CN100449923C - Frequency transformer capable of continuously operating during power-off - Google Patents
Frequency transformer capable of continuously operating during power-off Download PDFInfo
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- CN100449923C CN100449923C CNB2006100102759A CN200610010275A CN100449923C CN 100449923 C CN100449923 C CN 100449923C CN B2006100102759 A CNB2006100102759 A CN B2006100102759A CN 200610010275 A CN200610010275 A CN 200610010275A CN 100449923 C CN100449923 C CN 100449923C
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
This invention provides a frequency converter continuing operation when losing power including a voltage source high voltage converter structure with multiple level units in series, in which, its main circuit structure is composed of a phase-shift transformer and a power unit, the high voltage supply is switched into the primary winding of the phase-shift transformer, 18 mutual independent windings are set at the side of the transformer and connect with 18 power units, a UPS is connected in the control supplying circuit, a multi-phase isolated control transformer is after the UPS and switched into the power unit control circuit of the converter and a power-losing test relay is set between the high voltage supply of the main circuit and the primary winding of the phase-shift transformer.
Description
(1) technical field
What the present invention relates to is a kind of electric device, specifically a kind of high voltage converter of energy stable operation when fluctuation appears in electrical network.
(2) background technology
When going wrong, carrying out reclosing, mutual switching at high voltage power supply, because the dead electricity interval about 0.1 second～1.5 seconds all can appear in factors such as the arc extinguishing of high-voltage fence, demagnetization.Blower fan etc. loads is because the flywheel energy support of self, and rotation speed change is little, the condition that motor is possessed directly power up.So the high-tension switch of big capacity high motor all remains on closing position when the high-pressure system instant electricity loss, when power up, because motor speed is still very high, impulse current was very little when motor powered on, power network fluctuation can be do not caused, the continuous operation of system can be kept.
Frequency converter can not be kept continuous operation when instantaneous dead electricity, thereby the high-pressure system that is provided with frequency converter is out of service not only can cause high-voltage motor instantaneous dead electricity to occur the time, and inconsistent with former technological requirement.In the large scale system that the time of a service area of needs internally-powered part can not stop, can't using frequency converter so.And domestic energy-saving potential the best part just is included in wherein, thus when the large-size machine of legacy system carried out frequency conversion and transforms, will changes persuing frequently utensil instantaneous dead electricity is arranged and the function that can move continuously.
At present, high voltage converter is when the high pressure dead electricity, and the electric weight of an only inner capacitance stores is kept, and when the dead electricity time surpasses time interval more than the 100mS, does not have a kind of method to solve high voltage converter and keeps moving continuously under high pressure dead electricity situation.
(3) summary of the invention
It is a kind of when dead electricity appears in short-term in the high voltage supply net that the object of the invention is to provide, and utilizes flywheel energy in the rotary system to keep the high-voltage high-power frequency transformator of continuous service.
The object of the present invention is achieved like this: it comprises multilevel unit-in-series voltage-source type high voltage converter structure, its major loop structure is made of phase shifting transformer and power cell, high voltage source inserts the phase shifting transformer main winding, at the phase shifting transformer secondary 18 separate windings are arranged, winding connects 18 power cells respectively; The power cell inner member consists of: each unit is by rectification input diode bridge, storage capacitor, H bridge shape output copped wave IGBT connects to form, in the control current supply circuit, also be connected with UPS, connect heterogeneous isolated controlling transformer behind UPS, heterogeneous isolated controlling transformer inserts the power cell control loop of frequency converter; Between the high voltage source of major loop and phase shifting transformer main winding, be provided with dead electricity and detect relay.
The present invention can also comprise following architectural features:
1, described UPS is that power is the uninterrupted power supply of 1.5kW.
2, described isolated controlling transformer is exported 18 independently 600V for input 220V, isolates fully between each output, and voltage withstand class is the isolated controlling transformer of 10kV.
3, described dead electricity detects relay, is common 380V voltage detecting relay.
