EPE Association: EPE 2013 - LS6b: Converters for Energy Storage and their Control

EPE 2013 - LS6b: Converters for Energy Storage and their Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 15: Non-rotating power generation and storage systems > EPE 2013 - LS6b: Converters for Energy Storage and their Control

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   A Hyrbid Photovoltaic and Battery Energy Storage System for High Power Grid-connected Applications
By Ehsan BEHROUZIAN, Konstantinos PAPASTERGIOU [View]
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Abstract: This paper presents a hybrid PV-battery grid connected system suitable for high power PV power applications. High power PV systems have impressive voltage fluctuation with regards to their maximum power point voltage. Using DC/DC converters to regulate this voltage is inefficient in high power systems as it adds an extra power conversion stage. On the other hand switching frequency, voltage stress as inverter limitations and power quality issues should be considered in high power applications. Central PV structures because of low efficiency and high cost inverters are not suitable for high power systems. Maximum power extraction from PV together with active and reactive injected power control is another challenge in high power system. Z-source multilevel inverter for PV arrays together with battery energy storage systems is a suitable solution for high power application. This paper proposes a control strategy for this hybrid system. A simulation with PSCAD has been done to validate the control strategy. Simulation results show how proposed control and topology satisfies high power requirements for PV grid connected systems.

   Design study on series compensated thyristor converters for large scale SMES
By Shinichi NOMURA, Hirotaka CHIKARAISHI, Ryuichi SHIMADA [View]
[Download]

Abstract: Superconducting magnetic energy storage (SMES) will be one of the feasible options for daily load leveling and power stabilization. Since the stored energy of SMES is proportional to the square of current, the rated current for superconducting coils will be selected to at least over 10 kA. Thyristor converters are very promising as a large current power conditioning system for high field magnets. The authors proposed the feasibility of the series compensation of thyristor converters applied to power conditioning system for superconducting coils. Using variable series capacitors, the thyristor converters can control the DC coil voltage with a resulting leading power factor. Combined with a classical thyristor converter operated with a lagging power factor, the combined converter system enables the power factor correction of the thyristor converters. The authors developed a prototype combined thyristor converter system using a gate-commuted series capacitor (GCSC), and verified the active power control capability of a superconducting coil with unity power factor. Additionally, both leading and lagging reactive power control capabilities of the combined system were also demonstrated. The authors also carried out a conceptual design of the 60-MW combined thyristor converter system applied to 360-MWh SMES for daily load leveling. From the results, the required capacity of the series compensators becomes 52 MVar to provide 60 MW of the rated output power. This capacity corresponds to 50\\% of the required capacity for the pure classical thyristor converter system with conventional shunt compensators.

   Performance comparison of phase looked loop algorithms applied to Microinverters for Distributed Photovoltaic Generation
By Rosario ATTANASIO, Francesco GENNARO, Giuseppe SCUDERI, Giacomo SCELBA, Mario CACCIATO, Giuseppe SCARCELLA [View]
[Download]

Abstract: The paper deals with the experimental comparison of different phase locked loop (PLL) algorithms for single phase, grid tied, photovoltaic generation systems; in particular, this work analyzes the effects of abnormal grid conditions on the output current and power control loops of a 250W micro-inverter unit, highlighting pros and cons of each PLL algorithm. The effectiveness of such algorithms has been evaluated by means of experimental tests analyzing the micro inverter operations when the grid voltage is affected by sags, dips, frequency variations and harmonic distortion. Harmonics rejection and dynamic response of the control algorithm in these operating conditions has been highlighted. In addition the computational burden required by each algorithm has been evaluated.

EPE 2013 - LS6b: Converters for Energy Storage and their Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 15: Non-rotating power generation and storage systems > EPE 2013 - LS6b: Converters for Energy Storage and their Control
	[return to parent folder]

	A Hyrbid Photovoltaic and Battery Energy Storage System for High Power Grid-connected Applications By Ehsan BEHROUZIAN, Konstantinos PAPASTERGIOU	[View] [Download]
Abstract: This paper presents a hybrid PV-battery grid connected system suitable for high power PV power applications. High power PV systems have impressive voltage fluctuation with regards to their maximum power point voltage. Using DC/DC converters to regulate this voltage is inefficient in high power systems as it adds an extra power conversion stage. On the other hand switching frequency, voltage stress as inverter limitations and power quality issues should be considered in high power applications. Central PV structures because of low efficiency and high cost inverters are not suitable for high power systems. Maximum power extraction from PV together with active and reactive injected power control is another challenge in high power system. Z-source multilevel inverter for PV arrays together with battery energy storage systems is a suitable solution for high power application. This paper proposes a control strategy for this hybrid system. A simulation with PSCAD has been done to validate the control strategy. Simulation results show how proposed control and topology satisfies high power requirements for PV grid connected systems.

	Design study on series compensated thyristor converters for large scale SMES By Shinichi NOMURA, Hirotaka CHIKARAISHI, Ryuichi SHIMADA	[View] [Download]
Abstract: Superconducting magnetic energy storage (SMES) will be one of the feasible options for daily load leveling and power stabilization. Since the stored energy of SMES is proportional to the square of current, the rated current for superconducting coils will be selected to at least over 10 kA. Thyristor converters are very promising as a large current power conditioning system for high field magnets. The authors proposed the feasibility of the series compensation of thyristor converters applied to power conditioning system for superconducting coils. Using variable series capacitors, the thyristor converters can control the DC coil voltage with a resulting leading power factor. Combined with a classical thyristor converter operated with a lagging power factor, the combined converter system enables the power factor correction of the thyristor converters. The authors developed a prototype combined thyristor converter system using a gate-commuted series capacitor (GCSC), and verified the active power control capability of a superconducting coil with unity power factor. Additionally, both leading and lagging reactive power control capabilities of the combined system were also demonstrated. The authors also carried out a conceptual design of the 60-MW combined thyristor converter system applied to 360-MWh SMES for daily load leveling. From the results, the required capacity of the series compensators becomes 52 MVar to provide 60 MW of the rated output power. This capacity corresponds to 50\\% of the required capacity for the pure classical thyristor converter system with conventional shunt compensators.

	Performance comparison of phase looked loop algorithms applied to Microinverters for Distributed Photovoltaic Generation By Rosario ATTANASIO, Francesco GENNARO, Giuseppe SCUDERI, Giacomo SCELBA, Mario CACCIATO, Giuseppe SCARCELLA	[View] [Download]
Abstract: The paper deals with the experimental comparison of different phase locked loop (PLL) algorithms for single phase, grid tied, photovoltaic generation systems; in particular, this work analyzes the effects of abnormal grid conditions on the output current and power control loops of a 250W micro-inverter unit, highlighting pros and cons of each PLL algorithm. The effectiveness of such algorithms has been evaluated by means of experimental tests analyzing the micro inverter operations when the grid voltage is affected by sags, dips, frequency variations and harmonic distortion. Harmonics rejection and dynamic response of the control algorithm in these operating conditions has been highlighted. In addition the computational burden required by each algorithm has been evaluated.