CN102570507A - Energy feedback type diesel engine testing device - Google Patents
Energy feedback type diesel engine testing device Download PDFInfo
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- CN102570507A CN102570507A CN2012100302905A CN201210030290A CN102570507A CN 102570507 A CN102570507 A CN 102570507A CN 2012100302905 A CN2012100302905 A CN 2012100302905A CN 201210030290 A CN201210030290 A CN 201210030290A CN 102570507 A CN102570507 A CN 102570507A
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Abstract
The invention discloses an energy feedback type diesel engine testing device. An input end of a rectifier is connected with a diesel engine by a synchronous generator; an output end of the rectifier is connected with a direct-current boost converter; the direct-current boost converter is connected with a grid-connected inverter; the grid-connected inverter is connected with an input end of a grid-connected transformer; an output end of the grid-connected transformer is connected with a power grid by a switch cabinet; when tested, the diesel engine drives the synchronous generator to generate an alternating current (AC) with variable frequencies and amplitudes; the AC is rectified to become a direct current (DC) by the rectifier; and power output by a diesel engine set is transmitted to the power grid through the direct current boost converter, the grid-connected inverter, the grid-connected transformer and the switch cabinet in turn. The device has the advantages of high electric energy quality and low maintenance cost, and occupies a small space; the energy in the testing process of the diesel engine is sent back to the power grid, so that the problem of energy waste and problems about environment control and the like caused by temperature raising in testing sites are solved.
Description
Technical field
The present invention relates to a kind of experimental rig that is used for the diesel engine bench load test; Especially relate to a kind of ship power supply system that is widely used in, diesel locomotive electric power system, power plant stand-by power supply, family car, and the energy of the diesel engine of the medium occasion of mine vehicle traction when carrying out load test feeds back to the device of electrical network.
Background technology
Diesel engine unit is very extensive in the application of all trades and professions; Can be used as power-supply device and generator fit applications in occasions such as ship power supply system, diesel locomotive electric power system, power plant stand-by power supplies, also can be used as power-equipment and cooperate straight gearbox to be applied in family car and the mine vehicle traction.But,, before it is applied in above-mentioned concrete occasion, need through multiple test for diesel engine unit.Use diesel engine unit to be example with Ship Propeling, national shipbuilding industry standard C B/T 3254 has just stipulated tens of bench tests.
All under different rotating speed, load corresponding power in its development process and during delivery test and make an experiment, just can offer the terminal use through test and use according to its design curve.Generally speaking to be equipped with the form test loading that high-power synchronous generator and other equipment are converted into the mechanical energy of diesel engine output electric energy.Be example with certain diesel oil for locomotive machine delivery test, as shown in table 1, its delivery test requires when 400r/min, to load the 297kW test; When 900r/min, load the 1493kW test, as shown in the table, the test power that corresponding different rotating speed loads is inequality; In addition, diode rectifier output voltage transformation range is also very big, from 300V～900V; So big change in voltage scope can't directly be used to combining inverter; Therefore adopt DC booster converter that these voltage transformations are arrived suitable value,, through combining inverter electric energy is presented the telegram in reply net then like 1000V.
| Test event | Rotating speed r/min | Direct voltage | Power kW | |
| 1 | 400 | 299 | 290 | |
| 2 | 550 | 395 | 670 | |
| 3 | 750 | 482 | 1100 | |
| 4 | 900 | 540 | 1480 | |
| 5 | 1000 | 624 | 2240 | |
| 6 | 1000 | 725 | 2900 | |
| 7 | 1000 | 799 | 3700 | |
| 8 | 1000 | 891 | 4600 |
Certain type locomotive of table 1 is with the diesel engine load test requirement of dispatching from the factory
For these experiments; The overwhelming majority belongs to load test; And the mode of at present employing the " diesel engine+synchronous generator+not control rectifier+load resistance " makes an experiment more; Few part has adopted " diesel engine+synchronous generator+control rectifier+DC motor+synchronous generator+switch cubicle is not incorporated into the power networks ", and promptly so-called " unit method " makes an experiment.The former all consumes the energy that the process of the test diesel engine is exported through load resistance, belong to full energy-dissipating type, and is not energy-conservation fully; The latter then delivers to diesel engine output energy in the process of the test on the electrical network through DC motor and synchronous generator, belongs to energy-saving.With the 16RK270 marine diesel is example, and its puopulsion characteristic test is only operated at full capacity the test power of a needs just up to 4500kW, and test requirements document continues to carry out several hours, if therefore adopt resistance energy consumption formula test method, the energy waste that causes is considerable.For the latter, owing to relate to jumbo DC generator and synchronous generator, bulky, the unit maintenance workload is quite big, and when is incorporated into the power networks under a lot of situation and send electricity often to depend on operating personnel's artificial judgment, and reliability is low and program is loaded down with trivial details.
In order to solve top two kinds of problems that method is brought, use " diesel engine+synchronous generator+not control rectifier+thyristor active inverter " scheme is arranged in the prior art, with generator output feeding electric energy in the process of the test to electrical network.But, therefore, electrical network can cause sizable harmonic pollution when presenting energy to electrical network because thyristor belongs to the half control device.Thyristor active inverter work simultaneously will absorb a large amount of idle from electrical network, cause net side power factor very low.Therefore this scheme must be equipped with very jumbo reactive-load compensation equipment harmonic abatement equipment and could use, and the shortcoming ten minutes is remarkable.
In the middle of prior art, the scheme that prior art 1 is mentioned in " 16V280 diesel engine test energy recycle device scheme is inquired into " literary composition that " rolling stock technology " magazine was delivered on the 3rd phase in 1997 for QiShuYan vehicle Factory Song Chong river.The scheme that this article adopts is " diesel engine+synchronous generator+not control rectifier+thyristor active inverter " scheme.But because thyristor belongs to the half control device, therefore when electrical network is presented energy, can cause sizable harmonic pollution to electrical network, thyristor active inverter work simultaneously will absorb a large amount of idle from electrical network, cause net side power factor very low.Therefore this scheme must be equipped with very jumbo reactive-load compensation equipment harmonic abatement equipment and could use, and the shortcoming ten minutes is remarkable.Its main electrical scheme is shown in accompanying drawing 1.Because the thyristor that main circuit adopts belongs to the half control device; Therefore, electrical network can cause sizable harmonic pollution when presenting energy to electrical network; Thyristor active inverter work simultaneously will absorb a large amount of idle from electrical network, required idle 40%～60% of the DC side through-put power that accounts for, and AC network side power factor is very low; Therefore this scheme must be equipped with very jumbo reactive-load compensation equipment harmonic abatement equipment and could use, and the shortcoming ten minutes is remarkable.In addition, when slow-speed of revolution small-power is tested, because diode rectifier can not be exported sufficiently high voltage, so system can not work in these tests.
