基于单相有源滤波技术的新型消弧线圈的研究

随着城市配电网容量的日益增大,非线性负荷及电缆线路的大量增加,在接地故障电流日益提高的同时,其中的谐波及有功分量也随之大幅提高。而传统的消弧线圈无法对接地故障电流中的谐波及有功分量实现补偿,导致接地点残流难以控制在规定范围内,这严重威胁电网的安全运行。为此,提出一种基于单相有源滤波技术的新型消弧线圈,通过有源注入的方式实现对接地电流的全补偿。详细介绍了它的工作原理和预随调相结合的调谐方式,并设计了基于H-Infinity控制理论的注入电流控制方法。计算机仿真及10 kV高压物理模拟实验验证了其有效性。

Research on new type arc-suppression coil based on single-phase active power filter technology

As the increasing capacity of MV power system,more non-linear loads and more buried cables using,the earth-fault current increases much more than before.The result is that the percent of harmonic and active current also grows much more,and can not be neglected.Since classical arc-suppression coil can not compensate the harmonic and active component.Its earth-fault current in power networks become much harder to keep the fault spot current under normal level,and has greatly threatened the security and reliability of the power networks.To solve this problem,this paper presents a new type of principal-auxiliary arc-suppression coil based on single-phase active power filter(APF) technology.By injecting the active current,it realizes the full component of the earth-fault current.In this paper,the work principles of the new device,and a combinational compensation mode of presetting and following-setting mode are analyzed in detail.In addition,a continuous time injecting current controller based on H-Infinity control theory is also designed.The results of the simulation with computer and 10kV physical simulating experiments verify the reliability and validity of the new principal-auxiliary arc-suppression coil.