CN109149633A - Three-phase grid based on state feedback controls Current Decoupling method - Google Patents
Three-phase grid based on state feedback controls Current Decoupling method Download PDFInfo
- Publication number
- CN109149633A CN109149633A CN201810988402.5A CN201810988402A CN109149633A CN 109149633 A CN109149633 A CN 109149633A CN 201810988402 A CN201810988402 A CN 201810988402A CN 109149633 A CN109149633 A CN 109149633A
- Authority
- CN
- China
- Prior art keywords
- decoupling
- phase
- control
- grid
- state feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000004044 response Effects 0.000 claims abstract description 11
- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 7
- 238000013178 mathematical model Methods 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 6
- 238000011217 control strategy Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H02J3/383—
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present invention relates to a kind of three-phase grids based on state feedback to control Current Decoupling method, and this method is to reduce in cutting-in controld、qThe coupling of axis increases state feedback in input terminal, establishes the state equation of closed-loop system, can Decoupling Conditions and control law according to pole-assignment designv d 、v q , to realized、qShaft current decoupling, and give the detailed description that electric current decoupling process and compensating parameter determine, the correctness and validity of simulating, verifying this method.The method of the present invention is in the Grid-connected Control Strategy design of photovoltaic parallel in system, increase state feedback in the input terminal of control and constitutes closed-loop system, by the control law after the decision condition and system decoupling that decouple, realize Current Decoupling design, the response time of system effectively is reduced, while guaranteeing that the system after decoupling is with good stability.
Description
Technical field
It is about the three-phase based on state feedback in photovoltaic parallel in system the invention belongs to photovoltaic power generation grid-connecting technical field
Cutting-in control Current Decoupling method.
Background technique
As a kind of energy-saving clean generation mode, photovoltaic power generation technology has obtained recognizing for numerous countries in the world
It can, wherein Grid-connected Control Strategy becomes an important factor for influencing grid-connected performance and photovoltaic power generation in photovoltaic power generation grid-connecting field
One of widely applied difficult point of technology.Grid-connected Control Strategy can guarantee that inverter output is same with frequency with network voltage when grid-connected
Phase improves grid connection efficiency, reduces interference of the harmonic wave to power grid, and realization is stablized grid-connected.
Voltage, current double-ring cutting-in control are most common Grid-connected Control Strategies, and current control method is its core
One of technology is typically used as the inner ring of electrical power conversion control system, but finds that there are stronger for d, q axis by modeling analysis
Coupling phenomenon has seriously affected electric current loop and has increased in control structure to the response speed of output voltage, therefore in cutting-in control
Add Current Decoupling link, improve the response speed of system, for example superposition in three-phase static coordinate system and compensation principle realize
Electric current decoupling, feedback linearization and active interference inhibit power algorithm, PR decoupling control method, these algorithms have theoretical multiple
Miscellaneous, on-fixed switching frequency, implementation process is also very complicated, is not easy to the shortcomings that practical application.
In current open source literature, document [1] .Y.C.Yang, Z.F.Yu, X.Hu and M.J. Ding, " Split
Decoupling Control Method of Grid Connected Current in Three-phase
Converter,”Journal of Power Supply,vol.14,no.2,Mar. 2016,pp.31-34,DOI:
10.13234/j.issn.2095-2805.2016.2.31. proposes a kind of shunt current decoupling method, this is a kind of new think of
Road, but divide weight parameter and be difficult to determine.
Summary of the invention
The object of the present invention is to provide the three-phase grids fed back based on state to control Current Decoupling method, to reduce simultaneously network control
The coupling of d, q axis in system increases state feedback in input terminal, the state equation of closed-loop system is established, according to pole-assignment
Design can Decoupling Conditions and control law vd、vq, to realize that d, q shaft current decouple, and give electric current decoupling process and compensation ginseng
The determining detailed description of number, the correctness and validity of simulating, verifying this method.
In order to achieve the above objectives, the technical solution of the present invention is as follows:
Three-phase grid based on state feedback of the invention controls Current Decoupling method, includes the following steps:
Step 1, inverse according to the three-phase power grid voltage of three-phase grid-connected inverting system, three-phase grid electric current and three phase full bridge
Become three bridge arm output voltages of device, establishes the mathematical model of three-phase voltage source inverter, and the model is become from rest frame
It is changed to rotating coordinate system, obtains voltage ed、 eq；
Step 2, it is the influence for reducing d axis, q axis coupling phenomenon designs cutting-in control, establishes id、iqState equation, according to
State feedback decoupling condition transition status equation is the state equation under closed-loop system, can be decoupled according to pole-assignment design
Condition and control law vd、vq；
Step 3, increase feedback component in control ring input terminal, it is therefore an objective to reduce network voltage interference components to grid-connected shadow
It rings, calculates the biography letter G of belt current decouplingc(s), according to can Decoupling Conditions and control law, design belt current decoupling closed-loop parameters.