Master degree candidate's paper that prior art 2 is delivered on June 1st, 2005 for the Lu Mei of Southwest Jiaotong University rosy clouds " test of novel diesel generating set is with the research of Energy Feedback System ".Propose a kind of diesel engine generator in this article and use Energy Feedback System, shown in its system configuration such as the accompanying drawing 2 based on the PWM rectifier.Mainly form by uncontrollable rectifier, LC filter, PWM rectifier, transformer and control protection electric circuit.What but this article removed overwhelming majority discussion all is Three-Phase PWM Rectifier; Get in touch considerably less with the key of diesel engine test aspect; PWM rectifier DC input side is made up of uncontrollable rectifierization gold and LC filter in the scheme of its proposition, but in fact, under the various operating condition of test of diesel engine; The variation of uncontrollable rectifier output voltage is very large; Use diesel engine to be example with the 16V265 type locomotive, its sky (gently) carries that running-in test, universal spy are newly tested, always total tens of of the test of stabilization of speed type and last appearance acceptance test projects, and diode rectifier output voltage average value typical change scope is between 300V～1000V during test.And the PWM rectifier requires dc voltage must more stablely could guarantee that its output voltage amplitude and phase place and line voltage are complementary to the electrical network feedback energy.Therefore the scheme that this article proposed does not possess using value.Do not consider in addition with in the compatible aspect of the electrical network literary composition.
In sum, no matter from energy savings, improve the consideration of performance of enterprises aspect still from reducing the unit maintenance workload, improving test efficiency and reliability consideration, conventional diesel engine load test system demands revolution urgently.
Summary of the invention
The purpose of this invention is to provide a kind of energy feedback type diesel engine experimental rig, this device solves prior art diesel engine unit experimental provision energy resource consumption and floor space is big, reliability is low, difficultly safeguard more serious to electric network pollution simultaneously technical problem.
In order to realize the foregoing invention purpose; The present invention specifically provides a kind of technic relization scheme of energy feedback type diesel engine experimental rig; A kind of energy feedback type diesel engine experimental rig comprises: rectifier, DC booster converter, combining inverter and the transformer that is incorporated into the power networks, and the input of rectifier connects diesel engine through synchronous generator; The output of rectifier links to each other with DC booster converter; DC booster converter links to each other with combining inverter, and combining inverter links to each other with the input of the transformer that is incorporated into the power networks, and the output of the transformer that is incorporated into the power networks links to each other with electrical network through switch cubicle; When carrying out the diesel engine test; Diesel engine drives the alternating current that synchronous generator sends frequency and magnitude, becomes direct current through rectifier rectification, and the power delivery of diesel engine unit being exported through DC booster converter, combining inverter, be incorporated into the power networks transformer and switch cubicle successively again is to electrical network.
Further improvement as a kind of energy feedback type diesel engine of the present invention experimental rig technical scheme; Rectifier adopts the uncontrollable rectifier of diode; The uncontrollable rectifier of diode further is again a three-phase bridge rectifier; The size of synchronous generator output and the AC voltage conversion of frequency change are become direct voltage, the energy of exporting to DC booster converter transmission diesel engine simultaneously; DC booster converter is that combining inverter provides the galvanic current source; Combining inverter is alternating current with the power output of the diesel engine that the DC booster converter transmission comes from the direct voltage inversion; Be fed back to electrical network through the transformer that is incorporated into the power networks, this transformer that is incorporated into the power networks provides necessary electrical isolation between electrical network and testing equipment and quilt examination diesel engine simultaneously.
As the further improvement of a kind of energy feedback type diesel engine of the present invention experimental rig technical scheme, combining inverter adopts multiple inverter configuration, and combining inverter comprises the converter cell that two groups or more is parallel with one another.
Further improvement as a kind of energy feedback type diesel engine of the present invention experimental rig technical scheme; The multiple input winding construction of the transformer adopting that is incorporated into the power networks; The transformer that is incorporated into the power networks comprises the input winding that two groups or more is identical with the converter cell quantity of combining inverter, and each output of the converter cell of combining inverter links to each other with one of the transformer that is incorporated into the power networks corresponding input winding.
Further improvement as a kind of energy feedback type diesel engine of the present invention experimental rig technical scheme; The converter cell of combining inverter adopts four-quadrant voltage-source type PWM current transformer; The converter cell of combining inverter runs on unity power factor active inversion state, and converter cell comprises AC side inductance and switching device.
Further improvement as a kind of energy feedback type diesel engine of the present invention experimental rig technical scheme; DC booster converter adopts a heavy or heavy above booster circuit unit parallel connection formation; The booster circuit unit adopts Boost type DC/DC booster circuit; The variable dc voltage conversion of amplitude that is used for the uncontrollable rectifier output of diode is that galvanic current presses the confession combining inverter to use, and the booster circuit unit comprises boost inductance, fly-wheel diode, switching tube and DC side output capacitance.
Further improvement as a kind of energy feedback type diesel engine of the present invention experimental rig technical scheme; Energy feedback type diesel engine experimental rig comprises the DC booster converter control module; The DC booster converter control module comprises outer voltage control module and current inner loop control module; The outer voltage control module comprises the first sampling filter unit, a PI regulon and the first equal subdivision; The first sampling filter unit is gathered the DC booster converter output voltage and is exported in the PI regulon; And with target voltage in a PI regulon, compare regulate with PI after, output total current set-point exports boost inductance average current set-point or the fly-wheel diode average current set-point of DC booster converter as every heavy booster circuit unit to after being divided into the n equal portions through the first equal subdivision; The current inner loop control module comprises that the 2nd PI regulon, amplitude limit unit, triangular carrier form unit, the second sampling filter unit and mean value and ask for the unit; Second sampling filter unit collection boost inductance real-time current signal exports to and exports the 2nd PI regulon to after mean value is asked for the unit averaged; Compare in the 2nd PI regulon with boost inductance average current set-point and to export the switching tube dutyfactor value signal that the amplitude limit unit obtains every heavy booster circuit unit to after regulating with PI; Triangular carrier forms the unit produces the mutual phasing identical with tuple according to the tuple of DC booster converter multichannel triangular carrier; Every road triangular carrier is delivered to ring control module in the current corresponding; After comparing with above-mentioned switching tube dutyfactor value signal; Obtain the PWM triggering signal, as the drive control signal of booster circuit unit switch pipe.
Further improvement as a kind of energy feedback type diesel engine of the present invention experimental rig technical scheme; Energy feedback type diesel engine experimental rig comprises the combining inverter control module; The combining inverter control module comprises given module of active current and current inner loop control module; The given module of active current comprises that first loads setup unit transit time, active current stable state set-point computing unit, active current set-point computing unit and the second equal subdivision; Test required loading power signal and input to first loading setup unit transit time; Obtain active current stable state set-point signal through active current stable state set-point computing unit again, the process active current set-point computing unit and the second equal subdivision obtain the active current set-point signal of the every heavy converter cell of combining inverter in the next control cycle; The current inner loop control module comprises the 3rd PI regulon, the 4th PI regulon, coordinate transformation unit, phase locked-loop unit, the 3rd sampling filter unit, the 4th sampling filter unit and phase-shifting carrier wave sinusoidal pulse width modulation unit; The be incorporated into the power networks ac current signal of input winding of transformer of the 3rd sampling filter unit collection; And export coordinate transformation module to; The ac voltage signal of the converter cell of combining inverter is gathered in the 4th sampling filter unit; Through exporting coordinate transformation unit to behind the phase locked-loop unit calculating voltage phase angle; Obtain the active component of current and the reactive component of current, compare with active current set-point and reactive current set-point respectively, difference respectively through the 3rd PI regulon and the 4th PI regulon compare regulate and computing after obtain the modulating wave instruction value signal; The modulating wave command signal obtains the start pulse signal of converter cell switching device behind phase-shifting carrier wave sinusoidal pulse width modulation unit, and exports it converter cell of combining inverter to.
