EPE Association: EPE 2014 - LS2d: Solar Energy Systems

EPE 2014 - LS2d: Solar Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 05: Renewable Energy Power Systems > EPE 2014 - LS2d: Solar Energy Systems

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   Development and implementation of a dynamic PV emulator with HMI interface for high power inverters
By DANIEL HEREDERO-PERIS, Macià CAPÓ-LLITERAS, Carlos MIGUEL-ESPINAR, GABRIEL GROSS, Tomas LLEDÓ-PONSATI, DANIEL MONTESINOS-MIRACLE [View]
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Abstract: In this paper a 10 kVA photovoltaic emulator is presented. The system implemented generates photovoltaicV-I characteristic curves to analyse and test maximum power point tracking algorithms of realphotovoltaic inverters according to the standard EN50530. The power converter used includes a threephaseac-dc active rectifier. The power stage selected allows to minimize the harmonic current contentand permits to be closed to the unity power factor with a fast response. The emulator is controlled by adigital signal processor that communicates with a human-machine-interface. It allows to emulate staticand dynamic responses. Furthermore, the interface is also capable of simulating weather evolution andsituations under shaded conditions.

   Impact of PV String Shading Conditions on Panel Voltage Equalizing Converters and Optimization of a Single Converter System with Overcurrent Protection
By Matthias KASPER, Stefan HERDEN, Dominik BORTIS, Johann Walter KOLAR [View]
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Abstract: Unequal irradiance of series connected PV panels in a string strongly decreases the output power of thePV system, as either PV panels are bypassed or operated below their MPP. By connecting balancingconverters around each pair of adjacent PV panels, all panels can maintain the operation close to theirMPP regardless of any mismatched operating condition. In this paper a balancing converter conceptwith ZVS is introduced and the operation of a string of PV panels equipped with balancing convertersis analytically described. Based on this analytic framework, different examples of shading scenarios ofa PV string are examined regarding the average inductor current values that occur within the balancingmodules, in order to derive the required specifications of a balancing converter. Moreover, a two-levelovercurrent protection concept is introduced which enables to keep all balancing converters within thesafe operating area at all times, even at shading conditions with high mismatch. Furthermore, the designoptimization of a highly efficient PV voltage balancing converter with a wide input voltage range isexplained in detail and finally the concept is verified with measurement results of a demonstrator system.

   Large Scale Solar Power Plant in Nordic Conditions
By Antti KOSONEN, Jero AHOLA, Christian BREYER, Albert ALBÓ [View]
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Abstract: Solar power plants have become common during last few years in the middle Europe, especially in Germany. On the other hand, solar power has not grown in the Nordic countries, in spite of Denmark after the favorable net-metering legislation in the year 2011. Finland is one of these countries that has low solar power capacity. Many Nordic countries, such as Finland, have relatively low electricity price that is supposed to cause challenges for the viability of solar power production without legislation or does it_ In this paper, the potential for solar power production in Nordic conditions is studied, simulated, and measured. A large scale solar power plant is built to Lappeenranta University of Technology (LUT).

   Maximum power point tracking method for improved string photovoltaic system under partially shaded conditions
By Pengfei LI, Guanjian WANG, Yuling LI, Dehua ZHANG [View]
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Abstract: This paper proposes an improved string photovoltaic (PV) system to increase system power quality. The proposed structure can change operation mode according to the degree of PV strings shaded. When all strings are uniform, the system works in central mode. When one or more strings are non-uniform with others, the non-uniform strings separate from central mode, and operate in string mode. In this condition, multiple peaks can be exhibited on the power-voltage characteristic curve. To solve this problem, a global searching maximum power point tracking (MPPT) method is presented and implemented. Simulation and experimental results indicate the feasibility of the proposed work.

EPE 2014 - LS2d: Solar Energy Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 05: Renewable Energy Power Systems > EPE 2014 - LS2d: Solar Energy Systems
	[return to parent folder]

	Development and implementation of a dynamic PV emulator with HMI interface for high power inverters By DANIEL HEREDERO-PERIS, Macià CAPÓ-LLITERAS, Carlos MIGUEL-ESPINAR, GABRIEL GROSS, Tomas LLEDÓ-PONSATI, DANIEL MONTESINOS-MIRACLE	[View] [Download]
Abstract: In this paper a 10 kVA photovoltaic emulator is presented. The system implemented generates photovoltaicV-I characteristic curves to analyse and test maximum power point tracking algorithms of realphotovoltaic inverters according to the standard EN50530. The power converter used includes a threephaseac-dc active rectifier. The power stage selected allows to minimize the harmonic current contentand permits to be closed to the unity power factor with a fast response. The emulator is controlled by adigital signal processor that communicates with a human-machine-interface. It allows to emulate staticand dynamic responses. Furthermore, the interface is also capable of simulating weather evolution andsituations under shaded conditions.

	Impact of PV String Shading Conditions on Panel Voltage Equalizing Converters and Optimization of a Single Converter System with Overcurrent Protection By Matthias KASPER, Stefan HERDEN, Dominik BORTIS, Johann Walter KOLAR	[View] [Download]
Abstract: Unequal irradiance of series connected PV panels in a string strongly decreases the output power of thePV system, as either PV panels are bypassed or operated below their MPP. By connecting balancingconverters around each pair of adjacent PV panels, all panels can maintain the operation close to theirMPP regardless of any mismatched operating condition. In this paper a balancing converter conceptwith ZVS is introduced and the operation of a string of PV panels equipped with balancing convertersis analytically described. Based on this analytic framework, different examples of shading scenarios ofa PV string are examined regarding the average inductor current values that occur within the balancingmodules, in order to derive the required specifications of a balancing converter. Moreover, a two-levelovercurrent protection concept is introduced which enables to keep all balancing converters within thesafe operating area at all times, even at shading conditions with high mismatch. Furthermore, the designoptimization of a highly efficient PV voltage balancing converter with a wide input voltage range isexplained in detail and finally the concept is verified with measurement results of a demonstrator system.

	Large Scale Solar Power Plant in Nordic Conditions By Antti KOSONEN, Jero AHOLA, Christian BREYER, Albert ALBÓ	[View] [Download]
Abstract: Solar power plants have become common during last few years in the middle Europe, especially in Germany. On the other hand, solar power has not grown in the Nordic countries, in spite of Denmark after the favorable net-metering legislation in the year 2011. Finland is one of these countries that has low solar power capacity. Many Nordic countries, such as Finland, have relatively low electricity price that is supposed to cause challenges for the viability of solar power production without legislation or does it_ In this paper, the potential for solar power production in Nordic conditions is studied, simulated, and measured. A large scale solar power plant is built to Lappeenranta University of Technology (LUT).

	Maximum power point tracking method for improved string photovoltaic system under partially shaded conditions By Pengfei LI, Guanjian WANG, Yuling LI, Dehua ZHANG	[View] [Download]
Abstract: This paper proposes an improved string photovoltaic (PV) system to increase system power quality. The proposed structure can change operation mode according to the degree of PV strings shaded. When all strings are uniform, the system works in central mode. When one or more strings are non-uniform with others, the non-uniform strings separate from central mode, and operate in string mode. In this condition, multiple peaks can be exhibited on the power-voltage characteristic curve. To solve this problem, a global searching maximum power point tracking (MPPT) method is presented and implemented. Simulation and experimental results indicate the feasibility of the proposed work.