The system for testing electrical performance of power generating sets based on technique of AC sampling

A multilevel distributed system for testing electrical performance of power generating sets based on CAN bus is presented. Sampling and control for electrical parameters are realized utilizing Digital Signal Processor (DSP) and sixteen-bit Microcontroller Unit (MCU) that M16C/6N of renesas, an intelligent load based on the MCU of AT89S52 is designed, of which value can change automatically according to the need of testing, remote real-time supervision and integrated analysis for the electrical parameters are realized by Industrial Personal Computer (IPC) and configuration control software. A synchronous AC sampling algorithm based on Discrete Fourier Transform (DFT) is presented, and sampling precision is improved by tracing the frequency of signal under test using the method of “three points”. It indicates that the system is characterized by flexible configuration, high precision and high reliability in practical application.