If a generator trip causes frequency to drop to 59.950 Hz and the Balancing Authority's Frequency Bias is 120 MW/0.1 Hz, how much MW would the system contribute initially?

To determine the initial contribution in megawatts (MW) by the system in response to a frequency drop, one needs to understand the relationship between frequency bias and frequency deviation. The frequency bias is a measure of how much generation a Balancing Authority (BA) is willing to add or reduce to maintain the system frequency. In this scenario, the frequency bias is given as 120 MW per 0.1 Hz.

The frequency has dropped to 59.950 Hz, which corresponds to a deviation of 0.050 Hz from a nominal frequency of 60 Hz. To find out how much generation the system will initially contribute, you calculate the response based on the frequency deviation and the frequency bias.

Using the frequency bias, we can determine the power contribution as follows:

1. Calculate the total frequency deviation in terms of percentage of the 0.1 Hz base:

[

\text{Frequency Deviation} = 60 \text{ Hz} - 59.950 \text{ Hz} = 0.050 \text{ Hz}

]

2. Given that the bias is 120 MW for each 0.1 Hz deviation, you can find the response for a 0.050 Hz