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Optimal control system and method for primary frequency modulation of thermal power generating units based on water supply compensation

A technology for optimized control and thermal power units, applied in general control systems, control/regulation systems, adaptive control, etc., can solve problems such as units not up to standard, and achieve the effect of improving speed and accuracy

Active Publication Date: 2018-01-12
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

[0006] Therefore, how to solve the problem of thermal power units, especially double-reheated ultra-supercritical units with a large frequency difference and insufficient power in the next frequency modulation, is a technical problem of common concern for power plants and power grids.

Method used

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  • Optimal control system and method for primary frequency modulation of thermal power generating units based on water supply compensation

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Embodiment Construction

[0042] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the...

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Abstract

The invention discloses an optimal control system and method for primary frequency modulation of thermal power generating units based on water supply compensation. The system comprises a first subtraction device, a piecewise function module, a first adding device, a second subtraction device, a hysteresis module, a proportion module, a high or low limit amplitude module, an analogue quantity selector, a second adding device, a controller, an absolute value module, a first comparator, an operation module and a second comparator. According to the frequency deviation of a power grid, the main steam pressure is changed by using the change of water supply flow, so that the movement range of the primary frequency modulation of the generating units is effectively improved, the rapidity and accuracy of dispatching a primary frequency modulation response by the thermal power generating units are improved, and then the capability of frequency modulation is ensured, and the frequency fluctuationsof a power system are reduced.

Description

technical field [0001] The invention relates to the technical field of thermal power unit frequency modulation, in particular to a thermal power unit primary frequency modulation optimization control system and method based on feed water compensation. Background technique [0002] With new energy connected to the grid, load growth and the scale of the grid continue to increase, under the new situation of the interconnection of the UHV grid and the regional grid, the connection between the grids at all levels is becoming increasingly close, and the requirements for coordination and cooperation between the grid and the unit are also increasing. The higher the value, the primary frequency regulation in the network plant coordination function becomes one of the effective means to stabilize the power grid. The primary frequency regulation function of the generator set is an inherent function of the steam turbine generator set. It is mainly through adjusting the steam inlet regula...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 李军李杰张辉汪挺
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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