Abstract
Currently, all generating equipment with a capacity of more than 25 MW operates in the wholesale electricity market. The operation of combined cycle gas turbines is complicated by the implementation of daily load schedules. A distinctive feature of the operation of combined-cycle units is the presence of a gas and steam turbine in the cycle. In this paper, the variable operating modes of a combined cycle plant are considered. The minimum effective load of a gas and steam turbine is determined. An example of the real operation of a steam turbine that is included in a combined cycle plant 110 MW power unit at an operating combined heat and power is shown. The optimal minimum load of a combined cycle gas turbine unit has been determined. As a result of the research, the values of high and low pressure steam flow rates, fuel gas consumption, steam and gas turbine power were obtained. Based on the research results, the optimal minimum load of a combined cycle gas turbine unit was found - 40 MW. This load allows the main and auxiliary equipment to work without compromising reliability.
Highlights
According to the energy development strategy until 2035, the introduction of new generating equipment based on gas turbine units is envisaged
When working on the wholesale electricity market, it is necessary to comply with the daily schedule of electrical loads
This paper considers the problem of changing the main economic and energy characteristics of a combined cycle power unit at a minimum load
Summary
According to the energy development strategy until 2035, the introduction of new generating equipment based on gas turbine units is envisaged. Gas turbines are used when upgrading or replacing used equipment. At the same time, a lot of research is devoted to studying the work and increasing the efficiency of gas turbine plants [1]. When working on the wholesale electricity market, it is necessary to comply with the daily schedule of electrical loads. Gas turbine units have very good manoeuvrability. Starting and reaching the maximum load is possible in a very short period, no more than 30 minutes, use in half-peak mode is common when operating in a common power system [2,3,4,5,6]
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