CN113783292A - Method for realizing multi-path parallel switching of parallel controller - Google Patents
Method for realizing multi-path parallel switching of parallel controller Download PDFInfo
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- CN113783292A CN113783292A CN202111019635.2A CN202111019635A CN113783292A CN 113783292 A CN113783292 A CN 113783292A CN 202111019635 A CN202111019635 A CN 202111019635A CN 113783292 A CN113783292 A CN 113783292A
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- connecting line
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- diesel generator
- parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
Abstract
The invention relates to the technical field of power supply switching, and discloses a method for realizing multi-path parallel switching of a parallel controller, which comprises a diesel generator, a security PC section, a security MCC3A section, a security MCC3B section, a unit working PC3A section and a unit working PC3B section. The diesel generator is connected with a security PC section through a first connecting line, one end of the security PC section is connected with a second connecting line and a third connecting line, the other end of the second connecting line is connected with a security MCC3A section, one end of a security MCC3A section is connected with a fourth connecting line and a fifth connecting line, the other end of the fourth connecting line is connected with a unit working PC3A section, and the other end of the fifth connecting line is connected with a unit working PC3B section. According to the method for realizing the multi-path parallel switching of the parallel controller, the PLC is used for designing a program, an operator does not need to go to a diesel generator room, only the DCS sends an instruction, namely, the working power supply to be connected is automatically selected, the parallel switching is realized, the automation degree is high, the reliability is improved, and the working efficiency is improved.
Description
Technical Field
The invention relates to the technical field of power supply switching, in particular to a method for realizing multi-path parallel switching of a parallel controller.
Background
The diesel generating set is used as a security emergency standby power supply in a power plant, rapid self-starting loaded operation is required in a power failure accident of the whole plant, after the plant power supply is recovered, the diesel generating set can be automatically parallel to a working power supply synchronously according to an instruction of an operator, the load is transferred to the working power supply and then the diesel generating set is automatically or manually stopped, the conventional diesel generating set needs the operator to select a security section to an equipment site in use, the automation degree is low, and the working efficiency is reduced.
Disclosure of Invention
Aiming at the defects of the existing diesel generator and plant power supply switching mode, the invention provides a method for realizing multi-path parallel switching by a parallel controller, which has the advantages of high reliability and high automation degree and solves the problems provided by the background technology.
The invention provides the following technical scheme: a method for realizing multi-path parallel switching of a parallel controller comprises a diesel generator, a security PC section, a security MCC3A section, a security MCC3B section, a unit working PC3A section and a unit working PC3B section, wherein the diesel generator is connected with the security PC section through a first connecting line, one end of the security PC section is connected with a second connecting line and a third connecting line, the other end of the second connecting line is connected with the security MCC3A section, one end of the security MCC3A section is connected with a fourth connecting line and a fifth connecting line, the other end of the fourth connecting line is connected with a unit working PC3A section, and the other end of the fifth connecting line is connected with the unit working PC3B section; the other end of the third connecting line is connected with a security MCC3B segment, one end of a security MCC3B segment is connected with a sixth connecting line and a seventh connecting line, the other end of the sixth connecting line is connected with a unit work PC3A segment, and the other end of the seventh connecting line is connected with a unit work PC3B segment.
Preferably, the first connecting line is provided with QF01, the second connecting line is provided with QF1 and QF31, the third connecting line is provided with QF2 and QF41, the fourth connecting line is provided with QF11 and QF12, the fifth connecting line is provided with QF13 and QF14, the sixth connecting line is provided with QF21 and QF22, and the seventh connecting line is provided with QF23 and QF 24.
Preferably, QF01, QF1 and QF2 are installed in the diesel generator control cabinet, QF12 and QF14 are installed in the security MCC3A segment control cabinet, and QF22 and QF24 are installed in the security MCC3B segment control cabinet.
Preferably, the second connecting wire, the third connecting wire, the fourth connecting wire, the fifth connecting wire, the sixth connecting wire and the seventh connecting wire are all provided with maintenance circuit breakers.
Preferably, QF11, QF13, QF21, QF23, QF31, QF41 are in the closed position when in operation; QF01, QF1, QF2, QF12, QF14, QF22 and QF24 are controlled by a diesel generator control system, the control system comprises a parallel controller, a PLC, a relay and other components, the core of the system is a parallel controller and the PLC, the parallel controller mainly achieves start-stop, measurement, control and protection of the diesel generator, the system has the functions of voltage regulation, frequency regulation and synchronous closing, and the PLC selects different working power supplies to perform synchronous operation through a set program to achieve the function of multi-path parallel switching.
Preferably, the diesel generator control system controls QF01, QF1, QF2, QF12, QF14, QF22 and QF24, when the working power supply supplies power to the security section, only one of QF12 and QF14 can be switched on, and only one of QF22 and QF24 can be switched on. When the diesel generator supplies power, the QF01, the QF1 and the QF2 are switched on, and the control system is composed of parallel machine controllers, a PLC, a relay and other components, so that parallel switching is realized.
