improve reliability and training of power plant electrical ...cnd v p 1b cooling water to rst lphdp...

Improve Reliability and Training of

Power Plant Electrical Distribution System Operation by

Dynamic Load-Flow Simulation

By Sadashiva Godbole, et. al.

nHance Technologies, Lynchburg, Virginia, USA 828 Main Street

Suite #903 Lynchburg, VA 24504

Phone: (434) 582-6110, Ext. 16

Fax: (434) 582-6112 e-mail: [email protected]

Power Plant Electrical Distribution System A typical three-phase electrical distribution system in a power plant consists of one or more synchronous generators interconnected with each other and connected to the electrical power grid and several house loads through busses at different voltages and interposing transformers. The house loads include 3-phase induction motors for components such as boiler feedwater pumps, circulating water pumps, condensate pumps, air and gas fans, coal pulverizer mills, (reactor coolant pumps for nuclear plants). Electric current limiting reactors may be used for interconnecting generators and grid. Circuit breakers are included in the system to change network configuration under normal and fault conditions (e.g., synchronizing a generator, changing load bus power supply from startup supply to plant auxiliary supply, adding or dropping a load, protecting connected equipment). Dynamic Load Flow Simulation Dynamic load flow simulation is a necessary component in a power plant operator training simulator. It is used to train the operator in following the procedures for tasks such as

• Synchronizing generators, • Properly sequencing large motor startup to prevent trips due to large inrush

currents and temporary voltage drop, • Switching power supply path for load busses (e.g., grid to in-house), • Switching speeds of multi-speed induction motors, and • Monitoring generator stability margin via load angle during operation.

Dynamic load flow simulation is also valuable for developing system operating procedures and verifying plant control system and equipment upgrades. It can play an important role in familiarizing electrical power staff and engineering students with various aspects of the power plant electrical distribution system and component dynamics. During dynamic load flow simulation, the voltages and currents, active and reactive power, and other parameters throughout the power plant electrical distribution system are dynamically calculated and displayed under changing system configuration caused by operation of circuit breakers. Through the HMI (Human-Machine Interface), the simulation allows virtual “hands-on” and “on-the-fly” operation of the system to verify

• Synchronizing and loading/unloading of the generators, • Assignment of loads to busses, • Continuity of power supply to critical loads, • Settings of protective relays and frequency and voltage regulators.

This virtual hands-on, on-the-fly aspect of the dynamic simulation described here provides increased insights into the electrical system use and behavior over what may be achieved from a typical load flow analyses. Modular Modeling System The dynamic load flow model and simulation described in this paper are developed by using MMS (Modular Modeling System1). MMS is a graphical software system for developing simulation of power plant dynamics. It includes graphical icons that correspond to pre-engineered software modules of power plant components (e.g., boiler, steam generator, reactor, pumps, fans, valves, pipes, tanks, heat exchangers, turbine, and condenser) that can be selected and connected to represent a power plant system. Electrical modules include synchronous generators, two- and three-winding transformers, one- and two-speed induction motors, reactors, circuit breakers, busses, and others. The generator module uses saturation characteristics and “V curves” supplied by the generator manufacturer to determine the pre- and post-synchronization induced voltage and expected excitation current. The 3-winding transformer module uses the impedance data supplied by the transformer manufacturer to determine the reactance of the windings. The induction motor module uses the nameplate data and motor efficiency to calculate the stator and rotor resistance and reactance. Control logic modules corresponding to control functional blocks (e.g., PID, Hi/Lo alarm, set/reset, AND, OR) are also available. Another software tool permits the user to develop custom modules. The load flow solution is based on first principles; i.e., on the fact that all current vectors (voltage/impedance) entering a node must add up to zero. MMS simulation tools also includes HMI and hard panel emulation to mimic control room displays, dials and gauges, switches, push buttons, indicator lights, and other

