CN2879212Y - New high-voltage transducer low energy consuming load testing device - Google Patents
New high-voltage transducer low energy consuming load testing device Download PDFInfo
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- CN2879212Y CN2879212Y CN 200520099281 CN200520099281U CN2879212Y CN 2879212 Y CN2879212 Y CN 2879212Y CN 200520099281 CN200520099281 CN 200520099281 CN 200520099281 U CN200520099281 U CN 200520099281U CN 2879212 Y CN2879212 Y CN 2879212Y
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Abstract
This device is a low-energy-consumption load test device for new style high voltage frequency converter, which connects with a distribution network bus bar (1) to the frequency converter (3) via isolation transformer (2). Series connection of the output end of the frequency converter to resistance-inductance load (4) is performed, and then parallel connecting is performed with the bus bar. Between the frequency converter (3) and the resistance-inductance load (4), voltage transformer (5) and current transformer (6) are connected. Amplitude and potential of the output voltage of the frequency converter can be modified. Detection of the voltage of the resistance of the resistance-inductance load and finding out the minimum value can alter PLC output pulse or modulation signal. In this way, the current of the system can be controlled and testing on operational conditions of various current working condition units can be completed. The current of the system, after being detected by the current transformer, is sent to PLC for monitoring. The utility model has the following advantages and effects: 1. motor is not required in the testing process; 2. the controlling processing is easier for testing of the high voltage transformer is divided into two steps; 3. testing system is simple, stable, secured and with high practicability; 4. low energy consumption due to the fact that there are only energy consumption in the frequency converter and load current-limiting resistance.
Description
Technical field
The utility model belongs to interchange transmission speed system control technology field, specially refers to a kind of high-voltage variable-frequency and variable-speed system variator low energy-consumption load testing device.
Background technology
Develop rapidly along with modern industry, the application of high-tension motor more and more widely, it is the major impetus in the industrial and mining enterprises, in the large and medium-sized factories and miness of industries such as metallurgy, iron and steel, chemical industry, water treatment, need drag various high-power machinery equipment such as blower fan, pump class, compressor.Because traditional kinematic train is made up of " motor-work mechanism ", causes a large amount of wastes of the energy and the reduction of equipment life, therefore has energy-efficient high voltage converter by the extensively employing of modern kinematic train institute.In the high voltage converter production run, in order to examine the operation conditions of each each power model of unit, overall test before must dispatching from the factory, but because of its power too big, the test that directly is connected to the grid will cause a large amount of wastes of electric energy, and increased enterprise cost, how to carry out effectively, easy, low energy consumption test will seem extremely important.
Test method for high voltage converter mainly contains two kinds at present: the one, and " AC-DC-AC " AC drive experiment system, promptly power to asynchronous machine by high voltage converter, the coaxial drive Dyn. of asynchronous machine, Dyn. drives direct current motor again, the coaxial again drive three-phase synchronous AC generator of direct current motor sends electric energy and is fed back to electrical network, realizes the test of high voltage converter various characteristics therebetween by the exciting current of regulating each motor; The 2nd, " the two inverter-double motor " that proposes presented pilot system mutually recently, a certain asynchronous machine is wherein carried out the control of slip frequency, make it to be operated in generating state and change the size of generator torque, thereby reach the purpose that fictitious load changes by changing revolutional slip.Though above two kinds of schemes all can satisfy various testing requirementss, the pilot system complexity, wayward, reliability and security are lower, and cost is also bigger.
Summary of the invention
The purpose of this utility model is to overcome the problem of the deficiencies in the prior art and existence, a kind of low energy consumption, safety, Simple and Reliable high voltage converter load test device are proposed, the test frequency converter is in allowing voltage range, ability by the rated current operation, make and need not motor in the process of the test, will make device simplify and reduce cost greatly like this.
Basic ideas are by means of reactive current generating device, set up a kind of current testing device of frequency converter low energy consumption.Its technical scheme is: power distribution network bus 1 is connected frequency converters 3 through isolating transformer 2, again with bus 1 and connect, be connected voltage transformer (VT) 5, current transformer 6 between frequency converter 3 and resistance sense load 4 after the inverter output terminal series connection resistance sense load 4; Regulate the amplitude and the phase place of frequency converter output voltage, size and Orientation with control of conversion device output current, in order to find line voltage and unit output voltage phase place control signal of the same size fast, detect the voltage of resistance in the resistance sense load, find out its minimum value, output this moment is consistent with input AC size and phase place; Close a floodgate, the PLC (programmable logic controller (PLC)) in the frequency converter 3 is sent in the pressure drop that voltage transformer (VT) 5 detects resistance, the output pulse that changes PLC simultaneously is to adjust the output phase angle, the signal value minimum that measures up to voltage sensor, change the amplitude of modulation signal then, constantly detect resistance drop simultaneously up to the signal minimum that finds voltage sensor to measure once more, this moment frequency converter 3 the output voltage size, phase place with exchange the input basically identical, then by changing PLC output pulse or modulation signal, the control system electric current, thereby finish the test of the operation conditions of different electric current operating modes unit, system power is detected by current transformer 6 and sends into PLC and monitor.
