一种基于负载识别的交流接触器合闸涌流抑制策略

针对接触器在控制阻容和阻感性负载时吸合阶段可能出现涌流的问题,分析了不同负载与不同合闸相位角下的电流变化情况,找到了合闸相角和负载功率因数角对涌流的影响关系,并以此为基础提出了一种抑制涌流的开关合闸控制方案。本文通过公式推导开关在阻容、阻感性负载时吸合的暂态过程,找到了不同负载下的最佳合闸相角,并使用Multisim搭建硬件仿真电路,模拟不同负载时的开关吸合过程,通过检测合闸后触头回路的电流零点,提出了一种智能识别负载性质和判断涌流抑制情况的合闸控制策略,最后使用实验室研发的单极交流接触器进行带载实验,对负载的识别准确且抑制涌流的效果明显,实验结果和理论仿真一致,对接触器的智能控制具有一定的参考意义。

Inrush current suppression strategy of AC contactor closing based on load recognition

Aiming at the inrush current problem of contactor under the resistance capacity and perceptual load resistance and phase, analyzed the current under different load and different closing phase Angle changes, found out the closing phase Angle and load power factor Angle of the influence of the flow, and on this basis, this paper proposes a flow switch switching control scheme. In this paper, through the formula derivation of switch in resistance capacitance, resistance inductive load transient process, find the best closing phase Angle under different loads, and the use of Multisim to build hardware simulation circuit, simulation of different load switch closing process, by detecting the current zero of the contact circuit after closing, Put forward a kind of intelligent identify the nature of the load and judge the inrush current suppression switching control strategy, finally using laboratory research and development of unipolar contactor on load experiment, the recognition of load accurately and suppress flow effect is obvious, the experimental results and theoretical simulation, control of the contactor closing process has certain reference significance.