基于信号小波预处理的继电保护仿真实验平台

针对传统继电保护教学实验仪器功能单一、造价昂贵等常见问题,设计了基于计算机MATLAB软件和数模转换输出硬件系统的继电保护仿真实验平台。依靠MATALB强大的仿真运算和程序处理功能,通过高性能的数/模(digital/analog,D/A)转换模块和功率放大电路,将灵活的电网模型仿真模拟量传送到待测继电保护设备中,并将设备动作信号收集并反馈;为解决仿真算法引入的系统外部误差,设计了基于小波理论的信号重构方法,使信号稳定的进行转换和输出。通过仿真实验对比,在消除解法器引入的误差时,所提方法明显优于常用滤波方法。最后通过实际微机保护测试实验验证了该实验平台的可行性。

Relay Protection Simulation Experiment Platform Based on Signal Wavelet Preprocessing

In order to solve the common problems such as the single function and high cost of traditional relay protection teaching experiment instrument, a relay protection simulation experiment platform based on computer MATLAB software and digital to analog conversion output hardware system was designed. Relying on MATALB"s powerful simulation operation and program processing functions, through the high-performance DA conversion module and power amplifier circuit, the flexible power network model simulation quantity is transmitted to the relay protection equipment to be tested, and the equipment action signal is collected and fed back. In order to solve the external errors of system introduced by the simulation algorithm, a signal reconstruction method based on wavelet theory is designed to make the signal transform and output stably. Through the comparison of simulation experiments, the proposed method is obviously superior to the common filtering method in eliminating the error introduced by the solver. Finally, the feasibility of the experimental platform is verified by the actual microcomputer protection test experiment.