1 MMS is developed and distributed by nHance Technologies.

control/instrumentation animation. Tools for generating trends of any simulator variable and for monitoring/changing parameters on-line are also available. Control logic and HMI translators for several DCS (e.g., ABB-Bailey, Westinghouse, Honeywell, …) are also supported. MMS employs an easy-to-use and efficient graphical drag-and-drop procedure for configuring the system to be simulated. An extensive on-line help system is available. MMS is also used to provide or upgrade the electrical system models for simulators based on third-party platforms. Procedure for Developing a Dynamic Load Flow Simulation The electrical system simulation development starts with identifying portions of the one-line diagram of the electrical distribution system to define the scope of the simulation, i.e., what is to be included in the simulation model and what part of system operation is to be simulated. The next step is to select the MMS modules from the on-line list and connect them according to the one-line diagram. Each icon typically has an input data form for specifying the attributes of the component, e.g., rated voltage, current, power factor, impedance, horsepower, speed, moment of inertia. The data is next entered in US or SI units. The units can be readily toggled by a mouse click. The simulation model is then built by clicking the “Build Model” button. The model can be executed in two ways: verification and analysis, and real-time on-the-fly interaction. In the verification and analysis mode, the model is executed by a combination of on-line and pre-built commands. In the real-time mode, the model is executed from the HMI as the actual system is operated in the plant. Example Dynamic Load Flow Model The example load flow simulation pertains to the power plant electrical distribution system (see Figures 1 and 2) described next. As shown in the one-line diagram of Figure 1, the system consists of a 618 MVA, 0.9 pf, 22 kV generator connected to the 230 kV grid bus through a 620 MVA step-up transformer, and connected with two 4.16 kV station service busses through a 18-30 MVA 3-winding step-down transformer. These busses receive startup power from the grid through another 24-40 MVA 3-winding step-down transformer when the generator is off-line. Major loads on the station service busses (8 motors totaling 9000 hp on bus 1A and 9 motors totaling 11800 hp on bus 1B) are shown in the one-line diagram of Figure 2.

Figure 1. One-line diagram of generator and busses

Figure 2. One-line diagram of major loads on busses

The MMS simulation model schematic is shown in Figure 3. One of the HMI screens (plant one-line) is shown in Figure 4, while the hard panel emulations featuring the synchroscope and startup loads are shown in Figures 5 and 6.

ACSL integration in gen MMS integration in motors. Layout per 2839-1ES-1. !G1 can be synchronized by 1927 (normal) or 1928. !The breaker selected for synchronizing is slaved to breaker G2R !If either 1927 or 1928 are closed, sync status Lsync_G1 is true

21 kV

230 kV

tc_gen

GRID Bus 1 0

-2

1

bus, component dummy bus Leg macro or Label N_bus connections

1 0

n_bus

1 GB

4.16 kV

EGLOBAL 1

480 V 480 V

4.16 kV

480 V

230 kV GRID Bus 2

3 230 kV

2 230 kV

230 kV 4 230 kV PL3

230 kV modified csl

TO Fuel Oil Burner Pump 1A TO FD FAN 1A

TO FD FAN 1B

TO LPHDP 1B

Fuel Oil bus

480v bus 1A-1B

480 1B

4160 V bus 1A 4160 V bus 1B

480v Plant Service Bus

1 Gen G1

TO CND V P 1B

TO LPHDP 1A

480 1A

TO Cooling Water Pump 1A TO CND V P 1A TO CND XFER PUMP

4.16 kV 4.16 kV

4.16 kV 4.16 kV

4.16 kV

480 V 480 V 480 V

480 V 480 V 480 V 480 V

480 V 480 V

480 V 480 V

TO Fuel Oil Burner Pump 1C

TO Service Air Comp 3


TO Dilution Pump 1A TO Circ Water

Pump 1A TO Boiler Circ Pump 1A TO Boiler Circ Pump 1C TO Condensate Pump 1A TO Gas Recirc Fan TO Condensate Pump 1B TO Boiler Circ Pump 1B TO Boiler Circ Pump 1D TO Circ Water Pump 1B TO Circ Water Pump 1C TO Dilution Pump 1B TO Fuel Oil Burner Pump 1B TO

