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Keywords = adjustable-speed pumped-storage hydropower

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13 pages, 8893 KB  
Article
Hydropower and Pumped Storage Hydropower Resource Review and Assessment for Alaska’s Railbelt Transmission System
by Leif Bredeson and Phylicia Cicilio
Energies 2023, 16(14), 5494; https://doi.org/10.3390/en16145494 - 20 Jul 2023
Cited by 5 | Viewed by 4393
Abstract
The Alaska Railbelt transmission system runs from Fairbanks to Anchorage to Homer and supplies 75% of the state’s population with power. In the near future, this system will experience significant increases in load due to electrification of the transportation and heating sectors. To [...] Read more.
The Alaska Railbelt transmission system runs from Fairbanks to Anchorage to Homer and supplies 75% of the state’s population with power. In the near future, this system will experience significant increases in load due to electrification of the transportation and heating sectors. To account for this, several state organizations are working towards the creation of an integrated resource plan and reliability standards.This work encompasses the efforts of researching the operations, cost, and locations of desirable hydropower and pumped storage hydropower (PSH) resources in the areas surrounding the Railbelt transmission system. The aspects of conventional hydropower and PSH as well as adjustable-speed and ternary PSH were analyzed. With Alaska’s diverse and rugged landscape, QGIS was utilized to delineate the positions of energy resources within a reasonable distance from the Railbelt. By incorporating Digital Terrain Models and the QGIS processing toolbox, a least cost path analysis was completed to filter out resources within the designated distance of the Railbelt. Applying existing cost models to the data in this work helped to decide the energy resources that would be studied further. The future of this project includes modeling the selected energy sources in the PSS/e Railbelt model to examine their effects on the reliability and stability. Full article
(This article belongs to the Topic Hydroelectric Power)
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23 pages, 5745 KB  
Article
Reserve-Constrained Unit Commitment Considering Adjustable-Speed Pumped-Storage Hydropower and Its Economic Effect in Korean Power System
by Woo-Jung Kim, Yu-Seok Lee, Yeong-Han Chun and Hae-Seong Jeong
Energies 2022, 15(7), 2386; https://doi.org/10.3390/en15072386 - 24 Mar 2022
Cited by 13 | Viewed by 4593
Abstract
The Korean government has declared the goal of net-zero-carbon emissions with a focus on renewable energy expansion. However, a high proportion of baseload generators and an increasing proportion of variable renewable energy (VRE) may cause problems in the power system operation owing to [...] Read more.
The Korean government has declared the goal of net-zero-carbon emissions with a focus on renewable energy expansion. However, a high proportion of baseload generators and an increasing proportion of variable renewable energy (VRE) may cause problems in the power system operation owing to the low cycling capability of baseload generators and variability of VRE. To maintain system reliability, the government is planning to construct pumped-storage hydropower (PSH) plants, which can provide flexibility to the system. This study evaluated the operating cost savings obtained by different types of PSH: the adjustable-speed PSH (AS-PSH) and fixed-speed PSH (FS-PSH), based on the duck-curve phenomenon and the increase in spinning reserve requirement. In this study, the reserve-constrained unit commitment was formulated using a mixed-integer-programming considering the operational characteristics of AS-PSH and conventional generators. To consider the duck-shaped net-load environment, the projected VRE output data were calculated through physical models of wind turbines and photovoltaic modules. The operating costs for the non-PSH, FS-PSH, and AS-PSH construction scenarios were KRW 43,129.38, 40,038.44, and 34,030.46, respectively. The main factor that derived this difference was determined to be the primary reserve of AS-PSH’s pumping mode. Full article
(This article belongs to the Topic Optimisation, Optimal Control and Nonlinear Dynamics in Electrical Power, Energy Storage and Renewable Energy Systems)
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15 pages, 2413 KB  
Article
Network and Reserve Constrained Economic Analysis of Conventional, Adjustable-Speed and Ternary Pumped-Storage Hydropower
by Soumyadeep Nag and Kwang Y. Lee
Energies 2020, 13(16), 4140; https://doi.org/10.3390/en13164140 - 11 Aug 2020
Cited by 9 | Viewed by 2510
Abstract
With increasing renewable penetration and projected increase in natural disasters, the reliability and resiliency of a power system become crucial issues. As network inertia drops with increasing penetration of renewables, operators search for flexible resources that can help cope with a disruptive event [...] Read more.
