CN110380633A - A kind of electric current modification method being directed under non-ideal power grid based on one circle control - Google Patents
A kind of electric current modification method being directed under non-ideal power grid based on one circle control Download PDFInfo
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- CN110380633A CN110380633A CN201910697772.8A CN201910697772A CN110380633A CN 110380633 A CN110380633 A CN 110380633A CN 201910697772 A CN201910697772 A CN 201910697772A CN 110380633 A CN110380633 A CN 110380633A
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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
- 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
- H02M7/219—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 bridge configuration
Abstract
The present invention provides a kind of based on one circle control for the electric current modification method under non-ideal power grid, this method is used for the three-phase inverter of one circle control, as three-phase full-bridge rectifier, MMC converter, three-phase VIENNA rectifier, three-phase connect without bridge rectifier and all stars the electric current modification method under unbalanced source voltage of cascade connection type three-phase inverter topology.Specifically includes the following steps: determining the relevant parameter of system first, non-equilibrium among three phase voltages are then calculated, compensation rate is finally introduced based on the above calculating parameter.The characteristics of present invention is according to monocycle Direct Current Control, by the way that fed-back current signals are compared and are calculated with penalty coefficient, to effectively be corrected to out-of-balance current of the three-phase inverter under unbalanced power grid under the premise of not increasing system complexity.The present invention realizes that simply high reliablity provides a kind of effective modification method for the out-of-balance current under unbalanced power grid during one circle control, widened the application range of one circle control.
Description
Technical field
The present invention relates to power electronics and power system automatic fields, in particular to based on the three-phase of one circle control
Electric current modification method of the converter under unbalanced power grid.
Background technique
Power grid appearance is frequently resulted in because of situations such as fault or the access of unbalanced load in field of power system
Unbalanced situation.And unbalanced power grid can production to us and and household electricity generate many adverse effects: 1. increase lines
The electric energy loss on road.2. increasing the electric energy loss of distribution transformer.3. distribution transforming power output is reduced.4. distribution transforming generates zero-sequence current.
One circle control (One-Cycle Control, OCC) is a kind of non-linear big signal PWM control theory, simultaneously
It is also a kind of simulation PWM control technology.The control technology is not influenced by load current harmonic wave, and do not need voltage sensor,
Phaselocked loop and filter can complete the tracking to electric current, have very strong robustness.With traditional instantaneous nothing based on transformation
Function Power Theory technology, Repetitive controller are compared with PR control, all have significant advantage in the complexity and cost of algorithm.
Therefore, this technology is widely used in the related neck such as PFC, active power filter i.e. static reactive generator
Domain, and more and more receive the concern of domestic and foreign scholars.
But traditional one circle control can only be run under three-phase equilibrium power grid, output electric current can be with the wave of voltage
It moves and fluctuates, to bring unfavorable image to power grid；In addition to this, converter as unbalanced electric current and cause
The collapse of system.Therefore, the electric current under traditional one circle control and do not have controllability at present, this indicates that traditional single-revolution
Phase control cannot achieve balance control for the electric current under three unbalanced power grids, this greatly constrains monocycle control
The application range and occasion of system.
So neither increasing the complexity of one circle control there is an urgent need to a kind of, and do not need additionally to increase voltage biography
It can be achieved with electronic power convertor current balance type under three-phase imbalance power grid in the case where sensor, phaselocked loop and filter
Control method, this for expand one circle control application range, the equipment for improving the related fieldss such as existing reactive compensation
Can, it increases economic efficiency and is of great significance.
Summary of the invention
Simple the purpose of the present invention is designing a kind of realization, high reliablity does not need filter, phaselocked loop and filter
In the case where can be achieved with the control method of electronic power convertor current balance type under three-phase imbalance power grid.
