CN106208735A - The matrix converter of a kind of third-harmonic zero-sequence voltage and control method - Google Patents
The matrix converter of a kind of third-harmonic zero-sequence voltage and control method Download PDFInfo
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- CN106208735A CN106208735A CN201610717072.7A CN201610717072A CN106208735A CN 106208735 A CN106208735 A CN 106208735A CN 201610717072 A CN201610717072 A CN 201610717072A CN 106208735 A CN106208735 A CN 106208735A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The present invention relates to matrix converter and the control method of a kind of third-harmonic zero-sequence voltage.Described matrix converter includes: front stage circuits, intergrade circuit, late-class circuit and control module；Front stage circuits is connected with three-phase input power, obtains six kinds of pulses ripple unidirectional current for the alternating current of input is carried out rectification；Intergrade circuit is connected with front stage circuits, for carrying out producing third-harmonic zero-sequence voltage to front stage circuits according to six kinds of pulses ripple unidirectional current；Late-class circuit is connected with front stage circuits and intergrade circuit, obtains pre-conditioned alternating current for six kinds of pulses ripple unidirectional current is carried out inversion；Control module is connected with front stage circuits, intergrade circuit, late-class circuit, for obtaining the running parameter of three and generating corresponding control instruction to control output voltage and the output electric current of three.The present invention, without using the storage capacitor of dc bus, can reduce the volume of matrix converter, it is also possible to reduces the i.e. conversion efficiency of circuit power consumption high.
Description
Technical field
The present invention relates to power converter technical field, be specifically related to matrix converter and the control of a kind of third-harmonic zero-sequence voltage
Method.
Background technology
Fast development along with Power Electronic Technique so that it is obtain extensively should energy-saving and cost-reducing in terms of new energy development
With.Wherein, power inverter, extensively in various friendships-friendship transformation of electrical energy occasion such as, exchanges as the core of Power Electronic Technique
The fields such as frequency conversion drive, generation of electricity by new energy heart uninterrupted power source.
The rear class inverse cascade structure of A-A transducer is the most identical, and difference is only that Front End Converter.Existing front end converts
Device has passive Front End Converter, Active Front End Converter and mixed active Front End Converter.
It is excellent that passive front end changer has conversion efficiency height, EMI interference little, low cost, simple in construction and reliability height etc.
Point, is widely adopted in the field such as frequency control and renewable energy power generation.But, passive front end changer there is also energy list
To flowing, the ropy feature of input current.
The back-to-back pwm converter of Active Front End Converter, such as voltage-type and current mode, although possess intersection of ideals-friendship merit
Most of feature of rate changer, but the energy-storage travelling wave tube of heaviness result in it has relatively low power density and reliability.And it is another
A kind of Active Front End Converter i.e. indirect matrix converter without intermediate energy storage equipment, correlational study achieved with significance achievement,
But still suffer from: the synchronization on rectification stage and inverse cascade modulation causes the nonlinear problems such as burst pulse, limited input side is idle
Power control range, there are higher switching loss and EMI noise etc..
Mixing Front End Converter has the advantage of low switching losses and low cost, simultaneously because the control of active switch,
Input current quality and power factor have had and have been obviously improved, thus are the solutions of a kind of compromise.Mixing Front End Converter tool
Have: line commutation (diode) and force commutation (active switch)；Input characteristics is improved by the switching of active switch；Passive device
Part such as diode etc. bears main electrical current stress and power transmission tasks, and active switch voltammetric capacity is less；The most controlled
Cause some aspect of performance limited, such as input current sine degree, input power factor and power flow direction etc..
Summary of the invention
For defect of the prior art, the present invention provides matrix converter and the controlling party of a kind of third-harmonic zero-sequence voltage
Method, to solve in prior art the problem that matrix converter volume is big, cost is high, with improve the conversion efficiency of matrix converter with
And realize energy in bidirectional flow.
First aspect, the invention provides the matrix converter of a kind of third-harmonic zero-sequence voltage, and described matrix converter includes:
Front stage circuits, intergrade circuit, late-class circuit and control module；
Described front stage circuits is connected with three-phase input power, and for the alternating current of input carries out rectification, to obtain six kinds of pulses ripple straight
Stream electricity；
Described intergrade circuit is connected with described front stage circuits, for carrying out producing three times according to described six kinds of pulses ripple unidirectional current
Harmonic injection is to front stage circuits；
Described late-class circuit is connected with described front stage circuits and described intergrade circuit, for described six kinds of pulses ripple unidirectional current
Carry out inversion and obtain pre-conditioned alternating current；
Described control module is connected, for acquisition three with described front stage circuits, described intergrade circuit, described late-class circuit
The running parameter of person also generates corresponding control instruction to control output voltage and the output electric current of three.
