CN101594116A - Double-core-separation type surge torsion runaway frequency conversion inhibiting system for high voltage motor of power plant - Google Patents
Double-core-separation type surge torsion runaway frequency conversion inhibiting system for high voltage motor of power plant Download PDFInfo
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Abstract
Double-core-separation type surge torsion runaway frequency conversion inhibiting system for high voltage motor of power plant comprises high pressure IGBT four-quadrant frequency converter (1), high pressure double fed electric machine rotor four-quadrant frequency converter (2) and modified model Luo Binkang structure frequency converter (3).Wherein high pressure IGBT four-quadrant frequency converter (1) and high pressure double fed electric machine rotor four-quadrant frequency converter (2) all adopt the easy structure of a power cell.In the modified model Luo Binkang structure frequency converter (3), variable-frequency transformer (32) high-pressure side links to each other with power plant 6kV bus through high pressure pre-charger (31), and the non-homogeneous optimization phase shift of low-pressure side voltage is after matrix bus (33) is connected to 3 * N power cell group (34).Frequency convertor system adopts " double-core " to control and move back saturated braking scheme.Breathe heavily to turn round and fly inhibitor and be made up of master controller (70) and first module controller (71), second cell controller (72) and the 3rd cell controller (73), all controllers interconnect by the optical fiber CAN net.Power plant's high-voltage variable-frequency and variable-speed system that the present invention proposes, simple in structure, volume is little, and new construction replaces old structure, and cost is low, suppresses surge, torsional oscillation and driving, improves stability.
Description
Technical field
The present invention relates to a whole set of high-tension motor frequency conversion system of thermal power plant, comprising: high pressure IGBT four-quadrant frequency converter, high pressure double fed electric machine rotor four-quadrant frequency converter, modified model Luo Binkang structure frequency converter and branch volume matrix bus and high pressure pre-charger.And propose the double-core controller, move back saturated braking and " breathe heavily to turn round and fly " inhibitor is rotating stall and surge, twisting vibration and shimmy " driving " inhibitor that reaches.
Background technology
U.S. Luo Binkang released a kind of " perfect harmony high voltage converter " in 94 years, adopted variable-frequency transformer+multiple unit cascaded structure.This scheme cost height, bulky, complex structure, advantage are that heating disperses, and use low pressure IGBT, and harmonic wave is less.
Triumphant strange 97100477.3 patents of invention " high-voltage large-power frequency convertor without power network pollution " of having applied in 2000, this is the Luo Binkang structure.The Luo Binkang structure only provides an initial framework, implements and is not easy, and the implementation method of core component is also varied.A large amount of technological difficulties concentrate on drive controlling, overvoltage, the overheated and overcurrent protection of IGBT, effective programming and the collaborative work of DSP and FPGA, and in various types of signal transmission and the communication.Many companies throw the huge fund research and development several years and do not succeed, though some companies do relatively goodly, still there is the different room for improvement of degree in many aspects.
The outstanding problem of power plant high voltage converter is: (1) has quite a few frequency converter instability, causes and can not actually come into operation.In addition, the Luo Binkang structural volume is huge, is difficult to find correct position in the power plant, some power plant even make the meeting chamber into the frequency converter chamber.(2) the general DSP+FPGA pattern that adopts of Frequency Converter Control part, the FPGA designing technique is a professional technique that practicality is very strong.Except that the veteran expert of minority, there are potential problems such as logic competition, signal lag, the risk of gated clock combinational logic unavoidably in general design, even emulation or model machine do not demonstrate static dangerous sign or phenomenon, but in fact also can have very big hidden danger.(3) adopt resistance braking in the past, propose the four-quadrant power cell afterwards again, its advantage is the inversion fast braking, but caloric value heightens when normally moving, and produces also that variable-frequency transformer is uttered long and high-pitched sounds and more thorny stability problem.(4) most transducer power units adopt three-phase half control rectifier bridge, and realize dc capacitor precharge with thyristor gating circuit and diode-resistance loop.A frequency converter has tens cover power cells, thereby needs the supporting with it precharge loop of tens covers.Not only complicated, three characteristics of the middle term half control rectifier bridge owner loop of power circuit again, frequency converter reliability decrease.(5) " the no electric network pollution " of Luo Binkang structure is by variable-frequency transformer step-down, isolation and evenly phase shift realization.This phase shift scheme has different-effect under different loads, when the frequency converter underloading, the spike electric current of each power cell may also not fill up mutually, when heavy duty then on the basis that forms approximate square wave again superposition new spike, do not reach " perfect harmony ".
Power plant's high voltage converter obtains power supply from the 6KV bus, and output voltage also is 6KV, and variable-frequency transformer is unnecessary with regard to the voltage transformation angle.This structure of Luo Binkang is not only many with a transformer, and structure is too complicated, and being doomed from the beginning is a kind of transition structure, is eliminated at last.For avoiding using the variable-frequency transformer Chinese scholar once to propose the direct tandem plan of IGBT, because of the stray inductance of module-external series connection line does not attain the results expected greatly very much.6.5KV IGBT stable and reliable for performance puts goods on the market in the inner achieving success of IGBT but this serial connection technology is because of the short stray inductance of IGBT inside modules series connection line is little, and the condition that progressively replaces the Luo Binkang structure with new construction is ripe.In addition, the high-voltage asynchronous motor of China's part double-fed carries out rotor frequency conversion speed-adjusting with rectifier bridge+inverter bridge+transformer pattern, and it is lower that this method and stator frequency control compare the requirement of IGBT rated voltage, but speed adjustable range narrow be the big shortcoming of one.
