CN106374613A - Switching method and device of desulfurization power supply in power plant - Google Patents
Switching method and device of desulfurization power supply in power plant Download PDFInfo
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- CN106374613A CN106374613A CN201610808314.3A CN201610808314A CN106374613A CN 106374613 A CN106374613 A CN 106374613A CN 201610808314 A CN201610808314 A CN 201610808314A CN 106374613 A CN106374613 A CN 106374613A
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- power supply
- stand
- switching
- power
- working power
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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
- H02J9/061—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 for DC powered loads
-
- 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
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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 relates to the field of power supply switching and discloses a switching method and device of a desulfurization power supply in a power plant. The method comprises the steps of receiving a switching control instruction; when the switching control instruction indicates normal switching, judging whether a first switching condition is met or not according to received bus detection information, working power supply detection information and emergency power supply detection information; when the first switching condition is met, switching the desulfurization power supply into a mode that a working power supply and an emergency power supply are connected in parallel for connection; and turning off one of the working power supply and the emergency power supply after a preset time delay to finish switching of the desulfurization power supply from the working power supply to the emergency power supply or from the emergency power supply to the working power supply. By the switching method and device, the desulfurization power supply can be automatically switched and continuous operation of a desulfurization system is ensured.
Description
Technical field
The present invention relates to power supply switching field, in particular it relates in power plant desulfurization power supply switching method and apparatus.
Background technology
In prior art, in power plant, desulfurization power supply includes working power and stand-by power supply.Desulphurization system is run normal
When, using working power, that is, to inductive switch closure, stand-by power supply correspondence switches off working power.Stop fortune in desulphurization system
When row, power supply used by power plant switch over, desulfurization power supply can be switched to by stand-by power supply using manually mode.Existing
Have in technology using manual switching mode so that in handoff procedure desulfurization power supply there is the relatively long dead electricity time it is impossible to
Meet the requirement to the continuous service done by desulphurization system in environmental requirement.
Content of the invention
It is an object of the invention to provide in a kind of power plant desulfurization power supply switching method and apparatus, to solve above-mentioned technology
Problem, solves above-mentioned technical problem at least in part.
To achieve these goals, the present invention provides a kind of changing method of desulfurization power supply in power plant, and the method includes:
Receive switching control instruction；When switching control instruction instruction is normally switched, according to the bus detection information receiving, work
Power detecting information and stand-by power supply detection information judge whether to meet the first switching condition；When meeting the first switching condition,
Desulfurization power supply is switched to working power and stand-by power supply access in parallel, after default time delay, by working power and standby electricity
One of source disconnects, to complete desulfurization power supply cutting from working power to stand-by power supply or from stand-by power supply to working power
Change.
Preferably, described first switching condition includes between bus and stand-by power supply voltage difference and is less than predeterminated voltage difference and work
Make difference on the frequency between power supply and stand-by power supply and be less than predeterminated frequency difference value.
Preferably, described disconnect one of working power and stand-by power supply includes judging working power and stand-by power supply
Whether all remain closure state in default time delay；When working power and stand-by power supply all remain closure in default time delay
During state, one of working power and stand-by power supply are disconnected.
Preferably, methods described also includes normally being switched and discontented through judging determination when switching control instruction instruction
During foot the first switching condition, carry out lock operation.
Preferably, methods described also includes when switching control instruction instruction carries out abnormal switching, according to the bus receiving
Detection information, and working power detection information or stand-by power supply detection information judge whether to meet the second switching condition, when full
Foot the second switching condition when, by desulfurization power supply from working power be switched to stand-by power supply or from stand-by power supply be switched to work electricity
Source.
Preferably, described second switching condition includes the stand-by power supply changed to be cut or working power is normal condition and mother
Line voltage is less than preset voltage value.
Disclose a kind of switching device of desulfurization power supply in power plant according to a further aspect in the invention, this device includes:
Receiver module, for receiving switching control instruction；Judge module, for when switching control instruction instruction normally switched when,
Judge whether to meet the first switching according to the bus detection information receiving, working power detection information and stand-by power supply detection information
Condition；Handover module, for when meeting the first switching condition, desulfurization power supply being switched to working power and stand-by power supply in parallel
Access, after default time delay, one of working power and stand-by power supply are disconnected, to complete desulfurization power supply from working power
Switching to stand-by power supply or from stand-by power supply to working power.
