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Title: Combined analysis of electricity and heat networks
Author: Liu, Xuezhi
Awarding Body: Cardiff University
Current Institution: Cardiff University
Date of Award: 2013
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The use of Combined Heat and Power (CHP) units, heat pumps and electric boilers increases the linkages between electricity and heat networks. In this thesis, a combined analysis was developed to investigate the performance of electricity and heat networks as an integrated whole. This was based on a model of electrical power flow and hydraulic and thermal circuits together with their coupling components (CHP units, heat pumps, electric boilers and circulation pumps). The flows of energy between the electricity and heat networks through the coupling components were taken into account. In the combined analysis, two calculation techniques were developed. These were the decomposed and integrated electrical-hydraulic-thermal calculation techniques in the forms of the power flow and simple optimal dispatch. Using the combined analysis, the variables of the electrical and heat networks were calculated. The results of the decomposed and integrated calculations were very close. The comparison showed that the integrated calculation requires fewer iterations than the decomposed calculation. A case study of Barry Island electricity and district heating networks was conducted. The case study examined how both electrical and heat demands in a self-sufficient system (no interconnection with external systems) were met using CHP units. A solution was demonstrated to deliver the electrical and heat energy from the CHP units to the consumers through electrical and heat networks. The combined analysis can be used for the design and operation of integrated heat and electricity systems for energy supply to buildings. This will increase the flexibility of the electricity and heat supply systems for facilitating the integration of intermittent renewable energy.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TK Electrical engineering. Electronics Nuclear engineering