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 comprises a primary frequency modulation dynamic compensation adjustment calculation module, a frequency modulation dynamic compensation determination module, a frequency modulation dynamic compensation output module, a frequency modulation power constant-value compensation module, a comprehensive valve position increment compensation module and a comprehensive valve position command generation module. By performing dynamic compensation adjustment on a frequency modulation power setting and a comprehensive valve position increment, a moderate overshoot is used to ensure the rapid return of a grid frequency and ensure that a unit primaryfrequency performance index meets a standard requirement. The method calculates a dynamic compensation coefficient according to the amplitude of the primary frequency modulation operation at a relevant time point of the unit and the operation integral power amount in a corresponding time period, and adjusts the variation quantity of the primary frequency modulation of the unit in a targeted manner, thereby improving the accuracy of the thermal power generation unit to schedule the primary frequency modulation response, satisfying the demand of the grid for the unit primary frequency modulationoperation, ensuring its frequency modulation capability and reducing the frequency fluctuation of a 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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