RPC的直接补偿控制技术研究

Research on the Direct Compensation Control Method of RPC

为了减少电气化铁路对公共电网的负序污染,通常会在牵引变安装RPC等电力电子补偿装置。理论上对于采用Scott变压器的牵引变压,两个低压侧的等效有功和无功功率相等时,高压侧注入电网的负序电流为零。此外利用RPC的剩余容量也可以达到补偿无功的效果。但是这是一种间接的补偿控制方式,受实际参数偏差的影响,补偿效果并不理想。文章提出了一种直接补偿控制的方法,以变压器高压侧的电气量为跟踪量,实现闭环控制,达到更优的补偿效果,并进行了仿真验证。

The power electronics based equipment like the RPC is often installed in traction substations in order to re- duce the negative sequence effect of the electrified railway on the public power grid. In theory, for the traction substa- tion with Scott transformers, when the equivalent power and the reactive power on the two low-voltage sides are equal, the negative sequence current injected into the power grid from the high-voltage side will be zero. Besides, use of the residual capacity from the RPC can also achieve the purpose of reactive power compensation. But this indirect compen- sation control method is not very effective due to the effect of the actual parameter deviation. Therefore, a direct com- pensation control method was proposed in this paper, which tracked down the electrical quantities on the high-voltage coil terminal of the transformer. This direct control method had a closed-loop structure, so it could achieve a better control effect. The validity and effectiveness of the method were verified by the simulations.