Another kind of technical scheme as a kind of energy feedback type diesel engine of the present invention experimental rig; Energy feedback type diesel engine experimental rig comprises the DC booster converter control module; The DC booster converter control module comprises given module of average current and current inner loop control module; The given module of average current comprises that second loads setup unit transit time, average current stable state set-point computing unit, average current set-point computing unit and the 3rd equal subdivision; Test required loading power signal and input to second loading setup unit transit time; Obtain the average current stable state set-point signal of every heavy DC booster converter again through average current stable state set-point computing unit; Export average current set-point computing unit to, carry out the n equation through the 3rd equal subdivision again after, obtain the average current set-point signal of the every heavy booster circuit of booster converter unit; The current inner loop control module comprises that the 2nd PI regulon, amplitude limit unit, triangular carrier form unit, the second sampling filter unit and mean value and ask for the unit; Second sampling filter unit collection boost inductance real-time current signal exports to and exports the 2nd PI regulon to after mean value is asked for the unit averaged; Compare in the 2nd PI regulon with boost inductance average current set-point and to export the switching tube dutyfactor value signal triangular carrier that the amplitude limit unit obtains every heavy booster circuit unit after regulating with PI to and form the unit produces the mutual phasing identical with tuple according to the tuple of DC booster converter multichannel triangular carrier; Every road triangular carrier is delivered to ring control module in the current corresponding; After comparing with above-mentioned switching tube dutyfactor value signal; Obtain the PWM triggering signal, as the drive control signal of booster circuit unit switch pipe.
Further improvement as the another kind of technical scheme of a kind of energy feedback type diesel engine of the invention described above experimental rig; Energy feedback type diesel engine experimental rig comprises the combining inverter control module; The combining inverter control module comprises outer voltage control module and current inner loop control module; The outer voltage control module comprises the 4th PI regulon, the 4th equal subdivision and the 5th sampling filter unit; The 5th sampling filter unit is gathered the DC side output voltage signal of combining inverter and is exported in the 4th PI regulon; And with target voltage in the 4th PI regulon, compare regulate with PI after, output total current set-point exports the active current instruction value signal of combining inverter as every heavy converter cell to after being divided into the n equal portions through the 4th equal subdivision; The current inner loop control module comprises the 3rd PI regulon, the 4th PI regulon, coordinate transformation unit, phase locked-loop unit, the 3rd sampling filter unit, the 4th sampling filter unit and phase-shifting carrier wave sinusoidal pulse width modulation unit; The be incorporated into the power networks ac current signal of input winding of transformer of the 3rd sampling filter unit collection; And export coordinate transformation module to; The ac voltage signal of the converter cell of combining inverter is gathered in the 4th sampling filter unit; Through exporting coordinate transformation unit to behind the phase locked-loop unit calculating voltage phase angle; Obtain the active component of current and the reactive component of current, compare with active current set-point and reactive current set-point respectively, difference compares, obtains the modulating wave instruction value signal after adjusting and the computing through the 3rd PI regulon and the 4th PI regulon respectively; The modulating wave command signal obtains the start pulse signal of converter cell switching device behind phase-shifting carrier wave sinusoidal pulse width modulation unit, and exports it converter cell of combining inverter to.
Through implementing the technical scheme of a kind of energy feedback type diesel engine of the invention described above experimental rig, have following technique effect:
(1) can send the output energy in the diesel engine load test process back to electrical network, avoid energy waste greatly;
(2) the electronic power convertor group based on turn-off device does not produce great amount of heat, a series of problems such as ring control of having avoided test place ambient temperature to raise and bring;
(3) do not have slewing, take up an area of little, maintenance workload and can significantly reduce;
(4) very little to electric network pollution, power factor can be near unity power factor.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is prior art 1 a thyristor active inverter scheme system architecture diagram;
Fig. 2 is the system architecture diagram of prior art 2 novel diesel generating sets test with Energy Feedback System;
Fig. 3 is the functional block diagram of a kind of embodiment of energy feedback type diesel engine experimental rig of the present invention;
Fig. 4 is the circuit theory diagrams of a kind of embodiment booster circuit of energy feedback type diesel engine experimental rig of the present invention unit;
Fig. 5 is the model structure circuit diagram of a kind of embodiment converter cell of energy feedback type diesel engine experimental rig of the present invention;
Fig. 6 is that energy feedback type diesel engine experimental rig converter cell of the present invention operates in the schematic vector diagram under the pure inductance trait model;
Fig. 7 is that energy feedback type diesel engine experimental rig converter cell of the present invention operates in the schematic vector diagram under the unit power rectification pattern;
Fig. 8 is that energy feedback type diesel engine experimental rig converter cell of the present invention operates in the schematic vector diagram under the pure capacitance characteristic pattern;
Fig. 9 is that energy feedback type diesel engine experimental rig converter cell of the present invention operates in the schematic vector diagram under the unit power inverter mode;
Figure 10 is the circuit theory diagrams of a kind of embodiment DC booster converter of energy feedback type diesel engine experimental rig of the present invention;
Figure 11 is the functional block diagram of a kind of embodiment DC booster converter of energy feedback type diesel engine experimental rig of the present invention outer voltage control module;
Figure 12 is the functional block diagram of a kind of embodiment DC booster converter of energy feedback type diesel engine experimental rig of the present invention current inner loop control module;
Figure 13 is the functional block diagram of the given module of energy feedback type diesel engine experimental rig a kind of embodiment combining inverter active current of the present invention;
Figure 14 is the functional block diagram of the given module of energy feedback type diesel engine experimental rig a kind of embodiment DC booster converter average current of the present invention;
Figure 15 is the functional block diagram of a kind of embodiment combining inverter of energy feedback type diesel engine experimental rig of the present invention current inner loop control module;
Figure 16 is the functional block diagram of a kind of embodiment combining inverter of energy feedback type diesel engine experimental rig of the present invention outer voltage control module;
Among the figure, 1-rectifier, 2-DC booster converter, 3-combining inverter, the 4-transformer that is incorporated into the power networks; The 5-switch cubicle, 6-diesel engine, 7-synchronous generator, the 8-first sampling filter unit, 9-the-PI regulon; The 10-first equal subdivision, the 11-second sampling filter unit, 12-mean value is asked for the unit, and 13-second regulates PI unit, 14-amplitude limit unit; The 15-triangular carrier forms the unit, and 16-first loads setup unit transit time, the 17-first active current stable state set-point computing unit, 18-active current set-point computing unit, the 19-second equal subdivision; 20-second loads setup unit transit time, the 21-second active current stable state set-point computing unit, 22-active current set-point computing unit, 23-the 3rd equal subdivision; 24-the 3rd sampling filter unit, 25-the 4th sampling filter unit, 26-phase locked-loop unit, 27-coordinate transformation unit; 28-the 3rd regulates the PI unit, 29-the 4th PI regulon, the sinusoidal pulse width unit of 30-phase-shifting carrier wave, 31-converter cell; 32-the 5th sampling filter unit, 33-the 5th PI regulon, 34-the 4th equal subdivision, 35-booster circuit unit.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Shown in accompanying drawing 3 to 16, provided the specific embodiment of a kind of energy feedback type diesel engine of the present invention experimental rig, below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
The embodiment of a kind of energy feedback type diesel engine experimental rig shown in accompanying drawing 3 comprises: rectifier 1, DC booster converter 2, combining inverter 3 and the transformer 4 that is incorporated into the power networks, rectifier 1 further adopts the uncontrollable rectifier of diode.The input of the uncontrollable rectifier of diode connects diesel engine 6 through synchronous generator 7; The output of the uncontrollable rectifier of diode links to each other with DC booster converter 2; DC booster converter 2 links to each other with combining inverter 3; Combining inverter 3 links to each other with the input of the transformer 4 that is incorporated into the power networks; The output of transformer 4 of being incorporated into the power networks links to each other with electrical network through switch cubicle 5, and when carrying out diesel engine 6 tests, diesel engine 6 drive synchronous generators 7 send the alternating current of frequency and magnitude; Become direct current through the uncontrollable rectifier rectification of diode, more successively through DC booster converter 2, combining inverter 3, be incorporated into the power networks transformer 4 and switch cubicle 5 with the power delivery of diesel engine unit output to electrical network.
