变频器驱动型提升机的稳定性控制技术研究

Research on Stability Control Technology of Frequency Converter Driven Hoist

煤矿通常位于较偏远的地区,即配电网末端,此时的电网阻抗较大,电网极可能表现出弱电网特性。由于节能减排的需要,变频器驱动型提升机在现代矿业生产中得到广泛应用,但是当电网较弱时会严重威胁到变频驱动型提升机的稳定性。首先分析了常规控制方式下变频驱动型提升机的稳定域,针对传统控制下提升机稳定域较小的问题,引入了基于权重前馈的控制方案,该方案可大幅提高弱电网下提升机的稳定域。最后搭建了实验系统,验证了理论分析的正确性和控制方案的有效性。

Coal mines are usually located in more remote areas,that is,at the end of the distribution grid network. At this time,the grid impedance is large, and the grid is likely to exhibit weak grid characteristics. Due to the need of energy saving and emission reduction,the frequency converter driven hoist is widely used in modern mining production, but when the power grid is weak,it will seriously threaten the stability of the frequency converter driven hoist. The stability region of the frequency converter driven hoist under conventional control strategy was analyzed. For the problem that the hoist stability domain is small under the traditional control,a weight-based feedforward control scheme was introduced,which can greatly improve the stability region of the hoist under weak grid. Finally, the experimental system was built to verify the correctness of the theoretical analysis and the effectiveness of the control scheme.