Alternatively, described front stage circuits includes filter circuit and rectified three-phase circuit；Wherein,
Described filter circuit includes filter capacitor CFa, filter capacitor CFb, filter capacitor CFcWith filter inductance LFa, filtered electrical
Sense LFb, filter inductance LFc；Described filter inductance LFa, filter inductance LFb, filter inductance LFcIt is connected on three-phase input power respectively
On；Described filter capacitor CFa, described filter capacitor CFbWith described filter capacitor CFcThe first end be sequentially connected with filter capacitor CFa、
CFb、CFcOutfan in node Pa、Pb、Pc, the second end is connected；
Described rectified three-phase circuit includes 3 switching tube Sa+、Sb+、Sc+The upper brachium pontis constituted and 3 switching tube Sa-、Sb-、
Sc-The lower brachium pontis constituted；Wherein, described switching tube Sa+、Sb+、Sc+The first pole be connected with dc bus positive pole, the second pole depends on
Secondary with described switching tube Sa-、Sb-、Sc-The first pole be connected to described node Pa、Pb、Pc；Described switching tube Sa-、Sb-、Sc-'s
Second pole is connected with dc bus negative pole.
Alternatively, described intergrade circuit includes double Buck half-bridge circuit and two-way switch Sa、Sb、Sc；
Described pair of Buck half-bridge circuit includes switching tube Sy+、Sy-With inductance Ly；Described switching tube Sy+The first pole connect straight
Stream bus positive pole, the second pole connecting valve pipe Sy-The first pole in node P1；First end of described inductance Ly connects node P1, the
Two ends connect node P2；
Two-way switch SaIncluding switching tube SayAnd Sya, two-way switch SbIncluding switching tube SbyAnd Syb, two-way switch ScIncluding
Switching tube ScyAnd Syc；Described switching tube Sya、SybAnd SycFirst pole connect node P2, the second pole is sequentially connected with switching tube Say、
SbyAnd ScyThe first pole；Described switching tube Say、SbyAnd ScyThe second pole be consecutively connected to node Pa、Pb、Pc。
Alternatively, described late-class circuit includes three-phase voltage-type inverter；Described three-phase voltage-type inverter includes switch
Pipe Sr+、Ss+、St+The upper brachium pontis constituted and switching tube Sr-、Ss-、St-The lower brachium pontis constituted；
Described switching tube Sr+、Ss+、St+First pole connect dc bus positive pole, the second pole is sequentially connected with described switching tube
Sr-、Ss-、St-The first pole；Described switching tube Sr-、Ss-、St-Second pole connect described dc bus negative pole.
Alternatively, described late-class circuit also includes clamp circuit；Described clamp circuit includes fast recovery diode DcAnd electricity
Container Cc, described fast recovery diode DcPositive pole be connected with dc bus positive pole, negative pole and described capacitor CcThe first pole phase
Even；Described capacitor CcThe second pole be connected with dc bus negative pole.
Second aspect, present invention also offers the control method of the matrix converter of a kind of third-harmonic zero-sequence voltage, described control
Method processed includes the control method of front stage circuits and the control method of late-class circuit.
Alternatively, the control method of described front stage circuits includes:
Obtain the voltage u of filter capacitor in described front stage circuitsaF、ubF、ucF, DC bus-bar voltage UpnWith inductance LyThree
Subharmonic injection current iy；
Calculate described voltage uaF、ubF、ucFPhase-locked angle, determine sector, place according to described phase-locked angle, thus control three-phase
Rectification circuit and three two-way switch Sa、Sb、ScIn the conducting of each switching tube and shutoff；
Obtain third-harmonic zero-sequence voltage current reference value iy*；
According to described current reference value iy* with described third-harmonic zero-sequence voltage electric current iyBetween difference DELTA iyGenerate switch order,
To regulate switching tube Sy+Dutycycle.
Alternatively, the control method of described front stage circuits includes:
Obtain each phase actual output current ir, is, it in three-phase voltage-type inverter；
Obtain each phase voltage reference value and current reference value in described three-phase voltage-type inverter；
Described current reference value and described actual output current ir, is, it are carried out respectively dq conversion and obtains reference value
id*、iq* with actual value id、iqOutput, and calculate difference DELTA id、Δiq；
To described difference DELTA id、ΔiqCarry out dq inverse transformation again after PI regulation and obtain the variable quantity of every circuitry phase electric current, with
Variable quantity according to every circuitry phase electric current generates and regulates described three-phase voltage-type inverter breaker in middle pipe Sr+、Ss+、St+Dutycycle
Switch order.
