无功控制的电铁电能质量治理装置和运用分析

电气化铁路项目运作阶段使电网系统容易滋生低功率因数、大负序电流,降低电网运行过程的安稳性。为应对以上情况,提出在铁路车站周边安置无功补偿装置(SVG)的建议,并拟编了SVG并联式运转及联合应用高压电容器组的补偿方案,规划SVG的控制思路。工程实践表明,该装置投用后,电网系统功率因数从最初的0.78提升至0.97,不均衡度由最初的20.44%降至1.80%;系统谐波频率明显降低,3次与5次谐波的含有率均值由最初的23.35%、12.35%依次降至4.43%、2.47%,这提示SVC能较明显的优化牵引网的电网品质,值得推广。

In the operation stage of electrified railway project, the power grid system is easy to generate low power factor and large negative sequence current, and reduce the stability of power grid operation process. In order to deal with the above situation,the suggestion of installing Static Var Generator(SVG) around railway station is put forward, the compensation scheme of SVG parallel operation and combined application of high voltage capacitor bank is drawn up, and the control idea of SVG is planned. The engineering practice shows that after the device is put into operation, the power factor of the power grid system is increased from 0.78 to 0.97, the imbalance is reduced from 20.44% to 1.80%, the harmonic frequency of the system is obviously reduced, and the average value of the third and fifth harmonics is increased from the initial 23. 35% and 12.35% dropped to 4.43% and 247% respectively, which suggests that SVC can obviously optimize the quality of traction network and is worth popularizing.