EPE Association: EPE 2011 - LS5b: Topic 15: Integration of PV sources in the Grid

EPE 2011 - LS5b: Topic 15: Integration of PV sources in the Grid
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 15: Non-rotating power generation and storage systems > EPE 2011 - LS5b: Topic 15: Integration of PV sources in the Grid

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   Energy Efficiency Analysis of Grid-Connected PV Inverter with Storage Battery
By Chee Lim NGE, Ole-Morten MIDTGÅRD, Lars NORUM [View]
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Abstract: PV is an intermittent renewable power source. Grid-connected PV inverters conventionally use grid as the energy reservoir. As the level of PV penetration increases substantially in recent years, battery is proposed as the energy storage in grid-connected PV system. This is to increase on-site consumption, which in turn avoids grid voltage rise and reduces the loss in transmission line. Additionally, it allows PV inverter to dispatch power similar to the conventional power generations. This paper analyzes the overall efficiency of grid-connected PV inverter with storage battery using system level regression models. The analysis postulates nonlinear relation between the total power loss and the battery charging. Voltage droop battery charge controller that simplifies the efficiency optimization is developed based on the regression models. The analysis and the controller are verified by the component level power loss calculations. The controller is compared in simulation to the conventional constant-current/constant-voltage battery charging using PV outdoor measurement data.

   Fault Ride Through Capability for Solar Inverters
By Kansuke FUJII, Norikazu KANAO, Toshiya YAMADA, Yasuhiro OKUMA [View]
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Abstract: A solar inverter for utility scale has been developed in this paper, and the inverter has fault ride through (FRT) capability, which is now discussed in Japan and similar to requirement in U.S.A and Europe. This solar inverter consists of a boost chopper and a three-phase 2-level inverter, and the capacity covers from 20 kW to 600 kW. This paper first describes the FRT capability. Second, how to control the boost chopper and the inverter is shown. Especially, a new inverter current control to achieve FRT capability and dynamic voltage support (DVS) during a grid fault is proposed. After that, several results using an experimental model (5-kW solar inverter) are shown. Finally, results of a prototype model (20 kW), which has been installed in an actual grid, are presented.

   Necessity and possibilty of smart grid technology application on railway power supply system
By Hitoshi HAYASHIYA, Takayuki FURUKAWA, Hiroshi YOSHIZUMI, Takatoshi KONDO, Masayuki KITANO, Takashi AOKI, Takashi SUZUJI [View]
[Download]

Abstract: Basic study of smart grid technology application for railway power supply system has started to enhance eco-friendliness of railway transportation in our company, East Japan Railway Company, since 2009. In this paper, its necessity and future possibility is discussed to utilize regenerative energy and to realize reasonable power supply system based on practical load data.

EPE 2011 - LS5b: Topic 15: Integration of PV sources in the Grid
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 15: Non-rotating power generation and storage systems > EPE 2011 - LS5b: Topic 15: Integration of PV sources in the Grid
	[return to parent folder]

	Energy Efficiency Analysis of Grid-Connected PV Inverter with Storage Battery By Chee Lim NGE, Ole-Morten MIDTGÅRD, Lars NORUM	[View] [Download]
Abstract: PV is an intermittent renewable power source. Grid-connected PV inverters conventionally use grid as the energy reservoir. As the level of PV penetration increases substantially in recent years, battery is proposed as the energy storage in grid-connected PV system. This is to increase on-site consumption, which in turn avoids grid voltage rise and reduces the loss in transmission line. Additionally, it allows PV inverter to dispatch power similar to the conventional power generations. This paper analyzes the overall efficiency of grid-connected PV inverter with storage battery using system level regression models. The analysis postulates nonlinear relation between the total power loss and the battery charging. Voltage droop battery charge controller that simplifies the efficiency optimization is developed based on the regression models. The analysis and the controller are verified by the component level power loss calculations. The controller is compared in simulation to the conventional constant-current/constant-voltage battery charging using PV outdoor measurement data.

	Fault Ride Through Capability for Solar Inverters By Kansuke FUJII, Norikazu KANAO, Toshiya YAMADA, Yasuhiro OKUMA	[View] [Download]
Abstract: A solar inverter for utility scale has been developed in this paper, and the inverter has fault ride through (FRT) capability, which is now discussed in Japan and similar to requirement in U.S.A and Europe. This solar inverter consists of a boost chopper and a three-phase 2-level inverter, and the capacity covers from 20 kW to 600 kW. This paper first describes the FRT capability. Second, how to control the boost chopper and the inverter is shown. Especially, a new inverter current control to achieve FRT capability and dynamic voltage support (DVS) during a grid fault is proposed. After that, several results using an experimental model (5-kW solar inverter) are shown. Finally, results of a prototype model (20 kW), which has been installed in an actual grid, are presented.

	Necessity and possibilty of smart grid technology application on railway power supply system By Hitoshi HAYASHIYA, Takayuki FURUKAWA, Hiroshi YOSHIZUMI, Takatoshi KONDO, Masayuki KITANO, Takashi AOKI, Takashi SUZUJI	[View] [Download]
Abstract: Basic study of smart grid technology application for railway power supply system has started to enhance eco-friendliness of railway transportation in our company, East Japan Railway Company, since 2009. In this paper, its necessity and future possibility is discussed to utilize regenerative energy and to realize reasonable power supply system based on practical load data.