lecture14- Control of Generation

lecture14- Control of Generation - EEL 6266 Power System...

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Unformatted text preview: EEL 6266 Power System Operation and Control Chapter 9 Control of Generation 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 2 Tie-line Model c The power flow across a tie-line can be modeled using a linear load flow approach r steady-state or nominal flow quantity: r deviation from the nominal tie-line flow c where must be in radians for P tie to be in per unit r using the relationship for speed and : then c where T = 377 / X tie for a 60-Hz system ( 29 2 1 flow tie 1 - = tie X P ( 29 ( 29 [ ] ( 29 ( 29 ( 29 2 1 flow tie 2 1 2 1 2 2 1 1 flow tie flow tie 1 1 1 - = - +- = +- + = + tie tie tie X P X X P P = s ( 29 ( 29 2 1 2 1 flow tie - = - = s T X s P tie 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 3 Tie-line Model c Simplified control for two interconnected areas 1 1 1 G T s + 1 P mech 1 + _ + _ 1 1 R P ref-1 1 1 1 CH T s + 1 1 1 D s M + load reference set points 2 1 1 G T s + 2 P mech 2 P L 2 + _ + _ 2 1 R P ref-2 2 1 1 CH T s + 2 2 1 D s M + governors prime movers P L 1 _ + + _ s T P tie 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 4 Tie-line Model c Consider two areas each with a generator r the two areas are connected with a single transmission line r the line flow appears as a load in one area and an equal but negative load in the other area r the flow is dictated by the relative phase angle across the line, which is determined by the relative speeds deviations r let there be a load change P L 1 in area 1 r to analyze the steady-state frequency deviation, the tie-flow deviation and generator outputs must be examined 2002, 2004 Florida State University EEL 6266 Power System Operation and Control 5 Tie-line Model r after the transients have decayed, the frequency will be constant and equal to the same value in both areas r applying substitutions yields ( 29 ( 29 2 2 mech 2 tie 2 mech 1 1 mech 1 1 tie 1 mech 2 1 2 1 d d d d R P D P P R P D P P P t t L - = = + - = = - - = = = = ---- + = + +...
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lecture14- Control of Generation - EEL 6266 Power System...

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