CN105897116A - Variable frequency speed governing hot spare circuit for large-sized water pumps in nuclear plants - Google Patents
Variable frequency speed governing hot spare circuit for large-sized water pumps in nuclear plants Download PDFInfo
- Publication number
- CN105897116A CN105897116A CN201610305671.8A CN201610305671A CN105897116A CN 105897116 A CN105897116 A CN 105897116A CN 201610305671 A CN201610305671 A CN 201610305671A CN 105897116 A CN105897116 A CN 105897116A
- Authority
- CN
- China
- Prior art keywords
- converter
- catalyst
- monitor
- circuit
- igct
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/025—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being a power interruption
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
Abstract
The invention relates to a variable frequency speed governing hot spare circuit for large-sized water pumps in nuclear plants. The circuit comprises a first converter, a second converter, a third converter and a monitor, wherein one end of each of the three converters is connected with the monitor; the first converter is connected with a first monitor in the monitor, the third converter is connected with a second monitor in the monitor, and the second converter is connected with a third monitor in the monitor; the other end of the first converter is sequentially connected with one end of each of a first contactor, a first thyristor and a second contactor connected in series; the other end of the second converter is sequentially connected with one end of each of a third contactor, a second thyristor and a fourth contactor connected in series; the other end of the third converter is sequentially connected with one end of each of a fifth contactor, a third thyristor and a sixth contactor connected in series; and a selector and controller controls all mechanical and electronic power switches. By adopting the circuit, the flow of the water pumps after variable frequency speed governing is not abruptly changed, and the impact damage on water supply pipelines is little.
Description
Technical field
The invention belongs to nuclear power plant design technology, relate generally to large pump supporting frequency control standby electricity
Road method for designing.
Background technology
Many large pumps are had for various uses in nuclear power plant.In these occasions, water pump is normal
Run without interruption and be related to the safety problem of nuclear power station, so the reliability requirement of power supply unit is high.
But winter, temperature difference of seawater in summer in certain areas are relatively big, cause the current required for Various Seasonal
Amount also has bigger difference, and the regulation of some flow must use frequency control to reach, and this just requires
Frequency variant speed regulating circuit is extremely reliable.The present invention illustrates that as a example by water circulating pump frequency variant speed regulating circuit design is standby
The method for designing of active-standby switch is completed with loop.
Owing to water circulating pump importance in steam turbine runs is the highest, its power supply degree of reliability directly affects whole
Running and the ability of generating electricity by way of merging two or more grid systems (i.e. economic benefit) of whole nuclear power station, so being of individual nuclear power generating sets
Ensure that the high reliability in circulation-water pump electric machine frequency converter timing loop needs to design converter standby time
Road, it is ensured that stand-by power supply loop power supply can be switched to during normal power supply loop fault.But active and standby voltage
Type variable-frequency power sources switching in source there are several technological difficulties:
1, chopper in existing electrical main connecting wire loop, catalyst cut-off movement time more a length of tens to
Hundreds of millisecond, is unsatisfactory for the permission break period requirement of pump working.
2, converter present market mainstream equipment is voltage-source type converter, it is impossible to carry out parallel operation.
3, the pump capacity change after frequency control should not be undergone mutation, and otherwise will produce water supply line
Impact of water hammer destroying infection is the biggest.
Three above difficult point uses converter conventional circuit power supply plan to be difficult to solve, so needing from master
The structure in loop is sought change in the hope of solution.
The solution of technical scheme considers three problems.
Part I be switching switch speed issue: in the evolution of power electronic devices just because of
The speed of mechanical switch can not meet the high-speed switch requirement of circuit, the switch of semiconductor device form just occurs
Device.So controlling requirement needing the part switching switching to use semiconductor switch device to be aided with accordingly
Circuit module can meet switching requirements.
