scholarly journals Improved Capacitor Voltage Balancing Algorithm for a Single-phase T-type Inverter

2021 ◽  
Vol 31.2 (149) ◽  
pp. 15-21
Keyword(s):  
Charge State ◽  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Experimental Results ◽  
Modulation Index ◽  
Modulation Method ◽  
Voltage Balancing ◽  
Capacitor Voltage ◽  
Independent Mode

The paper proposes an improved pulse width modulation algorithm to solve the voltage imbalance on DC capacitors for single-phase T-type inverter. By changing the modulation index, the residual states can be applied to the discharge/charge state on the DC capacitors to balance the voltage. The proposed algorithm is validated for application in single-phase T-type inverters in independent mode. The simulation and experimental results have confirmed the effectiveness of the improved pulse width modulation method for single-phase T-type inverter. The paper proposes an improved pulse width modulation algorithm to solve the voltage imbalance on DC capacitors for single-phase T-type inverter. By changing the modulation index, the residual states can be applied to the discharge/charge state on the DC capacitors to balance the voltage. The proposed algorithm is validated for application in single-phase T-type inverters in independent mode. The simulation and experimental results have confirmed the effectiveness of the improved pulse width modulation method for single-phase T-type inverter.

scholarly journals A Hybrid Self-Voltage Balanced Multilevel Inverter Topologies for Induction Motors

2021 ◽  
Vol 7 (4) ◽  
pp. 1-8
Author(s):  
Sanjeev Kumar ◽  
◽  
H.K. Verma ◽  
M.P.S. Chawla ◽  
◽  
...  
Keyword(s):  
Single Phase ◽  
Pulse Width Modulation ◽  
Operating Mode ◽  
Multilevel Inverter ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Voltage Balancing ◽  
Three Phase ◽  
Capacitor Voltage ◽  
Sinusoidal Pulse Width Modulation

A hybrid structured asymmetric switching capacitor multilevel inverter (ASC-MLI) is suggested in this work. The notion behind presenting this topology is to reduce the device count and DC sources as compared with conventional MLI. The step by step operating mode of single phase ASC-MLI is presented and by doing slight modifications the same configuration is used in three phase utility application and electric drive. The proposed configurations utilize major benefits of self-voltage balancing capability of capacitor voltage, which is independent from different load type and modulations index. To generate the switching pulse for corresponding switches the multi-carrier based sinusoidal pulse width modulation (MCS-PWM) technique is used; in addition to this simulation result are obtained using MATLAB/Simulink 2016b software version. Simulation results of an induction motor drive connected as three phase load highlights good performance of 17-level MLI.

scholarly journals Generalized Carrier-Based PWM Method for a 12-Switch Converter

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Kennedy Adinbo Aganah ◽  
Olorunfemi Ojo
Keyword(s):  
Pulse Width ◽  
Pulse Width Modulation ◽  
Experimental Results ◽  
Modulation Method ◽  
Converter Topology ◽  
First Time ◽  
Theoretical Simulations ◽  
Special Case

Abstract This paper proposes a generalized carrier-based pulse-width modulation (CBPWM) method for a 12-switch converter feeding three independent loads. The converter topology is part of the (3N + 3)-switch converter family where N is the number of outputs (N = 3 for this special case). Its more famous sibling is the 9-switch converter which is gaining considerable interest from researchers because of its reduced-switch count architecture. The structure and limitations of the converter are elaborated; its modulation method applicable to both equal and different frequency (and/or amplitude) operations is formulated. The generalized neutral voltages for the converter is derived for the first time and used as the offset voltages required by this type of topology to decouple its three outputs. The proposed algorithm is validated by both theoretical simulations and experimental results.

scholarly journals Implementation Hardware of single phase H-Bridge Inverter with Selective Harmonic Elimination Pulse Width Modulation Technique

2019 ◽  
Vol 8 (11) ◽  
pp. 1089-1092
Keyword(s):  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Modulation Index ◽  
Voltage Source ◽  
Power Electronic ◽  
Efficient Operation ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Electronic Switches

