CN110086361A - A kind of five single-phase phase-deficient operation control methods of phase current source type current transformer - Google Patents
A kind of five single-phase phase-deficient operation control methods of phase current source type current transformer Download PDFInfo
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- CN110086361A CN110086361A CN201910387982.7A CN201910387982A CN110086361A CN 110086361 A CN110086361 A CN 110086361A CN 201910387982 A CN201910387982 A CN 201910387982A CN 110086361 A CN110086361 A CN 110086361A
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The present invention discloses a kind of five single-phase phase-deficient operation control methods of phase current source type current transformer, comprising the following steps: step S1: to the phase voltage set of vectors of remaining four phase of non-faultingOrder components decomposition is carried out, the phase voltage order components set of vectors of four phase of non-faulting is obtainedPI controller exports the constant active power reference value P for being defined as current transformerref；Step S2: the line current reference value set of vectors of four phase of current transformer non-faulting is calculatedStep S3: according to the phase voltage order components set of vectors of four phase of non-faultingAnd filter capacity capacitance CfFilter capacitor compensation current phasor set is calculatedStep S4: by what is obtainedWithAddition obtains current transformer modulation current reference value set of vectorsIt modulates to obtain the duty cycle signals of the corresponding switching tube of non-faulting by SPWM；Step S5: obtaining the duty cycle signals of switching tube, thus controls opening and turning off for converter switches pipe.
Description
Technical field
The present invention relates to the control method of five phase current source type current transformers in five phase isolated power networks, in particular to a kind of five phases
The single-phase phase-deficient operation control method of current source type converter.
Background technique
In fields such as the traction of new type power locomotive, mine hoisting and naval vessel propulsions, current transformer transmission power requirements are driven
Continuous increase, a kind of solution with preferable application prospect is to transmit function using five phase current source type current transformers at present
Rate.
Compared to traditional three-phase current source system, five phase current source systems are as a kind of great in low-pressure high-power occasion
The solution of development prospect has following significant advantage:
(1) switching device of equal-wattage grade is used, five phase current source systems can be realized the high-power transformation of low pressure,
The voltage stress that every phase switching device is born is remarkably decreased.
When (2) five phase current source type current transformers are applied to five-phase induction motor driving, torque output density is high, and ripple frequency increases
Add, pulsation amplitude reduces, and can be improved motor operation efficiency.
(3) has better fault-tolerant ability, operational reliability is high.Because there are number of phases redundancy, institutes for five phase current source systems
With when five phase transformation stream current source type converters, one phase or the failure of a few phases, reasonable control means, which still can be used, makes current transformer
Power deratng continuous service is without shutting down.In addition, in the case where short trouble occurs, since the current limliting of DC side inductance is made
For a period of time with still sustainable operation.
(4) control freedom degree is more, and flexibility is high.Five phase current source type current transformer controllable degrees of freedom and its independent number of phases phase
Deng more control performances may be implemented so it possesses higher control flexibility.
Wherein, advantage most outstanding is exactly operational reliability height to five phase current source type current transformers in practical applications, can be with
Realize the reliability service in the case of short circuit, phase shortage.In a short-circuit situation, due to the presence of DC side inductance, short-circuit electricity is limited
Stream quicklys increase, and current source type converter still works in normal constant current mode in the short time, and it is excessive to change to avoid electric current
Flow the harm of device.In the case where phase-deficient operation asks condition, since asymmetric situation of powering occurs in current transformer, traditional control mode will
DC bus current secondary ripple wave is caused to increase, exchange side line current peak increases, and wave distortion is serious etc..And do not have also at present
There is the correlation technique proposed about five phase current source type current transformer phase-deficient operations.