Close a floodgate moment by load current-limiting resistance current limliting, combined floodgate preceding switch K1, K2, K3, K4, K5, K6 are off-state, the combined floodgate start-up course is opened for closing sky--and close K6--and close K1--and close K3--and K2--and close K5--and close K4, when normal operation, whether need disconnect K3 and in actual moving process, test definite.
Output current, voltage are detected and are exported pulse adjustment output phase angle and carries out different current conditions and full load conditions test with the electric current of regulating by IGBT (insulated gate bipolar transistor) by PLC, in order to guarantee not overvoltage of cell voltage, power cell should be adjusted into inductive load, output phase angular advance input phase angle makes power flow to mains side by cell side
Detect to finish the back uninstall process and be the disconnected K5 of the disconnected K3--of the disconnected K4--of the disconnected K2--of the disconnected K1--of disconnected K6--.
For safety test, the size that line voltage and frequency converter output voltage phase angle are looked the resistance sense load is selected in about 0 degree.
The utility model has proposed a kind of brand-new high voltage converter test unit by reactive current generating device, the ability that the effective test frequency converter of energy moves by rated current in allowing voltage range, this device is broken away from the constraint of traditional experiment device, has the following advantages and good effect:
(1), in process of the test, need not motor by reactive current generating device;
(2) divide two steps with the high voltage converter test, make control simpler and easy;
(3) pilot system is simple, reliability, security, practicality height;
(4) the meritorious consumption of entire test has only the loss of frequency converter and the consumption of load current-limiting resistance, so energy consumption is low.
Description of drawings
Fig. 1 is the test principle figure of the annexation of the utility model high-pressure frequency variator low energy-consumption load testing system and network system bus;
Fig. 2 is when considering single test, specific embodiments figure of the present utility model;
Fig. 3 is an IGBT drive signal generating principle block diagram;
Fig. 4 is the isoboles of the utility model test principle figure.
Embodiment
Below in conjunction with accompanying drawing and unit embodiment principle of work of the present utility model is described further.
Shown in Fig. 1 test principle figure of the present utility model, reach figure.Power distribution network bus 1 is through isolating transformer 2, connect frequency converter 3, after its output terminal series connection resistance sense load 4 again with bus 1 and connect, in order to find line voltage and unit output voltage phase place control signal of the same size fast, can determine by the voltage that detects resistance in the resistance sense load, because when output voltage size in unit is consistent with the input ac voltage sized phases with phase place, the meritorious consumption of system is 0 in theory, then resistance drop also should be 0 in theory, but owing to there is the frequency converter loss, resistance drop should be one and approach 0 value, in fact finds out its minimum value and illustrates that promptly output is consistent with input AC size and phase place.The PLC in the frequency converter 3 is sent in the pressure drop that the back voltage transformer (VT) 5 that closes a floodgate detects resistance, the output pulse that changes PLC simultaneously is to adjust the output phase angle, the signal value minimum that measures up to voltage transformer (VT), change the amplitude of modulation signal then, constantly detect resistance drop simultaneously up to the signal minimum that finds voltage sensor to measure once more, this moment the unit the output voltage size, phase place with exchange the input basically identical, get final product the control system electric current by changing PLC output pulse or modulation signal then, thereby finish the test of the operation conditions of different electric current operating modes unit, system power is detected by current transformer 6 and sends into PLC and monitor.
As shown in Figure 4, with high voltage converter one unit ac output end through resistance sense load series connection back and ac input end and connect, this moment, the frequency converter unit output voltage can be regarded a controllable voltage source (output voltage amplitude and phase place are all controlled) as, pilot system is this controllable voltage source Ua and connects with electric network source Ub and be connected into the loop after the resistance sense load, and L is the inductance of air reactor among Fig. 4.System A (8 among Fig. 4) send meritorious and perception idle, load and the B of system (9 among Fig. 4) absorb meritorious and perception idle, system A absorb meritorious and perception idle, and the B of system sends meritorious and perception is idle.
