CN107979096A - A kind of excitation control method during large-scale phase modifier startup is grid-connected - Google Patents
A kind of excitation control method during large-scale phase modifier startup is grid-connected Download PDFInfo
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- CN107979096A CN107979096A CN201711404332.6A CN201711404332A CN107979096A CN 107979096 A CN107979096 A CN 107979096A CN 201711404332 A CN201711404332 A CN 201711404332A CN 107979096 A CN107979096 A CN 107979096A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Motor And Converter Starters (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of excitation control method of large-scale phase modifier startup during grid-connected, self-shunt excitation system encourages excitation system exchange side and rectification unit mutually independently with it, in DC side parallel, shares one group of demagnetization and over-pressure safety device；The switching time of two sets of excitation systems is short, handoff procedure undisturbed, and the boosting mode of phase modulation generator terminal boosts for two-part, and without first inversion, stepping up from zero, the slave set of excitation system of exciting current quick and smooth are transferred to another set of excitation system again.The present invention is controlled by the coordination to corresponding field regulator; solve the problems, such as during large-scale phase modifier running down being switched fast for two sets of excitation systems; inhibit the disturbance in two sets of excitation system handoff procedures; realize perfect defencive function; reduce large-scale phase modifier it is grid-connected when caused by voltage difference impact, be of great significance to safe efficient, the reliability service of large-scale phase modifier.
Description
Technical field
The present invention relates to a kind of excitation control method of large-scale phase modifier startup during grid-connected, belong to electric machines control technology
Field.
Background technology
At present, dynamic passive compensation is most important for ensureing Network Voltage Stability and extra-high voltage direct-current safe operation.Adjust
Camera has that dynamic reactive enabling capabilities are strong, the advantage of stable and reliable operation, can effectively solve the problem that receiving end power grid dynamic reactive not
The problems such as foot, weak sending end grid short circuit capacity underbraced.The secondary transient characterisitics of phase modifier can effectively suppress straight-flow system hair
The probability of raw commutation failure；Transient characterisitics contribute to system voltage is rapid after catastrophe failure to recover to normal level.
According to national grid strategical planning, will Jiuquan-Hunan, Zha Lute-Qingzhou, Xi Meng-Taizhou, it is refined in-river
The sending of the more times extra-high voltage direct-currents such as west, Three Gorges-Changzhou, receiving end install phase modifier additional.In order to reduce the throwing that phase modulation unit is integrally built
Money, mitigates the maintenance workload of later stage maintenance, improves the reliability in operational process, and large-scale phase modulation unit is special with following four
Point：
1. phase modifier is dragged without prime mover, Starting mode is activation system/static frequency changer of height pattern（Hereinafter referred to as SFC）
Dragging.
2. in order to reduce cost, grid-connected switch arrangement does not set grid-connected switch in the high-pressure side of main transformer, phase modulation generator terminal, certainly
Phase modifier is determined and must configure independent it to encourage excitation system to coordinate SFC to drag.
3. to improve the reliability in operational process, shunt self excitation mode use after phase modifier is grid-connected, thus presence by
It encourages mode to the handoff procedure from shunt excitation mode.
4. synchronizing mode is grid-connected for running down, it is necessary to first disconnect SFC in short 20 second coasting time, then by shunt self excitation
System is boosted, and finally realizes grid-connected, has high requirement to the rapidity of excitation system handoff procedure.
Excitation handover scheme has exchange side switching to switch two kinds with DC side.If in exchange side switched energization, it is necessary to first exist
It encourages inversion under mode and shuts down, then excitation is boosted again in a manner of from shunt excitation, time-consuming longer, can not meet that running down is grid-connected to the time
High requirement.Therefore present invention employs the scheme of DC side switching.
To sum up, it is contemplated that the particularity of large-scale phase modifier, is suitable for large-scale phase modifier there is an urgent need to one kind and starts grid-connected mistake
Excitation control method in journey.
