CN110350577A - Three-phase grid-connected inverter control system and method based on QPCI control - Google Patents
Three-phase grid-connected inverter control system and method based on QPCI control Download PDFInfo
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- CN110350577A CN110350577A CN201910555361.5A CN201910555361A CN110350577A CN 110350577 A CN110350577 A CN 110350577A CN 201910555361 A CN201910555361 A CN 201910555361A CN 110350577 A CN110350577 A CN 110350577A
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- connected inverter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac 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
- H02M7/537—Conversion of dc power input into ac 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac 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, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
Abstract
The invention discloses the control system of the three-phase grid-connected inverter based on QPCI controller and method, control system includes: DC power supply, and the DC power supply is used to provide direct current to three-phase grid inverter bridge, and is connected with three-phase grid-connected inverter；Three-phase grid-connected inverter, the three-phase grid-connected inverter include control system, main circuit and inversion filter circuit；The control system includes QPCI controller and pulse-width modulator, and the inversion filter circuit is connected to through pulse-width modulator with main circuit after QPCI controller；The current value that the QPCI controller is used to acquire the current value of DC power supply output and setting or dispatching of power netwoks instruction export and the deviation of signal for calculating the two, the pulse-width modulator obtains driving signal according to above-mentioned deviation of signal, controls the output of three-phase grid-connected inverter.
Description
Technical field
The invention belongs to distributed power generations and micro-capacitance sensor technology, and in particular to a kind of three-phase grid based on QPCI control
Inverter control system and method.
Background technique
In recent years, as global energy crisis is broken out and environmental pollution is getting worse, Renewable Energy Development power generation
A kind of international trend is had become, grid-connected inverters generation technology is by people's extensive concern.Three-phase grid-connected inverter is as distribution
The interface arrangement of formula power generation and power grid, needs to solve a series of technological challenges, the grid-connected fortune of Lai Shixian three-phase inverter efficient stable
Row.Therefore, it is highly desirable to enter further investigation to the gird-connected inverter in micro-capacitance sensor.
Direct Current Control is the most common control strategy of gird-connected inverter, is also three-phase grid-connected inverter control system
In critical issue.Specifically, in practical applications, structure is simple, easy to accomplish for current ratio integration control.In leverage linear
In load, PI controller is with good performance under synchronous rotary (dq) coordinate system；Under nonlinear load, due to harmonic wave point
The presence of amount, there are steady-state errors.From PI control, there are of ac controls steady-state error, on the basis of PI controller
On, propose it is a kind of based on α β rest frame ratio plural number integration control (proportional complex integral,
PCI), of ac can be eliminated and control existing steady-state error.But that of ac only may be implemented at fundamental frequency is steady for PCI control
State regulating error, otherwise gain can be smaller rapidly, causes biggish deviation.Secondly PCI controls the infinite gain at fundamental frequency
There is challenge to the stability of system.
Summary of the invention
The technical problem to be solved in the present invention is to provide the three-phase grid-connected inverter control systems controlled based on QPCI, use
QPCI controller, so that system output quantity follows reference quantity, substantially not disturbed momentum effects under the controller；And give base
QPCI control strategy under three-phase abc coordinate system；Using above scheme, coordinate transform operation is reduced, so that control structure is simple
List is easily achieved.
In order to achieve the above objectives, technical scheme is as follows:
The control system of three-phase grid-connected inverter based on QPCI controller characterized by comprising
DC power supply, the DC power supply are used to provide the input domain of direct current, and and three-phase to three-phase grid-connected inverter
Parallel network reverse bridge is connected；
Three-phase grid-connected inverter, the three-phase grid-connected inverter include control system, main circuit and inversion filter circuit,
The DC power supply is connect with the input terminal of the input terminal of control system and main circuit respectively, and the main circuit is filtered by inversion
It is connect respectively with control system, load and power grid after wave circuit, the output end of the control system and the input terminal of main circuit
Connection；
The control system includes QPCI controller and pulse-width modulator, and the inversion filter circuit passes through QPCI
It is connected to through pulse-width modulator with main circuit after controller；
The QPCI controller is used to acquire the current value that DC power supply exports and setting or dispatching of power netwoks instruction output
Current value and the deviation of signal that both calculates, the pulse-width modulator driving signal is obtained according to above-mentioned deviation of signal,
Control the output of three-phase grid-connected inverter.
