CN102346223B - Power evaluation system of frequency converter in energy two-way transmission rectification mode and test method of power evaluation system - Google Patents
Power evaluation system of frequency converter in energy two-way transmission rectification mode and test method of power evaluation system Download PDFInfo
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- CN102346223B CN102346223B CN 201110237211 CN201110237211A CN102346223B CN 102346223 B CN102346223 B CN 102346223B CN 201110237211 CN201110237211 CN 201110237211 CN 201110237211 A CN201110237211 A CN 201110237211A CN 102346223 B CN102346223 B CN 102346223B
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Abstract
The invention discloses a power evaluation system of a frequency converter in an energy two-way transmission rectification mode and a test method of the power evaluation system. The power evaluation system comprises a low-voltage high-current power evaluation system and a light-load joint debugging power evaluation system. The factory power elevation system of the frequency converter and the testmethod disclosed by the invention are suitable for factory routine test power evaluation of the frequency converter a rectifying module of which adopts an energy two-way transmission PWM (Pulse WidthModulation) rectification mode. The elevation system and the test method thereof disclosed by the invention have the advantages of simple design, low cost, high reliability, high actual application stability, strong generality and capability of saving electric energy.
Description
Technical field
The present invention relates to frequency converter, specifically is a kind of employing energy transmitted in both directions rectifier system transducer power checking system and test method thereof.
Background technology
Frequency converter is to utilize the on-off action of power semiconductor device power frequency supply to be transformed to the electric energy control device of another frequency power supply.Power frequency supply (50Hz or 60Hz) is transformed into the AC power of various frequencies, to realize the equipment to motor speed-changing operation control, wherein control circuit is finished the control to main circuit, rectification circuit is transformed into direct current with alternating current, direct-flow intermediate circuit carries out smothing filtering to the output of rectification circuit, and inverter circuit becomes direct current another mistake into alternating current.
Along with the develop rapidly of China's Semiconductor Converting Technology, frequency converter is more and more wider in the application popularization rate that high voltage power transmission, industry become fields such as transmission, electric propulsion; Its power is also increasing, and the frequency converter of MW class is very common at present.Whether dispatch from the factory current power examination of frequency converter mainly is big electric current (generally being rated current) to the logical certain hour of main circuit of frequency converter, stable and whether the temperature rise situation is stable in the electric current output that passes under the big current work situation in order to verify frequency converter (particularly big-power transducer).In order to ensure stablizing of quality behind the product export and performance, manufacturer generally all needs frequency converter is carried out the current power examination test of certain hour; And on the market at frequency converter dispatch from the factory current power examination test macro build mode and wire examination method is not quite similar.Trace sth. to its source, greatly reason is current power examination test power consumption big (that have even big with the rated power of frequency converter etc.) because frequency converter dispatches from the factory, if adopt the resistance sense load as high-power examination load (have or even full power examination), its thermal value and waste of electric energy are well imagined; Motor is to towing back to feedback load checking system back-to-back if adopt, and it is also quite expensive that it builds cost.
At present general subject matter that power checking system and method exist is to dragging motor load to dispatch from the factory back-to-back: test macro is built the cost costliness, maintenance and maintenance is complicated, cost is high and versatility is poor.