Fire Pump

TO Aux Oil Pump 1A TO Aux Oil Pump 1B TO Cooling Wtr Pump 1C

TO Fuel Oil Booster Pump 1A TO Fuel Oil Booster Pump 1B TO Fuel Oil Booster Pump 1C

TO Cooling Wtr Pump 1B

Ignitor Oil Pump 1B

Seal Air Fan F.O. Additive Meter Pump GRF TG

I.A. Comp 3

I.O. Pump 1A WU Oil Pump FDF 1A LOP A FDF 1A LOP B FDF 1B LOP A FDF 1B LOP B

I.A. Comp 2

WPP 1 WPP 2

Gen Stator Cooling Pump 1A Turbine TG Motor Turbine TG Oil Pump Gen Leads Cooling Fan 1A HPH Drain

Pump 1A BFP 1A Trb TG Motor BFP 1A Trb Main Oil Pump A BFP 1B Trb Main Oil Pump A BFP Seal Water Inj Pump 1B Service Water Pump 1 Air Pre-heater 1A Cond Vac Priming Pump 1A

Gen Stator Cooling Pump 1B Gen Leads Cooling Fan 1B HPH Drain

Pump 1B BFP 1B Trb TG Motor BFP 1B Trb Main Oil Pump B BFP 1A Trb Main Oil Pump B Service Water Pump 2 Cond Vac Priming Pump 1B

modified csl

480 V

480 V

modified csl modified csl modified csl

modified csl modified csl

operated from control room operated from control room operated from control room

Air Pre-heater 1B

modified csl


EXC Ji1 Ji2 Ji3 Ji4 EMF G1

IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3

OUT2 OUT1 GI

EIN1 EIN2 EIN3 EIN4 EIN5 EOUT10 EOUT9 EOUT8 EOUT7 EOUT6 EOUT5 EOUT4 EOUT3 EOUT2 EOUT1 out GB

EIN1 EIN2 EIN3 EIN4 EIN5 EOUT10 EOUT9 EOUT8 EOUT7 EOUT6 EOUT5 EOUT4 EOUT3 EOUT2 EOUT1 out 230_1

IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 GR1

OPN POS

EOUT EIN CLS TRP RST 1927 IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 TX