The power plant blower fan system is not simple power saving, and Tu Chu contradiction is the stability and the reliability of blower fan system more.The blower fan reliability is not high to cause that the power generation loss that unplanned stoppage in transit and unplanned derating cause is very big, and wherein only the loss that causes of boiler induced-draft fan just comes the 6th.Blower fan system " breathe heavily to turn round and fly " comprises rotating stall and surge, twisting vibration and shimmy, and " driving " accident that fan blade all interrupts, parts fly out, blower fan body and motor are seriously damaged.Wherein the twisting vibration of rotor-coupling-wind wheel blade system is that the new problem frequency control in other words that RHVC is brought has aggravated this contradiction.As for rotating stall and surge, not only do not improve behind the part motor configuration converter plant, but more serious.Present measure is to allow the blower fan stability region operation under big air quantity all the time, when adopting part flow arrangement to make blade stall generation boundary layer separation block runner rough air is introduced annular flow path and eliminated, change blade shape, prescind blade and cut small impeller or the like.These measures have produced positive role, have improved stability, but conflict mutually with the reducing energy consumption of blower fan itself and the original idea of high-voltage motor energy-saving and frequency-variable again to a certain extent.
Summary of the invention
Technical problem: the objective of the invention is to propose a kind of double-core-separation type surge torsion runaway frequency conversion inhibiting system for high voltage motor of power plant, on global level, rotating stall and surge, twisting vibration and shimmy reach " driving " are monitored and Based Intelligent Control.
Technical scheme: high-pressure frequency-conversion system of power plant comprises the high pressure IGBT four-quadrant frequency converter, high pressure double fed electric machine rotor four-quadrant frequency converter and modified model Luo Binkang structure frequency converter, three kinds of schemes are supplemented each other, and constitute one and adapt to various power plant and the complete frequency conversion system from old structural transition to new construction step by step.
Double-core of the present invention-separation type high-voltage motor is breathed heavily to turn round and is flown frequency conversion inhibiting system and comprise high pressure IGBT four-quadrant frequency converter, high pressure double fed electric machine rotor four-quadrant frequency converter, modified model Luo Binkang structure frequency converter and breathe heavily to turn round and fly the inhibitor master controller; Wherein, the stator coil of a termination second high-voltage motor of high pressure IGBT four-quadrant frequency converter, another termination 6KV bus of high pressure IGBT four-quadrant frequency converter; One termination 400V bus of high pressure double fed electric machine rotor four-quadrant frequency converter, the rotor coil of another termination high pressure double feedback electric engine of high pressure double fed electric machine rotor four-quadrant frequency converter, the stator coil of high pressure double feedback electric engine connects the 6KV bus; The stator coil of output termination the 3rd high-voltage motor of modified model Luo Binkang structure frequency converter, the input termination 6KV bus of modified model Luo Binkang structure frequency converter; Described three kinds of frequency converters adopt the double-core controller; Breathe heavily to turn round and fly the inhibitor master controller and fly inhibitor first module controller and be connected with high pressure double fed electric machine rotor four-quadrant frequency converter by breathing heavily to turn round, fly inhibitor second cell controller and be connected by breathing heavily to turn round, fly inhibitor the 3rd cell controller and be connected with modified model Luo Binkang structure frequency converter by breathing heavily to turn round with the high pressure IGBT four-quadrant frequency converter.
Two back-to-back three phase full bridges that the high pressure IGBT four-quadrant frequency converter is made up of IGBT, the one side is connected to the 6KV bus through the first inductance capacitance carrier filter, the first high pressure pre-charger, and opposite side links to each other with second high-tension motor through the second inductance capacitance carrier filter; The DSP1 of double-core controller is connected to an IGBT driver after the DSP2 of the first optoelectronic transceiver circuit, optical fiber, the second optoelectronic transceiver circuit and double-core controller is synthetic, the DSP1 of double-core controller flies inhibitor second cell controller and links to each other with breathing heavily to turn round by the optical fiber CAN net.
Two back-to-back three phase full bridges that high pressure double fed electric machine rotor four-quadrant frequency converter is made up of low pressure IGBT, the one side is connected to the 400V bus through the 3rd inductance capacitance carrier filter, and opposite side is connected to the high pressure double fed electric machine rotor through the 4th inductor-capacitor carrier filter; The DSP3 of double-core controller is connected to the 2nd IGBT and drives after the DSP4 of multiply multiple twin flat wire, synthetic circuit and double-core controller is comprehensive, the DSP3 of double-core controller flies inhibitor first module controller and links to each other with breathing heavily to turn round by the optical fiber CAN net.
In the modified model Luo Binkang structure frequency converter, the 6KV power supply is connected to the 3rd high-tension motor through the second high pressure pre-charger, variable-frequency transformer, matrix bus, 3 * N power cell group and control system.
The matrix bus is made up of 3 * N root copper or aluminium conductor and epoxy resin fill insulant, three conductors of same power supply are horizontally at same one deck, vertical direction is arranged the N layer altogether, and the insulation between each conductor is by the low-voltage standards design, in the horizontal direction with the even some louvres that distribute of vertical direction.
The first high pressure pre-charger and the second high pressure pre-charger are made of a dibit isolating switch, a position is that normal state is traditional zero resistance conducting state, and another position is that the current-limiting resistance access main circuit that will have the High-Voltage Insulation insulator carries out precharge with the dc capacitor to each power cell.
Beneficial effect: propose the high pressure IGBT four-quadrant frequency converter, install no variable-frequency transformer, contrasting with Luo Binkang structure tens cover power cells only has a cover power cell, and frequency converter can parallel running.