Further, step 1 specifically:
(1-1) acquires the three-phase power grid voltage e of three-phase grid-connected inverting systema、eb、ec, three-phase grid electric current ia、ib、ic,
Three bridge arm output voltage v of three-phase full-bridge invertera、vb、vc, establish the mathematical model of three-phase voltage source inverter；
Model is transformed into rotation from static coordinate according to three-phase static coordinate system to rotating coordinate system transition matrix by (1-2)
Turn coordinate, obtains voltage ed、eq；
Further, step 2 specifically:
(2-1), according to the three-phase grid electric current i of three-phase grid-connected inverting systema、ib、ic, circuit establishes id、iqState space
Equation；
(2-2) increases state feedback in the input terminal of cutting-in control, the state equation of closed-loop system is established, if Gc(s) it is
The transfer function matrix of closed-loop system；
(2-3) further considers the Decoupling Conditions that POLE PLACEMENT USING is met according to integral decoupled system；
(2-4) calculates the control law for realizing system decoupling using decoupling matrices.
Further, the Current Decoupling part in disclosed algorithm embodies in step 2, by increasing state feedback
Closed-loop system is constituted, by the control law after the decision condition and system decoupling of POLE PLACEMENT USING design closed-loop system decoupling, is realized simultaneously
Current Decoupling design in network control system.
Further, step 3 specifically:
(3-1) increases state feedback in the design of traditional cutting-in control, constitutes closed loop current and decouple block diagram, calculate closed loop
Pass letter Gc(s)；
(3-2) matches second-order optimum method of adjustment, and parameter is arranged, and computing system response parameter is closed after guaranteeing Current Decoupling
The stability of loop system.
Beneficial effects of the present invention:
It is anti-that the method for the present invention increases state in the Grid-connected Control Strategy design of photovoltaic parallel in system, in the input terminal of control
Feedback constitutes closed-loop system, by the control law after the decision condition and system decoupling that decouple, realizes Current Decoupling design, effectively reduces
Response time of system, while guaranteeing that the system after decoupling is with good stability.
Detailed description of the invention
Fig. 1 is the three-phase photovoltaic grid-connected system block diagram with Current Decoupling module.
Fig. 2 is the grid voltage orientation control block diagram with Current Decoupling module.
Fig. 3 is the control block diagram about d decoupler shaft.
Fig. 4 is the step response diagram of d shaft current control system.
Fig. 5 is the Bode diagram of open cycle system.
Specific embodiment
The present invention is described in detail with specific embodiment with reference to the accompanying drawing.
Referring to Fig. 1, the specific implementation step of the three-phase grid control Current Decoupling method of the invention based on state feedback
Are as follows:
Step 1, inverse according to the three-phase power grid voltage of three-phase grid-connected inverting system, three-phase grid electric current and three phase full bridge
Become three bridge arm output voltages of device, establishes the mathematical model of three-phase voltage source inverter, and the model is become from rest frame
It is changed to rotating coordinate system, obtains voltage ed、 eq；
(1-1) acquires the three-phase power grid voltage e of three-phase grid-connected inverting systema、eb、ec, three-phase grid electric current ia、ib、ic,
Three bridge arm output voltage v of three-phase full-bridge invertera、vb、vc, the mathematical model for establishing three-phase voltage source inverter is；
Model is transformed into rotation from static coordinate according to three-phase static coordinate system to rotating coordinate system transition matrix by (1-2)
Turn coordinate, obtains voltage ed、eq
Step 2, it is the influence for reducing d axis, q axis coupling phenomenon designs cutting-in control, is simplified using Current Decoupling algorithm
Controller design.Establish id、iqState equation is the shape under closed-loop system according to state feedback decoupling condition transition status equation
State equation, can Decoupling Conditions and control law v according to pole-assignment designd、vq；
(2-1), according to the three-phase grid electric current i of three-phase grid-connected inverting systema、ib、ic, circuit establishes id、iqState space
Equation:
Wherein
(2-2) increases state feedback in the input terminal of cutting-in control, then system inputs are as follows:
U (t)=- Fx (t)+Kv (t) (3)
Establish the state equation of closed-loop system:
If Gc(s) it is the transfer function matrix of closed-loop system:
Gc(s)=C (sI-A+BF)-1BR(5)
(2-3) further considers the Decoupling Conditions that POLE PLACEMENT USING is met according to integral decoupled system:
So having
It can be obtained according to above formula:
Wherein
c1=[1 0]；c2=[0 1]；
Since decoupling discrimination matrix D is considerable, the decoupling control rule in closed-loop system are as follows:
I.e.
Finally obtain closed loop decoupled system.
