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In order to solve mode mixing, an improved HHT (IHHT) is proposed to identify modes of low frequency oscillation (LFO) in power systems. Firstly, by means of Fourier transform the approximate frequency range of every mode is determined; then methods such as masking signals or filters are chosen to separate mixing modes. Finally mode parameters can be calculated by linear least quadratic fitting. Simulated...
To assist dispatchers to on-line monitor small signal stability of power grid, this paper proposed an artificial intelligent method-Case-Based Reasoning(CBR) theory to predict small signal stability based on measurement data of wide area measurement system (WAMS). Oscillatory active power increment distribution (OAPID) was introduced to improve the prediction accuracy. The designing process of small...
This paper simplified the classical transient energy function based on center of inertia, improved the classical indicators of the stability margin, and put forward the indicator of the stability margin increment The indicator was established on the basis of the tie-line observational section in power system, and the calculation was simple and convenient, not only achieving early warnings of low frequency...
In this paper, robust control applications for damping power systems low frequency oscillations (LFOs) are reviewed and compared, to reveal new research directions. With the analysis of LFO through the application of a single-machine infinite-bus (SMIB) model, design methods for Power System Stabilizers (PSSs) can generally be classified into three categories, H∞ control, H2 control, and mixed H∞/H...
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