Investigating Correlation of PV Generation Time Series

Investigating Correlation of PV Generation Time Series

There is a perceived risk that too much renewable energy generation could destabilise the electricity grid.  As a result it is becoming harder for new PV sites to connect to the grid.  We are interested in quantifying the impact on the electricity grid of solar PV generators, so that the grid operators can be confident in allowing more PV to come online.

The impact on the grid of PV is greatest when systems are generating at the same time, so this paper seeks to quantify the correlation between the generation of systems at a half hourly time period as a function of the distance between the systems.

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  1. Steve Rogers

    Steve Rogers on 07/01/2015 8:53 p.m. #

    Presumably turbines within wind farms suffer even more from this potential correlation problem. I guess they use some intermediate hardware to handle this before the power is delivered to the grid?
    Also, in Germany the proportion of power generated by PV is about 10 times greater than the UK so I guess we still have some headroom (unless the German grid is better able to handle correlated events).

  2. Jamie Taylor

    Jamie Taylor on 30/01/2015 12:55 p.m. #

    Hi Steve,

    Sorry I've only just seen your comment.

    You're right that this will affect both wind and solar, but wind farms (and large scale solar farms for that matter) are not so relevant in this study because they are generally connected directly into the MV (or HV) network, and are also mostly individually metered by the grid operator (so they can monitor for potential problems). There are steps the grid/plant operator can take to mitigate voltage issues due to wind/solar farms at the MV network level such as Active Power Control.
    In this work we're mostly concerned with studying how distributed small-scale solar will impact on the transmission (HV) and MV networks i.e. how the distributed data should be amalgamated to accurately now-cast/forecast generation at the MV and HV level.

    Germany has already reached grid capacity in several regions and are having to take steps to curtail generation from distributed small scale solar (which makes up the majority of their solar capacity). They're also investing in incentives for grid connected storage to help buffer the affects of grid overload due to variable generation technologies such as wind and solar. Here's an interesting article on the topic:

    Thanks for the interest and comments.

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