Propose high pressure double fed electric machine rotor four-quadrant frequency converter, to supersynchronous speed governing on a large scale, power factor is variable from metasynchronism, metasynchronism and supersynchronous regenerative braking, but device parallel running.
Propose the matrix bus Luo Binkang structure frequency converter is resolved into two parts, to adapt to site space.Variable-frequency transformer pair side winding is optimized phase shift, reduces side harmonics.And overlap tens of simple and easy high pressure pre-charger replacement Luo Binkang structure with one and overlap complicated charge circuit.
Propose the double-core controller, be used for each power cell IGBT and trigger, avoid occurring problems such as fpga logic competition, signal lag, the risk of gated clock combinational logic.Saturated braking scheme is moved back in proposition, solve resistance braking power little, take up room and the four-quadrant power cell normally moves problems such as caloric value is big, transformer is uttered long and high-pitched sounds.
Propose " breathe heavily to turn round and fly " inhibitor, on global level, rotating stall and surge, twisting vibration and shimmy reach " driving " are monitored and Based Intelligent Control.
The present invention proposes a whole set of and is applicable to the particularly high-voltage variable-frequency and variable-speed system of blower fan of thermal power plant all kinds subsidiary engine.
The total cost that the high pressure IGBT four-quadrant frequency converter that proposes saves that variable-frequency transformer, structure are very simple, reliability is high, take up an area of less, take into account behind the simple and easy carrier filter of water cooling and both sides is about 1/2nd of Luo Binkang structure frequency converter, and net side and motor side waveform in fact also are better than the Luo Binkang structure.
The high pressure double feedback electric engine Wind-cooling type rotor four-quadrant frequency converter that proposes need not transformer, is about the twice of existing rotor frequency conversion speed-adjusting device from metasynchronism to hypersynchronous speed adjustable range, and is simple in structure, need not high pressure IGBT, little power consumption, and waveform is good.
The improvement that Luo Binkang structure frequency converter is proposed reduces simplified system, total cost, the requirement in site space and place is relaxed greatly, becomes more flexibly and practical, and the reliability of system is improved, and has further reduced side harmonics.The side harmonics reduction promptly means will significantly reduce the active filter burden that must dispose from now on when putting into operation frequency converter on a large scale.
When pipe network and blower fan system satisfied 60Hz electrical network standard, the various structure frequency converters of proposition all can form 60Hz equivalence electrical network in the part, improved the inherent stability of power plant's blower fan system.
" breathe heavily to turn round and fly " inhibitor that the present invention proposes, leading in the world in the comprehensive monitoring and the technology aspect the inhibition of rotating stall and surge, twisting vibration and shimmy and " driving ", be the exclusive patented technology of China." breathe heavily to turn round and fly " inhibitor and improve the stability of power plant's operation, significantly reduce the loss that unplanned stoppage in transit and unplanned derating cause.In addition, the potential application of frequency conversion system of the present invention is unrestricted.
Description of drawings
Fig. 1 is double-core of the present invention-separation type surge torsion runaway frequency conversion inhibiting system for high voltage motor of power plant schematic diagram,
Fig. 2 is a high pressure IGBT four-quadrant frequency converter schematic diagram,
Fig. 3 is a high pressure double fed electric machine rotor four-quadrant frequency converter schematic diagram,
Fig. 4 is a modified model Luo Binkang structure frequency converter schematic diagram,
Fig. 5 is 3 * N power cell group and control system schematic diagram,
Fig. 6 is matrix busbar cross-section schematic diagram (an A phase 3 * 7),
Fig. 7 is a high pressure pre-charger schematic diagram,
Fig. 8 moves back saturated braking circuit schematic diagram.
Have among the above figure: high pressure IGBT four-quadrant frequency converter 1, high pressure double fed electric machine rotor four-quadrant frequency converter 2, modified model Luo Binkang structure frequency converter 3, the first high pressure pre-charger 10, the second high pressure pre-charger 31, variable-frequency transformer 32, matrix bus 33,3 * N power cell group and control system 34 are breathed heavily to turn round and are flown inhibitor master controller 70, and first module controller 71, and second cell controller 72, and the 3rd cell controller 73, the second inductance capacitance carrier filters 11, the first inductance capacitance carrier filter 13, the 4th inductance capacitance carrier filter 21, the 3rd inductance capacitance carrier filter 22, synthetic circuit 25, multiply multiple twin flat wire 26, master control DSP5000, matrix bus epoxy resin or PVC insulation 331, matrix bus-bars conductor 332.
Move back saturated brake monitor 5111,5121,53N1, IGBT driving 14,23,5113,5123,53N3, DSP20 controller 15,24,5112,5122 in the double-core controller, 53N2, optoelectronic transceiver circuit 16,18,5114,5116,5124,5126,53N4,53N6, optical fiber 17,5115,5125,53N5, the DSP10 controller 19,27,5117,5127 in the double-core controller, 53N7.
Embodiment
High-pressure frequency-conversion system of power plant comprises the high pressure IGBT four-quadrant frequency converter, high pressure double fed electric machine rotor four-quadrant frequency converter and modified model Luo Binkang structure frequency converter, three kinds of schemes are supplemented each other, and constitute one and adapt to various power plant and the complete frequency conversion system from old structural transition to new construction step by step.
1, the high pressure IGBT four-quadrant frequency converter adopts two back-to-back three phase full bridge structures, one side three phase full bridge links to each other with power plant 6KV bus through simple and easy carrier filter and high pressure pre-charger, opposite side links to each other with high-voltage motor through simple and easy carrier filter, and adopts the double-core controller.Controller is connected with the high pressure IGBT optical fiber interface by optical fiber, and interconnects by the optical fiber CAN net with " breathe heavily to turn round and fly " inhibitor.Transducer power unit adopts insulation, less scaling generator cooling-water circulation to cool off.Consider the parallel running of device on the software design.
