SOPD Load Forecasting & Energy Scheduling

Question 1

Which weather variable is MOST influential for day‑ahead electric load forecasting in temperate climates?

Accepted Answer

Ambient temperature

Answer

Ambient temperature is the most influential weather variable for day-ahead electric load forecasting because it directly drives heating and cooling demands. In temperate climates, a significant portion of electricity consumption is attributed to HVAC systems, which respond strongly to temperature fluctuations. High temperatures increase air conditioning usage, while low temperatures increase heating, making temperature the primary determinant of daily load shapes.

Question 2

The load duration curve plots:

Accepted Answer

Ranked load levels versus percent of time

Answer

The load duration curve is a graphical representation that plots all observed load levels over a specific period, sorted from highest to lowest, against the percentage of time each load level was met or exceeded. This curve is crucial for generation planning, as it illustrates how long different magnitudes of demand persist, aiding in the optimal selection and scheduling of various types of generating units.

Question 3

Which statistical technique is commonly applied to model linear relationships between load and explanatory variables?

Accepted Answer

Multiple linear regression

Answer

Multiple linear regression is a statistical technique widely used in load forecasting to model the linear relationship between electric load (the dependent variable) and several explanatory variables, such as temperature, time of day, and historical load data. It allows forecasters to quantify how changes in these independent variables impact electricity demand, providing a robust and interpretable model for prediction.

Question 4

Unit commitment in energy scheduling primarily determines:

Accepted Answer

Which generators are started or shut down to meet forecasted demand

Answer

Unit commitment is a critical optimization problem in power system operations that determines which generating units should be started up, shut down, or kept online over a future period (e.g., 24-48 hours). Its primary goal is to meet the forecasted electricity demand reliably and economically, considering operational constraints and startup/shutdown costs.

Question 5

Spinning reserve is scheduled to:

Accepted Answer

Respond to sudden contingencies

Answer

Spinning reserve refers to generating capacity that is synchronized to the grid and ready to increase its output immediately. It is specifically scheduled to quickly respond to sudden, unexpected events like the trip of a large generator or a sudden increase in load, thus maintaining system frequency and reliability.

(SOPD) System Operator/Power Dispatching Practice Test

(SOPD) System Operator/Power Dispatching Practice Test

SOPD Load Forecasting & Energy Scheduling