Smart Grid
Vol.4 No.06(2014), Article ID:14612,8 pages
DOI:10.12677/SG.2014.46032

Study of Networked AGC System Model in Hydropower Station Considering Network Delay

Bo Wang1,2, Yang Ju3, Yanpin Li3

1College of Electronics and Information Engineering, Sichuan University, Chengdu

2Sichuan Mingxing Electric Power Co., Ltd., Suining

3School of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou

Email: 13982561720@163.com, juyang1990@163.com, liyanpin@ncwu.edu.cn

Received: Nov. 13th, 2014; revised: Dec. 10th, 2014; accepted: Dec. 17th, 2014

ABSTRACT

The structure and the network delay characteristics of networked AGC system are introduced and the models of traditional hydropower station AGC system are discussed in detail. Based on the analysis of network delay model and its simulation module, a new AGC system model considering network delay is proposed. Simulating by using MATLAB/Simulink software shows that the new model can achieve satisfactory control effect, which has a good control of network delay.

Keywords:Network Delay, AGC, Hydro-Generator, MATLAB

1四川大学电子信息学院，成都

2四川明星电力股份有限公司，遂宁

3华北水利水电大学电力学院，郑州

1. 引言

2. 网络化AGC系统

3. 网络时延

3.1. 网络时延的描述

(1)

Figure 1. The structure of networked AGC system

3.2. 网络AGC的时延特性

3.3. 网络时延的研究

4. 网络时延系统模型

4.1. 时延系统的数学模型

(2)

; (3)

4.2. 传统的AGC系统模型

4.3. 考虑网络时延的AGC控制系统

Figure 2. The model of the traditional AGC system

Figure 3. The model considered network delay

Figure 4. The diagram of time delay module simulation

4.4. 网络时延的AGC系统模型

5. 仿真实例

Figure 5. The model of inner loop system joined the coordinated controller

Figure 6. The model of AGC system considered network delay

Figure 7. The model of AGC system considered network delay built by Simulink

Figure 8. The frequency deviation of division one under the traditional AGC control method

Figure 9. The frequency deviation of division two under the traditional AGC control method

Figure 10. The frequency deviation of division one under the AGC control method considered network delay

Figure 11. The frequency deviation of division two under the AGC control method considered network delay

6. 结语

1) 本文所提出的针对新系统模型的网络时延是一个固定时延。而在实际系统中,由于系统网络的不确定会出现不同的网络时延，因此，还需要对具有随机时延的系统模型及其系统稳定进行下一步的研究。

2) 新系统模型没有考虑到系统中实际存在的非线性环节，例如：调速器死区。如果引入这些非线性环节,则需要用到非线性理论来分析，这些问题也有很大的应用意义，可作为下一步的研究方向。

3) 本文关于网络化AGC系统，只考虑了系统中的网络时延问题，对于系统之间的数据丢包等问题，还未进行过分析。因此，研究如何消除数据丢包对系统的影响，也是一个具有工程意义的课题。

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