2, high pressure double feedback electric engine Wind-cooling type rotor four-quadrant frequency converter is pressed the two back-to-back three phase full bridge structures of IGBT or is adopted many level+three phase full bridge structure according to actual conditions in the employing.One side links to each other with power plant 400V bus-bar system through simple and easy carrier filter and pre-charger, and opposite side links to each other with high-voltage asynchronous rotor through simple and easy carrier filter, and adopts double-core control and metasynchronism over-synchronous braking.The double-core controller is connected with the IGBT driver module with the multiple twin flat wire, and main DSP (or MCU) is by optical fiber CAN net and the interconnection of " breathe heavily to turn round and fly " inhibitor.Radiator is considered the frequency converter parallel running based on air-cooled on the software design.Device carries out speed governing to hypersynchronous on a large scale in metasynchronism, and supersynchronous operation proposes new requirement to the mechanical strength of blower fan and motor in the 50Hz electrical network.The mechanical strength that reaches the equal unit of 60Hz electrical network can be carried out effective supersynchronous speed governing, and this requires not so difficult realization.Supersynchronous 20% just is equivalent to form 60Hz equivalence electrical network in the part, and 60Hz blower fan system rotor diameter is little under the equal conditions, blade is short, rotating speed is high, pipeline carefully is that the unit are flow is big, and these all help the inhibition of " breathe heavily to turn round and fly ".
3,, variable-frequency transformer and the opening of power cell component are put promptly so-called separation type at Luo Binkang structural volume characteristics.Variable-frequency transformer and power cell group are installed near the motor on the spot in principle, the motor side of original 6KV bus feeder cable is untied, reconfiguration is at variable-frequency transformer input place in parallel with by-pass switch, link to each other with the matrix bus between variable-frequency transformer and the power cell group, the three-phase voltage of power cell output is delivered to high-tension motor through stub cable.
Do not satisfy the power cell dc capacitor directly during the requiring of charging in the pressure drop of variable-frequency transformer leakage reactance, in order not make the power cell group make device complicated, adopt the dibit isolating switch of band high-voltage charging resistance (or bidirectional triode thyristor+high-voltage diode charging paths) because of increasing by tens cover triggerings and charge circuit.Whole frequency converter is only established a cover high pressure pre-charger, is installed in variable-frequency transformer 6KV mains side.A normal state that the position is an isolating switch of dibit isolating switch, thus the another location is to insert the high-voltage charging current-limiting resistance dc capacitor of each power cell of the variable-frequency transformer side of paying is carried out precharge.
The frequency converter side harmonics is that the load of rectifier bridge dc capacitor causes, and is a series of spike electric currents, and the inverter load small-pulse effect of healing is narrower.With regard to Luo Binkang even structure phase shift strategy, the spike of each power cell may also not filled up mutually when the frequency converter underloading, when heavy duty then on the basis that forms approximate square wave again superposition new spike.The specification of IGBT has only a few, but motor type is various, load constantly changes, so the assembly average of side harmonics is still more considerable after the filtering of Luo Binkang structure variable-frequency transformer △ winding, also has gap from " no electric network pollution " or " perfect harmony ".At the actual bringing onto load situation of motor, and, as index the variable-frequency transformer side of paying winding is optimized phase shift with the humorous assembly average that involves harmonic wave of maximum in conjunction with the actual use of frequency converter component specification.This inhomogeneous phase shift strategy is compared with the even phase shift of Luo Binkang structure does not increase any investment, pollutes this point particular importance that just seems when frequency converter puts into operation on a large scale but can further reduce side harmonics.
4, the double-core controller refers to each power cell configuration two DSP (or MCU), is called master controller and slave controller, and they split at the optical fiber two ends, and its duty of each thing is also standby each other.Main triggering signal is produced by the EV unit of DSP, and reliability is very high.Can also significantly shorten the length of IGBT triggering signal output line, reduce the influence of its stray inductance.Main DSP is by optical fiber CAN net and the interconnection of " breathe heavily to turn round and fly " inhibitor.Prescribe a time limit when reaching on the 80-85% rated speed, master controller switches to common frequency power network with motor, and frequency converter withdraws from.Move back saturated braking scheme and compare with the double frequency braking that Luo Binkang proposes recently, both all can significantly improve the braking moment of voltage source frequency converter, belong to independent intellectual property right but move back saturated braking scheme.Moving back saturated braking scheme is when motor speed needs downward modulation fast or hard stop; appropriateness control IGBT withdraws from degree of depth saturation condition; consume regenerated energy in the motor reduction of speed process fast with the speed that is better than resistance braking, avoid IGBT and dc capacitor to puncture because of the overvoltage that motor regeneration causes.Move back that IGBT will increase caloric value to a certain extent in the saturated braking procedure, but motor speed descends sharply or be about to shut down, follow-up caloric value also will decline to a great extent even disappear.Move back saturated braking scheme and compare with four-quadrant power cell inversion braking, can simplify wiring, save investment, improve reliability with resistance braking.
