CN201985816U - High-power three-level and four-quadrant explosion-proof variable frequency device - Google Patents
High-power three-level and four-quadrant explosion-proof variable frequency device Download PDFInfo
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- CN201985816U CN201985816U CN2011201361564U CN201120136156U CN201985816U CN 201985816 U CN201985816 U CN 201985816U CN 2011201361564 U CN2011201361564 U CN 2011201361564U CN 201120136156 U CN201120136156 U CN 201120136156U CN 201985816 U CN201985816 U CN 201985816U
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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
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Abstract
The utility model discloses a high-power three-level and four-quadrant explosion-proof variable frequency device, and belongs to an explosion-proof variable frequency device for controlling an asynchronous motor. A three-phase AC power supply of the variable frequency device is connected with a three-phase reactor via a three-phase transformer, wherein the secondary side of the three-phase reactor is connected with a rectifier, so as to provide three-phase power needed by the variable frequency device; the rectifier is connected with the input end of an inverter, and the output end of the inverter is connected with an asynchronous squirrel cage motor; the voltage detection ends, the current detection ends, and the temperature detection ends of the rectifier and the inverter, as well as the control output end are respectively connected with the control input end of a control system; and rectification pulse and inversion pulse at the control output end of the control system are respectively connected with the control input ends of the rectifier and the inverter. The explosion-proof variable frequency device provided by the utility model can control the three-phase squirrel cage asynchronous motor under severe environments, the control electromagnetic noise is small, the dynamic and the static properties are favorable, the switch frequency is low, the consumption is low, and the efficiency is high.
Description
Technical field
The present invention relates to a kind of flame-proof converter device of controlling asynchronous motor, particularly a kind of high-power three level four-quadrant flame-proof converter devices.
Background technology
Frequency converter is that the Electric Drive application has brought low-loss, high performance characteristics, but has the characteristics of high gas, high humility under the coal mine, and universal frequency converter can not use in the down-hole.In recent years, developed multiple middle low power mine anti-explosion frequency converter both at home and abroad, but power is not seen above 500kW.
The domestic active front end rectification unit of the wide modulation of dai channel (PWM) rectification that still can not provide draws sine wave AC from electrical network at present, output dc voltage after rectification, and keep the explosion-proof frequency converter of desired magnitude of voltage (AFE), rectification unit adopts diode not control rectifier system, harmonic wave is bigger, and power factor is not high, does not have feedback unit, adopt the dynamic braking mode, efficient is low; The research of medium voltage frequency converter inversion unit concentrates on the two level topologys or the unit phase shift series system of power device series connection.The explosion-proof frequency converter that overseas enterprise can provide rectification and inversion all to adopt the PWM mode is not seen the dual three-level infrastructure product as yet.
Summary of the invention
The utility model purpose is that a kind of high-power three level four-quadrant flame-proof converter devices will be provided, and solves the explosion-proof frequency converter that frequency converter can not provide the active front end of band PWM rectification, and harmonic wave is big, power factor is low and inefficient problem.
The purpose of this utility model is achieved in that the three-phase alternating-current supply of this converter plant is connected with three-phase reactor by three-phase transformer, and the secondary side of three-phase reactor is connected with rectifier, and the three phase mains that needs is provided to converter plant; The input of rectifier and inverter is connected, and inverter output end is connected with asynchronous mouse cage machine; Rectifier voltage detects, rectifier current detects and rectifier temperature detection and contravarianter voltage detection, inverter current detection and inverter temperature detection, and the control output end all is connected with the control input end of control system.The commutating pulse of the control output end of control system is connected with the control input end of rectifier and inverter respectively with the inversion pulse.
Described rectifier is identical on the major loop topological structure with inverter, all adopts diode clamping formula three level bridge circuits; Each brachium pontis is selected the power device of two series connection for use, and power device is insulated gate transistor IGBT; Each insulated gate transistor IGBT carries fly-wheel diode; String has two catching diodes between the junction of the junction of first power device and second power device and the 3rd power device and the 4th power device, links to each other with the zero bus of dc bus between two catching diodes; In rectifier, be power input between second power device and the 3rd power device, each group connects one and imports power supply mutually; In inverter, be power output end between second power device and the 3rd power device, each group is a phase out-put supply.