Summary of the invention
Technical matters to be solved by this invention is, at the prior art deficiency, a kind of employing energy transmitted in both directions rectifier system transducer power checking system and test method thereof are provided, guarantee test mass, promote testing efficiency, improve plant factor, save the equipment input cost, energy-saving and emission-reduction, short form test person's Getting Started Steps threshold reduces potential safety hazard.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of energy transmitted in both directions rectifier system transducer power checking system, comprise AC power, pressure regulator, transformer, the rectifier power source cabinet, direct supply output connection cabinet, AC power output connection cabinet, tested frequency converter commutation system, tested frequency converter inversion system, it is characterized in that, AC power, pressure regulator, transformer divides two-way after connecting successively: the one tunnel connects direct supply output connection cabinet through the rectifier power source cabinet, direct supply output connection cabinet is also received the tested frequency converter commutation system of low-voltage, high-current power checking system and the positive and negative port of the middle dc voltage between the tested frequency converter inversion system, commutation system and inversion system are formed tested frequency converter, low-voltage, high-current power checking system is by two cover inductive loads, the one tested frequency converter commutation system of cover and the tested frequency converter inversion system of a cover are formed, inductive load is made up of three inductance Y-connections, commutation system and inversion system series connection, the output terminal of commutation system and inversion system connect a cover inductive load respectively; Another road connects tested frequency converter input end through AC power output connection cabinet, underloading uniting and adjustment power checking system is connected and composed successively by tested frequency converter commutation system, tested frequency converter inversion system, resistance sense load, and the resistance sense load is made up of the branch road Y-connection that resistance and inductance are composed in series.
As preferred version, described transformer is the high-voltage alternating transformer; Described inductive load is little impedance large current load; Described resistance sense load is the little current loading of high impedance.
The test method of energy transmitted in both directions rectifier system transducer power checking system comprises the examination of low-voltage, high-current power and underloading uniting and adjustment power examination two parts:
(1) low-voltage, high-current power examination step is as follows:
The first step: relevant main circuit and the operation circuit of tested frequency converter are connected, export the termination inductive load as the examination load in AC load;
Second step: control turning on and off of frequency converter power electronic power device by PWM or PAM mode, the alternating current that makes inverting output terminal produce the variable ratio frequency changer transformation is exported, reaching the ac output end load with adjusting can make the big current lead-through of load stable by till the stable big electric current;
The 3rd step: after the big current lead-through of load is stable, make tested frequency converter keep this duty a period of time, with parts and the stable criterion that reaches the low-voltage, high-current power examination requirement of dispatching from the factory as tested frequency converter of parts connector temperature rise situation;
(2) system's underloading uniting and adjustment power examination step of tested frequency converter is as follows:
The first step: relevant main circuit and the operation circuit of tested frequency converter are connected, export the load of termination resistance sense as the examination load in load;
Second step: control turning on and off of frequency converter power electronic power device by PWM or PAM mode, the alternating current that makes inverter output terminal produce the variable ratio frequency changer transformation is exported, till reaching the ac output end load and can keep the stable specified alternating voltage of output with adjusting, make load terminal voltage and current stabilization;
The 3rd step: after load terminal voltage and the current stabilization, make tested frequency converter keep this duty a period of time, each parts insulate can be stablized the criterion that reaches the underloading uniting and adjustment power examination requirement of dispatching from the factory as tested frequency converter.
As preferred version, in the examination of low-voltage, high-current power, after the big current lead-through of load was stable, the time that tested frequency converter is kept stable duty was recommended as 40 minutes; In system's underloading uniting and adjustment power examination of tested frequency converter, after load terminal voltage and the current stabilization, the time that tested frequency converter is kept stable duty is recommended as 15 minutes.
As preferred version, in the described low-voltage, high-current power examination step, regulate the ac output end load by the electric current of 1.1 times of rated current sizes; In system's underloading uniting and adjustment power examination step of described tested frequency converter, regulate the ac output end load and keep stable rated voltage.
Below the present invention will be further described.
Power checking system and test method are suitable for the routine test power examination of dispatching from the factory of the PWM rectifier system frequency converter (adopting the four-quadrant bridge rectifier mode of IGBT or IGCT as current device) of rectification module employing energy transmitted in both directions but frequency converter of the present invention dispatches from the factory.The test principle of the inventive method is as follows:
The examination of low-voltage, high-current power: though the watt current very big (up to 1800A) in our the low-voltage, high-current power examination process, owing to adopted the sense of little impedance large-current electric as examination load, effectively pressure drop very low (generally having only about 70V); So the useful power that consumes is relatively just very low.
