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This paper presents a computer-controlled three-phase AC power source for use in standard tests of electrical power devices. Developed with a multivariable repetitive robust model reference adaptive controller (MIMO RMRAC-RP), this scheme is able to generate sinusoidal waveforms with adjustable amplitudes and frequencies, as well as several arbitra...
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... − 1 2 − 3 2 In this point is interesting to note that y m α and y m β are independent orthogonal variables . Such as shown in the Fig. 4, the control laws u α and u β and the tracking errors e α and e β are computed separately for each axis α and β , respectively, using a single RMRAC controller for each axis. Using the T transformation, the load measured voltages variables, V r , V s and V t are converted in orthogonal output voltage variables, V α and V β . The system output errors, e α and e β , are obtained through a comparison of these variables with that ones from the reference model, y m α and y , respectively. From these errors, the RMRAC algorithm computes separately the orthogonal control variables, u α and u β . Then, the three-phase control variables, u u , u v and u w , obtained by the T -1 transformation, are converted in PWM signals, ∆ Tu, ∆ Tv and ∆ Tw, where ∆ T i ( k ) = T 2 + T u i ( k ) E , u i ( k ) ≤ E / 2 and T is the sampling period. Then, the PWM inverter generates the LC filter input voltages, Vu, Vv and Vw, ...
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Esse trabalho apresenta a implementação de uma Fonte de Alimentação CA que permite a adição de conteúdo harmônico. A fonte proporciona a geração de sinais genéricos, além da possibilidade de programação de distúrbios comuns em redes, como flutuações e transitórios. Para os circuitos de potência são propostos conversores com comutação suave, que aumentam a eficiência e possibilitam maior compactação. A geração dos sinais é feita por um circuito baseado em DSP, que também é responsável pela supervisão, sinalização, interface com o usuário e comunicação serial com PC. São apresentados resultados experimentais para diferentes tipos de formas de onda, comprovando a eficácia da solução proposta.
This paper presents the design and implementation of a 5kW programmable three-phase harmonic generator, which is capable of generating sinusoidal output voltages with adjustable output amplitude and frequency over a wide range as well as arbitrary waveforms. The considered harmonic generator is a linear power amplifier type. This system consists mainly of a power converter to generate and amplify waveform signals, a controller to control the desired output signal and measure the output parameters including voltage and current, and a control program to set the desired output and display the output values. The prototype programmable three-phase harmonic generator has been constructed and tested. Test results show that the developed programmable three-phase harmonic generator performs well.
This paper presents a programmable single-phase ac power source that provides a sinusoidal output voltage with an adjustable output amplitude and frequency over a wide range as well as an arbitrary waveform. The ac power source under consideration have a linear power amplifier. The desired output values can be programmed with a personal computer. The power source operates at 220[V]/60[Hz] mains and the output voltage is isolated from the input circuit. The system consists mainly of a power converter to generate and amplify the waveform signal, a controller to control the desired output signal and measure the output parameters, and a control program to set the desired output and display the values. The prototype ac power source was constructed and tested with the results demonstrating a good performance.
Resumo-Esse trabalho apresenta a implementação de uma Fonte de Alimentação CA que permite a adição de conteúdo harmônico. A fonte proporciona a geração de sinais genéricos, além da possibilidade de programação de distúrbios comuns em redes, como flutuações e transi-tórios. Para os circuitos de potência são propostos con-versores com comutação suave, que aumentam a eficiên-cia e possibilitam maior compactação. A geração dos si-nais é feita por um circuito baseado em DSP, que tam-bém é responsável pela supervisão, sinalização, interface com o usuário e comunicação serial com PC. São apre-sentados resultados experimentais para diferentes tipos de formas de onda, comprovando a eficácia da solução proposta.
In this study, adaptive predictive voltage control of three phase pulse-width modulated voltage source converter for uninterruptible power supply application is investigated. In recent years, predictive control strategies have attracted considerable attention due to their simple concepts and inherent adaptability to digital implementation. In contrast, sensitivity to parameter uncertainties and computational delays can degrade the performance and even end to instability. So in this paper and in order to overcome these problems, an improved predictive control based on the model reference adaptive observer is proposed. Adaptive observer helps compensate the computation and system delays and reduce the system sensitivity to parameter uncertainties. The proposed adaptive observer estimates the system states and disturbance inputs for the one sample ahead. The performance of the proposed method is investigated under various conditions. The simulation results confirm the excellent performance of the proposed technique in steady-state and transient conditions.
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strong authentication that withstands different known attacks. abstract.
Up to recently the harmonic generation has deteriorated the quality of electricity and affected the performance on the electrical installation including OA, FA, IT devices and so on. Some studies of harmonic affects in presumption according to qualitative analysis. So in order to research the harmonic affect on the electrical installation according to quantitative analysis and gather reliable data over and over again, it is necessary to develop an AC power source which is capable of generating some harmonics. In this paper, we described about realization of AC power source which can produce and compose harmonics for the analysis of accident due to harmonics.
This paper proposes a new multivariable model reference adaptive controller (MIMO RMRAC). The development of this controller involves: a) the characterization of the integral structure of the modeled part of the multivariable plant and the associated parameterization of the controller structure; b) the development of a robust adaptive law based on a modified least-squares algorithm for adjusting the controller parameters so that the closed-loop plant is globally stable despite the presence of unmodeled dynamics and bounded disturbances.