5, " breathing heavily to turn round and fly " inhibitor is made up of master controller and some cell controllers.A generator is established a master controller, and a frequency converter is established a cell controller.Master controller is by optical fiber CAN net and each cell controller and the interconnection of frequency converter master controller, and with stall protection and DCS communication.Soot particle deposition degree, part flow arrangement on cell controller collection gas flow and dust density, stream pressure and pulsating quantity thereof, unit vibration value, blower fan-motor torsional vibration of shafting value, the indirect shimmy value of fan blade, adjustment doors aperture, rotation speed of fan, current of electric, the blade are eliminated the parameters such as effective value that boundary layer separation is blocked runner, in separate unit blower fan scope, " breathe heavily to turn round and fly " monitored, if can make clear and definite ruling and then send instruction to the frequency converter master controller immediately, otherwise send up report to master controller.Master controller is after receiving the up report of each cell controller, and bonded boiler afterbody dust stratification situation is made calm measure that reply " breathes heavily to turn round and fly " or sent alarm signal, gets rid of sub-load signal even dynamo-electric stove full cut-off signal to Power Plant DCS on global level.
Concrete structure is as follows:
Double-core-separation type power plant high-voltage motor " is breathed heavily to turn round and is flown " frequency conversion inhibiting system and comprises high pressure IGBT four-quadrant frequency converter 1, high pressure double fed electric machine rotor four-quadrant frequency converter 2, modified model Luo Binkang structure frequency converter 3.Described high pressure IGBT four-quadrant frequency converter is not established variable-frequency transformer, and the one side links to each other with power plant 6KV bus through simple and easy carrier filter 13 and high pressure pre-charger 12, and opposite side links to each other with high-tension motor through simple and easy carrier filter 11.Described high pressure double fed electric machine rotor four-quadrant frequency converter 2, one sides link to each other with power plant 400V bus-bar system through simple and easy carrier filter, and opposite side links to each other with the high pressure double fed electric machine rotor through simple and easy carrier filter.Variable-frequency transformer 32 secondary side's windings of modified model Luo Binkang structure frequency converter are through non-homogeneous optimization phase shift, its high-pressure side links to each other with power plant 6KV bus through high pressure pre-charger 31, variable-frequency transformer 32 low-pressure sides are connected to 3 * N power cell group 34 through a minute volume matrix bus 33, and its output links to each other with high-tension motor.
1, high pressure IGBT four-quadrant frequency converter 1 adopts two back-to-back three phase full bridge structures, select for use the IGBT of model such as FZ400R65KF1 to form topological structure four-quadrant back-to-back converter 10 clearly, one side three phase full bridge links to each other with power plant 6KV bus through simple and easy carrier filter and high pressure pre-charger, and opposite side links to each other with high-tension motor through simple and easy carrier filter 11.Being connected to the high pressure IGBT optical fiber interface after first double-core controller DSP1 (or MCU) 19 synthesizes by optoelectronic transceivers 18, optical fiber 17 and optoelectronic transceivers 16 and with double-core controller DSP2 (or MCU) 15 is that IGBT drives, DSP1 and " breathe heavily to turn round and fly " inhibitor master controller and cell controller be by the interconnection of optical fiber CAN net, and with the Power Plant DCS communication.The power cell radiator adopts insulation, less scaling generator cooling-water circulation to cool off.Realize current-sharing by software during the device parallel running.When motor speed automatically switches to common frequency power network during greater than the 80-85% rated speed, reduce frequency inverter capacity and investment, and guarantee the overall system economy, because of near rated speed the time frequency modulation energy-saving not the power consumption of remarkable device itself but rise comparatively fast.Cut and to common frequency power network, " breathe heavily to turn round and fly " inhibitor and still it is monitored in real time and where necessary air door is suitably regulated.
The generating set higher to load changing rate, blower fan system satisfies 60Hz electrical network standard again, then frequency converter is set in the 60Hz operational mode, with make full use of 60Hz system speed adjustable range wide, regulate steadily, good energy-conserving effect and inhibition " breathe heavily to turn round and fly " characteristics such as capability is strong.
2, high pressure double fed electric machine rotor four-quadrant frequency converter 2 adopts model IGBT such as FF300R17ME3 or FZ800R33KL2C-B5 to form two back-to-back three phase full bridge (or many level+three phase full bridges) structures.One side links to each other with power plant 400V bus-bar system through simple and easy carrier filter 22 and pre-charger, and opposite side links to each other with the high-voltage electric machine rotor through simple and easy carrier filter 21.For low pressure IGBT such as FF300R17ME3, double-core controller DSP (or MCU) 27 is connected to synthetic circuit 25 by multiply multiple twin flat wire 26, is connected to IGBT driver module 23 with double-core controller DSP2 (or MCU) 24 after comprehensive.For middle IGBT that presses such as FZ800R33KL2C-B5, the double-core controller is connected to the IGBT driver module with optical fiber and optoelectronic transceivers.DSP1 (or MCU) interconnects by optical fiber CAN net and " breathe heavily to turn round and fly " inhibitor, and communicates by letter with DCS.The IGBT radiator is based on air-cooled, and special circumstances are used the generator cooling-water cooling.The current-sharing of parallel running frequency converter, metasynchronism and supersynchronous regenerative braking, detent torque size are all undertaken by software with the balance that starts current limliting.
Homemade motors such as YR5603-8,1000KW, stator current 126.0A, rotor current 581.0A, rotor rated voltage 1118V are in speed adjustable range, and rotor actual voltage ratio, rated voltage is little a lot, and most cases only need be selected low pressure IGBT.Double-fed high-voltage motor rotor four-quadrant frequency converter only at blower fan system by the new factory of 60Hz standard design and its whole effects of old factory competence exertion that put into the melting pot by this standard.
