Modelling and Simulation of a Sensorless Control of a True Asymmetric Cascade H-Bridge Multilevel Inverter PMSM Drives

2016 ◽  
Vol 7 (2) ◽  
pp. 397
Author(s):  
Kamel Saleh ◽  
Mark Sumner
Keyword(s):  
Harmonic Distortion ◽  
Modelling And Simulation ◽  
Multilevel Inverter ◽  
Current Response ◽  
Multilevel Converter ◽  
Ac Motor ◽  
Speed Range ◽  
Simulation Results ◽  
Level Converter ◽  
Wide Speed Range

This paper introduces a new method to track the saliency of an AC motor fed by a multilevel converter through measuring the dynamic current response of the motor line currents due the IGBT switching actions. The method uses only the fundamental PWM waveform (i.e there is no modification to the operation of the multilevel converter) similar to the fundamental PWM method proposed for a 2-level converter. Simulation results are provided to demonstrate the performance of the complete sensorless speed control of a PM motor driven by such a converter over a wide speed range. Finally the paper introduces a comparison between the 2-level converter and the multilevel converter in terms of the reduction of the Total Harmonic Distortion (THD) using the fundamental PWM method in both cases.

scholarly journals Performance Comparison of 2L-VSC, 3L-NPC, and 3L-MMC Converter Topologies for Interfacing Grid-Connected Systems

2021 ◽  
Author(s):  
Victor R. F. B. de Souza ◽  
Luciano S. Barros ◽  
Flavio B. Costa
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Performance Comparison ◽  
Test Results ◽  
Multilevel Converter ◽  
Simulation Test ◽  
Comparative Performance ◽  
Higher Power ◽  
Converter Topologies ◽  
Level Converter

Nowadays, power converters play a fundamental role in the conditioning and processing of active and reactive power, and are directly related to power quality indexes. In this sense, new multi-level converter topologies have been integrated in order to provide higher power processing capacity with lower harmonic distortion, switch stress, heating, and losses. The use of these structures compared to conventional two-level converters is especially suitable for high power of the order of megawatt. Considering the relevance of this approach, this paper presents a comparative performance analysis among the conventional two-level topology (2L-VSC) and two multilevel topologies in a grid-connected system: neutral point clamped (NPC) and modular multilevel converter (MMC). Simulation test results present the impacts on voltages and currents for the switches and the whole system, as well as the evaluation of the total harmonic distortion (THD) in order to highlight the crucial points of each topology for this kind of application.

Comparison of Switching Angle Arrangement Techniques in Single-Phase Boost Multilevel Inverter for Low-THD Operation

2015 ◽  
Vol 793 ◽  
pp. 167-171
Author(s):  
Mohd Aizuddin Yusof ◽  
Yee Chyan Tan ◽  
M. Othman ◽  
S.S. Lee ◽  
M.A. Roslan ◽  
...  
Keyword(s):  
Output Voltage ◽  
Single Phase ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Solar Photovoltaic ◽  
Voltage Waveform ◽  
Voltage Level ◽  
Software Simulation ◽  
Multilevel Inverters ◽  
Simulation Results

Multilevel inverters are one of the preferred inverter choices for solar photovoltaic (PV) applications. While these inverters are capable of producing AC staircase output voltage waveform, the total harmonic distortion (THD) of the output voltage waveform can become worse if the switching angle of each voltage level is not carefully chosen. In this paper, four switching angle arrangement techniques are presented and the switching angles generated by these techniques are applied to a new single-phase boost multilevel (SPBM) inverter. The performance of 3-, 5-, 7-, 9-and 11-level SPBM inverter having four different sets of switching angles derived using the aforementioned techniques have been evaluated and compared using PSIM software. Simulation results show that one of the techniques is able to produce an output voltage waveform with the lowest THD, whilst the other generates an output voltage waveform with the highest fundamental voltage component.

ANALYSIS OF A GENERALIZED SYMMETRICAL MULTILEVEL INVERTER

2011 ◽  
Vol 20 (02) ◽  
pp. 299-311 ◽  
Author(s):  
M. R. BANAEI ◽  
E. SALARY
Keyword(s):  
Control System ◽  
Drive System ◽  
Multilevel Inverter ◽  
Multilevel Converter ◽  
Dc Voltage ◽  
Ac Drive ◽  
Voltage Generation ◽  
Simulation Results ◽  
And Performance ◽  
Main Components

The cascade multilevel converter requires the least number of main components among traditional multilevel converter. In this paper, comparison of main components between proposed and traditional converter is shown. In addition, a generalized symmetrical multilevel inverter is proposed. The proposed multilevel inverter can generate DC voltage levels similar to other topologies with less number of components. The proposed topology results in reduction of installation area and cost and has simplicity of control system. This converter has been used in an AC drive system. The operation and performance of the proposed generalized multilevel converter has been verified by the simulation results using SIMULINK/MATLAB. The simulation results show its capability in voltage generation and speed control.