Part II is to solve the problem that voltage-source type converter is in parallel: output side transducer is in parallel, and other are any
After power supply, when converter runs, converter is not stopped completely just by another road power supply (three-phase electricity or
The output of other converters) receive the outlet side of this converter, owing to the outlet side circuit of converter is suitable
In a three-phase reversible rectifier bridge, the most just organizing bridge is that diode is uncontrollable, as long as being therefore made up of IGBT
Anti-group bridge have an IGBT conducting, may result in a power supply pipe and two through the common-anode group of IGBT
One pipe short circuit (being equivalent to positive and negative group of handoff failure in DC reversible circuit) of pole pipe common cathode group, and
The outlet side of converter typically melts the soonest, can only be burnt out by IGBT, and under PWM control mode, IGBT
Commutating pulse switch quickly, therefore, this situation once occurs, the outlet side IGBT of converter can moment
Damaging, current flow paths during outlet side power supply short circuit is as shown in Figure 1.Therefore converter and parallel connection thereof
Between power supply, partition apparatus to be added is to prevent the generation of problems.But due to the restriction of switching time, every
Disconnected device can not select the kind equipment of chopper, disconnecting switch equally, so partition apparatus can be selected for half herein
Conductor device is solved, and is aided with the control circuit control break-make meeting requirement.
Part III is the frequency conversion continued power for realizing converter, and main power source carries out no-harass switch to standby
The measure of variable-frequency power sources.Owing to motor needs to ensure rotating speed continuous running, so when primary transducer fault
Standby variable frequency device should be rapidly switched to, and should ensure that the frequency state of power supply is consistent with original power supply, this
The frequency conversion output parameter that will seek Frequency Converter Control should be input to standby variable frequency device simultaneously, in order in standby change
Frequently can power supply required for output motor in real time when device is switched to circulation-water pump electric machine current supply circuit.
Summary of the invention
For existing market main flow voltage-source type converter cannot the present situation of stand-by heat in parallel, and converter
The switching of back-up circuit is only switched into the situation of power frequency, it is an object of the invention to provide one and is capable of
The stand-by heat frequency conversion loop of inverter supply, and asking of solving that two voltage-source type converters in parallel occur
Topic, to realize reliability requirement that System in Large Circulating Water Pump powers and real-time regulating pondage in use
Requirement.In the present invention, middle pressure main circuit replaces the independent power electrical switch of conventional mechanical switch, electricity
Pressure source type frequency converter uses power electronic devices to realize the stand-by heat between current supply circuit as isolator.
Technical scheme is as follows:
A kind of nuclear power station large pump frequency control stand-by heat circuit, described circuit includes: the first converter,
Second converter, the 3rd converter, monitor, above three converter all has one end to connect described monitoring
Device；
Wherein, the first converter connects the first monitoring in monitor, and the 3rd converter connects in monitor
The second monitoring, the second converter connects the selection in monitor and controller；Another of first converter
Hold the first catalyst, the first IGCT and one end of the second catalyst of the series connection that is linked in sequence, the second frequency conversion
The other end of device be linked in sequence series connection the 3rd catalyst, the second IGCT and one end of the 4th catalyst,
The other end of the 3rd converter be linked in sequence series connection the 5th catalyst, the 3rd IGCT and the 6th catalyst
One end；The 4th crystalline substance of series connection is connected between the other end and the other end of the 4th catalyst of the second catalyst
Brake tube and the 7th catalyst；String is connected between the other end and the other end of the 6th catalyst of the 4th catalyst
8th catalyst of connection and the 5th IGCT.Voltage-source type converter uses power electronic devices as isolation
Device realizes the stand-by heat between current supply circuit.
Further, nuclear power station large pump frequency control stand-by heat circuit as above, the second contact
The other end of device and the other end of the 6th catalyst are also respectively connected with the first motor and the second motor.
Further, nuclear power station large pump frequency control stand-by heat circuit as above, described three
Described one end of individual converter is also respectively connected with power supply.Controller controls all machineries and power electronics is opened
Close.
