RETRACTED: Low-Order Frequency Response Model in the Application of Frequency Control

Gao Zheng

doi:10.4028/www.scientific.net/amr.518-523.3820

Abstract

Retracted paper: This paper introduces a low-order system frequency response model (SFR). SFR model is simplified from other models, which can be used to estimate the frequency response of a large power system, or sudden load disturbance of the island.SFR model is based on the neglecting nonlinear power system of u the units equation, which is controlled by the steam turbine generator . This means that the generator inertia and reheat time constant make system average frequency response. In addition, because of the two time constant , the resulting frequency response can be calculated in the closed loop form, which provides a simple and accurate method to estimate the essential characteristics of the system frequency response.

Highlights

E Example R A The System Of the Equivalent System ResponseIt is very effective to examine the results of the transient response through several important parameters
E Introduction T Electric power system frequency is one of the important indexes of power quality, which is one of the most important parameters in the power system operation
A Research on a unified frequency model can be traced back to 70 years ago, common methods is the reference on the model of the Rudenberg[1], who offers a lot of the aspects as the concept of mathematical deduction

Summary

E Example R A The System Of the Equivalent System Response

It is very effective to examine the results of the transient response through several important parameters. From the equation (8), we can calculate the slope of the response. We care about two values as follows. The first one is when t=0, corresponding is the biggest slope value, and when slope is 0, corresponding is the largest frequency deviation. If ωrt nπ in equations (19),We use the parameter of tz ,we can calculate (18) (19). In figure 4,The initial slope depends on Pstep andH. If we change the two parameters, the initial slope will change. Tz is not the function of Pstep ,so the biggest frequency deviation occurs in exactly the same time (2.35 s) disturbance If we change the two parameters, the initial slope will change. tz is not the function of Pstep ,so the biggest frequency deviation occurs in exactly the same time (2.35 s) disturbance

High pressure points FH

Conclusions