OPN POS

EOUT EIN

CLS TRP RST BLPHDP1B

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 480_1BM

OPN POS

EOUT EIN CLS TRP RST 1111 OPN POS EOUT EIN CLS TRP RST 1112

PRIe SECL PRIL SECe GSU

IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4

OUT3 OUT2 OUT1 UBND

OUT IN TO_PS1_TRB

OUT IN TOLPHDP1B

OUT1 OUT2 IN1 IN2 DCS_CONVERSIONS

OUT IN TO_PS1_TG

Lin Rin Lm1 Rm1 Lm2 Rm2 1A

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 SS1AM

PRI SEC1 SEC2 SU

Lin Rin Lm1 Rm1 Lm2 Rm2 480_1AB

PRIe SECL PRIL SECe SS1AX

OPN POS

EOUT EIN CLS TRP RST 1113

OPN POS


OPN POS

EOUT EIN CLS TRP RST 1211 OPN POS EOUT EIN CLS TRP RST 1212 Lin Rin

Lm1 Rm1 Lm2 Rm2 1B

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 SS1BM

PRIe SECL PRIL SECe SS1BX1

OPN POS

EOUT EIN CLS TRP RST 1213 OPN

POS EOUT EIN CLS TRP RST 1221

OPN POS

EOUT EIN CLS TRP RST BFDF1A OUT IN TOFDF1A

OPN POS

EOUT EIN CLS TRP RST BFDF1B Lin Rin

Lm1 Rm1 Lm2 Rm2 480_PS

PRIe SECL PRIL SECe SU1AX

OPN POS


E

OUT IN TOFDF1B

OPN POS


EIN1 EIN2 EIN3 EIN4 EIN5 EOUT10 EOUT9 EOUT8 EOUT7 EOUT6 EOUT5 EOUT4 EOUT3 EOUT2 EOUT1 out 230_2

IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 GR2

EIN1 EIN2 EIN3 EIN4 EIN5 EOUT10 EOUT9 EOUT8 EOUT7 EOUT6 EOUT5 EOUT4 EOUT3 EOUT2 EOUT1 out PL3

RXp RXs RX1 RXp

RXs RX2 OPN


OPN POS

EOUT EIN CLS TRP RST BFOBP1A OPN POS EOUT EIN CLS TRP RST BCWP1A OUT IN TOCWP1A OUT IN TOFOBP1A

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 PSM

OPN POS

EOUT EIN

CLS TRP RST BAOP1A OPN POS

EOUT EIN

CLS TRP RST BAOP1B

OPN POS



OUT3 OUT2 OUT1 PB

Lin Rin Lm1 Rm1 Lm2 Rm2 SS1A

OPN POS

EOUT EIN CLS TRP RST 1116 IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10

OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 DG1 IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4

OUT3 OUT2 OUT1 DG_AUX

RXp RXs RXD

OPN POS

EOUT EIN CLS TRP RST 1115 IN

O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 SS1B

Lin Rin Lm1 Rm1 Lm2 Rm2 480_FO

PRIe SECL PRIL SECe SS1BX2

OPN POS


OPN POS


OPN POS


IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 U2_FO

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 SU1B

OPN POS

EOUT EIN

CLS TRP RST BSAC3 OPN POS

EOUT EIN

CLS TRP RST BFP

JiNo PWR MSAC3 JiNo

PWR MFP

OPN POS


POS EOUT EIN CLS TRP RST 2320 IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10

OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 U2_PS IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4

OUT3 OUT2 OUT1 480_PSL

OPN POS

EOUT EIN

CLS TRP RST BCDWP1C

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 480_1BLOAD

OPN POS


POS EOUT EIN

CLS TRP RST BCVP1B

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 480_1ALOAD

OPN POS

EOUT EIN

CLS TRP RST BLPHDP1A

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 480_1AM

OUT IN TOLPHDP1A3

OPN POS

EOUT EIN

CLS TRP RST BCDWP1A

OUT IN TOCDWP1A

OPN POS

EOUT EIN

CLS TRP RST BCVP1A

JiNo PWR MCVP1A

OPN POS

EOUT EIN

CLS TRP RST BCXP

OUT IN TOCXP

Lin Rin Lm1 Rm1 Lm2 Rm2 ES

OPN POS


OPN POS

EOUT EIN CLS TRP RST 1128 Lin Rin

Lm1 Rm1 Lm2 Rm2 IH OPN


OPN POS

EOUT EIN CLS TRP RST BWTR

IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 U2_WT

OPN POS

EOUT EIN CLS TRP RST BIHR

IN1 IN2 IN3 IN4 IN5 IN6 IN7 IN8 IN9 IN10 OUT10 OUT9 OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 OUT2 OUT1 U2_IH