As a further improvement of the present invention, the control system further includes Current Voltage acquisition module, the electric current electricity
Pressure acquisition module is connect with the output end of the output end of DC power supply and inversion filter circuit respectively.
Using Current Voltage acquisition module, convenient for acquiring more accurately Current Voltage value.
As a further improvement of the present invention, the Current Voltage acquisition module includes the DC voltage Hall being arranged in parallel
Sensor, DC current Hall sensor, AC voltage transformer and alternating current Hall sensor, the DC voltage is suddenly
Your sensor, DC current Hall sensor are connect with the output end of DC current respectively, the AC voltage transformer and
Alternating current Hall sensor is connect with the output end of inversion filter circuit respectively.
In the present embodiment, big signal is converted into small magnitude using the principle of the raw electricity of magnetic by Hall sensor, and AC mutual induction
Device utilizes the principle of similar transformer, and voltage is dropped in the range of DSP can sample.
As a further improvement of the present invention, further include power driving circuit, the power driving circuit respectively with pulse
Width modulator and main circuit connection.
As a further improvement of the present invention, the power driving circuit includes isolation DC-DC module and HCPL-3120
Light is every driving chip, for realizing the on-off between pulse-width modulator and main circuit.
As a further improvement of the present invention, three are also disposed between the inversion filter circuit and power grid to be isolated
The output with inversion filter circuit respectively of transformer and three-phase regulator, the three-phase isolation transformer and three-phase regulator
The connection of the input terminal of end and power grid.
Pressure regulator can reduce inverter output voltage, reduce security risk, and isolating transformer can then weaken and come from
The impact of power grid.
The invention also discloses the control methods of the three-phase grid-connected inverter based on QPCI controller, comprising the following steps:
1) it the calculating of deviation signal: when three-phase grid-connected inverter is in transient state, is controlled by the QPCI in control system
Device calculates the difference of three-phase grid reference current value and three-phase grid output current value, obtains deviation signal, the three-phase grid
Reference current value is to be manually set or instruct the current value obtained according to dispatching of power netwoks, and the three-phase grid output current value is
The current value of alternating current before input power grid；
2) calculating of output signal: above-mentioned deviation signal is calculated by QPCI controller, obtains output signal ya、
ybAnd yc；
3) generation of driving signal: by above-mentioned output signal ya、ybAnd ycAs modulated signal, by above-mentioned modulated signal
It send respectively into pulse-width modulator, the comparison operation of triangular carrier and modulating wave is carried out in pulse-width modulator, is obtained
To driving signal, the control of three-phase grid-connected inverter output is realized.
As a further improvement of the present invention, in the generation of the step 3) driving signal, the triangular carrier and modulation
The comparison operation of wave specifically: carry out triangular carrier peak value in PWM signal generator and modulate crest value to do difference operation.
As a further improvement of the present invention, in the generation of the step 3) driving signal, when modulation crest value is greater than three
When the crest value of angle, the driving signal of high level is exported, when modulating crest value less than triangle crest value, exports low level driving
Signal.
Beneficial effects of the present invention are as follows:
In the present invention, QPCI control can be realized under two-phase α β coordinate system, can also be real under three-phase abc coordinate system
It is existing.Three-phase abc coordinate system QPCI control simplifies control structure, eliminates compared with two-phase α β coordinate system QPCI control
Clarke transformation and its transform operation.In actual use, the purpose of Clark conversion is exactly by the abc coordinate of three phase static
The static α β coordinate system of two-phase is converted to, and the purpose of the application should be reduction clark transformation, and then directly in three phase static
Abc coordinate under carry out QPCI control.
