CN104833879A - Low-voltage crossing testing system for low-voltage auxiliary frequency converter of thermal power plant - Google Patents
Low-voltage crossing testing system for low-voltage auxiliary frequency converter of thermal power plant Download PDFInfo
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Abstract
A low-voltage crossing testing system for a low-voltage auxiliary frequency converter of a thermal power plant comprises the components of a voltage sag generator (2), a power electronic load (4), a low-voltage auxiliary frequency converter (1) and testing equipment. In the low-voltage crossing testing system, the input end of the voltage sag generator is connected with a 380V plant-used bus (6) through a switch Q2 and a switch Q1; the output end of the voltage sag generator is connected with the low-voltage auxiliary frequency converter through a switch Q3; the output end of the low-voltage auxiliary frequency converter is connected with the input end of the power electronic load through a switch Q4; the output end of the power electronic load is connected with the 380V plant-used bus through a switch Q5; a digital storage oscilloscope (3) acquires AC signals at the input end and the output end of the low-voltage auxiliary frequency converter through a current transformer; and a coal feeder control system (5) is connected with the 220V power supply through a switch Q6. The low-voltage crossing testing system for the low-voltage auxiliary frequency converter of the thermal power plant can simulate the actual working condition of the low-voltage auxiliary frequency converter and improves the low-voltage crossing capability of the low-frequency auxiliary frequency converter.
Description
Technical field
The present invention relates to a kind of thermal power plant low pressure subsidiary engine frequency converter low-voltage ride through detection system, belong to thermal power generating equipment technical field.
Background technology
Due to very universal on power station auxiliary equipment of frequency converter, we seldom noticed it in electric network fault to the harm that unit and electrical network bring in the past.In thermal power plant; one class subsidiary engine frequency converter especially coal supply (powder) machine frequency converter is important subsidiary engine equipment; current great majority adopt frequency control way to run; owing to lacking the knowledge to frequency converter low-voltage lockout protection aspect; a lot of power plant does not recognize that frequency converter can export when electrical network low voltage in locking, and causes all flames lost to protect (MFT) action chaser phenomenon.
The low voltage failure of fuel-burning power plant generally occurs in internal system or outside, and thunderbolt, electrical equipment short circuit or ground connection etc. all can cause station service transient voltage to reduce.Because converter plant is very responsive to voltage fluctuation; even when system generation transient fault causes voltage dip; relevant subsidiary engine also may shut down because frequency converter low voltage ride-through capability is not enough and low-voltage lockout protection occurs; due in the large interlocking of thermal power plant; what adopt is that interlocking is shut down in blowing out, and after boiler extinguishment, steam turbine connection is jumped, and generator main switch disconnects; lose the connection with electrical network, be incorporated into the power networks again after need restarting.Incident processing procedure is loaded down with trivial details and the time that is that need is long, does not match with the steady demand of electrical network.
The transient state that frequency converter and power supply object-based device external fault or disturbance cause, dynamically or long time power primary voltage is reduced in the low voltage crossing district of regulation time, can reliable power supply, ensure the safe operation of power supply object.Namely ensure that key equipment continues when power network fluctuation, stable work.
Summary of the invention
The object of the invention is, according to existing thermal power plant frequency conversion equipment Problems existing, 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 when power network fluctuation, stable and safe operation.
Realizing technical scheme of the present invention is, a kind of thermal power plant low pressure subsidiary engine frequency converter low-voltage ride through detection system, comprises voltage sag generator, power electronics load, low pressure subsidiary engine frequency converter and testing apparatus.
Voltage sag generator, for changing three-phase four-wire power supply system into three-phase three-wire system, by the adhesive of control contactor, being separated the moment realizing voltage and switching;
Power electronics load, for simulated machine inertial element, by arranging active power, reactive power simulated machine operation characteristic;
And for making the low pressure subsidiary engine frequency converter of measurand.
In a kind of thermal power plant of the present invention low pressure subsidiary engine frequency converter low-voltage ride through detection system, the input end of voltage sag generator is connected 380v auxiliary bus bar by voltage sag generator input switch Q2 with the service entrance switch Q1 of test macro; The output terminal of voltage sag generator connects low pressure subsidiary engine frequency converter by voltage sag generator output switch Q3; The output terminal of low pressure subsidiary engine frequency converter connects the input end of power electronics load by the input switch Q4 of power electronics load; The output terminal of power electronics load connects 380v auxiliary bus bar by power electronics load energy feedback switch Q5; Stored digital oscillograph gathers the AC signal of the input of low pressure subsidiary engine frequency converter, output terminal by current transformer; Coal feeder control system connects the 220V power supply of the output terminal of voltage sag generator input switch Q2 by tested subsidiary engine frequency converter secondary power supply switch Q6.
