电气化铁道无功补偿毕业设计

摘要

本文研究的两相型SVG ( Static Var Generator, 静止无功发生器)电铁电能质量综合治理装置是针对我国某牵引变电站的运行方式而设计的,该牵引变电站从220kV变电所引入两回110kV电源,经阻抗匹配平衡变压器后分两个供电臂向电力机车供电。本课题设计的通过直流电容藕合的两相型SVG是针对该牵引变电站的电气特点提出的,可以有效减少牵引供电系统对电力系统的不良影响、保证电力机车的电压不低于正常工作的电压水平,从而提高系统和机车运行的可靠性和改善牵引供电系统电能质量。

本文简要论述了电能质量的概念与我国电铁电能质量的现状,介绍了当前基于电力电子技术的柔性交流输电系统的部分装置。阐述了牵引供电系统的原理及其负荷特性,对我国当前普遍采用的谐波和无功电流的检测方法进行了介绍。介绍了SVG原理,在此基础上提出了适用于我国的、基于阻抗匹配平衡变压器的高速电气化铁路牵引供电系统的电能质量综合治理的两相型SVG 方案,并研究了该SVG的补偿机理与算法。该方案和传统仅作为无功补偿的SVG相比,共用直流型SVG由于能进行有功功率的交换,抑制三相不平衡的能力进一步加强,充分发挥了SVG可以利用电压源型变流器。

关键词:电气化铁路,电能质量,无功补偿，阻抗匹配平衡变压器,两相型SVG

ABSTRACT

Two phase SVG study (Static Var Generator, without static var generator ) electrical railway power quality comprehensive treatment device is designed for the operation mode of our country in a traction substation .The two 110kV power traction substation is introduced from 220kV, the impedance matching balance transformer consists of two power supply to the electric locomotive power supply arm. The DC capacitor coupled two-phase type SVG this topic is the design of the electrical characteristics of the traction substation ,can effectively reduce the adverse effects. Traction power supply system for power system to ensure the voltage level voltage of electric locomotive is not lower than the normal work , so as to increase the reliability of the system and the operation of the locomotive and improve the traction power supply system the quality of electric energy.

This paper briefly discusses the concepts of power quality and our power in ferroelectric energy quality , introduces the current detection method commonly used and wattles current is introduced in this paper. Introduces the principle of SVG, puts forward the suitable for China ,based on high –speed electrified railway traction power supply system of the impedance matching balance comprehensive quality of governance, and the traditional wattless compensation only as compared to the SVG ,common DC type SVG due to the exchange of active power , ability to suppress the unbalanced three-phase to further strengthen ,give full play to the SVG using a voltage source converter.

Keywords: electric railway,power quality ,no power compensation ,the impedance matching balance transformer ,two phase SVG.

目录

第一章绪论

1.1研究牵引供电系统电能质量治理的意义 (1)

1.2无功功率及其影响 (2)

1.3负序电流的影响 (7)

1.4基于电力电子技术的无功和谐波补偿技术 (8)

第二章牵引供电系统原理及其负荷特性

2.1牵引供电系统的原理 (11)

2.2我国高铁牵引供电系统存在的问题及解决措施 (12)

2.3牵引变压器对供电特性的影响 (14)

2.4本章小结 (25)

第三章基于阻抗匹配变压器的并联补偿装置

3.1基于电压型逆变器的SVG (26)

3.2 SVG的基本原理 (27)

3.3二极管箝位型三电平变换器 (30)

3.4本章小结 (34)

第四章两相型SVG的控制策略

4.1电流值的实时检测方法 (35)

4.2 SVG的控制 (40)

4.3 本章小节 (44)

第五章总结 (46)

参考文献 (47)

致谢 (51)

附录 (67)