Preferably, described first switching condition includes between bus and stand-by power supply voltage difference and is less than predeterminated voltage difference and work
Make difference on the frequency between power supply and stand-by power supply and be less than predeterminated frequency difference value.
Preferably, described handover module is used for judging whether working power and stand-by power supply all remain in default time delay
Closure state；When working power and stand-by power supply all remain closure state in default time delay, by working power and standby
One of power supply disconnects.
Preferably, described device also includes lock modules, for normally being switched and warp when switching control instruction instruction
When crossing judgement determination and being unsatisfactory for the first switching condition, carry out lock operation.
Preferably, described handover module is additionally operable to when switching control instruction instruction carries out abnormal switching, according to receive
Bus detection information, and working power detection information or stand-by power supply detection information judge whether to meet the second switching condition,
When meeting the second switching condition, desulfurization power supply is switched to stand-by power supply from working power or is switched to work from stand-by power supply
Power supply.
Preferably, described second switching condition includes the stand-by power supply changed to be cut or working power is normal condition and mother
Line voltage is less than preset voltage value.
By technique scheme, receive switching control instruction；When switching control instruction instruction is normally switched, root
Judge whether to meet the first switching bar according to the bus detection information receiving, working power detection information and stand-by power supply detection information
Part；When meeting the first switching condition, desulfurization power supply is switched to working power and stand-by power supply access in parallel；Prolong through default
Shi Hou, by one of working power and stand-by power supply disconnect, with complete desulfurization power supply from working power to stand-by power supply or from
Stand-by power supply is to the switching of working power.So, it is possible desulfurization power supply is automatically switched, and ensure that desulphurization system is held
Reforwarding row.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of the changing method of desulfurization power supply in power plant according to the embodiment of the present invention；
Fig. 2 is the schematic diagram of circuit in power plant according to the embodiment of the present invention；
Fig. 3 is the structure chart of the switching device of desulfurization power supply in power plant according to the embodiment of the present invention；And
Fig. 4 is the structure chart of the switching device of desulfurization power supply in power plant according to the embodiment of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.It should be appreciated that this place is retouched
The specific embodiment stated is merely to illustrate and explains the present invention, is not limited to the present invention.
Fig. 1 is the flow chart of the changing method of desulfurization power supply in power plant according to the embodiment of the present invention, the method
Can be used in switching device, this switching device can not have spy for a part for independent equipment or control device, here of the present invention
Do not limit.As shown in figure 1, the method comprises the steps.
In step s110, receive switching control instruction.
Switching device can be connected with control device (for example, dcs (dcs)), receiving control apparatus transmitting
Switching control instructs.Operator also can input switching control instruction so that switching device by the control panel of switching device
Receive switching control instruction.
In step s120, when switching control instruction instruction normally switched when, according to receive bus detection information,
Working power detection information and stand-by power supply detection information judge whether to meet the first switching condition.
For example, switching device is connected with the voltage transformer (pt) of working power, stand-by power supply and bus bar side, receives
Working power detection information, stand-by power supply detection information and bus detection information that pt detects respectively.When switching control instruction
When instruction is normally switched, the detection information according to receiving judges whether to meet first condition.
In one embodiment, the first switching condition may include voltage difference between bus and stand-by power supply and is less than predeterminated voltage difference
And difference on the frequency is less than predeterminated frequency difference value between working power and stand-by power supply.For example, detection information includes magnitude of voltage and frequency
Value, when between busbar voltage and backup power source voltage, difference is less than predeterminated voltage difference and working power frequency and stand-by power supply frequency
Between difference be less than predeterminated frequency difference value when it may be determined that meeting first condition.Wherein, predeterminated voltage difference can be in 3v-5v
Arbitrary value, predeterminated frequency difference value can be the arbitrary value in 0.5hz nearby given range.
In step s130, when meeting the first switching condition, desulfurization power supply is switched to working power and stand-by power supply
Access in parallel, after default time delay, one of working power and stand-by power supply is disconnected, to complete desulfurization power supply from work
The switching to stand-by power supply or from stand-by power supply to working power for the power supply.
