Abstract:As the peak valley difference of grid load and the capacity of heating unit increase, the stability and dispatching of power grid are faced with great difficulties. In order to ease this situation, most of the heating units need participate in the peak load regulation while ensuring the heat supply. In this paper, a linear fitting of turbine working condition diagram was conducted and its fitting function was obtained, which could figure out the peak regulating range of cogeneration unit according to the information of current heating extraction flow, maximum main steam flow and minimum power, etc. This calculation method is convenient and rapid for engineering use because that the local thermal test is not required, and it was verified that the calculated peak regulating range is basically close to the actual range by living example.

Keywords:cogeneration unit, working condition diagram, peak regulating range, heating extraction flow, main steam flow