An Improved Symmetric H-Bridge Multilevel Converter Topology; An Attempt to Reduce Power Losses

2018 ◽  
Vol 27 (12) ◽  
pp. 1850187 ◽  
Author(s):  
Rasoul Shalchi Alishah ◽  
Seyed Hossein Hosseini ◽  
Ebrahim Babaei ◽  
Mehran Sabahi ◽  
Jaber Fallah Ardashir
Keyword(s):  
Harmonic Distortion ◽  
Power Losses ◽  
Multilevel Converter ◽  
Switching Losses ◽  
Current Path ◽  
Comparison Results ◽  
Converter Topology ◽  
Gate Driver ◽  
Level Converter ◽  
Symmetric Structures

In this paper, a new structure for multilevel converter based on improved H-bridge converter is presented. The proposed topology is a symmetric topology since the values of all voltage sources are equal. The proposed symmetric structure is a general topology which can be extended for any number of voltage levels at output voltage waveform to obtain the least value of total harmonic distortion (THD). Reduction of switching losses, conduction losses, the number of on-state switches in the current path, utilized DC voltage sources, and gate driver circuits are the main advantages of proposed symmetric structures in comparison with other symmetric topologies. All mathematical analysis on the proposed structure is presented in terms of power losses and maximum blocked voltage by switches. The comparison results with other recently presented symmetric topologies and traditional multilevel converter structures are provided. Experimental results for a thirteen-level converter based on presented structure are provided to validate the practicality of the suggested multilevel structure.

Simulation of Hybrid Excited Doubly Salient Motor Driven Control System

2011 ◽  
Vol 317-319 ◽  
pp. 354-360
Author(s):  
Long Fang Yi ◽  
Zhi Li ◽  
Jing Feng Mao ◽  
Ju Pin Gu ◽  
Yu Jian Qiang
Keyword(s):  
Control Strategies ◽  
Simulation Method ◽  
Operating Modes ◽  
System A ◽  
Driven System ◽  
Doubly Salient ◽  
Speed Range ◽  
Simulation Results ◽  
Power Operation ◽  
Wide Speed Range

To research the performance of hybrid excited doubly salient motor (HEDS) driven system, a HEDS mathematical model is derived and the simulation driven system is built by Simulink/PSB environment. According to the principal of HEDS driven and its control strategies, several simulations under different operating modes are modeled. The results show that, HEDS driven system is of higher torque at low speed, and is of wide speed range in constant power operation. The simulation results are consistent with theoretical analysis; it shows that the simulation method is validity and effectiveness.

Modelling and Simulation of 3-phase Transformerless Split Inductor Multilevel Inverter for Grid Connected Photovoltaic System

2013 ◽  
Vol 768 ◽  
pp. 75-79
Author(s):  
C. Bharatiraja ◽  
R. Palanisamy ◽  
Sushuruth Sadagopan ◽  
R. Latha ◽  
S.S. Dash
Keyword(s):  
Current Control ◽  
Modelling And Simulation ◽  
Multilevel Inverter ◽  
Photovoltaic System ◽  
Control Performance ◽  
Hysteresis Current Control ◽  
Common Mode Voltage ◽  
Operation Stability ◽  
Current Value ◽  
Simulation Results

A Split inductor is used with Exiting Inverter to interconnect inverter with grid connected system which avoids the usage of transformer. While using split inductor NPC-MLI shoot-through problems are producing in the bridge legs of an NPCTLI, its operation stability is ruined. Hysteresis Current Control (HCC) offers an excellent current control performance to NPCTLI. It acts based on the error current value i) and hysteresis band value (h). The proposed topology guarantees for no common-mode voltage, shoot-through possibility and capacitor balancing problem. Finally, the simulation results of a proposed SI-NPCTLI system verified using MATLAB SIMULINK.

scholarly journals Control of Cascaded H-Bridge Multilevel Inverter Based on Optimum Regulation of Switching Angles, and the FPGA Implementation

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Hatef Firouzkouhi
Keyword(s):  
Output Voltage ◽  
Harmonic Distortion ◽  
Fpga Implementation ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Switching Pattern ◽  
Multi Level ◽  
Simulation Results ◽  
Polynomial Term

A new concept in control of cascaded H-Bridge multi-level inverters is proposed in this paper. According to this concept, switching angles are considered to be independent from the fundamental voltage. A polynomial term is presented to show the relation between switching angles and DC voltages. Based on this concept, Total Harmonic Distortion (THD) calculations are updated and proved to be independent from the fundamental voltage. Thus, once calculated for minimum THD, the switching pattern can be used for any required level of output voltage. To examine the effectiveness of the proposed method, it is applied in control of an eleven level inverter. The simulation results are demonstrated and verified through experiments with a setup controlled by Xilinx SPARTAN3 family FPGA (XC3S400-PQG208).

scholarly journals WTHD minimisation in hybrid multilevel inverter using biogeographical based optimisation

2014 ◽  
Vol 63 (2) ◽  
pp. 187-196
Author(s):  
R. Kavitha ◽  
Rani Thottungal
Keyword(s):  
Lower Order ◽  
Harmonic Distortion ◽  
Transcendental Equation ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Simulation Results ◽  
Cascaded Multilevel Inverter ◽  
Inverter Topology

Abstract Harmonic minimisation in hybrid cascaded multilevel inverter involves complex nonlinear transcendental equation with multiple solutions. Hybrid cascaded multilevel can be implemented using reduced switch count when compared to traditional cascaded multilevel inverter topology. In this paper Biogeographical Based Optimisation (BBO) technique is applied to Hybrid multilevel inverter to determine the optimum switching angles with weighted total harmonic distortion (WTHD) as the objective function. Optimisation based on WTHD combines the advantage of both OMTHD (Optimal Minimisation of Total Harmonic Distortion) and SHE (Selective Harmonic Elimination) PWM. WTHD optimisation has the benefit of eliminating the specific lower order harmonics as in SHEPWM and minimisation of THD as in OMTHD. The simulation and experimental results for a 7 level multilevel inverter were presented. The results indicate that WTHD optimization provides both elimination of lower order harmonics and minimisation of Total Harmonic Distortion when compared to conventional OMTHD and SHE PWM. Experimental prototype of a seven level hybrid cascaded multilevel inverter is implemented to verify the simulation results.

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