Zhuzhou Crrc Times Electric Co., Ltd

Csr Zhuzhou Electric Locomotive Research Institute Co., Ltd.

Crrc Zhuzhou Electric Locomotive Research Institute Co., Ltd.

Kean Liu

Jing Shang

Jianghua Feng

Xiong Liu

Junfeng Xu

Yuliang Wen

Yaping He

Chaoyang Zhang

Lei Xiao

Shaolong Xu

Jun Tang

Hao Li

Jun Yang

Hanfeng Zheng

Wei Guo

Liangjie Liu

Yonghui Nan

Guotao Jiang

Siyuan Li

Qing Xu

Qinyang Luo

Yan Xiong

Fan Jiang

Yu Wang

Chao Du

Qiao He

Bingzhang Li

Leilei Ding

Lifen Yang

Gengliang He

Jinwei Mo

Xuebiao Peng

Chaoyong Lin

Fang Yuan

Weiwei Gan

Qingliang Zhao

Minggao Zeng

Huadong Liu

The invention relates to an information security protection method and apparatus, and a computer-readable storage medium. The information security protection method comprises the steps of: allocating a train control and monitoring system to an intranet region, and performing region boundary security protection on the train control and monitoring system; performing communication network security protection on the train control and monitoring system; and performing terminal device security protection on the train control and monitoring system. The invention deeply integrates an application service of a train control and monitoring system, and defence-in-depth is performed on the train control and monitoring system from a plurality of dimensions such as region boundary security, communication network security and terminal device security, such that attacks initiated from an intranet and an extranet of the system can be effectively handled, and thus, the information security protection capability of the train control and monitoring system is improved.

Information security protection method and apparatus

Provided are a method and system for controlling a voltage. The method includes: acquiring a current output voltage of an inverter; calculating a current voltage error of the current output voltage relative to a given output voltage; inputting the current voltage error into a fuzzy controller to determine a target output voltage of the inverter; determining an amplitude adjustment command based on a difference between an amplitude of the target output voltage and an amplitude of the current output voltage; determining a phase adjustment command based on a difference between a phase of the target output voltage and a phase of the current output voltage; and adjusting an amplitude and a phase of an output voltage of the inverter according to the amplitude adjustment command and the phase adjustment command respectively, to maintain the output voltage of the inverter within a preset range.

Voltage control method and system

A control method for restarting a permanent magnet synchronous motor (PMSM) in a rotating condition, and a device and a system thereof are provided. In the method, an electrical angular speed &#x3c9;of the PMSM is obtained based on a speed of a trailer to obtain a back electromotive force of the PMSM. The back electromotive force is compared with a voltage at a side of an inverter, and if the electromotive force of the permanent magnet synchronous motor is higher than the voltage at the side of the inverter, the restarting of the PMSM is forbidden, otherwise, the restarting of the PMSM is allowed. Therefore, in the present disclosure, the low-speed operating condition and the high-speed operating condition correspond to different position angles of the rotor, and the PMSM is started based on the position angle of the rotor.

Control method for restarting permanent magnet synchronous motor with speed, device and system thereof

A direct-axis current protection method and device for a permanent magnet synchronous motor drive system. The method includes: pre-calculating the direct-axis current of the next moment according to the current voltage transmitted from an inverter to a permanent magnet synchronous motor (PMSM); comparing the direct-axis current of the next moment with a maximum protection current; if the direct-axis current of the next moment is less than the maximum protection current, continuing transmitting the current voltage to the PMSM; if the direct axis current of the next moment is greater than or equal to the maximum protection current, redistributing the voltage according to a protection direct-axis current and a protection quadrature-axis current, and transmitting the redistributed voltage to the PMSM. The direct-axis current of the next moment is tended to be normal by adjusting the voltage.

Direct-axis current protection method and device for permanent magnet synchronous motor drive system

A method and device for acquiring a rotor position based on a permanent magnet synchronous drive system. The permanent magnet synchronous drive system includes an inverter and a permanent magnet synchronous motor, wherein the initial speed of the permanent magnet synchronous motor is not zero. The method includes: controlling a bridge arm switch of an inverter periodically; collecting a three-phase current of the permanent magnet synchronous motor at a fixed time within each control period; and after the three-phase current is reversed, sending same to a phase-locked loop system to conduct processing, so as to obtain a phase angle of an induction potential vector, and according to the phase angle of the induction potential vector, acquiring a rotor position angle of the permanent magnet synchronous motor.

Method and device for acquiring rotor position based on permanent magnet synchronous drive system

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Hunan, China

Kean Liu