Bài giảng Power system operation and control - Chapter 4: Unit commitment - Võ Ngọc Điều

• Human activity follows cycles

systems supplying services will also experience usage cycles

• transportation, communication, and electric power systems

* electric power consumption follows a daily, weekly, and scasonal cycles

• high power usage during the day and evening hours

industrial and commercial operations and lighting loads lower usage on the weekends

• higher usage during the summer and winter

greater temperature extremes Load cycles create economic problems for power generation

 • it is quite expensive to continuously run all generation, which

is needed to meet the peak power demands