Load conducting line current I with tested frequency converter in the process of the test
L=1800A, load active line pressure drop U
L=70V, powerfactorcos=0.85 is example:
Tested inverter load end active power:
The power checking system of dispatching from the factory of frequency converter of the present invention selects for use inductance (little impedance large current load) as low-voltage, high-current examination load, has taken full advantage of voltage, electric current and the frequency characteristic of inductive load.
Underloading uniting and adjustment power examination: though the output voltage very high (up to 10KV) in our the underloading uniting and adjustment power examination process, but because the resistance sense that has adopted the little electric current of high impedance is as the examination load, watt current little (generally controlling about 40A) is so the useful power that consumes is relatively just very low.
Load active line pressure drop U with tested frequency converter in the process of the test
L=3300V, load conducting line current I
L=40A, powerfactorcos=0.85 is example:
Tested inverter load end active power:
The power checking system of dispatching from the factory of frequency converter of the present invention selects for use resistance sense (the little current loading of high impedance) as underloading uniting and adjustment power examination load, has taken full advantage of voltage, electric current and the frequency characteristic of resistance and inductor combination load.
Checking system of the present invention and test method thereof also are applicable to the power examination test of dispatching from the factory of two level and many level (3 level and more than 3 electricity) frequency converter, checking system simplicity of design of the present invention, cost is low, reliability is high, practical application stability is high, its test method highly versatile.
The power that will dispatch from the factory examination is divided into the examination of low-voltage, high-current power and underloading uniting and adjustment power examination (examination of high voltage-small current power) two parts, analyze from power examination characteristic and details, its advantage very obviously: at first, though low-voltage, high-current power examination conducting electric current is very big, pressure drop is low; Because the effective voltage of low-voltage, high-current power examination is very low, so examination power is also very little, so (the conventional test method is because pressure drop is big with suitable the doing greatly of electric current under the situation that the frequency converter performance allows, be limited by the influence of experiment power supply finite capacity, it is very big that general electric current can not be done), so also just also improved the examination grade in the same examination time, this also just can accomplish equal the examination examination time of saving out a part under the situation about requiring, and has improved test efficiency; Secondly, because underloading uniting and adjustment power examination (examination of high voltage-small current power) is though electric pressure is very high, but electric current is little, so can select for use the smaller lead in line footpath to carry out the connection of main circuit, so also just can simplify and make things convenient for the wiring operation, reduce setting up time, can also suitably reduce the potential safety hazard in the operating process simultaneously, functional structure simplicity of design of the present invention, cost is low, reliability is high, and practical application stability is high; Energy-saving and emission-reduction have reduced potential safety hazard, have reduced the input of production cost; The system endurance coverage rate is higher; Highly versatile.
Description of drawings
Fig. 1 for motor back-to-back to dragging load test checking system topological structure synoptic diagram; (a) back-to-back motor to dragging load test checking system topological structure synoptic diagram one; (b) back-to-back motor to dragging load test checking system topological structure synoptic diagram two;
Fig. 2 is power checking system structural drawing of the present invention;
Fig. 3 is low-voltage, high-current power checking system topological structure sketch (specified intermediate dc input);
Fig. 4 is underloading uniting and adjustment power examination (examination of high voltage-small current power) system topology sketch.
