Primary frequency modulation dynamic compensation adjustment system and method based on performance index evaluation

Abstract

The invention discloses a primary frequency modulation dynamic compensation adjustment system and method based on performance index evaluation. The system includes a primary frequency modulation dynamic compensation adjustment calculation module, a frequency modulation dynamic compensation judgment module, a frequency modulation dynamic compensation output module, a frequency modulation power fixed value compensation module, and Valve position incremental compensation module and comprehensive valve position command generation module; through dynamic compensation and adjustment of frequency modulation power fixed value and comprehensive valve position increment, moderate overshooting is used to ensure the rapid return of grid frequency and the unit’s primary frequency regulation performance index meets standard requirements. The present invention calculates the dynamic compensation coefficient based on the primary frequency modulation action amplitude at the relevant time point of the unit and the action integral power within the corresponding time period, and adjusts the change amount of the primary frequency modulation of the unit in a targeted manner, thereby improving the accuracy of the response of the thermal power unit to the dispatching primary frequency modulation It satisfies the power grid's demand for work done by the unit's frequency modulation action, ensures its frequency modulation capability, and reduces the frequency fluctuation of the power grid system.

Description

technical field [0001] The invention relates to the technical field of frequency modulation of power supplies, in particular to a dynamic compensation adjustment system and method for primary frequency modulation based on performance index evaluation. Background technique [0002] With the increasing scale of new energy grid-connected and the rapid development of UHV power grids, the connection between power grids at all levels is becoming increasingly close, and the requirements for coordination and cooperation between power grids and units are also getting higher and higher. The primary frequency modulation in the grid source coordination function Become one of the effective means of stabilizing the power grid. For the current main components of China’s power grid and the main frequency regulation support, the primary frequency regulation of thermal power generating units is mainly through adjusting the intake valve of the DEH (Digital Electric Hydraulic Control System, di...

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Problems solved by technology

[0005] In the actual operation of the unit, due to the inherent delay characteristics of the actuators such as steam turbine valves, the jamming of the valves after long-term operation, the nonlinear characteristics caused by changes in flow characteristics, and the weakening of controller parameters, etc., Both will cause the reduction of frequency modulation control accuracy, leading to problems such as the substandard active power variation index and the qualified rate of monthly frequency modulation lower than the specified value.

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