In the present invention, by the information such as acquisition DC power supply and the current value of load for needing to power, then by straight
The operation connect, obtains modulated signal, and the control of the current value exported to three-phase grid-connected inverter is realized in conjunction with PWM signal generator
System.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural principle of the control system of the three-phase grid-connected inverter provided by the invention based on QPCI controller
Figure；
Fig. 2 is the circuit diagram of the control system of the three-phase grid-connected inverter provided by the invention based on QPCI controller；
Fig. 3 is the circuit diagram of Current Voltage acquisition module provided by the invention；
Fig. 4 is the circuit diagram of power driving circuit provided by the invention；
Fig. 5 is the control system of the three-phase grid-connected inverter provided by the invention in the prior art based on QPCI controller
Structure principle chart；
Fig. 6 is one of the state of a control figure of embodiment 2 provided by the invention；
Fig. 7 is the two of the state of a control figure of embodiment 2 provided by the invention；
Fig. 8 is the three of the state of a control figure of embodiment 2 provided by the invention；
Fig. 9 is the three-phase abc coordinate system bias vector composite diagram in embodiment 2 provided by the invention；
Figure 10 is the calculating figure that plural number j is realized under the three-phase abc coordinate system in embodiment 2 provided by the invention；
Figure 11-a is three-phase power grid voltage phase locking process variation diagram provided by the invention；
Figure 11-b is the variation diagram of three-phase reference current provided by the invention, grid-connected current and offset current；
Figure 11-c is a phase network voltage phase locking process variation diagram provided by the invention.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
Embodiment 1
Referring to shown in attached drawing 1-5, the control system of the three-phase grid-connected inverter provided by the invention based on QPCI controller,
Include:
DC power supply, the DC power supply are used to provide the input of direct current to three-phase grid-connected inverter, and simultaneously with three-phase
Net inverter bridge is connected；
Three-phase grid-connected inverter, the three-phase grid-connected inverter include control system, main circuit and inversion filter circuit,
The DC power supply is connect with the input terminal of the input terminal of control system and main circuit respectively, and the main circuit is filtered by inversion
It is connect respectively with control system, load and power grid after wave circuit, the output end of the control system and the input terminal of main circuit
Connection；
Referring to shown in attached drawing 1, in the present embodiment, DC power supply is uncontrollable rectification module；And main circuit uses power master
Circuit module, inversion filter circuit use inversion filter module.
The control system includes QPCI controller and pulse-width modulator, and the inversion filter circuit passes through QPCI
It is connected to through pulse-width modulator with main circuit after controller；Referring to shown in attached drawing 2, in the present embodiment, pulse-width modulator
For PWM module, and power main circuit module, that is, IPM module.
The QPCI controller is used to acquire the current value that DC power supply exports and setting or dispatching of power netwoks instruction output
Current value and the deviation of signal that both calculates, the pulse-width modulator driving signal is obtained according to above-mentioned deviation of signal,
Control the output of three-phase grid-connected inverter.
Specifically, main circuit uses power main circuit, and direct current can be converted to exchange.In the present embodiment, in order to match
It closes laboratory to use, DC power supply uses uncontrollable rectification module.
In the present embodiment, QPCI controller is realized under three-phase abc coordinate system, relative to traditional QPCI, is saved
Clarke transformation and inverse transformation, simple control structure, improve the response speed of system.
As a further improvement of the present invention, the control system further includes Current Voltage acquisition module, the electric current electricity
Pressure acquisition module is connect with the output end of the output end of DC power supply and inversion filter circuit respectively.
Using Current Voltage acquisition module, convenient for acquiring more accurately Current Voltage value.
Referring to shown in attached drawing 3, the Current Voltage acquisition module specifically includes the DC voltage hall sensing being arranged in parallel
Device, DC current Hall sensor, AC voltage transformer and alternating current Hall sensor, the DC voltage Hall pass
Sensor, DC current Hall sensor are connect with the output end of DC current respectively, the AC voltage transformer and exchange
Current Hall sensor is connect with the output end of inversion filter circuit respectively.
In the present embodiment, big signal is converted into small magnitude using the principle of the raw electricity of magnetic by Hall sensor, and AC mutual induction
Device utilizes the principle of similar transformer, and voltage is dropped in the range of DSP can sample.
Using DC voltage Hall sensor (VSM025A), DC current Hall sensor (HDC-10SY), alternating current
Mutual inductor (DL-PT202H1), alternating current Hall sensor (HX-10-P) operational amplifier signal conditioning circuit are pressed, it will be practical
Voltage, current value be converted to the voltage range that can sample of DSP control chip.Connection relationship is shown in attached drawing 3, Hall sensor benefit
With the principle of the raw electricity of magnetic, big signal is converted into small magnitude, and D.C mutual-inductor utilizes the principle of similar transformer, by voltage drop
In the range of being sampled to DSP
Further, further include power driving circuit, the power driving circuit respectively with pulse-width modulator and
Main circuit connection.