Linear reference input signal is arranged in (2-4):
According to decoupling matrices, derived system control law is as follows
Fig. 2 is the block diagram with the grid voltage orientation control system of Current Decoupling module.Using reactive current control side
Formula iq*=0, the unity power factor being connected with power grid is realized.By to three-phase voltage ea、eb、ecIt is sampled, by abc/ α
β is transformed to eα、eβ, obtain the phase angle of network voltage
To three-phase current ia、ib、icIt is sampled, dq shaft current i is transformed to by coordinated、 iq, then feedback arrives decoupling
Module.Decoupling module exports vd、vqBe converted to vα、vβ, finally, can be obtained by SVPWM module and export va、vb、vc, driving
Six power switch tubes of inverter.
Step 3, increase feedback component in control ring, it is therefore an objective to reduce network voltage interference components to grid-connected influence, meter
Calculate the biography letter G of belt current decouplingc(s), according to can Decoupling Conditions and control law, design belt current decoupling closed-loop parameters.
(3-1) increases state feedback in the design of traditional cutting-in control, constitutes closed loop current and decouple block diagram, about d axis solution
The control block diagram of coupling is as shown in Figure 3.The transmission function of sampling delay is
Gs(s)=1/ (Tss+1) (14)
TsIt is the sampling period of current closed-loop；Setting adjuster is that a parameter is KdProportioning element, it is fast to obtain system
Speed response；Network voltage is equivalent to exogenous disturbances, therefore feedforward compensation coefficient is Kf=1/Kpwm, KpwmIt is the equivalent increasing of inverter
Benefit.It is calculated by reduced parameter and negligible resistance R is obtained
Closed loop, which is calculated, according to Fig. 3 passes letter Gc(s)
Wherein
(3-2) matches second-order optimum method of adjustment, parameter is arrangedComputing system response parameter Kd:
Assuming that Udc=600v,R=0.1 Ω, L=5mH, Ts=100us can must be responded by 17 formulas
Parameter Kd=0.072.
The step response of d shaft current control system as shown in figure 4, it can be seen from the figure that stablizing the time is about 0.8ms,
Rise time is about 0.3ms.System has good step response characteristic；Fig. 5 is the Bode diagram of open cycle system, is shown
Phase margin is 65.6 degree when 4.54e+3rad/s, and according to Theory of Stability, the current closed-loop system after illustrating decoupling has good
Good stability.
Embodiment of the present invention is only that preferred embodiments of the present invention will be described, not to present inventive concept
It is defined with periphery, under the premise of not departing from design philosophy of the present invention, this field engineers and technicians are to skill of the invention
The all variations and modifications that art scheme is made, should all fall into protection scope of the present invention, the claimed technology contents of the present invention,
It is all described in the claims.
Claims (4)
1. the three-phase grid based on state feedback controls Current Decoupling method, which comprises the steps of:
Step 1, according to the three-phase power grid voltage of three-phase grid-connected inverting system, three-phase grid electric current and three-phase full-bridge inverter
Three bridge arm output voltages establish the mathematical model of three-phase voltage source inverter, and the model are transformed to from rest frame
Rotating coordinate system obtains voltage ed、eq；
Step 2, it is the influence for reducing d axis, q axis coupling phenomenon designs cutting-in control, establishes id、iqState equation, according to state
Feedback decoupling condition transition status equation is the state equation under closed-loop system, can Decoupling Conditions according to pole-assignment design
With control law vd、vq；
Step 3, increase feedback component in control ring, it is therefore an objective to reduce network voltage interference components to grid-connected influence, calculate band
The biography letter G of Current Decouplingc(s), according to can Decoupling Conditions and control law, design belt current decoupling closed-loop parameters.
2. the three-phase grid according to claim 1 based on state feedback controls Current Decoupling method, which is characterized in that step
1 specifically:
(1-1) acquires the three-phase power grid voltage e of three-phase grid-connected inverting systema、eb、ec, three-phase grid electric current ia、ib、ic, three-phase
Three bridge arm output voltage v of full-bridge invertera、vb、vc, establish the mathematical model of three-phase voltage source inverter；
Model is transformed into rotation from static coordinate and sat by (1-2) according to three-phase static coordinate system to rotating coordinate system transition matrix
Mark, obtains voltage ed、eq。
3. the three-phase grid according to claim 1 based on state feedback controls Current Decoupling method, which is characterized in that step
2 specifically:
(2-1), according to the three-phase grid electric current i of three-phase grid-connected inverting systema、ib、ic, circuit establishes id、iqState space equation；
(2-2) increases state feedback in the input terminal of cutting-in control, the state equation of closed-loop system is established, if GcIt (s) is closed loop
The transfer function matrix of system；
(2-3) further considers the Decoupling Conditions that POLE PLACEMENT USING is met according to integral decoupled system；
(2-4) calculates the control law for realizing system decoupling using decoupling matrices.