The content of the invention
Purpose：In order to overcome the deficiencies in the prior art, the present invention provides a kind of large-scale phase modifier and starts grid-connected mistake
Excitation control method in journey.
Technical solution：In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of excitation control method during large-scale phase modifier startup is grid-connected, includes the following steps：
Step 1：Phase modifier startup stage, starts 4-20mA or the 0-20mA electricity that excitation receives stationary frequency starting device SFC
Signal is flowed as given value of current value, and rotor current size is adjusted by current closed-loop mode, coordinates SFC dragging phase modifier turn ups
To more than 3000r/min；After rotating speed arrival, phase modifier monitoring system is sent to SFC shuts down order, and SFC, which is performed, shuts down flow, together
When SFC to start excitation send SFC exit instructions；
Step 2：After SFC is exited completely, phase modifier monitoring system sends main excitation start order, main excitation closed magnetic field breaker
QF11, detects that QF11 is in main excitation start behind conjunction position, controls the Trigger Angle of fairing, gradually increase the output of main excitation
Electric current, at this time, the output current for starting excitation are gradually reduced；Main excitation boosts to 25% phase modulation generator terminal rated voltage first, starts
Excitation detects shuts down when set end voltage is more than 20%, progressively disjunction QF01, QS02, QS01；
Step 3：Main excitation continues to boost to the mark of grid side system voltage in the case where detecting QF01 and QS02 disjunction
One value, treats that synchronous device is grid-connected.
Preferably：Start the 4-20mA or 0- that excitation receives stationary frequency starting device SFC in the step 1
20mA current signals adjust rotor current size as given value of current value by current closed-loop mode.
Preferably：Starting excitation in the step 1 coordinates SFC dragging phase modifier rotating speeds to reach 3150r/min.
Preferably：In SFC commutating circuit lockings pulse, respective switch or breaker disjunction in the step 1
In stopping process, 5% unloaded rated exciting current can be maintained by starting the given value of current value of excitation, ensure that phase modulation set end voltage is less than
The phase modulation set end voltage that SFC can bear.
A kind of excitation system during large-scale phase modifier startup is grid-connected, the excitation system include：Start excitation, master encourages
Magnetic, starts excitation and encourages excitation system for it, be derived from station-service 400V power supplys, starts excitation main circuit and is filled by starting transformer, rectification
Put, field circuit breaker QF01, electric isolating switch QS02 are sequentially connected composition；Main excitation is self-shunt excitation system, main excitation
Major loop is sequentially connected and is formed by exciting transformer, fairing, field circuit breaker QF11；Main excitation main circuit and startup excitation
Major loop is shared and is connected with the demagnetization and over-pressure safety device of phase modifier rotor-side in DC side parallel, and main excitation master time
The control on road and startup excitation main circuit is completely independent.
Preferably：Further include：AC isolation switch QS01, the AC isolation switch QS01 are arranged on station-service
Between 400V power supplys and starting transformer.
Preferably：The electric isolating switch QS02 is identical with the rated voltage of field circuit breaker QF11.
Preferably：The electric isolating switch QS02 and field circuit breaker QF01 can be replaced and field circuit breaker
The identical field circuit breaker of QF11 rated voltages.
Beneficial effect：Excitation control method during a kind of large-scale phase modifier startup provided by the invention is grid-connected, two sets
The switching time of excitation system is short, handoff procedure undisturbed, and the boosting mode of phase modulation generator terminal boosts for two-part, without first inversion
Stepping up from zero again, the slave set of excitation system of exciting current quick and smooth is transferred to another set of excitation system, when shortening switching
Between, realization is switched fast.The disturbance in two sets of excitation system handoff procedures is inhibited, realizes perfect defencive function, is reduced
Impact, have to large-scale phase modifier safe efficient, reliability service important caused by voltage difference when large-scale phase modifier is grid-connected
Meaning.
Pressure rising time is short, and main excitation system has system voltage following function, can track net side automatically in boost process
System voltage perunit value, saves the time of synchronous device adjustment pressure difference, further saves the time of grid-connected preceding switching boosting.Give
Phase modifier running down is grid-connected to provide the prerequisite optimized.
The DC side for starting excitation system can be realized and main excitation by the way of field circuit breaker and disconnecting switch series connection
System dc side voltage class is consistent, and reduces excitation system cost, is realized reduction and is built phase modulation unit cost of investment
Purpose.
Brief description of the drawings
Fig. 1 is the excitation system structure diagram of the present invention；
Fig. 2 is the control method flow chart of the present invention；
Fig. 3 is the oscillogram of two-part of the present invention boosting.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the excitation system of the present invention is made of startup excitation and main excitation, startup excitation is its excitation system
System, is derived from station-service 400V power supplys, starts excitation main circuit by AC isolation switch QS01, starting transformer, fairing, magnetic field
Circuit breaker Q F01, electric isolating switch QS02 are sequentially connected composition；Main excitation is self-shunt excitation system, main excitation main circuit by
Exciting transformer, fairing, field circuit breaker QF11 are sequentially connected composition.Main excitation main circuit and startup excitation main circuit exist
DC side parallel, shares the demagnetization and over-pressure safety device being connected with phase modifier rotor-side, and main excitation main circuit and startup
The control of excitation main circuit is completely independent.Wherein, electric isolating switch QS02 is identical with the rated voltage of field circuit breaker QF11.
As Figure 2-3, the excitation control method during a kind of large-scale phase modifier startup is grid-connected, includes the following steps：
Step 1：Phase modifier startup stage, starts excitation and receives stationary frequency starting device（SFC）4-20mA or 0-20mA
Current signal adjusts rotor current size by current closed-loop mode, coordinates SFC dragging phase modifier rotating speeds as given value of current value
Reach 3150r/min.After rotating speed arrival, phase modifier monitoring system is sent to SFC shuts down order, and SFC, which is performed, shuts down flow, at the same time
SFC sends SFC exit instructions to excitation is started.SFC is needed to operate its commutating circuit locking pulse in stopping process, accordingly opened
Close or breaker disjunction, DCS need the disconnecting switch that disjunction SFC is connected directly with phase modulation generator terminal, do not have disjunction in disconnecting switch
In the case of, if phase modulation set end voltage is more than the 20% of specified phase modulation set end voltage at this time, it is easily damaged its rectifying device.Cause
This, 5% unloaded rated exciting current can be maintained by starting the given value of current value of excitation at this time, ensure that phase modulation set end voltage is less than SFC institutes
The phase modulation set end voltage that can be born.
Step 2：After SFC is exited completely, phase modifier monitoring system sends main excitation start order, and main excitation closed magnetic field breaks
Road device QF11, detects that QF11 is in main excitation start behind conjunction position, controls the Trigger Angle of fairing, gradually increase main excitation
Output current, the output current for starting excitation at this time are gradually reduced.Main excitation boosts to 25% phase modulation generator terminal rated voltage first,
Start when excitation detects set end voltage more than 20% and shut down, progressively disjunction QF01, QS02, QS01.
Step 3：Main excitation continues to boost to grid side system voltage in the case where detecting QF01 and QS02 disjunction
Perunit value, ensure pressure difference in the grid-connected pressure differential range that can allow for of synchronous device, treat that synchronous device is grid-connected.Due to excitation system
The voltage at the grid-connected both ends of adjusting of system is equal, therefore can realize that zero is idle grid-connected, reduces the grid-connected impact caused by pressure difference.
The present invention is to be proposed to meet that the startup of the large-scale phase modifier without prime mover dragging is grid-connected, a whole set of excitation system
System is independent mutually by two sets of exchange side and rectification unit, and DC side is in parallel, and shares the excitation of demagnetization and over-pressure safety device
System forms.Excitation system is referred to as to start excitation and main excitation.
Start excitation and encourage excitation system for it, only run in phase modifier startup stage, coordinate SFC dragging phase modifier turn ups
To the rotating speed of target more than 3000r/min.Its capacity is smaller, and control model can be current closed-loop or determine angle, set-point
Controlled by SFC, SFC realizes the closed-loop control of its torque or power by receiving actual exciting current.After being exited due to SFC
Demagnetizing effect disappears, and set end voltage will raise；Starting field regulator needs to reduce exciting current to ensure that set end voltage is low
In the phase modifier terminal voltage value that SFC can be born, it is ensured that the safety of SFC equipment.It also ensure that handoff procedure can be realized at the same time
Undisturbed.
Main excitation is self-shunt excitation system, mainly operate in phase modifier it is grid-connected after, provide reactive power support for power grid.
Starting excitation and main excitation need to be consistent in DC side parallel, the voltage class of DC side.According to startup excitation
Understood with the operating condition of main excitation, the field circuit breaker voltage of main excitation is high, and electric current is big, starts excitation without the big electricity of high voltage
The field circuit breaker of stream, meets the needs of startup stage.Opened to ensure that the high voltage during main excitation operation does not interfere with
Dynamic energized circuit, can use voltage class consistent, the different field circuit breaker of current class, also contemplates for reducing excitation system
Cost, reduces the space for starting energizing apparatus, real by the way of disconnecting switch of connecting after the field circuit breaker for starting excitation
The uniformity of existing DC side parallel voltage class.
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
- A kind of 1. excitation control method during large-scale phase modifier startup is grid-connected, it is characterised in that：Include the following steps：Step 1：Phase modifier startup stage, starts 4-20mA or the 0-20mA electricity that excitation receives stationary frequency starting device SFC Signal is flowed as given value of current value, and rotor current size is adjusted by current closed-loop mode, coordinates SFC dragging phase modifier turn ups To more than 3000r/min；After rotating speed arrival, phase modifier monitoring system is sent to SFC shuts down order, and SFC, which is performed, shuts down flow, together When SFC to start excitation send SFC exit instructions；Step 2：After SFC is exited completely, phase modifier monitoring system sends main excitation start order, main excitation closed magnetic field breaker QF11, detects that QF11 is in main excitation start behind conjunction position, controls the Trigger Angle of fairing, gradually increase the output of main excitation Electric current, at this time, the output current for starting excitation are gradually reduced；Main excitation boosts to 25% phase modulation generator terminal rated voltage first, starts Excitation detects shuts down when set end voltage is more than 20%, progressively disjunction QF01, QS02, QS01；Step 3：Main excitation continues to boost to the mark of grid side system voltage in the case where detecting QF01 and QS02 disjunction One value, treats that synchronous device is grid-connected.
- The excitation control method during 2. a kind of large-scale phase modifier startup according to claim 1 is grid-connected, its feature exist In：Start excitation in the step 1 and receive 4-20mA the or 0-20mA current signals of stationary frequency starting device SFC as electricity Set-point is flowed, rotor current size is adjusted by current closed-loop mode.
- The excitation control method during 3. a kind of large-scale phase modifier startup according to claim 1 is grid-connected, its feature exist In：Starting excitation in the step 1 coordinates SFC dragging phase modifier rotating speeds to reach 3150r/min.
- The excitation control method during 4. a kind of large-scale phase modifier startup according to claim 1 is grid-connected, its feature exist In：In the step 1 in SFC stopping process, 5% unloaded rated exciting current can be maintained by starting the given value of current value of excitation, be protected Card phase modulation set end voltage is less than the phase modulation set end voltage that SFC can bear.
- A kind of 5. excitation system during large-scale phase modifier startup is grid-connected, it is characterised in that：The excitation system includes：Start Excitation, main excitation, start excitation and encourage excitation system for it, be derived from station-service 400V power supplys, start excitation main circuit by startup transformation Device, fairing, field circuit breaker QF01, electric isolating switch QS02 are sequentially connected composition；Main excitation is shunt self excitation system System, main excitation main circuit are sequentially connected and are formed by exciting transformer, fairing, field circuit breaker QF11；Main excitation main circuit With start excitation main circuit in DC side parallel, share and be connected with the demagnetization and over-pressure safety device of phase modifier rotor-side, and The control of main excitation main circuit and startup excitation main circuit is completely independent.
- The excitation system during 6. a kind of large-scale phase modifier startup according to claim 5 is grid-connected, it is characterised in that：Also Including：AC isolation switch QS01, the AC isolation switch QS01 are arranged between station-service 400V power supplys and starting transformer.
- The excitation system during 7. a kind of large-scale phase modifier startup according to claim 5 is grid-connected, it is characterised in that：Institute It is identical with the rated voltage of field circuit breaker QF11 to state electric isolating switch QS02.
- The excitation system during 8. a kind of large-scale phase modifier startup according to claim 5 is grid-connected, it is characterised in that：Institute State electric isolating switch QS02 and can be replaced the magnetic field identical with field circuit breaker QF11 rated voltages with field circuit breaker QF01 Breaker.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109150041A (en) * | 2018-10-10 | 2019-01-04 | 邓光辉 | A kind of novel excitation circuit and device for synchronous generator |
| CN109586310A (en) * | 2018-11-26 | 2019-04-05 | 国网河南省电力公司电力科学研究院 | A kind of paired running phase modifier control method for coordinating based on tune difference |
| CN110212671A (en) * | 2019-05-22 | 2019-09-06 | 湖北研道特磁科技有限公司 | A kind of super-pressure phase modifier system applied in ultra-high voltage converter station |
| CN111277000A (en) * | 2020-02-26 | 2020-06-12 | 国网浙江省电力有限公司电力科学研究院 | Dynamic top voltage control method for flexible excitation system |
| CN111293938A (en) * | 2018-12-07 | 2020-06-16 | 南京南瑞继保电气有限公司 | Small gas turbine electrical integration system for excitation multiplexing SFC |
| CN112421760A (en) * | 2020-11-26 | 2021-02-26 | 科华恒盛股份有限公司 | Method and device for controlling exciting current of UPS (uninterrupted Power supply) isolation transformer |
| CN112910343A (en) * | 2021-01-08 | 2021-06-04 | 南京南瑞继保电气有限公司 | Bidirectional excitation loop of synchronous generator and synchronous generator set |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109150041A (en) * | 2018-10-10 | 2019-01-04 | 邓光辉 | A kind of novel excitation circuit and device for synchronous generator |
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| CN109586310A (en) * | 2018-11-26 | 2019-04-05 | 国网河南省电力公司电力科学研究院 | A kind of paired running phase modifier control method for coordinating based on tune difference |
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| CN110212671A (en) * | 2019-05-22 | 2019-09-06 | 湖北研道特磁科技有限公司 | A kind of super-pressure phase modifier system applied in ultra-high voltage converter station |
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| CN111277000A (en) * | 2020-02-26 | 2020-06-12 | 国网浙江省电力有限公司电力科学研究院 | Dynamic top voltage control method for flexible excitation system |
| CN112421760A (en) * | 2020-11-26 | 2021-02-26 | 科华恒盛股份有限公司 | Method and device for controlling exciting current of UPS (uninterrupted Power supply) isolation transformer |
| CN112421760B (en) * | 2020-11-26 | 2023-10-27 | 科华恒盛股份有限公司 | Method and device for controlling exciting current of UPS isolation transformer |
| CN112910343A (en) * | 2021-01-08 | 2021-06-04 | 南京南瑞继保电气有限公司 | Bidirectional excitation loop of synchronous generator and synchronous generator set |
| CN112910343B (en) * | 2021-01-08 | 2022-07-22 | 南京南瑞继保电气有限公司 | Bidirectional excitation loop of synchronous generator and synchronous generator set |
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