3, the 32 secondary side's windings of the variable-frequency transformer in the modified model Luo Binkang structure frequency converter 3 are through non-homogeneous optimization phase shift, its high-pressure side links to each other with power plant 6KV bus through the high pressure pre-charger, variable-frequency transformer 32 low-pressure sides are connected to 3 * N power cell group 34 through a minute volume matrix bus 33, and the output of power cell group 34 links to each other with high-tension motor.Variable-frequency transformer and power cell group are installed near the motor on the spot in principle, and the motor side of original 6KV bus feeder cable is untied, and reconfiguration is at the high pressure pre-charger.
When the pressure drop of variable-frequency transformer leakage reactance is not enough to the power cell dc capacitor directly charged, adopt the dibit isolating switch 31 of band high-voltage and current-limitation resistance (or bidirectional triode thyristor+high-voltage diode charging paths) to carry out precharge.The dibit isolating switch has normal state and two positions of Charging state, normal state is the traditional zero resistance conducting state of isolating switch, Charging state is meant through the high-voltage and current-limitation resistance with High-Voltage Insulation pottery sheath and connects, thereby the dc capacitor of each power cell of the variable-frequency transformer side of paying is carried out precharge.Whole frequency converter is only established a cover high pressure pre-charger, is installed in variable-frequency transformer 6KV mains side.
At the even phase shift strategy of Luo Binkang structure the assembly average of side harmonics is compared with " no electric network pollution " or " perfect harmony " and still had certain gap, this improvement project embodiment is at motor actual loading situation, and in conjunction with the actual use of frequency converter component specification, make index with the humorous assembly average that involves harmonic wave of maximum each winding voltage of the variable-frequency transformer side of paying is optimized phase shift calculating, and " the symmetrical vector method " that adopt us to propose realized above-mentioned optimization result, thereby determine no-load voltage ratio of each relevant winding of variable-frequency transformer.The transformer phase shifting parameter that obtains like this is obviously different with the Luo Binkang structure.This inhomogeneous phase shift strategy does not increase investment, can further reduce side harmonics assembly average and maximum, will significantly reduce the investment of active filter when the frequency converter large-scale application.
4, double-core controller DSP10 (or MCU) 19,27,5117,5127,53N7 adopt dsp chips such as TMS320F28335 or TMS320F2810, DSP20 controller 15,24,5112,5122,53N2 generally adopt dsp chips such as TMS320F2810, split at optical fiber 5115,5125,53N5 two ends, with corresponding optoelectronic transceivers connection.For high pressure IGBT four-quadrant frequency converter 1 and high pressure double fed electric machine rotor four-quadrant frequency converter 2, main triggering signal is produced by the EV unit of DSP1.For modified model Luo Binkang structure multiple unit Series Frequency Conversion device, main triggering signal is by master control DSP and the collaborative generation of each power cell DSP1.DSP10 is owing to any reason lossing signal, and corresponding DSP20 controller can be filled immediately, this double-core controller reliability height, and holding wire is short, and stray inductance is little.The double-core controller system is by optical fiber CAN net and the interconnection of " breathe heavily to turn round and fly " inhibitor.
Moving back saturated braking is when motor speed needs sharply downward modulation or hard stop, and appropriateness control IGBT withdraws from degree of depth saturation condition, consumes the regenerated energy in the motor reduction of speed process rapidly, avoids IGBT and dc capacitor over-voltage breakdown.Move back saturated braking 5111,5121,53N1 when urgent reduction of speed of needs or hard stop, DSP sends and moves back saturated instruction Rg3a or Rg3b are dropped into, and it is saturated and enter the amplification region to a certain extent to make IGBT withdraw from the degree of depth, thereby consumes regenerated energy.Shut down because of motor speed is descending or is being about to, follow-up caloric value is little, as long as the proper extra heating of moving back in the saturated braking procedure of control can not constitute a threat to.Move back saturated braking scheme and compare with four-quadrant power cell inversion braking, can simplify wiring, save investment, improve reliability with resistance braking.
5, the control performance of " breathing heavily to turn round and fly " inhibitor had both depended on controller, also depend on controlled device, therefore Controlling Auxiliaries in Power Plants particularly blower fan system must be in more rational state, this just requires that the multi-body system characteristic of non-permanent aerodynamics and the solid coupling of stream is had more profound analysis and calculating.Breathe heavily and turn round that to fly the inhibitor specific implementation process as follows:
(1) though the stalling angle of rotating vane and pitching vibration blade is bigger than static vane, when the angle of attack was increased to certain value, separated always in the aerofoil profile boundary layer.Wherein leading edge is separated the most seriously, and when promptly reaching certain angle of attack, bubble breaks suddenly, and lift coefficient reaches to descend suddenly after the maximum and forms runner and block.Even return to the angle of attack before the stall after the stall of aerofoil profile boundary layer separation at once, the aerofoil profile boundary layer separation can not return to the flow regime before separating at once yet.Wind wheel absorbed power coefficient shows with the Changing Pattern of tip speed ratio: the high solidity wind wheel resemble the blower fan, high wind wheel absorbed power coefficient can only keep in a narrower tip speed ratio scope.By the change rotating speed unit is moved under best tip speed ratio and change flow, and Maximum Power Output, then be a basic task of frequency control.The factor that influences the aerofoil profile stalling characteristics mainly contains the leading edge of aerofoil profile and relative thickness, the angle of attack, Reynolds number etc.After aerofoil profile was given, the influence of Reynolds number was the most obvious: a thin airfoil will transfer leading edge to from thin airfoil stall and separate when Reynolds number increases.The aerofoil profile of an intermediate gauge will transfer thin wing to and separate when Reynolds number reduces.Axial flow flow-mixing blower fan and high pressure forward direction blade centrifugal blower saddle-shape characteristic are exactly a kind of form of expression of above-mentioned relevant mechanism.These all are the basic foundations of blower fan system transformation and the design of " breathe heavily to turn round and fly " inhibitor.
