Download Flexible Microgrid Power Quality Enhancement Using Adaptive

Flexible Microgrid Power Quality Enhancement
Using Adaptive Hybrid Voltage and Current
Controller
ABSTRACT
The application of nonlinear loads can lead to distribution system
harmonic pollutions. Harmonics voltages and currents in an electric power
system are a result of non-linear electric loads. Harmonic frequencies in the power
grid are a frequent cause of power quality problems. Harmonics in power systems
result in increased heating in the equipment and conductors, misfiring in variable
speed drives, and torque pulsations in motors.
Harmonics voltages and currents in an electric power system are a result
of non-linear electric loads. Harmonic frequencies in the power grid are a frequent
cause of power quality problems. Harmonics in power systems result in increased
heating in the equipment and conductors, misfiring in variable speed drives, and
torque pulsations in motors. Harmonics can lead to power system inefficiency.
Harmonics may affect plant equipment are listed below:
 Conductor Overheating.
 Capacitors: can be affected by heat rise increases due to power loss
 Fuses and Circuit Breakers: harmonics can cause false or spurious
operations and trips, damaging or blowing components for no apparent
reason.
 Transformers: have increased iron and copper losses or eddy currents due to
stray flux losses.
In this paper, a microgrid harmonic compensation strategy using
frequency adaptive HCM is proposed. At first, the conventional real power–
frequency droop control is replaced by a proportional and integral (PI) regulator
when the DG unit works in the grid-connected mode. Thus, accurate steady-state
real power control is achieved even when the microgrid frequency varies.
ADVANTAGES
 Both voltage and current control method can be implemented.
 It can eliminates the Harmonics
 There is no need for additional storage device like battery or capacitors.

.
Capacitor voltage will be ripple free