The present invention adds UPS in the control current supply circuit, add heterogeneous isolated controlling transformer behind UPS.The power cell control loop power supply of frequency converter is independent.Add dead electricity at major loop and detect relay, when occurring frequency converter in operation, high-voltage switch gear is in normal condition, and dead electricity detection relay sends signal, then is defined as the high voltage supply net and dead electricity in short-term occurs.Electrical network in short-term the dead electricity signal arrive among the frequency converter DSP, then start corresponding control programs, with the state of frequency converter by being to utilize kinetic energy the rotary system to keep frequency converter to move continuously from the electrical network absorbed power to load transition.When high-voltage fence recovers just often, the DSP program change back frequency converter from the electrical network absorbed power to the normal condition of loading from keeping the frequency converter operation.
The present invention can guarantee in the huge revolving system that drags with frequency converter, switches mutually when the high-voltage fence appearance, and instantaneous reclosing during faults such as transient earthing, has the state of dead electricity in short-term in the frequency converter high voltage source, still can keep the stable operation of frequency converter.Can make the stability and the fail safe of large scale system improve a grade, the instability that reduces owing to electrical network causes the system crash phenomenon.
(4) description of drawings
Fig. 1 is frequency converter main structure figure.
Fig. 2 is the frequency converter unit cut-away view.
Fig. 3 be among the present invention when occur high-voltage fence in short-term dead electricity advance frequency converter frequency and regulate flow chart.
Fig. 4 is the frequency converter framework program diagram that advances of dead electricity in short-term among the present invention.
Fig. 5 is principle of the invention figure.
(5) embodiment
For a more detailed description to the utility model for example below in conjunction with accompanying drawing:
In conjunction with Fig. 1, its primary heat transport system structure comprises:
● constitute major loop by phase shifting transformer and power cell.
● the major loop mode of connection:
High voltage source is at first supplied with the phase shifting transformer main winding, at the phase shifting transformer secondary 18 separate windings are arranged, it presses the winding of extend-triangle, realize the group of the phase shift of each 10 degree, be used for giving respectively 18 power cell power supplies, 18 according to group composition A, B, three groups of C, series connection becomes the adjustable sine wave of Y-connection frame mode output frequency, supplies with the high-tension motor operation and uses with speed governing.
In conjunction with Fig. 2, the power cell structure in the multilevel unit-in-series voltage-source type frequency converter comprises:
● the power cell inner member is formed:
● each unit is equivalent to a small-power low voltage frequency converter, by rectification input diode bridge, and storage capacitor, H bridge shape output copped wave IGBT forms, and its schematic diagram is an accompanying drawing 2: state during power cell work:
Three-phase alternating-current supply is by after the rectifier diode bridge carries out rectification in the power cell, and with its input capacitance array, capacitor array carries out filtering to the direct current of pulsation, makes it become constant DC.Capacitor array offers stable voltage of output loop and pulsation drive current simultaneously as the voltage energy relaying pond of PWM output.H bridge shape IGBT loop is converted to the output of PWM waveform voltage with the direct voltage of capacitor array.
In conjunction with Fig. 3-Fig. 4, multilevel unit-in-series voltage-source type frequency converter dead electricity of the present invention is the technical essential of operation continuously:
● at first solve when dead electricity, the power supply of master control borad is supplied with in the power cell.
● multilevel unit-in-series voltage-source type frequency converter belongs to the mode transducer of AC-DC-AC type, determine it to be divided into the input unsteady flow by its topological structure, the energy storage voltage stabilizing, three partial structure are imported in conversion, when the frequency converter dead electricity, the energy storage voltage stabilizing is only arranged, and the conversion export structure is in operation, so corresponding setting adjustment is made in the requirement of each value of operation in detecting unit.
● solve frequency conversion when dead electricity, power cell capacitor array voltage stable.Keep its voltage fluctuation at rated value 75% with interior fluctuation.
● solve when the frequency converter dead electricity energy loss of major loop element.By tight logic analysis, accurate calculating, the PWM waveform output change with the H bridge makes motor run on the state of energy feedback, make the controlled electric energy that is converted to capacitor array of flywheel energy in the rotor loop, replenish the consumption of major loop element and stablizing of capacitor array voltage.
