CN107947340B - Power supply fast switching system and switching method thereof - Google Patents
Power supply fast switching system and switching method thereof Download PDFInfo
- Publication number
- CN107947340B CN107947340B CN201711030092.8A CN201711030092A CN107947340B CN 107947340 B CN107947340 B CN 107947340B CN 201711030092 A CN201711030092 A CN 201711030092A CN 107947340 B CN107947340 B CN 107947340B
- Authority
- CN
- China
- Prior art keywords
- switching
- mode
- switch
- bus
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- H02J9/02—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which an auxiliary distribution system and its associated lamps are brought into service
-
- 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
-
- 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
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stand-By Power Supply Arrangements (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a power supply rapid switching system which comprises a CPU, a DSP, an A/D converter, a mutual inductor, an optical coupling isolator, an outlet relay, a QDJ, a power supply module and a man-machine interaction module, wherein the power supply module is used for supplying power to the CPU; the CPU and the DSP are control modules, the CPU is connected with a human-computer interface interaction module and is interconnected with the DSP to realize signal bidirectional transmission, the DSP is connected with the A/D converter and the optocoupler isolator to receive digital signals output by the A/D converter and the optocoupler isolator and output to control the actions of the outlet relay and the QDJ; the working modes of the control module comprise a normal manual switching mode, an accident switching mode and an abnormal switching mode; the switching method comprises parallel automatic switching, parallel semi-automatic switching, series switching and simultaneous switching. The invention has the advantages that: 1. the system equipment is simple and operated; 2. the switching condition is delicate and simple; 3. the rapid hot-switching and synchronous capturing technology can realize that the standby power supply is automatically switched into the bus without power failure, and the power supply reliability is improved.
Description
Technical Field
The invention relates to the field of power supply quality management of power systems, in particular to a power supply fast switching system and a switching method thereof.
Background
At present, a spare power automatic switching device is arranged between the incoming line of the domestic transformer substation and the bus-coupled switch. The automatic spare power switching device is generally switched on and off without voltage detection and with proper time delay, namely the automatic spare power switching device is equivalent to a low-voltage cold switching of a bus, and meanwhile, the automatic spare power switching device has no synchronous detection function. The application of the spare power automatic switching device in the transformer substation has the following problems:
1) when a part of 110kV transformer substations which are connected to a power plant are automatically switched into a standby power supply under the accident condition, the switching-on impact is large due to non-synchronous reasons, and the standby power supply protects actions, so that a major accident of power failure of the whole substation is easily caused; when the spare power automatic switching device is out of operation, and one path of power supply fails, the transformer substation has half power failure (split operation mode) or has total power station power failure (one operation and one standby operation mode).
2) In a part of 35kV substations, because a superior power supply is from different 110kV and 220kV substations, a 30-degree fixed angle difference exists between inlet wires of double-loop power supplies of the 35kV substations, the double loops cannot be subjected to parallel loop closing operation, and therefore one section of bus has to be powered off during the double-loop power supply switching operation, and the operation is complicated. Although the spare power automatic switching device of the transformer station can play a role in automatic switching of the spare power supply under the accident condition, the spare power automatic switching device has no phase frequency detection, and the spare power automatic switching device is easily damaged by impact or aged in insulation when a transformer is switched, so that the service life is shortened.
Disclosure of Invention
In order to solve the above problems, the present invention provides a power fast switching system for adaptively switching a standby power and an incoming power and a method thereof.
The invention discloses a power supply rapid switching system which comprises a CPU, a DSP, an A/D converter, a mutual inductor, an optical coupling isolator, an outlet relay, a QDJ, a power supply module and a human-computer interaction module, wherein the power supply module is connected with the output end of the CPU; the CPU and the DSP belong to a control module, the CPU is connected with a human-computer interface interaction module, a communication module and a printer and realizes the functions of wave recording and the like, the DSP is connected with the A/D converter and the optocoupler isolator and receives digital signals output by the A/D converter and the optocoupler isolator and outputs and controls the actions of the outlet relay and the QDJ; the output analog signal of the mutual inductor is connected with an A/D converter, so that the analog quantity data acquisition function is realized; the optical coupler isolator safely isolates the DSP from the outside; the external input comprises 9 paths of signals, and the input of the external input is connected with the optical coupling isolator; the power supply module is a 110V/220V direct current power supply, comprises two pairs of alarm and locking contacts and is connected with each module of the system; the human-computer interaction module comprises a liquid crystal display module, a keyboard, an indicator light and an ARM processor, and the keyboard is connected with the CPU for data information interaction; the outlet relay is used for carrying out quick automatic switching and is connected with the DSP to control output action; the QDJ is connected with an inlet wire power supply and an outlet relay; the + E is an incoming line power supply, and the system controls the quick and safe cutting off of the incoming line power supply; the printing serial port is used for connecting the printer and the CPU.
