CN110601345B - Single-ended main-standby synchronous switching system of static frequency converter and control method - Google Patents
Single-ended main-standby synchronous switching system of static frequency converter and control method Download PDFInfo
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- CN110601345B CN110601345B CN201910837585.5A CN201910837585A CN110601345B CN 110601345 B CN110601345 B CN 110601345B CN 201910837585 A CN201910837585 A CN 201910837585A CN 110601345 B CN110601345 B CN 110601345B
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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
- H02J9/066—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 characterised by the use of dynamo-electric machines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a single-ended main-standby synchronous switching system of a static frequency converter and a control method. The total position state of the primary high-voltage switching system and the secondary signal switching system and the DI/DO signal of the static frequency converter starting system are obtained through the local control unit and fed back to the local control unit, and the monitoring of the local control unit on the system is constructed; the control center of the local control unit can carry out remote control operation on the primary high-voltage switching system, the secondary signal switching system and the static frequency converter starting system; the local control unit sends out a control instruction based on the logic switching judgment result to realize the remote synchronous switching operation of the primary high-voltage switching system, the secondary signal switching system and the static frequency converter starting system; and the synchronous switching control of the single-ended main and standby of the static variable frequency starting system is realized. The invention realizes the function of the mutual backup switching of the single-end transmission double systems of the system, can be popularized and applied to the fields of extraction storage, combustion engines, phase modulators and the like, reduces the engineering and maintenance cost and has flexible operation of one-key switching.
Description
Technical Field
The invention belongs to the technical field of power electronic variable frequency dragging, particularly relates to a static frequency converter system applicable to the fields of combustion engines, phase modulators, pumping storage and the like, and particularly relates to a single-ended main-standby synchronous mutual switching system of a static frequency converter and a control method.
Background
In recent years, the high-power electronic converter technology is developed rapidly, and the high-capacity high-voltage variable frequency speed regulation technology is generally applied in the field of alternating current motor driving. The high-voltage motor can realize stepless speed regulation by using the high-voltage frequency converter, can meet the requirement of the production process on speed regulation control of the motor so as to improve the yield and quality of products, greatly save energy and reduce cost. Static Frequency converter sfc (static Frequency converter) is a device that converts the input of power Frequency ac power into continuously adjustable Frequency ac power and outputs it by means of thyristors. The static frequency converter consists of a rectifier, an inverter, a control protection unit and the like and is used for dragging a large motor. In a gas turbine, a pumping storage and phase modifier unit, an SFC is used as a starting system of the unit to provide power for the starting of the unit in a starting stage, the unit operates as a motor at the moment, and the SFC stops operating after the starting of a standby unit is finished.
The design of the single-ended interface of the static frequency converter enables an input power supply, an output loop and a signal interface to share one group of interfaces, and the function of external single-ended transmission is realized; the synchronous switching system of the main and standby static frequency converters meets the redundancy function, and can solve the problem that when the static frequency conversion system fails, the standby static frequency converter actively takes over the main frequency converter as a hot standby operable state under the condition of not influencing the operation requirement. The system realizes the function of mutual backup switching of single-end transmission double systems, can be widely applied to static variable frequency starting systems in the fields of extraction storage, gas turbine, phase modulator and the like, has flexible operation of one-key switching, and reduces investment cost and operation and maintenance cost.
As shown in fig. 1, the conventional static variable frequency starting system adopts a dual redundancy design, each set of static variable frequency starting system has a separate input transformer, an output cutter loop and a separate signal system, and a #1 static variable frequency starting system and a #2 static variable frequency starting system are independent systems. This greatly increases the investment cost, increases the logic control algorithm, and requires a low fault tolerance.
At present, static variable frequency starting systems in the fields of gas turbines, pumping storage and phase modulators all adopt a double-system design, each set of static variable frequency starting system is provided with an independent input power supply, an output loop, a signal system and the like, and the manufacturing cost of each set of input transformer is approximately 40-400 million according to the capacity requirement; the signal system adopts independent loop transmission, the number of signal interfaces of each set of static variable frequency starting system is large, and the requirement of the capacity of an LCU interface of the local control unit is improved; since the number of signals is multiplied, the complexity of logic control is increased, and the operation load is increased.
Disclosure of Invention
The invention aims to provide a single-ended main-standby synchronous switching system and a control method of a static frequency converter aiming at the problems in the prior art, on one hand, the control method can realize the flexible operation of one-key switching of a main-standby static frequency conversion starting system, and reduce the interface quantity of a local control unit and the complexity of logic control; on the other hand, the synchronous mutual-switching system enables the input power supply, the output loop and the signal interface to share one group of interfaces, realizes the function of external single-end transmission, simultaneously meets the redundancy function, and can solve the problem that when the static frequency conversion system fails, the standby static frequency converter actively takes over the main frequency converter as the hot standby working state under the condition of not influencing the operation requirement.
