﻿ 微电网中同步发电机调频特性分析 Analysis of Frequency Modulation Characteristics of Synchronous Generators in Microgrid

Advances in Energy and Power Engineering
Vol.05 No.04(2017), Article ID:21860,7 pages
10.12677/AEPE.2017.54015

Analysis of Frequency Modulation Characteristics of Synchronous Generators in Microgrid

Xincai Liu1, Yingming Geng2

1Department of Electrical Engineering, Shandong Polytechnic, Jinan Shandong

2School of Electrical Engineering, Shandong University, Jinan Shandong

Received: Jul. 30th, 2017; accepted: Aug. 21st, 2017; published: Aug. 30th, 2017

ABSTRACT

In the island mode with no support of large power grid, the stable operation is maintained only by distributed energy. We can take synchronous generator as main control unit. This paper focuses on the synchronous generator speed control system characteristics and simulation. The main research contents include the establishment of synchronous generator speed control system and automatic power generation control system mathematical model and the stability analysis of the speed control system. Then through simulation of different load changes, the characteristics of synchronous generator’s differential regulation and non-differential regulation are studied, which supports the stable operation of micro-grid.

Keywords:Micro-Grid, Island Operation, Synchronous Generator, Frequency Modulation Characteristics

1山东职业学院，电气系，山东 济南

2山东大学，电气工程学院，山东 济南

1. 引言

2. 同步发电机数学模型

2.1. 负荷频率控制

(1)

2.2. 自动发电控制

(2)

3. 微电网中同步发电机调速特性仿真分析

Figure 1. Synchronous generator load frequency control

Figure 2. Independent power generation system AGC

3.1. 同步发电机有差调节

3.1.1. 调差系数分析

(3)

(4)

3.1.2. 有差调节建模仿真

(5)

Figure 3. Simulation of different modulation coefficients

Figure 4. Modeling of differential regulation

Figure 5. Simulation of differential regulation

3.2. 同步发电机无差调节

(6)

(7)

4. 结论

1) 同步发电机的调差系数和积分控制增益会影响系统的暂稳态性能，调差系数R越小，稳态误差越小，调节时间会增长，而过小会导致系统不稳定。因此需要选择适当的调差系数。同时积分控制增益也不宜过大。

2) 一次调频所能调整的负荷变化具有一定限度，负荷变化较大时仅由一次调频作用会导致频率发生

Figure 6. Modeling of non-differential regulation

Figure 7. Simulation of non-differential regulation

Analysis of Frequency Modulation Characteristics of Synchronous Generators in Microgrid[J]. 电力与能源进展, 2017, 05(04): 92-98. http://dx.doi.org/10.12677/AEPE.2017.54015

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