In order to achieve the above objectives, a kind of electricity being directed under non-ideal power grid based on one circle control provided by the invention
Modification method is flowed, control algolithm corresponding with this control method includes absolute value block, proportionality coefficient computing module, stagnant ring
Module, carrier wave generation module, signals revivification module, computing module and clipping module.The present invention refers specifically to:
When certain imbalance of three-phase voltage, by every phase current feedback signal | i'x| (A, B, C three-phase are represented in formula x
Electric current) multiplied by the penalty coefficient k of the phase currentx(A, B, C three-phase current are represented in formula x) constitutes electric current reconstructing and controls signal iRx
(A, B, C three-phase current are represented in formula x), electric current reconstructing controls signal i laterRxIt is generated again with outer voltage output steady-state value
Amplitude is UmCarrier wave compare, and then generate driving signal, the most out-of-balance current to three-phase inverter under unbalanced power grid
Effectively corrected.
Steps are as follows for a kind of electric current modification method being directed under non-ideal power grid based on one circle control:
(1) grid voltage amplitude detects: when unbalanced source voltage, A, B, C three-phase power grid voltage can carry out as follows
It indicates:
U can further be usedAUnified representation are as follows:
Three pole reactor electric current is i in three-phase inverterA、iB、iC, pass through AC sampling resistance RsTo three pole reactor electric current iA、
iB、iCIt is sampled, obtains three pole reactor current sampling signal RsiA、RsiB、RsiC；Three-phase inverter based on one circle control
Electric current itself can completely track the variation of network voltage therefore can be by the electric current to the converter in a work
The integral in frequency period obtains above-mentioned parameter electric current expression-form, it may be assumed that
(2) reference current is determined: for the ease of analyzing a kind of electricity being directed under non-ideal power grid based on one circle control
Flow modification method, first defined variable: detection electric current i'AIt can indicate are as follows:
The coefficient that scale operation module is calculated can be expressed as kx(A, B, C three-phase current are represented in formula x), stagnant ring
Module can retain the result of last operation i.e.: kx-1；The output of signals revivification module be and unbalance voltage equal proportion
Reduction current itx(A, B, C three-phase current are represented in formula x)；A kind of electricity being directed under non-ideal power grid based on one circle control
The electric current reconstructing control signal of stream modification method can indicate are as follows:
In three-phase imbalance power grid, the amplitude and phase of three-phase voltage can all generate fluctuation, thus in control system
In, then it needs to select medium voltage by operation as standard value, carries out electric current amendment, after control enters closed-loop control, ginseng
Examine electric current irefThe proportionality coefficient k that will be exported by stagnant ring moulds blockA-1, kB-1, kC-1With feedback current phase RsixIt is multiplied, ginseng control voltage
Selection standard is denoted as:
Original state is a kind of special state, at this time scale parameter kA-1=kB-1=kC-1=1, above formula can be rewritten are as follows:
(3) proportionality coefficient operation:, therefore, will be every in order to keep each phase current close after reference current has been determined
Electric current obtains proportionality coefficient compared with reference current:
K when into original stateA-1=kB-1=kC-1=1, therefore, the first time operation of above formula can be with abbreviation are as follows:
Due in one circle control:
Vm(1-dx)=| Rs·ix|
So available:
Thus, it can be seen that can effectively reflect the imbalance of power grid by the operation to electric current, and then pass through
Electric current is controlled, corresponding out-of-balance current inhibition can also be carried out.