In order to achieve the purpose, the invention adopts the technical scheme that:
a single-ended master-slave synchronous mutual switching system of a static frequency converter comprises two sets of static frequency converters, a switching system and a local control unit, wherein the switching system comprises a primary high-voltage input switching system, a primary high-voltage output switching system and a secondary signal switching system, control signal input ends of the primary high-voltage input switching system, the primary high-voltage output switching system and the secondary signal switching system are connected in parallel to form a master control signal input end of the switching system, and feedback signal output ends of the primary high-voltage input switching system, the primary high-voltage output switching system and the secondary signal switching system are connected in series to form a master feedback signal output end of the switching system; the site control unit comprises an operation interface, a measurement and control module and a logic module, wherein the signal input end of the measurement and control module is connected with the total feedback signal output end of the switching system, and the control output end of the measurement and control module is connected with the total control signal input end of the switching system; signal loops of the two sets of static frequency converters are switched to signal interface loops through a secondary signal switching system, and the state information output end of the selected static frequency converter is connected with the signal input end of the measurement and control module; the measurement and control module feeds back an input signal to the logic module, and the logic module takes the state information of the selected static frequency converter and a feedback position signal as the basis of the logic unit to gradually judge and execute; and the logic module feeds back a logic judgment result to the measurement and control module, and the control output end of the measurement and control module carries out remote synchronous switching operation on the switching system.
Preferably, a control signal input end of the primary high-voltage input switching system controls the position of the disconnecting link, and a feedback signal output end feeds back the position of the disconnecting link; the control signal input end of the primary high-voltage output switching system controls the position of the disconnecting link, and the feedback signal output end feeds back the position of the disconnecting link; and the control signal input end of the secondary signal switching system controls a signal interface loop, and the feedback signal output end feeds back the position of a signal interface.
Preferably, the primary high-voltage input switching system and the primary high-voltage output switching system both have a single-pole double-throw switching function; the secondary signal switching system has a secondary signal interface switching function, and the position of the disconnecting link and the signal interface are selected through a static frequency converter which needs to be put into operation.
Preferably, the two sets of static frequency converters share the input transformer as a power supply through the primary high-voltage input switching system, share the output unit through the primary high-voltage output switching system, and share the signal interface of the local control unit through the secondary signal switching system to form a single-ended interface system.
A control method of a single-ended main-standby synchronous switching system of a static frequency converter comprises the following steps:
the system comprises a measurement and control module, a power supply module and a power supply module, wherein the measurement and control module is used for acquiring the total position states of a primary high-voltage input switching system, a primary high-voltage output switching system and a secondary signal switching system and the DI/DO signal of a static frequency converter starting system and feeding back the DI/DO signal to a local control unit;
performing remote control operation on the primary high-voltage input switching system, the primary high-voltage output switching system, the secondary signal switching system and the static frequency converter starting system according to a signal fed back by the measurement and control module, and sending a one-key switching signal to the logic module;
and according to the logic switching judgment result of the logic module, sending a control instruction through an operation interface to realize remote synchronous switching operation of the primary high-voltage input switching system, the primary high-voltage output switching system, the secondary signal switching system and the static frequency converter starting system.
Preferably, the switching logic of the logic module includes: when the static frequency converter switched in place is in live operation, the logic circuit locks the switching operation and does not allow the live switching operation; when the static frequency converter switched in place has action failure, the logic circuit detects position feedback of the primary circuit and the signal circuit system, sends a control instruction through the operation interface, switches the primary circuit and the signal circuit to the position of the standby static frequency converter, monitors the position signal and the state information correctly, and realizes the mutual switching between the main circuit and the standby circuit.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the total position state of the primary high-voltage switching system and the secondary signal switching system and the DI/DO signal of the static frequency converter starting system are obtained by the local control unit and fed back to the measurement and control module of the local control unit, so that the monitoring of the local control unit on the system is constructed; the control center of the local control unit can carry out remote control operation on the primary high-voltage switching system, the secondary signal switching system and the static frequency converter starting system; after receiving a one-key switching signal sent by a control center through a logic control module of a local control unit, sending a control instruction to realize remote synchronous switching operation of a primary high-voltage switching system, a secondary signal switching system and a static frequency converter starting system; and the synchronous switching control of the single-ended main and standby of the static variable frequency starting system is realized. The invention realizes the function of the mutual backup switching of the single-end transmission double systems of the system, can be popularized and applied to the fields of extraction storage, combustion engines, phase modulators and the like, reduces the engineering and maintenance cost and has flexible operation of one-key switching.