Alternatively, described calculating described voltage uaF、ubF、ucFPhase-locked angle, determine sector, place according to described phase-locked angle,
Thus control rectified three-phase circuit and three two-way switch Sa、Sb、ScIn each switching tube conducting with in the step turned off, logical
Cross following methods and determine that sector, place includes:
ua>ub>ucInterval be set as sector I；
ub>ua>ucInterval be set as sector II；
ub>uc>uaInterval be set as sector III；
uc>ub>uaInterval be set as sector IV；
uc>ua>ubInterval be set as sector V；
ua>uc>ubInterval be set as sector VI；
And the control method of each switching tube includes:
The switching tube S of any time upper brachium pontis in each sectora+、Sb+、Sc+Maximum that of middle corresponding input voltage instantaneous value
Individual switch, and the switching tube S of lower brachium pontisa-、Sb-、Sc-That switch of middle corresponding input voltage instantaneous value minimum is constantly on,
Remaining switching tube turns off always；
By minimum for instantaneous voltage absolute value corresponding two-way in three two-way switch of third-harmonic zero-sequence voltage circuit
Switch conduction, other two-way switch turn off, and inject triple harmonic current to this phase power supply.
Alternatively, when late-class circuit includes clamp circuit, described control method also includes:
After matrix converter quits work, described clamp circuit absorbs the energy being stored in load leakage inductance；Work as square
When battle array changer normally works, described clamp circuit does not works.
As shown from the above technical solution, the alternating current that three-phase input power inputs is entered by the present invention by arranging front stage circuits
Row rectification obtains six kinds of pulses ripple unidirectional current, then injects triple-frequency harmonics by intergrade circuit to front stage circuits, and front stage circuits is with work
Frequency controls switching tube action, and then the switching tube in intergrade circuit uses high frequency regulation, so that front stage circuits input sine
Three-phase current, simultaneously without using the storage capacitor of dc bus, can reduce the volume of matrix converter.It addition, in Jin Youing
Intercaste circuit controls the conducting of switching tube high frequency and turns off when injecting triple-frequency harmonics, can reduce circuit power consumption i.e. conversion efficiency
High.
Accompanying drawing explanation
By being more clearly understood from the features and advantages of the present invention with reference to accompanying drawing, accompanying drawing is schematic and should not manage
Solve as the present invention is carried out any restriction, in the accompanying drawings:
Fig. 1 is the structural representation of the matrix converter of the third-harmonic zero-sequence voltage of the present invention；
Fig. 2 is the oscillogram of rectified three-phase circuit in Fig. 1；
Fig. 3 is the switching tube switch schematic diagram of rectified three-phase circuit in Fig. 1；
Fig. 4 is the energy Flow schematic diagram of the rectified three-phase circuit shown in Fig. 1～Fig. 3；
Fig. 5 is three-phase voltage-type inverter modulation schematic diagram in Fig. 1；
The control module schematic diagram of the matrix converter of the third-harmonic zero-sequence voltage that Fig. 6 provides for the present invention；
Fig. 7 be third-harmonic zero-sequence voltage of the present invention matrix converter in experimental data schematic diagram；
Fig. 8 (a) and (b) are the intergrade circuit i.e. waveform diagram of third-harmonic zero-sequence voltage circuit；
Fig. 9 (a) and (b) are the waveform diagram of matrixing under different modulating coefficient and different frequency；
Figure 10 (a) and (b) are the waveform diagram of matrix converter under different capacity factor；
Figure 11 (a) and (b) are the dynamic property waveform diagram of reference value Spline smoothing in matrix converter.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
Embodiments provide the matrix converter of a kind of third-harmonic zero-sequence voltage, as it is shown in figure 1, include: prime electricity
Road 101, intergrade circuit 102, late-class circuit 103 and control module (not shown).
