IRJET- Integration of Renewable Energy in Smart Grid

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 4385
Integration of Renewable Energy in Smart Grid
Miss. Madhura N. Kolhapure1, Mr. Kedar L. Gaikwad2, Mr. M.M. Wagh3
1,2PG Student, Department of Technology, Shivaji University, Kolhapur
3Guided by- Mr. M.M. Wagh
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Abstract - The renewable energy sources have increased notably due to environmental issues and fossil fuels
elevated cost. combination of renewable energy sources to utility grid depends on the scale of power generation.
Large scale power generations are connected to transmission systems where as small scale distributed power
generation is connected to distribution systems. There are certain provocations in the integration of both types of
systems directly. Due to this, wind energy has gained a lot of investments from all over the world. However, due to
the wind speed‘s undetermined behavior it is difficult to obtain good quality power, since wind speed fluctuations
reflect on the voltage and active power output of the electric machine connected to the wind turbine. Solar
perforation also changes the voltage profile and frequency response of the system and affects the transmission and
distribution systems of utility grid. In this report is discussed the potential of the energy storage technology to
enhance the integration of renewable energy to the smart grid the issues, challenges and utilization of renewable
energy sources (RES) - Grid Integration.
1. Key Words: Renewable Energy, Smart Grid, Renewable energy sources.
1. INTRODUCTION
While renewable energy technologies like wind and solar have huge potential to reduce both greenhouse gas emissions and
other negative environmental impacts from electricity generation, integrating these technologies into the electric power grid
poses ongoing technological andinstitutional challenges. Large-scaledevelopmentof renewablepowerrequiresmodernization
of the electric power grid: both the high voltage transmission needed to transport and integrate electricity generated from
large, and variable renewable energy projects and the low-voltage distribution network needed to integrate small-scale,
decentralized renewable energy. The term “smart grid” represents these advances and includes a broad array of individual
technologies including advanced meters, sensors, energy storage, and others that are crucial for the integration of more
renewable and low carbon electricity into the electric power link. Smart grid also encompasses the development of new
standards, management practices, and systems to increase reliability, ensure affordability and manage temporal and spatial
variability of renewable electricity generation.
Smart grid has the potential to deliver multiple social benefits including a more reliable and secure energy sector, a more
powerful economy, a cleaner environment, and an empowered citizenry engaged in energy system management. In different
contexts and among different key actors, the potential benefits(andrisks)ofsmartgridareprioritizeddifferently.Althoughthe
critical links between a “smarter” grid and renewable energy are among the most prominent justifications for smart grid, the
multiple promises of smart grid result in a complicated policy discourse that extends beyond connections between smartgrid
and renewable. Developing a smarter grid involves the evolution of intertwinedtechnical andsocial systemslinkingpublicand
private stakeholders at federal, regional, and state levels.
2. ROLE OF SMART GRID:
Most of the world relies on electricity system built around 50 years ago. These are inefficient and cannot offer an appropriate
response to today’s urgent global challenges. There is an estimated $13 trillion investment required in energy infrastructure
over the next 20 years. This poses an imminent need and opportunity to shift towards a low carbon, efficient and cleanenergy
system. Smart Grids will be a necessary enabler in this transition. Smart grid is a expanding network of transmission lines,
equipment, controls and new technologies working together to respond immediately to our 21st Century demand for
electricity. It makes possible efficient and reliable end-to-end intelligent two-way delivery system from source to sink. In this
way the system brings efficiency and sustainability in meeting the growing demands of power with reliability and best of the
quality. Smart Grids also enables real time monitoring and control of power system. The basic objectives of Smart Grids is to
initiate active participation of customers, accommodate renewable energy generation and storage options, enable new
products and services which would provide a better economy, optimise strength utilisation and operate efficiently, address
disturbances through automated prevention, containment and restoration and operate resiliently against all hazards.

