How aware are we about the electricity consumption apart from monthly electric bills? How many times haven’t we cribbed about the unplanned power cuts and black outs? As “gadget Gurus” we always keep our electronic gadgets updated. Is the power grid giving the required quality of power to these gadgets? Well, a solution to these may not be prevalent today but is a vision of tomorrow. The Electricity system of future has to produce and deliver electricity that is reliable, affordable and clean. To accomplish these goals, both electricity grid and existing regulatory system needs to get smarter. “SMART Grid” is an intelligent step to evolve from our era of power grid towards a brighter future.
Existing Grid System / Power Grid
The existing grid system delivers electricity from point of generation to consumers. This Electricity delivery system functions via two systems
- 1. Transmission System
The Transmission system delivers electricity from power plant to distribution Substations. Here the transmission voltage will be very high (110kV or above), to reduce the energy lost in long distance transmission
- 2. Distribution system
The distribution system delivers electricity form substations to consumers. Typically the network includes medium voltage (less than 50 kV) power lines, pole mounted transformers, low voltage (less than 1kV) distribution wiring.
In this existing system the focus is more on protection of asset when a system failure happens rather than automatically detecting the emerging transmission and distribution problems. The customer is uninformed and they are not a part of the existing power system. Moreover the focus is on power shutdown / outages rather than power quality problems.
What is Smart Grid ?
The basic concept of Smart Grid is to add monitoring, analysis, control and communication capabilities to the national electric grid in order to improve reliability, maximize throughput, increase energy efficiency, provide consumer participation and allow diverse generation and storage options.
Building a smart grid means adding computer and communication technology to the existing electricity grid. With an overlay of digital technology, the grid promises to operate more efficiently and reliably. It can also accommodate more solar and wind power, which are inconsistent sources of energy that can become more reliable with better controls. Much like computers and routers manage the flow of bits on the Internet, smart-grid technologies use information to optimize the flow of electricity.
How smart grid differs from the existing grid system /Power grid ?
Right now, if there is a breakdown at your local substation, it is not rectified until the customers call to complain. This can be avoided by placing a networked sensor inside a transformer or along wires which would locate and report a problem, or prevent it from happening.
Despite living in the age of information, most of us only get a glimpse of our energy consumption when the utility bills come once a month. With smart grid, it should mean more detailed information on usage of electricity through home energy-monitoring tools. These can be small displays or Web-based programs that give a real-time view of how much energy you are using, which appliances consume the most, and how your home compares to others.
What is needed to start is a smart meter with two-way communication or some other kind of gateway. Once that conduit is put in place, consumers can get more detailed energy data and start taking advantage of efficiency incentives, such as charging your plug-in electric vehicle in the middle of the night to get off-peak rates.
The next step towards efficiency is what is called demand response. The goal here is to dial back energy consumption at peak times. This is very important to utilities because it's costly and polluting to bring on auxiliary power plants to meet a spike in demand, say, from an air conditioning load on a hot summer day. Consumers and businesses have financial incentives to participate, such as a discounted rate. "Shedding load" could mean turning the gas heat off of the clothes drier for a few minutes or dimming the lights in a supermarket in the middle of the day.
A smarter grid also makes distributed energy, such as home solar systems, more viable and user-friendly. With a smart meter and monitoring software, a home owner can see how much solar panels are producing and their carbon footprint is being reduced. A utility, too, is keenly interested in how much distributed energy is available so it can calibrate its own daily power generation.
Smart Grid Characteristics
The functionality of smart grid can be defined by the following characteristics
- • It will enable active participation of consumers, ie., it will give consumers information, control and options that enable them to engage in new “electricity markets”. Well informed consumers will modify consumption based on the balancing of their demands and resources.
- • It will accommodate all generation and storage options. It will seamlessly integrate all types and sizes of electrical generation and storage systems using simplified interconnection process and universal interoperability standards to support a “plug-and-play” level of convenience.
- • It will enable new products, services and markets. Support the creation of new electricity market from the home energy management system at the consumer’s premises to technologies that allow consumers and third parties to bid their energy resources into the electricity market.
- • It will provide power quality for the digital economy. It will monitor, diagnose and respond to the power quality deficiencies resulting in dramatic reduction in the business losses currently experienced by consumers due to insufficient power quality.
- • It will anticipate and respond to system disturbance. It will heal itself by performing continuous self-assessment to detect and analyze issues, take corrective action to mitigate them. It will also handle problems too large or too fast-moving for human intervention.
- • It will operate resiliently against attack and natural disaster. The smart grid will incorporate a system-wide solution that reduces physical and cyber vulnerabilities and enables a rapid recovery from disruptions.
Thus the transformation to Smart Grid would give all the features that would have once been impossible with Power Grid. Let us move to the grid technology which is of good quality, reliable and smarter.