Wherein:
1: pressure regulator; 2: transformer; 3: the rectifier power source cabinet; 4: direct supply output connection cabinet; 5: AC power output connection cabinet; 6: commutation system; 7: inversion system.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
Energy transmitted in both directions rectifier system transducer power checking system comprises AC power, pressure regulator 1, transformer 2, rectifier power source cabinet 3, direct supply output connection cabinet 4, AC power output connection cabinet 5, commutation system 6, inversion system 7, AC power, pressure regulator 1, transformer 2 divides two-way after connecting successively: the one tunnel connects direct supply output connection cabinet 4 through rectifier power source cabinet 3, direct supply output connection cabinet 4 is also received the commutation system 6 of low-voltage, high-current power checking system and the positive and negative port of the middle dc voltage between the inversion system 7, low-voltage, high-current power checking system is by two cover inductive loads, one cover commutation system and a cover inversion system are formed, inductive load is made up of three inductance Y-connections, commutation system and inversion system series connection, the output terminal of commutation system and inversion system connect a cover inductive load respectively; Another road connects underloading uniting and adjustment power checking system through AC power output connection cabinet 5, underloading uniting and adjustment power checking system is connected and composed successively by commutation system 6, inversion system 7, resistance sense load, the resistance sense load is made up of the branch road Y-connection that resistance and inductance are composed in series, and commutation system 6 and inversion system 7 are formed tested frequency converter.The rectifier system of rectifier power source cabinet adopts uncontrollable rectification (diode bridge rectification); Adjusting pressure regulator TM1 can change the size of pressure regulator time limit output voltage, regulates direct supply DC voltage (DC) output and the big or small purpose of AC power alternating voltage (AC) output to reach, and satisfies the different power demands of tested frequency converter (DUT).
Power checking system and test method are suitable for the routine test power examination of dispatching from the factory of the PWM rectifier system frequency converter (adopting the four-quadrant bridge rectifier mode of IGBT or IGCT as current device) of rectification module employing energy transmitted in both directions but frequency converter of the present invention dispatches from the factory.According to the operating characteristic of frequency converter and the power examination requirement of dispatching from the factory, the power that will dispatch from the factory examination is divided into the examination of low-voltage, high-current power and underloading uniting and adjustment power examination (examination of high voltage-small current power) two parts.
Low-voltage, high-current power examination: with the ac output end load of pure inductance (little impedance large current load) as frequency converter, give frequency converter intermediate dc input end input rated direct voltage, simultaneously rectification module is carried out low-voltage, high-current power when inversion module control and examine; Control the turning on and off of frequency converter power electronic power device (alternating current that makes inverting output terminal produce the variable ratio frequency changer transformation is exported) by PWM (or PAM) mode, regulate and reach the ac output end load and can pass through stable big electric current; With the current characteristics of examination frequency converter electronic power convertor spare, induction reactance device, parts connector etc., and the stability etc. of temperature rise situation in the examination process.
Concrete test procedure is described below:
The first step: relevant main circuit and the operation circuit of tested frequency converter (DUT) are connected, connect suitable inductance (little impedance large current load) as examination load (specifically as shown in Figure 3) at the AC load output terminal.
Second step: control the turning on and off of frequency converter power electronic power device (alternating current that makes inverting output terminal produce the variable ratio frequency changer transformation is exported) by PWM (or PAM) mode, reaching the ac output end load with adjusting can be by (generally controlling 1.1 times in the rated current size till the stable big electric current; Certainly, as long as tested frequency converter performance allows, that also electric current can be done is bigger).
The 3rd step: after the big current lead-through of load is stable, make tested frequency converter keep this duty a period of time (being recommended as about 40 minutes).Simultaneously, input voltage, the output current parameter stability that should note monitoring tested frequency converter in the examination process do not have obvious fluctuation, the stable criterion that reaches the low-voltage, high-current power examination requirement of dispatching from the factory as tested frequency converter that waits of each parts and parts connector temperature rise situation.
Underloading uniting and adjustment power examination: with the interchange output load of resistance sense load (the little current loading of high impedance) as frequency converter, give frequency converter input end input rated voltage (as shown in Figure 4), control the turning on and off of frequency converter power electronic power device (alternating current that makes inverter output terminal produce the variable ratio frequency changer transformation is exported) by PWM (or PAM) mode, regulate and reach the ac output end load and can keep the stable specified alternating voltage of output; With the withstand voltage ability of examination frequency converter electronic power convertor spare, capacitive device, induction reactance device, impedance device etc., and the electrical insulation properties between inner each device of product etc.
Concrete test procedure is described below:
The first step: relevant main circuit and the operation circuit of tested frequency converter (DUT) are connected, engage suitable resistance sense load (the little current loading of high impedance) as examination load (specifically as shown in Figure 4) at the load output terminal.