Summary of the invention
The purpose of the invention is to fill up the blank of the prior art, five phase current sources in five phase isolated power networks of one kind are provided
The control method of the single-phase phase-deficient operation of type current transformer.This method can guarantee five phase current source type current transformers in transmission firm power
In the case of, it realizes and guarantees that exchange side line current amplitude is minimum while instantaneous active power fluctuation is zero.Significantly improve five phases
Current source type converter operational reliability has system when single-phase open-phase fault situation occurs, it is not necessary to shut down, remain to continue
The ability of operation.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of five single-phase phase-deficient operation control methods of phase current source type current transformer, it is grid-connected based on five phase current source type current transformers
Rectifier, five phase current source type current transformers are connected to after points of common connection PCC by filter and exchange function with five phase isolated power networks
Rate；Wherein, current transformer forms five phase full-bridge topologies, the common direct current of DC side series connection of current transformer by ten power switching modules
Side bus inductance LdcFor inhibiting the current fluctuation of DC side；The control method the following steps are included:
Step S1: when each switch periods start, current transformer acquires the phase of four phase of remaining non-faulting using sample circuit
Voltage vector setAnd DC bus current idc, and willAnd idcIt is sent to the control module of current transformer,Carry out sequence point
Amount is decomposed, and the phase voltage order components set of vectors of four phase of non-faulting is obtainedBy idcIt handles to obtain through digital low-pass filtering
idc_LPF, by preset DC bus current reference value idc_refWith idc_LPFInput of the difference as PI controller, PI controller
Output is defined as the constant active power reference value P of current transformerref；
Step S2: using the phase voltage order components set of vectors of obtained four phase of non-faulting of step S1With it is constant
Active power reference value PrefThe line current reference value set of vectors of four phase of current transformer non-faulting is calculated
Step S3: according to the phase voltage order components set of vectors of four phase of non-faultingAnd filter capacity capacitance Cf
Filter capacitor compensation current phasor set is calculated
Step S4: by what is obtainedWithAddition obtains current transformer modulation current reference value set of vectorsPass through
SPWM modulates to obtain the duty cycle signals of the corresponding switching tube of non-faulting；
Step S5: obtaining the duty cycle signals of switching tube, thus controls opening and turning off for converter switches pipe.
Further, order components decomposition is carried out comprising the phase voltage to four phase of non-faulting in step S1.Pass through circuit analysis
Faulty circuit is equivalent to four phase unsymmetric circuits, then obtains four phase voltages, each sequence of electric current point using symmetrical component method
Amount.
It further, include the computational algorithm of line current reference value set of vectors in step S2.Pass through DC bus current
Adjuster obtains the reference value of system instantaneous active power, and line current then is calculated using each order components of four phase voltages
The set of reference vector.
Further, the modulator approach comprising asymmetric four phase currents in step S4.Utilize bipolarity carrier wave and four phases electricity
Stream respectively obtains the corresponding turn-on time of every phase switching tube with reference to comparing.
Compared with prior art, the beneficial effects brought by the technical solution of the present invention are as follows:
1. using symmetrical component method in the present invention, the alternating voltage in the case of the five single-phase phase shortages of phase current source system is carried out
It decomposes, obtains five phase currents in the case where meeting the fluctuation of system instantaneous active power and being zero and the smallest situation of alternating current amplitude
The modulation current reference of source type current transformer is simultaneously modulated.This makes five phase current source type current transformers have single-phase phase shortage situation
Under continuous service ability, reduce the electrical impact that runs and noise under current transformer fault condition, can extend to greatest extent
The service life of current transformer.
2. the fluctuation that this method inhibits current transformer DC bus current；In the case where transimission power is constant, minimize
The amplitude of AC side of converter line current reduces due to electric current out-of-limit a possibility that causing protection act, maximizes malfunction
Under power transmission.The power quality for improving exchange side line electric current simultaneously reduces additional power quality controlling device and throws
Money uses.
Detailed description of the invention
Fig. 1-1 is the five phase current source type converter topologies that single-phase phase shortage occurs in the specific embodiment of the invention.
Fig. 1-2 is the five phase current source type current transformer control programs that single-phase phase shortage occurs in the specific embodiment of the invention.
Fig. 2 is that the time arrow of five phase current source type current transformer voltage sequence components of e phase phase shortage in the present invention is distributed signal
Figure.
Fig. 3 is the distribution schematic diagram of the active and reactive component of voltage and current vector order components in the present invention.
