T-source Inverter Research Articles

Multi-Input Ćuk Inverter Based on Model Predictive Control

In this paper multi-input Cuk- derived buck-boost inverter is presented based on Model Predictive Control (MPC). The control technique is applied to multi- input Cuk- derived buck-boost inverter because of the several features such as reduction of passive elements compared with two-stage topologies and the family of impedance inverters such as Z-source Inverter (ZSI), Quazi Source Inverter(QSI), T-Source Inverter (TSI), and Y-Source Inverter (YSI) .in addition , it is suitable for photovoltaic applications as it has the ability to boost the DC voltage from the PV cells and also invert it to AC voltage in the one stage. The model predictive control is applied in this paper to get a high response in the dynamic changes. In addition, more than one variable can be controlled in the same cost function, all the aforementioned features of the MPC can be achieved by using a technical called reducing horizon technique has been used. As the actual values are measured and compared with the reference for several solutions, the less accurate error will be given to use as action for the switched control. The power topology circuit and control algorithm have been validated by MATLAB/SIMULINK Software.

High-Efficiency T-Source Inverter With Low Voltage Spikes Across the Switch Bridge

Coupled-inductor-based impedance-source inverters have been suggested as a solution for improving the voltage boost capability. However, large voltage spikes can sometimes appear across the switch bridge if the leakage inductance of the coupled inductor cannot be nullified. Higher voltage-rated switches are, therefore, necessary for implementing each inverter with generally lower efficiency anticipated. To solve the above issues, this article proposes a high-efficiency T-source inverter (HE-TSI) with leakage energy recycled through several passive elements and, hence, avoided voltage spikes across the switch bridge. To reveal the prominent characteristics of the HE-TSI, it has been compared with the traditional T-source inverter in the terms of extents of voltage spikes across the switch bridge, voltage stresses, current stresses, and efficiency. The simulation and experimental results have verified the validity of the proposed HE-TSI.

Analytical comparison and implementation of different inverter topologies for three-phase on-line uninterruptible power supply

Uninterruptible Power Supply (UPS) is a power electronics based system that provides continuous electric power supply to critical equipments when input power fails. For the better performance of UPS when compared with traditional UPS, this paper presents the Z-Source Inverter (ZSI), T-Source Inverter (TSI) and Switched Inductor Z-Source Inverter (SLZSI). The three Pulse Width Modulation (PWM) control techniques like Simple Boost (SB), Maximum Boost (MB) and Third Harmonic Injected Maximum Constant Boost (THIMCB) PWM control are incorporated and compared for the performance analysis of UPS systems by MATLAB/SIMULINK. From the simulation results, it is found that the UPS with SLZSI under THIMCB PWM control is found superior when compared with the UPS with ZSI and TSI. An experimental setup has been developed for the proposed UPS with SLZSI by implementing the THIMCB PWM control algorithm and measurements were taken to validate the theoretical and simulation results.

PR controller design and stability analysis of single stage T-source inverter based solar PV system

Solar Photovoltaic (SPV)-based power generation systems are popular among various renewable energy sources due to their flexibility in capacity addition and low maintenance cost .The output power from an SPV plant is intermittent due to inconsistent atmospheric temperature and irradiance, which influences the reliability, stability and power quality of the utility grid. To be specific the intermittency of solar plant output imposes harmonics and resonance issues in the grid. These issues can be solved by using appropriate controllers in the inverter system. In this work, a DC link voltage control-based PI controller and a rotating reference frame technique-based PR controller are used on the input side and on the grid side of the inverter, respectively .The PR controller minimizes the voltage distortion caused due to the resonance in the LCL filter employed on the grid side of the inverter . It also aids in reducing the steady-state error of the system, thus minimizing the lower order harmonics. The proposed controllers i.e. PI and PR controllers, are simulated and analyzed using MATLAB Simulink and the simulation results are validated using a 1 kW solar PV prototype model.

