基于单相双旋转移相变压器的高速铁路系统负序补偿方法  

Single-Phase Dual Rotary Phase Shifting Transformer Based Negative Sequence Compensation Method for High-Speed Railway Systems

作　　者：颜湘武[1] 李秉桢 吴炜林 邵晨 彭维锋 Yan Xiangwu;Li Bingzhen;Wu Weilin;Shao Chen;Peng Weifeng(Hebei Provincal Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University,Baoding 071003 China)

机构地区：[1]华北电力大学河北省分布式储能与微网重点实验室,保定071003

出　　处：《电工技术学报》2024年第15期4643-4653,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52207102)。

摘　　要：针对高速铁路供电系统在高压电网引起的负序问题,该文参考旋转潮流控制器(RPFC)和静止无功补偿器(SVG)结构,提出一种基于单相双旋转移相变压器(S-DRPST)的新型负序补偿拓扑。首先,分析S-DRPST的工作原理并建立其稳态电压源模型。其次,在V/x牵引供电系统应用场景下,提出S-DRPST的负序电流补偿方法,即根据供电臂负载功率计算所需补偿电流表达式,进而得到两台S-DRPST输出电压幅值与相位,通过调节移相角大小实现电网侧电流的平衡。在此基础上,对单台S-DRPST移相角控制进行设计,补偿设备投入前利用柔性合环减小对牵引网的冲击,投入后采取移相角协调变速控制,使得移相角在接近设定值时降低转速,同时根据角度偏差协调转速控制,从而抑制输出电压振荡现象。最后,利用Matlab/Simulink软件搭建牵引供电系统进行仿真验证,在合环场景下将S-DRPST柔性投入牵引网,仅a相供电臂带负载的情况下,电压不平衡度从4.81%降低到了0.05%,在计及供电臂制动状态时不同工况的不平衡电压均被控制在0.1%以下,在牵引负载快速连续变化下S-DRPST能及时响应补偿负序电流,结果表明S-DRPST在高速铁路供电系统中具有良好的负序补偿效果。The AC-DC-AC electric locomotive with four-quadrant pulse width modulation(PWM)control is gradually becoming the main type.Compared with traditional AC-DC electric locomotives,it alleviates reactive power and low-order harmonic problems of electrified railways.However,the increase in traction power exacerbates the negative sequence problem of the power grid.Therefore,referring to the structure of the rotary power flow controller(RPFC)and static var generator(SVG),a new negative-sequence compensation topology based on a single-phase dual rotary phase shifting transformer(S-DRPST)is proposed to suppress the unbalanced currents caused by traction loads on the grid side.Firstly,S-DRPST is mainly composed of two single-phase rotary phase shifting transformers,which change the phase angle between the stator and rotor voltages by driving the S-RPST to rotate through a servo motor.The secondary side combines the two stator voltage vectors to form the output voltage of S-DRPST in series with the line,and changing the amplitude and phase of the output voltage can effectively control the line current of S-DRPST.Then,the S-DRPST negative sequence compensation strategy is studied in the application scenario of V/x traction power supply system.Considering the traction and braking states of the electric train load,the amplitude and phase of the output voltage of two S-DRPSTs are calculated based on the power of the supply arm,and then the set value of the phase shift angle is obtained.At the same time,the phase shift angle control of a single S-DRPST is designed using flexible coupling before the compensation equipment is put into operation.After the equipment is put into operation,the coordinated variable-speed control for phase shift angle is adopted to suppress the output voltage oscillations.Finally,a simulation model of the high-speed railway power supply system is established to verify the proposed S-DRPST topology and control strategy.The results show that the S-DRPST in the closed-loop scenario can flexibly reduce the i

关 键 词：高速铁路供电系统 单相双旋转移相变压器 负序电流补偿 移相角控制 

分 类 号：TM922[电气工程—电力电子与电力传动]