Power & Energy

Power and Energy

The Benefits

Triple frequency injection adds up to 33% to the power rating of a transmission line.
Or keep the power the same and swap Amps for Volts to reduce resistive line losses by up to 33%

Who should be interested in this?

Grid and distribution system operators.
Any business making equipment for these organisations.
Any energy business looking to transition from fossil fuels to renewable electrical energy.
Constructors of vehicles and power systems for ships aircraft and land vehicles where weight and efficiency matter.
Nations looking to install a long distance power transmission system.
Subsea transmission system operators and equipment providers for these.
Transformer manufacturers.
Cable makers.
Power station (at all levels) designers.

Background

We have invented a triple harmonic injector which makes it easy to set up a power transmission system based on the third harmonic injection concept. We have filed a UK patent application and received an encouraging examiner's report. We have advanced the patent application to the PCT stage. (See Patents). We continue to develop other ideas which will make this technology a practical proposition.

“Plug and Play”

Having discussed this technology extensively with potential users (e.g. grid and distribution system operators) the message we get back is that this is a great idea but we have firm views about how we like to operate (e.g. star points solidly grounded). The star point driver technology (see Patents) is the key to overcoming this objection. It makes the start points of the transformers look like a solid ground at fundamental frequency while injecting a triple frequency voltage waveform. It handles balanced and unbalanced loads on the three phase system. It handles faults by behaving as a solid connection to ground while the fault is detected and protection equipment operates. Other matters need consideration. The power system three-phase transformers have to be coordinated with the new capabilities of the transmission system. The cost and the need to make changes depend on whether the system is new or the technology is being retrofitted to existing transmission lines. We have the answers. With the plug-and-play injectors in place these issues become secondary considerations.

Power capability increase or energy saving - a quick payback?

Instead of using the third harmonic system to increase the power rating, it can be used to raise the effective voltage by 15% (without increasing peak line-to-ground voltage) and thus to reduce the current by 15% for the same power transmission. I2R losses in the lines and transformer windings will thereby be reduced by 30%.

Power loss in a transmission system consisting of transformers and transmission line can be as high as 5% (IEC publication "Efficient Electrical Energy Transmission and Distribution". 2007). If we assume that the I2R losses account for 4% of losses then a 30% saving in I2R losses would give a 1.2% power saving. For a 100MW system the power saving at full power would be 1.2MW. Over a year that would represent an energy saving of 10,512 MWhr. Assuming a wholesale electricity price of £50/MWhr the third harmonic injection system could save approximately £0.5M per year. It is early days to put a price on the third harmonic injection system but these calculations give an indication that the payback time may be quite short. In a new build situation the transformer windings can be chosen to match the requirements of the triple harmonic injection system. In a retrofit situation, one transformer may need changing since a common arrangement for the transformers is to configure the sending end transformer winding in star and the receiving end transformer winding in delta and hence the payback time in that situation would be somewhat longer but should still be attractive.

If you are interested in partnering with us on this project and would like more information please do get in touch (see Contact Us).

Scroll to Top