Desk console power systems simulator with hands-on control

Claim 2

A DC loadflow calculator for simulation of an AC power network with transient stability analysis capability, said calculator including a plurality of DC circuits arranged to simulate network elements and interconnected to correspond to the AC network, an operator console including means for generating signals representative of predetermined network variAbles for application to said DC circuits, said DC circuits including means for responding to the network variable signals and to DC circuit interconnection signals to generate output signals applicable to said console, means for generating signals representative of transient fault conditions, said operator console including means for imposing said transient fault signals on one or more of said DC circuits after a loadflow solution has been reached, said DC circuits including means for responding to transient fault signals to institute the imposed fault or faults in the DC simulator circuits, said operator console further including means for responding to the output signals from said DC circuits to display loadflow solutions and transient network responses.

Claim 3

A DC loadflow calculator having transient stability analysis capability as set forth in claim 1 wherein said plurality of DC circuits includes a plurality of bus, generator, load, tie line and line DC circuits interconnected to correspond to the AC network.

Claim 4

A DC loadflow calculator with transient stability analysis capability as set forth in claim 2 wherein said signals representative of predetermined network variables include generator mechanical power and generator voltage magnitude signals applicable to said generator DC circuits, and first and second load admittance signals applicable to said load DC circuits.

Claim 5

A DC calculator as set forth in claim 3 wherein each of said generator DC circuits includes means for receiving said generator mechanical power signals and said voltage magnitude signals from said console, each of said bus DC circuits includes means for responding to generator, load, tie line and line phasor current input signals from other interconnected DC circuits, and for generating an output bus voltage phasor signal, each of said generator DC circuits includes means for responding to the difference between the voltage magnitude signal from said console and the applicable bus voltage phasor signal from an interconnected bus DC circuit to generate an output generator phasor current signal and a generator real electrical power signal, each of said generator DC circuits including means for responding to the difference between the generator mechanical power signal from said console and the generator real electrical power signal so as to generate a generator swing angle signal for application to said console, each of said load DC circuits includes means for receiving said first and second load admittance signals from said console so as to become structured with a corresponding admittance, each of said load DC circuits further includes means for generating an output bus to load current phasor signal as a function of the applicable bus voltage phasor signal, each of said tie line and line DC circuits includes means for responding to the difference between applied bus voltage phasor signals to generate an output line phasor current signal in accordance with at least a representation of the equivalent series branch impedance, at least one of said applied bus voltage phasor signals to each of said tie line DC circuits being an infinite bus voltage phasor signal.

Claim 6

A DC calculator as set forth in claim 2 wherein said means for generating transient fault signals is connected to at least some of said bus, generator, load, tie line and line DC circuits for imposing three phase fault signals to said bus, tie line and line DC circuits, transient drop signals to said generator, load, tie line and line DC circuits, and swing angle restoration and damping signals to said generator DC circuits.

Claim 7

A DC calculator as set forth in claim 5 wherein said means for generating transient fault signals includes a clock for providing real time and faster than real time clock output signals, a means for receiving said clock output signals and for generating a bus three phase fault output signal to said bus DC circuits, a line three phase fault output signal to said line and tie line DC circuits, a transient drop output signal to said generator, load, tie line and line DC cicuits, and a generator damp output signal to said generator DC circuits.

Claim 8

A DC calculator as set forth in claim 6 wherein each of said generator DC circuits includes means for receiving said clock output signals for operation at real time and faster than real time.

Claim 9

A DC calculator as set forth in claim 7 wherein said bus three phase fault signal, said line three phase fault signal, said transient drop signal and said generator damp signal each comprise a single pulse.

Claim 10

A DC calculator as set forth in claim 8 wherein said generator swing angle restore signal is produced by the trailing edge of said transient drop pulse signal.

Claim 11

A DC calculator as set forth in claim 8 wherein means is provided for adjustment of the pulse duration of said bus three phase pulse.

