H6e - Hydro Turbine-Governor Model

Transcription

1 H6e - Hydro Turbine-Governor Model Represents digital governor logic supplied by American Governor Company, as now in service in many hydro plants in the Northwest Governor logic has been refined since h6b was developed, based on fuller information from manufacturer and on test work done by USACE and BPA Turbine model has been refined extensively so that characterizing curves can be produced directly from test measurements Power versus gate servo stroke Blade servo stroke versus gate servo stroke

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5 Typical value Name Description 163. tbase Turbine power base 0.05 re Permanent droop for electrical power feedback, pu 0.05 rg Permanent droop for gate position feedback, pu 0.2 tpe Electric power feedback transducer time const, sec tsp Shaft speed transducer time const, sec 0.00 fd Flag for proportional elec power signal 0 Speed control mode - droop is based on gate servo stroke 1 Load control mode - droop is based on electric power 3.3 kp Governor proportional gain 0.5 ki Governor integral gain 0.05 kd Governor derivative gain 0.05 td Derivative gain filter time constant, sec velm Maximum gate actuator velocity, pu/sec 1.00 gmax Maximum gate actuator stroke, pu 0.00 gmin Minimum gate actuator stroke, pu 0.1 buf Upper limit of gate buffer region buf Max gate closing rate in buffer region 3.0 kg Pilot servovalve gain 0.05 tg Pilot servovalve time constant, sec 0.0 blg Backlash in ring linkage 0.0 dbbd Deliberate sliding deadband in digital blade cam output 0.5 tbd Time constant of sliding deliberate dead band 0.0 blb Backlash in blade adjustment linkage 0.0 dbbs Mechanical deadband in blade servovalve/motor 3.0 tbs Blade servo time constant 0.4 bgvmin Flow area factor of blades when at minimum position blv Maximum stroking rate of blade servomotor 0.50 dturb Turbine speed sensitivity constant 0.2 pgc Electric motoring power with gates fully closed, per unit 0.00 deff Off blade angle power decrease factor hdam Operating head, pu 0.20 gv0 First abscissa value for wicket gate 0.32 gv1 and blade curves gv gv gv gv gv gv gv gv pgv0 Curve of wicket gate flow area pgv1 as function of gate servo stroke pgv pgv pgv pgv pgv pgv pgv pgv bgv0 Curve of Kaplan turbine blade flow area 0.00 bgv1 as function of gate servo stroke 0.00 bgv bgv bgv bgv bgv bgv bgv bgv tw water inertia time constant, sec 0.1 sprate speed-load setpoint adjustment rate

6 1 Power, pu Gate,Blade servo strokes, pu Gate, pu,

7 1 0.9 R- measured power, B- measured blade servo stroke Gate servo stroke, pu

8 1 0.9 R- measured power, B- set bgv to unity Gate servo stroke, pu

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10 Little Goose plant - USACE Speed Mode Played in synthetic speed disturbance Blue - test response Red - response simulated by h6e Speed (pu) Active Power (MW) Gate (pu) Blade (pu) Time, sec.

11 Little Goose plant - USACE Load Mode Played in synthetic speed disturbance Blue - test response Red - response simulated by h6e Speed (pu) Active Power (MW) Gate (pu) Blade (pu) Time, sec.

12 Recommendation Background H6b model turned out to be experimental Deduction of characterizing curves from test measurements was difficult Details of American Governor Company logic were incomplete Data management protocol is not consistent with emerging PSLF style Recommendation Either or Either way replace h6b/h6bd with h6e put h6e into the programs as an additional model recommend that h6b data records (if any) be replaced with h6e Status h6e C-code has been delivered to GE h6e definition has been delivered to PW, PTI h6e pseudo-code is ready to go to PW, PTI

13 h4e - Mechanical governor and same turbine model as h6e