Control and Design of Microgrid Components - Power Systems ...

Unit 1 controls F, Unit 2 controls P
Each test groups is configured as follows:
Import from grid:
− Unit 1 at 50% of its ratings, Unit 2 at 50% of its ratings – transfer to island
− Unit 1 at 10%, Unit 2 at 90% – transfer to island (i), usually Unit 2 reaches maximum output
− From this (i) island operating point, remove a load , this backs off the unit from maximum
output
− Again, from (i) reduce setpoint of Unit 2, this backs off the unit from maximum output
− Unit 1 at 90%, Unit 2 at 10% – transfer to island, usually Unit 1 reaches maximum output
Export to grid:
− Unit 1 at 50% of its ratings, Unit 2 at 50% of its ratings – transfer to island
− Unit 1 at 10%, Unit 2 at 90% – transfer to island, usually Unit 1 reaches zero output
− Unit 1 at 90%, Unit 2 at 10% – transfer to island (e), usually Unit 2 reaches zero output
− From this (e) island operating point, insert a load , this backs off the unit from zero output
− Again, from (e) increase setpoint of Unit 2, this backs off the unit from zero output
Every group has five experiments while importing and five while exporting. When at least one of
the units regulates feeder flow (all but the very first test group, series PP), then there are two
added experiments when importing from the grid:
− Unit 1 at 10%, Unit 2 at 90% - the unit regulating F is switched to a wrong setpoint that will
determine either max or zero power output.
− Unit 1 at 90%, Unit 2 at 10% - the same unit regulating F is switched to a wrong setpoint that
will determine max (if before it was zero) or zero (if before it was max) output.
If both units are regulating F, then one unit is arbitrarily picked up to test the wrong setpoint
feature.
In summary, in each test group the experiments will be carried in the order shown in Table 7.1.
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