Industrial gas turbine power plant control system and method implementing improved dual fuel scheduling algorithm permitting automatic fuel transfer under load
United States Patent 1 1 Rankin 1 1 Apr. 1, 1975 [73] Assignee: Westinghouse Electric Company, Pittsburgh, Pa.  
  22 Filed: Feb. 14,1973  
  2| App1.No.:332,457  
  Related US. Application Data [63] Continuation of Ser. No. 204,944, Dec. 6, 1971,  
 abandoned.  
 [52] US. Cl 23S/I5l.1, 444/1, 60/204, 235/15L21 1511 Int. Cl G05b 15/00, F23n 1/00 158] Field ofSearch ..235/l5l.21,151.1;444/1; 60/204; 290/40 R [56] References Cited UNITED STATES PATENTS 3.400.374 6/1968 Schumann 340/1 72.5  
 FLAME &#34;a COMBUS&#39;OR RESSURE SENSOR BLADE PATH T SENSORS VIBRATION XHAUS DISC CAVITY T CONSOLE KWNARS V SENSORS AIR T SENSORS FROM PLANT B FROM PL ANT 8 OTHER PUBLICATIONS Application of the Prodac 50 System to Direct Digital Control: .1. C. Belz, G. .1. Kirk, P. S. Radcliffe; 1965 IEEE. lntl. Conv. Rec., Part 3, pp. 102-122. Monitoring and Automatic Control in Steam Power Stations by Process Computers; E. Doetsch &amp; G. l-lirschberg; Siemens Review, XXXV, (1968) No. 12, pp. 471-476.  
 Primary Examiner-Eugene G. Botz Assistant Examiner-Edward 1. Wise Attorney, Agent, or Firm-S. A. Seinberg [57] ABSTRACT A gas turbine power plant is provided with an industrial gas turbine capable of sustained operation on either gas or liquid fuel, or a mixture of the two. One or more of such turbine-generator plants are operated by a hybrid digital computer control system during all turbine operating modes. Improved dual fuel control algorithm facilitates optimum computer control of fuel subsystems to achieve uninterrupted operation during transitions from operation on one fuel to operation on another or to operation on a mixture of the two fuels.  
 11 Claims, 41 Drawing Figures SPEED CONTROL OUTPUT 5 Y5 TEM TO PLANT B CENTRAL OCE INTER SYSTEM PRINTER POWER FOR CONTROL 8 315 DEVICES PATENIEDAPR&#39; ums SE&#39;LEEI PATENTEDA R H saw our 33 &#34;875.380  
 FIG. 6  
 FHENTEB APR I i975 SHEET CBGF 33 Em r APR H975 SHEET 130! 33 vARS SEN, FREQ D.C.FLD. 0.0. FLD. RUN BUS INC. GEN. TEMP AMPS. voLT VOLT VOLT 526 52s SYNC- GEN. BKR. GEN. BKR SYNC OFF TRIP CLOSE LOAD 3265 iZI R MA L&#34; 532115 SYSTEM RAI E SE Low R START START START RESERV&#34; 7 a 9 IO II I2 l3 I4 I5 I6 FIG. I6A  
 voLT voLT REG. REG. RAISE LowER MANUEL AUTO.  
 OFF  
  52L 52L 0N SYNC. LINE LINE SYNC.  
 OFF BKR. BKR. ON  
 TRIP CLOSE l8 I9 2I 23 24 25 25 2? 2e 29 30 I TURBINE TURBINE READY MASTER AUX. TO LUBE TURNING LUBE AUx TRIP TO CONTROL PUMP PRESS GEAR PRESS RESET RESET START ON ON 63 PS4 ON 53 PSI L J \O l WATTS I PATENTEUMR U975 73. 87 5 38D SHEET 1 t [If 33 AUTO MANUEL SYNC. SYNC. SYNC. SYNC. LIGHT LIGHT H G &#39;68 SELECT 1 SELECT lNDlC. DEV  
 HOLD so 3| 32 33 34 6| s2 s3 s4 START 03v 0 s FLAME FLAME START DEVICE TRIP TRIP FUEL COMB, COMB. 05v ON VALVE PRESS ON ON 6 7 OFF PATENTEDAPR H975 SHEET 1 5 [1F 33 [vOLTs AMPS FUEL DISC EXHA BLADE OONT. CAV TEMR TEMP TURBINE TURBINE NORMAL EMERG. STOP sTART TURBINE ALARM $5,; SHUT- HORN ALARM LAMP ALARM DOWN SILENCE REsET TEsT ALARM 45 4s 47 4s 49 5O 52 53 54 55 FIG 6C GAS GAS OIL FUEL FUEL FUEL LOW GAS ONLY ONLY PRES. MIX  
 TRANsF GAS TURB LOCAL REMOTE Tg Ag sg DEMAND EMERGENCY CONTROL CONTROL REViEW NORMAL STOP as 67 68 69 TI 72 AUX 4| BLEED GEN PUMP FLD. vALvE gg g- BKR. OFF DKR CLOSED 52 G.  
  E IIPII H975 3 87 SHEET 170F133 ANALOG INPUTS I I l /7I4 RESIDENT LocAL CONTROL A B c D TURB&#39;NE CONTROL DATA TABLES CONTROL DATA AREA POST- PROCESS FIG. 22 i 2&#39;. ANALOG INPUTS STORE IN USE STORED DATA 3. TURBINE TABLE MASTER LOGIC To EvALuATE o. RESIDENT TABLE sEouENcE LOGIC b. OPERATOR PANEL INPUTS 628 SAVE $30 632 OUTPUT RESIDENT LAST cco s TURBINE TURBINE TABLE I ATENTEB H915 3.875.380 SHEET 18BF 33 ANALOGS CCI&#39;S 634 PRE- PROCESSOR I 1 I I r Y 638 I I 63 F TURBO TURB. c TURB. B TURB. A  
 RESIDENT RESIDENT RESIDENT RESIDENT LOGC ggf TABLE TABLE TABLE TABLE PROGRAM TABLE READ ONLY READ ONLY READ ONLY READ ONLY I I I I I I v I I f l I 1 e40 POST- \i OPERATOR PROCESSOR PANEL I PROGRAMS I CCO&#39;S FIG. I9  
 PMENTEDAPR H975 MEET 183F33 Om OE