Beneficial effect, owing to adopted such scheme, adopt the ac-dc-ac inverter mode, major loop adopts " back of the body-lean on-back of the body (back-back) " dual three-level topological structure, rectifier and inverter all adopt space vector of voltage (SVPWM) technology, also claim the magnetic linkage track method.Need not increase any adjunct circuit and just can realize of the feedback of frequency converter regenerated energy, realize the energy two-way flow to electrical network.Do not need to increase any filter and just can satisfy the instructions for use of country, and installed capacity can reach 1.5MW the frequency conversion equipment regulation.
Satisfy alternating current asynchronous squirrel-cage motor speed governing requirement, and motor is not had specific (special) requirements, particularly require occasion high, that dynamic response requirement is fast especially suitable for adjusting speed accuracy.The device output waveform is superior in quality, need not to increase any filter and just can make harmonic content far below national standard.Because PWM rectifier closed-loop control effect, add and use increasing substantially of self-turn-off device and switching frequency, making the electric current of feed-in electrical network is and the opposite sine wave of electrical network phase voltage phase place that the power factor of system approximates 1, has eliminated the harmonic pollution of converter plant to electrical network.Simultaneously,, make the loss of whole system no any energy except that load acting and converter plant device loss, meet the planning requirement of national energy-saving and emission-reduction fully because the introducing of the active front end of AFE can realize energy from the two-way flow between motor and the electrical network.Break through the little bottleneck of two level converter power, realized the high-power mine anti-explosion Inverter Application of 500kW-1500kW.Solved frequency converter the explosion-proof frequency converter of being with the active front end of PWM rectification can not be provided, and harmonic wave is big, power factor is low and inefficient problem, has reached the purpose of this utility model.
Advantage: adopt optimal design, meet the requirement of explosion proof of national regulation, can adapt under the various adverse circumstances, can satisfy the high AC speed regulating occasion of various dynamic response requirement to the operating mode specific demand of converter plant at certain explosion hazard area.
Adopt vector control, system has the Fast Dynamic performance, can satisfy various torque-demands, and speed governing is level and smooth and do not have a torque pulsation.
Adopt three level major loop topological structures, produce 3 rank output voltages, the total percent harmonic distortion of electric current is low, and electromagnetic noise is little, and dynamic and static state performance is good.And switching frequency is low, loss is little, efficient is high.
Employing not only can realize active four quadrant running truly based on the feedforward decoupling zero active front end of control algolithm PWM (AFE), also makes harmonic content reach minimum.
Online parameter of electric machine identification and adaptive control make control system have very high robustness, use the influence that is not subjected to occasion and environment.
The Speedless sensor The Application of Technology more makes system simplify greatly, solved because velocity transducer is installed the problem that improper or precision influences systematic function inadequately.
The type of cooling adopts the higher heat-pipe radiator of thermal conductivity coefficient, good looking appearance not only, and satisfy instructions for use under the various adverse circumstances fully.
Use the power laminated bus of a kind of modern, easy Fast Installation and clear in structure, be used for the connection of power supply, electric capacity, power device etc., realized a kind of highway of power division.
Description of drawings
Fig. 1 three level explosion-proof frequency converter system construction drawings of the present utility model.
The rectifier of Fig. 2 dual three-level converter of the present utility model and the structure chart of inverter.
Among the figure: 1, three-phase alternating-current supply; 2, three-phase transformer; 3, three-phase reactor; 4, rectifier; 5, inverter; 6, asynchronous mouse cage machine; 7, rectifier voltage detects; 8, rectifier current detects; 9, rectifier temperature detection; 10, contravarianter voltage detects; 11, inverter current detects; 12, inverter temperature detection; 13, commutating pulse; 14, inversion pulse; 15, control system.
Embodiment
Embodiment 1: the three-phase alternating-current supply 1 of this converter plant is connected with three-phase reactor 3 by three-phase transformer 2, and the secondary side of three-phase reactor 3 is connected with rectifier 4, and the three phase mains that needs is provided to converter plant.Rectifier 4 is connected with the input of inverter 5, and inverter 5 outputs are connected with asynchronous mouse cage machine 6; Rectifier voltage detection 7, rectifier current detection 8 and rectifier temperature detection 9 and contravarianter voltage detection 10, inverter current detection 11 and inverter temperature detection 12, the control output end all is connected with the control input end of control system 15.The commutating pulse 13 of the control output end of control system 15 is connected with the control input end of rectifier and inverter respectively with inversion pulse 14.
