The invention discloses an electric locomotive and a power supply system and a network side overvoltage suppression method thereof. The system comprises a control unit, a first voltage detector, and a traction power supply network, a traction transformer, a rectifier unit, an intermediate direct current link, an inverter unit and a traction motor which are connected in sequence, the first voltage detector, the rectifier unit and the inverter unit are respectively connected with the control unit; the first voltage detector is used for detecting network side voltage; when the locomotive is in an electric braking working condition and the network side voltage is greater than the set maximum limit voltage, the control unit blocks a power switch tube of the inverter unit, and meanwhile, the set reference value of the intermediate direct current link is improved, so that the energy flow is changed from the traction power supply network to the intermediate direct current link, and the network side energy is consumed; and the suppression of the grid-side overvoltage is realized.
本发明公开了一种电力机车及其供电系统、网侧过电压抑制方法,所述系统包括控制单元,第一电压检测器以及依次连接的牵引供电网、牵引变压器、整流器单元、中间直流环节、逆变器单元和牵引电机;第一电压检测器、整流器单元以及逆变器单元分别与控制单元连接;第一电压检测器用于检测网侧电压;当机车处于电制动工况且网侧电压大于设定的最大限制电压时,控制单元封锁逆变器单元的功率开关管,同时提高中间直流环节的设定参考值,使能量流向变为从牵引供电网到中间直流环节,从而使网侧能量被消耗,实现了网侧过电压的抑制。
Electric locomotive, power supply system thereof and grid-side overvoltage suppression method
电力机车及其供电系统、网侧过电压抑制方法
2023-12-01
Patent
Electronic Resource
Chinese
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