A novel integrated power quality controller for microgrid

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A Novel Integrated Power Quality Controller
for Microgrid
Abstract
Introduction:
Distributed power generation has been emerged as a
promising option to meet the growing customer needs for
electric power with an emphasis on reliability and
environmentally friendly renewable energy. In this context, in
order to maximize the operational efficiency of the distributed
energy resources (DERs) and take full advantage of distributed
power generation, as an effective means of integrating DERs
into the traditional power grid, microgrid is presented, which
can enhance the local customer power supply reliability and
system performance, reduce the impact on large power grid, and
minimize the system losses. Microgrid has good environmental
and economical benefits and has attracted more and more
attentions of power researchers. However, the power quality
problem of microgrid is much more serious than that of the
traditional grid because of the intermittency and randomness of
DERs, the high penetration between conventional grid and
microgrid, the diversity of DERs, load, energy conversion unit,
storage, and operating state. Microgrid power quality has the
following unique features compared with the conventional
power grid.

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Existing system:
This method employs an integrator with reset as its core
component to control the pulse width of an ac–dc converter so
that its current draw is precisely opposite to the reactive and
harmonic current draw of the nonlinear loads. In contrast to all
previously proposed methods, there is no need to generate a
current reference for the control of the converter current, thus no
need to sense the ac line voltage, the APF current, and the
nonlinear load current. Only one current sensor and one voltage
sensor (resister divider) are used to sense the ac main current
and the voltage across the dc capacitor. The control method
features constant switching frequency operation, minimum
reactive and harmonic current generation, and simple analog
circuitry. It provides a low cost and high performance solution
for power quality control. Steady-state and dynamic analysis is
performed that leads to the remedy of the dc offset related to
peak current sensing and extension of the stability region.
Proposed system:
The novel IPQC can be installed in series and parallel in
microgrid or point of common coupling (PCC). For simplicity,
the IPQC is installed in PCC. The three-phase detailed system
configuration of the IPQC with transformer and inverter. Us and
Ls represent the source voltage and impedance of conventional

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power supply, respectively. The passive filters, which have the
function of absorbing the harmonics, are shunted in both sides.
The primary winding of a transformer is inserted in series
between the conventional power utility and the microgrid,
whereas the secondary winding is connected with a voltage-
source PWM converter. Ud is the voltage of the dc side of the
inverter. The microgrid contains a harmonic load, a photovoltaic
cell system, a battery storage system, and a normal load.
Block diagram:

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Passive
filters Load
Non linear
Load
Voltage
source
inverter
Input DC
supply
Filter
Filter
BUFFER
circuit
5VDC
PIC controller
circuit
3 phase driver circuit12 V DC
Voltage
source
inverter
Voltage
source
inverter
Input source 1
Input source 2

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Tools and software used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.

A novel integrated power quality controller for microgrid

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