Referring to shown in attached drawing 4, the power driving circuit includes isolation DC-DC module and HCPL-3120 light every driving core
Piece, for realizing the on-off between pulse-width modulator and main circuit.
Further, three-phase isolation transformer and three-phase are also disposed between the inversion filter circuit and power grid
Pressure regulator, the three-phase isolation transformer and three-phase regulator are defeated with the output end of inversion filter circuit and power grid respectively
Enter end connection.
Pressure regulator can reduce inverter output voltage, reduce security risk, and isolating transformer can then weaken and come from
The impact of power grid.
The invention also discloses the control methods of the three-phase grid-connected inverter based on QPCI controller, comprising the following steps:
1) it the calculating of deviation signal: when three-phase grid-connected inverter is in transient state, is controlled by the QPCI in control system
Device calculates the difference of three-phase grid reference current value and three-phase grid output current value, obtains deviation signal, the three-phase grid
Reference current value is to be manually set or instruct the current value obtained according to dispatching of power netwoks, and the three-phase grid output current value is
The current value of alternating current before input power grid；
2) calculating of output signal: above-mentioned deviation signal is calculated by QPCI controller, obtains output signal ya、
ybAnd yc；
3) generation of driving signal: by above-mentioned output signal ya、ybAnd ycAs modulated signal, by above-mentioned modulated signal
It send respectively into pulse-width modulator, the comparison operation of triangular carrier and modulating wave is carried out in pulse-width modulator, is obtained
To driving signal, the control of three-phase grid-connected inverter output is realized.
In actual use, when electric current tends to stable state, then deviation signal is not present, and when transient state, then there is certain deviation
Signal exists.
Further, in the generation of the step 3) driving signal, the comparison operation of the triangular carrier and modulating wave has
Body are as follows: carry out triangular carrier peak value in PWM signal generator and modulate crest value to do difference operation.
Further, in the generation of the step 3) driving signal, when modulating crest value greater than triangle crest value, output
The driving signal of high level exports low level driving signal when modulating crest value less than triangle crest value.
Embodiment 2
Referring to shown in attached drawing 1-2, in the present invention, the three-phase grid-connected inverter control system based on QPCI controller, comprising:
Three-phase grid-connected inverter control system is by three-phase regulator, three-phase isolation transformer and three-phase grid as shown in Figure 1:
Inverter composition, and three-phase grid-connected inverter by DSP core core, the periphery DSP conditioning module, power driver module, do not control it is whole
Three-phase bridge power main circuit, voltage and current sampling module, LC filter module and the auxiliary switching power supply of flow module, IGBT composition
Composition.
Specifically, referring to shown in attached drawing 1, firstly, using the output of uncontrollable rectification module as DC source, output meets IGBT
The end DC of the three-phase bridge power main circuit of composition, the ac output end of three phase inverter bridge power main circuit connect LC filter module,
The output of LC filter module terminates three-phase balancing load, then accesses power grid through three-phase isolation transformer and pressure regulator.
Meanwhile it being additionally provided with DSP and signal processing module, it is connect by power driver module with main circuit module, and
The output end of uncontrollable rectification module is connect after passing through voltage and current acquisition module with DSP and signal processing module；Voltage and current
Acquisition module acquires the voltage and current of inversion filter module output simultaneously；
In the present embodiment, uncontrollable rectification module: being that direct current sends power main circuit module to by AC rectification；Function
Rate main circuit module is used to direct current being converted to alternating current by inversion；Power driver module is used for the control signal of DSP
Amplification sends power main circuit module to；Inversion filter module: the alternating current that power main circuit module is exported is delivered to load
Or power grid；Voltage and current acquisition module is used for sampled voltage and electric current, is conveyed to DSP and signal processing module is handled；
And DSP and signal processing module are then used for the execution that DSP is mainly used for control algolithm.
In the present embodiment, the DSP model uses DSP28335.
As shown in Figure 2；First by three-phase grid reference current Ia *、Ib*、Ic *Electric current I is exported with three-phase grida、Ib、IcInto
Row does difference operation (at this time that is, seeking the difference of three-phase grid reference current value Yu three-phase grid output current value.Such as Ia *-Ia's
Value is the difference of the two.), obtain deviation signal ea、eb、ec, output signal y is obtained using general QPCI controllera、 yb、
yc, send the signal as modulated signal to PWM signal generator, triangular carrier is compared with modulating wave, generates 3 pairs of complementations
Symmetrical and 120 ° of phase phase difference of driving signal, the inverter for controlling closed-loop current control export the grid-connected electricity of three phase sine
Stream.