Wherein, the inlet of experimental rig is the outlet of synchronous generator 7, and the outlet of device is connected to electrical network through switch cubicle 5 (Switch Gear).Diesel engine 6 is a tested device.Diesel engine 6 is formed diesel generating set with synchronous generator 7.
The function of main each several part is following:
1, the uncontrollable rectifier of diode (Rectifier)
To be become easy-to-handle direct voltage by the size of examination diesel engine 6 place diesel generating set outputs, the voltage transformation of frequency change, to the energy of DC booster converter transmission diesel engine 6 outputs.
2, DC booster converter (Boost DC-DC Converter)
For diesel engine 6 (Diesel); Because when under different rotating speeds, different loading power, testing; Diesel generating set (Diesel Generating Set) is very wide through the regulation of line voltage of the uncontrollable rectifier output of diode, can be for combining inverter 3 provides reliably, galvanic current through DC booster converter 2.
3, combining inverter (Grid Inverter)
The power output that DC booster converter 2 is transmitted the diesel engine 6 that comes is the alternating current of frequency, phase place and amplitude appropriate from the DC link inversion, and is fed to public electric wire net through the transformer 4 that is incorporated into the power networks.Consider the problem of the capacity and the quality of power supply, generally speaking, adopt combining inverter 4 will adopt multipleization scheme (less, and the quality of power supply also can adopt the substance structure can guarantee the time) at capacity.
4, the transformer (IT) that is incorporated into the power networks
Combining inverter 4 is a time limit multiple secondary winding, cooperates multipleization of front end combining inverter 3 to constitute transformer-coupled multipleization current transformer.In addition, as the link of guarantee test appliance arrangement safety, this transformer 4 that is incorporated into the power networks is at public electric wire net and testing equipment and tried to provide between the diesel engine 6 necessary isolation.The former limit winding connection method of transformer 4 of being incorporated into the power networks adopts triangular form to connect method, can guarantee that the high-pressure side is that in the winding of former limit three times and three multiple subharmonic do not get into utility network.
5, switch cubicle (Switch Gear)
As the access switch that is incorporated into the power networks, switch cubicle 5 is done the purposes of protection for feed line and electric energy metrical.
The uncontrollable rectifier of diode further adopts three-phase bridge rectifier, and the size of synchronous generator 7 outputs and the AC voltage conversion of frequency change are become direct voltage, the energy of exporting to DC booster converter 2 transmission diesel engines 6 simultaneously; DC booster converter 2 provides the galvanic current source for combining inverter 3; Combining inverter 3 is alternating current with the power output that DC booster converter 2 transmits the diesel engine 6 that comes from the direct voltage inversion, is fed back to electrical network through the transformer 4 that is incorporated into the power networks, and between diesel engine 6 and electrical network, isolation is provided.Combining inverter 3 adopts multiple inverter configuration, and combining inverter 3 comprises two groups or more converter cell parallel with one another 31.The transformer 4 that is incorporated into the power networks further adopts multiple input winding construction; The transformer 4 that is incorporated into the power networks comprises the input winding that two groups or more is identical with converter cell 31 quantity of combining inverter 3, and each output of the converter cell 31 of combining inverter 3 links to each other with one of the transformer 4 that is incorporated into the power networks corresponding input winding.
Shown in accompanying drawing 5; The converter cell 31 of combining inverter 3 further adopts four-quadrant voltage-source type PWM (Pulse Width Modulation; Pulse width modulation) current transformer; The converter cell 31 of combining inverter 3 runs on unity power factor active inversion state, and converter cell 31 comprises AC side inductance and switching device.The core converter cell 31 of combining inverter 3 adopts four-quadrant voltage-source type PWM current transformer; The type current transformer has power bi-directional and flows and the controlled characteristic of power factor; When current transformer during to the electrical network feedback electric energy; System runs on the active inversion state, when current transformer when electrical network is drawn electric energy, it runs on rectification state.
Shown in accompanying drawing 5, be the model circuit diagram of PWM current transformer.Do not consider the switching loss of current transformer itself, can obtain by the power-balance principle:
ui＝u
dci
dc (1.1)
U, i, u in the formula (1.1)
Dc, i
DcBe respectively AC side voltage in the precircuit, ac-side current, dc voltage and direct current and survey electric current.Visible by formula (3.1): as, just can to control its direct current and survey through the AC side of controlling models circuit; Otherwise the DC side of controlling models circuit can be realized the control of its AC side equally.
Under the lower state, ignore AC side resistance and PWM harmonic component, then the vector correlation of PWM AC side of converter can be represented with Fig. 7.Get the voltage on line side source voltage vector U of current transformer
iBe reference vector oo ', suppose that the DC side load of current transformer is constant, then the current phasor I of AC side of converter is also constant, therefore | and U
L|=ω L|I| immobilizes equally, and at this moment the end points movement locus of AC side voltage vector U has constituted one with | U
L| be the circle of radius, control vector U drops on the zones of different of this circle, just can realize the four quadrant running of current transformer, shown in accompanying drawing 6 to 9 and table 2.
Table 2PWM current transformer four quadrant running state table
In energy feedback type diesel engine experimental rig, the converter cell 31 of combining inverter 3 is operated in unity power factor active inversion state.
Shown in accompanying drawing 10; DC booster converter 2 further adopts a heavy or heavy above booster circuit unit 35 parallel connection formations; Booster circuit unit 35 adopts Boost type DC/DC booster circuit; The variable dc voltage conversion of amplitude that is used for the uncontrollable rectifier output of diode is that galvanic current presses confession combining inverter 3 to use, and booster circuit unit 35 comprises boost inductance, fly-wheel diode, switching tube and DC side output capacitance.It is direct voltage confession combining inverter 3 uses of higher stable that DC booster converter 2 is used for the variable dc voltage conversion of amplitude of the uncontrollable rectifier output of diode; It weighs by one or the unit parallel connection of multiple basic Boost type DC/DC booster circuit constitutes, and every heavy structural representation is as shown in Figure 4.U
iBe input voltage, U
OBe output voltage.L is a direct current reactor; The switching tube of Q for turn-offing; As: IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), IGCT (Integrated Gate-Commutated Thyristor, integrated gate commutated thyristor) etc.; D is a fly-wheel diode, and C is a direct current outlet side electric capacity.