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 1BA

OPN POS

EOUT EIN

CLS TRP RST BSAF OPN POS EOUT

EIN CLS TRP RST BFOAMP OPN POS

EOUT EIN

CLS TRP RST BGRFTG

EIN ZL_SAF EIN ZL_GRFTG EIN ZL_FOAMP

OPN POS


IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 1TAA

OPN POS

EOUT EIN

CLS TRP RST BGSCP1A OPN POS

EOUT EIN

CLS TRP RST BTTGM OPN POS

EOUT EIN

CLS TRP RST BTTGOP OPN POS EOUT

EIN CLS TRP RST BGLCF1A OPN POS EOUT

EIN CLS TRP RST BHPHDP1A OPN POS EOUT

EIN CLS TRP RST BBFP1ATTGM

EIN ZL_GSCP1A EIN ZL_TTGOP EIN ZL_GLCF1A EIN

ZL_HPHDP1A EIN ZL_BFP1ATTGM

OPN POS


EIN ZL_TTGM

OPN POS

EOUT EIN

CLS TRP RST BBFP1ATMOPA

EIN ZL_BFP1ATMOPA

OPN POS

EOUT EIN

CLS TRP RST BBFPSWIP1B

EIN ZL_BFPSWIP1B

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 1TAA1

OPN POS

EOUT EIN

CLS TRP RST BAPH1A OPN POS EOUT

EIN CLS TRP RST BCVPP1A

EIN ZL_APH1A EIN ZL_CVPP1A

OPN POS

EOUT EIN CLS TRP RST 1122A

OPN POS

EOUT EIN

CLS TRP RST BBFP1BTMOPA

EIN ZL_BFP1BTMOPA

OPN POS

EOUT EIN

CLS TRP RST BSWP1

EIN ZL_SWP1

OPN POS

EOUT EIN

CLS TRP RST BIOP1B

EIN ZL_IOP1B

OPN POS

EOUT EIN

CLS TRP RST 2422

JiNo PWR MAOP1A JiNo PWR MCDWP1C

OUT IN TOCDWP1C

JiNo PWR MFOBP1A

OPN POS

EOUT EIN CLS TRP RST BFOBP1C OUT IN TOFOBP1C

JiNo PWR MFOBP1C

OPN POS

EOUT EIN

CLS TRP RST BSAC1

JiNo PWR MSAC1

JiNo PWR MDP1A

OUT IN TODP1A

JiNo PWR MCWP1A

OPN POS

EOUT EIN CLS TRP RST BBCP1A JiNo PWR

MBCP1A OUT IN TOBCP1C

JiNo PWR MBCP1C

OPN POS

EOUT EIN CLS TRP RST BCP1A OUT IN TOCP1A

JiNo PWR MCP1A OPN POS EOUT

EIN CLS TRP RST BGRF

OUT IN TOGRF

JiNo PWR MGRF

OPN POS

EOUT EIN CLS TRP RST BCP1B OUT IN TOCP1B

JiNo PWR MCP1B

OPN POS

EOUT EIN CLS TRP RST BBCP1B OUT IN TOBCP1B

JiNo PWR MBCP1B

OPN POS

EOUT EIN CLS TRP RST BBCP1D OUT IN TOBCP1D

JiNo PWR MBCP1D

OPN POS

EOUT EIN CLS TRP RST BCWP1B OUT IN TOCWP1B

JiNo PWR MCWP1B

OPN POS

EOUT EIN CLS TRP RST BCWP1C OUT IN TOCWP1C

JiNo PWR MCWP1C JiNo PWR

MDP1B OPN

POS EOUT EIN

CLS TRP RST BDP1B

OUT IN TODP1B

OPN POS

EOUT EIN CLS TRP RST BFOBP1B OUT IN TOFOBP1B

JiNo PWR MFOBP1B

JiNo PWR MLPHDP1B

JiNo PWR MLPHDP1A

OPN POS

EOUT EIN

CLS TRP RST B1AFOBP

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 480_FOM

OUT IN TO1AFOBP

JiNo PWR M1AFOBP

OPN POS

EOUT EIN

CLS TRP RST B1BFOBP

OUT IN TO1BFOBP

JiNo PWR M1BFOBP

OPN POS

EOUT EIN

CLS TRP RST B1CFOBP

OUT IN TO1CFOBP

JiNo PWR M1CFOBP

OPN POS

EOUT EIN

CLS TRP RST BCDWP1B

JiNo PWR MCDWP1B

OUT IN TOCDWP1C1

JiNo PWR MCDWP1A JiNo

PWR MCXP

JiNo PWR MCVP1B

OPN POS

EOUT EIN

CLS TRP RST BIAC3

EIN ZL_IAC3

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 1ES

OPN POS

EOUT EIN

CLS TRP RST BIOP1A OPN POS EOUT

EIN CLS TRP RST BWUOP OPN POS

EOUT EIN

CLS TRP RST BFDF1ALOPA OPN POS EOUT

EIN CLS TRP RST BFDF1ALOPB OPN POS EOUT

EIN CLS TRP RST BFDF1BLOPA OPN POS EOUT

EIN CLS TRP RST BFDF1BLOPB

EIN ZL_IOP1A EIN ZL_FDF1ALOPA EIN ZL_FDF1ALOPB EIN ZL_FDF1BLOPA EIN ZL_FDF1BLOPB EIN ZL_WUOP

OPN POS

EOUT EIN

CLS TRP RST BIAC2

