Combined cycle unit steam turbine primary frequency modulation control method

Abstract

The invention discloses a combined cycle unit steam turbine primary frequency modulation control method, which can be used for primary frequency modulation automatic control in an actual operation process of a combined cycle unit steam turbine. According to the method, by using a closed-loop control mode, a heat supply network temperature set value is dynamically corrected in real time according to network frequency deviation, so that reverse modulation of heat supply network temperature closed-loop control on primary frequency modulation is effectively avoided, and it is ensured that the primary frequency modulation performance of a unit in the mode is also rapid and accurate; and by comprehensively considering the primary frequency modulation control performance of the unit, primary frequency modulation process dynamic feedforward control is adopted, the control performance and the control target of the primary frequency modulation action process are integrally optimized, and the network-related assessment rule requirements are met in a targeted manner. According to the invention, 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 combined cycle unit, in particular to a method for controlling primary frequency regulation of a steam turbine of a 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 steam on the basis ...

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Problems solved by technology

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

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