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Electric energy is usually generated through power stations (hydroelectric, gas, coil, nuclear) interconnected to ensure the power supply; but in the last years a massive number of renewable energy resources have been integrated in the electric grid helping to fulfill the power demand. Nevertheless, the interconnection of multiple generation along the distribution system affects the power quality...
Multilevel inverters (MLI) are employed to enhance the performance of the motor drives, in which the performance improvement is depends on the modulation scheme and the number of power switches and associated components of MLI. Various limitations of conventional sinusoidal pulse width modulation (SPWM) technique result in drives with lesser efficiency. Space Vector Pulse Width Modulation (SVPWM)...
This paper presents single phase matrix converter (SPMC) topology capable of generating a higher output frequency which is used for high frequency applications such as induction heating. Proposed configuration reduces total harmonic distortion (THD) of supply current with the injection of LC resonant filter at the supply end. By the analysis of dominant side band components of the supply current,...
This paper presents a comparative review of three different three phase inverter topologies namely the PWM Inverter, 180 Conduction Inverter, and the Multilevel Inverter. The comparison between these topologies is carried out on the basis of percentage of Total Harmonic Distortion (THD) that exists in the output voltage. In this work, each inverter operates at the 100V DC input. The complete analysis...
Ideally, distribution utilities are responsible to provide good power at a fixed rated frequency to the consumer end at unity power factor. Due to the bulk usage of non-linear power electronic loads, distribution system network (DSN) suffers large current distortion. Further, the intermittent hybrid natural green sources (HNGS) like PV and PMSG wind grid connected using hysteresis current controller...
This paper describes a development of a high power density power converter using flying capacitor multilevel circuits for PV systems. To connect the PV systems to a power grid, a power conditioner system (PCS) is required. Sine wave filters and EMI filters are required to satisfy harmonics regulations such as CISPR. These filters are dominant in a total volume of the PCSs. To design a small PCS to...
The Capacitor-Input-Type 3-phase diode rectifiers offer several merits, e.g., compact size, light weight and cheap and thus, those are widely applied in practice. Though, their input currents distort significantly and it can cause harmonic pollution in power systems. Thus, it is essential to obtain solutions with maintaining the merits. In the Choke-Input-Type diode rectifiers, multiple three-phase...
In this project level shifted bipolar sinusoidal Pulse Width Modulation techniques are developed over new symmetrical seven level inverter topology. The proposed SPWM techniques are Phase Disposition Technique, Phase Opposition Disposition Technique and Alternate Phase Opposition Disposition Technique which are under hard switching techniques. More number of components, complex switching patterns...
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...
Different electrical power formulations have been developed to improve the quality of electrical power. These developments have served to establish different strategies for the control of active power filters (APF). However, most strategies have been applied to APF of parallel connection. These type of compensators are only effective in compensating loads of the harmonic current source type (HCS)...
This paper presents a 27-Level asymmetric multilevel shunt active power filter topology that allows the compensation of a nonlinear load, as well as the DC voltage regulation thanks to a comprehensive control strategy. The topology considers the ratio 9∶3∶1 in order to generate the AC waveform with a simple staircase modulation algorithm. The dynamic model of the proposed topology is obtained and...
Now-a-days, sustainability of power quality is a major concern. Speed control of an AC motor is required for several industrial applications, but is often difficult to achieve as the AC motor runs at fixed speed. Hence, power electronic devices are introduced in the system. Due to the development in power electronic devices with improved dependability and cheaper cost, results in the growth of modern...
In the distribution system grid the operation of power quality conditioner has increased during the past few years due to the constant increase of nonlinear loads linked to the electrical network. It is feasible to ensure a modulated voltage for the loads, balanced and with low harmonic distortion and at the same time leaving undistorted current from the utility grid by employing a Dual topology of...
This paper deals with the control design of an asymmetrical cascaded multilevel inverter. This structure therefore provides the capability to produce higher voltages at higher speeds with low switching frequency which has inherent low switching losses and high converter efficiency. Selective harmonic elimination(SHE) for asymmetrical multilevel CHB inverter control is proposed. The technique utilized...
This paper proposes a new circuit topology of MMC for DC to AC applications. The main advantage of the proposed topology is the elimination of lower arms of conventional MMC. Additionally, the DC bus voltage magnitude is half compared to conventional MMC. This is achieved by replacing the lower arms of conventional MMC topology with LC filter. The LC filter is designed to be a second order band stop...
Low frequency switching of voltage source inverters generates low order harmonic voltages in the output causing torque and speed ripple. In this paper, a multilevel space vector diagram formed by nine-concentric octadecagons (polygons with 18 sides) using a single DC source is presented which eliminates lower order harmonics till seventeenth order from the phase voltage output over the entire modulation...
A total harmonic distortion (THD) optimization based 5-level selective harmonic elimination pulse width modulated (SHE-PWM) single-phase reduced device count (RDC) voltage source inverter (VSI) is presented in this paper. A MATLAB program is developed for offline calculation of switching angles based on quarter wave (QW) symmetry of the output and overall THD optimization method of SHE-PWM. The inverter...
This paper presents a single stage SPV (Solar Photovoltaic) system using an adaptive novel control (ANC) Scheme. The SPV system includes SPV array, VSC (Voltage Source Converter), ripple filter, nonlinear loads and three-phase distribution network. As compared to two stage systems, a single stage SPV system is developed, resulting in depletion in cost, size, weight and an improved efficiency. The...
Widely distributed single-phase power electronic rectifier loads are increasing source of harmonics in power distribution system. These harmonics have many well known adverse impacts on the power system. So it is necessary to improve the power quality of the rectifiers. This paper presents a novel single phase rectifier in which capacitors are used in parallel with diodes in one leg of the rectifier...
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