Research And Development Of The Valve Control Signal System In The High Voltage Direct Current Transmission

In this paper, it is established that the system's hardware design based on the analysis and research of the whole function of the valve control signal system of the High Voltage Direct Current Transmission (HVDC).The valve control signal system is divided into five functional modules, which are controller module, system monitoring module and interface circuit, firing-pulse transmitter module, indicating-pulse receiver module, alarm and sensitivity module. This article analyzes the main components used by functional modules and discusses how to choose them. In the process of circuit design, the means of hardware redundancy and the self-detection are used to improve the system reliability.This paper presents the analysis and research of the system's PCB (Printed Circuit Board) layout and route, the choices of power and ground layer, PCB impedance matching and signal integrity. In-depth discussion is made on the power and track width of the firing-pulse transmitter module.On the valve control signal system board which has been designed and implemented, the debugging of the FPGA(Field Programmable Gate Array) module, micro-controller and the FPGA communications, micro-controller and computer serial communication, firing-pulse transmitter module, alarm and sensitivity module, and indicating-pulse receiver module are completed. Finally, the system's hardware and software are combined together to debug; and the system reliability is tested.The valve control signal system board has passed through the valve control load experiment of strong electricity in laboratory.