CN114172420A

CN114172420A - Rotor coupling double-machine parallel motor generator set complete set and protection control system

Info

Publication number: CN114172420A
Application number: CN202111424805.5A
Authority: CN
Inventors: 康杰; 冯伟岗; 陈伟龙; 黄超; 万田; 朱太波; 张晋强
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Suzhou Nuclear Power Research Institute Co Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-03-11
Anticipated expiration: 2041-11-26
Also published as: CN114172420B

Abstract

The invention relates to a rotor coupling double-machine parallel motor generator set complete set and protection control system, which comprises: a comprehensive protection system device; it includes: the single machine starting logic control module, the single machine shutdown logic control module and the single machine excitation/de-excitation logic control module; the single-machine starting logic control module controls the rotor to couple the double-machine parallel motor generator set to execute single-machine starting; the single machine shutdown logic control module controls the rotor to couple the double-machine parallel motor generator set to execute single machine shutdown; and the single machine excitation/de-excitation logic control module controls the rotor to be coupled with the double machine parallel motor generator set to execute excitation or de-excitation. The invention realizes the system control function by utilizing the logic control of the integrated system device, improves the reliability of the system operation, saves the equipment investment, can effectively identify the fault and improves the troubleshooting efficiency.

Description

Rotor coupling double-machine parallel motor generator set complete set and protection control system

Technical Field

The invention relates to the technical field of power systems, in particular to a complete set and protection control system of a rotor-coupled double-machine parallel motor generator set.

Background

The rotor coupling double-machine parallel motor generator set is widely applied to occasions with high requirements on power supply reliability, such as nuclear power plants, ship power systems and the like. Because the double-machine parallel system not only has parallel stators, but also has coupling of the rotor excitation winding, the protection and control system is very complicated in the existing design, the protection and control system has more equipment, high cost and low reliability. Meanwhile, the past system design has incompleteness and imperfection, dead zones exist for partial faults, and rapid protection is not provided for some near zone faults.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a complete set of rotor-coupled dual-motor parallel motor generator set and a protection control system, aiming at the above-mentioned defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a rotor coupling double-machine parallel motor generator set complete set and protection control system is constructed, and the system comprises: a comprehensive protection system device; the comprehensive protection system device comprises: the single machine starting logic control module, the single machine shutdown logic control module and the single machine excitation/de-excitation logic control module;

the single-machine starting logic control module is used for controlling the rotor to be coupled with the double-machine parallel electric generator set to execute single-machine starting;

the single machine shutdown logic control module is used for controlling the rotor coupled double-machine parallel electric generating set to execute single machine shutdown;

and the single machine excitation/de-excitation logic control module is used for controlling the rotor coupled double machine parallel electric generating set to execute excitation or de-excitation.

In the rotor-coupled double-machine parallel motor generator set complete set and protection control system of the invention, the system further comprises: a rotor coupling control module;

and the synchronous control and rotor coupling control module is used for controlling the rotor coupling double-machine parallel motor generator set to execute synchronous operation or rotor coupling.

In the rotor-coupled double-machine parallel motor generator set complete set and protection control system of the invention, the system further comprises: an excitation protection logic control module;

and the excitation protection logic control module is used for controlling the rotor coupled double-motor parallel motor generator set to execute excitation protection.

In the rotor-coupled double-machine parallel motor generator set complete set and protection control system of the invention, the system further comprises: a protection output and alarm output logic module;

and the protection output and alarm output logic module is used for controlling the rotor coupled double-motor parallel motor generator set to execute protection output logic and alarm output logic.

In the rotor-coupled double-machine parallel motor generator set complete set and protection control system of the invention, the system further comprises: an alarm indication logic module;

and the alarm indication logic module is used for controlling the rotor coupled double-motor parallel motor generator set to execute alarm indication.

In the rotor-coupled double-machine parallel motor generator set complete set and protection control system of the invention, the system further comprises: a system working power supply indication logic module;

and the system working power supply indication logic module is used for controlling the rotor coupled double-motor parallel motor generator set to execute power supply indication.

