1. Edit Curves
Select curve to edit, then drag points on the chart:
Currently editing: Load
2. Generation Units & Characteristics
Coal
Coal Total Capacity: 20%
Nuclear
Nuclear Total Capacity: 10%
CCGT Natural Gas
CCGT Total Capacity: 10%
Gas Turbine
Gas Turbine Total Capacity: 10%
Scenario Presets
Ramp Rate Analysis
Move the slider to see how generation ramp rates change throughout the day. Only generation with available capacity can ramp up.
Generation Ramp Rates at Selected Time
Detailed Ramp Rate Calculations
Net Load Ramp Rate: 0 MW/min
Ramp Rate Calculations
For each generator type:
\[ \text{Total Ramp Rate} = \text{Units} \times \text{Capacity} \times \text{Ramp Rate} \]
\[ \text{Ramp (MW/min)} = n \times \left(\frac{\text{Cap}}{100} \times \text{Load}\right) \times \left(\frac{\text{Rate}}{100}\right) \]
Where:
- \( n \) = Number of units
- \( \text{Cap} \) = Unit capacity (% of peak)
- \( \text{Rate} \) = Ramp rate (%/min)
Available ramp rate is limited by:
\[ \text{Ramp Up} = \min\left(\text{Total Ramp}, \frac{\text{Avail. Cap.}}{10}\right) \]
\[ \text{Ramp Down} = \min\left(\text{Total Ramp}, \frac{\text{Output}}{10}\right) \]
Duck curve ramp rate challenge:
\[ \text{Net Load Ramp} = \frac{d(\text{Load} - \text{Solar} - \text{Wind})}{dt} \]
\[ \text{System Capability} = \sum_{i} \text{Ramp}_i \]
\[ \text{Constraint Violation if: } |\text{Net Load Ramp}| > \text{System Capability} \]
Duck Curve Ramp Rate Analysis
The duck curve presents two key challenges:
- Morning Downward Ramp: As solar generation increases in the morning, thermal generators must ramp down: \[ \text{Morning Down} = \frac{d(\text{Solar})}{dt} \]
- Evening Upward Ramp: As solar generation decreases in the evening, thermal generators must ramp up: \[ \text{Evening Up} = \frac{d(-\text{Solar})}{dt} \]
The system's ability to handle these ramps depends on:
- Number of flexible generation units available
- Individual unit ramp rates (% capacity/minute)
- Available headroom (for upward ramps) or footroom (for downward ramps)
The table shows detailed calculations for each generator type. Available ramp rates are limited by current output and available capacity.
Renewables (Total Installed Capacity as % of Peak Load)
4. Dispatch Prices ($/MWh eq.)
Adjust prices to influence economic dispatch order.