With increasing renewable penetration and projected increase in natural disasters, the reliability and resiliency of a power system become crucial issues. As network inertia drops with increasing penetration of renewables, operators search for flexible resources that can help cope with a disruptive event or manage renewable intermittency. Energy storage is a solution, but the type of storage solution needs to be profitable to exist in the current and upcoming power markets. Advanced pumped-storage hydropower (PSH) is one solution that can help cope with such requirements, which will in turn help to increase the renewable penetration in the system. This paper qualitatively compares the revenue earning potential of PSH configurations, including, adjustable-speed PSH (AS-PSH) and ternary PSH (T-PSH) in comparison to conventional PSH (C-PSH) from the arbitrage and regulation markets, with and without the presence of wind penetration. In addition, a framework for quantitative analysis of any energy storage system has been proposed. A 24-bus RTS system is studied with summer and winter variations in load and wind power. Through revenue and operational mode analysis, this paper reveals that T-PSH has the highest revenue earning potential, which is mainly due to its ability to operate with a hydraulic short circuit. Full article
(This article belongs to the Section D: Energy Storage and Application)
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25 pages, 9074 KB  
Article
Frequency Regulation of a Hybrid Wind–Hydro Power Plant in an Isolated Power System
by Guillermo Martínez-Lucas, José Ignacio Sarasúa and José Ángel Sánchez-Fernández
Energies 2018, 11(1), 239; https://doi.org/10.3390/en11010239 - 19 Jan 2018
Cited by 57 | Viewed by 9549
Abstract
Currently, some small islands with high wind potential are trying to reduce the environmental and economic impact of fossil fuels by using renewable resources. Nevertheless, the characteristics of these renewable resources negatively affect the quality of the electrical energy, causing frequency disturbances, especially [...] Read more.
Currently, some small islands with high wind potential are trying to reduce the environmental and economic impact of fossil fuels by using renewable resources. Nevertheless, the characteristics of these renewable resources negatively affect the quality of the electrical energy, causing frequency disturbances, especially in isolated systems. In this study, the combined contribution to frequency regulation of variable speed wind turbines (VSWT) and a pump storage hydropower plant (PSHP) is analyzed. Different control strategies, using the kinetic energy stored in the VSWT, are studied: inertial, proportional, and their combination. In general, the gains of the VSWT controller for interconnected systems proposed in the literature are not adequate for isolated systems. Therefore, a methodology to adjust the controllers, based on exhaustive searches, is proposed for each of the control strategies. The control strategies and methodology have been applied to a hybrid wind–hydro power plant on El Hierro Island in the Canary archipelago. At present, in this isolated power system, frequency regulation is only provided by the PSHP and diesel generators. The improvements in the quality of frequency regulation, including the VSWT contribution, have been proven based on simulating different events related to wind speed, or variations in the power demand. Full article
(This article belongs to the Special Issue Wind Generators Modelling and Control)
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13 pages, 4736 KB  
Article
Frequency-Adaptive Modified Comb-Filter-Based Phase-Locked Loop for a Doubly-Fed Adjustable-Speed Pumped-Storage Hydropower Plant under Distorted Grid Conditions
by Wei Luo, Jianguo Jiang and He Liu
Energies 2017, 10(6), 737; https://doi.org/10.3390/en10060737 - 23 May 2017
Cited by 7 | Viewed by 5562
Abstract
The control system of a doubly-fed adjustable-speed pumped-storage hydropower plant needs phase-locked loops (PLLs) to obtain the phase angle of grid voltage. The main drawback of a comb-filter-based phase-locked loop (CF-PLL) is the slow dynamic response. This paper presents a modified comb-filter-based phase-locked [...] Read more.
The control system of a doubly-fed adjustable-speed pumped-storage hydropower plant needs phase-locked loops (PLLs) to obtain the phase angle of grid voltage. The main drawback of a comb-filter-based phase-locked loop (CF-PLL) is the slow dynamic response. This paper presents a modified comb-filter-based phase-locked loop (MCF-PLL) by improving the pole-zero pattern of the comb filter, and gives the parameters’ setting method of the controller, based on the discrete model of MCF-PLL. In order to improve the disturbance resistibility of MCF-PLL when the power grid’s frequency changes, this paper proposes a frequency-adaptive modified, comb-filter-based, phase-locked loop (FAMCF-PLL) and its digital implementation scheme. Experimental results show that FAMCF-PLL has good steady-state and dynamic performance under distorted grid conditions. Furthermore, FAMCF-PLL can determine the phase angle of the grid voltage, which is locked when it is applied to a doubly-fed adjustable-speed pumped-storage hydropower experimental platform. Full article
(This article belongs to the Special Issue Hydropower 2017)
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