In the rotor-coupled dual-motor parallel motor generator set and protection control system of the present invention, the rotor-coupled dual-motor parallel motor generator set includes: a first unit and a second unit;

the single-machine starting logic control module comprises: the first sub single machine starting logic control module and the second sub single machine starting logic control module;

the first sub single machine starting logic control module is used for controlling the first unit to execute single machine starting;

and the second sub single machine starting logic control module is used for controlling the second unit to execute single machine starting.

the single machine excitation/de-excitation logic control module comprises: the excitation/de-excitation logic control module of the first single-machine sub and the excitation/de-excitation logic control module of the second single-machine sub;

the first sub-single machine excitation/de-excitation logic control module is used for controlling the first unit to execute single machine excitation or de-excitation;

and the second sub-single machine excitation/de-excitation logic control module is used for controlling the second unit to execute single machine excitation or de-excitation.

the excitation protection logic control module comprises: the first sub-excitation protection logic control module and the second sub-excitation protection logic control module;

the first sub-excitation protection logic control module is used for controlling the first unit to execute excitation protection;

and the second sub-excitation protection logic control module is used for controlling the second unit to execute excitation protection.

The complete set of the rotor coupling double-machine parallel motor generator set and the protection control system have the following beneficial effects: the method comprises the following steps: a comprehensive protection system device; it includes: the single machine starting logic control module, the single machine shutdown logic control module and the single machine excitation/de-excitation logic control module; the single-machine starting logic control module controls the rotor to couple the double-machine parallel motor generator set to execute single-machine starting; the single machine shutdown logic control module controls the rotor to couple the double-machine parallel motor generator set to execute single machine shutdown; and the single machine excitation/de-excitation logic control module controls the rotor to be coupled with the double machine parallel motor generator set to execute excitation or de-excitation. The invention realizes the system control function by utilizing the logic control of the integrated system device, improves the reliability of the system operation, saves the equipment investment, can effectively identify the fault and improves the troubleshooting efficiency.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a rotor-coupled dual-machine parallel motor-generator component system according to an embodiment of the present invention;

FIG. 2 is a logic diagram of a contemporaneous control and rotor coupling control module provided in accordance with an embodiment of the present invention;

FIG. 3 is a logic diagram of a first sub-stand-alone start-up logic control module according to an embodiment of the present invention;

FIG. 4 is a logic diagram of a second sub-stand-alone start-up logic control module according to an embodiment of the present invention;

fig. 5 is a logic diagram of a first sub-excitation protection logic control module provided by an embodiment of the present invention;

fig. 6 is a logic diagram of a second sub-excitation protection logic control module provided in an embodiment of the present invention;

fig. 7 is a logic diagram of a first sub-single machine excitation/de-excitation logic control module according to an embodiment of the present invention;

fig. 8 is a logic diagram of a second sub-single machine excitation/de-excitation logic control module according to an embodiment of the present invention;

FIG. 9 is a logic diagram of a first sub-protection output and alarm output logic block provided by an embodiment of the present invention;

FIG. 10 is a logic diagram of a second sub-protection output and alarm output logic block provided by an embodiment of the present invention;

FIG. 11 is a logic diagram of an alarm indication logic provided by an embodiment of the present invention;

FIG. 12 is a logic diagram of system operating power indication logic provided by an embodiment of the present invention;

fig. 13 is a schematic block diagram of a rotor-coupled double-machine parallel motor generator set and protection control system according to an embodiment of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

In order to overcome the defects in the design of the conventional rotor-coupled double-motor parallel motor generator set protection and control system, the invention provides a rotor-coupled double-motor parallel motor generator set complete set and protection control system which has the characteristics of high reliability, high sensitivity and high integration degree.

Specifically, referring to fig. 13, a schematic block diagram of an alternative embodiment of a rotor-coupled dual-machine parallel motor generator set and protection control system provided by the present invention is shown.

In this embodiment, the rotor-coupled double-motor parallel motor generator set complete and protection control system includes: the integrated protection system device 10. Wherein, this integrated protection system device 10 includes: a single machine starting logic control module 11, a single machine shutdown logic control module 12 and a single machine excitation/de-excitation logic control module 13, and further, a dual machine synchronous parallel logic control module 14 may be further included.

The single-machine starting logic control module 11 is used for controlling the rotor coupled double-machine parallel motor generator set to execute single-machine starting.

The single machine shutdown logic control module 12 is used for controlling the rotor coupled double machine parallel motor generator set to execute single machine shutdown.

The single machine excitation/de-excitation logic control module 13 is used for controlling the rotor to be coupled with the double machine parallel motor generator set to execute excitation or de-excitation.

