Power quality measurements using general purpose data acquisition systems vs. dedicated PQ analyzers

Mechanism of sub‐synchronous interaction caused by inter‐harmonics in DFIG

“…Literature [3] points out voltage fluctuation and inter‐harmonics in distribution network are related, the fluctuations in the voltage source will result in abundant inter‐harmonics in the current. It is revealed in [4] that the inter‐harmonics will affect the data acquisition, and then interfere with the relay protection device, seriously may even cause the protective device misoperation. Another major hazard is may result in the sub‐synchronous oscillation (SSO) of the system.…”

Estimator–analyzer of power quality: Part II – Hardware and research results

“…Basically, they are based on PCs equipped with a data acquisition board (DAQ) and appropriate software or they are dedicated devices equipped with a digital signal processor (DSP). Both solutions have been investigated for quite a few years [1][2][3][4][5][6][7]. In short, the merits of PC-based solutions are: easily accessible software, ample data storage capacity and the possibility of modification of the algorithm by the device user.…”

Embracing advance information technology in power quality monitoring

“…Interface to the GPS (Global Position System) that provides accurate time information, is one example of such benefits. Therefore, PC-based platforms with general-purpose DAQ and improved microprocessor are now comparable to dedicated systems in the quest to design high-performance power quality monitoring units [8]. A prototype PC-based power quality-monitoring unit using general-purpose DAQ has been constructed and proven to fulfill all of the necessary performance requirements [9].…”

“…Each unit is an industrial grade Pentium-based PC with a general-purpose DAQ card and corresponding transducers and signal-conditioning units [8]. They are programmed in C++ as CORBA objects making them accessible from the J2EE environment.…”