Drawings
Fig. 1 is a schematic structural diagram of a conventional static variable frequency starting system.
Fig. 2 is a schematic structural diagram of the system of the present invention according to an embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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.
The invention provides a single-ended main-standby synchronous mutual switching system of a static frequency converter, which comprises two sets of static frequency converters, a primary high-voltage input switching system, a primary high-voltage output switching system, a secondary signal switching system and a Local Control Unit (LCU) as shown in figure 2. The primary high-voltage switching system has a single-pole double-throw switching function, the secondary signal switching system can realize the function of switching secondary signal interfaces, and the position of a disconnecting link and the signal interface are selected through a frequency converter needing to be put into operation; the control signal input end of the primary high-voltage input switching system controls the position of the disconnecting link, and the feedback signal output end feeds back the position of the disconnecting link; the control signal input end of the primary high-voltage output switching system controls the position of the disconnecting link, and the feedback signal output end feeds back the position of the disconnecting link; a control signal input end of the secondary signal switching system controls a signal interface loop, and a feedback signal output end feeds back a signal interface position; the control signal input ends of the primary high-voltage input switching system, the primary high-voltage output switching system and the secondary signal switching system are connected in parallel to form a master control signal input end of the switching system, so that synchronous switching operation of control signal instructions can be realized; the feedback signal output ends of the primary high-voltage input switching system, the primary high-voltage output switching system and the secondary signal switching system are connected in series to form a total feedback signal output end of the switching system, so that the consistency of feedback positions can be realized; the local control unit comprises an operation interface, a measurement and control module and a logic module, wherein the signal input end of the measurement and control module is connected with the total feedback signal output end of the switching system, and the control output end of the measurement and control module is connected with the total control input end of the switching system; signal loops of the two sets of static frequency converters are switched to signal interface loops through a secondary signal switching system, and the state information output end of the selected static frequency converter is connected with the signal input end of the measurement and control module; the measurement and control module feeds back the input signal to the logic module, and gradually judges and executes the input signal by taking the state information of the frequency converter and the feedback position signal as the basis of the logic unit; the logic module feeds back the logic judgment result to the measurement and control module, and the control output end of the measurement and control module carries out remote synchronous switching operation on the switching system.
In one embodiment, the two sets of static frequency converters share the input transformer as a power supply through the primary high-voltage input switching system, share the output unit through the primary high-voltage output switching system, and share the signal interface of the local control unit through the secondary signal switching system, so as to form a single-ended interface system.
The invention also provides a control method of the single-ended master-slave synchronous switching system of the static frequency converter, which utilizes the local control unit to measure and control the static frequency converter system, and operation and maintenance personnel carry out remote synchronous switching operation on the static frequency converter, the primary high-voltage input switching system, the primary high-voltage output switching system and the secondary signal switching system through the control center of the control unit LCU, thereby realizing the control of the single-ended master-slave synchronous switching of the starting system of the static frequency converter.
As an embodiment, the control method includes:
1) the local control unit LCU acquires the total position state of a primary high-voltage switching system (comprising a primary high-voltage input switching system and a primary high-voltage output switching system) and a secondary signal switching system and DI/DO signals of a static frequency converter starting system, and feeds the DI/DO signals back to a measurement and control module of the local control unit LCU to construct monitoring of the local control unit LCU on the system;
2) according to the monitoring result of the measurement and control module, the control unit LCU control center can remotely control the primary high-voltage switching system, the secondary signal switching system and the static frequency converter starting system to send a one-key switching signal to the logic module;
3) the logic module carries out switching logic judgment after receiving the one-key switching signal, and sends a control instruction through an operation interface according to the switching logic judgment result to realize remote synchronous switching operation of the primary high-voltage switching system, the secondary signal switching system and the static variable frequency starting system; and the synchronous switching control of the single-ended main and standby of the static variable frequency starting system is realized.
As an implementation manner, the control method performs a master-slave switching operation on the static frequency converter through an operation interface, and determines a switching operation of the control loop through a switching logic.
As an embodiment, the logic module switching logic determining includes: when the static frequency converter switched in place is in live operation, the logic circuit locks the switching operation and does not allow the live switching operation; when the static frequency converter switched in place has an action fault, the logic circuit detects position feedback of the primary circuit and the signal circuit system, the primary circuit and the signal circuit are switched to the position of the standby static frequency converter through an operation interface one-key switching instruction, position signals and state information are correctly monitored, and mutual switching between the main circuit and the standby circuit is realized.