Further, as shown in fig. 13, the integrated protection system device 10 further includes: the rotor is coupled to the control module 15. The rotor coupling control module 15 is used for controlling the rotor coupling double-machine parallel motor generator set to execute synchronous operation or rotor coupling.

Further, as shown in fig. 13, the integrated protection system device 10 further includes: an excitation protection logic control module 16. The excitation protection logic control module 16 is used for controlling the rotor coupled double parallel motor generator set to execute excitation protection.

Further, as shown in fig. 13, the integrated protection system device 10 further includes: protection output and alarm output logic module 19. The protection output and alarm output logic module 19 is used for controlling the rotor coupled double-machine parallel motor generator set to execute protection output logic and alarm output logic.

Further, as shown in fig. 13, the integrated protection system device 10 further includes: alarm indication logic 17. The alarm indication logic module 17 is used for controlling the rotor coupled double-machine parallel motor generator set to execute alarm indication.

Further, as shown in fig. 13, the integrated protection system device 10 further includes: system operating power indicates logic 18. The system working power supply indication logic module 18 is used for controlling the rotor coupled double-machine parallel motor generator set to execute power supply indication.

In the embodiment of the invention, the rotor coupling double-machine parallel motor generator set comprises: a first unit and a second unit. Specifically, as shown in fig. 1, a schematic diagram of a rotor-coupled dual-machine parallel motor generator set system according to an embodiment of the present invention is provided.

As shown in fig. 1, SET G1 is a first unit, SET G2 is a second unit, where fig. 1 is a symbol with reference numerals JA, JS, etc. as switches, for example, 404JA is a motor start or stop switch of the first unit, 401JA is a generator start or stop switch of the first unit, and 402JA is connected to a coil as an excitation winding of the first unit. 604JA is a motor starting or stopping switch of the second unit, 601JA is a generator starting or stopping switch of the second unit, a coil connected with 602JA is an excitation winding of the second unit, RGL is a load, and when the first unit and the second unit run in parallel, the first unit and the second unit provide energy for the RGL at the same time. When 401JA, 404JA, 601JA and 604JA are closed, the first unit and the second unit run in parallel, wherein 501CP and 502CP are used for collecting phase voltages so as to monitor the phase voltages of the first unit and the second unit, and further the first unit and the second unit are ensured to run synchronously according to the collected phase voltages, so that overcurrent or overshoot is prevented, and unit damage is avoided.

Further, as shown in fig. 1, MO in SET G1 denotes a motor of the first unit, and AP denotes a generator of the second unit. In the subsequent logic control, MO1 denotes the motor of the first power train, 001AP denotes the generator of the first power train, MO2 denotes the motor of the second power train, and 002AP denotes the generator of the second power train.

In the embodiment of the present invention, the integrated protection system device 10 of the embodiment of the present invention collects and controls the switches, and the related signals, information, states, and the like of the rotor-coupled dual parallel motor generator system, thereby implementing protection and control.

Fig. 2 is a logic diagram of the rotor coupling control module 15 according to an embodiment of the present invention.

As shown in fig. 2, the rotor coupling control module 15 includes: when the fact that the synchronous relay of the first unit or the synchronous relay of the second unit needs to be put into operation is detected (namely when BO.12 outputs a command of putting the synchronous relay of the first unit or the synchronous relay of the second unit, an OR gate outputs a command of putting the synchronous relay of the first unit or the synchronous relay of the second unit, and at the moment, the synchronous relay is triggered to be started through 501XR (signal of putting the synchronous relay).

Further, as shown in fig. 2, when it is detected that the magnetizing circulation (From Sh8) of the first unit is greater than 20A and the magnetizing circulation (From Sh8) of the second unit is greater than 20A, at the same time, 401JA is in an on position and 601JA is in an on position, a command for controlling 502JA to be closed is output, 502JA is closed after the 502JA receives the closing command, a closing command is output to 505JA at the same time, 505JA is closed, at the same time, rotor coupling can be performed, and at the same time, a 502LA indicator lamp performs a rotor coupling indication (i.e., 502LA light). It should be noted that 510JS in fig. 1 is always in the closed state after the use.

In the embodiment of the present invention, the single-machine startup logic control module 11 includes: a first sub-stand-alone start logic control module 11 and a second sub-stand-alone start logic control module 11.

In the embodiment of the present invention, the first sub-single machine start logic control module 11 is configured to control the first machine set to execute single machine start.

Specifically, as shown in fig. 3, it is a logic diagram of the first sub-stand-alone start logic control module 11 according to the embodiment of the present invention.

