converter using self-commutating device and can be effectively used for reactive power control. Its principle of operation is similar to that of a synchronous condenser. This paper describes the modeling of STATCOM along with the design of linear current and voltage controllers. The design of controllers for the converters can be realized in two ways.

Common-Mode Voltage Reduction Pulsewidth Modulation Techniques for Three-Phase Grid-Connected Converters

Abstract:

This paper experimentally investigates the performance of three-phase voltage source pulsewidth modulation (PWM) converter, with the grid interfaced photovoltaic energy conversion system being the main application. In such applications the ground leakage current [common mode current (CMC)] should be much less than an ampere and this is difficult to obtain in transformerless (direct) connected systems. With the target being the reduction of the common mode voltage (CMV) and CMC, the converter performance is investigated thoroughly.

Characteristic evaluation for bi-directional DC-DC converter with soft switching

Abstract:

In recent years, power generation utilizing solar power or wind power which generation ripple is large has been being great attractive for effective utilization of electrical energy. This report presents an evaluation of an isolated bi-directional DC-DC converter composed of a bi-directional boost chopper circuit and full-bridge-type LLC converter.

Applying coupled inductor to step-up converter constructed by KY and buck-boost converters

Abstract:

In this paper, a novel high step-up converter is presented, which combines one charge pump and one coupled inductor with the turns ratio. The corresponding voltage gain is greater than that of the existing step-up converter combing KY and buck-boost converters. Since the proposed converter possesses an output inductor, the output inductor current is non-pulsating. After some mathematical deductions, an experimental set-up with 12V input voltage, 48V output voltage, and 60W output power is used to verify the effectiveness of the proposed converter.

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