Simulation of Cogeneration-Combined Cycle Plant Flexibilization by Thermochemical Energy Storage

Angerer, M.; Djukow, Michael; Riedl, K.; Gleis, S.; Spliethoff, Hartmut

doi:10.1115/1.4038666

Cited by 35 publications

(14 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, a bi-product of that is a reduction in the profit margin of co-generation units, and hence an increase in the necessity of flexible operations to avoid injection of power to the grid when spot prices drop below marginal costs [10]. Fig.…”

Section: Epex Day-ahead Marketmentioning

confidence: 99%

The evolution of electricity price on the German day-ahead market before and after the energy switch

2019

View full text Add to dashboard Cite

a b s t r a c tGermany is a forerunner in developing renewable energies. It is therefore of considerable interest to investigate the impact of switch to renewables on the market during transition era. The aim of this study is in two parts: 1) Investigating the volatility; and 2) Conducting a descriptive study on the evolution of daily profiles and emergence of non-positive prices. In terms of volatility quantification, the following characteristics of EPEX prices should be recognized: 1) Covering the whole year (24/7); 2) Taking nonpositive values; 3) Depending on calendar information; and 4) Changing according to demand and supply availability. We, therefore, propose a robust and generic approach to account for diurnal or seasonal patterns of human activities in volatility analysis. An important distinction of our work is in introducing an alternative representation (as matrices) for quasi-periodic price data. We, herein, propose a new notion of volatility using a matrix decomposition technique, namely the singular value decomposition (SVD). Our observations indicate price volatility reduction, in the recent years. The second part of this article provides evidences of effect of renewables on daily price profiles e emergence of nonpositive prices and also shifts of peak price values to hours where solar is less available.

show abstract

Section: Epex Day-ahead Marketmentioning

confidence: 99%

The evolution of electricity price on the German day-ahead market before and after the energy switch

2019

View full text Add to dashboard Cite

show abstract

“…There are authors using the term "unit commitment" in a narrow sense, where it refers to the on/off status of generators and then economic dispatch is performed to specify the generation level of the units [e.g. [6][7][8][9]. In a broad sense, as it is used in this paper, UC refers to determining both the on/off status and the generation level.…”

Section: Literature Reviewmentioning

confidence: 99%

“…In many cases they were applied to combined cycle power plants [e.g. 5,8,10,12,14,15]. Models proposed to simulate thermal unit operations differ considerably in the degree of detail.…”

Section: Literature Reviewmentioning

confidence: 99%

Evaluati on of long-term start up costs impact on short-term price based operational optimization of a CCGT using MILP

2019

View full text Add to dashboard Cite

An increasing share of the weather-dependent RES generation in the power system leads to the growing importance of flexibility of conventional power plants. They were usually designed for base load operation and it is a challenge to determine the actual long-term cycling costs, which account for an increase in maintenance and overhaul expenditures, increased forced outage rates and shortened life expectancy of the plant and components. In this paper, the overall impact of start up costs is evaluated by formulating and solving price based unit commitment problem (PBUC). The electricity spot market is considered as a measure for remunerating flexibility. This approach is applied to a real-life case study based on the 70 MWe PGE Gorzόw CCGT power plant. Different operation modes are calculated and results are used to derive a mixed integer linear programming (MILP) model to optimize the operation of the plant. The developed mathematical model is implemented in Python within the frame of the PuLP library and solved using GUROBI. Results of the application of the method to a numerical example are presented.

show abstract

“…Within those, the group of hydroxides is environmentally friendly [8], cheap [9], and covers a wide range of reaction temperatures. Several applications are envisaged, such as domestic heating [10], enhancement of CHP plants [11] or concentrated solar-power plants [12]. So far, however, no technology is commercially available.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Heat Storage in a Lab-Scale Indirectly Operated CaO/Ca(OH)2 Reactor—Numerical Modeling and Model Validation through Inverse Parameter Estimation

2021

View full text Add to dashboard Cite

Calcium oxide/Calcium hydroxide can be utilized as a reaction system for thermochemical heat storage. It features a high storage capacity, is cheap, and does not involve major environmental concerns. Operationally, different fixed-bed reactor concepts can be distinguished; direct reactor are characterized by gas flow through the reactive bulk material, while in indirect reactors, the heat-carrying gas flow is separated from the bulk material. This study puts a focus on the indirectly operated fixed-bed reactor setup. The fluxes of the reaction fluid and the heat-carrying flow are decoupled in order to overcome limitations due to heat conduction in the reactive bulk material. The fixed bed represents a porous medium where Darcy-type flow conditions can be assumed. Here, a numerical model for such a reactor concept is presented, which has been implemented in the software DuMux. An attempt to calibrate and validate it with experimental results from the literature is discussed in detail. This allows for the identification of a deficient insulation of the experimental setup. Accordingly, heat-loss mechanisms are included in the model. However, it can be shown that heat losses alone are not sufficient to explain the experimental results. It is evident that another effect plays a role here. Using Bayesian inference, this effect is identified as the reaction rate decreasing with progressing conversion of reactive material. The calibrated model reveals that more heat is lost over the reactor surface than transported in the heat transfer channel, which causes a considerable speed-up of the discharge reaction. An observed deceleration of the reaction rate at progressed conversion is attributed to the presence of agglomerates of the bulk material in the fixed bed. This retardation is represented phenomenologically by mofifying the reaction kinetics. After the calibration, the model is validated with a second set of experimental results. To speed up the calculations for the calibration, the numerical model is replaced by a surrogate model based on Polynomial Chaos Expansion and Principal Component Analysis.

show abstract

Simulation of Cogeneration-Combined Cycle Plant Flexibilization by Thermochemical Energy Storage

Cited by 35 publications

References 33 publications

The evolution of electricity price on the German day-ahead market before and after the energy switch

The evolution of electricity price on the German day-ahead market before and after the energy switch

Evaluati on of long-term start up costs impact on short-term price based operational optimization of a CCGT using MILP

Thermochemical Heat Storage in a Lab-Scale Indirectly Operated CaO/Ca(OH)2 Reactor—Numerical Modeling and Model Validation through Inverse Parameter Estimation

Contact Info

Product

Resources

About