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附件一:英文资料 New DSP Method for Investigating Dynamic Behavior of Power Systems Center for Technological Education affiliated with Tel Aviv University Electricity and Electronics Dept. 52 Golomb St., 58102 Holon, Israel The most important characteristic of a Power Systembehavior is the variable fundamental frequency, also called the actual or instantaneous frequency. Its accurate estimation and interpretation is a challenging theoretical and practical problem that still is not solved after many years. The actual power-line frequency deviation from its stationary value is a measure of imbalance between the load and generation in a Power System. Generally, there are the average drift of the actual system frequency and the superimposed frequency oscillations. In a compact Power System, the average behavior of frequency is dominant, but its oscillations are also important from the viewpoint of power supply quality and its inuence on precise measuring instruments, as well as system stability, its testing, and diagnostics. Regular power-line frequency variations are within the 0.01%–0.1% range, but sometimes, under emergency conditions, they may reach 1%–2% or more. Regular rate of change of the actual power-line frequency is about 0.1–0.5 Hz/ s, but in emergency transients it may reach 5 Hz/ s or moreSeveral DSP methods are used in tracking and estimating the actual power-line frequency: the Discrete and Fast Fourier Transforms (DFT, FFT) of the actual power line voltage based mainly on synchronous sampling and phasor measurements; the regular and improved Kalman filtering; Least Square Error (LSE) technique; the bilinear form approach and the Newton iterative procedure; orthogonal component decomposition technique;etc. The DSP methods based on phasor measurements are mainly used in protective relays, including multifunction relays, with built-in microprocessors and PC-based boards for DSP, Data Acquisition, and communication. The main disadvantage of these methods i
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