An Efficient Design of Switched Boost Inverter for Universal Nano … · 2018-03-15 · converter can come from any suitable DC sources, such as batteries, solar panels, rectifiers

An Efficient Design of Switched Boost Inverter

for Universal Nano Grid to Improve Voltage 1John Chembukkavu and

2S. Poorani

1Department of Electrical & Electronics Engineering,

Karpagam University, Coimbatore, India. 2Department of Electrical & Electronics Engineering,

Karpagam University, Coimbatore, India.

Abstract To design a Switched Boost Inverter (SBI) Circuit and to test the

performance of the circuit by introducing solar PV instead of DC voltage

source and introduced a boost converter at the output stage to amplify and

stabilize the DC output of the SBI. The Vdcout of Existing SBI is 250V while

Proposed SBI is 600V, which is double the times better than the existing

circuitry, the RMS of the Existing SBI is 246.8 while the proposed SBI is

598.4 and the Mean of Existing SBI is 246.8 while the proposed is 598.4. The

proposed circuitry is highly reliable for Nano grids with solar pv as its

input source.

International Journal of Pure and Applied MathematicsVolume 116 No. 21 2017, 709-717ISSN: 1311-8080 (printed version); ISSN: 1314-3395 (on-line version)url: http://www.ijpam.euSpecial Issue ijpam.eu

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1. Introduction

The demand for electrical power & environmental constraints have resulted in

the want for new release of electrical vigour utilizing non-typical vigor

resources. Centralized vigour generation, transmission and distribution have a

couple of negative feedbacks which include dangerous satisfactory,

unreliability, fiscal losses and so on.[1-4]

To beat these causes power new release

at local stage has grown to be foremost. Micro grid is a brand new method to

mix non-conventional vigour assets on the smaller stage which additionally

facilitates the participation shoppers inside the electrical vigour process of

recent unencumber and distribution. [1-4]

The potential of the micro grid is its capacity to furnish secure and sustainable

electricity in areas now not blanketed with the aid of the average vigour grid.

Nanogrid incorporating distributed energy resources (DERs) along with suitable

vigour storage systems presents a first-rate, stiff, green electrical vigour.[1-3]

The

power converter which links the DERs and loads plays a significant position in

the nanogrid. This paper specializes in the option of raise converters considering

the fact that the nanogrid is chosen to be solar fed and battery much less. A

specific evaluation of tough switched conventional raise converter with soft-

switched resonant dc enhance converter has been achieved by means of

simulating these converters in MATLAB-Simulink. The distinctive parameters

particularly the voltage stress, switching losses, and converter efficiency had

been analyzed. [1-4]

2. Nanogrid

Nanogrids are the little microgrids, consistently serving a singular building or a

lone weight. Navigant research has developed its own specific significance of a

nanogrid as being 100 kW for lattice tied systems and 5 kW for remote

structures not interconnected with a utility system. Nanogrids imitate the

progression that is rising from the base of the pyramid and getting the

imaginative vitality of creating amounts of advancement dealers and hypothesis

capital, particularly in the splendid building and smart transportation spaces,

says Navigant.5

In various ways, nanogrids are more standard than microgrids since they don't

particularly challenge utilities likewise. Nanogrids are kept to a single building

or a lone weight, and subsequently don't thump up against bearings denying the

trade or sharing of power over an open right-of-way. From a development point

of view, possibly the most radical thought behind nanogrids is an unmistakable

slant for Direct Current (DC) courses of action, whether these systems are

connected with the system or work as standalone structures, as showed by

Navigant.5

International Journal of Pure and Applied Mathematics Special Issue

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Figure 1: Model of a Typical Nanogrid5

3. Switched Boost Inverter (SBI)

Figure 2: Circuit of SBI6

SBI is a power converter that can supply both DC and AC loads at the same

time from DC inputs. Along these lines, it can understand both the Dc-to-DC

converter for solar PV and the DC-to-AC converter in a solitary stage. The yield

AC voltage of SBI can be either higher or lower than the accessible source

voltage. 7 & 8

Thus, it has extensive variety of possible yield voltage for a given

source voltage. SBI displays better EMI. When contrasted with a customary

voltage source inverter (VSI), as the shoot-through (in which both switches in

one leg of the inverter scaffold are turned ON at the same time because of EMI

commotion won't harm the inverter switches).6 This lessens additional weight

on the converter security circuit and aides in acknowledgment of configuration

of the converter. As the SBI permits shoot-through in the inverter legs, it doesn't

require a timer circuit and henceforth reduces the requirement for complexions. 7 & 8

