| 摘要: |
| 电气化铁路的牵引负荷引起的谐波电流和负序电流会给电力系统带来干扰。针对安装有阻抗匹配平衡变压器的牵引变电所，提出在2个牵引臂安装电能质量综合治理装置的方案解决牵引变电站的谐波、负序和无功补偿问题。该装置由感应滤波变压器和可逆PWM整流器组成，感应滤波变压器滤除3、5、7次主要次谐波并补偿部分无功，可逆的PWM整流装置动态补偿无功并实现有功电流由小的一侧向电流大的一侧补偿，使两牵引臂的负荷电流平衡，达到治理网侧负序电流的目的。分析了该装置实现谐波抑制、无功补偿、负荷平衡的机理。仿真结果证明了该补偿装置抑制谐波、负序以及提高功率因数的有效性。 |
| 关键词: 电气化铁道 电能质量 电路拓扑 变压器 整流器 谐波分析 负序电流 可逆PWM 整流器 负荷平衡 |
| DOI： |
| 分类号: |
| 基金项目:湖南省十一五重大科技专项（06GK1003-1）；湖南省教育厅重点项目（09A025） |
|
| Power quality improving device for electric railroads |
|
ZHU Hongping1,2, LUO Longfu1
|
|
1.Hunan University，Changsha 410082，China;2.Hunan University of Science and Technology，Xiangtan 411201，China
|
| Abstract: |
| The harmonic and negative sequence currents caused by the traction load of electric railroads will disturb power system. A solution is proposed for the traction substation equipped with the impedance-matching balance transformer，which has power quality improving devices installed in two traction arms to solve the problems of harmonic and negative sequence currents and reactive compensation. The device is composed of inductive filter transformer and reversible PWM rectifier，the former filters the 3rd，5th and 7th harmonics and compensates part of the reactive power while the latter compensates the reactive power dynamically and balances the active currents of two arms. The principle of its harmonic suppression，reactive power compensation and load balancing is analyzed and its effectiveness is proved by simulation. |
| Key words: electric railroads power quality electric network topology electric transformers electric rectifiers harmonic analysis negative sequence current reversible PWM rectifier load balancing |
