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The real-time on-line estimation of phasor frequency, amplitude and phase Angle makes a high request on both the accuracy and real-time of the method. In the conventional phasor measuring method based on DFT (discrete Fourier transform), data acquisition cycle was longer, the accuracy was easy to be effected by the frequency fluctuation. On the other hand, while the systems are under unbalanced operation...
In this paper, carrier based islanding protection is taken as the research objects, and the signal injection equipment and the islanding protection equipment are designed to implement the protection. First, it makes demands on signal injection equipment, and chooses proper signal injection mode, signal frequency and signal source according to the demands; then, it makes demands on islanding protection...
Simulation accuracy has great effects on power system analysis and control. In this paper, in order to analyze the power system real-time digital simulation error, prony algorithm is used to extract the features of signal. Based on the analysis results of this algorithm, residual similar index was used to characterize the global error of simulation, and then frequency, damping and amplitude similar...
Phasor measurement unit (PMU) is an emerging measurement technology for power grids which enables the synchronised high speed measurement with precise time stamps for accurate system comparison over a wide geographic area. PMU measurement quality is the key issue in application purposes. To evaluate the measurement quality, the concepts of total vector error (TVE) and benchmark tests, including the...
The concept of a power system synchronized phasor was introduced in the 1980s and standardized for the first time with the standard IEEE 1344. The measurement concept was further refined in the current synchrophasor standard, IEEE C37.118, completed and published in 2005. It is currently undergoing revision to fully define the measurement in all conditions including dynamic changes in the power system...
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