The behavior model that electric system rotor loop flywheel energy utilizes is described:
(1) frequency converter dead electricity rear motor rotor flywheel energy is converted into the principle of electric energy:
● the asynchronous machine operation logic:
Asynchronous machine is divided into stator and rotor, after stator winding adds alternating current, just forms a ring rotation magnetic field on stator.The rotor winding goes out rotor current by electromagnetic induction, and forms corresponding rotor rotating magnetic field.The stator rotating magnetic field is different relatively with the speed of rotor rotating magnetic field, will determine motor to be in asynchronous motor operating state or asynchronous renewable hair motor operating state.
● motor is in the asynchronous motor operating state:
When the speed of the stator rotating magnetic field of motor during faster than rotor rotating magnetic field speed, motor is converted into the mechanical energy output of rotor with the electric energy of stator winding, and this moment, motor promptly was in the motor operating state.
● motor is in regeneration asynchronous generator operating state:
When the rotating magnetic field speed of motor stator was slower than rotor rotating magnetic field speed, motor was exported the electric energy that the mechanical energy in the rotor is converted into stator, and this moment, motor promptly was in renewable hair motor operating state.
● the utilization of rotor flywheel energy:
When motor stator is used inverter supply, the stator incoming frequency is reduced, and rotor loop is kept rotation by the flywheel energy in the rotary system, be lower than the same frequency rotating speed of rotor when the frequency converter output frequency after, this moment, the speed of rotating magnetic field of rotor loop will be greater than the stator rotating magnetic field, thereby motor is converted into the flywheel energy of rotary system storage the electric energy of stator.
(2), utilize the flow process of rotor flywheel energy to describe after the frequency converter dead electricity:
● state is determined the preliminary adjustment in back during to the frequency converter dead electricity:
Dead electricity signal at frequency converter is determined, reduces the PWM output duty cycle of frequency converter to motor immediately, and frequency converter is reduced rapidly the electric current of motor, and capacitor array voltage can not descended fast.
● after the frequency converter dead electricity, the motor slip frequency is regulated:
After the frequency converter dead electricity, the running frequency of first quick adjustment frequency converter makes its synchronizing frequency that drops to the existing rotating speed of motor at short notice, for next step adjusting is got ready.
● when frequency converter output frequency decline state, the running status of conversion motor:
When frequency converter carries out the frequency adjustment, when measuring the variation of current of electric direction, show and drop to below the synchronous speed, is the PID state of a control with frequency from quick decline status adjustment, dynamic adjustments frequency fall off rate, change motor the state of asynchronous renewable hair motor into from the running status of asynchronous motor, change rotor into electric energy at the flywheel energy of storage.
● the frequency converter dead electricity keeps the stable of the interior voltage of power cell therebetween:
, keep the operation of motor regeneration asynchronous generator state in the frequency converter dead electricity therebetween, the flywheel energy in the rotor is converted to the consumption that electric energy is kept system.As the critical processes point, the rate adaptation by the frequency converter output frequency is descended makes capacitor array voltage remain on rated condition with capacitor array voltage.Its DSP program circuit as shown in Figure 3.
● the frequency converter high voltage source is recovered, and stablizes the motor operation:
After frequency converter high voltage source normal signal was determined, fast to adjusted, when measuring sense of current variation, stabilized frequency output time-delay prevented its vibration with the frequency converter output frequency.After motor changes the asynchronous motor running status fully over to, again frequency is raised to the numerical value before the dead electricity.
(3) utilize the DSP program submodule flow chart of rotor kinetic energy in the DSP program after the frequency converter dead electricity:
Utilize the description of flywheel energy according to the frequency converter dead electricity, be translated into the submodule in the DSP program, its whole framework program diagrams as shown in Figure 4
In conjunction with Fig. 5, utilize the flywheel energy continuous service test after the multilevel unit-in-series voltage-source type frequency converter dead electricity:
(1) the system circuit scheme after the change:
● add UPS in control system top layer current supply circuit, be used under any state, the power supply of retentive control power supply is stable.
