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This paper presents two selective harmonic elimination (SHE) and a mixed SHE-selective harmonic mitigation (SHM) procedures applied to 5-level inverter. The first one is a graphical procedure to control harmonic spectrum of a given voltage and/or current waveform. A fundamental frequency technique using a reference sinusoidal signal (RSS) to modulate the output voltage waveform v0 is applied, considering...
This paper presents a procedure that works at fundamental frequency to compute switching angles in single phase 9-level converters to eliminate the third and odd triple harmonics and to reduce other low order harmonics, obtaining a low total harmonic distortion (THD). The DC voltages feeding the converter, that are equal, but variable, allow to obtain switching angles independent on modulation index...
Multilevel converter topologies have been receiving increased attention for medium and high power application in past years. This paper focuses on a new topology of 7-level multilevel inverter (MLI) named as improved H-bridge MLI (IHB MLI) with less number of switches than conventional type with 12 switches, which results in reduction of switching losses, switching stress and converter cost. This...
A new direct power control (DPC) approach for a voltage source inverter (VSI) based three-phase grid-connected solar photovoltaic (PV) system is proposed in this paper. The proposed DPC is designed using the nonlinear backstepping control scheme based on the power dynamics rather than the conventional dp current dynamics. As a result, the inner current control loop is eradicated in this paper which...
This paper solves harmonic elimination problem, and minimizes total harmonic distortion by a recently developed heuristics: moth-flame optimization method. 5th and 7th order harmonics are eliminated for a seven level cascaded multilevel inverter, and 5th, 7th, 11th and 13th order harmonics are eliminated for an eleven level cascaded multilevel inverter. Simulation results of a seven level cascaded...
Single unit DC-AC power converters are gaining more popularity due to their features in terms of size, cost, weight and simplicity of the system. In various DC-AC power converters if a voltage source inverter (VSI) is used then an additional DC-DC boosting stage is required. This paper proposes a new single unit DC-AC power converter, called split source inverter. SSI is a combination of boost stage...
A basic unit configuration which uses very less number of switches for obtaining an asymmetric multilevel inverter is proposed in this paper. Even and odd voltage levels at the output can be achieved by adding a conventional inverter bridge circuit to basic unit. Asymmetric configurations have different value of dc sources, so large number of levels will obtained at the output with reduced number...
Multilevel inverters are of special importance in high power and medium power applications. Reduced distortion, better output power quality, minimum switching losses, reduced switching stress make multilevel architecture preferred. This paper demonstrates a new topology of a 9-level and 15-level inverters which requires less number of power switches and as well as DC voltage sources than that of existing...
This paper investigates about the impact of the number of levels and of the corresponding modulations angles on the mitigation of harmonics in cascaded H-bridge multilevel inverters. A mathematical model to reduce Nth odd harmonics from the output voltage of a multilevel converter is represented as a constrained optimization problem. It is further transformed in an unconstrained optimization problem...
The harmonic contents of the output waveform of the power converters is a very important factor in electrical power quality. In this paper a five-level cascaded inverter with unequal DC sources is considered and a selective harmonic elimination technique at fundamental frequency, based on the graphical separation of functions zeros, is considered to reduce total harmonic distortion in the inverter...
Selective harmonic elimination (SHE) is a widely used method to minimize the amount of total harmonic distortion (THD) in multilevel inverters. The main challenge associated with SHE method is to solve multiple variable high order nonlinear equations to obtain desired switching angles. To overcome this problem, a new online approach is provided in this paper which does not require solving complex...
This paper presents three-phase current source inverter with hysteresis control in voltage source mode. Analysis of the output characteristics of the converter was made. The voltage source mode for current source inverter was considered. A computer model of three-phase current source inverter and control system with hysteresis control was developed. The basic diagrams illustrating working capacity...
Building Integrated Photovoltaic cell has become the emerging Trend in the area of power electronics and energy conversion. This paper pay attention on the interfacing of MPPT based Photovoltaic cell with Cascade Multilevel Inverter. Integrated Solar panel has efficiency losses due to rapid variation in light intensity and temperature of the panel. This control issue on PV side is handled by an efficient...
Building Integrated solar cell has now becoming the rising Trend in the area of industrial drives and energy conversion. This paper focuses on the interfacing of MPPT based Photovoltaic cell with Cascade Multilevel Inverter. Integrated PV panel has performance losses due to quick variation in solar light intensity and temperature of the solar panel. This constraint on PV side is managed by an effective...
The purpose of this paper is to analyze the harmonic current distortion in a system with air conditioners driven by frequency converters and its correction waveform current with the use of two filters tuned in different frequencies. The use of air conditioners inverter, despite lower power consumption, the circuit injects harmonic frequencies of multiple orders that pollute the system. The filters...
This paper concentrates on the application of a three-level Neutral-Point Clamped (NPC) inverter in a Permanent Magnet Synchronous Motor (PMSM) driven electric vehicle. Carrier-Based Space Vector Modulation (CB-SVM) strategy allows a simple technique for inverter switching. A split-capacitor dc bus voltage balancing strategy using a simple PI controller has been presented for the entire speed range...
In this paper, I propose the Minimum Total Harmonic Distortion Pulse Amplitude Modulation control method. This control method is beforehand calculating the switching pattern to minimize THD by adding a redundant pulse. This is attributed to increase of the motor iron loss depending on harmonic voltage.
In recent years, increasing concerns about climate change and the liberalisation of energy market have provided the necessary impetus for a revolutionary restructuring of the electricity network at every level, namely production, transmission and distribution. Increased electricity production from renewable energy sources (RES) coupled with energy efficiency lie at the heart of the ambitious targets...
In this paper, a photovoltaic array has been modeled and developed for MATLAB-Simulink environment. The PVA model has been developed by basic circuitry equations of a photovoltaic array, considering the effects of ambient temperature, solar radiation and natural specifications of the photovoltaic cell. For evaluating the model, two different types of the loads have been utilized, a direct coupled...
Multilevel Inverters are becoming popular for their high voltage operating capability for high power applications. This paper presents a comparative study of Cascaded H-Bridge, Neutral Point Clamped and Flying Capacitor multilevel voltage source inverters. These five-level inverters are simulated in MATLAB/ Simulink using multi carrier sine pulse width modulation. FFT analyses of output voltages for...
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