Economic benefit analysis of retrofitting a fixed-speed pumped storage hydropower plant with an adjustable-speed machine

Vargas-Serrano, Andres; Hamann, Andrew; Hedtke, Sören; Franck, Christian M.; Hug, Gabriela

doi:10.1109/ptc.2017.7981008

Cited by 11 publications

(9 citation statements)

References 8 publications

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“…Pump mode model under large guide vane opening: according to the full characteristic curve and the related literature under the large guide vane opening of the positive water pump area of the pump turbine [22], the characteristics of the pump turbine can be expressed by Formula (5).…”

Section: Model Of Dfimmentioning

confidence: 99%

“…It has functions such as peak load shifting, frequency modulation and accident standby [4]. Compared with traditional fixed-speed pumped storage unit, the variable-speed pumped storage unit can adjust the speed according to the change of the head under generating mode, which can improve its operating efficiency and can adjust its power under pump mode, which has a wider range of adjustment, faster adjustment speed and better adjustment effect [5,6]. Therefore, research on switching process and the dynamic response of a pumped storage power station is significant for the power grid to rationally use the functions of a pumped storage power station.…”

Section: Introductionmentioning

confidence: 99%

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Research on an Output Power Model of a Doubly-Fed Variable-Speed Pumped Storage Unit with Switching Process

Zhao

Ren

2019

Applied Sciences

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The doubly-fed variable-speed pumped storage (DFVSPS) is an effective method to balance the fluctuation of renewable energy generation and is an important means of frequency and voltage regulation of a power grid. Firstly, this paper introduces the structure and mathematical model of the DFVSPS unit. Secondly, the control methods of each switching stage in generating mode and pump mode are proposed, and the simulation study of each stage of DFVSPS switching process is carried out by MATLAB/Simulink. Thirdly, when studying the regulating effect of DFVSPS unit in the power system, due to the high switching frequency of converter in the electromagnetic transient model, the simulation speed is very slow and the data volume is large, so the model of DFVSPS unit needs to be simplified. By analyzing the dynamic behavior of the pumped storage power station, the mathematical model of output power of the DFVSPS unit is established, which includes start-up stage, load ramping stage, stable operation stage, load rejection stage and shutdown stage of generating mode and pump mode. Finally, the simplified model of DFVSPS unit is applied to a simple power system to verify its regulating effect on grid power.

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Section: Model Of Dfimmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on an Output Power Model of a Doubly-Fed Variable-Speed Pumped Storage Unit with Switching Process

Zhao

Ren

2019

Applied Sciences

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“…Superior low-voltage ride-through behavior compared to DFIM units is well-known, while no change to the machine and hydraulic circuit is necessary. Increased efficiency through operation at the optimal speed regarding hydraulic system [5], as well as higher revenue from ancillary service market participation add further value [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Modular Multilevel Converter Design and Control for Variable Speed Pumped Hydro Storage Plants

Basic¹,

Utvić

Dujić

2021

IEEE Access

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Hybrid modular multilevel converter control and design for pumped hydro storage plants is presented, addressing application-specific shortcoming of conventional back-to-back half-bridge modular multilevel converter: high common-mode-voltage machine stress. Common-mode-voltage-free operation in the entire or partial frequency range is enabled by variable DC link voltage control, through introduction of minimal full-bridge submodule share in hybrid active front-end converter stage. The developed generalized converter design approach for arbitrary DC link voltage range operation and additional internal energy balancing control layers enable down-to-zero DC voltage control. The results are verified through highfidelity switched-model simulations of 6 kV converter, with 10/6 ratio of full-bridge to half-bridge submodules in active front-end. The analyzed hybrid active front-end stage benefits from lower converter losses for equal machine operation flexibility compared to full-bridge design, while trade-off between gridside power factor range and full-bridge submodule share is offered within the design stage. Compared to the state-of-the-art, zero-to-rated DC link voltage operation is possible at lower full-bridge submodule share (62 % against 75 %), at the penalty of reduced grid-side power factor. Alternatively, operation at higher fullbridge submodule share (62 % against 50 % existing solution) enables grid-side reactive power support over wide speed range, without branch current overload.INDEX TERMS Hydroelectric power generation, modular multilevel converter, retrofit.

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“…selection of optimal operating speed [3], and increased revenue from participating at ancillary services market [4], are clear motivations for retrofit of existing PHSP units to VS. Historically, components-and topologies-related limitations in available power electronics converters restricted large VS units to the use of Doubly-Fed Induction Machine (DFIM) ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Highly Flexible Indirect Modular Multilevel Converter for High Power Pumped Hydro Storage Plants

Basic

Schwery

Dujić

2020

IECON 2020 the 46th Annual Conference of the IEEE Industrial Electronics Society

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As fossil-fuel-and nuclear-based generating facilities are being phased-out in favor of intermittent renewable energy sources, the need for large scale, highly flexible balancing storage is imminent. By the generating capacity of readily available units, enormous potential lays in retrofitting of large pumped hydro storage plants to variable speed operation, increasing their flexibility to meet future power system demands. Indirect Modular Multilevel Converter is a highly scalable and inherently redundant topology that meets the power and voltage ratings of large pumped hydro generating units. Variable DC link converter operation, offering common-mode-free machine-side operation has been evaluated, considering constraints in retrofit of old machines, not designed for converter-fed operation. Performance evaluation over the entire operating range of the plant is performed. Grid support dynamics has been assessed. Finally, application-specific challenges in the design stage are pointed out.

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Economic benefit analysis of retrofitting a fixed-speed pumped storage hydropower plant with an adjustable-speed machine

Cited by 11 publications

References 8 publications

Research on an Output Power Model of a Doubly-Fed Variable-Speed Pumped Storage Unit with Switching Process

Research on an Output Power Model of a Doubly-Fed Variable-Speed Pumped Storage Unit with Switching Process

Hybrid Modular Multilevel Converter Design and Control for Variable Speed Pumped Hydro Storage Plants

Highly Flexible Indirect Modular Multilevel Converter for High Power Pumped Hydro Storage Plants

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