As long as suitably regulate the amplitude and the phase place of frequency converter output voltage, size and Orientation that promptly can control of conversion device output current.When the high voltage converter absorption was meritorious, the inverter direct-flow side capacitance voltage raise; When high voltage converter output was meritorious, the inverter direct-flow side capacitance voltage descended; The rising of capacitance voltage or reduction will be regulated the active current size, up to power supply output the loss of function compensating load equivalent resistance be arranged, and reach equilibrium state.Therefore, the resistive component of power supply output is the loss of complementation test system, can reach the low energy consumption test objective like this.
When considering single test shown in the specific embodiments figure as Fig. 2.Load is closed a floodgate moment because system is in transient state process, the dash current that flows through IGBT may be very big, for safety test, close a floodgate moment by load current-limiting resistance current limliting, and the combined floodgate start-up course is closed sky for (state is that K1, K2, K3, K4, K5, K6 are off-state before closing a floodgate) and is opened--close K6--and close K1--and close K3--and K2--and close K5--close K4 (whether need disconnect K3 when normal operation test definite) in actual moving process.2.1 and 2.2 be transformer, 7 is current-limiting resistance, and 4.1 is the load current-limiting resistance, and 4.2 is air reactor.After test was finished, uninstall process was the disconnected K5 of the disconnected K3--of the disconnected K4--of the disconnected K2--of the disconnected K1--of disconnected K6--.
Show as Fig. 1, described device comprises isolating transformer 2, resistance sense load 4, voltage transformer (VT) 5 summation current transformers 6, the input end of isolating transformer is connected with power distribution network bus 1, output terminal links to each other with the ac input end of tested high voltage converter 3, and resistance sense load 4 series connection high voltage converters 3 backs are with power distribution network bus 1 and connect the formation loop; Between high voltage converter 3 and resistance sense load 4, be connected to voltage transformer (VT) 5 summation current transformers 6 that are used to detect resistance sense load pressure drop and electric current.
Physical circuit type of attachment such as Fig. 2 show.Isolating transformer 2 comprises step-down transformer 2.1 and step-up transformer 2.2, and the two serial connection is provided with K switch 6 at power distribution network bus 1 and 2.1 of step-down transformers, is provided with K switch 1 between step-down transformer and the step-up transformer; The output terminal of K switch 1 is connected to K switch 5, and K5 connects with load current-limiting resistance 4.1 and air reactor 4.2, and the other end of air reactor 4.2 links to each other with the ac output end of high voltage converter 3, is parallel with K switch 4 on the load current-limiting resistance 4.1; The output terminal of K switch 1 also links to each other with the input end of step-up transformer 2.2 simultaneously, is connected to current-limiting resistance 7 on the output terminal of step-up transformer, and K switch 7 is connected with K switch 3 with resistance 7 backs in parallel, and the output terminal of K switch 3 links to each other with the input end of high voltage converter 3.
Shown in Fig. 3 IGBT drive signal generating principle block diagram.Clock module 3.1 provides required clock signal for each module of FPGA (field programmable gate array).PLC module 3.2 functions: a) to phase place, voltage increase and decrease pulse and phase place, voltage increase and decrease direction signal sampling filtering; B), comprise the leading or counting that lags behind after counting before the phase place reset, the phase place reset to phase place, potential pulse counting; C) current phase place and the magnitude of voltage of feedback.Phase shift block 3.3 is specified the phase shift size according to the fundamental signal and the PLC of electrical network sampling, and mobile baseband signal goes to trigger band carrier wave shape module then.Band carrier wave shape module 3.4 generates the pulse waveform of cycle and synchronized according to the phase shift fundamental signal.Debugging waveform module 3.5 generates and drives direct currents debugging and the pressure regulator required waveform that powers on that powers on.3.6 for control signal output, drive the IGBT in the test unit major loop 3.7, major loop 3.7 topological structures are single-phase full bridge voltage-type inverter bridge.
Embodiment of the present utility model, for power is 2000kW, electric pressure is the variator low energy-consumption load testing system of a certain unit of high voltage converter of 6kV.