Existing grids were designed to deliver electricity to the consumers and bill them once a month. The energy demands have
been rising and it has become difficult for the existing grids to cope up with it. Smart Grids introduces a two-way transmission
where electricity and information can be exchanged between the customersandutilities.SmartGridsintegratesadvancednew
technologies, Smart meters and there is a provisionfordata monitoringandcontrol.Italsointegratesrenewableenergysuchas
the wind and solar energy to the grids. Besides that, the consumers can manage their electricity usage by measuring the
electricity consumption through the Smart meters installed at their homes. Smart instruments can be designed which would
adjust their run schedules to reduce electricity demand on the grid at critical times and lower the energy bills. Electricity is
more costly during peak times because additional and often less efficientpowerplants mustberuntomeetthehigherdemand.
Smart grids will enable utilities to manage and moderate electricity usage with the cooperation of their customers. Operators
can manage the electricity consumption in real-time. The current distributionsystemisinefficientandanybreak in thissystem
due to bad weather or storms or sudden changes in electricity demand can lead to power outages. Smart Grids distribution
intelligence counters these energy fluctuationsandoutagesbyautomaticallyidentifyingproblemsandre-routingandrestoring
power delivery.
Fig.2.1: Smart Grid
3. GENERAL FEATURES OF SMART GRID:
Smart grid has different features and can be distinguished as follows:-
a) Interactive with users and markets
b) Adaptive and scalable to varying situations
c) optimized to make the best use of resources and equipment
d) Pro-active instead of reactive to prevent emergencies
e) Self-healing grids with advanced automation
f) Integrated, merging monitoring, control, protection,
g) Maintenance, EMS, DMS, AMI, etc.
h) Having plug-and-play –features for network equipment
i) ICT solutions
j) Secure & reliable
k) Cost efficient
l) Provides real time data and monitoring
Traditional grid includes centralized power generation, and at the distribution level unidirectional power flow and weak
market integration.Smartgridsincludecentralizepower generationproducedconsiderablyby renewableenergy sources.They
integrate spreaded and active resources , into energy markets and power systems. Smart grid is the electrical network that
smartly combines producers and consumers to efficiently deliver electricity which is sufficiently capable and coverage area
accessible, safe, economic, reliable, efficient, and sustainable. Smart grid development tends to be driven by one of the two
principal visions for enhancing electric power interactions for both utilities and end use customers.

Fig.:Smart Grid Features
Comparison Conventional Grid Proposed Smart Grid
Information flow Unidirectional Bidirectional
Electricity generation Central generation Distributed generation
Overall efficiency Low High
Environmentalpollution High Low
Sensors Few Many
Monitoring Ability Usually blind Self-monitoring
Grid topology Radial Network
Table :Comparison between existing grid and smart grid
4. SMART GRID TECHNOLOGY:
Renewable energy systems (RESs) cannot directly replace the existing electric energy grid system. The new technologies are
not developed enough to meet the total energy demand. Therefore, there is need to use renewable energysourcesintoexisting
grids and transform the system.

Fig. Intelligent energy conversion nodes.
A smart grid is modelled by two concentric circles the outer circle represents energy flow and the inner circle represents
information flow over communication networks. Different approaches to manage energy flow in grids combining distributed
power generation have been imposed. One interesting idea is the energy hub to manage multiple energy carriers.Withineach
hub there are energy converters that transform one part of energy flow into another form of energy. Fig. 4.1 is a possible
scenario of the future power system based onsmart-gridtechnologies,withpowerelectronicbuildingblocks(PEBBs).Withthe
development of smart grid technology, the meters will control home appliances,where userscanadoptmoreunique strategies
to reduce the cost of electricity during the high electricity price. Hence peak load shifting can be achieved, and the system will
tend to be more economic and environmental friendly.
5. CHARACTERSTICS OF SMART GRID:
The principal characteristics of a smart grid to full-fill the objective of electrical power sector, the Smart Grid has the great
characteristics are:
1. Safe and Reliable: The electricity is still on the power supply capacity for the user, rather than a large are a power outgain
large electricity failures, malfunctions, natural disasters and extreme weather, or man -made damage done to maintain.
2. Efficient and Economical: power grid, will be able to improve the economic benefits through related Policy innovation,
management and energy efficient, and market competition orderly. Power networks are supported to provide for rational
allocation of resources to power deal effectively with the electricity market, to reduce power loss and improve the energy
efficiency and finally.
3. Clean and Green: With the large-scale of renewable energy sources, Smart Grid can reduce the potential impact on the
environment e.g., carbon emission reduction, more green energy.
4. Optimization: The most appropriate price of the electrical energy provided to the society. Smart grid to optimize resource
utilization; reduce investment costs and operation and maintenance costs. Power quality meets industry standards and
consumer demands too.
5. Interactive: With the interaction and real-time response to the power market and users, the servicesareincreased.Mature
wholesale market operations in place, well integrated nation and integrated with good coordinators.
6. Self-healing: The new power grid has a features Self-healing. It is a process that improves services quality, enhances
reliability and reduces costs. It identifies and correct supply demand imbalance instantaneously and detect faults.
7. Ductile and Compatible: The new power grid can support correct, reasonable integration of renewable energy resources
and it is suitable for integration of distributed generation and micro power grid .Moreover, it can improve and enhance the
function of demand side management to achieve the efficient interaction capability with consumers. It is compatible with the
present grid also.

