输电线阻波器、滤波器特性的DSP测试系统

Test System of Measuring Characteristics of the Wave Trap Coil and Coupling Filter by the DSP Technology

为解决现有电力载波通信系统中线路阻波器、结合滤波器的性能测试方法中存在的问题,提出了一种集自动测试、高速采样和数据处理于一体的新型智能式测试系统方案。在介绍了基于快速傅立叶变换算法的测试系统设计原理后详述了测试系统的软、硬件实现方案,即用数字频率合成技术产生正弦波激励信号,采用高速模数转换器转换技术采集数据,并通过数字信号处理算法处理数据,以大大提高系统的测量精度和稳定性。采用Matlab对典型带宽阻波器电路法仿真证明该法准确有效,系统方案能较好地抑制谐波,微机化的管理使得操作方便灵活。

The measurement and examination of wave trap coil and coupling filter used for power line carrier communication system are an important part to ensure the electric power system operating normally.To solve the problems of the conventional methods,a novel testing system which contains following automatic testing functions,such as high-speed acquisition and data process, is designed.According to the design principle of the test system based on FFT calculation way,the Matlab is adopted in the typical model bandwidth power wave trap coil circuit to calculate and to imitate the reality,and the usefulness and the accuracy of this method are discussed.The scheme of the software and hardware is introduced.The digital technologies such as DDS are utilized to generate the sine-wave stimulating signal,the high-speed sampling technology is utilized to realize data acquisition and DSP algorithm is utilized to process the data while designing the system.The experimental results show that the measurement accuracy and stability are improved greatly.This test system can effectively repress harmonic,and the computer management makes the operation convenient and vivid.