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 article, 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.
Highlights
Corresponding heat node of energy source i. Because it couples two energy systems with different time scales: With the requirement of real-time power balance, the electric power system is adjusted in minutes [3], whereas the heating system has much higher inertia and is usually adjusted in hours [4], [5]
Papers [6]–[8] propose to operate the combined heat and power system following the electric dispatch time scale by assuming the heating system can reach steady-state in minutes
A part of dispatch commands may not be executed in practice because of the slow response of the heating system whose dynamic process varies from dozens minute to several hours [12]
Summary
Cost function of CHP unit at energy source i at period t which does not include electric power terms. Lower/upper limits of electric power output of thermal generator at energy source i. The last dispatch period in the electric power system/heating system in the hybrid model. Jth cost coefficients of thermal generator/CHP unit at energy source i at period t. Heat power output of CHP unit at energy source i at period t. PCi,t /pTi,t /pGi,t Electric power outputs of CHP unit/thermal generator/tie-line power at energy source i at period t. Outlet temperatures of pipeline i at period t in heat supply/return networks. Outlet temperatures without heat loss of pipeline i at period t in heat supply/return networks. Inlet temperatures of pipeline i at period t in heat supply/return networks
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