Compared with the existing diesel generator and plant power supply switching mode, the invention has the following beneficial effects:
according to the method for realizing the multi-path parallel switching of the parallel controller, the PLC is used for designing a program, an operator does not need to go to a diesel generator room, only an instruction is sent out on the DCS, namely, a power supply to be connected is automatically selected, the parallel switching is realized, the automation degree is high, the reliability is improved, and the working efficiency is improved.
The method for realizing multi-path parallel switching of the parallel controller is characterized in that a diesel generator control system controls QF01, QF1, QF2, QF12, QF14, QF22 and QF24, when a working power supply supplies power to a security section, only one of QF12 and QF14 can be switched on, only one of QF22 and QF24 can be switched on, when the diesel generator supplies power, the QF01, QF1 and QF2 are switched on, the control system is composed of a parallel controller, a PLC, a relay and other components, and parallel switching is realized.
Drawings
FIG. 1 is a schematic wiring diagram of a diesel generator according to the present invention;
fig. 2 is a schematic diagram of a parallel switching process of the present invention, taking the segment MCC3A as an example.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for realizing multi-channel parallel switching of a parallel controller includes a diesel generator, a security PC section, a security MCC3A section, a security MCC3B section, a unit working PC3A section and a unit working PC3B section, wherein the diesel generator is connected with the security PC section through a first connection line, one end of the security PC section is connected with a second connection line and a third connection line, the other end of the second connection line is connected with the security MCC3A section, one end of the security MCC3A section is connected with a fourth connection line and a fifth connection line, the other end of the fourth connection line is connected with the unit working PC3A section, and the other end of the fifth connection line is connected with the unit working PC3B section; the other end of the third connecting line is connected with a security MCC3B segment, one end of a security MCC3B segment is connected with a sixth connecting line and a seventh connecting line, the other end of the sixth connecting line is connected with a unit work PC3A segment, and the other end of the seventh connecting line is connected with a unit work PC3B segment.
Furthermore, the first connecting line is provided with QF01, the second connecting line is provided with QF1 and QF31, the third connecting line is provided with QF2 and QF41, the fourth connecting line is provided with QF11 and QF12, the fifth connecting line is provided with QF13 and QF14, the sixth connecting line is provided with QF21 and QF22, and the seventh connecting line is provided with QF23 and QF 24.
Further, QF01, QF1 and QF2 are installed in a diesel generator control cabinet, QF12 and QF14 are installed in a security MCC3A segment control cabinet, and QF22 and QF24 are installed in a security MCC3B segment control cabinet
Furthermore, the second connecting wire, the third connecting wire, the fourth connecting wire, the fifth connecting wire, the sixth connecting wire and the seventh connecting wire are all provided with maintenance circuit breakers.
Further, QF11, QF13, QF21, QF23, QF31, QF41 are in the closed position when in operation; QF01, QF1, QF2, QF12, QF14, QF22 and QF24 are controlled by a diesel generator control system, the control system comprises a parallel controller, a PLC, a relay and other components, the core of the system is a parallel controller and the PLC, the parallel controller mainly achieves start-stop, measurement, control and protection of the diesel generator, the system has the functions of voltage regulation, frequency regulation and synchronous closing, and the PLC selects different working power supplies to perform synchronous operation through a set program to achieve the function of multi-path parallel switching.
Further, the diesel generator control system controls QF01, QF1, QF2, QF12, QF14, 1F22 and QF24, when a working power supply supplies power to a security section, only one of QF12 and QF14 can be switched on, only one of QF22 and QF24 can be switched on, when the diesel generator supplies power, the QF01, QF1 and QF2 are switched on, the control system is composed of parallel operation controllers, a PLC, a relay and other components, and parallel switching is achieved.
When service power is on, loads of a security MCC3A segment and an MCC3B segment are supplied with power by a working PC3A segment or a PC3B segment, a diesel generator is in a standby state, when the security MCC3A segment or the MCC3B segment is off, the diesel generator is supplied with power, and maintenance switches QF11, QF13, QF21, QF23, QF31 and QF41 are in a closed position when working; QF01, QF1, QF2, QF12, QF14, QF22 and QF24 are all controlled by a diesel generator control system, for example, when service power is electrified, QF12 or QF14 is switched on and QF1 is switched off, and the section of security MCC3A is taken as an example; when the diesel generator supplies power, QF01 and QF1 are switched on, QF12 and QF14 are switched off, and QF12, QF14 and QF1 are provided with a switching-on interlock.
When the diesel generator supplies power and the plant power is recovered, if the diesel generator supplies power to be switched to the plant power, the voltages of the diesel generator and the plant power are required to be synchronously compared through a parallel controller, the 2-path working power PC3A, the PC3B and the diesel generator supply power in a security MCC3A section, if the PC3A supplies power to be recovered, the switching instruction of the section is sent by a DCS centralized control center, a diesel generator control system automatically compares the diesel generator and the PC3A power synchronously, and automatically adjusts the voltage and the frequency of the diesel generator, when the voltages, the phases and the frequencies of the two are the same or close, a QF12 synchronous switching-on signal is automatically sent, the QF1 is skipped after the QF12 is switched on for 1S, and the security MCC3A section realizes seamless parallel switching.
