Development of Wind-Solar Hybrid System using Multi Input ...€¦ · Permanent Magnet Synchronous...

Journal of Green Engineering (JGE)

Volume-10, Issue-1, January 2020

Development of Wind-Solar Hybrid System using Multi Input KY Boost Converter

Results from the Simulation Model

1M.Pushpavalli and

2N.M.JothiSwaroopan

1

Research Scholar, Department of EEE, Sathyabama Institute of Science and Technology, Chennai, India. E-mail:[email protected] 2

Professor, Department of EEE, RMK Engineering College, Chennai, India. E-mail: [email protected]

Abstract

A hybrid connection of clean energy sources like solar and wind energy with

a new novel multi input KY converter is used to extract the input from this

alternative energy sources and delivered to the AC load with the help of

inverter arrangement. This system is analyzed using the simulation model of

hybrid renewable energy sources, 1.under open loop condition 2.under

transient conditions 3.under closed loop condition. The closed loop system

used to maintain constant and quality power with the support of the

Proportional Integral (PI) controller. The steady state error and time response

parameters are taken into basis for the analysis of controller. The entire

system gives the constant output on the load side if any one of the renewable

energy is disconnected.

Keywords: Multi input KY converter, Hybrid renewable energy, PI

controller, Simulation model, closed loop system.

Journal of Green Engineering, Vol. 10_1, 238–254. Alpha Publishers

This is an Open Access publication. © 2020 the Author(s). All rights reserved

239 M.Pushpavalli et al

1 Introduction

The researchers are focusing now on Renewable energy development

due to the lack of fossil fuels and avoid carbon emission. Ministry of new

and renewable energy announced that non conventional scope by 2022 to go

beyond 175 GW target. But the biggest challenges facing on renewable

energy developments are energy efficient, quality power, uninterrupted

power, steady state performance under transient conditions [1, 2,14].

Another important challenge is choosing the DC-DC converters for this

hybrid system. The various DC-DC converters like buck,boost,

Luo,Sepic,Zeta and KY converters are available. Among that KY converters

are concluded and suitable for low power applications[3,13]. KY

converters used along with soft switching technique can be suitable for high

power utilizations [4].In PhotoVoltaic(PV) arrays,Maximum Power Point

Tracking (MPPT) methods are used to optimize the outpower of the PV

array which rely on solar temperature and irradiance. Because of its simple

implementation,the Perturb and Observation (P&O) MPPT method is

mostly used. An improved current reference technique is used to operate the

PV array method is adopted [5,19].The next important criterion in choosing

a suitable controller for the hybrid system. FLC primarily based Effective

Energy Management Controller to screen the power from all assets and load

demand constantly and to manipulate the entire hybrid energy device. FLC

makes the correct selection of choosing the resources [6,20]. This work

addressed variable speed wind farm designed for dynamic studies with

Permanent Magnet Synchronous Generator(PMSG) wind turbines.PMSG

proved completely highly reliable in both stable and transient

conditions[7].Hybrid the renewable energy source is the most important

challenge.The factors influence the hybridizations are a type of

integration,size of the unit,technology,storage unit ,controlling

techniques,energy management and loading arrangement[8,12].

The Expert and researchers are planning to operate the smart grid using

renewable energy which can do a reliable operation. In future renewable

energy can give 80% energy with all available technologies using major

resources like wind and solar[17,18]. It creates an inconsequential volume

of carbon dioxide, and its use cutdown the rapidness of global warming.

Renewable energy applications include household, commercial, industry

and powering agriculture. The most important challenge is storing

energy.So the researchers are focusing on batteries, converters, inverters and

control techniques for suitable applications. This work mainly focuses the

multi input KY converter used for solar wind hybrid system,prototype and

simulation also developed[15,16].


Results from the Simulation Model 240

2 System Description

Fig.1 Proposed multi input KY converter to hybrid energy

Fig 1 demonstrates the suggested multi input KY boost converter

connected to solarand wind hybrid systems. The KY converter connected

with the conventional synchronous rectified boostconverter [9]. This multi

input KY boost converter exists of four mosfets S1, S2, S3 and S4 D-diode ,

Lo-output inductor, C1-buffer capacitor and Co-output capacitor. Two

sources ,solar (V1) and wind (V2) connected through two input inductances

L1 and L2.V1 is the solar energy input and V2 is the wind energy

source.KY converter converts into DC voltage and maintains the DC bus

voltage. Three phase inverter converters into three phase ac voltage

maintain the frequency of 50 HZ.V1=50 V,V2=48V,Ky boost converter

output voltage is 320.

volt.

(1)

Vo=320 Volt.,Duty cycle=0.55.Switching frequency is

5KHZ,C1=47µF,L1=L2=1 mH,L=12 µH,Co=3200 µF.


.

2.1 Openloop System of Multi Input KY Boost Converter Hybrid

Connection

Figure 2 shows the open loop system of multi input KY converter

consists of muti input KY onverter,battery, Voltage source inverter

connected to R-load. Figure 3 Shows The 50 DC Voltage from the PV

(Photo Voltaic) Cell.This Solar Cell maintains constant irradiance and

temperature. Figure 4 Shows The 50 AC Voltage From Wind.It Is

Implemented With Permanent Magnet Synchronous Machine(Pmsm) with

constant Pitch Angle snd Wind Speed.Using Diode Rectifier Converts 50

Volt AC Voltage into 48 Volt DC Source. Figure 5 exhibits the Pulse

applied to Multi input KY Boost converter S1 and S2.In Mode 1 Mosfets 1

and 4 are Turned ON and Mode 2 Mosfets 2 and 3 Turned ON by giving

Trigger Pulse. Figure 6 Shows Voltage across Ky-Boost Converter is 320v.