Operation principle is following: when switching tube Q conducting, inductive current increases, energy storage increases, and this moment, the voltage at inductance two ends was U
i＞0, and load supplied power by capacitor, and the circuit input side does not provide energy to load.After this when switching tube Q turn-offs, because inductive current can not suddenly change, so electric current will provide energy to the capacitor C charging and to load through sustained diode, and inductive energy storage is delivered to electric capacity, load-side, this moment U
O=U
i-U
L, owing to inductive current is reducing, so U
O＞0, so U
O＞U
i
As a kind of embodiment of the present invention, energy feedback type diesel engine experimental rig further comprises the DC booster converter control module, and the DC booster converter control module comprises outer voltage control module and current inner loop control module.Shown in accompanying drawing 11; The outer voltage control module comprises the first sampling filter unit 8, a PI regulon 9 and the first equal subdivision 10; The first sampling filter unit 8 is gathered DC booster converter 2 output voltages and is exported in the PI regulon 9; And with target voltage in a PI regulon 9, compare regulate with PI after; Output total current set-point exports boost inductance average current set-point or the fly-wheel diode average current set-point of DC booster converter 2 as every heavy booster circuit unit 35 to after being divided into the n equal portions through the first equal subdivision 10.Shown in accompanying drawing 12; The current inner loop control module comprises that the 2nd PI regulon 13, amplitude limit unit 14, triangular carrier form unit 15, the second sampling filter unit 11 and mean value and ask for unit 12; The second sampling filter unit, 11 collection boost inductance real-time current signals export to and export the 2nd PI regulon 13 to after mean value is asked for unit 12 averaged; Compare in the 2nd PI regulon 13 with boost inductance average current set-point and to export the switching tube dutyfactor value signal that amplitude limit unit 14 obtains every heavy booster circuit unit 35 to after regulating with PI; Triangular carrier forms unit 15 produces the mutual phasing identical with this tuple according to the tuple of DC booster converter 2 multichannel triangular carrier; Every road triangular carrier is delivered to ring control module in the current corresponding; After comparing with above-mentioned switching tube dutyfactor value signal, obtain the PWM triggering signal, as the drive control signal of booster circuit unit 35 switching tubes.
On the basis of above-mentioned embodiment, energy feedback type diesel engine experimental rig comprises the combining inverter control module, and the combining inverter control module further comprises given module of active current and current inner loop control module.Shown in accompanying drawing 13; The given module of active current comprises that first loads setup unit 16 transit time, active current stable state set-point computing unit 17, active current set-point computing unit 18 and the second equal subdivision 19; Test required loading power signal and input to first loading setup unit transit time 16; Obtain active current stable state set-point signal through active current stable state set-point computing unit 17 again, obtain the active current set-point signal of combining inverter 3 every heavy converter cells 31 in the next control cycle through active current set-point the computing unit 18 and second equal subdivision 19.Shown in accompanying drawing 14; The current inner loop control module comprises the 3rd PI regulon 28, the 4th PI regulon 29, coordinate transformation unit 27, phase locked-loop unit 26, the 3rd sampling filter unit 24, the 4th sampling filter unit 25 and phase-shifting carrier wave sinusoidal pulse width modulation unit 30; The ac current signal of the input winding of the transformer 4 that is incorporated into the power networks is gathered in the 3rd sampling filter unit 24; And export coordinate transformation module 27 to; The ac voltage signal of the converter cell 31 of combining inverter 3 is gathered in the 4th sampling filter unit 25; Through exporting coordinate transformation unit 27 to behind the phase locked-loop unit 26 calculating voltage phase angles; Obtain the active component of current and the reactive component of current, compare with active current set-point and reactive current set-point respectively, difference compares, obtains the modulating wave instruction value signal after adjusting and the computing through the 3rd PI regulon 28 and the 4th PI regulon 29 respectively; The modulating wave command signal obtains the start pulse signal of converter cell 31 switching devices behind phase-shifting carrier wave sinusoidal pulse width modulation unit 30, and exports it converter cell 31 of combining inverter 3 to.
As another kind of embodiment of the present invention, energy feedback type diesel engine experimental rig further comprises the DC booster converter control module, and the DC booster converter control module comprises given module of average current and current inner loop control module.Shown in accompanying drawing 15; The given module of average current comprises that second loads setup unit 20 transit time, average current stable state set-point computing unit 21, average current set-point computing unit 22 and the 3rd equal subdivision 23; Test required loading power signal and input to second loading setup unit transit time 20; Obtain the average current stable state set-point signal of every heavy DC booster converter 2 again through average current stable state set-point computing unit 21; Export average current set-point computing unit 22 to, carry out the n equation through the 3rd equal subdivision 23 again after, obtain the average current set-point signal of booster converter 2 every heavy booster circuit unit 35.Shown in accompanying drawing 12; The current inner loop control module comprises that the 2nd PI regulon 13, amplitude limit unit 14, triangular carrier form unit 15, the second sampling filter unit 11 and mean value and ask for unit 12; The second sampling filter unit, 11 collection boost inductance real-time current signals export to and export the 2nd PI regulon 13 to after mean value is asked for unit 12 averaged; Compare in the 2nd PI regulon 13 with boost inductance average current set-point and to export the switching tube dutyfactor value signal that amplitude limit unit 14 obtains every heavy booster circuit unit 35 to after regulating with PI; Triangular carrier forms unit 15 produces the mutual phasing identical with this tuple according to the tuple of DC booster converter 2 multichannel triangular carrier; Every road triangular carrier is delivered to ring control module in the current corresponding; After comparing with above-mentioned switching tube dutyfactor value signal, obtain the PWM triggering signal, as the drive control signal of booster circuit unit 35 switching tubes.
On the basis of above-mentioned another kind of embodiment, energy feedback type diesel engine experimental rig further comprises the combining inverter control module, and the combining inverter control module comprises outer voltage control module and current inner loop control module.Shown in accompanying drawing 16; The outer voltage control module comprises the 4th PI regulon the 33, the 4th equal subdivision 34 and the 5th sampling filter unit 32; The 5th sampling filter unit is gathered the DC side output voltage signal of combining inverter 3 and is exported in the 4th PI regulon 33; And with target voltage in the 4th PI regulon 33, compare regulate with PI after; Output total current set-point exports the active current instruction value signal of combining inverter 3 as every heavy converter cell 31 to after being divided into the n equal portions through the 4th equal subdivision 34.Shown in accompanying drawing 14; The current inner loop control module comprises the 3rd PI regulon 28, the 4th PI regulon 29, coordinate transformation unit 27, phase locked-loop unit 26, the 3rd sampling filter unit 24, the 4th sampling filter unit 25 and phase-shifting carrier wave sinusoidal pulse width modulation unit 30; The ac current signal of the input winding of the transformer 4 that is incorporated into the power networks is gathered in the 3rd sampling filter unit 24; And export coordinate transformation module 27 to; The ac voltage signal of the converter cell 31 of combining inverter 3 is gathered in the 4th sampling filter unit 25; Through exporting coordinate transformation unit 27 to behind the phase locked-loop unit 26 calculating voltage phase angles; Obtain the active component of current and the reactive component of current, compare with active current set-point and reactive current set-point respectively, difference compares, obtains the modulating wave instruction value signal after adjusting and the computing through the 3rd PI regulon 28 and the 4th PI regulon 29 respectively; The modulating wave command signal obtains the start pulse signal of converter cell 31 switching devices behind phase-shifting carrier wave sinusoidal pulse width modulation unit 30, and exports it converter cell 31 of combining inverter 3 to.