Fig. 4-1 is five phase current source type current transformer AC and DC side current waveforms of e phase phase shortage when traditional scheme is applied
Schematic diagram.
Five phase current source type current transformer AC and DC side current waveforms of e phase phase shortage show when Fig. 4-2 is present invention application
It is intended to.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
Control method of the invention is based on the five single-phase phase shortages of the grid-connected rectifier of phase current source type current transformer as Figure 1-1
In the case of topological structure, and the control method in the case that single-phase phase shortage occurs in any one phase is all the same and as shown in Figs. 1-2.
Therefore, control program of the invention is explained in detail so that five phase current source type current transformer e give birth to single-phase open-phase fault on the contrary as an example
It states.As Figure 1-1, main circuit structure is specific as follows: after the single-phase open-phase fault of e phase occurs for five phase current source type current transformers,
It is a four phase current source type converter systems that whole system, which is degenerated, and four phase current source type current transformers pass through CL filter and four phases
Asymmetric isolated power network exchanges power；Wherein, RsFor power grid equivalent internal resistance, four phase current source type current transformers are by eight power switch
Module forms four phase full-bridge topologies, the common direct current side bus inductance L of DC side series connection of four phase current source type current transformersdcFor
Inhibit the current fluctuation of DC side.
The present invention is a kind of five single-phase phase-deficient operation control methods of phase current source type current transformer, and the specific method is as follows:
Step S1: when each switch periods start, current transformer acquires the phase of four phase of remaining non-faulting using sample circuit
Voltage vector setAnd DC bus current idc, and willAnd idcIt is sent to the control module of current transformer,Carry out sequence point
Amount is decomposed, and the phase voltage order components set of vectors of four phase of non-faulting is obtainedWill, by idcIt is handled through digital low-pass filtering
To idc_LPF, by preset DC bus current reference value idc_refWith idc_LPFInput of the difference as PI controller, PI control
Device exports the constant active power reference value P for being defined as current transformerref；
Step S2: using the phase voltage order components set of vectors for four phase of non-faulting that previous step obtainsAnd perseverance
Determine active power reference value PrefThe line current reference value set of vectors of four phase of current transformer non-faulting is calculated
Step S3: according to the phase voltage order components set of vectors of four phase of non-faultingAnd filter capacity capacitance Cf
Filter capacitor compensation current phasor set is calculated
Step S4: it will obtainSumAddition obtains current transformer modulation current reference value set of vectorsPass through
SPWM modulates to obtain the duty cycle signals of the corresponding switching tube of non-faulting；
Step S5: obtaining the duty cycle signals of switching tube, thus controls opening and turning off for converter switches pipe.
The following are the more specific embodiments of the present invention:
In step S1: for four phase system of asymmetry shown in Fig. 1-1, supply voltage can be indicated are as follows:
Voltage vector in formulaWherein, vga, vgb, vgc, vgdRespectively represent each phase voltage
Instantaneous value, amplitude size are E.Wherein "+, " "-, "
" 00, " and " 0, " respectively represents positive sequence, negative phase-sequence, half zero sequence and residual voltage vector.Likewise, exchange side line electric current may also indicate that
Are as follows:
Current phasor in formulaWherein, iLa, iLb, iLc, iLdRespectively represent each phase line current
Instantaneous value.The current phasor of each order components
Here by taking a phase as an example, the calculation method of each order components is illustrated using multiphase Fortescue transformation:
By the instantaneous value of the available asymmetric system a phase phase voltage order components of formula (3):
The instantaneous value of similarly available b, c and d phase phase voltage order components.By four phase voltage order components with time arrow shape
Formula is expressed as Fig. 2.
In step S2: being based on step S1, can learn that the instantaneous active of current transformer and reactive power can indicate are as follows:
In formula, pinsAnd qinsRespectively refer to the instantaneous active and reactive power of current source type converter.Operator " " indicates
The dot product of vector, footmark " ⊥ " represent the virtual vector calculated for reactive power,WithMutually orthogonal and amplitude is equal.