The invention also discloses a method for fast switching the bus power supply, and the working modes of the CPU and the DSP control module comprise a normal manual switching mode, an accident switching mode and an abnormal switching mode; the switching modes comprise parallel automatic switching, parallel semi-automatic switching, series switching and simultaneous switching;
the parallel connection automatic switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) when the parallel switching condition is satisfied, the CB3(CB1) switch is closed,
(3) when the time delay meets the fixed value of 'shunt trip time delay', and the success of switching on of the CB3(CB1) switch is confirmed, the CB1(CB3) switch is automatically tripped;
the parallel semi-automatic switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) when the parallel switching condition is met, the operation of closing the CB3(CB1) switch and tripping the CB1(CB3) switch is manually finished,
(3) if the CB1(CB3) switch is not opened in 25s, the device alarms and locks the switching;
the series switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) a switch command of jumping CB1(CB3) is sent out, when the switch of CB1(CB3) is jumped off and the switching condition is met, the switch of CB3(CB1) is closed,
(3) when the switching is started, the fast switching is started when the frequency difference between the voltage of the bus 1 and the target branch voltage is less than the fixed value of the fast switching frequency difference and the phase difference is less than the fixed value of the fast switching phase difference,
(4) when the phase difference between the bus 1 voltage and the target branch voltage is equal to the fixed value of the same-capture leading phase angle and the frequency difference between the bus 1 voltage and the target branch voltage is less than the fixed value of the same-capture allowable frequency difference, the switching of the leading phase angle is started,
(5) when the phase difference between the voltage of the bus 1 and the target branch voltage is zero and the frequency difference between the voltage of the bus 1 and the target branch voltage is smaller than the fixed value of the same-catching allowable frequency difference after the time delay set by the fixed value of the 'time before catching switch', starting the time switching before catching,
(6) when the voltage amplitude of the bus 1 is lower than a constant value of residual voltage switching amplitude, residual voltage switching is started, and when the four switching conditions are not met in the time delay set by the constant value of long delay time, long delay switching is started;
the simultaneous switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) and (3) sending a CB1(CB3) switching command, and after a constant value of 'simultaneous switching and closing time delay', sending a CB3(CB1) switching command when a switching condition is met no matter whether a CB1(CB3) switch is tripped or not.
The method for quickly switching the bus power supply comprises a normal manual switching mode, an accident switching mode and an abnormal switching mode; when the working mode is a normal manual switching mode, the control mode judges that the starting mode is started locally through a device menu or remotely through a control station/DCS (distributed control system); when the working mode is an accident switching mode, the control mode judges that the starting mode is started through the protection contact; when the working mode is an abnormal switching mode, judging the starting mode to comprise bus voltage loss automatic starting, line no-current automatic starting and switch skip starting when the working mode is the abnormal switching mode; when the working mode is a normal manual switching mode, the switching determination condition can be divided into two types, the first type is parallel switching, and the second type is fast switching, leading phase angle switching, leading time switching, residual voltage switching and long delay switching. The switching modes of the first switching judgment condition are parallel automatic switching and parallel semi-automatic switching, and the switching modes of the second switching judgment condition are series switching and simultaneous switching; when the working mode is accident switching, the switching judgment condition is quick switching, phase angle switching before, time switching before, residual voltage switching and long delay switching, and the switching mode is series switching and simultaneous switching; when the working mode is abnormal switching, the switching judgment condition is quick switching, forward phase angle switching, forward time switching, residual voltage switching and long delay switching; when the starting mode is judged to be bus voltage loss automatic starting in the working mode, the switching mode is series switching and simultaneous switching; when the working mode judges that the starting mode is line non-flow automatic starting, the switching mode is series switching and simultaneous switching; when the starting mode is judged to be switch skip starting in the working mode, the switching mode is series switching.
The invention has the advantages that: the advanced switching theory of 'rapid hot throw' and 'synchronous capture' is applied to a switching system of a power supply of a transformer substation, so that the problem of non-synchronous parallel arrangement of the power supply plants when an incoming line power supply line fails in the operating mode that the 110kV transformer substation has power supply plant access is solved; the problem of when having the angle difference of 30 between 35kV transformer substation's dual supply inlet wire, switching operation needs the power failure temporarily is solved. The method innovatively adopts a rapid hot-throw technology to prevent the impact of inrush current on a generator set, a capacitor bank and a switch; the overcurrent locking technology in the current direction of the power supply is utilized, the standby circuit is prevented from being thrown to a fault bus, and the method has important significance for ensuring the reliable power supply of the transformer substation.
Drawings
Fig. 1 is a schematic diagram of a power fast switching system according to an embodiment of the invention.
Fig. 2 is a layout diagram of a panel of a power fast switching apparatus according to an embodiment of the invention.
Fig. 3 is a layout diagram of a backplane of a fast power switching device according to an embodiment of the invention.
Fig. 4 is a schematic diagram illustrating an application of a power fast switching apparatus according to an embodiment of the present invention.
FIG. 5 is a schematic diagram illustrating an exemplary embodiment of a no-flow fast handoff start.
