Probabilistic Steady-State Operation and Interaction Analysis of Integrated Electricity, Gas and Heating Systems

Abstract

The existing studies on probabilistic steady-state analysis of integrated energy systems (IES) are limited to integrated electricity and gas networks or integrated electricity and heating networks. This paper proposes a probabilistic steady-state analysis of integrated electricity, gas and heating networks (EGH-IES). Four typical operation modes of an EGH-IES are presented at first. The probabilistic energy flow problem of the EGS-IES considering its operation modes and correlated uncertainties in wind/solar power and electricity/gas/heat loads is then formulated and solved by the Monte Carlo method based on Latin hypercube sampling and Nataf transformation. Numerical simulations are conducted on a sample EGH-IES working in the "electricity/gas following heat" mode to verify the probabilistic analysis proposed in this paper and to study the effects of uncertainties and correlations on the operation of the EGH-IES, especially uncertainty transmissions among the subnetworks.

Hierarchical Multi-Objective Fuzzy Collaborative Optimization of Integrated Energy System under Off-Design Performance

“…The gas flow in pipeline is mainly controlled by adjusting the pressure of pressure regulating valves at different nodes. Next, it follows from [2,22,24] that, the steady state model of natural gas system is established.…”

“…The integrated energy system (IES) has become a vital strategic research direction in international energy field, due to its great significance in improving the comprehensive utilization efficiency of energy, the utilization efficiency of social infrastructure, and the energy supply security [1][2][3]. In addition, the IES also can promote the large-scale development of renewable energy and achieving energy conservation and emissions reduction in China [2,3]. At the same time, the remarkable change of energy production and consumption mode requires changing the construction path and development mode of traditional energy system and constructing IES [4][5][6].…”

“…In [12], a new sub-EH modeling structure consisted of heat hub, electricity hub, and cold hub was proposed, which took into account energy storage devices, such as electricity, cold and heat energy storage, realizing energy collection, distribution and storage of energy. However, in the above mentioned work, the multi-input and multi-output relationships of EH are generally reduced to linear coupling relationships [2,5]. In fact, devices usually have non-linear working characteristics which means deviation from the design performance [5,6].…”

Integrated Energy System Configuration Optimization for Multi-Zone Heat-Supply Network Interaction

“…Coupling of cold, heat and electric power loads between multi-region CCHP systems, coordinated planning and optimized operation of multi-zone systems, higher utilization of equipment than single CCHP systems, reduced configuration capacity, and significantly reduced operating costs, enabling multiple systems "Multiple horizontal complementarity, vertical source network charge and storage coordination". However, at present, there are few studies on multi-energy networks such as inter-area multi-energy flow access to grids, heat networks, gas networks, etc., in terms of mixed power flow and optimal scheduling among different energy networks [27][28][29][30].The above references mostly optimize the operation scheduling of integrated energy systems under the condition of known equipment capacity, and research on the collaborative planning of equipment capacity between various energy sources and between multiple regions is lacking. In this paper, a heat network is ingeniously introduced to regions of different load characteristics, In the references, the heating network construction of a single area is generally carried out.…”

“…Coupling of cold, heat and electric power loads between multi-region CCHP systems, coordinated planning and optimized operation of multi-zone systems, higher utilization of equipment than single CCHP systems, reduced configuration capacity, and significantly reduced operating costs, enabling multiple systems "Multiple horizontal complementarity, vertical source network charge and storage coordination". However, at present, there are few studies on multi-energy networks such as inter-area multi-energy flow access to grids, heat networks, gas networks, etc., in terms of mixed power flow and optimal scheduling among different energy networks [27][28][29][30].…”