摘要
目前配电网无功补偿主要包括高压线路集中补偿和低压用户端分散补偿两种方式,针对两种补偿方式所存在的问题,提出了一种采用配电变压器一体化结构的无功功率补偿技术(DT-STATCOM)。该补偿技术主要以箱式变电站中配电变压器作为无功与电能质量控制节点,通过在变压器高压绕组设置连接抽头,构成变压器与静止无功补偿单元的一体化结构,从而能够充分利用配电变压器的富余容量,实现对变压器及其负载的动态补偿。并且通过合理选择连接抽头电压,可降低对功率器件耐压水平或通流能力的要求,有利于技术经济指标的优化。此外,一体化结构也有助于降低补偿装置的体积和成本,提高装置整体效率。同时,针对DT-STATCOM特殊结构所造成的补偿指令电流检测问题,本文提出跨端口瞬时无功电流检测方法,在此基础上设计了利用多侧信息的DT-STATCOM控制系统。最后,通过仿真和样机实验验证了DT-STATCOM技术对动态补偿电网无功、支持变压器端口电压和抑制电网三相不对称的补偿效果和控制性能。
There are two compensation methods during distribution system currently： high voltage centralized compensation and low voltage user end distributed compensation.Towards the problems of the two compensation method,this paper proposes a technology of integrating distribution transformer and static var compensation（DT-STATCOM）.The technology takes the distribution transformer of box substation as the control node of reaction power and power quality.It uses the surplus capacity of transformer to compensate the reactive power.And by setting the connect voltage reasonably,it decreases the withstand voltage level and current capacity of switching devices,which benefit the economic and technical indicators.In addition,the integration structure reduces the volume and cost of compensation device.Meanwhile,towards the command current detection problem caused by the special structure of DT-STATCOM,this paper proposes a novel reactive current detection method across the transformer’s ports.Then the paper designes the control system based on the multi-lateral information.At last,the simulation and prototype test show that,the DT-STATCOM system had significant effect on dynamic reactive power compensation,transformer voltage support and imbalance inhibition.
出处
《电工技术学报》
EI
CSCD
北大核心
2012年第10期262-269,共8页
Transactions of China Electrotechnical Society
基金
国家高技术研究发展计划(863计划)先进能源技术领域高效节能与分布式供能技术专题探索导向类项目(2009AA05Z208)
关键词
配电变压器
负载率
STATCOM
一体化
无功补偿
Distribution transformer
load levels
static var compensation
reactive power compensation