Fig. 6 is a schematic diagram of a switch for fast switching start according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, which are merely preferred embodiments of the invention, and all equivalent changes in the features and principles described in the claims of the invention are included in the scope of the invention.
As shown in fig. 1, a power supply fast switching system comprises a CPU, a DSP, an a/D converter, a transformer, an opto-isolator, an outlet relay, a QDJ, a power supply module, and a human-computer interaction module; the CPU is used for controlling and managing the whole system, and connecting human-computer interface interaction, communication, wave recording and other functions; the DSP is used for realizing digital signal processing, logic calculation and tripping outlet, adopts optical fiber interface synchronous communication, and is used for connecting the A/D converter and receiving the output digital signal; the mutual inductor is used for completing the safe measurement work of the electric indexes and realizing the analog quantity data acquisition function; the optical coupling isolator is used for transmitting external input to the DSP and realizing safe isolation; the external input comprises 9 paths of signals; the power supply module is a 110V/220V direct-current power supply and comprises two pairs of alarm and locking contacts; the human-computer interaction module comprises a liquid crystal display module, a keyboard, an indicator light and an ARM processor, wherein the ARM processor is used for completing the realization control of the liquid crystal display module, the processing of the keyboard and the interaction of data information with the CPU through a serial port; the outlet relay is used for carrying out quick automatic switching and is controlled to act by the DSP; the QDJ is used for safely cutting off an inlet wire power supply and an outlet relay; and the + E is an incoming line power supply.
The invention also discloses a method for quickly switching the bus power supply, which comprises a normal manual switching mode, an accident switching mode and an abnormal switching mode; when the working mode is a normal manual switching mode, the control mode judges that the starting mode is started locally through a device menu or remotely through a control console/DCS (distributed control system); when the working mode is an accident switching mode, the control mode judges that the starting mode is started through a protection contact; when the working mode is an abnormal switching mode, judging the starting mode to comprise bus voltage loss automatic starting, line no-current automatic starting and switch stealing tripping starting when the working mode is the abnormal switching mode; when the working mode is a normal manual switching mode, the switching judgment condition can be divided into two types, wherein the first type is parallel switching, and the second type is rapid switching, leading phase angle switching, leading time switching, residual voltage switching and long delay switching. The switching modes of the first switching judgment condition are parallel automatic switching and parallel semi-automatic switching, and the switching modes of the second switching judgment condition are series switching and simultaneous switching; when the working mode is accident switching, the switching judgment condition is quick switching, phase angle switching before, time switching before, residual voltage switching and long delay switching, and the switching mode is series switching and simultaneous switching; when the working mode is abnormal switching, the switching judgment condition is quick switching, forward phase angle switching, forward time switching, residual voltage switching and long delay switching; when the working mode judges that the starting mode is bus voltage loss automatic starting, the switching mode is series switching and simultaneous switching; when the working mode judges that the starting mode is line non-flow automatic starting, the switching mode is series switching and simultaneous switching; and when the starting mode is judged to be switch skip starting in the working mode, the switching mode is series switching.
As shown in fig. 4, the left diagram is the fast switching of the section switch, that is, two sections of buses are respectively supplied with power by respective power supply branches, the branch 1 switch CB1 and the branch 2 switch CB2 are both closed, and the bus coupler CB3 is in a tap position. When any power supply branch fails, the PCS-9655S power supply quick switching device trips CB1 (or CB 2) according to the failure condition, the bus coupler CB3 is switched on, and the two buses are supplied with power by the power supply branch without failure, so that the two buses are guaranteed not to lose power. The switching of the power supply branch can also be carried out by manually controlling the switching of the CB1 (or CB 2) and the CB 3. As shown in fig. 4, the right diagram shows the fast switching of the incoming line switch, that is, the buscouple switch CB3 is always on, and the switching is performed bidirectionally between CB1 and CB 2. When the power supply branch circuit is in fault, the PCS-9655S power supply quick switching device trips off a power supply branch circuit switch according to the fault condition, the standby power supply branch circuit switch is closed, and the two buses are supplied with power by the faultless power supply branch circuit, so that the two buses are ensured not to lose power. The switching of the power supply branch can also be carried out by manually controlling the switching of the CB1 and the CB 2.
The normal manual switching refers to power switching performed under normal conditions. The switch is manually started through a device screen menu or a console switch or an ECS/DCS system, and the bidirectional switch between the switches CB1 and CB3 is completed. The normal manual switching can be started remotely or started locally.
When the remote control is switched on and off, the manual switching control authority is in local control, the switching can be started only through a device screen menu, and the operation process is detailed in 6.2.5 section of the manual switching part of local command. The switching mode is determined by a fixed value of a local switching mode;
when the 'remote control for throwing in' is started, the control authority of manual switching is 'remote control', a 'branch 1 manual switching' is accessed through a console switch, an on-screen button or an ECS/DCS system, and switching is started manually. The switching modes are divided into two groups: when the manual switching mode is selected to switch in and put in, the switching mode is series switching or simultaneous switching and is determined by a fixed value of a remote series and parallel switching mode; when the manual switching mode is selected, the switching mode is parallel automatic switching or parallel semi-automatic switching and is determined by a fixed value of a remote parallel switching mode.
