Query: four-switch  three-phase

title: Adaptive Super Twisting Sliding Mode Controller Based PMSM Fed Four Switch Three Phase Inverter
abstract: This paper addresses design and modeling of Adaptive Super Twisting Sliding Mode Controller and back EMF observer based sensorless control of PMSM fed four switch three phase inverter. Permanent magnet synchronous motor can affect by some component variation and external disturbances. It will help to improve the accuracy and effective operation of the motor. Single phase short circuit fault identification and reconfiguration system for Three Phase Four Switch (TPFS) Inverter fed sensorless PMSM drive with Adaptive Super Twisting Sliding Mode Controller (ASTSMC) is proposed. The use of reducing switches leads to reducing the switching losses. ASTSMC eliminates the chattering problem and increases the robustness motor. Sensorless technique fed Three Phase Four Switch Inverter with Adaptive Super Twisting Sliding Mode Controller is implemented using MATLAB/Simulink.

title: VECTOR CONTROL OF FOUR SWITCH THREE PHASE INVERTER FED INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE WITHOUT POSITION SENSOR
abstract: This paper proposes a vector control methodology for Four Switch Three Phase (FSTP) inverter fed Interior Permanent Magnet Synchronous Motor (IPMSM) drive with Real Time Recurrent Neural Network (RTRNN) based stator flux estimator. In the proposed control scheme, instead of a usual Six Switch Three Phase (SSTP) inverter a Four Switch Three Phase (FSTP) inverter is used. This reduces the cost of the inverter, the switching losses, and the complexity of the control board for generating six Pulse Width Modulated (PWM) signals. A simulation model of the drive system is developed and used in this paper. A Proportional plus Integral (PI) controller is used to process the speed error. Closed loop vector control technique with Clarke's transformation is used in this study. Two independent hysteresis current controllers with a suitable hysteresis band are utilized for inverter switching. The robustness of the drive system is tested for different operating conditions and found to work acceptably under these conditions.

title: Three Phase Four Switch Converter for SPMS Generators Based on Model Predictive Current Control for Wave Energy Applications
abstract: This paper presents a model predictive current control (MPCC) for three phase four switch converters (TPFSC) connected to surface permanent magnet synchronous generators (SPMSGs) in oscillating water column (OWC) wave energy plants, that brings some benefits over the existing control methods used in this type of plants. The proposed MPCC for TPFSC follows the current references with great accuracy, whereas the switching frequency of the insulated gate bipolar transistor (IGBTs) is fixed and low. This method minimizes the current reference tracking error, and its fast response makes it suitable for the power take off systems present in wave energy converters. Furthermore, the system features a fast capacitor voltage offset suppression control. The dynamic performance and the voltage offset control of the proposed strategy for TPFSC feeding a SPMSG is evaluated in the Simulink environment. Later, experimental studies are carried out on an 8.7 kW laboratory SPMSG prototype. Finally, the capability of the proposed method to harvest the maximum energy from irregular waves is assessed using an OWC power plant emulator.

title: Design and Implementation of Four Switch Current Sensorless Control for Three Phase PFC Converter
abstract: Four switch current sensorless control for three phase four switch converter with power factor correction (PFC) function is presented in this letter. In comparison with conventional multiloop control methods, the proposed control strategy requires sensing of two line voltages and two capacitor voltages only to achieve PFC function. As there is no sensing current, the proposed sensorless control scheme reduces the cost and complexity of design. The performance of the proposed control is validated by its implementation in digital signal processing (DSP) TMS320F28335, and the result shows that the proposed scheme is able to provide comparable PFC performance without sensing current.

title: Four Switch Three Phase Static VAR Compensator with Capacitor Voltage Offset Suppression
abstract: Fault tolerant capability as well as cost reduction of Four Switch Three Phase (FSTP) converter in comparison with its traditional Six Switch Three Phase (SSTP) counterpart, has attracted lots of attention in last decade. Despite its versatile features, it suffers from some intrinsic problems. Voltage offset of DC link capacitors along with superimposed second harmonic voltage ripple on capacitors voltage are major issues with FSTP. In this paper an Adaptive Space Vector Modulation (SVM) is proposed for a Static VAR compensator which guaranties the balanced current injection to the grid, even though, the DC voltage ripple is existing. Besides, as the DC link Capacitors are floating in Static VAR compensators, unequal voltage division on them is the next concern. These issues are also tackled by sensing the capacitors voltage and made modification on reference voltages which is fed to the modulator. Time domain simulation in Matlab/Simulink is undertaken to evaluate the efficacy of the proposed method.

