power factor correction for wind and solar system

A
Project review on
Design and Implementation of Power Converters for both PV Solar Cells
and Wind Generator and with Three Phase Power Factor Correction
Bit Institute of Technology
Dept. of EEE
Batch No:07
3/26/2015
BIT INSTITUTE OF TECHNOLOGY ,HINDUPUR.
1
NAME REG.NO
P.RAGHUNATHA REDDY 11F31A0220
N.AJAY KUMAR 11F31A0201
K.BHARATH REDDY 11F31A0203
G.HARISH 11F31A0210
Under the Guidance of
C.Viswanath M.Tech
Assoc. Professor

CONTENTS
3/26/2015BIT INSTITUTE OF TECHNOLOGY ,HINDUPUR.
2
 Abstract
 Introduction
I. Solar cells or Photovoltaic (PV) Cells
II. Wind turbines
According to type of blades
1.Horizontal axis
2.Vertical axis
According to type of generator
1.DFIG
2.PMSG
 Topologies of the circuit
 Control Strategy
 Experimental results
 Conclusion

Abstract
Implementation of power converter for both PV solar cells and wind generator
controlled by digital signal processor . It is composed of a PV solar cells ,wind
generator, lead-acid batteries, a three phase ac/dc full-bridge semi
controlled boost rectifier, a dc/dc single-ended primary inductance converter
(SEPIC), a bi-directional converter and a full-bridge inverter. The wind
generator is used as the main power source. Lead-acid batteries as the
auxiliary power source. It adopts power factor correction to achieve unit
power factor and maximum power point tracking (MPPT) to implement
available maximum power. The bidirectional converter provides charging and
discharging compensation to dc bus by controlling the duty cycle of switches.
The full-bridge inverter produces a stable ac output with feedback.
3

4
● A solar cell or photovoltaic cell, is an electrical device that
converts the energy of light directly into electricity by
the photovoltaic effect.
● It is a form of photoelectric cell, defined as a device whose
electrical characteristics, such as current, voltage, or resistance,
vary when exposed to light.
● Solar cells are the building blocks of photovoltaic modules,
otherwise known as solar panels.
Solar cell or Photovoltaic (PV) Cells

According to the types of Blades
The Wind Generators are classified into two types
1.Horizontal axis turbine
a.Propeller type b.Multi-blade type
c.Dutch type d. Windsurfing type
5

2.Vertical axis turbine
a.eurowind type b.darrieus type

c.Savonius type d.Drag type
6

The graph of the power factor versus the tip speed ratio (TSR) of horizontal axis in different
number of blades, and it can be observed that the performance of the three-blade is better.
7
Figure . Number of different blades versus tip speed ratio of horizontal axis turbine
Number of different blades versus tip speed ratio of
horizontal axis turbine

According to the types of Wind Generator
Doubly Fed Induction
Generator
Permanent Magnet
Synchronous Generator
8
Requires additional magnetizing current
DFIG decides the frequency and voltage
by magnetizing current,
The system requires a gearbox between
the wind turbine and the generator in
order to reduce the number of poles of
DFIG.
Not only increases volume and cost but
also reduces the efficiency and reliability.
Requires no magnetizing current.
Voltage and current does not depends on
magnetizing current
No presence of gear box
Compared to DFIG PMSG has less volume
,low cost and high efficiency and has more
reliability

Topology of the Circuit
 The currents corresponding to the
inductors (L1, L2, L3) are increase when
the switches (S1, S2, S3) are turned on.
 The corresponding diodes (D1, D2, D3)
conduct when the switches (S1, S2, S3)
are turned off.
9
Figure. Topologies of the proposed system.

Control strategy
10
 To increase the stability and the
output efficiency, the semicontrolled
rectifier is adopted.
 The proposed control method
implements the quasi-synchronous
rectification (QSR) with PWM to
make the voltage and current in the
same phase.
 fig shows topologies of the
semicontrolled rectifier.
Figure The schematic diagram of digital controller of semi controlled rectifier
The schematic diagram of digital controller of semi controlled rectifier

MATLAB Circuit Diagram
11
Fig MATLAB Circuit Diagram

Solar PV cells output voltage and currents waveforms
12

The instantaneous waveform at the startup of the wind generator
(perturbation and observation method, 250W)
13
Figure. The instantaneous waveform at the startup of the wind generator (perturbation and observation method, 250W).

The instantaneous waveform of bi-directional converter
14
Figure . The instantaneous waveform of bi-directional converter.

SEPIC input and output currents characteristics:
15

SEPIC input and output voltage characteristics
16

The instantaneous voltage and current of variable load
under high voltage
17

CONCLUSION
18
The implementation of power conversion system (220W) for both PV solar cells and wind
generator is presented in this paper. In the control strategy, the system achieves high stability
and available maximum power point by using quasi-synchronous rectification and P&O
method. With the proper control of the wind generator, the output power will be balanced
effectively. A dc bus hysteresis detection mechanism is designed to control the battery;
therefore, the power flow between the battery and the dc bus can be controlled. At the
last, the feedback controller can compensate the output of the inverter accurately while
input voltage or output load changes.

19

20

power factor correction for wind and solar system

More Related Content

What's hot (20)

Similar to power factor correction for wind and solar system (20)

Recently uploaded (20)

power factor correction for wind and solar system