New monitoring equipment, providing sampling rates advised by the University of Manchester, was deployed at all 60 primary substations in the trial area and at tactical points on the distribution network. This high accuracy, high resolution monitoring was used to record all trial data.
The trials were developed to gain a full understanding of all the functions and their responses at different times of day and on different days of the year.
The academic research carried out by the University of Manchester, using the real-time data, has shown that a time dependent static load model, rather than the more complex dynamic model, can be used to estimate load response to changes in the voltage at primary busbars.
The trial results have shown that demand response changes both seasonally and diurnally. From the data observed during the trials the University of Manchester has been able to produce a set of indicative voltage/demand matrices that mathematically quantify the relationship between voltage and demand, allowing the estimation of the demand response for different load compositions.