As shown in fig. 3, the first sub-stand-alone start-up logic control module 11 is composed of a plurality of or gates, a plurality of not gates, RS flip-flops, time delays, and a plurality of and gates.

As shown in fig. 3, 401TL is an opening/closing control knob of the motor power switch of the first unit. The 401TL is manually opened and closed (close), the closing command enters the first sub-single machine starting logic control module 11, the S end of the RS trigger is triggered, when the condition of the R end of the RS trigger is not met, the RS trigger is triggered, if the 401JA is in the open position at the moment and the 401JA is still detected to be in the open position during detection at the same time, 404JA meets the closing condition, a 0.5S closing command is sent, after the 0.5S closing command is sent, the protection outlet continuation device does not act, and the 404JA closing command is output to enable 404JA to be closed. After 404JA is switched on, the switching-on state of 404JA is fed back to 3 positions, which are respectively: the LA indicator (red light) is lit 402, 104EC is triggered in the KIT system, and the closing time is recorded.

In the embodiment of the present invention, the second sub-single-computer startup logic control module 11 is configured to control the second unit to execute single-computer startup.

Specifically, as shown in fig. 6, it is a logic diagram of the second sub-single start-up logic control module 11 according to the embodiment of the present invention.

As shown in fig. 4, the second sub-single-machine start-up logic control module 11 is composed of a plurality of or gates, a plurality of not gates, RS flip-flops, time delays, and a plurality of and gates.

As shown in fig. 4, 601TL is an opening/closing control knob of the motor power switch of the first unit. The 601TL is manually opened and closed (close), the closing command enters the first sub-single machine starting logic control module 11, the S end of the RS trigger is triggered, when the condition of the R end of the RS trigger is not met, the RS trigger is triggered, if the 601JA is in the open position at the moment and the 601JA is still detected to be in the open position during detection at the same time, 604JA meets the closing condition, a 0.5S closing command is sent, after the 0.5S closing command is sent, the protection outlet continuation device does not act, and the 604JA closing command is output to enable the 604JA to be closed. After 604JA is switched on, the switching-on state of 604JA is fed back to 3 positions, which are respectively: the LA indicator light (red light) is lit 602, 204EC is triggered in the KIT system, and the closing time is recorded.

In the embodiment of the present invention, the single shutdown logic control module 12 includes: a first sub-stand-alone shutdown logic control module 12 and a second sub-stand-alone shutdown logic control module 12. The logic diagram of the first stand-alone shutdown logic control module 12 and the logic diagram of the first stand-alone startup logic control module 11 share a logic diagram, and the logic control of the logic diagram is opposite to the control logic of the first stand-alone startup logic control module 11. Similarly, the logic diagram of the second stand-alone shutdown logic control module 12 and the logic diagram of the second stand-alone startup logic control module 11 share the same logic diagram, and the logic control is opposite to the control logic of the second stand-alone startup logic control module 11.

In the embodiment of the present invention, the excitation protection logic control module 16 includes: a first sub-excitation protection logic control module 16 and a second sub-excitation protection logic control module 16. The first sub-excitation protection logic control module 16 is used for controlling the first unit to execute excitation protection; the second sub-excitation protection logic control module 16 is configured to control the second unit to perform excitation protection.

Specifically, as shown in fig. 5, a logic diagram of the first sub-excitation protection logic control module 16 is shown.

As shown in fig. 5, the first sub-excitation protection logic control module 16 includes: a plurality of AND gates, a delayer, an indicator light and an OR gate.

As shown in fig. 5, when the excitation current of the first unit is less than 30A and 401JA is in the closed position, if the state is maintained after 2s of delay, the LED8 indicator lamp is on, and the excitation protection of the first unit is triggered. Or when 401JA is in a closed position, 411JS excitation regulator has a fault, 601JA is in a closed position and the exciting circulation current of the first unit is greater than 20A, if the state is maintained after 2s delay, the LED9 indicator lamp is on and the excitation protection of the first unit is triggered. Or when 401JA is in the closed position, 601JA is in the closed position and the exciting circulation current of the first unit is greater than 20A, if the state is maintained after the delay of 5s, the LED7 indicator lamp is turned on and the excitation protection of the first unit is triggered. Or when 401JA is in the on position, 601JA is in the on position and the loss of excitation protection is larger than 1 segment, if the state is still maintained after the delay of 5s, the LED712 indicator lamp is turned on, and the excitation protection of the first unit is triggered.