Boost Converter

Is a DC-to-DC power converter that boosts up voltage from its input to output.9

It is a type of switched-mode power supply (SMPS) containing at least two

semiconductors and at least one energy storage element, a capacitor, inductor,

or the two in combination. To reduce voltage ripple, filters made of capacitors

are normally added to such a converter's output and input.9 Power for the boost


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converter can come from any suitable DC sources, such as batteries, solar

panels, rectifiers and DC generators.9 A process that changes one DC voltage to

a different DC voltage is called DC to DC conversion. A boost converter is

a DC to DC converter with an output voltage greater than the source voltage.9 A

boost converter is sometimes called a step-up converter since it "steps up" the

source voltage. Since power must be conserved, the output current is lower than

the source current. The key principle that drives the boost converter is the

tendency of an inductor to resist changes in current by creating and destroying a

magnetic field. In a boost converter, the output voltage is always higher than the

input voltage.9

Figure 3: Schematic of Boost Converter9

4. Discussions

Existing Switched Boost Inverter

The existing SBI circuitry was designed using MATLAB Simulink, the model

have been powered with constant DC power supply without any DC output

regulating circuitry.

Figure 3: Existing Switched Boost Inverter

The existing SBI circuitry is shown in figure 3 and its corresponding input DC

supply voltage, generated AC output voltage and DC output voltage are plotted

in figure 4,5 and 6. And the parmeters like Vdcout, Root Mean Square (RMS)

and Mean are calculated and tabulated in Table 1.


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Figure 4: Existing SBI DC Input Voltage

Figure 5: Existing SBI AC Output Voltage

Figure 6: Existing SBI DC Output Voltage

Proposed Switched Boost Inverter

The proposed Switched Boost Inverter Circuit was analyzed by introducing

solar PV instead of DC voltage source and introduced a boost converter at the

output stage to amplify and stabilize the DC output of the SBI. The proposed

circuitry was designed using MATLAB Simulink as shown in figure 7, and its

corresponding driver circuitry is represented in figure 8 and solar pv circuitry in

figure 9.

Figure 7: Proposed Switched Boost inverter


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Figure 8: Driver Circuit of Proposed SBI

Figure 9: Solar PV of Proposed SBI

The major parameters like Vdcout, Root Mean Square (RMS) and Mean are

calculated and tabulated in Table 1. The proposed SBI’s AC output voltage,

Solar PV output voltage and DC output voltage are plotted in the figures 10, 11

and 12 respectively.

Figure 10: Proposed SBI AC Output


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Figure 11: Proposed SBI Solar PV Output

Figure 12: Proposed SBI DC Output

Table 1: Existing SBI Vs Proposed SBI

Parameters Existing SBI Proposed SBI

Vdcout 250 V 600 V

RMS 246.8 598.4

Mean 246.8 598.4

Figure 13: Comparison of Existing SBI Vs Proposed SBI

5. Conclusion

From the results it is clear that the proposed Switched Boost Inverter Circuit

which was analyzed by introducing solar PV instead of DC voltage source and

introduced a boost converter at the output stage to amplify and stabilize the DC

output of the SBI outperforms the existing SBI design. The Vdcout of Existing

SBI is 250V while Proposed SBI is 600V, which is double the times better than

the existing circuitry, the RMS of the Existing SBI is 246.8 while the proposed

0

100

200

300

400

500

600

Existing SBI Proposed SBI

Vdcout

RMS

Mean


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SBI is 598.4 and the Mean of Existing SBI is 246.8 while the proposed is 598.4

as plotted in the figure 13.

References [1] Chembukkavu J., Poorani S., A Survey on Some Converters and

Inverters used in Nanogrid, IJCTA 9(10) (2016), 1-11.

[2] Rohini G., Jaffar Sadiq Ali A., Buck Boost Inverter based Photovoltaic Power Generation System, Indian Journal of Science and Technology 8(32) (2015).

[3] Sree Devi I.S., Prabha D.M.S.R., Survey on Nanogrid Converters, Indian Journal of Science and Technology 8(24) (2015).

[4] Jeba Sundari Newlin D., Ramalakshmi R., Rajasekaran S., A Performance Comparison of Interleaved Boost Converter and Conventional Boost Converter for Renewable Energy Application, Proceedings of International Conference on Green High Performance Computing (2013).

[5] Sajeeb M.M.H., Rahman A., Arif S., Feasibility analysis of solar DC Nano grid for off grid rural Bangladesh, 3rd International Conference on Green Energy and Technology (2015).

[6] Ray O., Mishra S., Boost-Derived hybrid converter with simultaneous DC and AC outputs, IEEE Transactions on Industry Applications 50(2) (2014).

[7] Nag S.S., Adda R., Ray O., Mishra S.K., Current-fed switched inverter based hybrid topology for DC nanogrid application, 39th Annual Conference of the IEEE Industrial Electronics Society (2013), 7146-7151.

[8] Mishra S., Adda R., Joshi A., Inverse Watkins-Johnson topology based inverter, IEEE Trans. Power Electron 27(3) (2012), 1066– 1070.

[9] https://en.wikipedia.org/wiki/Boost_converter


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An Efficient Design of Switched Boost Inverter for Universal Nano … · 2018-03-15 · converter can come from any suitable DC sources, such as batteries, solar panels, rectifiers