Simulation of AC/DC/AC converter fed RLC series circuit with asynchronous generator using Mat lab/Simulink
10 Mar 2011-pp 1-7
TL;DR: In this paper, the simulation studies of a 3-0 self-excited asynchronous generator (SEASG) fed RL load in conjunction with an AC/DC/AC converter fed series RLC circuit are described.
Abstract: This paper describes the simulation studies of a 3–0 self-excited asynchronous generator (SEASG) fed RL load in conjunction with an AC/DC/AC converter fed series RLC circuit. An attempt has been made to analyze the current, drawn by the rectifier circuit due to changes in the inverter frequency and their effects on the terminal voltage of the generator have been studied in open loop control. The frequency variation of the inverter fed series RLC circuit emulate the phenomenon of an inductive, capacitive reactance and resistive effect at the point of common coupling (PCC) of the generator terminal. This methodology could be used to inject leading / lagging VAR into the self-excited induction generator network (stand alone power generator), used to extract the power from wind, solar, Mini/Micro hydro energy sources. The proposed system has been simulated using power system tool box in Matlab/Simulink software. An attempt has been made to study the performances of SEASG using simulation. The results have been discussed and also presented.
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06 Oct 2020
TL;DR: In this article, an analytical method has been used to evaluate the performance of an artificial network used to measure conducted emission noise on the DC side due to the use of photovoltaic inverters.
Abstract: Artificial Network used to measure conducted emission noise on the DC side due to the use of photovoltaic inverters (DC-AN) has been characterized based on impedance and insertion loss using analytical method. Impedance and insertion loss compatibility requirements are regulated by CISPR standard 16-1-2:2014 to provide matching impedance with DC source and Equipment Under Test (EUT) in the radio frequency range from 150 kHz to 30 MHz. Circuit analysis using node analysis and loop analysis in the form of Laplace Transform is used to obtain the frequency response equations of impedance and insertion loss. Furthermore, the verification of the analytical method results is done by comparing it with the simulation method and the proposed DC-AN design based on analytical method has been made to validate DC-AN characteristic required by the standard. Finally, it could be concluded that the characteristics of DC-AN with analytical method are very close to the results of simulation method and the characteristic of the proposed DC-AN design is still within the tolerance limits allowed by the standard, which is ± 20% of the required impedance exact value and it has an insertion loss around of below -40 dB so it could be used to measure conducted emission noise.
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Cites background from "Simulation of AC/DC/AC converter fe..."
...The use of cable connectors would contribute the parasitic inductance and capacitance to the results of impedance and insertion loss measurements [15], [16]....
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References
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TL;DR: In this article, a practical method for calculating the harmonic currents of a three-phase bridge rectifier with a DC filter, taking into account the AC source reactance, is proposed.
Abstract: A practical method is proposed for calculating the harmonic currents of a three-phase bridge uncontrolled rectifier with a DC filter, taking into account the AC source reactance. The method is based on the frequency-domain method and the rectifier switching functions. Analytical equations for the harmonic currents on both the DC and AC sides are derived. The validity of the method is demonstrated by comparison with the results of time simulation. The approach can be extended to the harmonic analysis of a thyristor rectifier as well as a rectifier with unbalanced line conditions. >
106 citations
TL;DR: In this article, an electronic impedance controller is proposed to control the voltage and frequency of a stand-alone induction generator for cogeneration using a single turbine generator with hydraulic turbines.
Abstract: Induction generators with hydraulic turbines are often used for cogeneration The same turbine generator configuration can be used for stand-alone generation if an impedance controller is connected to the generator terminals; this configuration requires no hydraulic controls on the turbine The authors propose an electronic impedance controller to control the voltage and the frequency of a stand-alone induction generator The controller concept and its control range are discussed Particular attention is given to the harmonic distortion caused by the controller and measures to reduce these distortions The controller design is discussed, and data from an experimental generator set are provided to verify the proposed concept >
92 citations
01 Aug 1978
TL;DR: In this article, a self-excited induction generator/rectifier unit is proposed to operate in the linear region of the magnetisation curve while feeding a variable d.c. load at constant voltage.
Abstract: Schemes based on synchronous generators and high-voltage d.c. transmission are often used to exploit remote natural energy resources. However, unless the provision of synchronous power at the sending end is essential, such schemes are unnecessarily complex. The paper describes an alternative solution using self-excited induction-generator/controlled-rectifier units, which eliminate the problems of voltage and frequency variations inherent in self-excited induction machines. Theoretical and experimental results are provided showing that the self-excited induction generator can operate in the linear region of the magnetisation curve while feeding a variable d.c. load at constant voltage. It is also shown that the unit can be used to feed controllable power into an existing a.c. network through a d.c. transmission link.
90 citations
TL;DR: In this paper, a new method to improve the power factor of three-phase rectifiers is introduced, which is achieved with three bi-directional active switches rated at a small fraction of the total processed power, and gated at the line frequency.
Abstract: A new method to improve the power factor of three-phase rectifiers is introduced in this paper. The main features of the proposed circuit are low cost, small size, high efficiency, and simplicity. The power factor improvement is achieved with three bi-directional active switches rated at a small fraction of the total processed power, and gated at the line frequency. The principle of operation and design procedure, with a practical example, are also presented. The theoretical analysis was validated with experimental results from a laboratory prototype rated at 7.4 kW and connected to the 220-V 60-Hz AC system. The same circuit was also used in another prototype rated at 12 kW, with similar results.
74 citations
07 Oct 1990
TL;DR: In this article, a power factor improvement to a diode rectifier having a high-frequency inverter on the load is described based on dither signal effects for linearization of the nonlinear system.
Abstract: A power factor improvement to a diode rectifier having a high-frequency inverter on the load is described. The principle of the improvement is based on dither signal effects for linearization of the nonlinear system. A diode rectifier circuit, which can be regarded as a dead-zone element, is linearized based on this principle by adding a high-frequency dither signal to the input voltage. The output voltage of the high-frequency inverter is applied to the dither, which makes the input current of the rectifier sinusoidal. The dither rectifier circuit is composed of a diode voltage-doubler rectifier and a high frequency inverter that consists of only two switching elements. Its power factor is shown to be 99.2%, and the third and fifth harmonics are 10% and 0.4%, respectively. Uses of the high-frequency inverter in fluorescent lamp and switching power supply applications are discussed. >
60 citations