The handover procedure is briefly described as follows:
1) parallel automatic switching
The switching is manually started, when the parallel switching condition is met, the CB3(CB1) switch is closed, the delay meets the fixed value of 'parallel trip delay', and after the CB3(CB1) switch is confirmed to be successfully closed, the CB1(CB3) switch is automatically opened.
2) Parallel semi-automatic switching
The switching is manually started, and when the parallel switching condition is met, the operation of closing the CB3(CB1) switch and tripping the CB1(CB3) switch is manually finished. If the CB1(CB3) switch is not opened in 25s, the device alarms and locks the switching;
in any of the above modes, the parallel switching condition means:
(1) the differential pressure between the bus 1 and the target branch is less than or equal to the fixed value of the parallel switching differential pressure;
(2) the frequency difference between the bus 1 and the target branch is less than or equal to the fixed value of the parallel switching frequency difference;
(3) the phase difference between the bus 1 and the target branch is not more than the fixed value of the parallel switching phase difference;
(4) the device is unlocked.
If the parallel switching condition is not satisfied after starting, the device switches the lock and waits for resetting.
3) Serial switching
The switching is manually started, a CB switch jumping 1(CB3) command is sent out, and when the CB1(CB3) switch jumps and the switching condition is met, the CB3(CB1) switch is closed. The switching conditions include: fast switching, phase angle switching ahead, time switching ahead, residual voltage switching, and long delay switching. When the fast switching is unsuccessful, the switching is automatically switched to the over-the-front phase angle switching, the over-the-front time switching, the residual voltage switching and the long delay switching.
The fast switching conditions are: after starting switching, the fast switching condition is met when the frequency difference between the voltage of the bus 1 and the target branch voltage is smaller than a fixed value of 'fast switching frequency difference' and the phase difference is smaller than the fixed value of 'fast switching phase difference'.
The over-front phase angle switching conditions are as follows: the phase difference between the bus 1 voltage and the target branch voltage is equal to a fixed value of a same-capture leading phase angle, and the switching condition of the leading phase angle is met when the frequency difference between the bus 1 voltage and the target branch voltage is smaller than the fixed value of the same-capture allowed frequency difference.
The earlier time switching conditions are: and calculating the phase difference between the bus 1 voltage and the target branch voltage after the time delay set by the fixed value of the previous time of switching in real time according to the frequency difference and the phase angle difference between the current bus 1 voltage and the target branch voltage, wherein the phase difference is zero, and the previous time switching condition that the frequency difference between the bus 1 voltage and the target branch voltage is smaller than the fixed value of the same capture allowable frequency difference is met.
The residual voltage switching conditions are as follows: and when the voltage amplitude of the bus 1 is lower than the fixed value of the residual voltage switching amplitude, the residual voltage switching condition is met.
The long-delay switching conditions are as follows: in the time delay set by the fixed value of the 'long time delay', if the four switching conditions are not met, the long time delay switching condition is met after the time delay is finished.
The "fast switching, phase-angle-over-front switching, time-over-front switching, residual voltage switching, long delay switching" switching conditions hereinafter are all consistent with the above description.
4) Simultaneous handover
The switching is manually started, a CB1(CB3) switch jumping command is sent, and after a constant value of 'simultaneous switching and closing time delay', a CB3(CB1) switch command is sent when the switching condition is met no matter whether the CB1(CB3) switches are tripped or not. The switching conditions include: fast switching, phase angle switching ahead, time switching ahead, residual voltage switching, and long delay switching. When the fast switching is unsuccessful, the switching is automatically switched to the over-front phase angle switching, the over-front time switching, the residual voltage switching and the long delay switching.
The handover procedure is detailed as follows:
(1) during the starting, the remote control is thrown and the manual switching mode is selected, wherein the remote control is "= ON. In the fixed values, "total switching input" = input, "normal switching" = input, "distant string and switching pattern" = series. "Branch 1 manually switches" the open input closed short pulse. The remote serial-to-serial switching mode, the normal manual switching mode and the serial switching mode.
(2) During the starting, the remote control is thrown and the manual switching mode is selected, wherein the remote control is "= ON. In the fixed values, "total switching input" = input, "normal switching" = input, "far string and switching mode" = simultaneous. "Branch 1 manually switches" the open input closed short pulse. The remote serial and simultaneous switching mode, the normal manual switching mode and the simultaneous switching mode.
(3) During the starting, the remote control is turned OFF, and the manual switching mode is selected. In the fixed values, "total switching input" = input, "normal switching" = input, "distant parallel switching mode" = automatic. "Branch 1 manually switches" the open input closed short pulse. The remote serial and parallel switching mode, normal manual switching and parallel switching mode.