Triangular carrier and modulating wave are compared, really one kind does difference operation (by triangular carrier and modulating wave
Peak value carries out doing difference operation, obtains difference.).When modulating wave is greater than carrier wave, PWM module exports high level；It (is identified on controller
Low and high level be brake, high level general provision is 5V or more, and low level is 0V or so.2, the voltage value on different circuits
Not identical, if it is the digital circuit of 5V power supply, high level is exactly 5V, or close to 5V.Low level is exactly ' nothing ', is exactly 0V or connects
Nearly 0V.3, the high level of controller is logical, and low level is control.) and when modulating wave is less than carrier wave, PWM module exports low level.Its
Also referred to as SPWM modulation, but in practical application, only need to be by modulation wave signal as the duty ratio of PWM module.
Three kinds of Fig. 6-Fig. 8 are based on abc coordinate system QPCI structure control block diagram, and the form of Fig. 8 is more preferable, and reason is abc seat
For the lower control block diagram of mark system itself compared with α β coordinate system relative simplicity, next Fig. 6 is the control block diagram of most initial, Fig. 7 be by
The control block diagram of decoupling, and Fig. 8 be on the basis of Fig. 7, use for reference three-phase system in three phase variables can with two variables into
The characteristics of row indicates realizes the control that also may be implemented with two QPCI controllers to three-phase system.For after all, Fig. 8 is in reality
Now, control structure is simpler, and operand is smaller.
As shown in Figure 7: total output is ya+yb+yc.The characteristics of being indicated with two variables due to three phase variables,
That is: yc=-ya-yb.So the representation of Fig. 8 can be converted into, general output is remained unchanged.
In a preferred embodiment of the invention, the QPCI controller is plural domain controller.
QPCI control can be realized under two-phase α β coordinate system, can also realize under three-phase abc coordinate system；Emulation is opened
When the beginning, locking phase is carried out to network voltage using the phaselocked loop of double Second Order Generalized Integrator algorithms, makes inverter output tracking power grid
Voltage, locking phase is completed after several periods, close circuit breaker, while being increased to constant current, is completed simultaneously network process, is infused to power grid
Enter power.
Fig. 5 is α β coordinate system QPCI control structure figure.
Referring to attached drawing 5 it is found that in the prior art, in two-phase stationary coordinate system (α β coordinate system), being become by Clarke
It changes, grid-connected current error signal ea、eb、ecBecome the current error signal e under two-phase stationary coordinate system systemα、eβ, then pass through
QPCI controller, wherein QPCI controller is that plural domain controller is compared because there is plural number j with analog- and digital-ization method
Hardly possible is realized.Plural j is that an amplitude is constant but 90 ° of phase shift of physical quantity.In two-phase stationary coordinate system, it is assumed that there are just
Alternating quantity xαAnd xβFor intermediate variable, therefore xα=jxβ, xβ=-jxα, realized using the coupling that this equation is established between α β axis multiple
Number j.Two-phase stationary coordinate system QPCI structure control block diagram is as shown in figure 5, obtain output signal y by QPCI controllerαAnd yβ,
The output signal y under three-phase static coordinate system is obtained by Clarke inverse transformation againa、yc, it is used as modulated signal.
As can be seen from FIG. 5, it under α β coordinate system, realizes QPCI control, Clarke transformation and inverse transformation cooperation is needed to realize,
Increase system operations amount.In order to be further simplified control structure, Fig. 6, Fig. 7, Fig. 8 will not pass through Clarke transformation and its inversion
It changes, directly in the specific implementation process of three-phase static coordinate system abc.
Fig. 6 is three-phase abc coordinate system QPCI control structure figure I；
For the realization process of three-phase abc coordinate system QPCI control, controlled first according to the two-phase stationary coordinate system QPCI of Fig. 5
Structure chart processed derives mathematical model of the QPCI controller at rest frame abc, in conjunction with three-phase system feature, building
Structure chart is realized in QPCI control under three-phase abc coordinate system out.
