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Interconnectors

Chris Pearson

This topic came up in another forum where the original subject was the forthcoming ban on domestic coal.

I reckon that EdF would not have invested in IFA2 (local to me) with the aim of importing leccy, but the publicity materials mention the benefits of flow either way.

In my mind's eye I can visualize a bunch of generators being connected by the national grid such that their power flows down a voltage gradient to millions of consumers: the average voltage in the power stations must be higher than that at the consumers' intakes.

With me so far?

So how is the direction of flow in the interconnectors managed?

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    same idea,  but phasing the AC-DC conversion.

    In the sense that  that the phase voltage is higher or lower than the DC bus voltage at the instant the semiconductor switches open or close determines if current flows into or out of the line. And no, its not a set of 3 beautiful sine waves, nor a ripple free DC .

    AC inter-connectors also adjust the voltages to determine flow direction, but for longer lines the timing delays,  and the line capacitance and inductance, are such that it gets less and less practical beyond some tens of km even with Ls and Cs at the end to correct the phase shifts and provide what the RF folk call matching and everyone else calls power factor/phase shift.

    Mike

     

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    Many moons ago, I was working on the Channel Tunnel. The main DC cable to France runs straight through the approach to the UK terminal and the suggestion was made that it might be diverted to allow the works to proceed without danger of damaging it or the poor digger driver who might find it accidentally.

    The sum to divert is was not too great but then they added the compensation for it being out of use while any work was done - £1 million a day to compensate for the loss of profit.

    The cable stayed in place and was looked after very carefully.

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