杨招虎

[中图分类号] fM761.12

[文献标志码]A

[文章编号]2095-6487 （2021） 02-0079-02

Application of Low Voltage Dynamic Reactive Power Compensation

Device SVG in Factory Low Voltage Distribution System

Yang Zhao-hu

[ Abstract]

ne power supply sysrem in the production area of a factory adopts the decentralized power supply mode， which is mainly composedof llOkV main substation，

lOkV distribution station， 380V substation in the factory site， etc. The equipment of power supply system in the plant area iswidely distributed. The power supply range of a main substation is as long as 7-8km， and a large amount of capacitive reactive power is generated duringthe operation of cables. Two sets of high voltage dynamic reactive power compensation devices are installed in 110 kV main substation， the power factoiis hnproved accordingly， which meets the requirements of power supply company. The high-voltage cables from lOkV power distribution station to eachplant are widely distributed and long distance， about 200km; the power factor oflow-voltage part is loxv， some plant electrical equipment produce largeharmonics， and the power quality of power grid is poor， which needs urgent treatment. At present， the low-voltage dynamic reactive power compensationdevice SVG is added to the 380V substation in the plant site， which significantly improves the power quality of the power supply system， increases thepower factor， reduces the reactive power loss， and saves energy and protects the environment

[ Keywords]

power quaUry; dynamic reactive power compensation; SVG; energy saving and envirorunental protection; power factor

目前某工廠变电站内部分无功补偿柜使用年限较长，出现电容鼓包，接触器、电抗器烧毁现象，故障率越来越高，损坏后不易恢复。低压动态无功补偿装置是一种在变电系统和输配电系统中提高电网侧及负载端的功率因数，降低变电站内变压嚣等负载端及输配电系统输送线路自身的无功电能损耗，电能补偿供配电系统内的电压暂升、暂降，提高系统供电质量，改善供电系统环境的设备。因此，对生产区某厂房变电站无功补偿柜改造为动态无功补偿装置SVG柜。

1 系统设计

1.1 原有系统数据测试

某变电站3#变压器测试数据及分析（表1）。

1.2 系统补偿方案

根据测试数据：某厂房变电站3#变压器容量1600 KV，变压器负荷率：55%;后端负载主要为空调机组及数控设备，该供电系统原来配置无功补偿柜一台，设备容量：400 kVar;无功补偿设备故障频发，无法正常投入使用，而系统功率因数为：0.85，功率因数无法满足系统要求。

故对无功补偿柜进行改造，根据技术的发展，选用目前市场先进的SVG动态无功发生器代替现有的无功补偿柜，对该供电系统进行无功补偿。

1.3 某厂房变电站3#变压器安装SVG无功补偿装置工作原理

SVG动态无功补偿装置就是将自动换相桥式整流电路通过滤波电抗器并联到某厂房3#变电站的变压器输出侧，合理地调节补偿装置的桥式整流电路的交流输出端的电压幅值及其相位，电可以直接控制补偿装置交流输出端的电流人小，使补偿装置的超级电容（阻容吸收电路）吸收或者输出满足使用要求的电流分量，实现3#变电站供配电系统的动态无功补偿H的及解决短时电压暂降问题，补偿原理如图1所示。……