EPE Association: EPE 1997 â€“ 52: Dialogue Session DS4c: CONVERTER CONTROL: APPLICATION TO SINGLE PHASE SYSTEMS

EPE 1997 â€“ 52: Dialogue Session DS4c: CONVERTER CONTROL: APPLICATION TO SINGLE PHASE SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 52: Dialogue Session DS4c: CONVERTER CONTROL: APPLICATION TO SINGLE PHASE SYSTEMS

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   GENETIC-ALGORITHM CONTROLLED CONVERTERS FOR PHOTOVOLTAIC GENERATOR SYSTEMS
By T. Ohnuki; O. Miyashita; K. Ohniwa; T. Fujimaki [View]
[Download]

Abstract: A new maximum-power tracking method of a photovoltaic (PV) generator system using a genetic algorithm (GA) is presented. The output of the PV array varies with solar insolation and weather conditions. It is therefore necessary to provide control methods of power converters that maximize the output of the PV array. This paper introduces GA approaches for such maximization. The GA controller searches and finds out the optimal duty-factor of the converter so that the obtained output power approaches a maximum at any weather condition. This paper describes a new converter control method with a GA for PV generator systems, and discusses the system performances; dynamic characteristics including starting-up, and steady-state characteristics are presented. The usefulness of the proposed control method was verified by experiment.

   AN ORIGINAL CONTROL OF A BUCK CONVERTER WITH A REAL TIME CARD
By C. Batard; F. Levagueresse; C. Bergmann [View]
[Download]

Abstract: In the field of power circuits simulation, different approaches can be found. The purpose of this paper is to show the interest of an automatic approach for the perfecting of the regulation of the converters, which are described in the state space. In this paper, we will focus on the regulation of the load current in a basic DC-DC converter. Two different methods of regulation are studied: Integral proportional regulation and Zdan corrector. Simulations carried out with Matlab-Simulink are compared with experimental results.

   A NEW CURRENT FEEDBACK METHOD IN PWM CONVERTERS BY USING A TOROIDAL TRANSFORMER
By M. Sanz; A. Llombart; J. Sallan; A. A. Bayod [View]
[Download]

Abstract: A new current feedback method in DC/DC converters by using toroidal transformers is proposed. In most of the DC/DC converters the current provided to the load is composed by two components that run over different wires. In all those configurations, for instance: Buck, Boost, Cuk, Forward and Push-Pull converters, the proposed feedback method can be applied.

   AN APPROXIMATE DEAD-BEAT CONTROL STRATEGY FOR THE DESIGN OF FUNCTION REGULATORS IN DC/DC CONVERTERS
By F. Al-hosini [View]
[Download]

Abstract: An uncomplicated approximate dead-beat regulation method for switched-mode de-de converters is presented in this report. The method uses averaging techniques for the derivation of the proposed converter model equations, referred to as the governing equation, to be used for realization of the control circuit. The governing equations for multi-state converter topologies arc derived from basic two-state de-de converter circuits. Near optimum, inherently stable function controllers arc designed using this method with a minimum of theoretical analysis and with no control loop studies.

   THE ANALYTICAL DESCRIPTION OF IMPEDANCE CONVERSION IN THE STATIC CONVERTERS BY MEANS OF DISTRIBUTION THEORY
By G. Skarpetowski [View]
[Download]

Abstract: This article describes a mathematical approach - based on the theory of distribution - which has been utilised in the calculation of the impedance conversion through idealised static converters. The results of the analytical description allows the creation of complex converter system impedance models. As calculation examples three voltage source converters are used.

   VOLTAGE INJECTION CONTROL FOR POWER SUPPLIES IN RADAR APPLICATIONS
By C. Bunlaksananusorn; D. E. Macpherson; F. Fisher [View]
[Download]

Abstract: A new control method is proposed to enhance the dynamic response of power supplies that have a predictable load switching pattern, such as in radar applications. By injecting a small voltage into the control loop in advance of the load application, the dynamic response is greatly improved. Both experimental and simulated results are presented, demonstrating the robustness of the technique.