The present invention meets the permission break period requirement of pump working, can carry out parallel operation, and frequency conversion is adjusted
Pump capacity change after speed will not be undergone mutation, and will affect the least on the impact failure of water supply line.
Accompanying drawing explanation
Fig. 1 be converter outlet side IGBT transient breakdown after outlet side power supply short circuit time current flow paths
Schematic diagram.
Fig. 2 is the frequency variant speed regulating circuit main electrical scheme and the connection diagram of thyristor switch that the present invention is concrete.
Detailed description of the invention
With embodiment, the present invention is described in detail below in conjunction with the accompanying drawings.
As in figure 2 it is shown, a kind of nuclear power station large pump frequency control stand-by circuit that the present invention provides, described
Circuit includes: first converter the 1, second converter the 2, the 3rd converter 3, monitor 4；Above three
Converter all has one end to connect described monitor, and wherein, the first converter connects the first monitoring 5 in monitor,
3rd converter connects the second monitoring 7 in monitor, and the second converter connects the selection in monitor and control
Device 6；The other end of the first converter be linked in sequence series connection first catalyst the 8, first IGCT 9 and second
One end of catalyst 10, be linked in sequence the 3rd catalyst 11, second of series connection of the other end of the second converter is brilliant
Brake tube 12 and one end of the 4th catalyst 13, the other end of the 3rd converter is linked in sequence the 5th the connecing of series connection
Tentaculum the 14, the 3rd IGCT 15 and one end of the 6th catalyst 16；The other end of the second catalyst and the 4th
The 4th IGCT 19 and the 7th catalyst 20 of series connection is connected between the other end of catalyst；4th catalyst
The 8th catalyst 21 and the 5th IGCT 22 of series connection is connected between the other end of the other end and the 6th catalyst；
The other end of the second catalyst and the other end of the 6th catalyst are also respectively connected with the first motor 17 and the second motor
18.Described one end of described three converters is also respectively connected with power supply 23.
Above-mentioned first to the 5th IGCT be switching speed be the thyristor switch device of Microsecond grade.Voltage-source type
Converter uses power electronic devices to realize the stand-by heat between current supply circuit as isolator.Controller controls institute
There are machinery and electronic power switch.
As a example by the water circulating pump of certain nuclear power engineering, the seawater flow needed for circulation winter or summer is respectively
For 14m3/ s and 19.9m3/ s, can select converter directly to regulate water after being computed the shaft power of pump and rotating speed
The rotating speed of pump motor meets steam turbine cooling requirement to obtain.In order to ensure that water circulating pump is supplied by converter in design
The high reliability of electricity, arranges a standby variable frequency device to the converter of two water circulating pumps there to be a frequency conversion
The minimizing the least during device fault impact on steam turbine cooling circuit.According to being to follow to the estimation 0.3s of pipeline
Ring water pump pipeline acceptable maximum supplies water the break period.At conventional electrical switch (chopper, catalyst)
In the case of the switching review time has been not enough to these several tasks, the crystalline substance using switching speed to be hundreds of microsecond
Thyristor device carries out the handover management of power supply.
After the electric pressure of converter and all kinds of parameters such as the electric current of power supply and protection thereof have selected, another
Outer design increases the converter 2 back-up circuit as major loop converter 1 and 3.Owing to converter is voltage
Source type frequency converter, so be considered as having when IGCT solves the switching of two converters can according to mentioned above
The problem of the intact device punctured in an other converter that can produce.In addition to the switching speed of major loop
Degree, needs again to use IGCT class power electronic devices.So in the connection major loop of converter 1, two
Individual switching device merges into one, because can carry in major loop, the power electronic devices of current/voltage must
The voltage breakdown problem intercepted between two converters can be competent at.For two converters, only design one
Individual common back-up circuit can meet the power supply reliability problem in frequency conversion loop.