Front stage circuits 101 is connected with three-phase input power, and for the alternating current of input carries out rectification, to obtain six kinds of pulses ripple straight
Stream electricity.Intergrade circuit 102 is connected with front stage circuits 101, for carrying out producing triple-frequency harmonics according to above-mentioned six kinds of pulses ripple unidirectional current
Being injected into front stage circuits 101, the injection of triple-frequency harmonics makes input current ensure sinusoidal symmetry.Late-class circuit 103 and prime
Circuit 101 and intergrade circuit 102 connect, and obtain pre-conditioned exchange for above-mentioned six kinds of pulses ripple unidirectional current is carried out inversion
Electricity.Control module is connected with front stage circuits 101, intergrade circuit 102, late-class circuit 103, for obtaining the running parameter of three
And generate corresponding control instruction to control output voltage and the output electric current of three.
In actual application, as it is shown in figure 1, this front stage circuits 101 includes filter circuit 1011 and two-way three phase rectifier electricity
Road 1012.Described filter circuit 1011 includes filter capacitor CFa, filter capacitor CFb, filter capacitor CFcWith filter inductance LFa, filtering
Inductance LFb, filter inductance LFc；Described filter inductance LFa, filter inductance LFb, filter inductance LFcIt is connected on three-phase input electricity respectively
On source；Described filter capacitor CFa, described filter capacitor CFbWith described filter capacitor CFcThe first end be sequentially connected with filter capacitor
CFa、CFb、CFcOutfan in node Pa、Pb、Pc, the second end is connected.Rectified three-phase circuit 1012 includes 3 switching tube Sa+、
Sb+、Sc+The upper brachium pontis constituted and 3 switching tube Sa-、Sb-、Sc-The lower brachium pontis constituted；Wherein, described switching tube Sa+、Sb+、Sc+'s
First pole is connected with dc bus positive pole, the second pole successively with described switching tube Sa-、Sb-、Sc-The first pole be connected to institute
State node Pa、Pb、Pc；Described switching tube Sa-、Sb-、Sc-The second pole be connected with dc bus negative pole.
It should be noted that rectified three-phase circuit uses power frequency period to carry out switch motion, so in the embodiment of the present invention
The power consumption of circuit can be reduced.
It addition, three-phase input power 100 is the constant three-phase electricity of amplitude, frequency, power-factor angle in the embodiment of the present invention
Source, the three phase mains such as provided by national grid.
As it is shown in figure 1, above-mentioned intergrade circuit 102 includes double Buck half-bridge circuit and two-way for third-harmonic zero-sequence voltage circuit
Switch Sa、Sb、Sc.Wherein, double Buck half-bridge circuits include switching tube Sy+、Sy-With inductance Ly.Switching tube Sy+First pole connect
Dc bus positive pole, the second pole connecting valve pipe Sy-The first pole in node P1；Inductance LyFirst end connect node P1, second
End connects node P2.Two-way switch SaIncluding switching tube SayAnd Sya, two-way switch SbIncluding switching tube SbyAnd Syb, two-way switch Sc
Including switching tube ScyAnd Syc；Switching tube Sya、SybAnd SycFirst pole connect node P2, the second pole is sequentially connected with switching tube Say、
SbyAnd ScyThe first pole；Described switching tube Say、SbyAnd ScyThe second pole be consecutively connected to node Pa、Pb、Pc。
As it is shown in figure 1, above-mentioned late-class circuit 103 includes three-phase voltage-type inverter 1032.This three-phase voltage-type inverter
Including switching tube Sr+、Ss+、St+The upper brachium pontis constituted and switching tube Sr-、Ss-、St-The lower brachium pontis constituted.Switching tube Sr+、Ss+、St+
First pole connect dc bus positive pole, the second pole is sequentially connected with switching tube Sr-、Ss-、St-The first pole；Switching tube Sr-、Ss-、
St-Second pole connect dc bus negative pole.