(4) During the starting, remote control is thrown to "= ON", and manual switching mode selection is selected "= OFF. In the fixed values, "total switching input" = input, "normal switching" = input, "distant parallel switching mode" = semi-automatic. "Branch 1 manually switches" the open input closed short pulse. The remote serial and parallel switching mode, normal manual switching and parallel semi-automatic switching mode.
(5) During the opening, remote control is thrown "= OFF. In the fixed values, "total switching input" = input, "normal switching" = input, "local switching method" = series connection. The "Branch 1 Manual switch" menu operates as a prompt. The local switching mode, the normal manual switching mode and the serial switching mode.
(6) During the opening, remote control is thrown "= OFF. In the fixed values, "total switching input" = input, "normal switching" = input, "local switching mode" = simultaneous operation. The "Branch 1 Manual switch" menu operates as a prompt. The mode is switched locally, normally manually and simultaneously.
(7) During starting, "remote control" = OFF. In the fixed values, "total switching input" = input, "normal switching" = input, "local switching mode" = automatic. The "Branch 1 Manual switch" menu operates as a prompt. The local switching mode, the normal manual switching mode and the parallel automatic switching mode.
(8) During starting, "remote control" = OFF. In the fixed values, "total switching input" = input, "normal switching" = input, "local switching mode" = semi-automatic. The "Branch 1 Manual switch" menu operates as a prompt. The local switching mode, the normal manual switching mode and the parallel semi-automatic switching mode.
A failover refers to a switchover due to a branch failure. The exit contact of the protection device on the branch 1 is connected with the 'branch 1 protection starting' of the device, and the protection exit starts switching, so that the switching can be only switched from CB1 to CB 3.
The accident switching is divided into two modes of series switching and simultaneous switching, and is determined by a fixed value of an accident switching mode.
The handover procedure is briefly described as follows:
1) serial switching
Starting by a protection outlet reflecting the fault of the branch 1, sending a CB1 switch jumping command, and closing the CB3 switch when the CB1 switch jumps and the switching condition is met. The switching conditions include: fast switching, forward phase angle switching, forward time switching, residual voltage switching, long delay switching. When the fast switching is unsuccessful, the switching is automatically switched to the over-the-front phase angle switching, the over-the-front time switching, the residual voltage switching and the long delay switching. Namely, when "total switching investment" = investment, "accident switching method" = series connection in the fixed value. The "Branch 1 guard Start" open input close burst.
2) Simultaneous handover
The protection switch is started by a protection outlet reflecting the fault of the branch 1, a CB1 switching jump command is sent, and after the fixed value 'simultaneous switching and closing delay', no matter whether the CB1 switch jumps or not, a CB3 switching command is sent when the switching condition is met. The switching conditions include: fast switching, phase angle switching ahead, time switching ahead, residual voltage switching, and long delay switching. When the fast switching is unsuccessful, the switching is automatically switched to the over-the-front phase angle switching, the over-the-front time switching, the residual voltage switching and the long delay switching. That is, when "total switching investment" = investment, "accident switching method" = simultaneous in the fixed value. The "Branch 1 guard Start" open input close burst.
The abnormal switching comprises three modes, namely bus voltage loss switching, no-current starting switching and switch skip switching.
The bus voltage is continuously lower than a constant value of 'no-voltage starting amplitude' and the time of no current (6% In) of inlet wire exceeds the constant value of 'no-voltage starting delay', and the device automatically starts and switches.
The bus voltage-loss switching is divided into a series connection mode and a simultaneous mode, the mode is determined by a fixed value of a voltage-loss switching mode, the switching process is the same as the accident switching, and the switching can be only from CB1 to CB 3.
The starting conditions were as follows:
when "total switching input" = input, "voltage loss switching pattern" = series connection in the fixed value. And if the three-phase voltage of the bus 1 is continuously lower than the constant value of the voltage loss starting amplitude and no current flows in the branch 1, the abnormal switching-bus voltage loss switching mode is a serial switching mode.
When "total switching input" = input, "voltage loss switching pattern" = simultaneous in the fixed value. And if the three-phase voltage of the bus 1 is continuously lower than the constant value of the voltage loss starting amplitude and no current flows in the branch 1, the abnormal switching-bus voltage loss switching mode is the simultaneous switching mode.
As shown in fig. 5, in the logic diagram of line 1 switching start without current, the subsequent jump and combination operations are determined by the fixed value of [ switching mode without current ] in serial or simultaneous mode, and the switching process is the same as the accident switching, and only the CB1 can be switched to the CB 3. Line 2 no-flow enabled switching is logically similar to line 1 no-flow enabled switching.
As shown in fig. 6, when the switch of CB1 is tripped by mistake due to an erroneous operation or a failure of the switching mechanism, the apparatus automatically starts switching, and when the switching condition is satisfied, the switch of CB3 is closed. It can only be switched from CB1 to CB 3. The switching conditions include: fast switching, phase angle switching ahead, time switching ahead, residual voltage switching, and long delay switching. When the fast switching is unsuccessful, the switching is automatically switched to the over-the-front phase angle switching, the over-the-front time switching, the residual voltage switching and the long delay switching.
