This paper presents an adaptive sliding mode control
(ASMC) of an improved power quality standalone single phase
microgrid system. The proposed microgrid system integrates a
governor-less micro-hydro turbine driven single- phase two
winding self-excited induction generator (SEIG) with a wind
driven permanent magnet brushless DC (PMBLDC) generator,
solar photo-voltaic (PV) array and a battery energy storage
system (BESS). These renewable energy sources are integrated
using only one single-phase voltage source converter (VSC). The
ASMC based control algorithm is used to estimate the reference
source current which controls the single-phase VSC and
regulates the voltage and frequency of the microgrid in addition
to harmonics current mitigation. The proposed ASMC estimates
the reference real and reactive powers of the system, which is
adaptive to the fluctuating loads. The sliding mode control is
used to estimate the reference real power of the system to
maintain the energy balance among wind, micro-hydro, solar PV
power and BESS, which controls the frequency of standalone
microgrid. The proposed microgrid is implemented in real time
using a DSP (Digital Signal Processor) controller. Test results of
proposed microgrid shows that the grid voltage and frequency are
maintained constant while the system is following a sudden
change in loads and under intermittent penetration of wind and
solar energy sources.
Fractional Order Sliding Mode Control Design for a Buck Converter Feeding Resistive Power Loads
