基于一种新型牵引补偿变压器的牵引变电群贯通供电系统负序补偿

Compensation of Interconnected Power Supply System of Traction Substation Group Based on a New Type of Traction Compensation Transformer

针对牵引变电所群贯通供电系统负序补偿问题,该文提出基于一种新型牵引补偿变压器与静止无功发生器的负序补偿方案和控制策略。研究牵引补偿变压器的拓扑结构和负序补偿方案,根据无功补偿单元的数目将补偿方案分为补偿模式Ⅰ、Ⅱ和Ⅲ。从牵引负荷电流有功分量和无功分量角度出发,分别定义负序和无功的约束因子,基于变压器磁动势平衡方程、端口接线方程和对称分量法等构建不同补偿模式下的负序与无功综合补偿数学模型。定义最大无功功率补偿量,将其作为确定补偿方案的依据。提出适用于负序补偿方案的电压和电流双闭环控制策略,通过仿真验证了补偿方案及控制策略的正确性和有效性。基于牵引变电所实测数据分析补偿方案的确定方法,结果表明,合适的补偿方案可以降低补偿装置容量。

Aiming at the negative sequence compensation problem of the interconnected power supply system of traction substation group,the scheme and control strategy for negative sequence compensation based on a new type of traction compensation transformer and static var generator are proposed.The topologies of the traction compensation transformer and the negative sequence compensation scheme are studied.The compensation scheme is divided into compensation modesⅠ,ⅡandⅢaccording to the number of reactive power compensation units.From the perspective of the active and reactive components of traction load current,the constraint factors of negative sequence and reactive power are defined respectively,and the mathematical models of negative sequence and reactive power comprehensive compensation under different compensation modes are constructed based on the transformer magnetic potential balance equation,port connection equation and symmetrical component method.The maximum reactive power compensation is defined as the basis to determine the compensation scheme.The double closed-loop control strategy of voltage and current for negative sequence compensation scheme is proposed,and the correctness and effectiveness of the compensation scheme and control strategy are verified by simulation.Based on the measured data of traction substation,the determination method of compensation scheme is analyzed,and the results show that appropriate compensation scheme can reduce the capacity of compensation device.