A Method for Determining the Stable Domain of Primary Frequency Regulation in the Power Mode of a Hydro Turbine Governor

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 ...

AI Technical Summary

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

Images