(4) electric current restores: in order to determine the degree of unbalancedness of voltage by electric current to compensate, just having to pair
Electric current carries out control reduction, therefore is retained by the result of stagnant ring moulds block comparative example coefficient computing module operation, then exists
The proportionality coefficient and value and detection electric current i' that operation new each time calculates the last time before startingAIt is multiplied, to completely will
Out-of-balance current under unbalanced power grid is restored, therefore, reduction current itxThere can be following expression:
itx=kx-1i'x=kx-1Rsix
(5) obtain the practical control signal of electric current: it is available at this time it is a kind of based on one circle control for non-ideal electricity
The electric current reconstructing of electric current modification method off the net controls signal:
(6) by the three pole reactor current sampling signal i in step (5)RA、iRB、iRCIt takes into computing module, obtains clipping
Value signal；For the control signal not overshoot of Guarantee control system, guarantee system stability, make signal controllable range it
It is interior, known by step (5), required amplitude limit value size is calculated by computing module；
(7) in electronic power convertor DC voltage outer ring, electronic power convertor DC voltage reference value
With DC side feedback voltage UdPressure difference signal e is exported after subtracteru, euIt indicates are as follows:
Amplitude of output of the pressure difference signal after voltage regulator PI control as carrier signal, can by one circle control
Know UmThere is following expression:
Wherein Z is load impedance:
Z=Re+j(XL-XC)；
(8) the three-phase current reconfigurable control signal in step (7) after clipping, with the amplitude generated by carrier wave generation module
For UmCarrier signal, by comparator carry out signal complete a business transaction generate pwm signal be sent into bus, and then control power electronics become
Flow the on-off of switching device in device.
By step (2) to step (8) it is found that the invention enables the signals compared with primary carrier signal by detection electric current Rsix
Become electric current reconstructing control signal:
iRx=kx|i'x|；
X=A, B, C in formula, respectively represent three-phase current.
The present invention has the advantages that control structure is simple, not needing voltage sensor, phaselocked loop, filter be can be realized
The balance control of electric current is realized under any unbalanced power grid.This control strategy is intersect by power network current first comparing,
Then proportionality coefficient is multiplied with actually detected electric current, circuit is simple in practical projects, it is easy to accomplish.It remains traditional single
The characteristics of being not necessarily to voltage sensor, filter and multiplier of period control program, and without increasing additional senser element.
Implementation cost is low, and strong operability has a wide range of application.
It is described in detail below in conjunction with embodiment referring to attached drawing.
Detailed description of the invention
Fig. 1 is a kind of electric current modification method schematic diagram being directed under non-ideal power grid based on one circle control；
Fig. 2 is three-phase full-bridge rectifier topology；
Fig. 3 is MMC converter topology；
Fig. 4 is three-phase without bridge rectifier topology；
Fig. 5 is the topological structure of line voltage cascaded three-phase VIENNA rectifier；
Fig. 6 is the topological structure of the H bridge cascade star-like current transformer of three-phase；
Fig. 7 is the topological structure of no bridge cascade star-like current transformer of three-phase；
Fig. 8 is the topological structure of the single-phase VIENNA rectifier cascade star-like rectifier of three-phase；
Fig. 9 is the topology knot based on H bridge, the star-like rectifier of the Mixed cascading three-phase without bridge and single-phase VIENNA rectifier
Structure；
Figure 10 is three Switch Three-Phase VIENNA rectifier topology used in the implementation case；
Figure 11 is six Switch Three-Phase VIENNA rectifier topologys；
Figure 12 is to start a kind of electric current modification method being directed under non-ideal power grid based on one circle control at 0.15 second
Three-phase current simulation waveform, as seen from the figure: in 0-0.15s, three-phase current can be uneven because of imbalance of three-phase voltage
Weighing apparatus,；The electric current modification method being directed under non-ideal power grid in 0.15s using a kind of based on one circle control, three-phase current
It restores balance in 0.1s, adequately demonstrates a kind of correcting for the electric current under non-ideal power grid based on one circle control
The validity of method；
Figure 13 is to start a kind of electric current modification method being directed under non-ideal power grid based on one circle control at 0.15 second
Three-phase current amplitude simulation waveform；As seen from the figure: in 0-0.15s, the amplitude of three-phase current can be because of three-phase voltage not
Balance and it is uneven,；The electric current amendment side being directed under non-ideal power grid in 0.15s using a kind of based on one circle control
Method, three-phase current amplitude in 0.1s is of substantially equal, adequately demonstrate it is a kind of based on one circle control for non-ideal electricity
The validity of electric current modification method off the net；
Figure 14 is to start a kind of electric current modification method being directed under non-ideal power grid based on one circle control at 0.15 second
DC side output voltage simulation waveform；As seen from the figure: non-ideal power grid being directed to based on one circle control using a kind of
Under electric current modification method when, will not influence the stability of DC voltage；
Figure 15 is the electric current modification method being directed under non-ideal power grid under stable state using a kind of based on one circle control
DC voltage fluctuates simulation waveform；As seen from the figure: using it is a kind of based on one circle control under non-ideal power grid
Electric current modification method when, the fluctuation of DC voltage can be reduced to ± 2V；
Figure 16 is to fluctuate simulation waveform as seen from the figure using the DC voltage of traditional one circle control under stable state:
When using traditional one circle control, the fluctuation of DC voltage is reduced to ± 4V, to use a kind of needle based on one circle control
To twice of the electric current modification method under non-ideal power grid.
