EPE Association: EPE 2005 - Topic 14-2 - LS: Power electronics for distributed generation

EPE 2005 - Topic 14-2 - LS: Power electronics for distributed generation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 14: POWER ELECTRONICS IN ELECTRICAL ENERGY GENERATING SYSTEMS > EPE 2005 - Topic 14-2 - LS: Power electronics for distributed generation

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   A Modified Modulation Control of a Single-Phase Inverter with Enhanced Power Decoupling for an AC Photovoltaic module
By YASUI Kiyoto; ISHIKAWA Mutsuo; SHIMIZU Toshihisa; HIRAO Takashi [View]
[Download]

Abstract: A photovoltaic AC module system has been expected to be installed on the private residences. The AC module inverter needs an active power decoupling circuit in order to enlarge the lifetime and to decrease the volume of the inverter by eliminating a large electrolytic capacitor on the input DC-bus. This paper proposes novel flyback-type single-phase grid interactive inverters with two modulation methods, Sequential Magnetizing Modulation (SMM) method and Time-shared Magnetizing Modulation (TMM) method, and discuss those of the operation characteristics and the conversion efficiency. It is verified that the TMM method has advantage with respect to the conversion efficiency while the SMM method causes results in low conversion efficiency. However, current distortion of AC output remains on the TMM method due to the turn-on/off delay on the switching device. The influence of the turn-on/off delay upon the current waveform distortion is analyzed and a delay time compensation is proposed. Since the proposed compensation method achieves low distortion waveform and high conversion efficiency as well, it is concluded that the proposed inverter is one of the optimal method for the AC module systems.

   A new Application of the Coupled-Inductors SEPIC Converter to obtain I-V and P-V Curves of Photovoltaic Modules
By MARTINEZ BOHORQUEZ Miguel ANgel; DURAN ARANDA Eladio; ENRIQUE GOMEZ Juan Manuel; ANDUJAR MARQUEZ Jose Manuel; SIDRACH DE CARDONA Mariano; CARRETERO RUBIO JesuS [View]
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Abstract: The achievement of I-V and P-V curves of photovoltaic modules gives the possibility to obtain the exact operation point, the short-circuit current (Isc), the open-circuit voltage (Voc), the maximum power point (MPP) and the Fill Factor (FF). These are significant parameters for the design and for the start-up of a photovoltaic installation. In this paper, we propose and analyse by means of simulation the capacity of the SEPIC (Single-Ended Primary Inductance Converter) structure to implement I-V and P-V curves tracers of photovoltaic modules, mainly because the SEPIC topology presents the capability of buck-boost conversion. Thanks to this property, a complete sweep of the voltage and the current given by a photovoltaic panel can be made, including Voc and Isc. This structure is implemented by coupled inductors and presents two fundamental advantages: 1) it allows to emulate a resistance at the input converter within the range [0,¥) and 2) it guarantees a null ripple in the input current when the magnetic coupling of his two inductors fulfils ZRC (Zero Ripple Condition).

   Fuel Cell Inverter System with Integrated Auxiliary Supply
By FROeHLEKE Norbert; BOeCKER Joachim; KUNZE JueRgen; IDE Peter; WETZEL Hermann [View]
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Abstract: An innovative, flexible modular concept for a fuel cell inverter system with optimized overall efficiency for a domestic heater is presented and compared with conventional and fully bidirectional solutions. Three types of bidirectional insulated DC/DC converters are discussed. The design should take into account the asymmetrical flow of power from the fuel cell to the mains and back to the fuel cell for the supply of the auxiliary equipment. An integrated auxiliary power supply turned out to be best, which is fed during normal operation directly by the fuel cell, and, during start-up by the mains. A loss analysis for both operation modes has been carried out as support for the final design decision.

   Implementation of Single Phase Utility Interactive Inverter using FPGAbased Hardware Contorller
By AOKI Kenji; YOKOYAMA Tomoki; KOMIYAMA Tsuyoshi; SHIMADA Eigo [View]
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Abstract: In this paper, a new control method for the utility interactive inverter based on the deadbeat control with FPGA based hardware controller is proposed. Deadbeat control is one method to ensure the output voltage or current matches to the references at the sampling instant, so adopting this control method to the utility interactive inverter, the response of the system is much improved with small LC filter component compared with the conventional PI control, which results in the improvement of the cost performance of the inverter. Also, to utilize the capability of FPGA based hardware controller, a multi sampling method is proposed, which enables 1MHz sampling while the carrier period to improve the control accuracy. All the control circuit for the proposed current control method using voltage deadbeat control and PLL control with quasi-dq transformation and multi sampling method are implemented in FPGA based hardware controller. The design concept of the controller is also described, and the advantages and the disadvantage are discussed through simulations and experiments.