Specifically, as shown in fig. 6, it is a logic diagram of the second sub-excitation protection logic control module 16.

As shown in fig. 6, the second sub-excitation protection logic control module 16 includes: a plurality of AND gates, a delayer, an indicator light and an OR gate.

As shown in fig. 6, when the excitation current of the second unit is less than 30A and 601JA is in the on position, if the state is maintained after 2s of delay, the LED8 indicator lamp is on, and the excitation protection of the second unit is triggered. Or when 601JA is in the closed position, 611JS excitation regulator fails, 401JA is in the closed position and the excitation circulating current of the second unit is greater than 20A, if the state is maintained after 2s delay, the LED9 indicator lamp is on, and excitation protection of the second unit is triggered. Or when 601JA is in the closed position, 401JA is in the closed position and the exciting circulation current of the second unit is larger than 20A, if the state is maintained after the delay of 5s, the LED7 indicator lamp is turned on and the excitation protection of the second unit is triggered. Or when 601JA is in the closed position, 401JA is in the closed position and the loss-of-field protection is larger than 1 segment, if the state is still maintained after the delay of 5s, the LED712 indicator lamp is turned on, and the excitation protection of the second unit is triggered.

In the embodiment of the present invention, the single machine excitation/demagnetization logic control module 13 includes: a first sub-single machine excitation/de-excitation logic control module 13 and a second sub-single machine excitation/de-excitation logic control module 13.

In the embodiment of the present invention, the first single excitation/de-excitation logic control module 13 is configured to control the first unit to perform single excitation or de-excitation.

As shown in fig. 7, it is a logic diagram of the first single-machine excitation/de-excitation logic control module 13.

As shown in fig. 7, the first single-machine excitation/de-excitation logic control module 13 includes: a plurality of AND gates, NOT gates and delayers.

Specifically, as shown in fig. 7, 402TO is a first set of demagnetization buttons. When 402TO is triggered, a demagnetization command is generated, the first standalone excitation/demagnetization logic control module 13 is accessed through a BI.7 interface, at this time, if 401JA is detected TO be in a separating position, a triggering demagnetization signal is output through BO.10, if 401JA is detected TO be still in the separating position at this time, a command for controlling 402JA TO close is output, and after 402JA is closed, a 405LA indicator lamp (yellow lamp) is turned on.

As shown in fig. 7, 401TO is the first unit energizing button. When 401TO is triggered, an excitation command is generated, the first single-machine excitation/demagnetization logic control module 13 is accessed through a BI.6 interface, at this time, if the current of the 001AP overvoltage 1 section is detected TO be less than 0.95Un, no total trip command exists, 404JA is in the on position, and after the time delay of 30s, 404JA is still in the on position, a 5s closing pulse command is output, after the 5s closing pulse command is output, 402JA is in the off position, a trigger excitation signal is output through BO.8, if 402JA is detected TO be in the off position, a control 403JA closing command is output, and after 403JA is closed, a white light is on.

In the embodiment of the present invention, the second single machine excitation/demagnetization logic control module 13 is configured to control the second unit to perform single machine excitation or demagnetization.

As shown in fig. 8, it is a logic diagram of the first single-machine excitation/de-excitation logic control module 13.

As shown in fig. 8, the first single-machine excitation/demagnetization logic control module 13 includes: a plurality of AND gates, NOT gates and delayers.

Specifically, as shown in fig. 8, 602TO is a first set of demagnetization buttons. When 602TO is triggered, a demagnetization command is generated, the first sub-single machine excitation/demagnetization logic control module 13 is accessed through a BI.7 interface, at this time, if 601JA is detected TO be in a separating position, a triggering demagnetization signal is output through BO.10, if 601JA is detected TO be still in the separating position at this time, a 602JA closing command is output and controlled, and after 602JA is closed, a 605LA indicator lamp (yellow lamp) is turned on.

As shown in fig. 8, 601TO is a first unit energizing button. When 601TO is triggered, an excitation command is generated and is accessed into a first sub-single machine excitation/demagnetization logic control module 13 through a BI.6 interface, at this time, if the current of a002 AP overvoltage 1 section is detected TO be less than 0.95Un, no total trip command exists, 604JA is in an on position, and after delaying for 30s, 604JA is still in the on position, a 5s closing pulse command is output, after the 5s closing pulse command is output, 602JA is in an off position, a trigger excitation signal is output through BO.8, if 602JA is detected TO be in the off position, a control 603JA closing command is output, and after 603JA is closed, a white light is on.