When the diesel generator supplies power, if the power supply of the PC3B needs to be recovered, the method is also adopted, only a corresponding section switching instruction needs to be sent out in a DCS centralized control center, the same is true for the security MCC3B section parallel switching, and by analogy, the parallel switching of a plurality of security section power supplies can be realized, and when QF1 and QF2 are in the jumping positions, the QF01 is manually jumped, and the diesel generator is stopped.
Referring to fig. 2, fig. 2 shows a parallel switching flow chart taking security MCC3A as an example, a diesel generator (abbreviated as diesel generator in the figure) is in an automatic mode, the diesel generator supplies power to security MCC3A, a control system determines whether a working power supply of a PC3A section is recovered, if the determination result is yes, the control system then determines whether QF12 is switched in parallel, if the determination result is yes, the control system then determines whether QF12 is in a closed position, if the determination result is no, the control system controls QF12 to be synchronously switched on, at this time, the determination result of whether QF12 is in a closed position is yes, if the determination result of whether the working power supply of the PC3A section is recovered is no, the control system determines whether the working power supply of the PC3B section is recovered, if the determination result is yes, then determines whether QF14 is switched in parallel, if the determination result is yes, then determines whether QF14 is in a closed position, if the determination result is no, the control system controls QF14 to be synchronously switched on, and only one of the closed periods is switched on between QF12 and 14, and the control system then judges whether QF1 is in bit skipping, if not, the time is delayed for 1S, after QF1 and QF1 are in bit skipping, if security MCC3B requires parallel switching, the control system refers to security MCC3A switching process, and after QF2 is in bit skipping, manually skips QF01 and stops the diesel generator.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for realizing multi-path parallel switching of a parallel controller comprises a diesel generator, a security PC section, a security MCC3A section, a security MCC3B section, a unit working PC3A section and a unit working PC3B section, and is characterized in that: the diesel generator is connected with a security PC section through a first connecting line, one end of the security PC section is connected with a second connecting line and a third connecting line, the other end of the second connecting line is connected with a security MCC3A section, one end of a security MCC3A section is connected with a fourth connecting line and a fifth connecting line, the other end of the fourth connecting line is connected with a unit working PC3A section, and the other end of the fifth connecting line is connected with a unit working PC3B section; the other end of the third connecting line is connected with a security MCC3B segment, one end of a security MCC3B segment is connected with a sixth connecting line and a seventh connecting line, the other end of the sixth connecting line is connected with a unit work PC3A segment, and the other end of the seventh connecting line is connected with a unit work PC3B segment.
2. The method of claim 1, wherein the parallel controller implements multi-path parallel switching, and comprises: the first connecting line is provided with QF01, the second connecting line is provided with QF1 and QF31, the third connecting line is provided with QF2 and QF41, the fourth connecting line is provided with QF11 and QF12, the fifth connecting line is provided with QF13 and QF14, the sixth connecting line is provided with QF21 and QF22, and the seventh connecting line is provided with QF23 and QF 24.
3. The method for realizing multi-path parallel switching of the parallel controller according to claim 2, wherein: QF01, QF1 and QF2 are installed in the diesel generator control cabinet, QF12 and QF14 are installed in the security MCC3A segment control cabinet, and QF22 and QF24 are installed in the security MCC3B segment control cabinet.
4. The method of claim 1, wherein the parallel controller implements multi-path parallel switching, and comprises: and the second connecting wire, the third connecting wire, the fourth connecting wire, the fifth connecting wire, the sixth connecting wire and the seventh connecting wire are all provided with maintenance circuit breakers.
5. The method of claim 1, wherein the parallel controller implements multi-path parallel switching, and comprises: the maintenance breakers QF11, QF13, QF21, QF23, QF31 and QF41 are in a closed position when in work; QF01, QF1, QF2, QF12, QF14, QF22 and QF24 are all controlled by a diesel generator control system, and the control system is composed of a parallel controller, a PLC, a relay and other components.
6. The method of claim 1, wherein the parallel controller implements multi-path parallel switching, and comprises: the diesel generator set control system controls QF01, QF1, QF2, QF12, QF14, 1F22 and QF24, when a working power supply supplies power to a security section, only one of QF12 and QF14 can be switched on, only one of QF22 and QF24 can be switched on, when the diesel generator set supplies power, the QF01, QF1 and QF2 are switched on, the control system is composed of parallel controllers, a PLC, a relay and other components, and parallel switching is achieved.
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| CN202111019635.2A CN113783292A (en) | 2021-09-01 | 2021-09-01 | Method for realizing multi-path parallel switching of parallel controller |
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| CN202111019635.2A CN113783292A (en) | 2021-09-01 | 2021-09-01 | Method for realizing multi-path parallel switching of parallel controller |
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2021
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