Connection of Converters to a Low and Medium Power DC Network Using an Inductor Circut This paper describes an alternative to connect power converters to a direct-current network with an inductor circuit. The circuit allows the connection of converters through a coil and avoids short-circuit currents with different instantaneous values of voltage output. A description of the calculation and the choice of components together with a real implemented example in a dc network within Smart City project (Endesa Utility) is presented Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/power-system-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

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Copyright © 2016LeMenizInfotech. All rights reserved
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Connection of Converters to a Low and
Medium Power DC Network Using an
Inductor Circuit
Introduction:
The most important contribution to the energy mix is from wind
power and photovoltaic sources. In recent years, how the installation
of distributed generation, which has been highly promoted in the
country, has been seen to have increased exponentially in medium and
low voltage networks. Connections are made to the network using
power converters in the majority of applications. It is noteworthy that
these forms of energy are increasingly popular and are used in self
generation or to generate energy for input to the grid from a
residential installation.
Existing system:
Capacitor is usually used in the DC-Link for various reasons.
However, we increasingly see the possibility of DC networks where
currents converge generation from different energy sources, both low
voltage and medium voltage (MVDC). In the DC-link, the real values
of capacitors should be recalculated when taking into account that the
network can be extended by connecting new generation sources. If a
capacitor is sized to all DC side energy storage rating, the cost and the
size can be expensive. One of the problems with the connection of
power converters to a DC network is that although the average
voltage values are equal, the instantaneous values need not be
matched, causing short circuits if they are connected directly to the
DC-Link. This is usually avoided with the use of capacitors.

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Pondicherry-605 005.
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Disadvantages:
 Cause short circuits if they are connected directly to DC-Link.
 If converter can be disconnected, supplying current to the DC-
Link as this would cause surges and arcs in switch.
Proposed system:
A circuit design based on an inductor to connect the converters
to the DC-Link that has no need for the use of a capacitor is
presented. The inductor is calculated for each power converter
connected to the Dc-Link. The calculation of inductor does not affect
the inductors previously connected to the DC-link. A DC-Link
diagram where different generation sources may converge is shown in
Figure. As can be seen, each converter will have a switch to connect it
through to the DCLink. The connection in this scheme may produce a
short circuit if there is no capacitor in the DC-Link. This can be
resolved by connecting the converters using an inductor for each of
the converters. This solution is more flexible because it allows easy
expansion and is also more economical because the sizing is carried
out for each of the converters.

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Copyright © 2016LeMenizInfotech. All rights reserved
LeMenizInfotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web :www.lemenizinfotech.com/ www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Advantages:
 Inductor does not affect the inductors previously connected to
the DC-link.
 More flexible because it allows easy expansion
 More economical because the sizing is carried out for each of
the converters
 To converter disconnection, current-limiting circuit of the
inductor by means of two diodes, one of them a zener diode
Applications:
 Wind power and photovoltaic sources.

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Copyright © 2016LeMenizInfotech. All rights reserved
LeMenizInfotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web :www.lemenizinfotech.com/ www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Block diagram:
–––––Wind supply
Isolation Circuit12V DC
5V DC
Buffer Circuit
Micro Controller
Circuit
Driver Circuit 12V DC
Solar or DC
supply
Rectifier
Converter 2
Converter 1
Inverter Load