Optimal integrated sizing and planning of hubs with midsize/large CHP units considering reliability of supply. (15th September 2017)

• Record Type: Journal Article
• Authors: Moradi, Saeed; Ghaffarpour, Reza; Ranjbar, Ali Mohammad; Mozaffari, Babak
• Is Part Of: Energy conversion and management. Volume 148(2017)
• Page Start: 974
• Page End: 992
• Publication Date: 2017-09-15
• Subjects: Midsize/large CHP -- Energy hub -- Integrated sizing and planning -- Feasible operating region -- Linearization of two-variable CHP fuel function -- Reliability of supply; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2017.06.008
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: New hub planning formulation is proposed to exploit assets of midsize/large CHPs. Linearization approaches are proposed for two-variable nonlinear CHP fuel function. Efficient operation of addressed CHPs & hub devices at contingencies are considered. Reliability-embedded integrated planning & sizing is formulated as one single MILP. Noticeable results for costs & reliability-embedded planning due to mid/large CHPs. Abstract: Use of multi-carrier energy systems and the energy hub concept has recently been a widespread trend worldwide. However, most of the related researches specialize in CHP systems with constant electricity/heat ratios and linear operating characteristics. In this paper, integrated energy hub planning and sizing is developed for the energy systems with mid-scale and large-scale CHP units, by taking their wide operating range into consideration. The proposed formulation is aimed at taking the best use of the beneficial degrees of freedom associated with these units for decreasing total costs and increasing reliability. High-accuracy piecewise linearization techniques with approximation errors of about 1% are introduced for the nonlinear two-dimensional CHP input-output function, making it possible to successfully integrate the CHP sizing. Efficient operation of CHP and the hub at contingencies is extracted via a new formulation, which is developed to be incorporated to the planning and sizing problem. Optimal operation, planning, sizing and contingency operation of hub components are integrated and formulated as a single comprehensive MILP problem. Results on a case study with midsize CHPs reveal a 33% reduction in total costs, and it is demonstrated that the proposed formulation ceases the need for additional components/capacities for increasing reliability of supply.