As shown in Figure 5, the grid-connected current error signal e under three-phase abc coordinate systema、eb、ecBy etc. amplitudes Clarke become
Get the current error signal e under two-phase stationary coordinate system in returnα、eβ, can be indicated with formula are as follows:
Current error signal e under the action of QPCI controller, under two-phase static coordinateα、eβ, be converted to two-phase
Output signal y under rest frameα、yβ, can be indicated with formula are as follows:
The Clarke inverse transformation for the amplitudes such as utilizing, by the output signal y under α β coordinate systemα、yβTransform to three-phase abc coordinate
Output signal y under systema、yb、yc, can be indicated with formula are as follows:
Joint type (6)-(8) can obtain the grid-connected current error signal e under three-phase abc coordinate systema、 eb、ecTo three-phase abc
Output signal y under coordinate systema、yb、ycConversion relational expression are as follows:
Utilize three-phase abc coordinate system signal ea、eb、ecAmplitude is equal and 120 ° of principles of phase shift, carry out Vector modulation as schemed
It is three-phase abc coordinate system bias vector composite diagram shown in 9.
After Vector modulation, formula (9) be can simplify are as follows:
It will be clear that the grid-connected current error signal e under three-phase abc coordinate systema、eb、 ecTo three-phase abc coordinate system
Under output signal ya、yb、ycIt is independent from each other, can be controlled separately through QPCI, be indicated with structural block diagram such as Fig. 6
It is shown.
Figure 10 is three-phase abc coordinate system QPCI control structure figure II；
As shown in figure 8, it is the calculating figure for realizing plural number j under three-phase abc coordinate system, state variable x is utilizedbAnd xcIt carries out
Subtract each other, is equivalent to state variable xaAmplitude increaseTimes and 90 ° of phase shift.
Utilize the characteristic, variable xa、xb、xcRelationship can be represented by the formula:
Plural j is realized in convolution (11), the coupling established between abc axis, so that three-phase abc coordinate system QPCI is controlled
Structure chart is converted into structure chart shown in Fig. 7 from Fig. 6.
Fig. 8 is three-phase abc coordinate system QPCI control structure figure III；
The characteristics of being indicated with two variables due to three phase variables in three-phase system, it may be assumed that yc=-ya-yb.Cause
This can also use two QPCI controllers to realize the control to three-phase system in three-phase abc rest frame, that is, realize this
The control of invention.
In the present invention, for the realization process of three-phase abc coordinate system QPCI control, first according to the static seat of the two-phase of Fig. 8
Mark system QPCI control structure figure derives mathematical model of the QPCI controller at rest frame abc, in conjunction with three-phase system
Feature constructs QPCI control under three-phase abc coordinate system and realizes structure chart.
Two-phase stationary coordinate system in comparison diagram 5 uses 3 using the abc coordinate system in two QPCI controls and Fig. 6
QPCI controller, the characteristics of being indicated with two variables in conjunction with three phase variables in three-phase system, therefore can be three
Phase abc rest frame also uses two QPCI controllers to realize the control to three-phase system, and control structure figure is as shown in Figure 7.
In conclusion QPCI control can be realized under two-phase α β coordinate system, it can also be real under three-phase abc coordinate system
It is existing.Three-phase abc coordinate system QPCI control simplifies control structure, eliminates compared with two-phase α β coordinate system QPCI control
Clarke transformation and its transform operation.
The invention discloses a kind of energy transmission technology fields, in particular to a kind of to use in three-phase grid-connected inverter
The control method of the quasi- ratio plural number integral of abc coordinate system, this control method is for optimizing in three-phase grid-connected inverter control system
Control strategy.Control method provided by the invention reaches the mesh of reduction operation by proposing quasi- ratio plural number integration control
, it is controlled relative to PCI, attenuation degree obviously weakens near fundamental frequency, overcomes PCI control and exists surely near fundamental frequency
The problem of state error.The control method is to derive that QPCI controller exists on the basis of α β coordinate system QPCI control structure figure
Mathematical model under rest frame abc constructs QPCI control knot under three-phase abc coordinate system in conjunction with three-phase system feature
Composition.Control strategy provided by the invention can reduce coordinate transform operation in three-phase grid-connected inverter control system, so that control
Structure processed is simple, is easily achieved.