Described voltage sag generator is extraordinary air-core transformer structure, and pair becomes multiple winding, and the instant excitation that can not produce because of magnetic saturation shoves, and causes the damage of subsidiary engine frequency converter; The change of described voltage sag generator pair arranges 20%, 60%, 90%, 100%, 130% rated voltage.
Described extraordinary air-core transformer changes voltage, by set-up of control system low voltage crossing time and voltage by contactor adhesive/separation.
Described power electronics load is made up of controlled rectification link, intermediate DC link and inversion link.Described controlled rectification link is by three brachium pontis, and six IGBT and buffering reactor form; Intermediate DC link two electric capacity compositions; Inversion link is by four brachium pontis, and eight IGBT and filter reactor form; Three-phase supply inversion is three-phase four-wire power by power electronics load, three-phase supply enters controlled rectification link, after by controlled rectification link ac converter being direct current, enter intermediate DC link, carrying out the stable of stable DC link DC voltage by controlled rectification link, after treating voltage stabilization, is three-phase and four-line 50HZ power supply by inversion link by direct supply inversion, be connected to the grid, realize the feedback of energy.
Described low pressure subsidiary engine frequency converter is made up of rectifier, intermediate DC link and inverter; Uncontrollable rectification link is by three brachium pontis, and six diodes and buffering reactor form; Intermediate DC link, by two groups, often organizes two capacitor compositions; Inversion link is by three brachium pontis, and six IGBT form; It is direct current by exchange conversion that three-phase supply enters uncontrollable rectification link, enters intermediate DC link, then to inversion link, is the AC power of three-phase adjustable frequency by direct supply inversion.
Testing apparatus by detect low pressure subsidiary engine frequency converter input output voltage and electric current, time of accurate recording Voltage Drop, amplitude and frequency converter DC voltage.
Principle of work of the present invention is that voltage sag generator changes three-phase four-wire power supply system into three-phase three-wire system, and by relay K M adhesive/regulation voltage of assigning to, to low pressure subsidiary engine inverter supply; Low pressure subsidiary engine frequency converter, by changing output power and frequency, adjusts the rotating speed of motor, realizes the closed loop adjustment of system with this.Power electronics load is as the load of low pressure subsidiary engine frequency converter, and the three-phase three-wire system power source transition that low pressure subsidiary engine frequency converter exports is three-phase four-wire system feedback electrical network by power electronics load.Power electronics load be by AC/DC three-phase current is transformed to direct current after, change 380V/50HZ Voltage Feedback electrical network into by DC/AC link, reduce the loss of energy; Electronic load can simulated machine inertial element, by arranging active power, reactive power simulated machine operation characteristic.
The invention has the beneficial effects as follows, the present invention can simulate the operation characteristic of 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, improves the low voltage ride-through capability of low pressure subsidiary engine frequency converter; The transient state that frequency converter and power supply object-based device external fault or disturbance are caused, dynamically or long time power primary voltage is reduced in the low voltage crossing district of regulation time, still can reliable power supply, ensure the safe operation of power supply object.
Accompanying drawing explanation
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 tested subsidiary engine frequency converter; 2 is voltage sag generators; 3 is stored digital oscillographs; 4 is power electronics loads; 5 is coal feeder control systems; 6 is 380v auxiliary bus bars; 7 is transformer input ACs; 8 is be transformer output AC; Q1 is the service entrance switch of test macro; Q2 is voltage sag generator input switch; Q3 is voltage sag generator output switch; Q4 is the output of low pressure subsidiary engine frequency converter and the input switch of power electronics load, and Q5 is power electronics load energy feedback switch, and Q6 is tested subsidiary engine frequency converter secondary power supply switch.
Embodiment
The specific embodiment of the present invention as shown in Figure 4.
A kind of thermal power plant of the present embodiment low pressure subsidiary engine frequency converter low-voltage ride through detection system, comprises voltage sag generator 2, power electronics load 4, low pressure subsidiary engine frequency converter 1 and testing apparatus.
The input end of voltage sag generator 2 is connected 380v auxiliary bus bar 6 by voltage sag generator input switch Q2 with the service entrance switch Q1 of test macro; The output terminal of voltage sag generator 2 connects low pressure subsidiary engine frequency converter 1 by voltage sag generator output switch Q3; The output terminal of low pressure subsidiary engine frequency converter 1 connects the input end of power electronics load 4 by the input switch Q4 of power electronics load; The output terminal of power electronics load connects 380v auxiliary bus bar 6 by power electronics load energy feedback switch Q5; Testing apparatus stored digital oscillograph 3 gathers the input of low pressure subsidiary engine frequency converter 1, the AC signal of output terminal by current transformer; Coal feeder control system 5 connects the 220V power supply of the output terminal of voltage sag generator input switch Q2 by tested subsidiary engine frequency converter secondary power supply switch Q6.
