Control system for improving primary frequency modulation response behavior of thermal power generating unit

Abstract

The invention discloses a control system for improving a primary frequency modulation response behavior of a thermal power generating unit. Comprising a first minimization module, a second summator, a second inertia module, a second minimization module, a high-frequency output reduction signal input end, a third analog quantity switching module, a pre-frequency-modulation power instruction input end, a post-frequency-modulation power instruction input end, a frequency modulation power instruction input end, a primary frequency modulation action signal input end and an actual power dynamic average value input end. The system comprises a first analog quantity switching module, a first maximizing module, a first summator, a first inertia module, a second maximizing module, a low-frequency output increasing signal input end and a second analog quantity switching module, can effectively solve the problem that the actual action integral electric quantity is opposite to the theoretical integral electric quantity, and improves the actual action integral electric quantity of primary frequency modulation at the same time.

Description

technical field [0001] The invention belongs to the field of thermal power generating unit control, and relates to a control system for improving the primary frequency modulation response behavior of a thermal power generating unit. Background technique [0002] Primary frequency regulation means that when the frequency of the power system deviates from the target frequency, the generator set adjusts the active power output to reduce the frequency deviation through the automatic response of the speed regulation system. The National Energy Administration's regional regulatory bureau document "Detailed Implementation Rules for the Management of Auxiliary Services for Grid-connected Power Plants" stipulates that primary frequency regulation is an auxiliary service that must be provided by grid-connected generator sets to ensure the safe and stable operation of the power system and ensure power quality. my country's power grid frequency is in a dynamic balance state of 50Hz. Whe...

AI Technical Summary

Problems solved by technology

In addition, the calculation rules for the integral power of a frequency modulation actual action in the "Implementation Rules for Grid-connected Operation Management of Power Plants" use the actual output average value within a few seconds before a frequency modulation action. If the power command (before frequency modulation) is used as the power The reference value, when the load of the generating set changes, it is very likely that the integrated power of the actual action of a frequency regulation will not reach the specified theoretical integral power

[0005] Therefore, when the generating set needs to reduce its output when encountering the high frequency of the power grid during the load-up process, or when the generating set encounters the low frequency of the power grid and needs to increase the output during the load-down process, it is very likely that the actual operating integral power will be different from the theoretical integral. The case of power reverse

However, when the load of the generating set changes or the frequency of the power grid changes frequently, the actual integral power of a frequency modulation may not reach the specified theoretical integral power.

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