Handbook of Electrical Engineering

40 HANDBOOK OF ELECTRICAL ENGINEERING which may be represented by a simple linear function, ω=ωo−kT ( 2. 47 ) wherekis a positiv ...

GAS TURBINE DRIVEN GENERATORS 41 Table 2.5. Open-loop steady state speed-power characteristic of a gas turbine (k= 0 .1) Shaft p ...

42 HANDBOOK OF ELECTRICAL ENGINEERING Figure 2.12 Open-loop speed regulation of a gas turbine. where Pe=F(ωo−ω) ( 2. 54 ) andωoi ...

GAS TURBINE DRIVEN GENERATORS 43 In (2.53) and (2.54) letωbe increased byωand P byP, and subtract the predistur- bance state, ...

44 HANDBOOK OF ELECTRICAL ENGINEERING Droop governing requires a steady state error in speed to create the necessary feedback co ...

GAS TURBINE DRIVEN GENERATORS 45 Figure 2.13 Basic control system block diagram of a gas turbine. The diagram represents the mai ...

46 HANDBOOK OF ELECTRICAL ENGINEERING and b= 1 fo ∑i=n i= 1 Gi Di is also a constant (2.68) (2.65) and (2.66) represent the over ...

GAS TURBINE DRIVEN GENERATORS 47 setting must be reduced from 102.4% (61.44 Hz) to 101.6% (60.96 Hz) i.e. the same as that of Ge ...

48 HANDBOOK OF ELECTRICAL ENGINEERING Similarly for generators Nos. 2 and 3, fz 2 = 61 .6Hzandfz 3 = 61 .5Hz Step 2. The common ...

GAS TURBINE DRIVEN GENERATORS 49 For generator No. 1, the ratioK 1 of its new load to its rating is, P 1 +P 1 G 1 =K 1 Similarl ...

50 HANDBOOK OF ELECTRICAL ENGINEERING Similarly for generators Nos. 2 and 3, fz 2 =61.411 Hz andfz 3 =61.951 Hz Step 7. Find the ...

GAS TURBINE DRIVEN GENERATORS 51 The constantsDi,Giandfocan be incorporated into the controller as potentiometer adjust- ments, ...

52 HANDBOOK OF ELECTRICAL ENGINEERING Block 1 in Figure 2.15 contains most of the main control and turbine functions, such as, a ...

GAS TURBINE DRIVEN GENERATORS 53 Figure 2.16 Control system for the speed governing of a single-shaft gas turbine. Figure 2.17 C ...

54 HANDBOOK OF ELECTRICAL ENGINEERING The main functions are:- Summation of electrical and mechanical power. Acceleration of th ...

GAS TURBINE DRIVEN GENERATORS 55 The ‘inertia constantH’ is a constant used in electrical engineering to relate the actual momen ...

56 HANDBOOK OF ELECTRICAL ENGINEERING 2.6.1.4 Power amplifier Power amplification is necessary in order to develop sufficient po ...

GAS TURBINE DRIVEN GENERATORS 57 Figure 2.18 Simulation of slewing of the fuel valve by using an exponential approximation. inte ...

58 HANDBOOK OF ELECTRICAL ENGINEERING 2.6.1.8 Combustion and turbine dynamics After the fuel valve moves from one position to an ...

GAS TURBINE DRIVEN GENERATORS 59 power has a part that is delayed when a disturbance occurs. It is generally considered that two ...