A Stability Analysis of Thermostatically Controlled Loads for Power System Frequency Control

Figure 13

Cumulative response savings (MWh), the difference between other providers’ response with and without the frequency-sensitive fridge population (cumulatively) for the 36 data samples over one year for two different participation levels. We sum high frequency response and the absolute value of low frequency response, in MWh. Negative results indicate that the other providers had to compensate for detrimental fridge behaviour. In both cases the population is homogeneous.

(a)  MW

(b)  MW