Second step: control turning on and off of frequency converter power electronic power device by PWM (or PAM) mode, (alternating current that makes inverter output terminal produce the variable ratio frequency changer transformation is exported) reaches with adjusting and (generally controls and decide the output voltage values size in maximum amount till the ac output end load can be kept the stable specified alternating voltage of output; Certainly, as long as tested frequency converter performance allows, that also voltage can be done is higher; Simultaneously, recommend the conducting Current Control about 40A, to be advisable).
The 3rd step: after load terminal voltage and the current stabilization, make tested frequency converter keep this duty a period of time (being recommended as about 15 minutes).Simultaneously, output voltage, the output current parameter stability that should note monitoring tested frequency converter in the examination process do not have obvious fluctuation, and each parts insulate can be stablized grade and reach the criterion that the underloading uniting and adjustment power examination of dispatching from the factory requires as tested frequency converter.
Claims (1)
1. the test method of an energy transmitted in both directions rectifier system transducer power checking system is characterized in that, this method comprises system's underloading uniting and adjustment power examination two parts of the examination of low-voltage, high-current power and tested frequency converter:
(1) low-voltage, high-current power examination step is as follows:
The first step: relevant main circuit and the operation circuit of tested frequency converter are connected, export the termination inductive load as the examination load in AC load;
Second step: control turning on and off of frequency converter power electronic power device by PWM or PAM mode, the alternating current that makes inverting output terminal produce the variable ratio frequency changer transformation is exported, with adjusting reach the ac output end load can the electric current by 1.1 times of rated current sizes till, make the big current lead-through of load stable;
The 3rd step: after the big current lead-through of load is stable, make tested frequency converter keep stable duty 40 minutes, with parts and the stable criterion that reaches the low-voltage, high-current power examination requirement of dispatching from the factory as tested frequency converter of parts connector temperature rise situation;
(2) system's underloading uniting and adjustment power examination step of tested frequency converter is as follows:
The first step: relevant main circuit and the operation circuit of tested frequency converter are connected, export the load of termination resistance sense as the examination load in load;
Second step: control turning on and off of frequency converter power electronic power device by PWM or PAM mode, the alternating current that makes inverter output terminal produce the variable ratio frequency changer transformation is exported, till reaching the ac output end load and can keep the stable specified alternating voltage of output with adjusting, make load terminal voltage and current stabilization;
The 3rd step: after load terminal voltage and the current stabilization, make tested frequency converter keep stable duty 15 minutes, each parts insulate can be stablized the criterion that reaches the underloading uniting and adjustment power examination requirement of dispatching from the factory as tested frequency converter.
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| CN 201110237211 CN102346223B (en) | 2011-08-18 | 2011-08-18 | Power evaluation system of frequency converter in energy two-way transmission rectification mode and test method of power evaluation system |
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| EP3237915A4 (en) * | 2014-12-25 | 2018-01-03 | Texas Instruments Incorporated | Bi-directional electric energy meter |
| CN104730387B (en) * | 2015-03-25 | 2018-01-30 | 深圳市禾望电气股份有限公司 | The aging equipment and method of frequency conversion power unit |
| CN106199242A (en) * | 2016-06-27 | 2016-12-07 | 湖南中车特种电气装备有限公司 | A kind of traction convertor pilot system and method |
| CN111669061B (en) * | 2020-05-20 | 2021-03-02 | 浙江大学 | Anti-system of dragging and wind generating set |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101943732A (en) * | 2009-11-27 | 2011-01-12 | 深圳市科陆变频器有限公司 | Frequency converter test platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101943732A (en) * | 2009-11-27 | 2011-01-12 | 深圳市科陆变频器有限公司 | Frequency converter test platform |
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| 一种新型高压变频器低能耗负载试验方法的研究;陈启江等;《电气技术》;20061231(第6期);59-63 * |
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