Described rectifier 4 is identical on the major loop topological structure with inverter 5, all adopts diode clamping formula three level bridge circuits; Each brachium pontis is selected the power device of two series connection for use, and power device is insulated gate transistor IGBT; Each insulated gate transistor IGBT carries fly-wheel diode; String has two catching diodes between the junction of the junction of first power device and second power device and the 3rd power device and the 4th power device, links to each other with the zero bus of dc bus between two catching diodes; In rectifier, be power input between second power device and the 3rd power device, each group connects one and imports power supply mutually; In inverter, be power output end between second power device and the 3rd power device, each group is a phase out-put supply.
The high-power three level flame-proof converter devices of the present invention are made up of major loop, transducer and control system: three-phase alternating-current supply 1, three-phase transformer 2, three-phase reactor 3, rectifier 4, inverter 5, asynchronous mouse cage machine 6, rectifier voltage detection 7, rectifier current detection 8, rectifier temperature detection 9, contravarianter voltage detection 10, inverter current detection 11, inverter temperature detection 12, commutating pulse 13, inversion pulse 14, control system 15.
Aspect major loop: three-phase alternating-current supply 1 is connected with three-phase transformer 2, the electrical network high pressure is become corresponding voltage, be connected with three-phase reactor 3 then, the secondary side of three-phase reactor 3 is connected with rectifier 4, and the three phase mains that needs is provided to converter plant.The dc bus of rectifier 4 and inverter 5 (+,-, 0) is connected, and inverter 5 output three-phase amplitudes, frequency, phase place all adjustable voltage are connected with asynchronous mouse cage machine 6.
Control section: the rectifier voltage detection 7, rectifier current detection 8 and the rectifier temperature detection 9 that are respectively rectifier, with the form of voltage output to control system 15, contravarianter voltage detection 10, inverter current detection 11 and inverter temperature detection 12 output to control system 15 in the same way.Control system 15 provides trigger impulse for rectifier and inverter by commutating pulse 13 and inversion pulse 14 respectively when detecting the frequency converter desired signal.
Control system adopts High Performance DSP as master cpu, and forms intelligent optical fiber in conjunction with CPLD and trigger.For guaranteeing the rapidity of system dynamics response, adopt vector control mode, and, single DSP three level SVPWM control modes of high integration have been realized based on 3 level space vector pulse-width modulation (SVPWM) algorithm of optimizing with make full use of on the basis of Digital Signal Processing DSP resource.Active front end aspect has adopted the virtual electrical network flux observer of the cascade low pass filter able to programme with accurate initial value of suitable high-power applications occasion, effectively raises the anti-load disturbance of control system and the ability of grid disturbance.Control system has also adopted under the three level topological structures based on the online identifying approach of the parameter of electric machine of special incentive and immune algorithm, and utilizes the full rank closed loop flux observer that has the phase compensation function, has realized the Speedless sensor control of asynchronous mouse cage machine.
According to the flow direction of energy, dual three-level magnetic linkage track method SVPWM Alternating Current Governor System running status can be divided into two kinds:
(1) energy flows to motor load by the three-phase alternating current electrical network
When motor is in when dragging running status, energy flows to inverter by the rectifier of AC network in system.At this moment, rectifier is operated under the rectification state, uses magnetic linkage track method SVPWM mode to control the electric current and the electrical network phase voltage same-phase of AC network side, realizes the unity power factor rectification; Inverter is operated under the inverter mode, and the converter bridge switching parts pipe is under magnetic linkage track method SVPWM control, and the sine voltage signal of output frequency and adjustable amplitude value is realized the frequency control of alternating current machine.
(2) motor regenerated energy feed-in three-phase alternating current electrical network
In Control of Frequency Control Process, when motor is in when running slowly, because the load effect of inertia enters generating state.At this moment, inverter is operated under the rectification state, the regenerated energy of alternating current motor charges to the storage capacitor of intermediate dc link via switch element in the inverter and fly-wheel diode, capacitor voltage at both ends is raise: rectifier is operated under the active inversion state, its switch element is under PWM control, in energy feed-in AC network, finish the two-way flow of energy.