1 is the input electrical network, and voltage is 380VAC, 50Hz, 2.1 be that 380/220 step-down becomes, 2.2 is 220/380 change of boosting, capacity is 50KVA, 7 are 200 ohm of employings, the unit current-limiting resistance of 600W, and 4.1 for adopting 50 ohm, the load current-limiting resistance of 2KW, 4.2 be air reactor, 5mH, band 1mH, 2mH, the static tap of 3mH.The DC voltage Hall element detects the pressure drop of load current-limiting resistance, input PLC, PLC is by constantly changing output pulse and modulation signal amplitude adjustment unit output phase angle and output voltage size, up to the minimum value that finds the pressure drop of load current-limiting resistance, thereby adjust control signal then gradually and realize the test of different electric current operating modes to change unit output voltage and input ac voltage phase differential, the electric current PLC that makes a gift to someone after the current Hall sensor monitors.System clock input (CLK) is 20MHZ; The output of TESTCLK (clock module pin) frequency-dividing clock, frequency 480KHz is used for the debugging module waveform and generates; The output of PHASECLK (clock module pin) frequency-dividing clock, frequency 120KHz is used for band and carries the generation of module waveform.
Claims (2)
1. novel high-pressure frequency variator low energy-consumption load testing device, it is characterized in that: described device comprises isolating transformer (2), resistance sense load (4), voltage transformer (VT) (5) summation current transformer (6), the input end of isolating transformer is connected with power distribution network bus (1), output terminal links to each other with the ac input end of tested high voltage converter (3), and resistance sense load (4) series connection high voltage converter (3) back is with power distribution network bus (1) and connect the formation loop; Between high voltage converter (3) and resistance sense load (4), be connected to voltage transformer (VT) (5) summation current transformer (6) that is used to detect resistance sense load pressure drop and electric current.
2. a kind of novel high-pressure frequency variator low energy-consumption load testing device as claimed in claim 1, it is characterized in that: described isolating transformer (2) comprises step-down transformer (2.1) and step-up transformer (2.2), the two serial connection, between power distribution network bus (1) and step-down transformer (2.1), be provided with K switch 6, be provided with K switch 1 between step-down transformer and the step-up transformer; The output terminal of K switch 1 is connected to K switch 5, K5 connects with load current-limiting resistance (4.1) and air reactor (4.2), the other end of air reactor (4.2) links to each other with the ac output end of high voltage converter (3), and the load current-limiting resistance is parallel with K switch 4 on (4.1); The output terminal of K switch 1 also links to each other with the input end of step-up transformer (2.2) simultaneously, be connected to current-limiting resistance (7) on the output terminal of step-up transformer, K switch 7 is connected with K switch 3 with resistance (7) back in parallel, and the output terminal of K switch 3 links to each other with the input end of high voltage converter (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520099281 CN2879212Y (en) | 2005-12-09 | 2005-12-09 | New high-voltage transducer low energy consuming load testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520099281 CN2879212Y (en) | 2005-12-09 | 2005-12-09 | New high-voltage transducer low energy consuming load testing device |
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| CN2879212Y true CN2879212Y (en) | 2007-03-14 |
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| CN 200520099281 Expired - Lifetime CN2879212Y (en) | 2005-12-09 | 2005-12-09 | New high-voltage transducer low energy consuming load testing device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012129844A1 (en) * | 2011-03-29 | 2012-10-04 | 上海雷诺尔科技股份有限公司 | Intelligent synthesis system for developing and testing high-voltage frequency converter and establishment method thereof |
| CN106597173A (en) * | 2016-12-29 | 2017-04-26 | 北京动力源科技股份有限公司 | Micropower loss testing method, apparatus and system during the full load of high voltage frequency converter |
| CN108646113A (en) * | 2018-06-06 | 2018-10-12 | 广东明阳龙源电力电子有限公司 | A kind of high-pressure transducer testing system |
| CN109116128A (en) * | 2017-06-26 | 2019-01-01 | 株洲变流技术国家工程研究中心有限公司 | A kind of frequency converter total power certification test method and device |
-
2005
- 2005-12-09 CN CN 200520099281 patent/CN2879212Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012129844A1 (en) * | 2011-03-29 | 2012-10-04 | 上海雷诺尔科技股份有限公司 | Intelligent synthesis system for developing and testing high-voltage frequency converter and establishment method thereof |
| CN106597173A (en) * | 2016-12-29 | 2017-04-26 | 北京动力源科技股份有限公司 | Micropower loss testing method, apparatus and system during the full load of high voltage frequency converter |
| CN109116128A (en) * | 2017-06-26 | 2019-01-01 | 株洲变流技术国家工程研究中心有限公司 | A kind of frequency converter total power certification test method and device |
| CN108646113A (en) * | 2018-06-06 | 2018-10-12 | 广东明阳龙源电力电子有限公司 | A kind of high-pressure transducer testing system |
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Granted publication date: 20070314 |
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