In one embodiment, described desulfurization power supply is switched in parallel access of working power and stand-by power supply to may include basis
The switching-state information receiving, judges the state to inductive switch and stand-by power supply to inductive switch for the working power, and state is to disconnect
Working power inductive switch or stand-by power supply are closed to inductive switch.For example, switching device receives circuit breaker position information,
Determine the state of various location switch, when meeting first condition and carrying out in parallel access, by working power and stand-by power supply pair
It is the switch closure of off-state in inductive switch.
In one embodiment, described by one of working power and stand-by power supply disconnect may include judge working power with
Whether stand-by power supply all remains closure state in default time delay；When working power and stand-by power supply are all protected in default time delay
When holding as closure state, one of working power and stand-by power supply are disconnected.
Methods described may also include and normally switched and through judging that determination is unsatisfactory for the when switching control instruction instruction
During one switching condition, carry out lock operation.
For example, when meeting first condition, the switching of automated manner in parallel can be carried out it is also possible to carry out in parallel half
The switching of automated manner.And, the switching carrying out can be two-way switching, you can be switched to stand-by power supply from working power,
Working power can be switched to from stand-by power supply.
In automated manner in parallel, when working power is switched to stand-by power supply, the stand-by power supply that will be switched off state corresponds to
Switch closure, after one section of time delay, if interior stand-by power supply does not have tripping to inductive switch during time delay, by working power
Correspondence switches off；If interior stand-by power supply is to inductive switch tripping during time delay, working power is no longer broken to inductive switch
Open.Similar method can also be used to carry out the switching from stand-by power supply to working power, will not be described here.
In semiautomatic fashion in parallel, when working power is switched to stand-by power supply, closure stand-by power supply, to inductive switch, is grasped
Make personnel and disconnect working power by hand to inductive switch, if in preset duration, working power disconnects not yet to inductive switch, then enter
Row is reported to the police.Similar method can also be used to carry out the switching from stand-by power supply to working power, will not be described here.
If additionally, being unsatisfactory for first condition, switching device can carry out locking, can also send prompting to control device
Information.After switching device locking, enter and wait involution state.
Using technique scheme, desulfurization power supply can be automatically switched, and ensure that desulphurization system is persistently transported
OK.
In another embodiment, in the present invention method may also include when switching control instruction instruction carry out abnormal switching
When, according to the bus detection information receiving, and working power detection information or stand-by power supply detection information judge whether to meet
Second switching condition, when meeting the second switching condition, desulfurization power supply is switched to stand-by power supply or from standby from working power
Power supply is switched to working power.
For example, switching device is connected with the voltage transformer (pt) of working power, stand-by power supply and bus bar side, receives
Working power detection information, stand-by power supply detection information and bus detection information that pt detects.When switching control instructs instruction
When carrying out abnormal switching, the detection information according to receiving judges whether to meet second condition.
In one embodiment, described second switching condition includes the stand-by power supply changed to be cut or working power is normal shape
State and busbar voltage are less than preset voltage value.For example, when the stand-by power supply changed to be cut is normal condition and busbar voltage is less than
It may be determined that meeting second condition during preset voltage value, and desulfurization power supply is switched to stand-by power supply from working power.When to be cut
The working power changed to is normal condition and busbar voltage is less than during preset voltage value it may be determined that meeting second condition, and will
Desulfurization power supply is switched to working power from stand-by power supply.
For example, in abnormal cases, the switching control instruction instruction that control device sends carries out abnormal switching, abnormal
Switching can be two-way switching, you can be switched to stand-by power supply it is also possible to be switched to work electricity from stand-by power supply from working power
Source.Abnormal switching can be initiated by protection exit, it may include series connection switches and switches simultaneously.
Wherein, abnormal conditions may include: electric auxiliary bus bar dead electricity, common section bus dead electricity, working power switch mis-jumping and
Higher level's switch or service entrance switch false tripping.When electric auxiliary bus bar three-phase voltage is below setting valve, exceed whole less than the setting valve time
Determine during time delay it may be determined that being electric auxiliary bus bar dead electricity, now, may be selected carries out connecting switching still switches simultaneously.As public mother
Line three-phase voltage is below setting valve, exceedes time delay of adjusting less than the setting valve time it may be determined that being public bus dead electricity, now,
May be selected carries out connecting switching still switches simultaneously.Because a variety of causes (for example artificial maloperation) is likely to result in working power
Switch mis-jumping is opened, and now, when meeting second condition, can close stand-by power supply to inductive switch, be switched to stand-by power supply.Because each
Kind reason (for example, artificial maloperation) is likely to result in higher level's electric power incoming line switch mis-jumping and opens, and now, is meeting second condition
When, stand-by power supply can be closed to inductive switch, be switched to stand-by power supply.