● under the top layer current supply circuit, tell one group of supply 6KV and organize isolating transformer more, be used for to the control board power supply in the control unit, after the high pressure dead electricity, control board can continue to keep operation.It is as accompanying drawing 5.
● on the phase shifting transformer of major loop, increase the voltage detecting relay, be used to measure phase shifting transformer and whether be in powering state, and its status signal is passed to control unit.
(2) the control flow scheme after the change:
● after the dead electricity, control system receives the dead electricity signal, and the revolutional slip of motor in asynchronous operation crossed in downward modulation fast immediately, and motor is in regeneration asynchronous operation state.
● the flywheel energy in the rotor is converted into the power consumption that electric energy is used to keep the frequency converter major loop, carries out the loss that frequency convertor system was stored and kept to electric weight as energy storage relaying pond by the capacitor array in many level power unit.
● in the time of dead electricity, capacitor array is in the constant voltage charge state, uses the closed-loop adjustment unit of the magnitude of voltage of capacitor array as the frequency converter output frequency, the conversion of flywheel energy and system loss are maintained an equal level, capacitor array voltage is stable.
● after high voltage source is recovered, control system is received the power supply normal signal, frequency converter is regulated by fall off rate become the climbing speed adjusting, recovers the motoring of motor, its conversion is set and is the hyperbola setting, avoids occurring when motor status is changed the inertia load impacting.
● the frequency converter output frequency is risen by the speed of setting, reach the preceding frequency of dead electricity, system restoration arrives the state before the dead electricity.
(3) utilize the scheme test parameters of flywheel energy after the frequency converter dead electricity:
● running frequency: 50Hz source current 0.9A
● the rise time: 30s fall time: 300s
● dead electricity descends: 30s recovers to rise: 60s
● supply voltage: 6100V recovers conversion: 3s
(4) utilize the test data of the scheme of flywheel energy after the frequency converter dead electricity:
6, the continuous operating scheme typing of the instantaneous dead electricity of multilevel unit-in-series voltage-source type frequency converter high pressure:
(1) the instantaneous dead electricity of high pressure is moved research and development end setting scheme continuously:
The scheme of utilizing flywheel energy after the frequency converter dead electricity is through test, and the requirement when reaching the project input moves setting scheme continuously as the instantaneous dead electricity of high pressure.
(2) to move the setting scheme index continuously as follows for the instantaneous dead electricity of high pressure:
● have when frequency conversion system moves, high voltage source keeps frequency converter not trip when instantaneous disappearance.
● have after frequency converter high voltage source dead electricity, can utilize the flywheel capacity in the rotor-support-foundation system to keep operation continuously.
● had at big inertia, high-power, the wide application prospect in the big system can be implemented in the big system after the instantaneous dead electricity and vibration greatly or collapse do not appear in the power input system.
● under flywheel energy is supported in rotor; can realize not shutting down in the short time, will depend on flywheel energy memory space in the rotary system in the time of dead electricity operation, in a concrete system; when the quality of rotor loop and rotating speed fixedly the time, high maintenance of the dead electricity time had certainty.
● under the situation of long-time dead electricity, when rotating speed to the utmost when low, frequency converter autostop, and output alarm.To prevent under the misoperation situation, occurring unpredictalbe automatic operation phenomenon.
(3) utilize the multilevel unit-in-series voltage-source type frequency converter product of the continuous operating scheme fabrication techniques of the instantaneous dead electricity of high pressure.