Using power electronic devices to realize the break-make in loop, its main purpose is all the most micro-in order to be accurate to
The connecting and disconnecting of the circuit control accuracy of second level.While accelerating to have switched speed, how it is also contemplated that control structure
Realize the frequency conversion backup issue of converter.For realizing this purpose, need to design in converter 1 and 3 one
The monitoring system that set frequency conversion output controls, this system should be defeated without postponing to accept the control of converter 1 and 3
Go out signal and fault detection signal, and in converter 2, to use a set of and converter 2 control strategy phase
The input control module closed, and use or the manner of comparison of door controls its output frequency and selects starting impulse
Signal and exporting in real time.
Current supply circuit working condition is described as a example by converter 1 below: in major loop, catalyst all closes,
When converter 1 loop fault, then the control system of converter 1 receives the fault-signal of self, simultaneously
Pass to the monitor 4 of converter 1.This system is delivered to the fault-signal of converter 1 in converter 2,
It is transferred to the control pulse information now also having converter 1 of converter 2 simultaneously.The positive reason of converter 2
Work should be a powering up under condition, but its exit does not export electric current and is in hot stand-by duty, only receives
Converter 1 or the signal of converter 3, then according to the information of transmission, the second IGCT (SCR2) triggers defeated
Go out electric current and the frequency information that transmits according to converter 1 is finely adjusted.
And now control system sends the first IGCT (SCR1) shutoff order according to failure condition, trigger SCR2
While triggering and conducting the 4th IGCT (SCR11), and utilize the electric current of SCR2 that SCR1 is accelerated
Reversely cut-off.Now by standby variable frequency device 2, motor 1 is powered.After SCR1 cut-off, open connecing of this loop
Tentaculum, overhauls.During converter 3 fault, the switch motion of thyristor device is ibid.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
The spirit and scope of invention.So, if these amendments and modification to the present invention belong to right of the present invention
Require and within the scope of equivalent technology, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. a nuclear power station large pump frequency control stand-by heat circuit, it is characterised in that:
Described circuit includes: the first converter, the second converter, the 3rd converter, monitor, above-mentioned
Three converters all have one end to connect described monitor；
Wherein, the first converter connects the first monitoring in monitor, and the 3rd converter connects in monitor
The second monitoring, the second converter connects the selection in monitor and controller；Another of first converter
Hold the first catalyst, the first IGCT and one end of the second catalyst of the series connection that is linked in sequence, the second frequency conversion
The other end of device be linked in sequence series connection the 3rd catalyst, the second IGCT and one end of the 4th catalyst,
The other end of the 3rd converter be linked in sequence series connection the 5th catalyst, the 3rd IGCT and the 6th catalyst
One end；The 4th crystalline substance of series connection is connected between the other end and the other end of the 4th catalyst of the second catalyst
Brake tube and the 7th catalyst；String is connected between the other end and the other end of the 6th catalyst of the 4th catalyst
8th catalyst of connection and the 5th IGCT.
2. nuclear power station large pump frequency control stand-by heat circuit as claimed in claim 1, its feature
It is:
The other end of the second catalyst and the other end of the 6th catalyst are also respectively connected with the first motor and
Two motors.
3. nuclear power station large pump frequency control stand-by heat circuit as claimed in claim 1, its feature
It is:
Described one end of described three converters is also respectively connected with power supply.
4. nuclear power station large pump frequency control stand-by heat circuit as claimed in claim 1, its feature
It is:
Described first to the 5th IGCT be switching speed be the thyristor switch device of Microsecond grade.