The stall proof measure of power plant at present is to allow blower fan all the time in the operation of big air quantity stable region, but new instability can occur again when Reynolds number is too big.In addition; blower fan configuration part flow arrangement and stall protection; Fan Selection is not excessive, to the excessive unit of type selecting prescind blade, cut small impeller or reduce the stifled ash of blade, reasonable Arrangement air channel and boiler tail automatically measures such as removing be to breathe heavily to turn round to fly that inhibitor better plays a role and the essential condition of blower fan system stable operation.
(2) the power plant's blower fan stream multi-body system that is coupled admittedly relates generally to non-permanent air force, blade natural frequency and the vibration shape thereof, power drive system vibration, the vibration of motor main field and Harmonious Waves in Power Systems disturbance and control system effect or the like.Finite Element 5 nodes 15 degree of freedom beam element model are adopted in analytical calculation, and aerodynamic model employing road, Theo Senn process is determined lift and the moment on the blade foline.Coordinates computed system comprises that abc inertial coodinate system, non-inertia rotating coordinate system and blade wave coordinate system.Park equation and blade rotor kinetics equation according to given motor, and non-inertia rotating coordinate system and carrier inertial force and the coriolis force of waving the increase of coordinate system particle, adopt subspace independence iterative method, and displacement on each subsystem joint face and dynamic balance are coupled to the simulation calculation that whole system is carried out various responses.Obtain the characteristic value of coupled system incremental form equation of motion state-transition matrix under the microvariations simultaneously, determine the stability of the shimmy frequency of blade, rotor torsion frequency and system.
(3) " breathing heavily to turn round and fly " inhibitor has related parameter to make system mode transfer matrix characteristic value real part for negative and certain nargin arranged by regulating system.Inhibitor is made up of master controller 70 and first, second, third cell controller 71,72,73 etc.A generator is established a master controller, and a frequency converter is established a cell controller.Master controller 70 is TMS320F28335,256K * 16 Flash, 34K * 16 SARAM.Cell controller 71 grades are TMS320F2810.Each cell controller interconnects by the CAN of optical fiber and master controller, and forms the optical fiber CAN net with the CAN of frequency converter master controller DSP1 (TMS320F28335 or TMS320F2810), and master controller 70 is also kept in communication with DCS.Cell controller 71 grades are utilized 16 road AD of TMS320F2810 to gather soot particle deposition degree, part flow arrangement on gas flow, stream pressure and pulsating quantity thereof, unit vibration value, blower fan-motor torsional vibration of shafting value, the indirect shimmy value of fan blade, adjustment doors aperture, rotation speed of fan, current of electric, air channel air-flow dust burdening, the stifled grey degree of boiler tail, the blade and are met with parameters such as frequency that runner blocks and time, obtain the characteristic values of system mode transfer matrix through a large amount of calculating.Degree and the rate travel decision regulation scheme that moves to zero point according to the characteristic value real part return stable region up to characteristic value again, and master controller sends report to DCS.Can not recall to stable region as the system features value, promptly system will lose stablely, and then master controller sends alarm signal to DCS, and collaborative DCS decision generating set is partial load rejection or dynamo-electric stove full cut-off.
Vane dust deposition causes the leading edge of aerofoil profile and relative thickness to change, and causes air quantity to descend, and will cause blade stall when serious.Power plant's wind duct temperature height; sometimes also have than high-moisture; some chemical composition will crystallization even epitaxial growth on blade under this environment; its density and intensity are all than higher; thoroughly remove unless shut down otherwise just be difficult to; its direct result be blade leading edge particularly relative thickness change, and then cause the variation of stalling characteristics, so the various measures before crystallization or the epitaxial growth can not produce a desired effect." breathe heavily to turn round and fly " inhibitor and mainly obtain the stalling characteristics of blower fan system under new situation, and take the adjusting strategy that adapts, suppress the generation of " breathe heavily to turn round and fly " from the characteristic value situation of change of system mode transfer matrix.
Claims (6)
1. double-core-separation type high-voltage motor is breathed heavily to turn round and is flown frequency conversion inhibiting system, it is characterized in that this system comprises high pressure IGBT four-quadrant frequency converter (1), high pressure double fed electric machine rotor four-quadrant frequency converter (2), modified model Luo Binkang structure frequency converter (3) and breathes heavily to turn round to fly inhibitor master controller (70); Wherein, the stator coil of a termination second high-voltage motor (D2) of high pressure IGBT four-quadrant frequency converter (1), another termination 6KV bus of high pressure IGBT four-quadrant frequency converter (1); One termination 400V bus of high pressure double fed electric machine rotor four-quadrant frequency converter (2), the rotor coil of another termination high pressure double feedback electric engine (D1) of high pressure double fed electric machine rotor four-quadrant frequency converter (2), the stator coil of high pressure double feedback electric engine (D1) connects the 6KV bus; The stator coil of output termination the 3rd high-voltage motor (D3) of modified model Luo Binkang structure frequency converter (3), the input termination 6KV bus of modified model Luo Binkang structure frequency converter (3); Described three kinds of frequency converters adopt the double-core controller; Breathe heavily to turn round and fly inhibitor master controller (70) and fly inhibitor first module controller (71) and be connected with high pressure double fed electric machine rotor four-quadrant frequency converter (2) by breathing heavily to turn round, fly inhibitor second cell controller (72) and be connected by breathing heavily to turn round, fly inhibitor the 3rd cell controller (73) and be connected with modified model Luo Binkang structure frequency converter (3) by breathing heavily to turn round with high pressure IGBT four-quadrant frequency converter (1).
