Abstract
Cogeneration is becoming increasingly popular in building and community energy systems with demands on electricity and heat, which is suitable for residential and industrial use in remote areas. This paper considers a stand-alone cogeneration energy hub. The electrical and thermal energies are produced by a combined heat and power (CHP) unit, photovoltaic panels, and a solar thermal collector. Since solar units generate no electricity and heat during the night, energy storage units which shift demands over time can promote the usage of solar energy and reduce the fuel cost of the CHP unit. This paper proposes a method to retrieve the optimal operation cost as an explicit function in the capacity parameters of electric and thermal energy storage units, reflecting the value of energy storage in the cogeneration energy hub. The capacity parameter set is divided into a collection of polyhedrons; on each polyhedron, the optimal value is an affine function in the capacity parameters. Furthermore, the optimal sizes of system components are discussed. The capacity of the CHP unit is determined from a linear program, ensuring supply adequacy; the capacities of solar generation and energy storage units are calculated based on the cost reduction and the budget. Case studies demonstrate the effectiveness of the proposed method.
Highlights
Two main energy demands in the daily life of mankind are electricity and heat
The PV panel, solar collector, and energy storage units can be calculated from a simple linear program based on the optimal value function
This paper studies a solar-assist cogeneration energy hub and the role of electrical and thermal energy storage in reducing the fuel cost
Summary
Two main energy demands in the daily life of mankind are electricity and heat. Compared with the separated production mode, combined heat and power (CHP) generation enjoys a higher overall efficiency [1] because the waste heat in electricity generation is utilized to produce heat. Solar produces no energy during the night, maintaining power and energy balance requires additional energy storage units. A thermal system has large inertia and heat demand is often flexible, so the heating system can act as a flexible load of the electric system. The integration of cogeneration plants, electric system, and heating system promotes the concept of the energy hub, which has been an active research direction since the pioneering work in [3,4]
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