In actual application, after matrix converter quits work, the leakage inductance in load can store portion of energy, this portion
Dividing energy to be back to matrix converter and can damage the switching tube in this matrix converter, for solving the problems referred to above, the present invention implements
In example, late-class circuit 103 also includes clamp circuit 1031.As it is shown in figure 1, this clamp circuit 1031 includes fast recovery diode Dc
With capacitor Cc.Fast recovery diode DcPositive pole be connected with dc bus positive pole, negative pole and capacitor CcFirst the most connected；
Capacitor CcThe second pole be connected with dc bus negative pole.So, the energy stored in leakage inductance can be back to capacitor Cc
In, prevent from this matrix converter is caused damage.It should be noted that this capacitor CcWith jumbo storage of the prior art
Energy electric capacity is different, this capacitor CcCapacity be far smaller than the capacity of storage capacitor, and this capacitor Cc。
A charging process is had, as capacitor C when matrix converter is started workingcVoltage more than DC bus-bar voltage
Time, diode ends.The matrix converter energy that leakage inductance in load stores that quits work can make the cathode voltage of dc bus
Raise, diode current flow, so that capacitor CcAbsorption can electric current in leakage inductance, it is to avoid energy is back to matrix converter and damages
Hinder the switching tube in matrix converter.It addition, the small volume of above-mentioned electric capacity, the volume of matrix converter can be significantly reduced
Fig. 2 shows the oscillogram of the prime three-phase rectifier of matrix converter, including: (a) three-phase input supply voltage
ua, ub, ucAnd the six kinds of pulses ripple DC voltage u after two-way three-phase rectifierpn.(b) three-phase input power electric current ia, ib, ic。
(c) commutator a phase input current i after Three-phase electric-wave filterra.(d) third-harmonic zero-sequence voltage current reference value iy*.Can by Fig. 2
Know, under the operating mode of input unity power factor, only have changer input side by the current peak of third-harmonic zero-sequence voltage circuit
The half of current amplitude, thus the device of third-harmonic zero-sequence voltage circuit can select the device that current rating is less, thus can
To reduce the cost of matrix converter.
As it is shown on figure 3, according to the magnitude relationship of three-phase input supply voltage instantaneous value in time domain by a power cycle
Being divided into six sectors, concrete division methods is: ua>ub>ucInterval be set as sector I；ub>ua>ucInterval be set as
Sector II；ub>uc>uaInterval be set as sector III；uc>ub>uaInterval be set as sector IV；uc>ua>ubInterval setting
For sector V；ua>uc>ubInterval be set as sector VI.Any time upper brachium pontis 3 switch S in each sectora+、Sb+、Sc+In
That switch that corresponding input voltage instantaneous value is maximum, and lower brachium pontis 3 switch Sa-、Sb-、Sc-Middle corresponding input voltage is instantaneous
That switch of value minimum is constantly on, and remaining 4 switches turn off always.During energy forward flow, electric current flows through diode；
During energy back flowing, IGBT switching tube antiparallel with diode carrying electric current.
Three two-way switch of third-harmonic zero-sequence voltage circuit are then minimum by instantaneous voltage absolute value in three-phase input power
Decision mutually, will the minimum corresponding two-way switch conducting of instantaneous voltage absolute value, other two-way switch turn off, to this
Phase power supply injects triple harmonic current.
When the voltage of three-phase input power has following relation: ua>ub>uc,ub< when 0, if during energy forward flow, such as figure
Shown in 4 (a), in two-way rectified three-phase circuit, electric current flows through switching tube Sa+, Sc-Anti-paralleled diode, the triple-frequency harmonics of b phase
Injection current flows through switching tube SybAnd SbyAnti-paralleled diode.When energy back flows, as shown in Fig. 4 (b), two-way
In rectified three-phase circuit, circuit flows through switching tube Sa+, Sc-, b phase third-harmonic zero-sequence voltage electric current flows through switching tube SybInverse parallel two
Pole pipe and switching tube Sby。
In the embodiment of the present invention, three-phase voltage-type inverter uses carrier modulation strategy, as shown in Figure 5, it is assumed that three-phase is expected
Output voltage is:
Wherein UomIt is the amplitude of desired output voltage, ωoBeing the angular frequency of desired output voltage, φ is desired output voltage
Power-factor angle.
First modulated signal u is tried to achieveio* it isResidual voltage unoIt is defined as uno=-[max (ur,
us,ut)+min(ur,us,ut)]/2, so far can be in the hope of normalized modulated signalDutycycle d with each brachium pontisiForI.e.diCorresponding Sr+、Ss+、St+Dutycycle.
Fig. 6 shows the control module schematic diagram of matrix converter.This control module to front stage circuits, intergrade circuit and
Late-class circuit is controlled.
The control method of three-phase rectifier in front stage circuits, comprises the following steps:
Step 1: gather the data in prime rectified three-phase circuit work process；These data include prime three-phase filter circuit
The voltage u at each phase filter capacitor two endsaF, ubF, ucF, third-harmonic zero-sequence voltage circuit flows through harmonic injection inductance LyThree times
Harmonic injection electric current iy, and intermediate dc busbar voltage upn。
Step 2: to the three-phase voltage u collectedaF, ubF, ucFCarry out phase-locked through phaselocked loop (PLL), obtain locking phase angle theta.Root
Determine sector, place (sector determines according to above-mentioned sector partitioning method) according to lock phase angle theta, thus control rectified three-phase circuit and three
The conducting of each switching tube and shutoff in individual two-way switch；
Step 3: obtain third-harmonic zero-sequence voltage current reference value.