In the embodiment of the present invention, the protection output and alarm output logic module 19 includes: a first sub-protection output and alarm output logic module 19 and a second sub-protection output and alarm output logic module 19. The first sub-protection output and alarm output logic module 19 is configured to perform protection output logic control and alarm output logic control on the first unit. The second sub-protection output and alarm output logic module 19 is configured to perform protection output logic control and alarm output logic control on the second unit.

Fig. 9 shows a logic diagram of the first sub-protection output and alarm output logic module 19.

Specifically, as shown in fig. 9, the first sub-protection output and alarm output logic module 19 includes a plurality of or gates and indicator lights.

As shown in fig. 9, when the first team is fully protected from overcurrent protection triggering, the LED4 indicator lights up; when the first unit excitation protection is triggered, an excitation protection trigger signal is output through BO.2, and a 412LA excitation protection indicator lamp is turned on; when the first unit differential protection is triggered, a differential protection instruction is output through BO.5, a 411LA indicator lamp is turned on, and an LED8 indicator lamp is turned on at the same time; when the first unit is triggered by sudden voltage application, an LED6 indicator lamp is on, and simultaneously, the BO.13 output sudden voltage application protection is carried out, and an 417LA indicator lamp is on; when the reverse power protection of the first unit is triggered, an LED5 indicator lamp is turned on, meanwhile, a reverse power protection indication is output through BO.3, and a 413LA indicator lamp is turned on; when the motor of the first unit jumps, the LED10 indicator lamp is on, and meanwhile, the BO.18 output motor jump instruction, and the 416LA indicator lamp is on; when the first unit low frequency protection is triggered, the LED11 indicator lamp is on, and simultaneously a low frequency alarm indication is output through BO.19, and the 418LA indicator lamp is on.

Further, as shown in fig. 9, when any one of the above-described protection is triggered, a protection trigger instruction is output, and the 401XD receives a command to trigger the protection outlet relay.

As shown in fig. 10, when the second unit comprehensive protection overcurrent protection is triggered, the LED4 indicator lamp is on; when the first unit excitation protection is triggered, an excitation protection trigger signal is output through BO.2, and a 612LA excitation protection indicator lamp is on; when the differential protection of the second unit is triggered, a differential protection instruction is output through BO.5, a 611LA indicator lamp is turned on, and an LED8 indicator lamp is turned on at the same time; when the second unit is triggered by sudden voltage application, the LED6 indicator lamp is on, and simultaneously, the sudden voltage application protection is output through BO.13, and the 617LA indicator lamp is on; when the reverse power protection of the second unit is triggered, an LED5 indicator lamp is turned on, meanwhile, a reverse power protection indication is output through BO.3, and an 613LA indicator lamp is turned on; when the motor of the second unit jumps, the LED10 indicator light is on, and meanwhile, the motor jump indicator is output through BO.18, and the 616LA indicator light is on; when the first group low frequency protection is triggered, the LED11 indicator lamp is on, and simultaneously a low frequency alarm indication is output through BO.19, and the 618LA indicator lamp is on.

Further, as shown in fig. 10, when any one of the above-mentioned protections is triggered, a protection trigger instruction is output, 601XD receives a command to trigger the protection outlet relay.

Referring to fig. 11, a logic diagram of alarm indication logic module 17 is provided in accordance with an embodiment of the present invention.

As shown in fig. 11, when the low voltage 1 section of the first unit is low voltage and 401JA is in the closed position, a voltage abnormality alarm indication signal is output, and at this time, an LED13 indicator lamp is turned on; or when the overvoltage 2 section of the first unit is overvoltage and 401JA is in a closed position, outputting a voltage abnormity alarm indicating signal, and at the moment, lighting an LED13 indicating lamp; when the exciting circulation of the first unit is more than 20A, outputting a circulation overcurrent alarm indication signal, and lighting a 513LA (local area network) indicator lamp; when the first unit low-frequency protection is triggered, a low-frequency alarm indicating signal is output, and a 514LA indicating lamp is turned on.