2. double-core according to claim 1-separation type high-voltage motor is breathed heavily to turn round and is flown frequency conversion inhibiting system, it is characterized in that two back-to-back three phase full bridges (10) that high pressure IGBT four-quadrant frequency converter (1) is made up of IGBT, the one side is connected to the 6KV bus through the first inductance capacitance carrier filter (13), the first high pressure pre-charger (12), and opposite side links to each other with second high-tension motor (D2) through the second inductance capacitance carrier filter (11); The DSP1 of double-core controller (19) is connected to an IGBT driver (14) after the first optoelectronic transceiver circuit (18), optical fiber (17), the second optoelectronic transceiver circuit (16) are synthetic with the DSP2 (15) of double-core controller, the DSP1 of double-core controller (19) flies inhibitor second cell controller (72) and links to each other with breathing heavily to turn round by the optical fiber CAN net.
3. double-core according to claim 1-separation type high-voltage motor is breathed heavily to turn round and is flown frequency conversion inhibiting system, it is characterized in that two back-to-back three phase full bridges (20) that high pressure double fed electric machine rotor four-quadrant frequency converter (2) is made up of low pressure IGBT, the one side is connected to the 400V bus through the 3rd inductance capacitance carrier filter (22), and opposite side is connected to the high pressure double fed electric machine rotor through the 4th inductor-capacitor carrier filter (21); The DSP3 of double-core controller (27) is connected to the 2nd IGBT and drives (23) after multiply multiple twin flat wire (26), synthetic circuit (25) are comprehensive with the DSP4 (24) of double-core controller, the DSP3 of double-core controller (27) flies inhibitor first module controller (71) and links to each other with breathing heavily to turn round by the optical fiber CAN net.
4. double-core according to claim 1-separation type high-voltage motor is breathed heavily to turn round and is flown frequency conversion inhibiting system, it is characterized in that in the modified model Luo Binkang structure frequency converter (3) that the 6KV power supply is connected to the 3rd high-tension motor (D3) through the second high pressure pre-charger (31), variable-frequency transformer (32), matrix bus (33), 3 * N power cell group and control system (34).
5. double-core according to claim 4-separation type high-voltage motor is breathed heavily to turn round and is flown frequency conversion inhibiting system, it is characterized in that matrix bus (33) is made up of 3 * N root copper or aluminium conductor (332) and epoxy resin fill insulant (331), three conductors of same power supply are horizontally at same one deck, vertical direction is arranged the N layer altogether, insulation between each conductor is by the low-voltage standards design, in the horizontal direction with the even some louvres that distribute of vertical direction.
6. double-core according to claim 4-separation type high-voltage motor is breathed heavily to turn round and is flown frequency conversion inhibiting system, it is characterized in that the first high pressure pre-charger (12) and the second high pressure pre-charger (31) are made of a dibit isolating switch, a position is that normal state is traditional zero resistance conducting state, and another position is that the current-limiting resistance access main circuit that will have the High-Voltage Insulation insulator carries out precharge with the dc capacitor to each power cell.
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Cited By (6)
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| CN102437807A (en) * | 2010-10-26 | 2012-05-02 | 国家电网公司 | Variable frequency transformer control system |
| CN104167907A (en) * | 2014-08-28 | 2014-11-26 | 辽宁荣信电气传动技术有限责任公司 | Multi-machine parallel control topological structure based on high-voltage inverters |
| CN104329281A (en) * | 2014-10-20 | 2015-02-04 | 东方日立(成都)电控设备有限公司 | Variable frequency energy-saving system for movable blade adjustable type induced draft fan |
| CN108225696A (en) * | 2016-12-21 | 2018-06-29 | 南京农业大学 | Energy shafting torsional oscillation tests system |
| CN110112743A (en) * | 2019-04-04 | 2019-08-09 | 上海电力学院 | A kind of isolated form variable-frequency transformer and its starting control and expansion method |
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2009
- 2009-07-01 CN CN2009100323384A patent/CN101594116B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102437807A (en) * | 2010-10-26 | 2012-05-02 | 国家电网公司 | Variable frequency transformer control system |
| CN102437807B (en) * | 2010-10-26 | 2013-10-30 | 国家电网公司 | Variable frequency transformer control system |
| CN104167907A (en) * | 2014-08-28 | 2014-11-26 | 辽宁荣信电气传动技术有限责任公司 | Multi-machine parallel control topological structure based on high-voltage inverters |
| CN104329281A (en) * | 2014-10-20 | 2015-02-04 | 东方日立(成都)电控设备有限公司 | Variable frequency energy-saving system for movable blade adjustable type induced draft fan |
| CN104329281B (en) * | 2014-10-20 | 2017-06-13 | 东方日立(成都)电控设备有限公司 | A kind of adjusting rotor blade formula air-introduced machine frequency conversion energy-saving system |
| CN108225696A (en) * | 2016-12-21 | 2018-06-29 | 南京农业大学 | Energy shafting torsional oscillation tests system |
| CN108225696B (en) * | 2016-12-21 | 2023-06-27 | 南京农业大学 | Energy feedback type shafting torsional vibration testing system |
| CN110112743A (en) * | 2019-04-04 | 2019-08-09 | 上海电力学院 | A kind of isolated form variable-frequency transformer and its starting control and expansion method |
| CN113934135A (en) * | 2021-12-14 | 2022-01-14 | 国网江苏省电力工程咨询有限公司 | Compound monitored control system based on electric power piping lane |
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