Claims (5)
1, continues the frequency converter of operation during a kind of dead electricity, it comprises multilevel unit-in-series voltage-source type high voltage converter structure, its major loop structure is made of phase shifting transformer and power cell, high voltage source inserts the phase shifting transformer main winding, at the phase shifting transformer secondary 18 separate windings are arranged, winding connects 18 power cells respectively; The power cell inner member consists of: each unit is by rectification input diode bridge, storage capacitor, H bridge shape output copped wave IGBT connects to form, it is characterized in that: in the control current supply circuit, also be connected with UPS, connect heterogeneous isolated controlling transformer behind UPS, heterogeneous isolated controlling transformer inserts the power cell control loop of frequency converter; Between the high voltage source of major loop and phase shifting transformer main winding, be provided with dead electricity and detect relay; When dead electricity, control system receives the dead electricity signal, reduce the frequency converter running frequency fast, motor is in regeneration asynchronous operation state, flywheel energy in the rotor is converted into the power consumption that electric energy is used to keep the major loop of frequency converter, carry out the loss that frequency convertor system was stored and kept to electric weight by capacitor array as the energy storage relaying, electric capacity is in the constant voltage charge state; Not during dead electricity, do not carry out the flywheel energy in the rotor is converted into the operation of electric energy in system.
2, continue the frequency converter of operation during dead electricity according to claim 1, it is characterized in that: described UPS is that power is the uninterrupted power supply of 1.5kW.
3, continue the frequency converter of operation during dead electricity according to claim 1 and 2, it is characterized in that: described isolated controlling transformer export 18 independently 600V for input 220V, isolation fully between each output, and voltage withstand class is the isolated controlling transformer of 10kV.
4, continue the frequency converter of operation during dead electricity according to claim 1 and 2, it is characterized in that: described dead electricity detects relay, is common 380V voltage detecting relay.
5, continue the frequency converter of operation during dead electricity according to claim 3, it is characterized in that: described dead electricity detects relay, is common 380V voltage detecting relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100102759A CN100449923C (en) | 2006-07-12 | 2006-07-12 | Frequency transformer capable of continuously operating during power-off |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100102759A CN100449923C (en) | 2006-07-12 | 2006-07-12 | Frequency transformer capable of continuously operating during power-off |
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| CN1889350A CN1889350A (en) | 2007-01-03 |
| CN100449923C true CN100449923C (en) | 2009-01-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013149458A1 (en) * | 2012-04-01 | 2013-10-10 | 广东易事特电源股份有限公司 | Ups power source based on phase-shifting auto-transformer and dual 6-pulse rectifiers |
| WO2013155819A1 (en) * | 2012-04-20 | 2013-10-24 | 广东易事特电源股份有限公司 | Symmetrical ups power system based on nine-phase self-coupling phase-shifting transformer |
| RU209253U1 (en) * | 2021-11-29 | 2022-02-09 | Негосударственное частное образовательное учреждение высшего образования "Технический университет УГМК" | Uninterruptible power supply with the possibility of energy recovery |
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| CN101882906A (en) * | 2009-12-30 | 2010-11-10 | 王振民 | Novel power circuit of high-voltage SRD (Step Recovery Diode) |
| CN101924373A (en) * | 2010-04-19 | 2010-12-22 | 荣信电力电子股份有限公司 | Instantaneous power-down rebooting method for grid of high-voltage frequency converter |
| CN102355049B (en) * | 2011-10-11 | 2013-08-14 | 湖北三环发展股份有限公司 | Large power variable-frequency power supply device with adjustable output voltage ultra-wide range |
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| US5642275A (en) * | 1995-09-14 | 1997-06-24 | Lockheed Martin Energy System, Inc. | Multilevel cascade voltage source inverter with seperate DC sources |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013149458A1 (en) * | 2012-04-01 | 2013-10-10 | 广东易事特电源股份有限公司 | Ups power source based on phase-shifting auto-transformer and dual 6-pulse rectifiers |
| WO2013155819A1 (en) * | 2012-04-20 | 2013-10-24 | 广东易事特电源股份有限公司 | Symmetrical ups power system based on nine-phase self-coupling phase-shifting transformer |
| RU209253U1 (en) * | 2021-11-29 | 2022-02-09 | Негосударственное частное образовательное учреждение высшего образования "Технический университет УГМК" | Uninterruptible power supply with the possibility of energy recovery |
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