As shown in fig. 11, when the low voltage 1 section of the second unit is low voltage and 601JA is in the closed position, a voltage abnormality alarm indication signal is output, and at this time, an LED13 indicator lamp is turned on; or when the overvoltage 2 section of the second unit is overvoltage and 601JA is in the closed position, outputting a voltage abnormity alarm indication signal, and at the moment, lighting an LED13 indicator lamp; when the excitation circulating current of the second unit is more than 20A, a circulating current overcurrent alarm indication signal is output, and a 513LA indicator lamp is turned on; when the two-unit low-frequency protection is triggered, a low-frequency alarm indicating signal is output, and a 514LA indicating lamp is turned on.

Referring to fig. 12, a logic diagram of the system operating power indication logic module 18 according to an embodiment of the present invention is provided.

As shown in fig. 12, LBA002.07 and LCA003.02 are power supplies of the first unit, and LBA002.08 and LCA003.03 are power supplies of the second unit. Here, 404LA is an indicator light (white light) of LBA002.07, and 606LA is an indicator light (white light) of LBA 002.8. 401LA is an LCA003.02 indicator light (white light), 601LA is an LCA003.03 indicator light (white light). 501LA is the switch indicator (white light) of LCA003.02 and LCA 003.03. Wherein, the CHANGOVER ONE CONTROL SOURCE TO OTHER in FIG. 12 indicates that LCA003.02 and LCA003.03 can be used as backup and switched.

Further, the rotor-coupled double-motor parallel motor generator set and protection control system of the embodiment of the invention can realize protection control of the motor generator set by carrying out logic control based on the logic module, wherein the protection control comprises but is not limited to reverse power protection, frequency protection, single-phase grounding protection, sudden voltage protection and the like.

For example, phi reverse power protection. Reverse power protection has only existed in the past as protection of the generator itself. For motor driven generator sets, the generator may continue to operate under reverse power conditions without consideration of the reverse power protection of the motor feedback system. Based on the problem, the invention provides a new setting principle of reverse power protection, namely, the reverse power protection is used for tripping under the condition that a single-row motor power supply is lost and a parallel unit provides power for a fault row, the parallel unit capacity is considered, and a fixed value is exceeded. The reverse power protection originally used for protecting the fault line generator is changed into the protection of the parallel non-fault unit, so that the power supply reliability of the double-unit parallel system is improved.

And ② frequency protection. In the past, the frequency protection is arranged at the outlet position of the parallel unit, and in the configuration mode, if the frequency is reduced due to the failure of the single unit, the frequency protection can cause the double units to trip. The design scheme of the invention allocates the frequency protection to the single unit and sets different tripping frequency fixed values, so that when the single unit fails, the failed unit trips, the operation of the non-failed unit is reserved with a certain probability, and the power supply reliability of the double-unit parallel system is improved.

And thirdly, single-phase grounding protection. In the past, because the double-machine parallel system is a neutral point ungrounded system, stator single-phase grounding protection is difficult to arrange, and only an insulation monitor is arranged to operate on a signal. The important defect of the original design is that the fault unit cannot be identified, and the fault column can be verified only by a shutdown mode. If the earth fault occurs in the fault troubleshooting in a superposition mode, a short-circuit accident is caused, and the dual-machine system is stopped. The invention configures special stator single-phase earth protection for a single machine, adopts the longitudinal zero-sequence voltage differential protection principle, can identify the machine set with the stator single-phase earth fault, provides two outlet modes of tripping and alarming for users to select, obviously shortens the field fault troubleshooting time and reduces the occurrence probability of the short-circuit fault.

And fourthly, sudden voltage protection. In the past, because the protective equipment adopts a discrete element, the primary equipment PT/CT configuration cannot meet the requirement of sudden voltage protection configuration, so that sudden voltage protection is not configured, and only simple overcurrent protection is adopted as main protection of sudden voltage. The simple overcurrent protection has the defects of long action time and high action constant value. After the comprehensive protection system device 10 is adopted, the input and the output are intensified, and resources for configuring the sudden voltage protection are provided, so that the sudden voltage protection of the generator is increased.

Furthermore, the embodiment of the invention also provides a protection mechanism of a unit access system part and a special magnetic loss protection mechanism.

