  This paper describes a method to implement Reactive Power Compensation (RPC)
in power systems that possess nonlinear non-stationary current disturbances.
The Empirical Mode Decomposition (EMD) introduced in the Hilbert-Huang
Transform (HHT) is used to separate the disturbances from the original current
waveform. These disturbances are subsequently removed. Following that, Power
Factor Correction (PFC) based on the well-known p-q power theory is conducted
to remove the reactive power. Both operations were implemented in a shunt
Active Power Filter (APF). The EMD significantly simplifies the singulation and
the removal of the current disturbances. This helps to effectively identify the
fundamental current waveform. Hence, it simplifies the implementation of RPC on
nonlinear non-stationary power systems.