First, the A phase filter capacitor voltage u collected is madeaF5 subharmonic voltage u are obtained by band filterh5；Its
Secondary, by uh5U is obtained by low pass filter after being multiplied with sin (5 θ) again5sin(φu5), and by U5sin(φu5) regulate as PI
The input of device.Pi regulator is output as reference input performance number P* of three phase mains；Finally, obtain according to below equation calculating
:
Wherein, IqmFor three-phase input power side reactive current component, Merit for three-phase input power
Rate factor angle, is determined by demand, UimFor the amplitude of three-phase input supply voltage, ωiAngular frequency for three-phase input power.
Step 4: third-harmonic zero-sequence voltage current reference value i obtained according to step 3y* the i obtained with samplingyBetween difference DELTA
iyTo IGBT switching tube Sy+Dutycycle carry out PI regulation, obtain IGBT switching tube S in double Buck circuity+Dynamic Duty Cycle.
The control method of rear class three-phase voltage-type inverter, comprises the following steps:
Step 1: gather the data in rear class three-phase voltage type inverter circuit work process, inverse including rear class three-phase voltage type
Each output electric current i mutually on power transformation roadr, is, it。
Step 2: obtain three-phase voltage type inverter circuit reference value.Calculate according to three-phase desired output voltage and load
The reference value of three-phase voltage type inverter circuit output electric current.Three-phase desired output voltage is；
Wherein UomIt is the amplitude of desired output voltage, ωoBeing the angular frequency of desired output voltage, φ is desired output voltage
Power-factor angle, load impedance is Z.
So three-phase current reference value is
Step 3: reference value i that the three-phase voltage type inverter circuit output electric current obtained according to step 1 converts through dqd*,
iq* the i through dq conversion is obtained with samplingd, iqBetween difference DELTA id, then Δ iqTo three-phase voltage type after dq inverse transformation
Switching tube S in inverter circuitr+、Ss+、St+Dutycycle carry out PI regulation, the switch in regulation three-phase voltage type inverter circuit
Pipe Sr+、Ss+、St+Dynamic Duty Cycle.
The control method of prime three-phase rectifier, including:
Superposition feedforward term k in the reference value of third-harmonic zero-sequence voltage current controller；Wherein,
umax=max (uaF, ubF, ucF), umid=mid (uaF, ubF, ucF), umin=min (uaF, ubF, ucF)。
For verifying matrix converter and the effectiveness of control method of the third-harmonic zero-sequence voltage of embodiment of the present invention offer, this
Invent and an embodiment arranges the experimental data of above-mentioned matrix converter as it is shown in fig. 7, comprises rated power, three-phase input power
The amplitude of voltage and frequency, the amplitude of three-phase inverting circuit output reference voltage, the switching frequency of IGBT switching tube, three-phase input
The inductance capacitance value of wave filter, the inductance value of third-harmonic zero-sequence voltage, three-phase voltage type inverter circuit output inductor value and negative
Carry resistance value.
Fig. 8 (a) and (b) show the waveform diagram of third-harmonic zero-sequence voltage circuit.As shown in Figure 8, input including: three-phase
Power supply a phase voltage ua, electric current ia, third-harmonic zero-sequence voltage electric current iy, three-phase voltage-type inverter r phase exports electric current.Fig. 8 (a) is three
Oscillogram when subharmonic injection circuit does not works, Fig. 8 (b) is the oscillogram during work of third-harmonic zero-sequence voltage circuit, by two groups
Figure contrast understands, during the work of third-harmonic zero-sequence voltage circuit, and the matrix converter input current of this third-harmonic zero-sequence voltage and output electricity
Stream harmonic distortion is the least, and waveform quality is high.
Fig. 9 shows the waveform diagram in matrix converter under different modulating coefficient and different frequency.As it is shown in figure 9,
Input side power-factor angle in experimental matrix changerIt is set to 0.In Fig. 9 (a) and Fig. 9 (b), the output parameter of changer is arranged
It is respectively mi=0.7, fo=40Hz and mi=1, fo=100Hz.It can be seen that in different output frequencies and modulation system
Under several, the input and output electric current of matrix converter is all perfect sinusoidal wave form, and input current and input voltage same phase.