The invention comprises low-pressure load shedding control, wherein the control is provided with two sections of low-pressure load shedding outlets, namely a load shedding I and a load shedding II, the action processes of the two sections of outlets are the same, and the low-pressure load shedding section is taken as an example: in the switching process, when the bus voltage is continuously lower than a fixed value of 'low-voltage load shedding first-section amplitude', and the set delay of the fixed value 'low-voltage load shedding first-section delay' is met, the auxiliary machine is cut off at a low-voltage load shedding first-section outlet to facilitate the self-starting of the important auxiliary machine. The exit junction is a closed pulse signal of 1 s.
The two sections of delay fixed values and the voltage amplitude value can be respectively set, and the closing of the target branch switch is used as the delay starting time. The function is automatically switched in only when the device is switched and the target branch switch is closed, and automatically switched out after being switched in for 1 s.
The invention includes post-acceleration protection control, in order to prevent the fault bus from being thrown by mistake during switching, the device outputs two pairs of pulse signal contacts, and the two pairs of pulse signal contacts are matched with post-branch acceleration protection to quickly remove the fault. The contact is a 1s closed pulse signal.
For the occasion of non-branch protection, the system provides a post-acceleration protection function. And after the target branch switch is closed, monitoring the target branch current in post-acceleration effective time (the fixed opening is 6S after the switch is closed), and if any phase current exceeds a post-acceleration current amplitude fixed value, jumping the target branch switch after meeting the post-acceleration delay fixed value.
The invention comprises overcurrent lockout control, and under the condition of fault override trip, if a corresponding hard-wired lockout signal is lacked, the fast switching device can switch by mistake, and the standby power supply is switched to a fault bus by mistake, so that the fault range is expanded. In order to prevent the situation from happening, the device provides an overcurrent lockout switching function, automatic lockout switching can be realized when the fault is tripped out in an override mode, and the device automatically relieves lockout switching according to the system running state after the fault is relieved and then is put into operation again.
When the time that the current of the line 1 is continuously larger than the 'branch 1 overcurrent locking amplitude' exceeds the 'branch 1 overcurrent locking delay' fixed value, locking is switched. The direction of the overcurrent locking function can be selected by the constant value of the overcurrent locking direction. The sensitive angle of the direction element is 225 degrees, and a 90-degree wiring mode is adopted. The direction element and the current element are connected in a phase-start manner. The direction element has a memory function, and can eliminate the dead zone of the direction element when the three phases are short-circuited.
The invention comprises bus switch jump control, when the residual voltage switching and long time delay switching have larger impact on the capacitor or small power supply due to larger pressure difference, the bus jump function is set, and whether the corresponding bus switch is in jump can be set through control words [ jump bus 1 switch ] and [ jump bus 2 switch ]. When the residual voltage switching or long-delay switching is met, the device firstly performs the joint tripping on the corresponding bus switch and judges that the corresponding switch bus switch is tripped, and then the subsequent switching operation is performed. And in the time of a fixed value [ maximum widening time of the switching-on/off pulse ], if the response gang jumping switch does not jump, the switching fails, and the switching process is terminated.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and all equivalent changes and modifications made by the claims of the present invention should be covered by the scope of the present invention.
Claims (3)
1. A system for fast switching of power supplies, comprising: the system comprises a CPU, a DSP, an A/D converter, a mutual inductor, an optical coupling isolator, an outlet relay, a QDJ, a power supply module and a human-computer interaction module;
the CPU and the DSP belong to a control module, the CPU is connected with a human-computer interaction module, a communication module and a printer and realizes a wave recording function, and the DSP is connected with the A/D converter and the optocoupler isolator and receives digital signals output by the A/D converter and the optocoupler isolator and outputs and controls actions of an outlet relay and a QDJ; the mutual inductor outputs an analog signal to the A/D converter to realize the analog quantity data acquisition function; the optical coupler isolator safely isolates the DSP from the outside; the external input comprises 9 paths of signals, and the input of the external input is connected with the optical coupling isolator; the power supply module is a 110V/220V direct current power supply, comprises two pairs of alarm and locking contacts and is connected with each module of the system; the human-computer interaction module comprises a liquid crystal display module, a keyboard, an indicator light and an ARM processor, and the keyboard is connected with the CPU for data information interaction; the outlet relay is used for carrying out quick automatic switching and is connected with the DSP to control output action; the QDJ is connected with an inlet wire power supply and an outlet relay; + E is an incoming line power supply, and the system controls the quick and safe cutting off of the incoming line power supply; the printing serial port is used for connecting the printer and the CPU;
the working modes of the control module comprise a normal manual switching mode, an accident switching mode and an abnormal switching mode; the switching modes comprise parallel automatic switching, parallel semi-automatic switching, series switching and simultaneous switching;
the parallel connection automatic switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) when the parallel switching condition is met, the CB3 switch is closed,
(3) when the time delay meets the fixed value of 'parallel trip time delay', and the success of switching on the CB3 switch is confirmed, the CB1 switch is automatically tripped;
the parallel semi-automatic switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) when the parallel switching condition is met, the operation of closing the CB3 switch and tripping the CB1 switch is manually completed,