EIN ZL_IAC2

OPN POS

EOUT EIN

CLS TRP RST BWPP1

EIN ZL_WPP1

OPN POS

EOUT EIN

CLS TRP RST BWPP2

EIN ZL_WPP2

IN O1 O2 O3 O4 O5 O7 O8 O6 O9 O10 1TAB

OPN POS

EOUT EIN

CLS TRP RST BGSCP1B OPN POS EOUT

EIN CLS TRP RST BGLCF1B OPN POS

EOUT EIN

CLS TRP RST BHPHDP1B OPN POS

EOUT EIN

CLS TRP RST BBFP1BTTGM

EIN ZL_GSCP1B EIN ZL_GLCF1B EIN ZL_HPHDP1B EIN ZL_BFP1BTTGM

OPN POS

EOUT EIN

CLS TRP RST BBFP1BTMOPB

EIN ZL_BFP1BTMOPB

OPN POS

EOUT EIN

CLS TRP RST BCVPP1B

EIN ZL_CVPP1B

OPN POS

EOUT EIN

CLS TRP RST BBFP1ATMOPB

EIN ZL_BFP1ATMOPB

OPN POS

EOUT EIN

CLS TRP RST BSWP2

EIN ZL_SWP2


OUT3 OUT2 OUT1 480L

Lin Rin Lm1 Rm1 Lm2 Rm2 SUS

Lin Rin Lm1 Rm1 Lm2 Rm2 WT

PRI SEC1 SEC2 AUX

OPN POS

EOUT EIN

CLS TRP RST BDP1A OPN POS EOUT

EIN CLS TRP RST BBCP1C

JiNo PWR MAOP1B

JiNo PWR MFDF1A

JiNo PWR MFDF1B

Lin Rin Lm1 Rm1 Lm2 Rm2 480_PS1 Lin Rin

Lm1 Rm1 Lm2 Rm2 480_PS2

Lin Rin Lm1 Rm1 Lm2 Rm2 480_1A Lin Rin

Lm1 Rm1 Lm2 Rm2 480_1B OPN


OPN POS



OPN POS


OPN POS

EOUT EIN

CLS TRP RST BAPH1B

EIN ZL_APH1B

OPN POS

EOUT EIN CLS TRP RST FIELD

OUT IN TOBCP1A

OPN POS

EOUT EIN

CLS TRP RST BSAC2

JiNo PWR MSAC2

NE SAC1 NE SAC2

NE SAC3 NE FP

NE CVP1A NE CVP1B

NE AOP1A NE AOP1B

Figure 3. MMS model schematic

Figure 4. Plant’s one-line HMI screen

Figure 5. Emulation of generator synchronization hard panel

Figure 6. Emulation of startup load, start/stop hard panel Example Dynamic Load Flow Simulation Before the generator is synchronized, the power for the startup and station service loads is obtained from the startup power supply by closing the appropriate breakers and starting the motors. Startup loads include auxiliary oil pump, cooling water pump, service air compressor, instrument air compressor, etc. Station service loads include condensate pump, forced draft fan, fuel oil burner pump, etc. Then the generator is brought up to synchronous speed by operating the turbine steam valves, the excitation current is adjusted to obtain matching terminal voltage, and the generator is synchronized from the synchroscope. The generator power output is then increased by opening the turbine throttle valves, and adjusting the excitation current from the automatic voltage regulator. The power for the station service loads is then changed from startup supply to the generator by closing and opening appropriate breakers. Trends in Figures 7 and 8 show typical motor starting current and important parameters of the generator, respectively.

Figure 7. Motor starting current

Figure 8. Generator parameters Biography Sadashiva Godbole performs power plant simulation development at nHance Technologies, Lynchburg, Virginia, USA. Earlier he was an Advisory Engineer and Framatome Expert at Areva NP Inc. He holds a Ph.D. in Electrical Engineering from Virginia Polytechnic Institute and State University. He has numerous publications.

improve reliability and training of power plant electrical ...cnd v p 1b cooling water to rst lphdp...

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