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

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Import From Grid, Setpoints are 90% <strong>and</strong> 10% <strong>of</strong> Unit Rating, Choosing a Wrong<br />

Setpoint<br />

F<br />

1<br />

Utility<br />

System P<br />

1<br />

L<br />

1<br />

L<br />

2<br />

F<br />

2<br />

Event:<br />

Choice <strong>of</strong> Wrong<br />

Setpoint F<br />

2<br />

4 wire<br />

75yd<br />

P 2<br />

L 4 wire<br />

3<br />

L<br />

4<br />

25yd<br />

Event shows Unit 2 reaching zero output power after a choice <strong>of</strong> a wrong setpoint at Unit 2.<br />

Parallel Configuration, <strong>Control</strong> <strong>of</strong> F<br />

1<br />

<strong>and</strong> F<br />

2<br />

1<br />

A<br />

F = 0.22 pu<br />

2<br />

B<br />

F = 0.4 pu<br />

P [pu] 0.72 = 90% 0.72 = 90%<br />

P<br />

2<br />

[pu] 0.08 = 10% 0.0<br />

Frequency<br />

[Hz]<br />

60.00 60.00<br />

Load Level<br />

[pu]<br />

1.2 = 150% 1.2 = 150%<br />

Grid Flow<br />

[pu]<br />

0.4 = 50% 0.48 = 60%<br />

2<br />

Intermediate Bus (Load L<br />

3<br />

) Voltage, 200ms/div.<br />

205

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