(3) if the CB1 switch is not tripped in 25s, the device alarms and locks the switch;
the series switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) a CB1 switch jumping command is sent out, when the CB1 switch jumps and the switching condition is met, the CB3 switch is closed,
the switching conditions include: fast switching, phase angle switching ahead, time switching ahead, residual voltage switching, long delay switching,
when the fast switching is unsuccessful, the switching is automatically switched to the over-front phase angle switching, the over-front time switching, the residual voltage switching and the long delay switching,
when the switching is started, the fast switching is started when the frequency difference between the voltage of the bus 1 and the target branch voltage is less than the fixed value of the fast switching frequency difference and the phase difference is less than the fixed value of the fast switching phase difference,
when the phase difference between the bus 1 voltage and the target branch voltage is equal to the fixed value of the same-capture leading phase angle and the frequency difference between the bus 1 voltage and the target branch voltage is less than the fixed value of the same-capture allowable frequency difference, the switching of the leading phase angle is started,
when the phase difference between the voltage of the bus 1 and the target branch voltage is zero and the frequency difference between the voltage of the bus 1 and the target branch voltage is smaller than the fixed value of the same-catching allowable frequency difference after the time delay set by the fixed value of the 'time before catching switch', starting the time switching before catching,
when the voltage amplitude of the bus 1 is lower than a fixed value of 'residual voltage switching amplitude', residual voltage switching is started, and when the four switching conditions of the quick switching, the phase angle switching before the bus is switched, the time switching before the bus is switched and the residual voltage switching are not met in the time delay set by the fixed value of 'long delay time', the long delay switching is started;
the simultaneous switching comprises the following steps:
(1) the switching is started manually and the switching is started manually,
(2) a CB1 switching-off command is sent out, and after a constant value of 'simultaneous switching-on delay', no matter whether the CB1 switch is switched off or not, a CB3 switching-on command is sent when the switching condition is met;
when the working mode of the control module is a normal manual switching mode, the working mode judges that the starting mode is started locally through a device menu or remotely through a control console/DCS; when the working mode of the control module is an accident switching mode, the working mode judges that the starting mode is started through the protection contact; when the working mode of the control module is an abnormal switching mode, the working mode judges that the starting mode comprises bus voltage loss automatic starting, line no-current automatic starting and switch skip starting;
when the working mode of the control module is a normal manual switching mode, switching judgment conditions can be divided into two types, wherein the first type is parallel switching, and the second type is quick switching, leading phase angle switching, leading time switching, residual voltage switching and long delay switching; the switching modes of the first switching judgment condition are parallel automatic switching and parallel semi-automatic switching, and the switching modes of the second switching judgment condition are series switching and simultaneous switching;
when the working mode of the control module is an abnormal switching mode, the switching judgment conditions are quick switching, forward phase angle switching, forward time switching, residual voltage switching and long delay switching; when the starting mode is judged to be bus voltage loss automatic starting in the working mode, the switching mode is series switching and simultaneous switching; when the working mode judges that the starting mode is line non-flow automatic starting, the switching mode is series switching and simultaneous switching; when the starting mode is judged to be switch jump starting in the working mode, the switching mode is series switching;
the bus voltage is continuously lower than a constant value of 'no-voltage starting amplitude' and the time of no current of incoming line exceeds the constant value of 'no-voltage starting delay', and the device automatically starts and switches;
the starting conditions were as follows:
when the switching total input is not less than the input, the voltage loss switching mode is not less than the input, the three-phase voltage of the bus 1 is continuously lower than the constant value of the voltage loss starting amplitude, and the branch 1 has no current, the abnormal switching mode-the switching mode of the bus voltage loss automatic starting is the series switching mode;
when the switching total input is not less than the input, the voltage loss switching mode is not less than the constant voltage starting amplitude, and the branch 1 has no current, the abnormal switching mode-the switching mode of the automatic starting of the voltage loss of the bus is the simultaneous switching mode;
the control module also comprises low-voltage load shedding control, post acceleration protection control, overcurrent locking control and bus switch joint tripping control;
the bus switch joint tripping control is characterized in that when the residual voltage switching and the long-delay switching have large impact on a capacitor or a small power supply due to large differential pressure, a bus joint tripping function is set, and whether a corresponding bus switch is in joint tripping or not can be set through control words of a joint tripping bus 1 switch and a joint tripping bus 2 switch; when the residual voltage switching or long-delay switching is met, the device firstly carries out the joint tripping of the corresponding bus switch and judges that the corresponding bus switch is tripped, and then the subsequent switching operation is carried out; if the response gang jumping switch is not tripped in the time of the maximum widening time of the switching-on and switching-off pulse of a fixed value, the switching is failed, and the switching process is terminated;
the position relations of the CB1 switch, the CB3 switch, the bus 1, the branch 1, the line 1 and the line 2 are as follows:
branch 1 is connected with bus 1 through a CB1 switch, branch 2 is connected with bus 2 through a CB2 switch, and bus 1 is connected with bus 2 through a CB3 switch.
