Pumped-storage units to address spinning reserve concerns in the grids with high wind penetration

Rahmati, Iman; Foroud, Asghar Akbari

doi:10.1016/j.est.2020.101612

Cited by 17 publications

(8 citation statements)

References 29 publications

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“…In this study, the parameters of the pumped storage power station in [ 36 ], hourly electrical, heating, and cooling loads data in [ 37 ], the fluctuation in the demand for desalinated water in a 24-hour period [ 18 ], and the time-varying curve of wind energy, solar energy in [ 38 ] are referred for model construction and algorithm solution. Among them, pumped storage unit related data are presented in S1 Table , while the reservoir data of the pumped storage power station are shown in S2 Table and Fig 4A is the forecast curves of the heat and cooling load, electrical load, and cooling load; Fig 4B is the forecast curves of the demand for desalinated water; Fig 4C presents the forecasts for wind and photovoltaic power generation.…”

Section: Analysis Of Examplesmentioning

confidence: 99%

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Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

et al. 2022

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The integrated energy system (IES) optimal scheduling under the comprehensive flexible operation mode of pumping storage is considered. This system is conducive to the promotion of the accommodation of wind and solar energy and can meet the water, electricity and heat needs of coastal areas far away from the energy center. In this study, the joint dispatch between double pumped storage power stations is used to accommodate wind and solar energy better and smooth their fluctuations on the grid. Through the scheduling of water between the high and low reservoirs of double pumped storage power stations and the reservoir of the seawater desalination plant, the impact of storage capacity constraints on pumped storage power plants is reduced. Moreover, the objective function to build the IES optimization scheduling model is to achieve minimum economic cost. The results reveal that the integrated energy system accommodates all wind energy and solar energy. As such, the system increases the average working time of the pumped storage unit by 1.9 hours and reduces the economic cost by 31.50%. Based on the simulation results, the model can enhance the accommodation capability of wind energy and solar energy and improve the system economy.

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Section: Analysis Of Examplesmentioning

confidence: 99%

“…Refer to micro-source equipment parameters and energy prices in [ 24 , 36 , 39 – 44 ] to make the following settings. The maximum output power and minimum output power of the gas turbine are 114 MW and 28.5 MW, respectively.…”

Section: Analysis Of Examplesmentioning

confidence: 99%

Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

et al. 2022

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“…Here, the mathematical model of a pressure penstock is represented by an expression for a rigid water hammer. The characteristics of penstock systems can be expressed as Equation (5).…”

Section: Hydro-turbine and Penstock Systemmentioning

confidence: 99%

“…The discontinuity of renewable energy and the inconsistency between power generation supply limits the large-scale integration of energy systems, especially in autonomous systems where renewable energy is the main source [1][2][3]. Usually, these composite renewable systems employ rechargeable storage devices to balance the inconsistency of power generation and supply, therefore, pumped storage plants are widely applied for this purpose [4][5][6]. As a giant natural battery, pumped hydro storage is the most effective technology in the energy storage system [7,8].…”

Section: Introductionmentioning

confidence: 99%

Regulation Characteristics and Load Optimization of Pump-Turbine in Variable-Speed Operation

Wang

2021

Energies

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In order to improve the operating and regulation characteristics of the hydropower unit and to stabilize the load fluctuations, variable-speed pumped storage technology based on converters has been proposed and given more attention recently. However, different from the conventional units, due to the variability of operation conditions, variable-speed units need to develop a load optimization strategy in terms of operating parameter identification to ensure state matching for operation. Therefore, this paper proposes an optimization search step based on the model test curve, and the process of parameter optimization search is elaborated and calculated in the turbine operating condition and pump operating condition, respectively. A mathematical model of the turbine regulation system is established to analyze the influence of speed and guide vane related parameters on the regulation characteristics, and the achievable operating range and regulation capacity in the variable-speed condition is pointed out based on pump-turbine model test, as well as the advantages over the fixed-speed operation. The results show that by applying the load optimization method, the variable-speed unit can be significantly improved in terms of operating efficiency, especially at low head and low power conditions. Meanwhile, a certain range of active power regulation can be realized by the decoupling control of the converter and measuring the guide vane opening in both modes. The analysis of the model test verifies the effectiveness of the variable-speed regulation operation of pump-turbine and provides a reference for the design and operation of the variable-speed hydropower units.

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“…Linearization of these formulas transforms the problem into a mixed‐integer linear program (MILP) and facilitates using the more promising solvers. The linearization process includes adding extra parameters, variables, and formulations, and the method we used here is as what is expressed in Reference 32. Equation (7) includes the product of a binary variable (

{State}_{g, t}

) and a non‐negative real variable (

P_{g, t}

) that can be linearized using extra Equations (E1) to (E4), in which r is the real variable, b the binary variable, R an upper‐bound parameter for r , and z is the product of the two variables.

z \leq r,

z \geq 0,

z \leq b \times R,

z \geq r - ((), 1 - b) \times R .

…”

Section: Problem Formulationmentioning

confidence: 99%

Investigation of power‐based day‐ahead electricity market in terms of inducing fake ramp demand, assuring real‐time compatibility, support for flexibility, and providing some solutions

Rahmati

Foroud

2021

Int Trans Electr Energ Syst

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The conventional design of electricity markets is based on energy (energy‐based model or EbM). EbM includes some formerly assumed minor flaws that lead to a mismatch between the day‐ahead schedules and real‐time operation. Since these flaws are within the EbM's nature, even without any kind of forecast error, the EbM generation schedule may be unrealizable in real‐time operation. An alternative design based on power (power‐based model or PbM) has been introduced in the previous studies for better real‐time compatibility. Some uninvestigated aspects of this new model are addressed in this paper to shed more light on its pros and cons: (a) Formation of fake demand for extra ramp is likely in PbM. This phenomenon, which is overlooked in previous studies, can endanger system integrity and market performance. This weakness is explained here, and a solution is proposed. (b) Increasing time granularity is known effective for reflecting real‐time condition in the day‐ahead market. We doubled the time resolution of EbM and compared its schedules with PbM's schedules from the viewpoint of real‐time compatibility. (c) Flexibility is a serious issue in the power system. As a new design for market, knowing PbM's impact on this matter is crucial, which is missing in the literature. To fill the gap, PbM's impact on the economic position of flexible units is analyzed here. This paper has a practical perspective, and the input data of the test system are based on the Iranian power grid. The input parameters are scaled down to fit the IEEE 24‐Bus test system.

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Pumped-storage units to address spinning reserve concerns in the grids with high wind penetration

Cited by 17 publications

References 29 publications

Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

Integrated energy system optimal scheduling considering the comprehensive and flexible operation mode of pumping storage

Regulation Characteristics and Load Optimization of Pump-Turbine in Variable-Speed Operation

Investigation of power‐based day‐ahead electricity market in terms of inducing fake ramp demand, assuring real‐time compatibility, support for flexibility, and providing some solutions

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