Modelling a Synchronous Generator to estimate the droop constants

I am trying to model a synchronous generator so that I can get the droop coefficients. The inpts to the SG are load change and the measurable Otpts are FreQ,V and I.Any ideas on how to about it? Matlab or Simulink ideas are welcome

[Adarsh]

@SIRENGO Could you please describe the exact expectation that you are having, are you looking for a way to estimate the parameters with given data and model or looking help for building the Synchronous Generator model itself?

Answer 1

[Anushka]

Hi @SIRENGO,

To model a synchronous generator and determine the droop coefficients in Simulink, you can follow these steps:

1. Open Simulink and choose a blank model for your design.

2. Open Simulink library browser:

1. From Simscape > Electrical > Specialized Power Systems > Machines , add Synchronous Machine block
2. Add the Three-Phase RLC Load from Simscape > Electrical > Specialized Power Systems > Elements.
3. Add Voltage Measurement, Current Measurement and Frequency Measurement block from ‘Measurements’ library to monitor terminal voltage, current and system frequency.
4. Go to Simulink > Sinks to insert
5. From Simulink > Signal Routing, we can incorporate the bus selector.
6. Insert the Powergui from Simscape > Electrical > Specialized Power Systems > Utilities

3. To design the Synchronous Generator:

1. For a standalone generator, connect the Synchronous Machine output directly to the Three-Phase RLC Load.
2. If modelling a grid connection, connect the Three-Phase Source to the Synchronous Machine via the Transformer.
3. Attach the Measurement blocks at appropriate points.

4. Configure each block with appropriate parameters.

5. Go to Simulation > Model Configuration Parameters and select a suitable solver.

6. Vary the load on the Three-Phase RLC Load to simulate load changes.

7. Click the Run button to execute the simulation.

8. To measure the outputs:

1. Use the ‘Frequency Measurement’ block to obtain the frequency response.
2. Use ‘Voltage Measurement’ and ‘Current Measurement’ blocks for terminal voltage and current.
3. Visualize the results using ‘Scope’.
4. To determine the droop coefficients, plot the steady-state frequency versus load and calculate the slope.

You can refer to the following documentation to know more about the various ‘Simscape Electrical’ libraries used: https://www.mathworks.com/help/sps/index.html?s_tid=CRUX_topnav

Hope this helps!