As shown in figure 3,It lags behind It lags behind It lags behind
It the characteristics of according to four phase system order components, can be by formula (5) abbreviation are as follows:
P in formula+, P-And P00Respectively represent the positive sequence, negative phase-sequence and half zero-sequence component of constant active power；Q+, Q-And Q00Respectively
Represent the positive sequence, negative phase-sequence and half zero-sequence component of constant reactive power；p2ωAnd q2ωRespectively represent the two of active power and reactive power
Harmonic.
Because zero-sequence current component is not present in failure system, current transformer is defined here and transmits constant active power
(Pdc) and reactive power (Qdc) are as follows:
For two frequency multiplication active power fluctuations (the i.e. p in formula (6) for eliminating system2ω=0) it, needs to meet:
Further abbreviation obtains the relational expression of line current space vector are as follows:
In formulaWithRespectively indicate the active and reactive component of line current vector positive-sequence component；WithPoint
Not Biao Shi line current vector negative sequence component active and reactive component；WithRespectively indicate half zero sequence of line current vector point
The active and reactive component of amount.Operator " | | | | " table
Show the mould of vector.
It can thus be concluded that the modulus value relational expression of each order components of line current space vector are as follows:
Using between formula (9) obtained line current time arrow and system voltage vector relationship and formula (10) obtain
Each order components time arrow modulus value expression formula of line current, the amplitude expression of available asymmetry four-phase line electric current:
In formulaWithThe amplitude for respectively indicating four-phase line electric current can be considered three variable (P00,
QdcAnd Q00) function:
MiL=f (P00,Qdc,Q00) (12)
In formula
It is calculated by control variate method, on the basis of the fluctuation of system instantaneous active power is zero, four-phase line electric current
When the maximum value of amplitude is minimum, the space vector set of the line current reference value order components of four phase of current transformer non-faulting can be indicated
Are as follows:
In step S3: ignoring the voltage drop on filter inductance, capacitance current are as follows:
In formulaWithThe positive sequence of capacitance current, negative phase-sequence and half zero-sequence component respectively on filter.CfFor filtering
The capacitance of device single-phase capacitance, j indicate that capacitance current phase is ahead of capacitor both end voltage phase pi/2, and ω indicates capacitance current
The angular frequency of fundametal compoment.
In step S4: output current of converter reference vector are as follows:
In formulaWithThe respectively positive sequence of output current of converter reference vector, negative phase-sequence, half
Zero sequence and zero-sequence component.
According to Fig. 4-1 it can be seen that when five phase current source type current transformers use traditional approach, DC bus current
Average value is 11A, but the secondary ripple wave containing 10A or so.In addition, exchange side line current waveform distortion is also very serious, residue four
Phase current magnitudes etc., peak-to-peak value reach 17A.According to Fig. 4-2 it can be seen that when failure system is using the mentioned controlling party of the present invention
When case, DC bus current average value is still controlled as 11A or so, but DC ripple electric current is suppressed to 1.5A.Remaining four phases
Line current Waveform sine is higher, and amplitude is equal, and line current peak-to-peak value is reduced to 12A.
To sum up: the application that the five phase current proposed by the present invention source single-phase phase-deficient operation control method of type current transformer can be convenient
In Yu Wuxiang PWM current source type converter, when single-phase open-phase fault occurs, play good DC current ripple with
And alternating current peak value inhibitory effect, it is a kind of novel converter control method being worthy to be popularized.