When carrying out series connection switching, will working power used or stand-by power supply correspondence switch off, before the determination before
Working power used or stand-by power supply are already off to inductive switch and meet after second condition, close the stand-by power supply changed to be cut
Or working power is to inductive switch.For example, when being switched to stand-by power supply from working power, first jump working power to inductive switch,
Confirm working power to inductive switch tripping and when second condition meets, closure stand-by power supply is to inductive switch.From stand-by power supply
When being switched to working power, first jump stand-by power supply to inductive switch, confirm stand-by power supply to inductive switch tripping and second condition
When meeting, Operating In Persistent Current Mode power supply is to inductive switch.
When being switched simultaneously, working power used or stand-by power supply correspondence will switch off before, meet determining
After second condition, immediately or after Preset Time, close the stand-by power supply changed to be cut or working power to inductive switch.Example
As, when being switched to stand-by power supply from working power, first tripping working power to inductive switch, when determining that second condition meets,
Closure stand-by power supply is to inductive switch.When being switched to working power from stand-by power supply, first tripping stand-by power supply to inductive switch, true
When determining second condition and meeting, Operating In Persistent Current Mode power supply is to inductive switch.
Below, illustrative to the present invention taking circuit in power plant shown in Fig. 2 as a example.As shown in Fig. 2 generating electricity
In factory, #1 unit 6kv desulfurization power supply is i section 1bbc section, and #2 unit 6kv desulfurization power supply is ii section 2bbc section.1bbc section, 2bbc section
It is respectively provided with electric power incoming line, stand-by power supply inlet wire, 1bbc section working power inlet wire is that 1bbc01 (1bc03) switchs, stand-by power supply
Inlet wire is that 1bbc02 (2ba19) switchs, and contact capacity is 1250a.2bbc section working power inlet wire is 2bbc01 (2bc03), standby
It is 2bbc02 (1ba09 switch) with electric power incoming line, 6kv switchs as abb vacuum circuit breaker, contact capacity is 1250a.Take off in 6kv
Sulfur i section increases switching device, realizes 1bbc01 switch and 1bbc02 switch switching.Increase switching device in 6kv desulfurization ii section, real
Existing 2bbc01 switch and 2bbc02 switch switching.Increase 1bbc01 and 1bbc02 mains side in 6kv desulfurization i section controller switching equipment end
Pt cabinet, work inlet wire pt voltage 1bbc01, standby inlet wire pt voltage 1bbc02, bus pt voltage 1bbc06 are respectively connected to switch
Device.Increase one side 2bbc01 and 2bbc02 mains side pt cabinet in 6kv desulfurization ii section controller switching equipment end, by work inlet wire pt electricity
Pressure 2bbc01, standby inlet wire pt voltage 2bbc02, bus pt voltage 2bbc06 are respectively connected to fast switching device.Higher level switch 1bc01,
2ba19 and 2bc03,1ba09 are still maintained at dcs control, and keep closing position.Switching device automatic switchover action is in a 6kv
Working power switch and a 6kv Backup Power Switch.Normally switch to two-way switching, abnormal switching is also two-way: #1 unit
The service entrance switch 1bbc01 that falls or work falls, and power supply automatically switches from standby inlet switch 1bbc02, and #2 unit falls or work inlet wire
Switch 2bbc01 falls, and power supply automatically switches from standby inlet switch 2bbc02.Switching device connects dcs and controls cable and signal electricity
Cable, places switching device and controls and circuit breaker position signal cable to 6kv inlet wire, standby incoming line cabinet.Switching device executes this
Bright middle method.Wherein, #1 unit 6kv desulfurization power supply is identical with the changing method of #2 unit 6kv desulfurization power supply, below with #1 unit
Illustrate as a example the switching of 6kv desulfurization power supply.