Specifically, a protection mechanism of a unit access system part is as follows:

in the past, the part of a parallel double-machine access system is not provided with rapid protection, and only an overcurrent protection extension section of a machine set is used as main protection of inter-phase faults of a bus. Due to the small capacity of the dual-machine system, the short-circuit current is attenuated quickly when a short-circuit fault occurs between adjacent phases, and the serious hidden trouble that overcurrent protection cannot act exists. According to the invention, a three-terminal CT (current transformer) is added to an access system part (three test points are set on 401JA, 601JA and RGL), and independent access system bus differential protection (differential protection triggering, direct cutting off 401JA and 601JA) is configured, so that bus faults can be sensitively reflected and quickly removed, and the problem that the bus faults are burnt out for a long time to cause the difficulty of accident first-aid repair to be increased is avoided.

Special loss-of-field protection mechanisms:

for a rotor-coupled dual-machine parallel system, the past field loss protection only checks the excitation current of a rotor excitation winding. The design method is effective to the excitation short-circuit fault and the excitation winding open-circuit fault before the current sensor, but has no effect on the slight loss-of-field fault, and the non-fault unit can be tripped due to overcurrent protection action under individual working conditions, so that the dual-machine parallel system is finally stopped.

The invention provides a 4-fold magnetic loss protection optimization configuration scheme with different principles by combining the actual wiring mode of a rotor coupling double-machine parallel system.

a. And a rotor coupling loop breaker is arranged and used for decoupling the rotor loop under the abnormal working condition. For a dual-machine system, improving the power supply reliability is the most important consideration. The rotor coupling loop is disconnected and decoupled in time under the fault, so that the condition that the excitation loop is in a short-circuit fault and a non-fault unit is dragged into a field loss state can be effectively avoided.

b. And (4) setting the protection of the circulation direction of the rotor coupling loop, and judging the loss-of-field unit when the coupling loop is not decoupled but has larger circulation. The criterion is superposed with the power supply loss condition of the excitation regulator to form a complete and safe loss tripping judgment condition.

c. And setting a classical loss-of-field impedance criterion formed by a single machine terminal current and voltage criterion. In the past, due to the coupling of the rotors of the dual-machine system, the loss-of-field working condition cannot be judged. In the design scheme of the invention, the decoupling circuit breaker a is added, so that a dual-machine parallel system can be converted into a dual-machine parallel and rotor independent system when the dual-machine parallel system is in magnetic loss, and the classical machine end impedance criterion and the reactive reverse criterion play a role.

d. The rotor exciting current is directly determined. The rotor exciting current is directly collected in the criterion, the faults of the front end short circuit of the current sensor and the open circuit of the exciting circuit are visually reflected, and the 3-fold protection is supplemented.

The invention improves the integrity and reliability of system protection configuration based on the essential principle, introduces stator single-phase grounding protection, can effectively identify a fault unit, and improves the troubleshooting efficiency. For a special excitation system caused by rotor coupling, an original complete protection scheme is pertinently provided. Meanwhile, the system control function is realized in the digital integrated protection platform in a logic self-programming mode, and control equipment with conventional design is completely omitted, so that the reliability of system operation is greatly improved, and the equipment investment is greatly saved.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A rotor coupling double-machine parallel motor generator set complete set and protection control system is characterized by comprising: a comprehensive protection system device; the comprehensive protection system device comprises: the single machine starting logic control module, the single machine shutdown logic control module and the single machine excitation/de-excitation logic control module;

2. The rotor-coupled dual-machine parallel motor generator set and protection control system of claim 1, further comprising: a rotor coupling control module;

and the rotor coupling control module is used for controlling the rotor coupling double-machine parallel motor generator set to execute rotor coupling.

3. The rotor-coupled dual-machine parallel motor generator set and protection control system of claim 1, further comprising: an excitation protection logic control module;

4. The rotor-coupled dual-machine parallel motor generator set and protection control system of claim 1, further comprising: a protection output and alarm output logic module;

5. The rotor-coupled dual-machine parallel motor generator set and protection control system of claim 1, further comprising: an alarm indication logic module;

6. The rotor-coupled dual-machine parallel motor generator set and protection control system of claim 1, further comprising: a system working power supply indication logic module;

7. The rotor-coupled dual-motor parallel motor generator set and protection control system of claim 1, wherein the rotor-coupled dual-motor parallel motor generator set comprises: a first unit and a second unit;

8. The rotor-coupled dual-motor parallel motor generator set and protection control system of claim 1, wherein the rotor-coupled dual-motor parallel motor generator set comprises: a first unit and a second unit;

9. The rotor-coupled dual-motor parallel motor generator set and protection control system of claim 3, wherein the rotor-coupled dual-motor parallel motor generator set comprises: a first unit and a second unit;