The Voltage Maintained across DC Bus Bar is Constant.

Fig.2. Simulation diagram of multi input KY boost converter with Voltage source

inverter R-load



Fig.3. Voltage Across PV

Fig.4 Voltage across Wind

Fig.5. Pulse applied to Mosfets 1 &2.


Fig.6 DC Bus voltage

.

Fig.7. 3 Φ Voltage Source Inverter (VSI)

Figure 7 Shows 3 Φ VSI Converts 320 Volt DC Voltage into Three

Phase AC Voltage. The Voltage Obtained Using 120 Mode

Conduction.The Trigerring Pulse Given To M1,M3,M5 Inverter Shown in

Fig 8.



Fig.8 Triggering Pulse of Inverter M1, M3, M5

Fig.9. Voltage across resistive (R) load

Peak amplitude of phase voltage

Vp=

(2)

Line voltage

Vab= √ (3)


DC bus bar voltage Vdc=320 volt,Phase voltage Vp=176 volt,line

voltage=305V

Rms value of per phase load current.Resistance of the load R=50Ω.

√

(4)

Irms=2.61 Amps,Line current Iab=4.5 Amps

Figure 10 shows the line current through resistive load .

Fig.10. Current through Resistive(R) load

Fig.11. Output Power



Figure 11 shows the output.per phase power delivered to load

Po= (5)

Where Po=874 watts

Table-1 Openloop system output voltage, output current & output power

Parameter Vin Vo Io Po(RMS)

KY-Boost

Converter

98V 320V 4.5A 874W

3 Disturbance Applied to Openloop System of Multi Input

KY Converter Hybrid System

Fig.12. Voltage across PV


Fig.13. Voltage across wind

Small disturbances applied at 0.3 seconds.solar irradiance and wind

speed are varied. Figure 12 and 13 show the voltage across PV and wind.It

is observed that variation occurs in 0.3 seconds.

Fig.14. Voltage across KY-Boost Converter



Fig.15. Voltage across R-Load

Fig.16. Current through resistive (R) load



Figure 14,15,16 and 17 shows the voltage across KY boost

converter,three phase inverter line voltage across R load,phase inverter line

current across R load and output power.Due to transient condition in input

sources at 0.3 seconds variations occur in the output waveforms.To get a

stable and steady output in transient conditions ,the controller is necessary.

4 CLOSED LOOP SYSTEM

Closed loop system analyzed using PI controller. The controlled signal

from the controller fed to the pwm generator [10][11].The performance

metrics for this controllers are taken into account is time domain

parameters.

4.1 Multi Input KY Converter Hybrid System Using PI Controller

Fig.18.Simulation Diagram of Closed Loop PI Controller

The simulation diagram in figure 18 shows the closed loop system

using PI controller. The proportional gain value kp=0.018 and integral gain

value ki =3 are determined using Ziegler nichols method.

(6)



The present voltage and reference voltage (325 V) are compared and fed

to an error detector. The error signal applied to pi controller. It generates

control action to make zero error.

Fig.19. Voltage across KY Boost Converter

Fig.20.Voltage across R-Load


Figure 19, 20 and 21 shows the voltage across ky boost converter,three

phase inverter line voltage across R load and output power obtained using pi

controller.the disturbance applied at 0.3 seconds .the voltage

increased,decreased and finally settled.The time domain values are

tabulated in Table 2.


Table-2 Comparison of Time Domain Parameters (Vref = 325V)

Controller Tr(s) Ts(s) Tp(s) Ess(v)

PI 0.35 1.00 0.38 2.4

Analyzing time domain parameter for Closedloop system of multi input

KY converter, hybrid is used PI controller. From the investigation, (Ts)

Settling time, (Tr) Rise time, (Tp) Peak time and (ESS) Steady State Error

get reduced using PI.

5 Conclusion

In this paper, a hybrid connection of a PMSG, solar array and battery

works together to give the uninterrupted supply to the stand alone system.

An usual control approach for strength control amongst different strength wit

h multi input source is tested. Multi input KY boost converter maintains the

constant DC bus voltage irrespective of the available sources. Hybrid

combination tested under open loop, transient and closed loop methods.

Under the dynamic conditions PI controller analyzed. The steady state error

and time response parameter gives the better results for closed loop.

Declaration of Conflicting Interests

The authors claimed that there were no secret conflicts of interest about

this article's study, authorship publication.

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Biographies

M.Pushpavalli is a research scholar in department of Electrical &

Electronics Engineering, Sathyabama Insititute of Science & Techinology.

She is presently working as an assistant professor in the School of Electrical

and Electronic Engineering, Sathyabama Insititute of Science &

Techinology. She has a total teaching experience of 15 years. Her research

interests include Power electronics,Renewable Energy and Converters. She



has received the B. E-EEE (I class Distinction) in the year 2000 from

Manonmaniam Sundranar University. She has received M.E – Power

Electronics and Industrial drives (I class Exemplary) in the year 2013 from

Sathyabama University Chennai.

DR N.M. Jothi Swaroopan is a research supervisor in Department of EEE ,

Sathyabama Insititute of Science & Techinology. He is currently working as

PROFESSOR in Faculty of Electrical and Electronics Engineering, RMK

Engineering College. With more than 24 years of collective experience in

teaching . He received the B.E (1997) in Electrical and Electronics

Engineering from Manonmaniam Sundranar University .He completed his

M.E.(2005) and Ph.D.(2011) in Power System at the College of Engineering,

Anna University.

Development of Wind-Solar Hybrid System using Multi Input ...€¦ · Permanent Magnet Synchronous...

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