Specific embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments, and correction strategy is as follows:
Example principles figure as shown in Figure 1 can be seen that using three-phase VIENNA rectifier as case study on implementation, first by ratio
Coefficient computing module, stagnant ring moulds block, signals revivification module calculate the degree of unbalancedness of three-phase power grid voltage, then by detection electricity
Stream is multiplied with proportionality coefficient, obtains three-phase current reconfigurable control signal, finally determines limit of compensation by clipping module.
It is characterized by: when certain imbalance of three-phase voltage, by every phase current feedback signal | i'x| multiplied by the phase
The penalty coefficient k of electric currentxIt constitutes electric current reconstructing and controls signal iRx, electric current reconstructing controls signal i laterRxIt is defeated with outer voltage again
The amplitude that steady-state value generates out is UmCarrier wave compare, and then generate driving signal, most to three-phase inverter in unbalanced power grid
Under out-of-balance current effectively corrected.
Steps are as follows for a kind of electric current modification method being directed under non-ideal power grid based on one circle control:
(1) grid voltage amplitude detects: when unbalanced source voltage, A, B, C three-phase power grid voltage can carry out as follows
It indicates:
U can further be usedAUnified representation are as follows:
Three pole reactor electric current is i in three-phase inverterA、iB、iC, pass through AC sampling resistance RsTo three pole reactor electric current iA、
iB、iCIt is sampled, obtains three pole reactor current sampling signal RsiA、RsiB、RsiC；Three-phase inverter based on one circle control
Electric current itself can completely track the variation of network voltage therefore can be by the electric current to the converter in a work
The integral in frequency period obtains above-mentioned parameter electric current expression-form, it may be assumed that
(2) reference current is determined: for the ease of analyzing a kind of electricity being directed under non-ideal power grid based on one circle control
Flow modification method, first defined variable: detection electric current i'AIt can indicate are as follows:
The coefficient that scale operation module is calculated can be expressed as kx, stagnant ring moulds block can retain last operation
As a result i.e.: kx-1；The output of signals revivification module is the reduction current i with unbalance voltage equal proportiontx；One kind being based on the monocycle
The electric current reconstructing control signal for the electric current modification method under non-ideal power grid of control can indicate are as follows:
In three-phase imbalance power grid, the amplitude and phase of three-phase voltage can all generate fluctuation, thus in control system
In, then it needs to select medium voltage by operation as standard value, carries out electric current amendment, after control enters closed-loop control, ginseng
Examine electric current irefThe proportionality coefficient k that will be exported by stagnant ring moulds blockA-1, kB-1, kC-1With feedback current phase RsixIt is multiplied, ginseng control voltage
Selection standard is denoted as:
Original state is a kind of special state, at this time scale parameter kA-1=kB-1=kC-1=1, above formula can be rewritten are as follows:
(3) proportionality coefficient operation:, therefore, will be every in order to keep each phase current close after reference current has been determined
Electric current obtains proportionality coefficient compared with reference current:
K when into original stateA-1=kB-1=kC-1=1, therefore, the first time operation of above formula can be with abbreviation are as follows:
Due in one circle control:
Vm(1-dx)=| Rs·ix|
So available:
Thus, it can be seen that can effectively reflect the imbalance of power grid by the operation to electric current, and then pass through
Electric current is controlled, corresponding out-of-balance current inhibition can also be carried out.
