高压断路器是电力系统中最重要的控制和保护设备。操动机构是高压断路器进行分合闸动作的机械操动装置，实现断路器动触头的分合闸操作，达到开断与关合电路的目的。本论文主要研究了一种新型断路器操动机构。它是通过电力电子技术和电动机DSP数字控制的由永磁同步电动机驱动的高压断路器操动机构。这种操动机构与传统的操动机构相比，不需要额外传感器的情况下，即可以实现连续的自检和监测等功能，适用于SF6断路器等多种断路器，具有比较广泛的应用前景。本论文分析高压断路器在分闸操作过程中，动触头的行程、速度与电动机负载转矩、负载功率的关系，推导了电动机负载转矩和负载功率关于断路器分闸速度的数学表达式，通过Matlab/Simulink建立了电动机操动机构运动模型，绘出了转矩、功率的曲线，给出了高压断路器在进行分闸操作时对电动机参数的要求，为选择合适的电动机提供了依据。通过对各种电动机的性能对比分析，选择了永磁同步电动机作为本论文高压断路器电动机操动机构的驱动电机。本论文设计和实现了一个以数字信号处理器TMS320LF2407A为核心的永磁同步电动机操动机构的硬件系统，对电动机转子位置信号与转速信号的检测、电动机DSP控制系统进行了详细的阐述。在分析研究了永磁同步电动机矢量控制的基础上，建立了一套高压断路器电动机操动机构控制系统的控制方案。在本控制系统中，永磁同步电动机采用 的矢量控制策略，实现了对电动机转速和电流的闭环控制，使控制系统具有良好的动态性能。本论文对永磁同步电动机操动机构进行了分闸操作的仿真计算，以及在分闸操作时间是60ms、50ms、40ms和30ms情况下的电动机操动机构空载和负载实验。电动机操动机构在完成60ms、50ms分闸时间的操作时，分闸性能良好，空载和负载行程曲线基本相同，达到设计性能的要求。分析了在分闸时间是40ms、30ms的情况下，电动机参数对分闸操作性能的影响。为以后进一步改善电动机操动机构的分闸特性，提供了参考。关键词：永磁同步电动机 操动机构 高压断路器 数字信号处理器Matlab/Simulink
High voltage circuit-breaker (HVCB) is the very important switch apparatus in electric power systems. It is responsible to control and protect the power systems. The operating mechanism is the basic device which controls the opening and closing operations of HVCB. This paper describes a new type of operating mechanism driven by a three-phase Permanent Magnet Synchronous Motor (PMSM) for high voltage circuit-breaker through power electrical technology and digital signal processing. Compared with conventional operating mechanisms, the operating mechanism driven by the motor is fully electronic and has features such as continuous self-monitoring, monitoring of timing, etc., without the need of for additional transducers. It has a wide range of application, can be used in SF6 circuit breakers and so on.This paper analyzes the relationship between the moving contact travel, velocity of HVCB and PMSM torque, power; and deduces the mathematical expression of PMSM torque on the velocity of opening operation. By simulating and calculating the model of PMSM operating mechanism with Matlab/Simulink, it proposes the main parameters and requirements of PMSM.This paper designs and realizes a servo control hardware system of PMSM operating mechanism via the digital signal processor TMS320LF2407A. Based on the research of PMSM vector control, it presents a design scheme of the PMSM operating mechanism for HVCB. In this system PMSM is applied the control through the DSP software. It provides the system a good dynamic performance by closed loop controls of the rotating speed and current. This paper calculates the opening operation of PMSM operating mechanism, and makes no-load and load experiments in different times of opening operation. PMSM operating mechanism has a good performance under the given opening time, and the two travel curves of no-load and load are quite similar. It reaches the design requirements. It analyzes effects to the opening operations caused by the parameters of PMSM when the opening time is short. This provides a reference to improve the characteristic of the opening operations for PMSM operating mechanism.Keyword: Permanent Magnetic Synchronous Motor，High Voltage Circuit-Breakers，Operating Mechanism, Digital Signal Processor, Matlab/Simulink