Aspect the method that the described energy feedback type diesel engine of specific embodiment of the invention experimental provision is controlled; The control method of device mainly comprises two major parts; The one, the strategy that DC booster converter 2 is controlled, the 2nd, the strategy that combining inverter 3 is controlled.The controlled target of device can be decomposed into two: the loading power of the dc voltage of combining inverter 3 and diesel engine 6.Bearing main body and can be divided into two kinds of control strategies according to above-mentioned two controlled target:
(1) dc voltage of DC booster converter 2 control combining inverters 3, the loading power of combining inverter 3 control diesel engines 6;
(2) the loading power of DC booster converter 2 control diesel engines 6, the dc voltage of combining inverter 3 control combining inverters 3.
Corresponding above-mentioned two kinds of control strategies are set forth it as follows respectively:
1, DC booster converter 2 control combining inverters 3 dc voltages, combining inverter 3 control diesel engines 6 load power;
(1) DC booster converter control method
In view of large-scale diesel engine is tested power up to number MW, so DC booster converter 2 is taked the structure of multipleization.For the control of multipleization DC booster converter, device adopts the structure of ring in common voltage outer shroud, the separate current, and its control block diagram is shown in accompanying drawing 11 and 12.
The controlled target of DC booster converter 2 is pressed output dc voltage U
OBe the set point closed-loop control, through real-time detection DC booster converter output voltage U
O, and with target voltage U
RefCompare output total current set-point I after proportional integral (pi regulator) is regulated
Ref_TOT, with I
Ref_TOTBe divided into the n equal portions and promptly become every heavy converter boost inductance average current set-point or fly-wheel diode average current set-point I
Ref, it and the boost inductance current i that detects in real time
LMean value compare, through pi regulator regulate, the amplitude limit link obtains switching tube Q
i(i=1,2 ... .., dutyfactor value Duty n), duty ratio and triangular carrier relatively obtain the PWM triggering signal, as the drive control signal of IGBT then.It is pointed out that input, output current ripple content in order to reduce booster circuit, in the generative circuit of the PWM drive signal of each unit IGBT, triangular wave (carrier wave) adopts carrier wave misphase technology.
(2) combining inverter control strategy
Combining inverter 3 is accomplished the loading of diesel engine test power demand, is controlled under the situation of desired value by DC booster converter 2 at DC bus-bar voltage, and the controlled target of combining inverter 3 is electric currents of converter cell 31.Adopt four-quadrant PWM current transformer Direct Current Control mode, converter cell 31 output active current components and reactive current component are carried out closed-loop control, thereby realize the unity power factor active inversion.
Same; Combining inverter 3 for multipleization; The active current command value of every heavy PWM current transformer adopts open loop approach given; The referenced reactive current value is constantly equal to " 0 "; The given module frame chart of active current command value is shown in accompanying drawing 13; The given module of active current through the required loading power P of test calculate total active current stable state set-point
afterwards according to the loading of setting confirm that the set-point
of every heavy current transformer active current in the next control cycle needs to do explanation slightly transit time be that to load transit time be exactly the combining inverter power output from 0 be increased to the test power demand time,
in addition
After obtaining the active power command value, will have, the reactive current closed-loop control, control block diagram shown in accompanying drawing 14.
Specific practice is following:
A. detect k and net top-cross stream voltage and current constantly, and it is carried out bandpass filtering, filtered voltage is sent into and is calculated the electric network voltage phase angle in the software phase-lock loop (PLL).Filtered electric current then obtains corresponding k current on line side real component i constantly through coordinate transform
dWith idle component i
qWhat need to prove the voltage on line side collection here is multipleization transformer original edge voltage, just line voltage.
B. real component i
d, idle component i
q, respectively with the active current set-point
The reactive current set-point
Relatively, its difference obtains k+1 modulating wave command value V constantly through pi regulator and the control algolithm that is shown below
d, V
q
i
d, i
q---current on line side under the synchronous rotating frame;
e
d, e
q---line voltage under the synchronous rotating frame;
V
d, V
q---rectifier voltage on line side under the synchronous rotating frame;
v
Dc---dc voltage.
C. modulating wave command value V
d, V
qThe trigger impulse that output PWM four quadrant convertor is used after the phase-shifting carrier wave sinusoidal pulse width modulation.
2, DC booster converter 2 control diesel engines 6 load power, combining inverter 3 control combining inverters 3 dc voltages.
(1) DC booster converter control
Be with preceding a kind of control method difference; Under this control strategy; The controlled target of DC booster converter 2 is the loading power of diesel engine 6; Under the precondition that the dc voltage of combining inverter 3 self is controlled by combining inverter 3, its controlled target is exactly the average current of DC booster converter 2, or the closed-loop control of fly-wheel diode average current.Therefore compare with preceding a kind of control strategy, just I
RefAcquisition methods is different; The former obtains total DC boosting reactor average current or fly-wheel diode average current through the mode that Voltage loop PI regulates with closed loop; The latter then utilizes the required loading power of test to calculate with the mode of open loop, specifically controls block diagram shown in accompanying drawing 15.
At first setting loads transit time, and utilizes the required loading power P of test to calculate every heavy DC booster converter average current stable state set-point I
Ref_TOT, confirm transit time according to the loading of setting afterwards the set-point of average current in the next control cycle can obtain every heavy converter average current set-point I behind the branches such as n
Ref
Need to prove:
If adopt the reactor average current to do closed-loop control, I then arranged
Ref_TOT=P/ (U
In* n), U
InBe DC booster converter input voltage mean value;
If adopt the fly-wheel diode average current to do closed-loop control, I then arranged
Ref_TOT=P/ (U
O* n), U
OBeing the DC booster converter output voltage average value, also is the dc voltage mean value of parallel network reverse 3;
After obtaining the average current command value, carry out corresponding average current closed-loop control, control block diagram with before a kind of strategy the same, shown in accompanying drawing 12.
(2) combining inverter control strategy
In this kind control strategy, combining inverter 3 mainly is responsible for stablizing its dc voltage, and under the situation that loading power has been controlled by DC booster converter 2, direct voltage outer shroud, two closed-loop control strategies of current inner loop are adopted in its control.
Adopt four-quadrant PWM current transformer Direct Current Control mode, converter cell 31 output active current components and reactive current component are carried out closed-loop control, thereby realize the unity power factor active inversion.Being that with different supports before the active current command value
of every heavy PWM current transformer adopts closed-loop fashion given, is the output of direct voltage closed-loop regulator.
