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In this paper a generalized formulation for Selective Harmonic Mitigation Pulse Amplitude Modulation (SHM-PAM) has been presented to control Cascaded H-bridge (CHB) inverter with non-equal DC sources. Consistent with the proposed SHM-PAM technique, switching angles are attained constant while the calculated magnitudes of DC sources vary linearly for all modulation indexes (ma). In fact, in the SHM-PAM,...
Modular Multilevel Converter (MMC) technology is rapidly evolving, and research is ongoing to make the MMC suitable for more applications. This topology comprises multiple Sub-Modules (SM) to form the output voltage levels with lower order harmonic contributions. In this paper, a reconfiguration control method for continuous operation during bypassed faulty SM is presented. The method accomplish to...
In this paper, a three-phase five level inverter with new balancing algorithm is proposed using Selective Harmonics Elimination PWM. The inverter is fed photovoltaic generator as dc source. 36 redundant vectors are making use for the 12 unbalance cases of four capacitor voltages instead of 24 cases presented in the previous works. The obtained results show that the frequency of the PWM is unchanged.
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...
Space vector pulse width modulation (SVPWM) is widely used because of their easier digital realization and better DC bus utilization and lower THD. Various types of SVPWM strategies exist. The hybrid SVPWM strategy considers various SVPWM sequences and places the best performance sequence for a given reference vector and it proves to be superior in comparison with the conventional strategies. This...
Repetitive control (RC) scheme presents an attractive solution to achieve excellent steady-state tracking error and low total harmonic distortion (THD) for periodic signals. RC can produce extremely large gains at fundamental and each harmonic frequency of reference signal to achieve all harmonics suppression. However, a DC-AC inverter always has uneven THD distribution, e.g. THD concentrates at 4fc...
Inter-turn insulation failure in induction motor results in complete or developing winding short circuit. Stator winding fault leads to an unbalance in the three phases of the motor leading to a faulty induction motor with increased time and space harmonics of flux. This can lead to uneven distribution of air gap flux and increase in torque ripple. The condition is worsened due to an unbalance in...
This paper presents a step by step modeling of a new improved hybrid photovoltaic fed distributed static compensator (PV-DSTATCOM) in a-b-c reference frame. Further the system average model is transformed to orthogonal synchronous (d-q) reference frame. The new improved PV-DSTATCOM is used to compensate the current distortion and reactive power, generated by a non-linear three phase bridge uncontrolled...
Considering the ongoing paradigm shift of large scale solar plants from central inverters to multistring inverters, new associated logistic requirements have highlighted the need to lower the weight of power converters without compromising efficiency and reliability. To meet this need, Silicon carbide based semiconductors are considered an enabling technology as they allow weight reduction in power...
In this paper a simple control method involving new insertion index selection scheme for control of Modular Multilevel Converters (MMC) is proposed. In contrast with classical closed-loop methods, where all available arm voltages are measured and used in the generation process of insertion indices, this method uses available average voltage, i.e. the arithmetic mean of available upper and lower arm...
This paper proposes a configuration based on an a PR controller to enhance the power quality of a Single-Phase Five-Level Inverter (SPFLI). A sliding mode control is used to compensate the voltage harmonics and regulate the load supply. The proposed configuration implementing a sliding mode controller, a resonance regulator helps improving the dynamic response of the system and may target any specified...
The main purpose of this paper is the harmonic power flow in multiphase unbalanced radial distribution systems in the presence of non-linear loads and reactive components. It is important to have analytical methodologies to assess the impact and consequences of non-linear loads and shunt capacitors on voltage profile and harmonic distortion in each bus in the power systems. The presented power flow...
This paper proposes a modeling and control to enhance a grid on/ofï operation of a single-phase system consisting of a Single-Phase Five-Level Inverter (SPFLI). The Sliding mode control is adopted to compensate the current harmonics, the reactive power and the regulation of the DC bus voltage at the PCC during grid operation. The renewable energy based PMSG wind turbine is used to reduce the energy...
This paper presents a new asymmetrical single-phase multilevel inverter topology capable of producing nine-level output voltage with reduce device counts. In order to obtain the desired output voltage, dc sources are connected in all the combination of addition and subtraction through different switches. Proposed topology results in reduction of dc source, switch counts, losses, cost and size of the...
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