Recently the use of high power Voltage Source Inverter is increased but the problem of harmonic and switching losses in inverter are also increased because of the use of power electronic switches, which are used for fast and efficient operation. In this paper, for eliminating the harmonics presented in H Bridge inverter during switching operation of the power electronic switches the Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) Technique is used. For H-Bridge operation specific switching angles are calculated by solving nonlinear equation using Newton Raphson method. The result of H-bridge single phase inverter are implemented on hardware with and without SHEPWM technique for eliminated specific 3 rd,5th,7th,9th,11th,13th voltage harmonics are obtained. Comparison of harmonic analysis of H bridge inverter with and without SHEPWM technique is done. In this paper Modulation index (m) is varied to control output voltage amplitude and the results are observed for maximum modulation index.

Pulse width modulation method of a single-phase multilevel inverter

1987 ◽  
Vol 63 (6) ◽  
pp. 951-960 ◽  
Author(s):  
KUNIOMI OGUCHI ◽  
TAKAFUMI KUSAKABE ◽  
FUJIO SUDO
Keyword(s):  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Multilevel Inverter ◽  
Modulation Method

scholarly journals Single Phase Asymmetrical Cascaded MLI with Extreme Output Voltage Levels to Switch Ratio

2018 ◽  
Vol 9 (2) ◽  
pp. 712
Author(s):  
Mahrous Ahmed ◽  
Essam Hendawi ◽  
Mohamed K. Metwaly
Keyword(s):  
Fundamental Frequency ◽  
Pulse Width ◽  
Output Voltage ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Modulation Index ◽  
Pwm Control ◽  
Inductive Load ◽  
Control Schemes ◽  
Simulation Results

This paper proposes an asymmetrical cascaded single phase H-bridge inverter. The proposed inverter consists of two modules with unequal and isolated dc sources. Each module is composed of dc source, conventional four switches H-bridge and single bidirectional switch. To increase the output voltage levels, the tertiary ratio, 1:3, between its two dc sources is adopted. Both the fundamental frequency and the multicarrier pulse width modulation (PWM) control schemes are employed to generate switches signals. By controlling the inverter modulation index, the proposed inverter can generate an output voltage having up to seventeen levels by using only two modules. The proposed topology has also the feature of modularity which means that it can be extended to any levels by adding new modules. The proposed topology is simulated using an inductive load and some selected simulation results have been provided to validate the proposed inverter.

Analysis and simulation of a single-phase seven-level inverter controlled by modified sinusoidal PWM technique

2021 ◽  
pp. 2150024
Author(s):  
V. srinath ◽  
Man Mohan Agarwal ◽  
D. K. Chaturvedi
Keyword(s):  
Pulse Width ◽  
Output Voltage ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Optimization Technique ◽  
Reference Signal ◽  
Harmonic Distortion ◽  
Modulation Index ◽  
Reference Signals ◽  
Sinusoidal Pulse Width Modulation

In this paper, a modified Sinusoidal Pulse width Modulation (MSPWM) technique and a modified single-phase H-bridge seven-level inverter is proposed. The switching pulses for the proposed seven-level inverter are generated using a single triangular carrier waveform, a fully rectified sinusoidal signal, and three stepped reference signals (Uref1, Uref2 and Uref3). Using optimization technique, the magnitude of the stepped reference signal is determined so that the total harmonic distortion (THD) of the output voltage waveform is minimum and the fundamental component, RMS value of the voltage is improved for a given modulation index Ma as compared to the Sinusoidal Pulse width Modulation (SPWM). By the implementation of the new scheme, the seven-level of the inverter output voltage level (+Vdc, +2Vdc/3, +Vdc/3, 0, −Vdc, −2Vdc/3, −Vdc) is obtained for any given modulation index. Similarly, if only two stepped reference signals are used then the inverter will act as a five-level inverter for any modulating index ma. The proposed MSPWM and seven-level inverter are simulated on MATLAB/SIMULINK for R, R-L load and on a single-phase capacitor-start and capacitor-start-run Induction Motor.

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