4. the three-phase grid according to claim 1 based on state feedback controls Current Decoupling method, it is characterised in that: step
3 specifically:
(3-1) increases state feedback in the design of traditional cutting-in control, constitutes closed loop current and decouple block diagram, calculates closed loop and passes letter Gc
(s)；
(3-2) matches second-order optimum method of adjustment, and parameter is arranged, and computing system response parameter guarantees closed loop system after Current Decoupling
The stability of system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810988402.5A CN109149633A (en) | 2018-08-28 | 2018-08-28 | Three-phase grid based on state feedback controls Current Decoupling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810988402.5A CN109149633A (en) | 2018-08-28 | 2018-08-28 | Three-phase grid based on state feedback controls Current Decoupling method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109149633A true CN109149633A (en) | 2019-01-04 |
Family
ID=64828542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810988402.5A Pending CN109149633A (en) | 2018-08-28 | 2018-08-28 | Three-phase grid based on state feedback controls Current Decoupling method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109149633A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112256046A (en) * | 2020-07-20 | 2021-01-22 | 武汉罗布科技有限公司 | Course control method for underwater vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852620A (en) * | 2015-02-25 | 2015-08-19 | 上海交通大学 | Three-phase voltage type pwm inverter control method |
-
2018
- 2018-08-28 CN CN201810988402.5A patent/CN109149633A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104852620A (en) * | 2015-02-25 | 2015-08-19 | 上海交通大学 | Three-phase voltage type pwm inverter control method |
Non-Patent Citations (3)
| Title |
|---|
| 刘维彬: ""三相光伏并网逆变器控制策略的研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 王多平: ""三相光伏并网逆变器的控制技术研究"", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 陈国璋等: ""PWM整流器瞬时功率PI控制与电流解耦控制"", 《广西大学学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112256046A (en) * | 2020-07-20 | 2021-01-22 | 武汉罗布科技有限公司 | Course control method for underwater vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108418253B (en) | Impedance modeling and stability analysis method of current control type virtual synchronous generator | |
| CN101534065B (en) | Asymmetric direct power control method of grid-connected three-phase voltage source converter | |
| Hu et al. | Impedance characteristic analysis and stability improvement method for DFIG system within PLL bandwidth based on different reference frames | |
| CN102223100A (en) | Control method of three-phase grid-connected inverter based on modified proportional resonant regulator | |
| CN107565840B (en) | The harmonic compensation control method of Cascade H bridge type photovoltaic combining inverter | |
| CN106655199B (en) | VSC-HVDC power control method for improving voltage stability | |
| CN107733269B (en) | Expand the square-wave compensation control method of Cascade H bridge type photovoltaic DC-to-AC converter range of operation | |
| CN111193291B (en) | Composite virtual synchronous machine control method suitable for unbalanced condition | |
| CN108418226B (en) | Reactive compensation control method of open-winding double-inverter photovoltaic power generation system | |
| CN104578167A (en) | Power feedforward control method for single stage type three-phase photovoltaic grid-connected inverter | |
| CN110311406A (en) | A kind of control method expanding cascaded H-bridges photovoltaic DC-to-AC converter range of operation | |
| WO2023066407A1 (en) | Method and apparatus for controlling three-phase four-bridge-arm auxiliary converter | |
| CN110365051A (en) | A kind of virtual synchronous motor control method of adaptive instruction filtering inverting | |
| CN107611971A (en) | For the net side inverter resonance full-order sliding mode control method of Voltage Harmonic distortion operating mode | |
| CN110676874A (en) | Direct-drive fan subsynchronous oscillation electrical quantity analysis method considering frequency coupling effect | |
| CN113629763B (en) | Current control method and system for medium-voltage direct-hanging energy storage converter under non-ideal power grid | |
| Bagi et al. | Power quality improvement using a shunt active power filter for grid connected photovoltaic generation system | |
| CN112448407A (en) | Impedance optimization control strategy for improving stability of grid-connected system under constant power control under bidirectional power flow | |
| CN109149633A (en) | Three-phase grid based on state feedback controls Current Decoupling method | |
| CN110970934B (en) | Grid-connected pre-synchronization control device for AC-DC bidirectional power converter in hybrid micro-grid | |
| CN112532094A (en) | Compound control method of T-type three-level NPC inverter | |
| CN109450316B (en) | Method and system for simplifying direct-drive fan based on PWM | |
| CN113162117B (en) | Method for designing bandwidth of grid-connected inverter controller under weak grid | |
| CN109361235A (en) | The alternate Power balance control method of three-phase cascaded H-bridges photovoltaic DC-to-AC converter | |
| Peng et al. | Optimization strategy and stability analysis of grid-connected inverter based on PLL positive sequence grid voltage feedforward in weak grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190104 |