LOW PASS FILTER APPLIED IN THE CLOSED LOOP CONTROL STRATEGY FOR THE SUPERCAPACITOR ENERGY STORAGE SYSTEM INTEGRATED IN HYBRID WIND-DIESEL ISOLATED POWER SYSTEMS

Abstract

Diesel-based power generation is popular on an island (where located far from
the nation electrical grid). Wind energy is potential source contributed to remote
area power systems (RAPS) on islands. A possible solution to mitigate the wind
power fluctuations is integrated energy storage systems (ESS) to the wind turbine
(WT). The supercapacitor ESS (SCESS) is able to smooth out the output power of
wind turbine by exchanging bidirectional power between wind turbine and
supercapacitor through power conversion system. In order to reduce the impact
from these fluctuations a filter was implemented in the feed forward path of the
control system. This filter cuts off the unwanted high frequency fluctuations from
the output. Supercapacitor energy storage systems have the ability to stabilize grid
frequency in RAPS via controlled bidirectional active power exchanging process.
Simulations validate the effectiveness of the proposed control.