   A HIGH-PERFORMANCE DIGITAL PHASE-SHIFT CONTROLLER FOR THE ZERO-VOLTAGE-SWITCHED FULLBRIDGE CONVERTER
By I. K. Ellis; A. J. Forsyth; Z. Lu [View]
[Download]

Abstract: A 2.5kW, 50kHz digitally controlled Zero-Voltage-Switched Fullbridge Converter (ZVS-FBC) is presented. The features and difficulties of producing a digital controller operating at 100kHz are discussed. The controller is to implement sampling and calculation at this frequency in order to effect true half-cycle control of the converter. A digital signal processor-based solution is presented and the Ziegler-Nichols technique is used to produce a conservatively-designed control loop to test the feasibility of digital control at this frequency.

   A NOVEL CONTROL STRATEGY FOR IGBT-FOUR-QUADRANT CONVERTERS
By Dieter Maischak [View]
[Download]

Abstract: Because of their large power demand railway vehicles operated on the single-phase a.c.-line till now require GTO-equipped four-quadrant converters (4QC) operating at low switching frequency. The low switching frequency causes remarkable line current distortions and restricts the ability to attenuate unwanted line current harmonics. The rising power capability of IGBTs recently allows to build IGBT-equiped 40Cs with a considerably increased switching frequency. This paper presents a novel control strategy for IGBT-4QCs, which utilizes the upgraded switching frequency for low distorted line current, active attenuation of unwanted line current harmonics and a good dynamic performance.

   DESCRIBING FUNCTION-BASED ANALYSIS OF A CLASS OF PWM FEEDBACK CONTROL SYSTEMS
By A. Eisinberg; P. Muraca; G. Palmieri; C. Picardi [View]
[Download]

Abstract: This paper applies the describing function method to the PWM feedback control systems in order to find eliminating limit cycles conditions. Firstly, the paper presents an exact determination of the describing function associated to the modulator by using a suitable explicit expression of the switching instants extracted from the subharmonic modulating technique applied to the inverters. Then, the paper proposes a simple criterion that gives sufficient conditions to assure the absence of limit cycles of period multiple of that characteristic of the modulator. Some simulation results confirm the validity of the proposed criterion.

EPE 1997 â€“ 52: Dialogue Session DS4c: CONVERTER CONTROL: APPLICATION TO SINGLE PHASE SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 52: Dialogue Session DS4c: CONVERTER CONTROL: APPLICATION TO SINGLE PHASE SYSTEMS
	[return to parent folder]

	GENETIC-ALGORITHM CONTROLLED CONVERTERS FOR PHOTOVOLTAIC GENERATOR SYSTEMS By T. Ohnuki; O. Miyashita; K. Ohniwa; T. Fujimaki	[View] [Download]
Abstract: A new maximum-power tracking method of a photovoltaic (PV) generator system using a genetic algorithm (GA) is presented. The output of the PV array varies with solar insolation and weather conditions. It is therefore necessary to provide control methods of power converters that maximize the output of the PV array. This paper introduces GA approaches for such maximization. The GA controller searches and finds out the optimal duty-factor of the converter so that the obtained output power approaches a maximum at any weather condition. This paper describes a new converter control method with a GA for PV generator systems, and discusses the system performances; dynamic characteristics including starting-up, and steady-state characteristics are presented. The usefulness of the proposed control method was verified by experiment.

	AN ORIGINAL CONTROL OF A BUCK CONVERTER WITH A REAL TIME CARD By C. Batard; F. Levagueresse; C. Bergmann	[View] [Download]
Abstract: In the field of power circuits simulation, different approaches can be found. The purpose of this paper is to show the interest of an automatic approach for the perfecting of the regulation of the converters, which are described in the state space. In this paper, we will focus on the regulation of the load current in a basic DC-DC converter. Two different methods of regulation are studied: Integral proportional regulation and Zdan corrector. Simulations carried out with Matlab-Simulink are compared with experimental results.

