Utilization of District Heating Networks to Provide Flexibility in CHP Production

Korpela, Timo; Kaivosoja, Jyri; Majanne, Yrjö; Laakkonen, Leo; Nurmoranta, Maria; Vilkko, Matti

doi:10.1016/j.egypro.2017.05.077

Cited by 51 publications

(18 citation statements)

References 11 publications

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“…Advantages of centralized thermal storage in terms of operational flexibility of CHP (combined heat and Power) for district heating is well-explored in [7]. The flexibility of a district heating network for automatic frequency restoration reserve market is studied in [8]. The balancing markets provide an opportunity for introducing more EBs into DH and increase its contribution to flexibility [9].…”

Section: Introductionmentioning

confidence: 99%

Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

et al. 2019

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Active use of heat accumulators in the thermal system has the potential for achieving flexibility in district heating with the power to heat (P2H) units, such as electric boilers (EB) and heat pumps. Thermal storage tanks can decouple demand and generation, enhancing accommodation of sustainable energy sources such as solar and wind. The overview of flexibility, using EB and storage, supported by investigating the nature of thermal demand in a Danish residential area, is presented in this paper. Based on the analysis, curve-fitting tools, such as neural net and similar day method, are trained to estimate the residential thermal demand. Utilizing the estimated demand and hourly market spot price of electricity, the operation of the EB is scheduled for storing and fulfilling demand and minimizing energy cost simultaneously. This demonstrates flexibility and controlling the EB integrated into a multi-energy system framework. Results show that the curve fitting tool is effectively suitable to acknowledge thermal demands of residential area based on the environmental factor as well as user behaviour. The thermal storage has the capability of operating as a flexible load to support P2H system as well as minimize the effect of estimation error in fulfilling actual thermal demand simultaneously.

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Section: Introductionmentioning

confidence: 99%

Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

et al. 2019

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“…As another subsystem in CHP plants, district heating (DH) network is also expected to enhance the flexibility of CHP plants because of the potential of energy storage. For the hour‐level application, the DH network focuses on load‐range extending, while the minute‐level application is to accelerate the load variation process (named “DH scheme” hereafter) . For the minute‐level application, when the generated power is expected to decrease, the mass flow of heat supply steam extraction (HSSE) can be increased in an appropriate range, which will reduce the output of the electric power in a short time while the supplied more thermal energy is stored in the DH network and vice versa.…”

Section: Introductionmentioning

confidence: 99%

“…For the hour-level application, the DH network focuses on load-range extending, 29 while the minute-level application is to accelerate the load variation process (named "DH scheme" hereafter). 30,31 For the minute-level application, when the generated power is expected to decrease, the mass flow of heat supply steam extraction (HSSE) can be increased in an appropriate range, which will reduce the output of the electric power in a short time while the supplied more thermal energy is stored in the DH network and vice versa. Compared with the additional hot water tank scheme, the system complexity and the investment requirement are lower.…”

mentioning

confidence: 99%

A comprehensive thermodynamic analysis of load‐flexible CHP plants using district heating network

Sun

Cheng

et al. 2019

Int J Energy Res

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Summary Because of the rapid expansion of intermittent renewable energy, conventional coal‐fired power plants, including combined heat and power (CHP) plants, are required to improve the quick‐response ability to respond the changing demand of the grid. However, the flexibility of CHP plants is not easy to be improved because of the restriction of traditional load variation mechanism. This work presents a comprehensive thermodynamic analysis on the flexibility‐improving scheme using the thermal energy storage (TES) capacity of district heating (DH) network. A typical CHP plant and related DH network were selected as a case study. The flexibility demand under the context of renewables accommodation in the short timescale (counted by minutes) and the operational characteristics of CHP plants were analyzed on the basis of experimental data and thermodynamics. Besides, the influence of heat supply adjustment on heat users' indoor temperature was quantified with a dynamic model, and the thermal inertia of the DH network is discussed. Moreover, a thermodynamic model for the load variation processes simplified with operational characteristics was established to analyze the response ability improvement of CHP plants. Results of the case study show, the scheme can shorten approximately 34% of the response time while almost have no influence on the indoor temperature of heat users.

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“…In order to tackle these problems, different analysis have been proposed in the literature. Methods for monitoring DH substations are proposed in [29,30], test for the exploitation of the building capacity to perform demand side management are carried out in [31,32], analysis for the exploitation of network thermal capacity [33].…”

Section: Introductionmentioning

confidence: 99%

Towards 4th Generation District Heating by Demand Side Management: A Real Application

Guelpa¹,

Verda²

2019

IJES

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District heating (DH) is an increasingly exploited technology because of the possibility of integrating various high performance technologies fed by different source (including renewable). The research activity on optimal management of DH networks is still thriving because of the possibility to achieve high efficiency and increase exploitation of renewable energy sources and waste heat. In this paper, a multipurpose software for the optimal management of DH networks is propose and tested on a real network. The multipurpose software has the aim of achieving optimal management on demand side. The main goals of the proposed platform are: a) making data automatically gathered in the substations, suitable for modelling purposes b) automatically detecting fouled heat exchanger c) forecasting of the thermal request evolution of the building and d) indicating how properly perform demand side management, taking into account the network dynamics. The approach presented relies on a) a physical description of the district heating network and b) data collected by the monitoring systems usually installed in the district heating substations for billing purposes. For the first time in the author knowledge, a multipurpose platform including demand side management and fouling detection is tested on a large-scale application. The software is based on methodologies developed in years of studies and has been tested on a part of the largest district heating network in Italy.

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Utilization of District Heating Networks to Provide Flexibility in CHP Production

Cited by 51 publications

References 11 publications

Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

Flexibility from Electric Boiler and Thermal Storage for Multi Energy System Interaction

A comprehensive thermodynamic analysis of load‐flexible CHP plants using district heating network

Towards 4th Generation District Heating by Demand Side Management: A Real Application

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