For multipleization combining inverter,, therefore adopt the control mode of ring in public direct current side outer voltage, the separate current because dc bus is heavy public for each.Outer voltage control block diagram is shown in accompanying drawing 16.
After obtaining the active power command value, will have, the reactive current closed-loop control, control block diagram with before a kind of control strategy the same, shown in accompanying drawing 14.
The described energy feedback type diesel engine of specific embodiment of the invention experimental provision can be implemented by following concrete steps:
(1) when test, at first select pilot project, this pilot project has comprised the parameters such as output voltage range and test power of rotating speed, the uncontrollable rectifier of diode of the diesel engine 6 of test;
(2) start diesel engine 6, and make it be operated in test speed;
(3) regulate synchronous generator 7, make the uncontrollable rectifier output voltage of diode be in this test corresponding voltage scope;
(4) be loaded on required test power gradually through man-machine interface firing test loading procedure; The intermediate dc link absorbs energy and it is delivered to the DC side of combining inverter 3 from diesel engine 6 when load test; 3 of combining inverters absorb energy and it are delivered to electrical network from middle DC link, thereby reach the recycling of diesel engine 6 power outputs;
(5) stop energy feedback type diesel engine experimental provision net side feedback energy through man-machine interface after the off-test, thereby realize unloading.
The described energy feedback type diesel engine of specific embodiment of the invention experimental provision adds the DC boosting link of stablizing combining inverter 3 dc voltages in order in the scope of broad, to realize by the energy feedback of examination diesel engine 6 between uncontrollable rectifier of diode and combining inverter 3; The harmonic current system of injecting utility network when reducing feedback adopts multipleization combining inverter and the multipleization transformer that is incorporated into the power networks, and guarantees the quality of power supply through phase-shifting carrier wave control; Multipleization DC booster converter and multipleization combining inverter have been adopted for guaranteed capacity.
The technique effect that the described energy feedback type diesel engine of specific embodiment of the invention experimental provision is produced is mainly reflected in:
(1) the present invention adopts the switching device of turn-off devices such as IGBT, IGCT as converter cell 31; Switching device is opened the harmonic wave that turn-off to produce and is compared thyristor class half control device reducing on the order of magnitude arranged; Adopt multipleization in addition; The harmonic wave composition that electric energy comprised that feeds back to transformer 4 primary sides that are incorporated into the power networks during device busy is little with non-product, can be relatively easy to satisfy country and IEC relevant criterion;
(2) net side power factor of the present invention can reach or near unity power factor, and this has great lifting when adopting thyristor active inversion system, and the work of thyristor active inverter will absorb a large amount of idle from electrical network, cause net side power factor very low;
(3) the present invention compares with traditional energy-dissipating type test method; Can send the output energy in the diesel engine load test process back to electrical network; Avoided energy waste greatly; Simultaneously little, as to have avoided test place ambient temperature to raise and bring a series of problems such as environment control based on the converter cell oneself power consumption of turn-off device;
(4) the present invention compares with conventional rack type test method, does not have slewing, takes up an area of little, maintenance workload and can significantly reduce;
(5) the present invention adopts triangular form to connect method in the former edge joint method of the transformer 4 that is incorporated into the power networks, and can guarantee that the high-pressure side is that in the winding of former limit three times and three multiple subharmonic do not get into utility network.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art; Do not breaking away under the technical scheme scope situation of the present invention; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to technical scheme of the present invention, or are revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical scheme of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, be equal to replacement, equivalence changes and modify, all still belong in the scope that technical scheme of the present invention protects.
Claims (10)
1. energy feedback type diesel engine experimental rig; It is characterized in that; Comprise: rectifier (1), DC booster converter (2), combining inverter (3) and the transformer that is incorporated into the power networks (4); The input of said rectifier (1) connects diesel engine (6) through synchronous generator (7); The output of rectifier (1) links to each other with the transformer that is incorporated into the power networks (4), and the transformer that is incorporated into the power networks (4) links to each other with DC booster converter (2), and DC booster converter (2) links to each other with combining inverter (3); Combining inverter (3) links to each other with the input of the transformer that is incorporated into the power networks (4); The output of transformer (4) of being incorporated into the power networks links to each other with electrical network through switch cubicle (5), and when carrying out diesel engine (6) test, diesel engine (6) drive synchronous generator (7) sends the alternating current of frequency and magnitude; Become direct current through rectifier (1) rectification, more successively through DC booster converter (2), combining inverter (3), the transformer that is incorporated into the power networks (4) and switch cubicle (5) with the power delivery of diesel engine unit output to electrical network.
2. a kind of energy feedback type diesel engine experimental rig according to claim 1; It is characterized in that: described rectifier (1) adopts the uncontrollable rectifier of diode; The size of synchronous generator (7) output and the AC voltage conversion of frequency change are become direct voltage, the energy of exporting to DC booster converter (2) transmission diesel engine (6) simultaneously; DC booster converter (2) provides the galvanic current source for combining inverter (3); Combining inverter (3) is alternating current with the power output of the diesel engine (6) that DC booster converter (2) transmission is come from the direct voltage inversion; Be fed back to electrical network through the transformer that is incorporated into the power networks (4); Transformer (4) be incorporated into the power networks simultaneously at electrical network and experimental rig, and electrical isolation be provided by between the diesel engine (6) that tries.
3. a kind of energy feedback type diesel engine experimental rig according to claim 1 and 2; It is characterized in that: described combining inverter (3) adopts multiple inverter configuration, and combining inverter (3) comprises two groups or more converter cell parallel with one another (31).
4. a kind of energy feedback type diesel engine experimental rig according to claim 3; It is characterized in that: the described transformer that is incorporated into the power networks (4) adopts multiple input winding construction; The transformer (4) that is incorporated into the power networks comprises two groups or more and the identical input winding of converter cell (31) quantity of combining inverter (3), and each output of the converter cell (31) of said combining inverter (3) links to each other with one of the transformer that is incorporated into the power networks (4) corresponding input winding.
5. a kind of energy feedback type diesel engine experimental rig according to claim 3; It is characterized in that: the converter cell (31) of described combining inverter (3) adopts four-quadrant voltage-source type PWM current transformer; The converter cell (31) of described combining inverter (3) runs on unity power factor active inversion state, and described converter cell (31) comprises AC side inductance and switching device.
6. according to claim 4 or 5 described a kind of energy feedback type diesel engine experimental rigs; It is characterized in that: described DC booster converter (2) adopts heavy or heavy above booster circuit unit (a 35) parallel connection formation; Described booster circuit unit (35) adopts Boost type DC/DC booster circuit; The variable dc voltage conversion of amplitude that is used for the uncontrollable rectifier of diode (1) output is that galvanic current presses confession combining inverter (3) to use, and described booster circuit unit (35) comprises boost inductance, fly-wheel diode, switching tube and DC side output capacitance.
