Techno-economic assessment of providing control energy reserves with a biogas plant

doi:10.1007/s11705-018-1776-x

Front. Chem. Sci. Eng.

2018, Vol. 12

Issue (4) : 763-771 https://doi.org/10.1007/s11705-018-1776-x

RESEARCH ARTICLE

Techno-economic assessment of providing control energy reserves with a biogas plant

Ervin Saracevic¹(

), David Woess², Franz Theuretzbacher³, Anton Friedl¹, Angela Miltner¹

¹. Institute of Chemical, Environmental and Bioscience Engineering, TU Wien, 1060 Vienna, Austria
². University of Natural Resources and Life Sciences, 1180 Vienna, Austria
³. University of Applied Sciences, 2700 Wiener Neustadt, Austria

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Abstract

Grid stability is being challenged by the increasing integration of power plants with volatile power generation into the energy system. Power supply fluctuations must be compensated by energy system flexibility. The storability of the energy carrier enables biogas plants to generate power flexibly. In this study, the technical and economic effects of providing positive secondary control energy reserves with an Austrian biogas plant were assessed. The plant’s main focus lies in biomethane production with the option of heat and power generation through combined heat and power (CHP) units. A detailed simulation model of the investigated biogas plant was developed, which is presented in this work. Ex-post simulations of one year of flexible plant operation were conducted with this model. The findings show that the installed biogas storage capacity is sufficient to provide control energy reserves while simultaneously producing biomethane. Profitability of providing control energy reserves largely depends on the prices at the control energy market and on CHP unit start-up costs. A cost efficiency analysis demonstrated that investing in a hot water tank with a volume of 5 m³ for short-term heat storage turned out to be economically viable.

Keywords biogas plant process simulation control energy reserves economic assessment gas storage

Corresponding Author(s): Ervin Saracevic

Online First Date: 20 December 2018 Issue Date: 03 January 2019

Cite this article:

Ervin Saracevic,David Woess,Franz Theuretzbacher, et al. Techno-economic assessment of providing control energy reserves with a biogas plant[J]. Front. Chem. Sci. Eng., 2018, 12(4): 763-771.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1776-x
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I4/763

Fig.1 Current state of operation at the biogas plant (biomethane production) and investigated state of operation (biomethane production and provision of control energy reserves)

Fig.2 Simulation model of the investigated biogas plant in IPSEpro?7.0

Fig.3 CHP unit model validation by comparison of measured data to simulated data

Parameter	Value	Unit	Source
Costs and revenues of biogas plant			Information by plant operator
Energy price for control energy reserve	200	€?MW·h^-1
Electricity cost of biogas plant	60	€?MW·h^-1
Heat cost of biogas plant	55	€?MW·h^-1
Biomethane revenue	55	€? $m N − 3$
CHP unit start-up cost	10	€
CHP unit maintenance cost	16.5	€?h^-1
Power grid utilisation cost	1.76	€?MW·h^-1
Cost efficiency analysis for heat storage
Investment costs for hot water tank	18.18*V^a)^0.63	€	[²⁹]
Cost Index	1.39	?	[³⁰]
Amortisation period	15	Y
Maintenance cost (in % of investment)	2	%	[²⁸]
Insurance cost (in % of investment)	0.5	%	[²⁸]

Tab.1 Parameters of the economic assessment

Fig.4 Additional revenues of providing positive secondary control energy reserves and costs and revenues of power generation with the CHP units

Fig.5 Simulated gas storage level for January 2017

Fig.6 Results of cost efficiency analysis in regards to hot water tank volume

Fig.7 Relative change to the additional revenue through the provision of control energy reserves after a?10%?parameter variation of costs and revenues for power generation with CHP units in January 2017

Fig.8 Development of power price at the market for positive secondary control energy reserves during the simulated period

Fig.9 Results of a sensitivity analysis on heat and investment costs for a hot water tank with a volume of 5?m³

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