A HYBRID WIND SOLAR ENERGY SYSTEM:A NEW RECTIFIER STAGE TOPOLOGY

Presented By

B.Rajesh kumar09071D4314

Under the guidanceof

Mrs.B.BhargaviAsst.prof.

EEED-VNRVJIET

CONTENTS Objective Block diagram Main circuit diagram Cuk converter SEPIC Proposed rectifier stage for a hybrid wind/pv system Various switching stages Maximum power point tracking (mppt) Characteristics Simulation results Advantages Applications References

OBJECTIVE

• This project presents a new system configuration of the front-end rectifier stage for a hybrid wind and photo voltaic energy system.

• This configuration allows the two sources to supply the load separately or simultaneously depending on the availability of the energy sources.

FIG. Hybrid system with multi-connected boost converter

MAIN CIRCUIT DIAGRAM

Block diagram

ONLY PV SOURCE IS IN OPERATION(CUK)

CUK CONVERTER

The Cuk converter is a type of DC-DC converter that has 

an output voltage magnitude that is either greater than 

or less than the input voltage magnitude.

ONLY WIND SOURCE IS IN OPERATION (SEPIC)

SEPIC Single ended primary induction converter (SEPIC) is a type 

of DC-DC  converter allowing  the  electrical  potential 

(voltage)  at  its  output  to  be  greater  than  or  less  than,  or 

equal to that at its input.

PROPOSED RECTIFIER STAGE FOR A HYBRID WIND / PV SYSTEM

VARIOUS SWITCHING STATES

The various switching states of the proposed converter. If the turn on duration of M1 is longer than M2, then the switching states will be state I, II, IV. Similarly, the switching states will be state I, III,IV if the switch conduction periods are vice versa

State II (M1 off, M2 on):

State III (M1 off, M2 off):

CHARACTERISTICS OF SOLAR

Characteristics of Wind

mechanical power output of the wind=

where

Flow chart for MPPT

Maximum Power Point Tracking

• A MPPT is an electronic DC to DC converter that optimizes the match between the solar array (PV panels), and the battery bank, utility power.

• There are different methods for MPPT Tracking 1. Hill Climbing/P&O

2. Incremental Conductance

3. Fractional Open-Circuit Voltage

4. Fractional Short-Circuit Current

5. Fuzzy Logic Control

6. Neural Network

Perturb & Observe Method Or Hill Climbing

• Hill climbing involves a perturbation in the duty ratio of the power converter, and P&O a perturbation in the operating voltage of the PV array

• Hill climbing and P&O methods are different ways to envision the same fundamental method.

• From Flow chart it can be seen that incrementing (decrementing) the

voltage increases (decreases) the power when operating on the left of the MPP and decreases (increases) the power when on the right of the MPP.

• Therefore, if there is an increase in power, the subsequent

perturbation should be kept the same to reach the MPP and if there is a decrease in power, the perturbation should be reversed.

Pv module

MPPT model for PV module

SIMULATION CIRCUIT FOR SOLAR ENERGY

PV SOURCE (CUK OPERATION) OUTPUT POWER

SIMULATION CIRCUIT FOR WIND ENERGY

Current and voltage waveforms for wind energy

WIND POWER

SIMULATION CIRCUIT FOR SOLAR-WIND ENERGY

SIMULATION RESULTS FOR SOLAR & WIND ENERGY

OUT PUT VOLTAGE (BOTH WIND & PV OPERATION)

OUT PUT POWER (BOTH WIND & PV OPERATION)

ADVANTAGES

• Additional input filters are not necessary to filter out high frequency harmonics

• Both renewable sources can be stepped up/down (supports wideranges of PV and wind input)

• MPPT can be realized for each surface

• Renewable energy source

• Large wind and solar PV systems are

Proportionally cheaper than two smaller systems

COMPARISION OF SOLAR, WIND AND COMBINED POWER

TIME PV POWER WIND POWER

COMBINED

0 0 0 0

0.02 20 380 450

0.04 98 600 735

0.06 115 1080 1129

0.08 112 1150 1200

0.10 110 1100 1200

0.12 110 1100 1200

CONCLUSION

It is noticed that additional input filters are not necessary to filter out high frequency harmonics.

Both renewable sources can be stepped up/down

MPPT can be realized for each source

Individual and simultaneous operations are supported

FUTURE SCOPE

The same work cab be extended to three phase system.

MPPT controller for 3 phase system can be developed.

REFERENCES

1. S.K. Kim, J.H Jeon, C.H. Cho, J.B. Ahn, and S.H. Kwon, “Dynamic Modeling and Control of a Grid-Connected Hybrid Generation System with Versatile Power Transfer,” IEEE Transactions on Industrial Electronics, vol. 55, pp. 1677-1688, April 2008.

2. D. Das, R. Esmaili, L. Xu, D. Nichols, “An Optimal Design of a Grid Connected Hybrid Wind/Photovoltaic/Fuel Cell System for Distributed Energy Production,” in Proc. IEEE Industrial Electronics Conference, pp. 2499-2504, Nov. 2005.

THANK YOU