EPE Association: EPE 2020 - LS5b: Grid Stability and Energy Harvesting

EPE 2020 - LS5b: Grid Stability and Energy Harvesting
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 05: Renewable Energy Power Systems > EPE 2020 - LS5b: Grid Stability and Energy Harvesting

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   Design and Control of a Modular Power Electronic Back-to-Back Converter for Wave Energy Harvesting Applications
By MATTIA MANTELLINI [View]
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Abstract: Waves are one of the most promising renewable energy sources. Several concepts of wave energyconverters (WECs) have been studied, but only few of them have progressed to sea testing. The EU,under the Horizon 2020 framework, is financing the development of an innovative WEC based on adirect-drive power take-off, with a modular back-to-back power electronic converter and an azimuthalmulti-translator switched reluctance machine. The paper aims to illustrate its structure and control.

   Evaluating frequency stability with consideration of load type in different share of renewables and emulated inertia in case of system split
By Nastaran FAZLI [View]
[Download]

Abstract: Nowadays, with increasing the share of renewable generation units, a modern power system encoun-ters stability challenges due to the shrunken inertia. Yet the majority of installed wind turbines as an alternative for synchronous generator do not perform a similar role regarding inertia provision and grid support, which sets a limit for higher penetration of them into a power system. As a solution, new control for converter-based generation units is introduced, enabling them to be a grid supporting voltage control system, which reacts seamlessly to the variation of the grid parameters. Hence, this paper aims to evaluate the required minimum amount of inertia to keep stability after a system split. To this aim, a comparison will be drawn between the synchronous generator and these grid-supporting voltage control power sources in combination with the installed capacity of grid feeding wind turbines. Besides, the tests will be done in the presence of different type of loads, as the effect of converter-fed loads is worth investigating in the evaluation of the border for the share of renewables.

   Lifetime Estimation and Dimensioning of Machine-Side Converter for Pumping-Cycle Airborne Wind Energy System
By BAKR BAGABER [View]
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Abstract: Fostering of High Altitude Wind Energy (HAWE) resources above 200 meters is a recent promisingtechnology that seeks to capture the strong wind currents at high elevations. Among the many concepts of Airborne Wind Energy (AWE) generators, the Soft-Kite Pumping-Cycle (PC) concept promises to provide a very lightweight, high power density, and cost-effective solution. In this study, the impact of the load-cycle on the lifetime of the machine-side converter (MSC) is examined. By employing a physics-of-failure estimation approach, the main pumping-cycles and the machine speed-reversal were identified as the primary adverse influencers of the IGBT and Diode solder joints. Whereas, wind speeds around 12 m/s contribute the most to the predicted degradation. To fulfill the thermal limitations and the lifetime requirements of the application, an optimum converter dimension is found using linear scaling of the semiconductors chip-area and the heatsink thermal impedances. With the generation (reel-out) phase power defined as the base value, the results suggest that the converter needs to be scaled by at least 150\% to meet the thermal constraints, and by 350\% to approach the target lifetime of ten years.

   Stability Investigation of Large-Scale PV Parks with Eigenvalue-Based Method
By Zhiqing YANG [View]
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Abstract: This paper introduces a state-space model (SSM) based framework to analyze the small-signal stability of large-scale photovoltaic (PV) parks. An improved SSM of PV inverters is proposed considering an accurate impact of the grid synchronization. Different methods are implemented to investigate the system stability, including eigenvalue distribution, participation factor and a proposed damping-resonance analysis. Based on that, the reason of an unstable resonance can be identified and the operation and control design can be optimized following a systematic approach.

EPE 2020 - LS5b: Grid Stability and Energy Harvesting
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 05: Renewable Energy Power Systems > EPE 2020 - LS5b: Grid Stability and Energy Harvesting
	[return to parent folder]

	Design and Control of a Modular Power Electronic Back-to-Back Converter for Wave Energy Harvesting Applications By MATTIA MANTELLINI	[View] [Download]
Abstract: Waves are one of the most promising renewable energy sources. Several concepts of wave energyconverters (WECs) have been studied, but only few of them have progressed to sea testing. The EU,under the Horizon 2020 framework, is financing the development of an innovative WEC based on adirect-drive power take-off, with a modular back-to-back power electronic converter and an azimuthalmulti-translator switched reluctance machine. The paper aims to illustrate its structure and control.

	Evaluating frequency stability with consideration of load type in different share of renewables and emulated inertia in case of system split By Nastaran FAZLI	[View] [Download]
Abstract: Nowadays, with increasing the share of renewable generation units, a modern power system encoun-ters stability challenges due to the shrunken inertia. Yet the majority of installed wind turbines as an alternative for synchronous generator do not perform a similar role regarding inertia provision and grid support, which sets a limit for higher penetration of them into a power system. As a solution, new control for converter-based generation units is introduced, enabling them to be a grid supporting voltage control system, which reacts seamlessly to the variation of the grid parameters. Hence, this paper aims to evaluate the required minimum amount of inertia to keep stability after a system split. To this aim, a comparison will be drawn between the synchronous generator and these grid-supporting voltage control power sources in combination with the installed capacity of grid feeding wind turbines. Besides, the tests will be done in the presence of different type of loads, as the effect of converter-fed loads is worth investigating in the evaluation of the border for the share of renewables.

	Lifetime Estimation and Dimensioning of Machine-Side Converter for Pumping-Cycle Airborne Wind Energy System By BAKR BAGABER	[View] [Download]
Abstract: Fostering of High Altitude Wind Energy (HAWE) resources above 200 meters is a recent promisingtechnology that seeks to capture the strong wind currents at high elevations. Among the many concepts of Airborne Wind Energy (AWE) generators, the Soft-Kite Pumping-Cycle (PC) concept promises to provide a very lightweight, high power density, and cost-effective solution. In this study, the impact of the load-cycle on the lifetime of the machine-side converter (MSC) is examined. By employing a physics-of-failure estimation approach, the main pumping-cycles and the machine speed-reversal were identified as the primary adverse influencers of the IGBT and Diode solder joints. Whereas, wind speeds around 12 m/s contribute the most to the predicted degradation. To fulfill the thermal limitations and the lifetime requirements of the application, an optimum converter dimension is found using linear scaling of the semiconductors chip-area and the heatsink thermal impedances. With the generation (reel-out) phase power defined as the base value, the results suggest that the converter needs to be scaled by at least 150\% to meet the thermal constraints, and by 350\% to approach the target lifetime of ten years.

	Stability Investigation of Large-Scale PV Parks with Eigenvalue-Based Method By Zhiqing YANG	[View] [Download]
Abstract: This paper introduces a state-space model (SSM) based framework to analyze the small-signal stability of large-scale photovoltaic (PV) parks. An improved SSM of PV inverters is proposed considering an accurate impact of the grid synchronization. Different methods are implemented to investigate the system stability, including eigenvalue distribution, participation factor and a proposed damping-resonance analysis. Based on that, the reason of an unstable resonance can be identified and the operation and control design can be optimized following a systematic approach.