As shown in fig. 2, the switching logic control loop is as follows:
1) when the QK1, the QK2 and the QK3 are all in the A position, the 1# static frequency converter is in the active state, and the 2# static frequency converter is in the standby state; the LCU detects the position information of QK1, QK2 and QK3, the 1# static frequency converter is in a ready state, the LCU sends a switching instruction, the QK1, the QK2 and the QK3 start to execute switch switching, after the switching is finished, the QK1, the QK2 and the QK3 are all in a B position, the 2# static frequency converter is in a main state, and the 1# static frequency converter is in a standby state;
2) when the QK1, the QK2 and the QK3 are all at the B position, the 2# static frequency converter is in an active state, and the 1# static frequency converter is in a standby state; the LCU detects the position information of QK1, QK2 and QK3, the 2# static frequency converter is in a ready state, the LCU sends a switching instruction, the QK1, the QK2 and the QK3 start to execute knife switch switching, after the switching is finished, the QK1, the QK2 and the QK3 are all in an A position, the 1# static frequency converter is in an active state, and the 2# static frequency converter is in a standby state.
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 (4)
1. A single-ended master-slave synchronous mutual switching system of a static frequency converter comprises two sets of static frequency converters, a switching system and a local control unit, and is characterized in that the switching system comprises a primary high-voltage input switching system, a primary high-voltage output switching system and a secondary signal switching system, wherein control signal input ends of the primary high-voltage input switching system, the primary high-voltage output switching system and the secondary signal switching system are connected in parallel to form a master control signal input end of the switching system, and feedback signal output ends of the primary high-voltage input switching system, the primary high-voltage output switching system and the secondary signal switching system are connected in series to form a master feedback signal output end of the switching system; the site control unit comprises an operation interface, a measurement and control module and a logic module, wherein the signal input end of the measurement and control module is connected with the total feedback signal output end of the switching system, and the control output end of the measurement and control module is connected with the total control signal input end of the switching system; signal loops of the two sets of static frequency converters are switched to signal interface loops through a secondary signal switching system, and the state information output end of the selected static frequency converter is connected with the signal input end of the measurement and control module; the measurement and control module feeds back an input signal to the logic module, and the logic module takes the state information of the selected static frequency converter and a feedback position signal as the basis of the logic unit to gradually judge and execute; the logic module feeds back a logic judgment result to the measurement and control module, and a control output end of the measurement and control module carries out remote synchronous switching operation on the switching system;
the control method of the single-ended main-standby synchronous mutual switching system of the static frequency converter comprises the following steps:
the system comprises a measurement and control module, a power supply module and a power supply module, wherein the measurement and control module is used for acquiring the total position states of a primary high-voltage input switching system, a primary high-voltage output switching system and a secondary signal switching system and the DI/DO signal of a static frequency converter starting system and feeding back the DI/DO signal to a local control unit;
performing remote control operation on the primary high-voltage input switching system, the primary high-voltage output switching system, the secondary signal switching system and the static frequency converter starting system according to a signal fed back by the measurement and control module, and sending a one-key switching signal to the logic module;
according to the logic switching judgment result of the logic module, a control instruction is sent through an operation interface to realize remote synchronous switching operation of a primary high-voltage input switching system, a primary high-voltage output switching system, a secondary signal switching system and a static frequency converter starting system;
the switching logic of the logic module comprises: when the static frequency converter switched in place is in live operation, the logic circuit locks the switching operation and does not allow the live switching operation; when the static frequency converter switched in place has action failure, the logic circuit detects position feedback of the primary circuit and the signal circuit system, sends a control instruction through the operation interface, switches the primary circuit and the signal circuit to the position of the standby static frequency converter, monitors the position signal and the state information correctly, and realizes the mutual switching between the main circuit and the standby circuit.
2. The single-ended primary-standby synchronous switching system of the static frequency converter according to claim 1, wherein a control signal input end of the primary high-voltage input switching system controls a position of a switch, and a feedback signal output end feeds back the position of the switch; the control signal input end of the primary high-voltage output switching system controls the position of the disconnecting link, and the feedback signal output end feeds back the position of the disconnecting link; and the control signal input end of the secondary signal switching system controls a signal interface loop, and the feedback signal output end feeds back the position of a signal interface.
3. The single-ended master-slave synchronous switching system of the static frequency converter according to claim 1, wherein the primary high-voltage input switching system and the primary high-voltage output switching system both have a single-pole double-throw switching function; the secondary signal switching system has a secondary signal interface switching function, and the position of the disconnecting link and the signal interface are selected through a static frequency converter which needs to be put into operation.
4. The single-ended primary-standby synchronous mutual switching system of the static frequency converters according to claim 1, wherein the two sets of static frequency converters share an input transformer as a power supply through a primary high-voltage input switching system, share an output unit through a primary high-voltage output switching system, and share a signal interface of a local control unit through a secondary signal switching system to form a single-ended interface system.
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