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Category "Power"

13Jun

Automatic Under-Frequency Load Shedding

by Team Digireach

The maintenance of maximum service reliability has always been the primary concern of the electric utility industry. To ensure this, power systems are always designed and operated such that working is not affected in any system conditions and load requirements are always met. Usually the designing is such that it can hold up service continuity even under emergency situations, but sometimes, unpredictable conditions of faults, forced outages, etc. may occur. When this happens, it is important to ensure that steps are taken to ensure that a major system outage doesn’t occur.

Any part of a power system will begin to deteriorate if there is an excess of load over available generation. If there is an excess of load over generation ratio, the frequency decreases. It is generally recognised that a sudden drop in generating capacity results in a drop in frequency. This drop is not immediate, but rather, happens gradually.

One way to attain the balance between generation and load, before the decaying frequency affects performance, is to increase generation. However this isn’t always possible practically due to system limitations or due to time constraints. So, a more common method is to employ Automatic Under-Frequency Load Shedding (AUFLS). What this does is that it employs a quick and effective means of attaining a balance of generation and load. The application of AUFLS relays throughout the load area, preset to drop increments of load at specific values of low frequency, provides a simple and direct method of minimizing service interruption and alleviating system overloads.

The Load Shedding function provides under-frequency protection at the main distribution substation. As system frequency decreases, load is disconnected in discrete steps according to frequency thresholds. Protective relays are used for automatic gradually under-frequency load shedding. Under and over-frequency relays are specified by frequency settings and delays. And all this can be incorporated by using IoT Gateway which requires minimum system integration and is fully compatible with most of the applications.

8Apr

IPDS (Integrated Power Development Scheme)

by Team Digireach

We are moving to an energy intensive world. Among the different stages of electricity generation and consumption, distribution is a primary area where we can make necessary adjustments in the power sector value chain to increase efficiency drastically.

One of the features of the Indian power sector reforms is the increased attention to the distribution sector. Systems and procedures for monitoring Quality of Service (QoS) of distribution utilities have been finalized by State Electricity Regulatory Commissions, especially subsequent to the Electricity Act 2003.

Distribution is the most important link in the entire power sector value chain.  As the only interface between utilities and consumers, it is the cash register for the entire sector. Under the Indian Constitution, power is a Concurrent subject and the responsibility for distribution and supply of power to rural and urban consumers rests with the states.

Systems to improve consumer interface, quantify performance and to monitor progress in a transparent manner are necessary and welcome steps. QoS process meets one of the many long felt needs to improve distribution sector. At this initial stage, it is crucial that the distribution utilities and regulatory commissions show serious end to end commitment in the QoS process. This includes the steps of formulating the system, reporting performance, monitoring progress and taking corrective measures. It is also important to proactively work for the active participation of consumers at all stages of the process. With such an approach, over the years, QoS process can evolve to be the necessary and sufficient condition for continuous improvement of the distribution sector.

Government of India provides assistance to states through various Central Sector / centrally sponsored schemes for improving the distribution sector. Integrated Power Development Scheme (IPDS) approved on 20.11.2014 with a total outlay of Rs 32,612 crore which includes a budgetary support of Rs 25,354 crore from Govt. of India. The objectives of scheme are:

  • Strengthening of sub-transmission and distribution networks in the urban areas
  • Metering of distribution transformers / feeders / consumers in the urban area.
  • IT enablement of distribution sector and strengthening of distribution network
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