7. according to the described a kind of energy feedback type diesel engine experimental rig of arbitrary claim in the claim 1,2,4,5; It is characterized in that: described energy feedback type diesel engine experimental rig comprises the DC booster converter control module; Described DC booster converter control module comprises outer voltage control module and current inner loop control module; Described outer voltage control module comprises the first sampling filter unit (8), a PI regulon (9) and the first equal subdivision (10); The first sampling filter unit (8) is gathered DC booster converter (2) output voltage and is exported in the PI regulon (9); And with target voltage in a PI regulon (9), compare regulate with PI after; Output total current set-point exports boost inductance average current set-point or the fly-wheel diode average current set-point of DC booster converter (2) as every heavy booster circuit unit (35) to after being divided into the n equal portions through the first equal subdivision (10); Described current inner loop control module comprises that the 2nd PI regulon (13), amplitude limit unit (14), triangular carrier form unit (15), the second sampling filter unit (11) and mean value and ask for unit (12); The second sampling filter unit (11) collection boost inductance real-time current signal exports to and exports the 2nd PI regulon (13) to after mean value is asked for unit (12) averaged; Compare in the 2nd PI regulon (13) with boost inductance average current set-point and to export the switching tube dutyfactor value signal that amplitude limit unit (14) obtains every heavy booster circuit unit (35) to after regulating with PI; Triangular carrier forms unit (15) produces the mutual phasing identical with this tuple according to the tuple of DC booster converter (2) multichannel triangular carrier; Every road triangular carrier is delivered to ring control module in the current corresponding; After comparing with above-mentioned switching tube dutyfactor value signal; Obtain the PWM triggering signal, as the drive control signal of booster circuit unit (35) switching tube.
8. a kind of energy feedback type diesel engine experimental rig according to claim 7; It is characterized in that: described energy feedback type diesel engine experimental rig comprises the combining inverter control module; Described combining inverter control module comprises given module of active current and current inner loop control module; The given module of described active current comprises that first loads setup unit transit time (16), active current stable state set-point computing unit (17), active current set-point computing unit (18) and the second equal subdivision (19); Test required loading power signal and input to first loading setup unit transit time (16); Pass through active current stable state set-point computing unit (17) again and obtain active current stable state set-point signal, the process active current set-point computing unit (18) and the second equal subdivision (19) obtain the active current set-point signal of the every heavy converter cell of combining inverter (3) (31) in the next control cycle; Described current inner loop control module comprises the 3rd PI regulon (28), the 4th PI regulon (29), coordinate transformation unit (27), phase locked-loop unit (26), the 3rd sampling filter unit (24), the 4th sampling filter unit (25) and phase-shifting carrier wave sinusoidal pulse width modulation unit (30); The ac current signal of the input winding of the transformer (4) that is incorporated into the power networks is gathered in the 3rd sampling filter unit (24); And export coordinate transformation module (27) to; The ac voltage signal of the converter cell (31) of combining inverter (3) is gathered in the 4th sampling filter unit (25); Through exporting coordinate transformation unit (27) to behind phase locked-loop unit (26) the calculating voltage phase angle; Obtain the active component of current and the reactive component of current; Compare with active current set-point and reactive current set-point respectively; Difference compares, obtains the modulating wave instruction value signal after adjusting and the computing through the 3rd PI regulon (28) and the 4th PI regulon (29) respectively; The modulating wave command signal obtains the start pulse signal of converter cell (31) switching device behind phase-shifting carrier wave sinusoidal pulse width modulation unit (30), and exports it converter cell (31) of combining inverter (3) to.
9. according to claim 1,2,4,5 described a kind of energy feedback type diesel engine experimental rigs; It is characterized in that: described energy feedback type diesel engine experimental rig comprises the DC booster converter control module; Described DC booster converter control module comprises given module of average current and current inner loop control module; The given module of described average current comprises that second loads setup unit transit time (20), average current stable state set-point computing unit (21), average current set-point computing unit (22) and the 3rd equal subdivision (23); Test required loading power signal and input to second loading setup unit transit time (20); Pass through the average current stable state set-point signal that average current stable state set-point computing unit (21) obtains every heavy DC booster converter (2) again; Export average current set-point computing unit (22) to; After carrying out the n equation through the 3rd equal subdivision (23) again, obtain the average current set-point signal of booster converter (2) every heavy booster circuit unit (35); Described current inner loop control module comprises that the 2nd PI regulon (13), amplitude limit unit (14), triangular carrier form unit (15), the second sampling filter unit (11) and mean value and ask for unit (12); The second sampling filter unit (11) collection boost inductance real-time current signal exports to and exports the 2nd PI regulon (13) to after mean value is asked for unit (12) averaged; Compare in the 2nd PI regulon (13) with boost inductance average current set-point and to export the switching tube dutyfactor value signal that amplitude limit unit (14) obtains every heavy booster circuit unit (35) to after regulating with PI; Triangular carrier forms unit (15) produces the mutual phasing identical with this tuple according to the tuple of DC booster converter (2) multichannel triangular carrier; Every road triangular carrier is delivered to ring control module in the current corresponding; After comparing with above-mentioned switching tube dutyfactor value signal; Obtain the PWM triggering signal, as the drive control signal of booster circuit unit (35) switching tube.
10. a kind of energy feedback type diesel engine experimental rig according to claim 9; It is characterized in that: described energy feedback type diesel engine experimental rig comprises the combining inverter control module; Described combining inverter control module comprises outer voltage control module and current inner loop control module; Described outer voltage control module comprises the 4th PI regulon (33), the 4th equal subdivision (34) and the 5th sampling filter unit (32); The 5th sampling filter unit is gathered the DC side output voltage signal of combining inverter (3) and is exported in the 4th PI regulon (33); And with target voltage in the 4th PI regulon (33), compare regulate with PI after; Output total current set-point exports the active current instruction value signal of combining inverter (3) as every heavy converter cell (31) to after being divided into the n equal portions through the 4th equal subdivision (34); Described current inner loop control module comprises the 3rd PI regulon (28), the 4th PI regulon (29), coordinate transformation unit (27), phase locked-loop unit (26), the 3rd sampling filter unit (24), the 4th sampling filter unit (25) and phase-shifting carrier wave sinusoidal pulse width modulation unit (30); The ac current signal of the input winding of the transformer (4) that is incorporated into the power networks is gathered in the 3rd sampling filter unit (24); And export coordinate transformation module (27) to; The ac voltage signal of the converter cell (31) of combining inverter (3) is gathered in the 4th sampling filter unit (25); Through exporting coordinate transformation unit (27) to behind phase locked-loop unit (26) the calculating voltage phase angle; Obtain the active component of current and the reactive component of current; Compare with active current set-point and reactive current set-point respectively; Difference compares, obtains the modulating wave instruction value signal after adjusting and the computing through the 3rd PI regulon (28) and the 4th PI regulon (29) respectively; The modulating wave command signal obtains the start pulse signal of converter cell (31) switching device behind phase-shifting carrier wave sinusoidal pulse width modulation unit (30), and exports it converter cell (31) of combining inverter (3) to.
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| CN109104128A (en) * | 2018-07-27 | 2018-12-28 | 西安许继电力电子技术有限公司 | A kind of control method and system of AC excitation system converter multiple module paralleling |
| CN113285594A (en) * | 2021-05-28 | 2021-08-20 | 太原航空仪表有限公司 | Airborne aviation 270V power supply |
| CN113315376A (en) * | 2021-06-21 | 2021-08-27 | 哈尔滨工业大学 | Variable-weight DCDC converter based on current ripple optimization |
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