Skip to content
Electric Power E-mail

Technology Vision 2020 report on ‘Electric Power’, interalia, identified reduction in transmission and distribution losses as a major priority for achieving the broad goal of providing sufficient and quality power to people. Based on a series of discussions and meetings of the Action Team on Electric Power, following two major projects were identified and were taken up for implementation in association with BHEL.

1. Static Compensator (STATCOM)

The objective of the project was to develop a 1 MVAR capacity STATCOM which could be installed at an industrial premise. STATCOM or Static Compensator is a power electronics device which can be used in both transmission and distribution network for power quality improvement. It improves power factor through reactive power compensation. It is essentially an improved version of static VAR compensator using a Voltage Source Converter (VSC) which is connected to the line through a series inductance. Depending on the comparative values of the line voltage and the source voltage, either leading or lagging reactive current is produced, which helps in improving the power factor.

The implementation of voltage source converter was done using Insulated Gate Bipolar Transistors (IGBTs), with Pulse Width Modulation (PWM) technology. IGBTs are less costly and provide a better technical solution as compared to Gate Turn-off Thyrostorts (GTOs).  A system was fabricated and installed at the BHEL R&D Campus, Hyderabad.

The ideal application envisaged is a SEB 132 kV grid connected to a rolling mill, arc furnace or industrial plant.

2. Phase Shifting Transformer (PST)

The concept of Flexible AC Transmission Systems (FACTS) capable of power electronic based, real time control of transmission systems is hailed as potential solution to many problems associated with conventional AC power systems. A phase shifting transformer is a promising power system component in the context of FACTS. It helps in overcoming the problems associated with parallel transmission paths and systems inter-tie loop flows. Objectives of the project were; 

  • Development of a prototype phase shifting transformer of 2 MVA power rating for a 33 kV transmission line application. This consists of two transformers, namely a series and a shunt transformer.
  • Development of a thyristor controlled static static tap changer

The PST and tap changer were developed and installed in one of the two parallel 33 kV transmission lines that carry to the BHEL Corporate R&D campus, Hyderabad.  

For further information on Technology Vision2020 Mission projects email us at: This e-mail address is being protected from spambots. You need JavaScript enabled to view it