Research on Large-Scale Parallel Inter Harmonics Test of Broad Band and its Implementation

Multi-point inter-harmonic signal dynamic testing is the problem to electricity quality testing in the electric power substations and other sites. This paper proposes a test algorithm of whole band broadband and gives an implemented test and analysis system with master-slaver structural in the parallel test system. As collaborative platform the master engine software control all stations to realizes many functions, such as, the multi-channel synchronization within slaver, pulses synchronization between the slavers and remote GPS synchronization. Testing results show good performance. The DR is more than 109dB. The phase shift between channels is less than 0.12 degree. Using the guidelines given by the sliding window, recursive identification method of broadband in the whole frequency range can be calculated once all the inter harmonics parameters. is also used for power quality monitor in power system. The system may be served as a reference that requires dynamic monitoring system in parallel with inter-harmonic.