	A NEW CURRENT FEEDBACK METHOD IN PWM CONVERTERS BY USING A TOROIDAL TRANSFORMER By M. Sanz; A. Llombart; J. Sallan; A. A. Bayod	[View] [Download]
Abstract: A new current feedback method in DC/DC converters by using toroidal transformers is proposed. In most of the DC/DC converters the current provided to the load is composed by two components that run over different wires. In all those configurations, for instance: Buck, Boost, Cuk, Forward and Push-Pull converters, the proposed feedback method can be applied.

	AN APPROXIMATE DEAD-BEAT CONTROL STRATEGY FOR THE DESIGN OF FUNCTION REGULATORS IN DC/DC CONVERTERS By F. Al-hosini	[View] [Download]
Abstract: An uncomplicated approximate dead-beat regulation method for switched-mode de-de converters is presented in this report. The method uses averaging techniques for the derivation of the proposed converter model equations, referred to as the governing equation, to be used for realization of the control circuit. The governing equations for multi-state converter topologies arc derived from basic two-state de-de converter circuits. Near optimum, inherently stable function controllers arc designed using this method with a minimum of theoretical analysis and with no control loop studies.

	THE ANALYTICAL DESCRIPTION OF IMPEDANCE CONVERSION IN THE STATIC CONVERTERS BY MEANS OF DISTRIBUTION THEORY By G. Skarpetowski	[View] [Download]
Abstract: This article describes a mathematical approach - based on the theory of distribution - which has been utilised in the calculation of the impedance conversion through idealised static converters. The results of the analytical description allows the creation of complex converter system impedance models. As calculation examples three voltage source converters are used.

	VOLTAGE INJECTION CONTROL FOR POWER SUPPLIES IN RADAR APPLICATIONS By C. Bunlaksananusorn; D. E. Macpherson; F. Fisher	[View] [Download]
Abstract: A new control method is proposed to enhance the dynamic response of power supplies that have a predictable load switching pattern, such as in radar applications. By injecting a small voltage into the control loop in advance of the load application, the dynamic response is greatly improved. Both experimental and simulated results are presented, demonstrating the robustness of the technique.

	A HIGH-PERFORMANCE DIGITAL PHASE-SHIFT CONTROLLER FOR THE ZERO-VOLTAGE-SWITCHED FULLBRIDGE CONVERTER By I. K. Ellis; A. J. Forsyth; Z. Lu	[View] [Download]
Abstract: A 2.5kW, 50kHz digitally controlled Zero-Voltage-Switched Fullbridge Converter (ZVS-FBC) is presented. The features and difficulties of producing a digital controller operating at 100kHz are discussed. The controller is to implement sampling and calculation at this frequency in order to effect true half-cycle control of the converter. A digital signal processor-based solution is presented and the Ziegler-Nichols technique is used to produce a conservatively-designed control loop to test the feasibility of digital control at this frequency.

	A NOVEL CONTROL STRATEGY FOR IGBT-FOUR-QUADRANT CONVERTERS By Dieter Maischak	[View] [Download]
Abstract: Because of their large power demand railway vehicles operated on the single-phase a.c.-line till now require GTO-equipped four-quadrant converters (4QC) operating at low switching frequency. The low switching frequency causes remarkable line current distortions and restricts the ability to attenuate unwanted line current harmonics. The rising power capability of IGBTs recently allows to build IGBT-equiped 40Cs with a considerably increased switching frequency. This paper presents a novel control strategy for IGBT-4QCs, which utilizes the upgraded switching frequency for low distorted line current, active attenuation of unwanted line current harmonics and a good dynamic performance.

	DESCRIBING FUNCTION-BASED ANALYSIS OF A CLASS OF PWM FEEDBACK CONTROL SYSTEMS By A. Eisinberg; P. Muraca; G. Palmieri; C. Picardi	[View] [Download]
Abstract: This paper applies the describing function method to the PWM feedback control systems in order to find eliminating limit cycles conditions. Firstly, the paper presents an exact determination of the describing function associated to the modulator by using a suitable explicit expression of the switching instants extracted from the subharmonic modulating technique applied to the inverters. Then, the paper proposes a simple criterion that gives sufficient conditions to assure the absence of limit cycles of period multiple of that characteristic of the modulator. Some simulation results confirm the validity of the proposed criterion.