8. Integrated: A unified platform and model are employed on a grid. It can obtain good quality of integrationandinformation
sharing of power grid and to achieve standard, normative and refined management that integrates the infrastructure,
processes, devices, information and structure of market so that electricity can be generated, distributed, and used more
efficiently and cost effective.
6. PROBLEMS WITH THE CURRENT GRID:
An electrical grid is an interconnected network to distribute Electricity from suppliers to consumers. The electrical grid has
evolved from an insular system that serviced a particular geographic area to a wider, expansive network that incorporated
multiple areas. The electric power grid is a complex system that transfers electricity generated at power plants to substations
via transmission lines, and then to a variety of consumers throughout the nation via distribution lines. This system was
developed by connecting local grids to form more robust and larger networks. While this methodology worked in the past,
widespread development has overburdened the grid in high-demand regions. As a result of this increase in demand, the grid
often experiences disturbance in electric service. Many of these interruptions occur due to problems at the distribution level
and may be mitigated by distributed energy storage approaches. Service interruptions exhibittheinefficienciesofcurrentgrid
networks and emphasize the dire need to modernize the electric grid so that it can respond to increasing electricity demands
and shifts in generation sources. While building new generation plants and transmission and distribution lines is a costly and
time-consuming endeavour, energy storage can optimize the capacity factor of current grid operation.
Advanced storage could provide a dependable and cost-effective another to infrastructure expansion. Perhaps the most
significant trend driving the need for grid-scale energy storage is the shifttorenewableenergysources,suchaswindandsolar.
While coal has traditionally been the largest fuel source for electricity generation, emphasis on cleaner energy and decreased
reliance on fossil fuels and other non-renewable sources has placed greater attention on renewable sources for electricity
generation.
6.1 Technical Benefits:
The most relevant technical benefits of EES are the following:
a) Bulk energy time-shifting, for load levellingandpeak shaving,providingelectricitypricearbitrage.Forinstance,electric
vehicles represent one type of EES that can provide these power management benefits, leading to smart grid and RES
integration.
b) More efficient use and contribution of renewable energy is guaranteed using EES, alsofomentingtheuseofdistributed
energy supply options in grids.
c) Efficient storage can be used to provide up to two times its capacity for regulation applications; using full charge
(down) and full discharge (up).
d) Storage output can be changed rapidly giving a ramping support and black-start to the grid (from none to full or from
full to none within seconds rather than minutes)
e) Energy storage can be used as a solution for improving grid service reliability.
f) Energy storage can benefit utilities or independent system operators allowing transmission and distribution upgrade
deferrals.
6.2 Economic Benefits:
The most relevant economic benefits of EES are the following:
a) Energy storage can reduce costs of customers electricity.
b) In general, off-peak electricity is cheaper compared to high-peak electricity, and this also benefits the seller of
electricity.
c) It plays a key role on stabilizing the electricity market price freeing the power sector from
a) Speculations and the volatility imposed by fossil fuels.
d) It will contribute to the economic development and employment opportunities for many countries.
e) It will allow more efficient use of renewable and off-peak generation capacity, encouraging more investment
opportunities on these technologies.
f) EES may help to avoid transmission congestion charges, which are very expensive and most of utilities try to avoid
them in a deregulated market environment.
g) Reduces the need for transmission and distribution capacity upgrades, thus minimizing unnecessary investments.

h) Increases and improves availability of ancillary services, reducing penalties to generators and the cost of over
dimensioning infrastructures.
i) Allows a market-driven electricity dispatch, stimulate proactiveparticipationofthecustomerstosecuretheirbenefits
and creates a cost sharing scheme in the power system.
7. RENEWABLE GRID INTEGRATION:
Increasing renewable electricity generation is an essential for achieving double renewable energy share in theglobal energy.
Such a transformation is technically feasible, but will require upgrades of old grid systems and new innovative ideas to
accommodate the different nature of renewable energy generation. In addition, smart grids offer benefits that can further be
easy for transition of renewables. There are several alternatives to conventional, utility-scale Power plants.
These include:
o Supply-side options, such as distributed generation.
o Demand-side options, such as demand-side management.
o Storage options, such as EVs, batteries, and thermal storage.
Smart grid technologies allows for optimal use of these alternative technologies,andhenceavoidthe needfornewlargepower
plants. These alternatives are generally manageable to direct private sector investment and can help address utility under
investment and capital constraints. This integration can help enable both utility-scale renewable and smaller distributed
renewable generation. New resources such as DSM and distributed storage make it possible to incorporate higher levels of
variable resources (such as wind turbines) in a system. Supervisory Control and Data Acquisition system that will enhance
renewable integration support DSM and help pinpoint losses.
8. ISSUES OF RENEWABLE ENERGY SOURCES SYSTEMS – GRID INTEGRATION
8.1 Wind Energy System:
Due to availability of wind renewable energy sources abundantly, wind energy generation is increasing day by day to develop
rural electrification, increase job opportunities in technology. But there are somerestrictionstothepowerful windenergy into
the grid. Wind speed forecasting has high uncertainty, high volatility and low predictability reduces the system security and
wind revenue. Problem in maintaining voltage profile. Most of the wind turbines are coupled with SCIG, which are not able to
support reactive power within the system. More stress on breaker, transmission line, bus bar at the time offaultoccurs,dueto
high penetration of wind energy resources due to low fault ride-through (FRT) capability of wind generator. High pungent of
wind energy creates stability problem, and possible blackouts thus wind energy penetration is limited by ATC (available
transfer capability) of the system. Frequency behavior of the system also changes with wind pungent due to lower inertia of
distributed wind generators. Finally, wind energy pungent reduces overall efficiency and power quality
8.2 Solar Energy System:
The huge amount of solar energy is available on the earth. Humans consume almost 15 TW of solar energy. Customers are
interested in solar power due to low cost, environment friendly, flexible installation and no reactive power consumption by
solar panel. But constraints of solar generationare:highinstallationcostofsolarpanels,lowgenerationcapacity,uncertaintyof
solar irradiance, and power fluctuation due to intermittency behavior of sunlight . Solar pungent also changes the voltage
profile and frequency response of the system. PV system is drawn with unity power factor and the characteristics of output
power are dependent on the inverter. Since photovoltaic system has no inertia, some more devices are needed to maintain
frequency oscillation.
A. Technical Issues:
The technical issues are described as
1. Power quality
a. Harmonics
b. Frequency and voltage fluctuation

