Modified on-line detection technology of harmonics in power system

When we analysis signal by FFT arithmetic, single chip needs too much time to calculate and we can´t detect power quality real time, and the sampling rate must synchronize the signal frequency. When sample multi-channel signal in turn, it must have time delay between two samplings, so the phase angle difference between each channel signal is can´t be avoid and so on. Those problems must be solved. Longing to solving some of those problems, we took some new ideas. Tests have proved that this equipment can satisfy the requirement of international standards about harmonic detection. Furthermore the design of hardware can reduce the computation period. It is very benefit to real-time monitor.