The present invention is not limited to embodiments described above.Above the description of specific embodiment is intended to describe and say
Bright technical solution of the present invention, the above mentioned embodiment is only schematical, is not restrictive.This is not being departed from
In the case of invention objective and scope of the claimed protection, those skilled in the art may be used also under the inspiration of the present invention
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (4)
1. a kind of five single-phase phase-deficient operation control methods of phase current source type current transformer, grid-connected whole based on five phase current source type current transformers
Device is flowed, five phase current source type current transformers are connected to after points of common connection PCC by filter and exchange power with five phase isolated power networks；
Wherein, current transformer forms five phase full-bridge topologies, the common DC side of DC side series connection of current transformer by ten power switching modules
Bus inductance LdcFor inhibiting the current fluctuation of DC side；It is characterized in that, the control method the following steps are included:
Step S1: when each switch periods start, current transformer acquires the phase voltage of four phase of remaining non-faulting using sample circuit
Set of vectorsAnd DC bus current idc, and willAnd idcIt is sent to the control module of current transformer,Carry out order components point
Solution, obtains the phase voltage order components set of vectors of four phase of non-faultingBy idcIt handles to obtain through digital low-pass filtering
idc_LPF, by preset DC bus current reference value idc_refWith idc_LPFInput of the difference as PI controller, PI controller
Output is defined as the constant active power reference value P of current transformerref；
Step S2: using the phase voltage order components set of vectors of obtained four phase of non-faulting of step S1With constant wattful power
Rate reference value PrefThe line current reference value set of vectors of four phase of current transformer non-faulting is calculated
Step S3: according to the phase voltage order components set of vectors of four phase of non-faultingAnd filter capacity capacitance CfIt calculates
Obtain filter capacitor compensation current phasor set
Step S4: by what is obtainedWithAddition obtains current transformer modulation current reference value set of vectorsPass through SPWM tune
The duty cycle signals of the corresponding switching tube of non-faulting are made；
Step S5: obtaining the duty cycle signals of switching tube, thus controls opening and turning off for converter switches pipe.
2. a kind of five single-phase phase-deficient operation control methods of phase current source type current transformer according to claim 1, which is characterized in that
Order components decomposition is carried out comprising the phase voltage to four phase of non-faulting in step S1；Specifically by analysis circuit by faulty circuit etc.
Effect is four phase unsymmetric circuits, obtains each order components of four phase voltages, electric current using symmetrical component method later.
3. a kind of five single-phase phase-deficient operation control methods of phase current source type current transformer according to claim 1, which is characterized in that
Include the computational algorithm of line current reference value set of vectors in step S2, obtains system especially by DC bus current adjuster
The set of line current reference vector is calculated in the reference value of instantaneous active power using each order components of four phase voltages later.
4. a kind of five single-phase phase-deficient operation control methods of phase current source type current transformer according to claim 1, which is characterized in that
Modulator approach comprising asymmetric four phase currents in step S4, specially does ratio using bipolarity carrier wave and four phase-current references
Compared with respectively obtaining the corresponding turn-on time of every phase switching tube.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492527A (en) * | 2019-08-30 | 2019-11-22 | 天津大学 | A kind of layering Poewr control method under cascaded H-bridges isolated operation |
| CN114337394A (en) * | 2022-01-04 | 2022-04-12 | 天津大学 | Five-phase permanent magnet synchronous motor coil turn-to-turn short circuit fault tolerance control method |
| CN115242071A (en) * | 2022-08-16 | 2022-10-25 | 南京航空航天大学 | Control method of Vienna rectifier under power grid phase failure |
-
2019
- 2019-05-10 CN CN201910387982.7A patent/CN110086361A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492527A (en) * | 2019-08-30 | 2019-11-22 | 天津大学 | A kind of layering Poewr control method under cascaded H-bridges isolated operation |
| CN110492527B (en) * | 2019-08-30 | 2023-03-14 | 天津大学 | Hierarchical power control method under isolated island operation of cascaded H bridge |
| CN114337394A (en) * | 2022-01-04 | 2022-04-12 | 天津大学 | Five-phase permanent magnet synchronous motor coil turn-to-turn short circuit fault tolerance control method |
| CN114337394B (en) * | 2022-01-04 | 2024-05-03 | 天津大学 | Five-phase permanent magnet synchronous motor coil turn-to-turn short circuit fault tolerance control method |
| CN115242071A (en) * | 2022-08-16 | 2022-10-25 | 南京航空航天大学 | Control method of Vienna rectifier under power grid phase failure |
| CN115242071B (en) * | 2022-08-16 | 2024-05-14 | 南京航空航天大学 | Control method of Vienna rectifier under power grid open-phase condition |
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