Realize for desulfurization 1bbc section working power switching to stand-by power supply before shutdown, switching device receives instruction and carries out
The switching control instruction of normal switching, judges to meet the first switching condition according to the pt detection information receiving, stand-by power supply is left
Close 1bbc02 closure so that stand-by power supply and working power parallel connection access；After default time delay, working power is switched
1bbc01 disconnects, to complete switching from working power to stand-by power supply for the desulfurization power supply.
When 1bbc section busbar voltage is less than 80%, switching device receives and indicates that carrying out the abnormal switching control switching refers to
Order, judges to meet the second switching condition according to the pt information receiving, and working power switch 1bbc01 is disconnected, stand-by power supply is left
Close 1bbc02 to close so that desulfurization power supply is switched to stand-by power supply from working power, and then ensure that desulphurization system is normally run.
After 1bbc01 or 1bbc03 fault trip, switching device receives and indicates that carrying out the abnormal switching control switching refers to
Order, judges to meet the second switching condition according to the pt information receiving, and working power switch 1bbc01 is disconnected, stand-by power supply is left
Close 1bbc02 to close so that desulfurization power supply is switched to stand-by power supply from working power, and then ensure that desulphurization system is normally run.
In unit starting, desulfurization power supply is closed by Backup Power Switch 1bbc02 and runs, after unit starting is grid-connected, work
The high rheology of power supply #1 is powered, and switching device receives the switching control instruction that instruction is normally switched, according to receive
Pt detection information judges satisfaction the first switching condition, by working power switch 1bbc01 closure so that stand-by power supply and work are electric
Source is in parallel to be accessed；After default time delay, Backup Power Switch 1bbc02 is disconnected, with complete desulfurization power supply from stand-by power supply to
The switching of working power.
In the above-mentioned methods, increase switch inlet wire, standby inlet wire pt cabinet in desulfurization 6kv system, increase switching device,
Bbc01, bbc02 switch is automatically switched, desulfurization 6kv system not dead electricity in the handover.Service power after unit starting
In switching using carrying out desulfurization power supply switching, it is to avoid the desulfurization dead electricity that manual switching causes, avoid unit outage simultaneously.?
Realize switching when switch fault or power cable short trouble, do not result in the unit outage that desulphurization system stoppage in transit causes.
As shown in figure 3, being the structure chart of the switching device of desulfurization power supply in power plant, this device may include as lower module.
Receiver module 310, for receiving switching control instruction；
Judge module 320, for when switching control instruction instruction is normally switched, according to the bus detection letter receiving
Breath, working power detection information and stand-by power supply detection information judge whether to meet the first switching condition；
Handover module 330, for when meeting the first switching condition, desulfurization power supply being switched to working power and standby electricity
Source is in parallel to be accessed, and after default time delay, one of working power and stand-by power supply is disconnected, to complete desulfurization power supply from work
Make switching to stand-by power supply or from stand-by power supply to working power for the power supply.
In one embodiment, the first switching condition include between bus and stand-by power supply voltage difference be less than predeterminated voltage difference and
Between working power and stand-by power supply, difference on the frequency is less than predeterminated frequency difference value.
In one embodiment, handover module 330 be used for judging working power and stand-by power supply in default time delay whether all
Remain closure state；When working power and stand-by power supply all remain closure state in default time delay, by working power
With one of stand-by power supply disconnection.
In one embodiment, as shown in figure 4, described device also includes lock modules 410, for referring to when switching control
Show and normally switched and when judging that determination is unsatisfactory for the first switching condition, carry out lock operation.
In one embodiment, handover module 330 is additionally operable to when switching control instruction instruction carries out abnormal switching, according to connecing
The bus detection information received, and working power detection information or stand-by power supply detection information judge whether to meet the second switching bar
Part, when meeting the second switching condition, desulfurization power supply is switched to stand-by power supply from working power or is switched to from stand-by power supply
Working power.
In one embodiment, the second switching condition include the stand-by power supply changed to be cut or working power be normal condition and
Busbar voltage is less than preset voltage value.
Described device is corresponding with said method, describes in detail, will not be described here in specific embodiment reference method.
