10 kV串联补偿电容器对异步电动机启动的影响研究

Research on Influence of 10 kV Series Compensation Capacitors on Starting of Asynchronous Motors

目前,配电网存在的主要问题为网架薄弱、电网结构不合理、导线截面偏小、供电半径偏大、配电变压器数量和大容量电机负荷增长迅速及负荷功率偏低等,这些问题导致配电线路沿线电压跌落严重、线损高、功率因数低、输送容量小、电压闪变频繁等。为此本文首先介绍了10 k V串联电容器补偿的工作原理、主要组成以及安装位置和容抗选择,然后分析了异步电动机等效模型,最后通过Matlab仿真,研究了串联补偿电容器不同的安装位置、容抗的大小、并联电阻等情况下,串联补偿电容器对异步电动机启动的影响,为串联电容器补偿装置的设计和工程实践提供了有益的参考。

At present,the main problems existed in the distribution network are weak network frame,unreasonable network structure,small cross sectional area of conductor,large power supply radius,fast increase of number of distribution transformer and of load of high power motor as well as low load power,leading serious voltage sag,high line loss,low power factor,small transmission capacity and frequent voltage flicker of the distribution line.For this purpose,the working principle,main composition,selection of installation position and capacitive reactance of 10 kV series capacitor compensation are introduced in this paper.Then,the equivalent model of the asynchronous motor is introduced.Finally,the influence of series compensation capacitors on the starting of asynchronous motor at such situations as different installation positions,magnitude of capacitive reactance and shunt resistance of series compensation capacitors is analyzed through Matlab simulation,which provides useful references for the design and engineering practice of series capacitor compensation devices.