The presentedpaper illustrates the invasive method of power-system identification. It is based on Czarnecki's ideas to disturb slightly the system and observe its response to find unknown harmonic sources and equivalent linear impedances. The one-phase system is considered, with a new signal-processing technique in which instant measurements are based only on two adjacent signal periods. That approach allowed to move differential calculations to the time domain, and to deal with integral Fourier transform, in place of discrete, in frequency domain. The new algorithm allows to increase the S/N ratio, is insensitive to signal time-shifts and gives correct results in a wide frequency band (5 kHz). Simulation and rneasurements results are presented and show how accurate the identification can be f o r short-time (two periods) and 1 s long observations.
The paper shows that it is possible to design such a switched 1 ‐port which ‐ excited by a sinusoidal voltage ‐draws desired current harmonics. The circuit switched twice within a period can generate odd current harmonics and the circuit switched once within a period generates even harmonics. This new kind of compensator has advantages of active filters such as good compensation characteristics. On the other hand it is easier to realize a large VA compensator based on the presented idea than to realize a high switching frequency static power compensator. Most established active and hybrid filters are based on a load current measurement. The compensator presented in the paper can be used to eliminate current distortion as well as voltage distortion. The two‐step optimization with the use of the harmonic voltage measurement allows to eliminate harmonic voltage. The results of numerical simulation and experimental results are presented.
SUMMARYRealizability conditions of periodic waveforms in passive switched circuits are presented. Formulae for an identification of state matrices in switched circuits are derived. As input data, time functions of excitation and response are chosen. Six general transformer structures of 1-port thyristor converters have been obtained as a result of the synthesis method. The synthesis methods presented can be applied to create new thyristor and transistor arrangements, particularly thyristor compensators.
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