EPE 2005 - Topic 14-2 - LS: Power electronics for distributed generation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 14: POWER ELECTRONICS IN ELECTRICAL ENERGY GENERATING SYSTEMS > EPE 2005 - Topic 14-2 - LS: Power electronics for distributed generation
	[return to parent folder]

	A Modified Modulation Control of a Single-Phase Inverter with Enhanced Power Decoupling for an AC Photovoltaic module By YASUI Kiyoto; ISHIKAWA Mutsuo; SHIMIZU Toshihisa; HIRAO Takashi	[View] [Download]
Abstract: A photovoltaic AC module system has been expected to be installed on the private residences. The AC module inverter needs an active power decoupling circuit in order to enlarge the lifetime and to decrease the volume of the inverter by eliminating a large electrolytic capacitor on the input DC-bus. This paper proposes novel flyback-type single-phase grid interactive inverters with two modulation methods, Sequential Magnetizing Modulation (SMM) method and Time-shared Magnetizing Modulation (TMM) method, and discuss those of the operation characteristics and the conversion efficiency. It is verified that the TMM method has advantage with respect to the conversion efficiency while the SMM method causes results in low conversion efficiency. However, current distortion of AC output remains on the TMM method due to the turn-on/off delay on the switching device. The influence of the turn-on/off delay upon the current waveform distortion is analyzed and a delay time compensation is proposed. Since the proposed compensation method achieves low distortion waveform and high conversion efficiency as well, it is concluded that the proposed inverter is one of the optimal method for the AC module systems.

	A new Application of the Coupled-Inductors SEPIC Converter to obtain I-V and P-V Curves of Photovoltaic Modules By MARTINEZ BOHORQUEZ Miguel ANgel; DURAN ARANDA Eladio; ENRIQUE GOMEZ Juan Manuel; ANDUJAR MARQUEZ Jose Manuel; SIDRACH DE CARDONA Mariano; CARRETERO RUBIO JesuS	[View] [Download]
Abstract: The achievement of I-V and P-V curves of photovoltaic modules gives the possibility to obtain the exact operation point, the short-circuit current (Isc), the open-circuit voltage (Voc), the maximum power point (MPP) and the Fill Factor (FF). These are significant parameters for the design and for the start-up of a photovoltaic installation. In this paper, we propose and analyse by means of simulation the capacity of the SEPIC (Single-Ended Primary Inductance Converter) structure to implement I-V and P-V curves tracers of photovoltaic modules, mainly because the SEPIC topology presents the capability of buck-boost conversion. Thanks to this property, a complete sweep of the voltage and the current given by a photovoltaic panel can be made, including Voc and Isc. This structure is implemented by coupled inductors and presents two fundamental advantages: 1) it allows to emulate a resistance at the input converter within the range [0,¥) and 2) it guarantees a null ripple in the input current when the magnetic coupling of his two inductors fulfils ZRC (Zero Ripple Condition).

	Fuel Cell Inverter System with Integrated Auxiliary Supply By FROeHLEKE Norbert; BOeCKER Joachim; KUNZE JueRgen; IDE Peter; WETZEL Hermann	[View] [Download]
Abstract: An innovative, flexible modular concept for a fuel cell inverter system with optimized overall efficiency for a domestic heater is presented and compared with conventional and fully bidirectional solutions. Three types of bidirectional insulated DC/DC converters are discussed. The design should take into account the asymmetrical flow of power from the fuel cell to the mains and back to the fuel cell for the supply of the auxiliary equipment. An integrated auxiliary power supply turned out to be best, which is fed during normal operation directly by the fuel cell, and, during start-up by the mains. A loss analysis for both operation modes has been carried out as support for the final design decision.

	Implementation of Single Phase Utility Interactive Inverter using FPGAbased Hardware Contorller By AOKI Kenji; YOKOYAMA Tomoki; KOMIYAMA Tsuyoshi; SHIMADA Eigo	[View] [Download]
Abstract: In this paper, a new control method for the utility interactive inverter based on the deadbeat control with FPGA based hardware controller is proposed. Deadbeat control is one method to ensure the output voltage or current matches to the references at the sampling instant, so adopting this control method to the utility interactive inverter, the response of the system is much improved with small LC filter component compared with the conventional PI control, which results in the improvement of the cost performance of the inverter. Also, to utilize the capability of FPGA based hardware controller, a multi sampling method is proposed, which enables 1MHz sampling while the carrier period to improve the control accuracy. All the control circuit for the proposed current control method using voltage deadbeat control and PLL control with quasi-dq transformation and multi sampling method are implemented in FPGA based hardware controller. The design concept of the controller is also described, and the advantages and the disadvantage are discussed through simulations and experiments.