基于动态模型的无触点有载调压系统

摘要

提出一种新型的时域无触点有载调压变压器动态模型.模型中用Jiles-Atherton理论来解决变压器铁心磁滞引起的非线性问题,并考虑了调压绕组的投切引起的变压器参数突变问题.采用传输线模型(TLM)方法求解动态模型,所得结果为时域值.动态模型适用于研究含过渡电阻的无触点有载调压过程,其分接开关由晶闸管构成.选择恰当的晶闸管开关时刻,可实现无冲击调压,即在过渡电阻和调压绕组投入、退出过程中电流、电压波形都保持连续、平滑.动态模型也适合于无过渡电阻有载调压和变压器保护等问题的研究.实验验证了该模型的正确性和实用性.%A dynamic model of contactor-less OLTC(On-Load Tap Changer) in time domain is proposed, which adopts the Jiles-Atherton theory to treat the nonlinearity caused by the hysteresis of transformer core and takes, into account the parameter mutation caused by the switching of regulating windings. The dynamic model applies TLM (Transmission Line Modeling) method to obtain the transient values in time domain, suitable for researching the on-load voltage regulation of contactor-less OLTC composed of thyristors as switches with transition resistor. The bumpless voltage regulation is realized by selecting the appropriate switching time of thyristors, I.e. The current and voltage waveforms maintain continuously and smoothly during the on-off of transition resistor' and regulating winding. The dynamic model is also suitable for researching the on-load regulation without transition resistor and the transformer protection. The experiment verifies the correctness and practicability of the dynamic model.