摘要
为了解决偏远山村、通信基站、郊区工厂等负荷的供电问题,通过特制的大容量电压互感器(PT)可实现从高压铁塔或架空线路直接取电,从而实现灵活取电、就地供电的要求。取电装置的负荷中,含大量非线性负荷,而取电装置直接接入高压输电线路,必然在线路中注入一定的谐波。以110 k V输电线路的单相PT取电装置为对象,考虑接入负荷类型及容量,提出了一种基于感应滤波的高压取电装置谐波抑制方法。首先对110 k V输电线路单相PT取电装置的引下线及塔型布置方案、谐波源负荷情况进行分析,建立相应的仿真模型,得到取电装置注入电网的谐波含量与取电装置容量的关系,进而确定取电装置接入电网的容量限值。分析了基于感应滤波的单相PT取电装置的拓扑及等效电路,并推导了输出电压与输入电压的传递函数,设计了感应滤波绕组和调谐装置的参数。仿真结果表明感应滤波及其调谐装置对不同谐波成分均有良好的衰减效果。可见,利用感应滤波对取电装置进行谐波抑制能减小取电装置接入对电网的影响,具有良好的经济性和技术性。
In order to solve the power supply problems of remote villages,communication base stations,suburban factories and other loads,a special large-capacity potential transformer( PT) can be used to extract power directly from high-voltage tower or overhead line,thus realizing the requirement of flexible and on-site power supply.A large number of non-linear loads are included in the load of the power extraction device,while the power extraction device is directly connected to the high-voltage transmission line. Therefore,large amount of harmonics will inject into the transmission line. Taking 110 kV transmission line’s single-phase PT extraction device as the example,considering the type and capacity of load,a method of harmonic suppression method based on inductive filtering was proposed. First of all,the layout and harmonic source of 110 k V single-phase PT device was analyzed,corresponding simulation model was established,and the relations between the harmonic content injected into the power grid and the capacity of the PT device was obtained,and then determined the capacity limit of the PT device connected to the power grid. The topology and equivalent circuit of single-phase PT device based on inductive filtering were analyzed,and the parameters of PT and tuning device were designed. The simulation results demonstrate that inductive filtering and its tuning device have good attenuation effects on different harmonic components. It can be seen that the use of inductive filtering to suppress the harmonics of the PT device can reduce the influence of the access of the PT device connected to the power grid,and has good economic and technical characteristics.
作者
黄星
廖建权
王山
彭庆军
王强钢
周念成
HUANG Xin;LIAO Jian-quan;WANG Shang;PENG Qing-jun;WANG Qiang-gang;ZHOU Nian-cheng(Yunnan Power Grid Electric Power Research Institute (Group) Co., Ltd., Kunming 650217, China;State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University), Chongqing 400044, China)
出处
《科学技术与工程》
北大核心
2019年第25期191-196,共6页
Science Technology and Engineering
基金
国家自然科学基金(51577018)资助
关键词
高压取电
感应滤波
谐波抑制
调谐滤波器
high voltage power extraction
inductive filtering
harmonic suppression
tuning filter
