Asynchronous Economic Dispatch for Combined Heat and Power Systems

Abstract

In the day-ahead economic dispatch of combined heat and power systems, the electric power system is adjusted in minutes because of the short dynamic time and the requirement of real-time power balance, while the heating system is dispatched in hours due to its large inertia and long dynamic process. However, the different dispatch time scales of electricity and heat are ignored by existing synchronous dispatch methods, which limits the improvement of system efficiency. To address this challenge, in this paper, the asynchronous dispatch method is proposed and instantiated by two different dispatch models featuring a short electric dispatch time scale and a long heat dispatch time scale. Case studies demonstrate the asynchronous dispatch method can overcome the efficiency and reliability problems caused by the existing synchronous dispatch methods.  Index Terms-combined heat and power system, different time scales, economic dispatch, dispatch interval.

Coupling Analysis for Multienergy Systems by Self and Cross Critical Load Level

“…In [8], a distributed operation model is proposed for an integrated electricity-heatgas system, where an efficient fully-distributed algorithm has been developed to solve the proposed model. In [9], a unified asynchronous economic dispatch is proposed to address the difficulty with the consideration of different dispatch time scales in heat and power systems. Research work [10] proposes t operation and investment benefit assessment model for MES while covering both local and national levels of heat and electricity infrastructures.…”

“…The first-order partial derivative for heat supply temperature at the heat source node is shown in (9), which equals zero at the optimal solution. Equation ( 9) can be reformulated to (8) by substituting the value of λi,t HS1 and λi,t HS2 with heat LMPs from (2).…”

An equivalent model‐based asynchronous dispatch method for clusters of flexible distributed energy resources

“…However, our goal is to eliminate the variables y k t in Equation (10) and find a concise expression of the flexibility region Γ k * t , which is only represented by the space formed by p PCC;k t and q PCC;k t variables. In order to find the boundary of the region Γ k t , we can solve a series of optimisation problems and use a polygon to approximate the flexibility region Γ k * t , that is max…”

“…The economic dispatch of combined heat and power systems was solved by the asynchronous dispatch method in ref. [10]. Moreover, a scenario‐based decomposition and asynchronous block iteration algorithm [11] is used for the economic dispatch problem.…”