Figure 10 shows the waveform diagram under different capacity factor.As shown in Figure 10, the output parameter of matrix converter
Arrange and be respectively mi=1, fo=40Hz.In Figure 10 (a), input power factor angle is set to π/6, i.e. input current delayed input electricity
Pressure π/6.In Figure 10 (b), input power factor angle is set to-π/6, i.e. input current advanced input voltage π/6.The width of output electric current
Value is about 5.6A, is indicated above in the case of different input power factor angle that the maximum voltage transfer ratio of matrix converter can
Reach 0.866.
Figure 11 shows the dynamic property waveform diagram of reference value Spline smoothing in matrix converter.In Figure 11 (a), defeated
Go out watt current reference value id_refInitial value be+6A, be-6A in moment of 0.15s by+6A Spline smoothing.In Figure 11 (b),
Output watt current reference value id_refInitial value be-6A, be+6A in moment of 0.15s by-6A Spline smoothing.Can from Figure 11
To find out, the matrix converter of third-harmonic zero-sequence voltage quick smoothly can switch under two kinds of operational modes of generating electronic, dynamic
State is functional.
In the present invention, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or
Hint relative importance.Term " multiple " refers to two or more, unless otherwise clear and definite restriction.
Although being described in conjunction with the accompanying embodiments of the present invention, but those skilled in the art can be without departing from this
Making various modifications and variations in the case of bright spirit and scope, such amendment and modification each fall within by claims
Within limited range.
Claims (10)
1. the matrix converter of a third-harmonic zero-sequence voltage, it is characterised in that described matrix converter includes: front stage circuits, in
Intercaste circuit, late-class circuit and control module；
Described front stage circuits is connected with three-phase input power, obtains six kinds of pulses ripple direct current for the alternating current of input is carried out rectification
Electricity；
Described intergrade circuit is connected with described front stage circuits, for carrying out producing triple-frequency harmonics according to described six kinds of pulses ripple unidirectional current
It is injected into front stage circuits；
Described late-class circuit is connected with described front stage circuits and described intergrade circuit, for carrying out described six kinds of pulses ripple unidirectional current
Inversion obtains pre-conditioned alternating current；
Described control module is connected with described front stage circuits, described intergrade circuit, described late-class circuit, for obtaining three's
Running parameter also generates corresponding control instruction to control output voltage and the output electric current of three.
Matrix converter the most according to claim 1, it is characterised in that described front stage circuits includes filter circuit and three-phase
Rectification circuit；Wherein,
Described filter circuit includes filter capacitor CFa, filter capacitor CFb, filter capacitor CFcWith filter inductance LFa, filter inductance LFb、
Filter inductance LFc；Described filter inductance LFa, filter inductance LFb, filter inductance LFcIt is connected on respectively on three-phase input power；Described
Filter capacitor CFa, described filter capacitor CFbWith described filter capacitor CFcThe first end be sequentially connected with filter capacitor CFa、CFb、CFc's
Outfan is in node Pa、Pb、Pc, the second end is connected；
Described rectified three-phase circuit includes 3 switching tube Sa+、Sb+、Sc+The upper brachium pontis constituted and 3 switching tube Sa-、Sb-、Sc-Structure
The lower brachium pontis become；Wherein, described switching tube Sa+、Sb+、Sc+The first pole be connected with dc bus positive pole, the second pole successively with
Described switching tube Sa-、Sb-、Sc-The first pole be connected to described node Pa、Pb、Pc；Described switching tube Sa-、Sb-、Sc-Second
Pole is connected with dc bus negative pole.
Matrix converter the most according to claim 1, it is characterised in that described intergrade circuit includes double Buck half-bridge electricity
Road and two-way switch Sa、Sb、Sc；
Described pair of Buck half-bridge circuit includes switching tube Sy+, Sy-and inductance Ly；First pole of described switching tube Sy+ connects direct current
Bus positive pole, first pole of the second pole connecting valve pipe Sy-is in node P1；First end of described inductance Ly connects node P1, second
End connects node P2；
Two-way switch SaIncluding switching tube SayAnd Sya, two-way switch SbIncluding switching tube SbyAnd Syb, two-way switch ScIncluding switch
Pipe ScyAnd Syc；Described switching tube Sya、SybAnd SycFirst pole connect node P2, the second pole is sequentially connected with switching tube Say、SbyWith
ScyThe first pole；Described switching tube Say、SbyAnd ScyThe second pole be consecutively connected to node Pa、Pb、Pc。
Matrix converter the most according to claim 1, it is characterised in that described late-class circuit includes three-phase voltage type inversion
Device；Described three-phase voltage-type inverter includes switching tube Sr+、Ss+、St+The upper brachium pontis constituted and switching tube Sr-、Ss-、St-Constitute
Lower brachium pontis；
Described switching tube Sr+、Ss+、St+First pole connect dc bus positive pole, the second pole is sequentially connected with described switching tube Sr-、
Ss-、St-The first pole；Described switching tube Sr-、Ss-、St-Second pole connect described dc bus negative pole.