In the present embodiment, voltage sag generator 2 changes three-phase four-wire power supply system into three-phase three-wire system, and by relay K M adhesive/regulation voltage of assigning to, powers to low pressure subsidiary engine frequency converter 1; Low pressure subsidiary engine frequency converter 1, by changing output power and frequency, adjusts the rotating speed of motor, realizes the closed loop adjustment of whole system with this.Power electronics load 4 is as the load of low pressure subsidiary engine frequency converter 1, and the three-phase three-wire system power source transition that low pressure subsidiary engine frequency converter 1 exports is three-phase four-wire system feedback electrical network by power electronics load 4.Power electronics load 4 be by AC/DC three-phase current is transformed to direct current after, change 380V/50HZ Voltage Feedback electrical network into by DC/AC link, reduce the loss of energy.
Claims (5)
1. thermal power plant's low pressure subsidiary engine frequency converter low-voltage ride through detection system, comprise the low pressure subsidiary engine frequency converter for making measurand, it is characterized in that, described system also comprises:
Voltage sag generator, for changing three-phase four-wire power supply system into three-phase three-wire system, by the adhesive of control contactor, being separated the moment realizing voltage and switching;
Power electronics load, for simulated machine inertial element, by arranging active power, reactive power simulated machine operation characteristic.
2. a kind of thermal power plant according to claim 1 low pressure subsidiary engine frequency converter low-voltage ride through detection system, it is characterized in that, the input end of described voltage sag generator is connected 380v auxiliary bus bar by voltage sag generator input switch Q2 with the service entrance switch Q1 of test macro; The output terminal of voltage sag generator connects low pressure subsidiary engine frequency converter by voltage sag generator output switch Q3; The output terminal of low pressure subsidiary engine frequency converter connects the input end of power electronics load by the input switch Q4 of power electronics load; The output terminal of power electronics load connects 380v auxiliary bus bar by power electronics load energy feedback switch Q5; Stored digital oscillograph gathers the AC signal of the input of low pressure subsidiary engine frequency converter, output terminal by current transformer; Coal feeder control system connects the 220V power supply of the output terminal of voltage sag generator input switch Q2 by tested subsidiary engine frequency converter secondary power supply switch Q6.
3. a kind of thermal power plant according to claim 1 low pressure subsidiary engine frequency converter low-voltage ride through detection system, it is characterized in that, described voltage sag generator is extraordinary air-core transformer structure, pair becomes multiple winding, the instant excitation that can not produce because of magnetic saturation shoves, and causes the damage of subsidiary engine frequency converter; The change of described voltage sag generator pair arranges 20%, 60%, 90%, 100%, 130% rated voltage.
4. a kind of thermal power plant according to claim 1 low pressure subsidiary engine frequency converter low-voltage ride through detection system, it is characterized in that, described power electronics load is made up of controlled rectification link, intermediate DC link and inversion link; Described controlled rectification link is by three brachium pontis, and six IGBT and buffering reactor form; Intermediate DC link two electric capacity compositions; Inversion link is by four brachium pontis, and eight IGBT and filter reactor form; Three-phase supply inversion is three-phase four-wire power by power electronics load, three-phase supply enters controlled rectification link, after by controlled rectification link ac converter being direct current, enter intermediate DC link, carrying out the stable of stable DC link DC voltage by controlled rectification link, after treating voltage stabilization, is three-phase and four-line 50HZ power supply by inversion link by direct supply inversion, be connected to the grid, realize the feedback of energy.
5. a kind of thermal power plant according to claim 1 low pressure subsidiary engine frequency converter low-voltage ride through detection system, it is characterized in that, described extraordinary air-core transformer changes voltage, by set-up of control system low voltage crossing time and voltage by contactor adhesive/separation.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN105406514A (en) * | 2015-12-30 | 2016-03-16 | 华北电力科学研究院有限责任公司 | Heat-engine plant subsidiary engine frequency converter control system and method |
| CN106093776A (en) * | 2016-07-25 | 2016-11-09 | 国网江西省电力科学研究院 | A kind of simulated machine load characteristic low voltage test system based on converter |
| 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 |
| CN107340444A (en) * | 2017-07-31 | 2017-11-10 | 国网上海市电力公司 | A kind of 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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| 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 |
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| CN105406514A (en) * | 2015-12-30 | 2016-03-16 | 华北电力科学研究院有限责任公司 | Heat-engine plant subsidiary engine frequency converter control system and method |
| 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 |
| CN106093776A (en) * | 2016-07-25 | 2016-11-09 | 国网江西省电力科学研究院 | A kind of simulated machine load characteristic low voltage test system based on converter |
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| 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 |
| CN107340444A (en) * | 2017-07-31 | 2017-11-10 | 国网上海市电力公司 | A kind of voltage ride-through test system and method |
| 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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