Fractional Order PID Controlled PV Buck Boost Converter with Coupled Inductor

Buck-boost converter is a good interface between PV and the load. This paper deals with comparison between PI and FOPID controlled PV fed Buck Boost Converter with Coupled Inductor (PVBBCCI) systems. Open loop PVBBCCI system, closed loop PI controlled PVBBCCI and FOPID based PVBBCCI systems are designed, modeled and simulated using Simulink and their results are presented. The investigations indicate the superior performance of FOPID controlled PVBBCCI system. The proposed system has advantages like reduced hardware count enhanced dynamic response and improved stability.</jats:p

An optimal voltage stability enhancement in the power systems by locating optimal place with more contingency risk

The electrical components of a power system network take advantage to supply, transmission and service electrical power. Abnormal flow of voltage through the transmission lines might lead to big causes. Thyristor controlled series compensator (TCSC) devices are most frequently used device in the power to maintain the voltage stability. However, this device is costlier and cannot be fixed on every transmission line which would lead to more processing cost. Thus, the maintaining voltage stability of transmission lines with reduced production cost attracts a various researcher to find the novel approaches. In the existing system, to improve the stability of power system and minimize the losses by include the reactive power through TCSC device at applicable location by the algorithm of particle swarm optimization is available with the help of line stability index value. The PSO is constrained to poor exploitation problem which might generate inaccurate results. In the proposed research work, Biogeography Based Krill Herd (BBKH) method is used for optimal identification of TCSC's, STATCOM and UPFC size and location. Voltage collapse proximity indicator (VCPI) value is used in this work for the finding of the voltage instability measurement by finding the critical lines among the entire transmission lines. The proposed research effort is implemented in IEEE 39 test bus system using MATLAB software and verified, it furnishes improved outcome than other investigation methodologies

A DC Inrush Current Minimisation Method using Modified Z-source Inverter in Adjustable Speed Drives

The adjustable speed drives employ PWM converter – inverter system in order to obtain unity power factor.The DC inrush current in DC link capacitors of the rectifier limits the operation of power devices.Hence, this paper proposes a new approach to reduce the DC inrush current by employing modified Z-source inverter in a Adjustable Speed Drive system. The operating principles, design procedure and simulation results are shown and compared with the conventional Z-Source inverter

Transient Analysis of the Fuzzy Logic-based Speed Control of a Three-phase BLDC Motor

The energy-efficient motor is a vital requirement for modern industrial, automobile, and home appliance drives. Among the special machines, the Brushless DC Motors (BLDCMs) are more attractive to the application engineer because they offer high power-to-weight ratio, compact construction, do not require consistent maintenance, and have an efficiency margin of 85–90%. This study uses FPGA to create fuzzy logic-based speed control for a three-phase BLDCM with transient time domain characteristics. The fuzzy logic-based controller algorithm is implemented using the FPGA Xilinx Spartan board, which receives the actual speed from a position sensor located inside the BLDCM. It calculates the ratio of the duty cycle of the Pulse Width Modulation (PWM) pulse. It is triggered by the driver system of the BLDCM drive to attain the reference speed. The performance characteristics of a BLDC motor drive such as steady-state error, peak overshoot, speed drop under loaded conditions, and restoration time after loaded conditions were analyzed using MATLAB/Simulink 2014. The hardware configuration setup is validated by the suggested system's simulation response.</jats:p

Comparison of Sine and Space Vector Modulated Embedded Z-source Inverter fed Three Phase Induction Motor Drive System

This paper deals with performance of photovoltaic powered Embedded Z-Source Inverter (EZSI) fed Induction motor drive. The DC output from the PV-Panel is boosted and converted into AC using Embedded Z-Source Inverter. EZSI system based on the concept of Z-Source Inverter (ZSI), which provides single stage power conversion. The EZSI also produce same voltage gain as that of the ZSI based system. In EZSI the DC source is embedded within the X-shaped LC impedance network, due to this EZSI has the added advantage of inherent source filtering capability , this can be achieved without any extra passive filter. EZSI can produce the AC output voltage which is greater than the DC link voltage. EZSI system also provides ride-through capability under voltage sags. In this paper the performance of space vector modulated EZSI fed Induction Motor Drive is compared with sinusoidal PWM controlled EZSI fed Drive system. The PV powered EZSI fed three phase Induction Motor System is designed, modeled and simulated using MAT LAB-SIMULINK and the corresponding results are presented. This drive system has advantages like voltage boosting ability and reduced harmonic content