Referring to attached drawing 11-a to 11-c, make brief analysis from the temporary steady-state value of grid-connected current, transient state time is shorter, and impact is got over
Small, dynamic response effect is better, and for the waveform of stable state, mainly see that the difference of setting value and output, difference are smaller, stable state effect
Fruit is better.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (9)
1. the control system of the three-phase grid-connected inverter based on QPCI controller characterized by comprising
DC power supply, the DC power supply for give three-phase grid-connected inverter provide direct current, and with three-phase grid-connected inverter phase
Even；
Three-phase grid-connected inverter, the three-phase grid inverter bridge device include control system, main circuit and inversion filter circuit, institute
It states DC power supply to connect with the input terminal of the input terminal of control system and main circuit respectively, the main circuit is filtered by inversion
It is connect respectively with control system, load and power grid after circuit, the output end of the control system and the input terminal of main circuit connect
It connects；
The control system includes QPCI controller and pulse-width modulator, and the inversion filter circuit is controlled by QPCI
It is connected to through pulse-width modulator with main circuit after device；
The QPCI controller is used to acquire the current value of DC power supply output and the electricity of setting or dispatching of power netwoks instruction output
Flow valuve and the deviation of signal for calculating the two, the pulse-width modulator obtain driving signal according to above-mentioned deviation of signal, control
The output of three-phase grid-connected inverter.
2. the control system of the three-phase grid-connected inverter according to claim 1 based on QPCI controller, which is characterized in that
The control system further includes Current Voltage acquisition module, the Current Voltage acquisition module respectively with the output end of DC power supply
And the output end connection of inversion filter circuit.
3. the control system of the three-phase grid-connected inverter according to claim 2 based on QPCI controller, which is characterized in that
The Current Voltage acquisition module includes the DC voltage Hall sensor being arranged in parallel, DC current Hall sensor, exchange
Voltage transformer and alternating current Hall sensor, the DC voltage Hall sensor, DC current Hall sensor point
It is not connect with the output end of DC current, the AC voltage transformer and alternating current Hall sensor are filtered with inversion respectively
The output end of wave circuit connects.
4. the control system of the three-phase grid-connected inverter according to claim 1 based on QPCI controller, which is characterized in that
It further include power driving circuit, the power driving circuit is connect with pulse-width modulator and main circuit respectively.
5. the control system of the three-phase grid-connected inverter according to claim 4 based on QPCI controller, which is characterized in that
The power driving circuit includes isolation DC-DC module and HCPL-3120 light every driving chip, for realizing pulse width modulation
On-off between device and main circuit.
6. the control system of the three-phase grid-connected inverter according to claim 1 based on QPCI controller, which is characterized in that
Three-phase isolation transformer and three-phase regulator are also disposed between the inversion filter circuit and power grid, described three are separated by
It is connect respectively with the input terminal of the output end of inversion filter circuit and power grid from transformer and three-phase regulator.
7. the control method of the three-phase grid-connected inverter based on QPCI controller, which comprises the following steps:
The calculating of deviation signal: it when three-phase grid-connected inverter is in transient state, is calculated by the QPCI controller in control system
The difference of three-phase grid reference current value and three-phase grid output current value obtains deviation signal, and the three-phase grid is with reference to electricity
Flow valuve is to be manually set or instruct according to dispatching of power netwoks the current value obtained, and the three-phase grid output current value is input electricity
The current value of alternating current before net；
The calculating of output signal: above-mentioned deviation signal is calculated by QPCI controller, obtains output signaly a 、y b Andy c ；
The generation of driving signal: by above-mentioned output signaly a 、y b Andy c As modulated signal, above-mentioned modulated signal is sent respectively
Into pulse-width modulator, the comparison operation of triangular carrier and modulating wave is carried out in pulse-width modulator, is driven
Signal realizes the control of three-phase grid-connected inverter output.
8. the control method of the three-phase grid-connected inverter according to claim 7 based on QPCI controller, which is characterized in that
In the generation of the step 3) driving signal, the comparison operation of the triangular carrier and modulating wave specifically: occur in pwm signal
Triangular carrier peak value is carried out in device and that modulates crest value does difference operation.
9. the control method of the three-phase grid-connected inverter according to claim 8 based on QPCI controller, which is characterized in that
In the generation of the step 3) driving signal, when modulating crest value greater than triangle crest value, the driving signal of high level is exported,
When modulating crest value less than triangle crest value, low level driving signal is exported.
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