http://ieeexplore.ieee.org/iel5/5610941/5624686/05624745.pdf

Power electronics

In this work, the phase shifted carrier pulse width modulation (PSC PWM) technique is applied as the most favorable modulation scheme for a photovoltaic (PV) fed cascaded multilevel-micro-grid connected inverter (CM-MGCI), with consideration of the total harmonic distortion (THD) of the output voltage In addition to this, a modified PSC PWM method named as variable amplitude PSC-PWM (VA-PSC-PWM) is proposed To verify the performance of proposed PSC PWM method, MATLAB/Simulink simulations are performed with nine-level CM-MGCI To feed the CM-MGCI required voltage, a PV array is designed and a maximum power point tracking (MPPT) technique is demonstrated in MATLAB/Simulink environment From the voltage profile of VA-PSC-PWM technique, it is observed that the proposed method gives better THD profile than classical PSC PWM method Our proposed modified PSC-PWM also provides better THD profile compared to other recently proposed PSC-PWM technique

Amended THD with modified phase-shifted PWM for micro-grid connected multilevel inverter

/pdf/energetiskai-efektyvaus-fotovoltinio-mikroinverterio-kurimas-4bu9z09se9.pdf

Energetiškai efektyvaus fotovoltinio mikroinverterio kūrimas

Various level shifting-sinusoidal pulse width modulation (LS-SPWM) control schemes for the five-level cascaded H-bridge multilevel inverter (CHB-MLI) are presented in this paper. A five-level multilevel inverter working principle is explained with switching table. Phase disposition (PD), phase opposition disposition (POD), and alternate phase opposition disposition (APOD) modulation schemes are compared among them. Output voltage total harmonic distortion has been taken as a quality measuring constraint and the THD is measured in two ways, those are Nyquist form and maximum to maximum frequency form. As two constraints can be varied in the SPWM control schemes, they are modulation index and carrier frequency. First the carrier frequency has been kept constant at 3150 Hz and modulation index has been varied from under modulation to over modulation and noticed that at what modulation index the obtained THD is minimum for each control scheme. In a second step at critical modulation the carrier wave frequency has been varied and found that at which frequency the obtained THD is minimum for each control scheme. All the results are executed on Simulink platform and are tabulated and compared. With SPWM-APOD the minimum THD is obtained as compared among all the modulation schemes. Among the all carrier-based pulse width modulation (PWM) schemes level shifted PWM schemes are the best suitable for the CHB-MLI. These control schemes produce output pulses which is symmetrical to sinusoidal. Phase disposition (PD), phase opposition disposition (POD), and alternate phase opposition disposition (APOD) modulation schemes are well-known control schemes in the level-shifted PWM schemes. In this paper, a single-phase five-level CHB-MLI is simulated in MATLAB/Simulink software and a detailed comparison of these three modulation schemes simulated at various modulation indexes with fixed carrier frequency and simulated with different carrier frequencies with fixed modulation index at 1 (m = 1) with reference to total harmonic distortion (THD) in the output voltage. It is observed that all the modulation schemes produce the sinusoidal output voltage with minimum THD with under modulation index only (m < 1) and the APOD scheme produces minimum THD as compared with other two schemes. All the modulation schemes produce minimum THD at higher carrier frequencies.

SPWM Control Scheme for CHB-MLI with Minimal Voltage THD

Advancement in Multilevel Inverter Technologies and its Control Techniques has been emerging in leaps and bounds. Such an inclination towards this area is because of its high power handling capability as well as improved power quality. Low Total Harmonic Distortion (THD) and less thermal Stress on Switches and improved performance are its added advantages. Switching strategies plays a very important role in optimizing inverter performance parameters. In this paper a novel multicarrier sine Pulse Width Modulation (PWM) Phase Disposition technique is introduced which significantly reduces THD. The proposed switching technique is described using relevant mathematical analysis, and results are obtained from simulation study, which consequently illustrates the improved performance of the overall system as compared to conventional one.

Modified sine wave phase disposition PWM technique for harmonic reduction in multilevel inverter fed drives

The Class of firing schemes for Thyristors consist various analog and digital circuits used to create gate pulses which are given to the gate of thyristor in order to trigger it. The various circuits like UJT relaxation oscillator triggering, RC triggering, Ramp and Pedestrial Triggering, etc undergoes the problem of limited firing angle. One cannot reduce the firing angle below α = 26° using such circuits, as the value of capacitor and resistor limits the firing angle. For the very precise control of firing angle, Cosine Firing Scheme (CFS) can be implemented. Added advantage of CFS is that it can be controlled digitally using microcontrollers also, thus can be used in closed loop applications. In this paper, authors have reported design methodology and simulated results of the CFS used for thyristor triggering.

Design and Simulation of Cosine Firing Scheme for Thyristor Triggering

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Modified sine wave phase disposition PWM technique for harmonic reduction in multilevel inverter fed drives

Design and Simulation of Cosine Firing Scheme for Thyristor Triggering