(4) electric current restores: in order to determine the degree of unbalancedness of voltage by electric current to compensate, just having to pair
Electric current carries out control reduction, therefore is retained by the result of stagnant ring moulds block comparative example coefficient computing module operation, then exists
The proportionality coefficient and value and detection electric current i' that operation new each time calculates the last time before startingAIt is multiplied, to completely will
Out-of-balance current under unbalanced power grid is restored, therefore, reduction current itxThere can be following expression:
itx=kx-1i'x=kx-1Rsix
(5) obtain the practical control signal of electric current: it is available at this time it is a kind of based on one circle control for non-ideal electricity
The electric current reconstructing of electric current modification method off the net controls signal:
(6) by the three pole reactor current sampling signal i in step (5)RA、iRB、iRCIt takes into computing module, obtains clipping
Value signal；For the control signal not overshoot of Guarantee control system, guarantee system stability, make signal controllable range it
It is interior, known by step (5), required amplitude limit value size is calculated by computing module；
(7) in electronic power convertor DC voltage outer ring, electronic power convertor DC voltage reference value
With DC side feedback voltage UdPressure difference signal e is exported after subtracteru, euIt indicates are as follows:
Amplitude of output of the pressure difference signal after voltage regulator PI control as carrier signal, can by one circle control
Know UmThere is following expression:
Wherein Z is load impedance:
Z=Re+j(XL-XC)；
Wherein ReRepresent purely resistive load；jXLIt is represented as inductive load；jXLIt is represented as capacitive load.
(8) the three-phase current reconfigurable control signal in step (7) after clipping, with the amplitude generated by carrier wave generation module
For UmCarrier signal, by comparator carry out signal complete a business transaction generate pwm signal be sent into bus, and then control power electronics become
Flow the on-off of switching device in device.
By step (2) to step (8) it is found that this patent proposed it is a kind of based on one circle control for non-ideal
Electric current modification method under power grid, so that the signal compared with primary carrier signal is by detection electric current RsixBecome electric current reconstructing control
Signal i processedRx:
iRx=kx|i'x|；
X=A, B, C in formula, respectively represent three-phase current.
Claims (2)
1. a kind of electric current modification method being directed under non-ideal power grid based on one circle control, the modification method is for single
The three-phase inverter of period control；It is characterized by: when certain imbalance of three-phase voltage, by every phase current feedback signal |
i′x|, multiplied by the penalty coefficient k of the phase currentx, constitute electric current reconstructing and control signal iRx；Electric current reconstructing controls signal iRxAgain with electricity
The amplitude U for pressing outer ring output steady-state value to generatemCarrier wave compare, generate pwm signal to three-phase inverter under unbalanced power grid
Out-of-balance current effectively corrected.