Matrix converter the most according to claim 4, it is characterised in that described late-class circuit also includes clamp circuit；Institute
State clamp circuit and include fast recovery diode DcWith capacitor Cc, described fast recovery diode DcPositive pole and dc bus positive pole
It is connected, negative pole and described capacitor CcFirst the most connected；Described capacitor CcThe second pole be connected with dc bus negative pole.
6. the control method of the matrix converter of a third-harmonic zero-sequence voltage, it is characterised in that described control method includes prime
The control method of circuit and the control method of late-class circuit.
Control method the most according to claim 6, it is characterised in that the control method of described front stage circuits includes:
Obtain the voltage u of filter capacitor in described front stage circuitsaF、ubF、ucF, DC bus-bar voltage UpnWith inductance LyThree times humorous
Ripple injection current iy；
Calculate described voltage uaF、ubF、ucFPhase-locked angle, determine sector, place according to described phase-locked angle, thus control three phase rectifier
Circuit and three two-way switch Sa、Sb、ScIn the conducting of each switching tube and shutoff；
Obtain third-harmonic zero-sequence voltage current reference value iy*；
According to described current reference value iy* and described third-harmonic zero-sequence voltage electric current iyBetween difference DELTA iyGenerate switch order, to adjust
Joint switching tube Sy+Dutycycle.
8. according to the control method of claim 6 or 7, it is characterised in that the control method of described front stage circuits includes:
Obtain each phase actual output current ir, is, it in three-phase voltage-type inverter；
Obtain each phase voltage reference value and current reference value in described three-phase voltage-type inverter；
Described current reference value and described actual output current ir, is, it are carried out respectively dq conversion obtain reference value id*,
Iq* exports with actual value id, iq, and calculates difference DELTA id、Δiq；
To described difference DELTA id、ΔiqCarry out dq inverse transformation again after PI regulation and obtain the variable quantity of every circuitry phase electric current, with basis
The variable quantity of every circuitry phase electric current generates and regulates described three-phase voltage-type inverter breaker in middle pipe Sr+、Ss+、St+The switch of dutycycle
Instruction.
Control method the most according to claim 7, it is characterised in that described calculating described voltage uaF、ubF、ucFPhase-locked
Angle, determines sector, place according to described phase-locked angle, thus controls rectified three-phase circuit and three two-way switch Sa、Sb、ScIn each
The conducting of switching tube, with the step turned off, determines that sector, place includes by the following method:
ua>ub>ucInterval be set as sector I；
ub>ua>ucInterval be set as sector II；
ub>uc>uaInterval be set as sector III；
uc>ub>uaInterval be set as sector IV；
uc>ua>ubInterval be set as sector V；
ua>uc>ubInterval be set as sector VI；
And the control method of each switching tube includes:
The switching tube S of any time upper brachium pontis in each sectora+、Sb+、Sc+That of middle corresponding input voltage instantaneous value maximum is opened
Close, and the switching tube S of lower brachium pontisa-、Sb-、Sc-That switch of middle corresponding input voltage instantaneous value minimum is constantly on, remaining
Switching tube turn off always；
By the corresponding two-way switch of instantaneous voltage absolute value minimum in three two-way switch of third-harmonic zero-sequence voltage circuit
Conducting, other two-way switch turn off, and inject triple harmonic current to this phase power supply.
Control method the most according to claim 9, it is characterised in that when late-class circuit includes clamp circuit, described control
Method processed also includes:
After matrix converter quits work, described clamp circuit absorbs the energy being stored in load leakage inductance；When matrix becomes
When parallel operation normally works, described clamp circuit does not works.
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| CN110867864A (en) * | 2019-11-26 | 2020-03-06 | 东莞南方半导体科技有限公司 | Off-grid operation control method for active third harmonic injection matrix converter |
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| CN109873565B (en) * | 2019-03-11 | 2020-09-08 | 中国矿业大学 | Novel topology of two-stage matrix converter and common-mode voltage suppression strategy thereof |
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