Describe the preferred embodiment of the present invention above in association with accompanying drawing in detail, but, the present invention is not limited to above-mentioned reality
Apply the detail in mode, in the range of the technology design of the present invention, multiple letters can be carried out to technical scheme
Monotropic type, these simple variant belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy no longer separately illustrates.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as it is without prejudice to this
The thought of invention, it equally should be considered as content disclosed in this invention.
Claims (12)
1. in a kind of power plant desulfurization power supply changing method, the method includes:
Receive switching control instruction；
When switching control instruction instruction is normally switched, according to the bus detection information receiving, working power detection information
Judge whether to meet the first switching condition with stand-by power supply detection information；
When meeting the first switching condition, desulfurization power supply is switched to working power and stand-by power supply access in parallel, through default
After time delay, by one of working power and stand-by power supply disconnect, with complete desulfurization power supply from working power to stand-by power supply or
Switching from stand-by power supply to working power.
2. method according to claim 1 is it is characterised in that described first switching condition is included between bus and stand-by power supply
Voltage difference be less than predeterminated voltage difference and between working power and stand-by power supply difference on the frequency be less than predeterminated frequency difference value.
3. method according to claim 1 is it is characterised in that described disconnect one of working power and stand-by power supply
Including:
Judge whether working power and stand-by power supply all remain closure state in default time delay；
When working power and stand-by power supply all remain closure state in default time delay, by working power and stand-by power supply
One of disconnect.
4. method according to claim 1 is it is characterised in that methods described also includes:
When switching control instruction instruction is normally switched and when judging that determination is unsatisfactory for the first switching condition, carries out locking
Operation.
5. according to the arbitrary described method of Claims 1-4 it is characterised in that methods described also includes:
When switching control instruction instruction carries out abnormal switching, according to the bus detection information receiving, and working power detection
Information or stand-by power supply detection information judge whether to meet the second switching condition, when meeting the second switching condition, by desulfurization electricity
Source is switched to stand-by power supply from working power or is switched to working power from stand-by power supply.
6. method according to claim 5 is it is characterised in that described second switching condition includes the standby electricity changed to be cut
For normal condition and busbar voltage is less than preset voltage value for source or working power.
7. in a kind of power plant desulfurization power supply switching device, this device includes:
Receiver module, for receiving switching control instruction；
Judge module, for when switching control instruction instruction is normally switched, according to the bus detection information receiving, work
Power detecting information and stand-by power supply detection information judge whether to meet the first switching condition；
Handover module, for when meeting the first switching condition, desulfurization power supply being switched to working power and stand-by power supply in parallel
Access, after default time delay, one of working power and stand-by power supply are disconnected, to complete desulfurization power supply from working power
Switching to stand-by power supply or from stand-by power supply to working power.
8. device according to claim 7 is it is characterised in that described first switching condition is included between bus and stand-by power supply
Voltage difference be less than predeterminated voltage difference and between working power and stand-by power supply difference on the frequency be less than predeterminated frequency difference value.
9. device according to claim 7 is it is characterised in that described handover module is used for judging working power and standby electricity
Whether source all remains closure state in default time delay；When working power and stand-by power supply all remain in default time delay and close
During conjunction state, one of working power and stand-by power supply are disconnected.
10. device according to claim 7 is it is characterised in that described device also includes:
Lock modules, for normally being switched and through judging that determination is unsatisfactory for the first switching bar when switching control instruction instruction
During part, carry out lock operation.
11. according to the arbitrary described device of claim 7 to 10 it is characterised in that described handover module be additionally operable to when switching control
When system instruction instruction carries out abnormal switching, according to the bus detection information receiving, and working power detection information or standby electricity
Source detection information judges whether to meet the second switching condition, when meeting the second switching condition, by desulfurization power supply from working power
It is switched to stand-by power supply or be switched to working power from stand-by power supply.
12. devices according to claim 11 it is characterised in that described second switching condition include to be cut change to standby
For normal condition and busbar voltage is less than preset voltage value for power supply or working power.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610808314.3A CN106374613A (en) | 2016-09-07 | 2016-09-07 | Switching method and device of desulfurization power supply in power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610808314.3A CN106374613A (en) | 2016-09-07 | 2016-09-07 | Switching method and device of desulfurization power supply in power plant |
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| CN106374613A true CN106374613A (en) | 2017-02-01 |
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