2. The power supply fast switching system according to claim 1, wherein the operation mode of the control module is an accident switching mode, the switching determination conditions are fast switching, phase-crossing angle switching, time-crossing switching, residual voltage switching and long-delay switching, and the switching modes are series switching and simultaneous switching.
3. The system for rapidly switching power supplies according to claim 1, further comprising a communication module, wherein the communication module is for RS485 serial port communication, and the communication interface supports IEC60870-5-103 and Modbus communication protocols.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711030092.8A CN107947340B (en) | 2017-10-30 | 2017-10-30 | Power supply fast switching system and switching method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711030092.8A CN107947340B (en) | 2017-10-30 | 2017-10-30 | Power supply fast switching system and switching method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107947340A CN107947340A (en) | 2018-04-20 |
| CN107947340B true CN107947340B (en) | 2022-05-10 |
Family
ID=61936600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711030092.8A Active CN107947340B (en) | 2017-10-30 | 2017-10-30 | Power supply fast switching system and switching method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107947340B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034604A (en) * | 2019-04-18 | 2019-07-19 | 徐州矿达机电科技有限公司 | A kind of dual power supply fast switching system |
| CN110504683A (en) * | 2019-08-20 | 2019-11-26 | 国家能源集团宁夏煤业有限责任公司 | The control method and control system of grid switching operation |
| CN111711261A (en) * | 2020-07-02 | 2020-09-25 | 陕西榆林能源集团横山煤电有限公司 | Method for manually switching factory power supply to different network power supply and automatically judging |
| CN112039205B (en) * | 2020-08-28 | 2024-02-27 | 国网河南省电力公司技能培训中心 | Remote on-site switch with remote authorization control function and mode control method |
| CN113872315A (en) * | 2021-09-28 | 2021-12-31 | 北京正大蛋业有限公司 | Chicken coop fan power supply standby system raises in cages |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465560A (en) * | 2008-12-29 | 2009-06-24 | 南京南瑞继保电气有限公司 | Method for rapidly switching power supply |
-
2017
- 2017-10-30 CN CN201711030092.8A patent/CN107947340B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465560A (en) * | 2008-12-29 | 2009-06-24 | 南京南瑞继保电气有限公司 | Method for rapidly switching power supply |
Non-Patent Citations (2)
| Title |
|---|
| PCS-9655S电源快速切换装置技术和使用说明书;sjyjylch;《百度文库》;20111123;正文第1-6节 * |
| sjyjylch.PCS-9655S电源快速切换装置技术和使用说明书.《百度文库》.2011, * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107947340A (en) | 2018-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107947340B (en) | Power supply fast switching system and switching method thereof | |
| CN109782657B (en) | Circuit breaker divide-shut brake integrated control system | |
| CN109193582A (en) | A kind of intelligent distribution network locality protection control system and control method | |
| CN101728865B (en) | Undisturbed stable switching method for industrial enterprise factory electrical system | |
| CN107069676A (en) | Power distribution network fault positioning and rapid isolation recovery control method | |
| CN108565974B (en) | Self-powered remote failure protection method and system based on protection device | |
| CN108539718B (en) | Rapid and remote backup protection device and protection method for transformer substation | |
| CN110460025B (en) | Quick ring-opening method and device | |
| CN109245101B (en) | Method for improving power supply reliability of series-supply transformer substation | |
| CN110165697A (en) | Multiterminal flexible direct current distribution system start & shutdown through one key method and device | |
| CN112491040A (en) | Automatic switching device for standby power supply line of superconducting cable and operation method thereof | |
| CN110912253B (en) | Low-voltage intelligent spare power automatic switching system | |
| CN105633917A (en) | Unified power flow controller-based fault processing method and system | |
| CN114977171A (en) | Power distribution network load transfer method and device | |
| CN112332521B (en) | Sectional spare power automatic switching circuit configured by bus main transformer low-voltage double branches and control method thereof | |
| CN111641193B (en) | Self-adaptive double-bus failure protection method and device | |
| CN107910855A (en) | A kind of connection applied to intelligent substation cuts small power supply device and connection blanking method | |
| CN103972865A (en) | Control method for preventing motor from being switched into short-circuit fault | |
| CN213754084U (en) | Dual-power supply system adopting power supplies with different grounding modes | |
| CN110137899B (en) | Method and device for controlling switching-on failure of induced current quick release device | |
| CN112967904A (en) | Wiring structure of gas relay for converter transformer and signal output method | |
| JP2826610B2 (en) | Distribution line switching method and apparatus | |
| CN211880167U (en) | Spare power automatic switching system applied to high-speed electrified railway | |
| CN114614451B (en) | Remote backup protection method, protection device and hierarchical relay protection system for station domain layer | |
| CN215071660U (en) | Multi-channel power supply system of combined cycle unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |