CN104833879B - A kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system - Google Patents
A kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system Download PDFInfo
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Abstract
A kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system, including voltage sag generator（2）, power electronics load（4）, low pressure subsidiary engine frequency converter（1）And test equipment.In detecting system of the present invention, the input terminal of voltage sag generator connects 380v auxiliary bus bars by switching Q2 with switch Q1（6）；The output terminal of voltage sag generator is by switching Q3 connection low pressure subsidiary engine frequency converters；The input terminal that the output terminal of low pressure subsidiary engine frequency converter is loaded by switching Q4 connections power electronics；The output terminal of power electronics load is by switching Q5 connection 380v auxiliary bus bars；Stored digital oscillograph（3）Inputted by current transformer collection low pressure subsidiary engine frequency converter, the AC signal of output terminal；Coal feeder control system（5）By switching Q6 connection 220V power supplys.The present invention can simulate the actual condition of low pressure subsidiary engine frequency converter by thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system, improve the low voltage ride-through capability of low pressure subsidiary engine frequency converter.
Description
Technical field
The present invention relates to a kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system, belongs to thermal power generating equipment technology neck
Domain.
Background technology
Since frequency converter is very universal in power station auxiliary equipment, we seldom noticed it in power grid event in the past
The harm brought in barrier to unit and power grid.In thermal power plant, a kind of subsidiary engine frequency converter especially gives coal（Powder）Machine frequency converter is weight
The subsidiary engine equipment wanted, it is most of at present to be run using frequency control way, due to lacking to frequency converter low-voltage lockout protection side
The knowledge in face, many power plant do not recognize that frequency converter can export in locking in electrical network low voltage, and cause all flames lost
Protection（MFT）Act chaser phenomenon.
The low voltage failure in thermal power plant typically occurs in internal system or outside, and lightning stroke, electrical equipment is short-circuit or connects
Ground etc. can all cause the reduction of station service transient voltage.Since converter plant is very sensitive to voltage fluctuation, even being sent out in system
When raw transient fault causes voltage dip, related subsidiary engine may also shut down because of frequency converter low voltage ride-through capability deficiency and
Generation low-voltage lockout is protected, due in the big interlocking of thermal power plant, shutting down and interlocking using blowing out, steamer after boiler extinguishment
Machine shunt tripping, generator main switch disconnect, lose the connection with power grid, be incorporated into the power networks again after need to restarting.Incident processing procedure
Time length that is cumbersome and needing, does not match that with the steady demand of power grid.
Transient state, dynamic or long time power primary voltage caused by frequency converter and supply object device external failure or disturbance
When in low voltage crossing area as defined in being reduced to, can reliable power supply, ensure the safe operation of supply object.Ensure that key is set
The standby work for continuing in power network fluctuation, stablizing.
The content of the invention
The object of the present invention is to according to existing thermal power plant's frequency conversion equipment there are the problem of, the present invention proposes a kind of thermal power plant
Low pressure subsidiary engine frequency converter low-voltage ride through detection system, to ensure that key equipment continues in power network fluctuation, stable and safety is transported
OK.
Realize the technical scheme is that, a kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system, bag
Include voltage sag generator, power electronics load, low pressure subsidiary engine frequency converter and test equipment.
Voltage sag generator, for three-phase four-wire power supply system to be changed into three-phase three-wire system, is contacted by controlling
The moment switching of voltage is realized in actuation, the separation of device；
Power electronics loads, for simulated machine inertial element, by setting active power, reactive power simulated machine to transport
Row characteristic；
And for making the low pressure subsidiary engine frequency converter of measurand.
In a kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system of the present invention, voltage sag generator it is defeated
Enter end and 380v auxiliary bus bars are connected with the service entrance switch Q1 of the system of test by voltage sag generator input switch Q2；Voltage is temporary
The output terminal for dropping generator exports switch Q3 connection low pressure subsidiary engine frequency converters by voltage sag generator；Low pressure subsidiary engine frequency converter
The input terminal that loads of the input switch Q4 connections power electronics that is loaded by power electronics of output terminal；Power electronics loads defeated
Outlet passes through power electronics load energy feedback switch Q5 connection 380v auxiliary bus bars；Stored digital oscillograph passes through Current Mutual Inductance
The input of device collection low pressure subsidiary engine frequency converter, the AC signal of output terminal；Coal feeder control system is by being tested subsidiary engine frequency converter two
The 220V power supplys of the output terminal of secondary source switch Q6 connection voltage sag generator input switches Q2.
The voltage sag generator is extraordinary air-core transformer structure, and pair is changed into multiple windings, will not be because of magnetic saturation
And the instant excitation produced shoves, the damage of subsidiary engine frequency converter is caused；The voltage sag generator is secondary become set 20%, 60%,
90%th, 100%, 130% rated voltage.
The special type air-core transformer is attracted/is separated by contactor to change voltage, passes through the low electricity of set-up of control system
Press crossing time and voltage.
The power electronics load is made of controlled rectification link, intermediate DC link and inversion link.It is described controllable whole
Link is flowed by three bridge arms, six IGBT and buffering reactor composition；Two capacitance compositions of intermediate DC link；Inversion link by
Four bridge arms, eight IGBT and filter reactor composition；Three phase mains inversion is three-phase four-wire power by power electronics load,
Three phase mains enters controlled rectification link, by controlled rectification link by ac converter be direct current after, into intermediate dc ring
Section, by controlled rectification link come the stabilization of stable DC link DC voltage, after treating voltage stabilization, passing through inversion link will
DC power supply inversion is three-phase and four-line 50HZ power supplys, is connected to the grid, realizes the feedback of energy.
The low pressure subsidiary engine frequency converter is made of rectifier, intermediate DC link and inverter；Uncontrollable rectification link by
Three bridge arms, six diodes and buffering reactor composition；By two groups, every group of two capacitor forms intermediate DC link；It is inverse
Become link by three bridge arms, six IGBT compositions；It is direct current that three phase mains, which enters uncontrollable rectification link by exchange conversion, is entered
Intermediate DC link, then to inversion link, by the AC power that DC power supply inversion is three-phase adjustable frequency.
Test equipment by detect low pressure subsidiary engine frequency converter input output voltage and electric current, accurate recording Voltage Drop
Time, amplitude and frequency converter DC voltage.
The operation principle of the present invention is that three-phase four-wire power supply system is changed into phase three-wire three by voltage sag generator
System, and be attracted by relay KM/point voltage is adjusted, to low pressure subsidiary engine inverter supply；Low pressure subsidiary engine frequency converter is by changing
Become output power and frequency, the rotating speed of motor is adjusted with this, realize that the closed loop of system is adjusted.Power electronics load is auxiliary as low pressure
The three-phase three-wire system power source transition of low pressure subsidiary engine frequency converter output is three-phase and four-line by the load of machine frequency converter, power electronics load
System feedback power grid.Power electronics load is after three-phase current is transformed to direct current by AC/DC, is changed by DC/AC links
For 380V/50HZ Voltage Feedback power grids, the loss of energy is reduced；Electronic load can pass through setting with simulated machine inertial element
Active power, reactive power simulated machine operation characteristic.
The invention has the advantages that the present invention can by thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system
The operation characteristic of the actual condition of low pressure subsidiary engine frequency converter is simulated, improves the low voltage ride-through capability of low pressure subsidiary engine frequency converter；Make
Transient state, dynamic or long time power primary voltage caused by frequency converter and supply object device external failure or disturbance are reduced to rule
When in fixed low voltage crossing area, reliable power supply still is able to, ensures the safe operation of supply object.
Brief description of the drawings
Fig. 1 is low pressure subsidiary engine frequency changer schematic diagram；
Fig. 2 is power electronics load principle figure；
Fig. 3 is voltage sag generator schematic diagram；
Fig. 4 is low pressure subsidiary engine transducer testing system；
In figure, 1 is subject subsidiary engine frequency converter；2 be voltage sag generator；3 be stored digital oscillograph；4 be electric power electricity
Son load；5 be coal feeder control system；6 be 380v auxiliary bus bars；7 be transformer input AC；8 be to export to hand over for transformer
Stream；Q1 is the service entrance switch of test system；Q2 is voltage sag generator input switch；Q3 opens for voltage sag generator output
Close；Q4 is that the output of low pressure subsidiary engine frequency converter is the input switch of power electronics load, and Q5 feeds back for power electronics load energy
Switch, Q6 are tested subsidiary engine frequency converter secondary power supply switch.
Embodiment
The embodiment of the present invention is as shown in Figure 4.
A kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system of the present embodiment, including voltage sag generator
2nd, power electronics load 4, low pressure subsidiary engine frequency converter 1 and test equipment.
The input terminal of voltage sag generator 2 is opened by the inlet wire of voltage sag generator input switch Q2 and test system
Close Q1 connection 380v auxiliary bus bars 6；The output terminal of voltage sag generator 2 exports switch Q3 connections by voltage sag generator
Low pressure subsidiary engine frequency converter 1；The input switch Q4 connections electric power electricity that the output terminal of low pressure subsidiary engine frequency converter 1 is loaded by power electronics
The input terminal of son load 4；The output terminal of power electronics load passes through power electronics load energy feedback switch Q5 connection 380v factories
With busbar 6；Test equipment stored digital oscillograph 3 gathers the input of low pressure subsidiary engine frequency converter 1, output terminal by current transformer
AC signal；Coal feeder control system 5 switchs Q6 connection voltage sag generators by tested subsidiary engine frequency converter secondary power supply
The 220V power supplys of the output terminal of input switch Q2.
Three-phase four-wire power supply system is changed into three-phase three-wire system by voltage sag generator 2 in the present embodiment, and is passed through
Relay KM is attracted/point voltage is adjusted, power to low pressure subsidiary engine frequency converter 1；Low pressure subsidiary engine frequency converter 1 is by varying output work
Rate and frequency, the rotating speed of motor is adjusted with this, realizes that the closed loop of whole system is adjusted.Power electronics load 4 is used as low pressure subsidiary engine
The load of frequency converter 1, the three-phase three-wire system power source transition that power electronics load 4 exports low pressure subsidiary engine frequency converter 1 is three-phase four
Line system feeds back power grid.Power electronics load 4 is after three-phase current is transformed to direct current by AC/DC, is turned by DC/AC links
It is changed into 380V/50HZ Voltage Feedback power grids, reduces the loss of energy.
Claims (4)
1. a kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system, including for making the low pressure subsidiary engine of measurand
Frequency converter, it is characterised in that the system also includes：
Voltage sag generator, for three-phase four-wire power supply system to be changed into three-phase three-wire system, passes through control contactor
It is attracted or separation realizes that the moment of voltage switches；
Power electronics loads, for simulated machine inertial element, by setting active power and reactive power simulated machine to run
Characteristic；
The input terminal of the voltage sag generator is opened by the inlet wire of voltage sag generator input switch Q2 and detecting system
Close Q1 connection 380v auxiliary bus bars；The output terminal of voltage sag generator is low by voltage sag generator output switch Q3 connections
Press subsidiary engine frequency converter；The input switch Q4 connection power electronics that the output terminal of low pressure subsidiary engine frequency converter is loaded by power electronics is born
The input terminal of load；The output terminal of power electronics load is female by power electronics load energy feedback switch Q5 connection 380v station-services
Line；Stored digital oscillograph gathers the AC signal of low pressure subsidiary engine frequency converter input and output side by current transformer；To coal
Machine control system switchs Q6 connection voltage sag generator input switches Q2 by tested low pressure subsidiary engine frequency converter secondary power supply
Output terminal 220V power supplys.
2. a kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system according to claim 1, its feature exist
In the voltage sag generator is air-core transformer structure, and pair is changed into multiple windings, the wink that will not be produced because of magnetic saturation
When excitation surge current, cause the damage of low pressure subsidiary engine frequency converter；The voltage sag generator is secondary become set 20%, 60%, 90%,
100% or 130% rated voltage.
3. a kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system according to claim 1, its feature exist
In the power electronics load is made of controlled rectification link, intermediate DC link and inversion link；The controlled rectification link
By three bridge arms, six IGBT and buffering reactor composition；Intermediate DC link is composed in series by two capacitances；Inversion link by
Four bridge arms, eight IGBT and filter reactor composition；Three phase mains inversion is three-phase four-wire power by power electronics load,
Three-phase three-wire system power supply enters controlled rectification link, by controlled rectification link by ac converter be direct current after, into centre
DC link, stablizes the stabilization of intermediate DC link DC voltage by controlled rectification link, after treating voltage stabilization, passes through
DC voltage inversion is three-phase and four-line 50Hz power supplys by inversion link, is connected to the grid, is realized the feedback of energy.
4. a kind of thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system according to claim 2, its feature exist
In the air-core transformer is attracted/is separated by contactor to change voltage, passes through the set-up of control system low voltage crossing time
And voltage.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105403776A (en) * | 2015-09-07 | 2016-03-16 | 国网安徽省电力公司电力科学研究院 | Test method of low voltage ride-through capability of frequency converter based on magnetic powder brake |
| CN105334412A (en) * | 2015-10-13 | 2016-02-17 | 国网安徽省电力公司 | Auxiliary machine high/low voltage rid-through test method based on voltage disturbance generator |
| CN105406514B (en) * | 2015-12-30 | 2017-12-08 | 华北电力科学研究院有限责任公司 | A kind of power station auxiliary frequency converter control system and method |
| CN106093776B (en) * | 2016-07-25 | 2023-06-16 | 国网江西省电力科学研究院 | Frequency converter-based low-voltage test system for load characteristics of analog motor |
| CN106443268A (en) * | 2016-10-21 | 2017-02-22 | 国网江苏省电力公司 | Low-voltage ride-through capability detection device and method of low-voltage auxiliary engine frequency converter of thermal power plant |
| CN107340444B (en) * | 2017-07-31 | 2023-08-01 | 国网上海市电力公司 | Voltage ride-through test system and method |
| CN107607886A (en) * | 2017-09-11 | 2018-01-19 | 国网江西省电力公司电力科学研究院 | Thermal power plant's low pressure subsidiary engine frequency converter low voltage crossing Portable movable test device |
| CN110022081A (en) * | 2019-04-26 | 2019-07-16 | 国网福建省电力有限公司南平供电公司 | A kind of distributed inverter and its dq transformation Static Decoupling Control method with route selection function |
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Inventor after: Xu Zaide Inventor after: Li Shiyi Inventor after: Xia Yonghong Inventor after: Fan Ruixiang Inventor after: Ji Qingzhao Inventor after: Kang Chen Inventor after: Zhang Yan Inventor before: Xu Zaide Inventor before: Xia Yonghong Inventor before: Fan Ruixiang Inventor before: Ji Qingzhao |
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Effective date of registration: 20180725 Address after: 330096 No. 88, min Qiang Road, private science and Technology Park, Nanchang, Jiangxi Co-patentee after: State Grid Corporation of China Patentee after: Power Science Research Institute of Jiangxi Electric Power Co., Ltd. Address before: 100761 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing Co-patentee before: State's net Jiangxi Province Electric power Science Academe Patentee before: State Grid Corporation of China |