5. nuclear power station large pump frequency control stand-by heat circuit as claimed in claim 1, its feature
It is:
Described selection and controller control all machineries and electronic power switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610305671.8A CN105897116A (en) | 2016-05-10 | 2016-05-10 | Variable frequency speed governing hot spare circuit for large-sized water pumps in nuclear plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610305671.8A CN105897116A (en) | 2016-05-10 | 2016-05-10 | Variable frequency speed governing hot spare circuit for large-sized water pumps in nuclear plants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105897116A true CN105897116A (en) | 2016-08-24 |
Family
ID=56702786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610305671.8A Pending CN105897116A (en) | 2016-05-10 | 2016-05-10 | Variable frequency speed governing hot spare circuit for large-sized water pumps in nuclear plants |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105897116A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07143794A (en) * | 1993-11-13 | 1995-06-02 | Nissan Motor Co Ltd | Fail-safe circuit for multi-rotor motor system |
| JP2006211782A (en) * | 2005-01-26 | 2006-08-10 | Yaskawa Electric Corp | Servo controller |
| CN201576957U (en) * | 2009-11-26 | 2010-09-08 | 曾仁昌 | Variable frequency power supply control system of low-voltage motor |
| CN202978789U (en) * | 2012-11-28 | 2013-06-05 | 中国石化集团四川维尼纶厂 | Frequency conversion speed regulation system wiring device |
| CN205081559U (en) * | 2015-10-21 | 2016-03-09 | 辽宁荣信电气传动技术有限责任公司 | High -voltage inverter control system hot standby topological structure |
-
2016
- 2016-05-10 CN CN201610305671.8A patent/CN105897116A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07143794A (en) * | 1993-11-13 | 1995-06-02 | Nissan Motor Co Ltd | Fail-safe circuit for multi-rotor motor system |
| JP2006211782A (en) * | 2005-01-26 | 2006-08-10 | Yaskawa Electric Corp | Servo controller |
| CN201576957U (en) * | 2009-11-26 | 2010-09-08 | 曾仁昌 | Variable frequency power supply control system of low-voltage motor |
| CN202978789U (en) * | 2012-11-28 | 2013-06-05 | 中国石化集团四川维尼纶厂 | Frequency conversion speed regulation system wiring device |
| CN205081559U (en) * | 2015-10-21 | 2016-03-09 | 辽宁荣信电气传动技术有限责任公司 | High -voltage inverter control system hot standby topological structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102810990B (en) | For dynamically changing rectification circuit and the corresponding control method of output electromotor | |
| EP2709229B1 (en) | Power distribution systems | |
| CN101087122A (en) | Refundant electrical brake and protection system for electric generators | |
| US20130002027A1 (en) | Uninterruptible power supply | |
| CN108134450A (en) | Uninterruptible power system | |
| CN102520276B (en) | Integrated testing circuit for modular multi-level converter valve and control method of integrated testing circuit | |
| WO2014017417A1 (en) | Distributed power system and operation method | |
| CN106026181A (en) | Ship shore power system | |
| CN203871871U (en) | Intelligent power station for ship | |
| CN104979852A (en) | Power distribution systems | |
| CN109066798A (en) | A kind of cutoff device of photovoltaic module | |
| CN105529734A (en) | Induction generator system with a grid-loss ride-through capability | |
| BR112013031634B1 (en) | Uninterruptible power supply system controlling a plurality of uninterruptible power supply devices | |
| CN105633994A (en) | Starting method of FMMC-LCC hybrid DC power transmission system | |
| CN104319815A (en) | Grid connection/disconnection seamless switching method for micro-grid converter | |
| CN109149626B (en) | Operation control method, device and system of generator set | |
| Naushath et al. | Energization and regulation of a hybrid HVDC grid with LCC and VSC | |
| CN201878065U (en) | SS controller for DC oil pump in generating station | |
| CN105897116A (en) | Variable frequency speed governing hot spare circuit for large-sized water pumps in nuclear plants | |
| CN111412026A (en) | Lubricating oil supply system allowing DC accident oil pump motor to be started slowly | |
| JP6062946B2 (en) | Electrical energy conversion system and method | |
| CN206397647U (en) | Oil pressure numerical value harvester and hydraulic oil jack-up pressure monitoring system | |
| CN211202070U (en) | Lubricating oil supply system allowing DC accident oil pump motor to be started slowly | |
| CN106786725B (en) | A kind of control method improving DC transmission system Inverter Station transient voltage | |
| CN206293893U (en) | The intelligent interconnection system of unit connection unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160824 |