Primary frequency modulation control method for steam turbine generator of double-shaft combined cycle unit

Abstract

The invention discloses a primary frequency modulation control method for a steam turbine generator of a double-shaft combined cycle unit. The primary frequency modulation control method can be used for primary frequency modulation automatic control in the actual operation process of a steam turbine of the double-shaft combined cycle unit. On one hand, a closed-loop control mode is adopted, the heat supply network temperature set value is dynamically corrected in real time according to the network frequency deviation, reverse modulation of heat supply network temperature closed-loop control on primary frequency modulation is effectively avoided, thereby ensuring that the primary frequency modulation performance of a unit is accurate in the mode; on the other hand, primary frequency modulation feedforward control is added in heat supply network control logic, it is ensured that the primary frequency modulation performance of the unit is rapid in the mode, and the requirement for network-related assessment rules is integrally met. According to the primary frequency modulation control method, the labor intensity of operators can be effectively reduced, the control effect does not depend on the technical level of the operators, the real-time performance is good, the field debugging process is simple, and engineering implementation is facilitated.

Description

technical field [0001] The invention relates to the technical field of automatic control of a biaxial combined cycle unit, in particular to a primary frequency modulation control method for a steam turbine generator of a biaxial combined cycle unit. Background technique [0002] In recent years, with the large-scale access of new energy power and wind power, the network source structure has become more and more complex. In order to ensure the safety of the power grid, the regional power grids have successively issued "two detailed rules", which clearly require that the on-grid units must have the function of primary frequency regulation, and the performance of the primary frequency regulation of the units must be strictly assessed. [0003] The combined cycle is a way to use multiple thermodynamic cycles in series to obtain higher thermal efficiency. The gas-steam combined cycle unit uses the exhaust gas of the gas turbine to discharge into the waste heat boiler to heat the ...

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Problems solved by technology

[0005] The above-mentioned patents and documents are all aimed at the optimization of the primary frequency regulation function of the gas turbine generator in the dual-shaft combined cycle unit, without considering the primary frequency regulation function of the steam turbine generator, so it is necessary to control the primary frequency regulation of the steam turbine generator in the combined cycle unit In-depth research on the method to realize the primary frequency regulation function of the steam turbine generator of the combined cycle unit

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