Claim 12

A DC calculator as set forth in claim 10 wherein said operator console includes means for adjusting each of said generator mechanical power and generator voltage magnitude input signals, means for adjusting said first and second load admittance signals, means for allowing removal of each of said DC circuits from service, means for adjusting the duration of said bus three phase fault signal, means connected to said clock to provide for selection of operation at real time and faster than real time, and means connected to said DC circuit output signals for displaying generator electrical power, bus voltage, tie line and line real and reactive powers, load real and reactive powers, and generator swing angles.

Claim 13

A DC calculator as set forth in claim 7 wherein said line three phase fault signal is initiated at the end of a bus three phase fault signal.

Claim 14

A DC calculator as set forth in claim 7 wherein said bus three phase fault signal, said line three phase fault signal, said transient drop three phase fault signal and said generator damp signal each comprise a plurality of pulses for repeated operation of associated transient faults.

Claim 15

A DC calculator as set forth in claim 2 wherein means is provided for removal of each of said generator, load, tie line and line DC circuits from service.

Claim 16

A DC loadflow calculator having transient stability analysis capability as set forth in claim 1 wherein said DC circuits simulate at least tie lines, generators, lines and loads and wherein the output signals generated by said DC circuit responding means for application to said console include line and tie line power signals and generator internal angle signals and voltage magnitude signals for uncontrolled voltage busses.

Claim 17

A DC loadflow calculator as set forth in claim 15 wherein said transient fault signal generating means includes means for generating three phase fault signals and transient drop signals.

Claim 18

A DC loadflow calculator as set forth in claim 16 wherein said transient fault signal generating means further includes means for generating swing angle restoration and damping signals.

Claim 19

A DC loadflow calculator having transient stability analysis capability as set forth in claim 1 wherein said network variable signal generating means includes means for generating variable voltage magnitude signals and variable megawatt signals for controlled voltage busses.

Claim 20

A DC loadflow calculator as set forth in claim 18 wherein said network variable signal generating means includes means for generating variable megawatt and megavar signals for loads.

Claim 21

A DC loadflow calculator as set forth in claim 19 wherein said network variable signal generating means includes means for generating outage signals for lines and tie lines.

Claim 22

A DC loadflow calculator having transient stability analysis capability as set forth in claim 1 wherein said network variable signal generating means includes means for generating variable megawatt and megavar signals for loads.

Claim 23

A DC loadflow calculator having transient stability analysis capability as set forth in claim 1 wherein said network variable signal generating means includes means for generating outage signals for lines and tie lines.

Claim 24

A DC loadflow calculator having transient stability analysis capability as set forth in claim 1 wherein said transient fault signal generating means includes means for generating three phase fault signals and transient drop signals.

Claim 25

A DC loadflow calculator as set forth in claim 23 wherein said transient fault signal generating means further includes means for generating swing angle restoration and damping signals.

Claim 26

A DC loadflow calculator as set forth in claim 1 wherein said transient fault signal generating means includes a clock which provides output signals from which the fault signals are desired.

Claim 27

A DC loadflow calculator as set forth in claim 25 wherein said clock generates real time and faster than real time output signals for the generation of transient fault responses in said DC circuits in real time or faster than real time.

Claim 28

A DC loadflow calculator as set forth in claim 1 wherein said network variable signal generating means includes means for generating variable voltage magnitude signals and variable megawatt signals for controlled voltage busses.

Claim 29

A DC loadflow calculator as set forth in claim 27 wherein said network variable signal generating means includes means for generating variable megawatt and megavar signals for loads.

Claim 30

A DC loadflow calculator as set forth in claim 28 wherein said transient fault signal generating means includes means for generating three phase fault signals and transient drop signals.

Claim 31

A DC loadflow calculator as set forth in claim 5 wherein the output signals generated by said DC circuit responding means for application to said console include line and tie line power signals and generator internal angle signals and voltage magnitude signals for uncontrolled voltage busses.

Claim 32

A DC loadflow calculator as set forth in claim 30 wherein said network variable signal generating means includes means for generating variable voltage magnitude signals and variable megawatt signals for controlled voltage busses.

Claim 33

A DC loadflow calculator as set forth in claim 30 wherein said network variable signal generating means includes means for generating variable megawatt and megavar signals for loads.