2. a kind of electric current modification method being directed under non-ideal power grid based on one circle control according to claim 1,
It is characterized in including the following steps:
(1) when Voltage unbalance, power grid A, B, C three-phase voltage are as follows:
U can further be usedAUnified representation are as follows:
Three pole reactor electric current is respectively i in three-phase inverterA、iB、iC, pass through AC sampling resistance RsTo three pole reactor electric current iA、
iB、iCIt is sampled, obtains three pole reactor current sampling signal RsiA、RsiB、RsiC；Three-phase inverter based on one circle control
Electric current itself can completely track the variation of network voltage, by the electric current to three-phase inverter in power frequency period
Integral is to obtain above-mentioned parameter electric current expression-form, it may be assumed that
(2) reference current is determined: defined variable: detection electric current i 'AIt indicates are as follows:
The coefficient that scale operation module is calculated is expressed as kx, stagnant ring moulds block can retain the result of last operation i.e.: kx-1；
The output of signals revivification module is the reduction current i with unbalance voltage equal proportiontx, x represents A, B, C three-phase current；Three-phase electricity
Flowing reconfigurable control signal indicates are as follows:
In three-phase imbalance power grid, the amplitude and phase of three-phase voltage can all generate fluctuation, thus in the controls, then it needs
Medium voltage is selected by operation as standard value, carry out electric current amendment, after control enters closed-loop control, reference current
irefThe proportionality coefficient k that will be exported by stagnant ring moulds blockA-1, kB-1, kC-1With feedback current phase RsiAIt is multiplied, the selection mark of ginseng control voltage
Standard is denoted as:
Original state scale parameter kA-1=kB-1=kC-1=1, above formula can be rewritten are as follows:
(3) proportionality coefficient operation: after reference current has been determined, in order to keep each phase current close, therefore, by every electric current with
Reference current is compared to obtain proportionality coefficient:
K when into original stateA-1=kB-1=kC-1=1, therefore, the first time operation of above formula can be with abbreviation are as follows:
Due in one circle control:
Vm(1-dx)=| Rs·ix|
So available:
It can effectively reflect the imbalance of power grid by the operation to electric current, and then by control electric current, carry out corresponding
Out-of-balance current inhibits；
(4) electric current restores: being retained by the result of stagnant ring moulds block comparative example coefficient computing module operation, then each time
The proportionality coefficient and value and detection electric current i ' that new operation calculates the last time before startingAIt is multiplied, thus completely will be uneven
Out-of-balance current under power grid is restored, therefore, reduction current itxIt indicates:
itx=kx-1i′x=kx-1Rsix；
(5) the practical control signal of electric current is obtained:
(6) by the three pole reactor current sampling signal i in step (5)RA、iRB、iRCIt takes into computing module, obtains amplitude limit value letter
Number；For the control signal not overshoot of Guarantee control system, guarantee system stability, makes signal within the scope of controllable, by
Step (5) knows that required amplitude limit value size is calculated by computing module；
(7) in electronic power convertor DC voltage outer ring, electronic power convertor DC voltage reference valueWith it is straight
Flow side feedback voltage UdPressure difference signal e is exported after subtracteru, euIt indicates are as follows:
Amplitude of output of the pressure difference signal after voltage regulator PI control as carrier signal, the U known to one circle controlmHave
It is following to indicate:
Wherein Z is load impedance:
Z=Re+j(XL-XC)；
(8) the three-phase current reconfigurable control signal in step (7) after clipping is U with the amplitude generated by carrier wave generation modulem's
Carrier signal carries out signal by comparator and completes a business transaction generation pwm signal feeding bus, and then controls and open in electronic power convertor
Close the on-off of device.
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| CN112165264A (en) * | 2020-09-21 | 2021-01-01 | 哈尔滨工程大学 | Method for inhibiting current waveform distortion of three-phase VIENNA rectifier |
| CN112165263A (en) * | 2020-09-21 | 2021-01-01 | 哈尔滨工程大学 | Current harmonic suppression method for three-phase VIENNA rectifier |
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| CN111009897A (en) * | 2019-12-05 | 2020-04-14 | 神华粤电珠海港煤炭码头有限责任公司 | Power-saving protection device |
| CN112165264A (en) * | 2020-09-21 | 2021-01-01 | 哈尔滨工程大学 | Method for inhibiting current waveform distortion of three-phase VIENNA rectifier |
| CN112165263A (en) * | 2020-09-21 | 2021-01-01 | 哈尔滨工程大学 | Current harmonic suppression method for three-phase VIENNA rectifier |
| CN112165263B (en) * | 2020-09-21 | 2022-04-12 | 哈尔滨工程大学 | Current harmonic suppression method for three-phase VIENNA rectifier |
| CN112165264B (en) * | 2020-09-21 | 2022-04-12 | 哈尔滨工程大学 | Method for inhibiting current waveform distortion of three-phase VIENNA rectifier |
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Application publication date: 20191025 |