THREE PHASE ON-LINE UPS BY IMPLEMENTING T-SOURCE INVERTER WITH MAXIMUM CONSTANT BOOST PWM CONTROL

This paper presents the new topology of three phase on line Uninterruptible Power Supply (UPS) by employing T-Source Inverter (TSI) with maximum constant boost Pulse Width Modulation (PWM) control and the results are compared with the conventional Uninterruptible Power Supply (UPS). The conventional UPS consists of Voltage Source Inverter (VSI) with step up transformer or DC-DC booster which decreases the efficiency and increases energy conversion cost. The proposed three phase UPS with TSI has the voltage boost capability through shoot through zero state which is not present in the conventional VSI. This proposed UPS increases the efficiency due to single stage conversion, reduces the harmonics, increases the voltage gain and reduces the voltage stress. The performance of the three phase on-line UPS with TSI is simulated in MATLAB / SIMULINK software and the results are compared with conventional UPS. The simulation and the theoretical analysis are validated with experimental results.

Comparison of Different PWM Techniques in T-Source Inverter

This paper deals with the analysis of three phase Tsource inverter by using different control techniques to minimize the switching losses. T-source impedance network is developed to overcome the drawbacks of Z-source inverter. TSource inverter has low reactive components in comparing with ZSI. The Total harmonic distortion (THD) of output voltage for both the control methods has been analyzed by using FFT analysis. The maximum constant boost pulse width modulation (PWM) control method has more voltage gain and less voltage stress compared to other techniques. The experiments are done and the results are shown for capacitor voltage, load current and load line voltage for simple boost, constant boost control technique and space vector modulation PWM techniques are presented using MATLAB/Simulink.

High-efficient three-phase on-line UPS by using T-source inverter with third harmonic injected maximum constant boost PWM control

This paper presents the analysis of three-phase on-line uninterruptible power supply (UPS) by employing T-source inverter (TSI) with third harmonic injected maximum constant boost PWM control and the results are compared with traditional UPS. Traditional UPS consists of step-up transformer or DC–DC booster along with voltage source inverter which decreases the efficiency and increases energy conversion cost. The proposed three-phase UPS using TSI has high-voltage boost capability through shoot-through zero state which is not present in traditional voltage source inverter (VSI) and current source inverter. This proposed UPS with TSI increases the efficiency with fewer components, reduces the harmonics, increases the voltage gain, and reduces the voltage stress. The performance of three-phase on-line UPS based on TSI is analyzed and evaluated in MATLAB/SIMULINK software and the results are compared with Z-source inverter-fed UPS and VSI-fed UPS. Experimental results are presented for the validation of the simulation and theoretical analysis.

Analysis of T-Source Inverter with PWM Technique for High Voltage Gain Application

This paper deals with Analysis of T-Source inverter with PWM Technique for high voltage gain application. The T-source impedance network is newly introduced to overcome the problems of Z-source inverter. This T-source inverter is similar to Z-source inverter except the use of high frequency low leakage inductance transformer. It has low reactive components in compare with conventional ZSI. This T-source inverter has an ability to perform dc to ac power conversion and it provides buck -boost operation in a single stage. The traditional inverters cannot provide such feature. Operating principle of T-source inverter is almost same as that of ZSI. All traditional PWM methods can be used to control T-source inverter. The utilization of shoot-through switching state is enhanced in T-source inverter which helps in the unique usage of buck-boost feature to the inverter. It is recommended that to maintain the constant voltage in the input side to get the appropriate output voltage.

Analysis of T-Source Inverter with PWM Technique for High Voltage Gain Application

Analysis of T-Source Inverter with PWM Technique for High Voltage Gain Application

Dynamic modeling and analysis of T-source electronic inverter using state space technique

T-Source inverter is a single stage power converter which can be used as a cost effective alternative for Z-source inverter. Dynamic modeling and analysis of T-source inverter (TSI) is vital for the determination of system limits, components selection for T-shape impedance network and controller design. A novel dynamic model of TSI in continuous conduction mode using the state space approach has been derived here. The derived model has been analyzed by introducing a disturbance in both the load and source side of the TSI. The stability, limitations and component selection of TSI have been done using pole-zero map and frequency response plots. The mathematical models are verified by Matlab / Simulink and experimental results. Key words: T-Source Inverter, dynamic model, small signal model, state space model, continuous conduction mode.