title: FOUR SWITCH THREE PHASE SEPIC INVERTER WITH FRONT END BOOST CONVERTER
abstract: In this paper, four switch sepic inverter with front end boost converter capable of producing quality three phase ac output is explained. Proposed topology is an advanced one when comparing with conventional topologies .Converter offer a design for the inverter with the combination of single ended primary inductance which can obtain higher phase voltages compared to conventional four switch and six switch three phase inverters. A differential arrangement of SEPIC enables to obtained three phase balanced output voltage with only four switches. The output voltage is pure sinusoidal without the help of external filter. This proposed inverter is designed to reduce the cost, complexity and switching losses .It also improves the efficiency and reduces the harmonic distortion. Here the output of the inverters are connected deferentially across the load. The line voltage can not exceed the full value of the input dc voltage, for avoiding this a dc dc boost converter is placed in the front end of the four switch sepic inverter, thus producing the required output voltage along with the sinusoidal nature. Due to this features, the inverter can be used for the grid integration and pv based power extraction. Proposed topology is operated in both current control algorithm and a modified sine pwm control technique. In this paper it is based on the novel sine pwm control technique. The topology is analysed, simulated using MATLAB/SIMULINK and also a prototype is accomplished to verify the feasibility of the proposed topology.

title: Reduction of Electromagnetic Interference for Permanent Magnet Synchronous Motor Using Random PWM Switching Method Based on Four Switch Three Phase Inverters
abstract: The four switch three phase inverters have become an effective approach for fault tolerant reconstruction and operation of the six switch three phase topology. However, the conventional control strategy for four switch three phase inverters can result in a large number of current harmonic components, high electromagnetic acoustic noise, and electromagnetic interference (EMI) Therefore, this paper proposes a random switching frequency pulse width modulation method under the centrosymmetry period with a two state Markov chain based on four switch three phase inverters (RSFPWM CPTMC) In this method, random numbers are optimized and evenly distributed on both sides of the center frequency within a specific frequency bandwidth range, which significantly reduces the current harmonics and EMI at the switching frequency and frequency multiplication. The spectral characteristics generated by the random switching frequency under the centrosymmetry period with the two state Markov chain are evaluated and compared to that provided by the traditional fixed switching frequency pulse width modulation (FSFPWM) Simulations and experiments are carried out to illustrate the superiority of the proposal.

title: Improved Performance of Four Switch Three Phase Brushless DC Motor using Speed Current Control Algorithm
abstract: A new combined speed and current control algorithm is proposed for four switch three phase brushless dc (BLDC) motor drives. A single current sensor control strategy is proposed, in which only phase c current is being measured. Phase c current is maintained at nearly zero level first, and phase a and phase b currents are regulated by speed circle. To improve the controller performance, a single neuron adaptive proportional integral (PI) algorithm is adopted to realize the speed regulator. Simulation and results, the proposed strategy shows good self adapted track ability with low current ripple and strong robustness to the given speed reference model.

title: DSP Based Speed Sensorless Controlled Four Switch Three Phase Inverter Fed Induction Motor Drive Using MRAS
abstract: This paper investigates performance of a Model reference adaptive system (MRAS) based cost effective drive system of an induction motor (IM) for low cost applications. In this paper, the MRAS is used as a speed estimator and the motor is fed from a four switch three phase (FSTP) inverter instead of a conventional six switch three phase (SSTP) inverter. This configuration reduces the cost of the inverter, the switching losses, and the complexity of the control algorithms. The robustness of the proposed MRAS based FSTP inverter fed IM drive is verified by Experimental results at different operating conditions. A comparison of the proposed FSTP inverter fed IM drive with a conventional SSTP inverter system is also made in terms of the performance analysis. The proposed FSTP inverter fed IM drive is found quite acceptable considering its performance, cost reduction and other advantages.

title: A Four Switch Three Phase AC DC Converter With Galvanic Isolation
abstract: A new single stage three phase ac dc converter with four switches and galvanic isolation is proposed in this paper. The new converter is simple and uses fewer switches than previously proposed ac dc converters of the same type. It is a bridgeless converter that can operate with continuous input current and with any pulsewidth modulated method suitable for a standard three phase six switch voltage source rectifier. In this paper, the operation, control, analysis, and design of the proposed converter are explained and its features are discussed. Experimental results obtained from a prototype that confirm the feasibility of the converter are presented as well.