Time-domain modeling of grid-connected CHP for its interaction with the power grid

Da Xie, Aikang Chen, Chenghong Gu, Jun Tai

Research output: Contribution to journalArticle

4 Citations (Scopus)
48 Downloads (Pure)

Abstract

This paper presents a nonlinear dynamic model of grid-connected combined heat and power (CHP) system that can effectively simulate the thermoelectric interactions and examine the impact of the CHP on the power grid. Based on the theorems of mass balance and energy balance, this paper studies and analyses the principles and dynamic characteristics of the main CHP components, including gas internal combustion engine, synchronous generator, waste heat exchanger, water storage tank, exhaust-heat boiler, and gas fired boiler. Then, the nonlinear time-domain models for each component are built against input and output parameters in order to facilitate the study of CHP operation under various conditions. Subsequently, a simulation method that can deal with the coupling of all models with different time constants is proposed. Finally, dynamic simulation analysis of the developed CHP model is carried out on the MATLAB/Simulink. Extensive demonstration results show that the developed models are accurate to represent the thermoelectric interactions in the gird-connected CHP and capture the impact of these gird-connected CHPs on the power grid. This study is particularly beneficial to the design of new control strategies for CHPs to maximise its efficiency and stability value to the grid.

Original languageEnglish
Article number8362720
Pages (from-to)6430-6440
Number of pages11
JournalIEEE Transactions on Power Systems
Volume33
Issue number6
Early online date22 May 2018
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

  • Atmospheric modeling
  • Cogeneration
  • dynamic simulation
  • Grid-connected combined heat and power system
  • interaction
  • Internal combustion engines
  • Mathematical model
  • Power system dynamics
  • time domain model
  • Turbines
  • Water heating

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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