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Primary frequency modulation stability domain determination method of water turbine speed regulator under power mode

A power mode and determination method technology, applied in the direction of instruments, control/regulation systems, adaptive control, etc., can solve problems such as primary frequency modulation systems that are not suitable for accurate analysis of nonlinear

Active Publication Date: 2015-04-08
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] The primary frequency regulation system under the power mode of the turbine governor has obvious nonlinear characteristics, but most of the current analysis methods for the stability domain of the turbine regulation system are based on linear theory, that is, the nonlinear system is approximated as a linear system for analysis. This type of method makes the entire system generate Therefore, it is not suitable for accurate analysis of nonlinear primary frequency modulation system

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  • Primary frequency modulation stability domain determination method of water turbine speed regulator under power mode
  • Primary frequency modulation stability domain determination method of water turbine speed regulator under power mode
  • Primary frequency modulation stability domain determination method of water turbine speed regulator under power mode

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[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0048] The method for determining the stability domain of the primary frequency modulation under the power mode of the hydraulic turbine governor of the present invention, its core idea is to establish the nonlinear hydraulic turbine governor model of the primary frequency modulation under the power mode by considering the nonlinear characteristics, and then introduce the hopf bifurcation theory to the nonlinear The bifurcation analysis of the hydraulic turbine regulating system is carried out, and then the range of the stable domain of the first frequency regulation under the power mode of the hydraulic turbine governor is solved.

[0049] Such as figure 1 As shown, the method for determining the stable domain of frequency regulation under the power mode of the...

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Abstract

The invention discloses a primary frequency modulation stability domain determination method of a water turbine speed regulator under the power mode. The method comprises steps that, 1), a non-linear water turbine speed regulator model for primary frequency modulation under the power mode is established, the non-linear water turbine speed regulator model comprises a PID control link and a non-linear link, and a water turbine adjusting system model is established according to the non-linear water turbine speed regulator model; and 2), PID parameters of the PID control link are taken as bifurcation parameters, bifurcation conditions satisfied by the PID parameters during generation of hopf bifurcation are solved according to the water turbine adjusting system model; boundary of a primary frequency modulation stability domain of the water turbine speed regulator under the power mode is acquired through the bifurcation conditions, and a scope of the stability domain is determined according to the boundary of the stability domain. Through the method, the primary frequency modulation stability domain of the water turbine speed regulator under the power mode can be effectively determined; the method further has advantages of simple method and high precision.

Description

technical field [0001] The invention relates to the technical field of hydroelectric unit control, in particular to a method for determining the stability domain of the primary frequency regulation in the power mode of a hydroturbine governor. Background technique [0002] The grid frequency is an important indicator reflecting the safe and stable operation of the power system and power quality. If the grid frequency changes beyond the allowable value, it will have adverse effects on the operation of users and power plants, and at the same time bring great economic losses. The stability of power system frequency mainly depends on the balance of power output and power consumption in the power system. At present, the control methods of power grid frequency mainly include primary frequency regulation (PFR), secondary frequency regulation (SFR), high-frequency cut-off, automatic low-frequency load shedding, etc. , where primary frequency modulation has become an important means ...

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Application Information

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IPC IPC(8): G05B13/04
Inventor 付亮
Owner STATE GRID CORP OF CHINA
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