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Driven by economic and environmental concerns, countries around the world are demanding renewable energy resources (RES). Among the available renewable resource; wind and solar energy are promising resources. Recent energy regulations in Jordan have allowed the customers to install their own Photovoltaics generation (PVs) to cover their full energy consumption. This paper investigates the impact of...
This paper proposes a multilevel open-end six-phase motor drive. The system is composed of six isolated three-leg inverters and is adequate for high-power systems with voltage rating restrictions. The system model and a simple space vector pulse-width modulation (PWM) based on three similar individual planes are presented. Specific voltage vector application sequences that reduce the stator voltages...
In this paper, a new hybrid multilevel six-phase machine drive system topology is proposed and investigated. Such topology is composed of two three-level three-phase neutral-point-clamped (NPC) inverters and a traditional two-level three-phase voltage source inverter (VSI) with isolated DC-links feeding the open-end windings (OEW) of a six-phase induction motor (SPIM). The system model, operating...
Four unidirectional AC-DC-AC three-level and two-level three-leg converters are proposed in this paper. This converters are composed of an unidirectional rectifier and a bidirectional inverter, using three-level and two-level legs and an unidirectional NPC leg at rectifier side. When compared with the two-level leg, the three-level leg presents voltage stress reduction on switches for the same DC-link...
Obtaining better harmonic profile at relatively lower switching frequencies is one of the key tasks in the present day power electronics world. Several pulse width modulation (PWM) techniques have been developed earlier in time, to reduce the harmonic content from the output of the inverter. Dodecagonal space vector generation scheme is one of them, which eliminates the most dominant lower order harmonics...
This paper presents an enumerated model predictive control (MPC) based method for the dynamic voltage restorer (DVR), which consists of a series-connected transformer and a voltage source inverter. The filter adopted in the DVR is a LC filter with a damping resistor. The design of the discrete model for the voltage source inverter and the corresponding controller are discussed in this paper. The proposed...
A conventional 3-level PWM Inverter and a Cascaded Multilevel Inverter, both rated at 230Vrms voltage output and 3KW are analysed using the Switching Function. The PWM signal for the 3-level inverter is derived by applying the Switching Function Technique to the equal area principle. For the Cascaded Multilevel Inverter the Switching Function Technique is initially applied to each H-bridge, and then...
This paper presents the study and analysis on the impacts of the insertion of a damper circuit in an LCL passive filter utilized to filter DC/AC inverter's output voltage. The damper is used to reduce peak resonance on its frequency response curves. The existing resonance frequency can make the filtered inverter output voltage become weak and unstable. One of existing solutions to overcome this problem...
The real-world performance of inverters is investigated across their full range of operation, concentrating on harmonic distortion and power factor. The inverters under review are representative of a cross-section of the UK market in terms of price and device quality. They include both voltage and current source converter topologies. The test results are compared against the relevant clauses of the...
Photovoltaic (PV) energy has been widely interested today because it is clean and endless energy without causing pollution. To produce electricity from solar energy, it would be required an inverter to convert the direct current into alternating current. The inverter is the cause of problems that affect the stability of the power system because it is a switching device served to adjust the frequency...
This paper presents an analytical method developed to explain the mechanism of harmonic transfer between the ac and dc sides of a single-phase inverter in a PV microgrid. The model explains how the feed-forward of the current from the ac side of the PV-inverter into the control system, causes even harmonics on the dc voltage. It further shows how the controller's feedback of the dc bus voltage carrying...
The relative amount of distortion in the current generated by a PV system under low solar irradiance is known to be quite significant. This paper analyzes such distortion on the utility-side of the interconnection transformer thus including its excitation current. An approximate method that reveals the imbalance and distortion of both the phase and line currents in a 3-legged transformer is presented...
Even when audio equipment, the sound quality of music playback is deteriorated by various factors. This study examines the deterioration in sound quality due to the type and state of power supply used in audio equipment. We consider that the power supply of the equipment influences the AC potential of the equipment, the propagation noise between parts of the equipment and the audio signal, in that...
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)...
This paper presents a high-voltage direct current (HVDC) transmission system using a 12-pulse thyristor inverter without AC grids' low-order harmonic distortions. Although it is effective to adopt a line-commutated converter (LCC) HVDC transmission system for connecting offshore wind farms, it generates unwanted harmonic distortions. We have proposed a novel harmonics elimination method using a three-winding...
Current harmonics produced by power converters are strictly limited to ensure power quality in renewable energy integration systems. Quasi Z-source Inverter (qZSI) is used in such systems as a single stage Buck-Boost DC-AC converter. In this paper, the harmonic performance of space-vector modulated (SVM) three phase grid-tied qZSI is investigated. Traditional SVM and Modified-SVM schemes are analytically...
India, being a tropical country has rich solar resource. Hence, with a strong commitment towards increasing its renewable share, India has set a target to install 100 GW of solar generation capacity by 2022 in which 40 GW would be grid-connected rooftop solar photovoltaic (PV) systems. This paper examines the potential, importance, foreseen challenges, outlook, and technical impact due to large-scale...
The space vector approach in real time PWM offers a variety of switching patterns for effective control of induction motor drives. The flexibility of placing zero vector results various advanced bus clamping PWM like continuous or discontinuous SVPWM. The performance of different PWM strategies subject to maximum switching frequency of inverter is analysed in terms of the Total Harmonic Distortion...
When considering grid integration, it is recognized that wind farms are able to bring about power quality impacts at the connection point. Focusing the attention towards this framework, a large amount of effort has been given to achieve the required level of compatibility between the wind turbine and the AC grid. Amongst the various existing power quality phenomena, harmonic distortion emerges as...
This article deals with the simulation of the power converter with voltage-source inverter and sine-filter. The repetitive control system was designed. The existing power converter has a control system which makes Fourier transform of the output voltage to inject these harmonics with opposite phase. The new proposed system based on repetitive controller which is much simpler and with smaller CPU load...
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