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As a non-linear and time-varying tool, Hilbert-Huang Transform (HHT) has been widely used to analyze Low Frequency Oscillation (LFO) signals in power systems. It utilizes Empirical Mode Decomposition (EMD) to decompose the LFO signals into a collection of Intrinsic Mode Functions (IMFs), and then the instantaneous parameters including magnitude, frequency of every IMF can be calculated by applying...
This paper presents a parallel particle swarm optimisation (PPSO) approach for solving the distributed optimal reactive power dispatch (ORPD) problem. The proposed method is a combination of parallel computation based on message passing interface (MPI) and particle swarm optimisation algorithm. After dividing a large scale power system into a group of small subsystems, ORPD problem of each subsystem...
Microgrids are systems with clusters of microgenerators, which are installed for distributed power generation. When interfaced to the utility grid, microgrids are exposed to common utility power-quality disturbances. In particular, during utility-voltage sags, large line currents can flow along distribution feeders connecting the micro- and utility grids. To limit this flow of large line currents...
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