Claims (2)
1. high-power three level four-quadrant flame-proof converter devices, it is characterized in that: the three-phase alternating-current supply of this converter plant (1) is connected with three-phase reactor (3) by three-phase transformer (2), the secondary side of three-phase reactor (3) is connected with rectifier (4), and the three phase mains that needs is provided to converter plant; Rectifier (4) is connected with the input of inverter (5), and inverter (5) output is connected with asynchronous mouse cage machine (6); Rectifier voltage detects (7), rectifier current detects (8) and rectifier temperature detection (9) and contravarianter voltage and detects (10), inverter current detection (11) and inverter temperature detection (12), and the control output end all is connected with the control input end of control system (15); The commutating pulse (13) of the control output end of control system (15) is connected with the control input end of rectifier and inverter respectively with inversion pulse (14).
2. according to a kind of high-power three level four-quadrant flame-proof converter devices described in the claim 1, it is characterized in that: described rectifier (4) is identical on the major loop topological structure with inverter (5), all adopts diode clamping formula three level bridge circuits; Each brachium pontis is selected the power device of two series connection for use, and power device is insulated gate transistor IGBT; Each insulated gate transistor IGBT carries fly-wheel diode; String has two catching diodes between the junction of the junction of first power device and second power device and the 3rd power device and the 4th power device, links to each other with the zero bus of dc bus between two catching diodes; In rectifier, be power input between second power device and the 3rd power device, each group connects one and imports power supply mutually; In inverter, be power output end between second power device and the 3rd power device, each group is a phase out-put supply.
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| CN2011201361564U CN201985816U (en) | 2011-05-03 | 2011-05-03 | High-power three-level and four-quadrant explosion-proof variable frequency device |
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| CN2011201361564U CN201985816U (en) | 2011-05-03 | 2011-05-03 | High-power three-level and four-quadrant explosion-proof variable frequency device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684599A (en) * | 2012-05-07 | 2012-09-19 | 徐州中矿大传动与自动化有限公司 | Mine anti-explosion frequency conversion device with low switching frequency |
| CN102778624A (en) * | 2012-07-30 | 2012-11-14 | 北京合康亿盛变频科技股份有限公司 | Device and method for verifying power unit design of cascaded high-voltage frequency converter |
| CN102891472A (en) * | 2012-08-23 | 2013-01-23 | 徐州云泰汽车电器有限公司 | Remote monitoring rectifier |
| CN105047837A (en) * | 2015-06-24 | 2015-11-11 | 中航光电科技股份有限公司 | Battery holder |
| CN105720797A (en) * | 2016-05-03 | 2016-06-29 | 北京森源东标电气有限公司 | High voltage cascading four-quadrant frequency converter unit controller |
| CN113708647A (en) * | 2021-08-30 | 2021-11-26 | 西安铁路职业技术学院 | Frequency conversion-power frequency combined driving system for large and medium-sized equipment |
| CN117978017A (en) * | 2023-12-28 | 2024-05-03 | 北方工业大学 | Discretization method of flux observer for induction motor suitable for low carrier ratio operation |
-
2011
- 2011-05-03 CN CN2011201361564U patent/CN201985816U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684599A (en) * | 2012-05-07 | 2012-09-19 | 徐州中矿大传动与自动化有限公司 | Mine anti-explosion frequency conversion device with low switching frequency |
| CN102778624A (en) * | 2012-07-30 | 2012-11-14 | 北京合康亿盛变频科技股份有限公司 | Device and method for verifying power unit design of cascaded high-voltage frequency converter |
| CN102891472A (en) * | 2012-08-23 | 2013-01-23 | 徐州云泰汽车电器有限公司 | Remote monitoring rectifier |
| CN105047837A (en) * | 2015-06-24 | 2015-11-11 | 中航光电科技股份有限公司 | Battery holder |
| CN105720797A (en) * | 2016-05-03 | 2016-06-29 | 北京森源东标电气有限公司 | High voltage cascading four-quadrant frequency converter unit controller |
| CN113708647A (en) * | 2021-08-30 | 2021-11-26 | 西安铁路职业技术学院 | Frequency conversion-power frequency combined driving system for large and medium-sized equipment |
| CN117978017A (en) * | 2023-12-28 | 2024-05-03 | 北方工业大学 | Discretization method of flux observer for induction motor suitable for low carrier ratio operation |
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