Abstract
In the development of the energy industry, environmental impact, particularly carbon emission has always been a great challenge. Combined heat and power (CHP), as a highly efficient method to simultaneously generate both electricity and heating, is playing a crucial role in the power industry, which possesses the following features: 1) it uses cleaner energy source such as natural gas, biomass compared to traditional fossil-fuelled power plants; 2) it could significantly reduce carbon emissions by capturing the heat produced as a by-product. The trend of interconnecting various energy vector infrastructures and energy services requires more energy conversion technologies. The multi-carrier energy system is thus introduced to allow the interactions of different energy carriers, enabled by energy conversion and storage technologies.CHP is playing an important role as a coupler for multi-carrier energy system. The optimal CHP planning and operation in multi-carrier energy system has become a hot topic. There are two main aspects: one is the combined model of multiple-carrier energy flows, which should be formulated and the other is to find suitable CHP planning and operation schemes. A vast number of optimal CHP planning and operation methodologies have been proposed. Most of them are motivated by energy savings. However, they are limited to the economic contribution of CHP while ignoring its wider impact on multi-carrier energy systems.Therefore, this thesis has carried out an intensive research on optimal CHP planning and operation, and then analysed the impact on multi-carrier energy system investment and energy costs. The major contributions are summarised as follows:
Investigate the correlation between gas and temperature to obtain the gas load characteristics for the further CHP planning and operation.
Propose an optimal CHP planning method considering the future investment from the perspective of the electricity network operator.
Extend and improve the proposed CHP planning method in a multi-carrier energy system with both gas and electricity network considering the future network.
Propose a multi-objective optimal CHP operation model cooperated with an energy hub (EH) system considering the investment cost (InC), energy cost and carbon emission cost.
These proposed methodologies are demonstrated on the practical distribution system in different scenarios with sensitivity analysis and the results are proven to be effective and applicable. The optimal CHP planning considers the impact of the CHP on the multi-carrier energy systems and benefit system operators with reduced InCs with CHP’s installation. The short term optimal CHP operation benefits local network owners with reduced energy cost and carbon cost savings compared to traditional generation.
| Date of Award | 30 Apr 2019 |
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| Original language | English |
| Awarding Institution |
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| Supervisor | Chenghong Gu (Supervisor) & Furong Li (Supervisor) |