2. Power fluctuation
a. Small time power fluctuations
b. Long time or seasonal power fluctuations
3. Storage
4. Protection issues
5. Optimal placement of RES
6. Islanding.
B. Non- Technical Issues:
1. Due to scarcity of technical skilled workers.
2. Less reachable transmission line to accommodate RES.
3. RES technologies are excluded from the competition which demoralize the installation of new power plant for reserve
purpose.
9. VARIOUS SOLUTIONS OF RES UTILIZATION
The renewable energy sources such as solar, wind etc. has acceleratedthetransitiontowardsgreener energysources.Keeping
in view of the aforesaid some of the key solutions for RES utilizations are:
1. The power balance using RES can be carried out by integrating RES with energy storage unit. The benefits of battery energy
storage system (BESS) are classified based on end – users as: Transmission level uses, System level uses, ISO Market uses.
2. Intermittence of power generation from the RES can be controlled by generating the power from distributing RES to larger
geographical area in small units instead of large unit concentrating in one area.
3 In case of agricultural load, the load is fed during the night time or off peak load time and this is fed by conventional grid. On
other hand power generated by RES like solar PV is generated during day time so we can use this power for agricultural
purposes instead of storing the energy for later time which increases the cost of the overall system. Using the solar water
pumping for irrigation gives very high efficiency approx 70% to 80% and the cost of solar water pumping is much lesser than
the induction motor pumping type.
4. In large solar PV plant output power oscillating during the whole day and this power is fed to the grid, continuously
fluctuating power gives rise to the security concern to the grid for making stable grid.
Solar PV plant have to install the different type of storage system which gives additional cost to the plant owner. Once the
storage system is fully charged then this storage components gives no profit to the system owner. Thereforesolarbasedwater
pumping system may be installed substitute of storage system.
10. CONCLUSION:
In recent years in the power generation and distribution system shows that penetration level ofDGintotheGridhasincreased
considerably. End user appliances are becoming more careful to the power quality condition. This Case presents a technical
review of causes of Power quality Problems associated with renewable based distribution generation system (wind energy,
solar energy). Voltage decrease with wind penetration and increase with solar perforation. To minimize the fluctuations and
intermittent problems power electronic devices are viableoptions.Further, energystorageanduseofdumploadcouldbeused
for reducing the power fluctuations in PV systems. The up-gradation in balance of systems by incorporatingthenewmaterials
and storage elements could reduce the problems associated with grid integration.

Reference:
1. “Smart Grid Technology :Appliocations and Control” Indrajeet Prasad. International journal of advanced researchin
Electrical, Electronics and Instrumentation engineering.(IJAREEIE) vol: 3,Issue:5 May 2014
2. Sheetal Munje. Et al.“Renewable energy integration into smart grid-Energy storage, Technologies and Challenges”.
International research journal of engineering and technology(IRJET), Vol:4 Issue:6
3. Abdulhakim Khalf Alsaif,et al “Challenges and benefits of integrating the renewable energy technologies into AC
power system grid American journal of engineering research(AJER) vol:6, Issue:4,pp-95-100
4. “Issues, Challenges, Causes, Impacts and Utilization of Renewable Energy Sources-Grid Integration” Er. Mamatha
Sandhu , Dr.Tilak Thakur, International journal of engineering research andapplication(IJERA)vol:4,Issue:3,pp-636-
643

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