In order to solve the problem of three-phase voltage unbalance at the point of common coupling on the power system side caused by the negative sequence of tree bilateral interconnected power supply system,this paper proposes a negative sequence compensation scheme for power transfer by installing a compensation device composed of the step-down transformer,the power flow controller(PFC)and the controller in the tree bilateral interconnected power supply system.On the basis of establishing the topology and mathematical model of the interconnected traction power supply system using PFC,reasonable constraint parameters and control strategies are designed to control the compensation device to change the power distribution on the power system side to achieve negative sequence compensation.The MATLAB/Simulink simulation test platform is used to analyze the variation law of the required capacity of the compensation device with the degree of the negative sequence compensation,and the minimum negative sequence compensation capacity is calculated to verify the compensation scheme.The results show that the negative sequence compensation scheme based on power transfer can flexibly adjust the negative sequence power and reactive power content at the point of common coupling.The maximum value of three-phase voltage unbalance at the point of common coupling can be reduced to 4％,and 95％statistical value can be reduced to 2％,which meets the national standard and verifies the effectiveness of the negative sequence compensation scheme based on power transfer.
关键词
牵引供电系统/贯通供电/负序补偿/无功补偿/潮流控制器
Key words
Traction power supply system/Interconnected power supply/Negative sequence compensation/Reactive power compensation/Power flow controller
维普
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