CN108123462A - A kind of Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor - Google Patents
A kind of Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor Download PDFInfo
- Publication number
- CN108123462A CN108123462A CN201611074223.8A CN201611074223A CN108123462A CN 108123462 A CN108123462 A CN 108123462A CN 201611074223 A CN201611074223 A CN 201611074223A CN 108123462 A CN108123462 A CN 108123462A
- Authority
- CN
- China
- Prior art keywords
- voltage
- capacitance sensor
- linear quadratic
- unbalance
- isolated island
- 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
Classifications
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- 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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses a kind of Voltage unbalance linear quadratic control methods of isolated island micro-capacitance sensor, including secondary controller, improve V/f controls, four parts of virtual impedance ring, voltage and current ring control.The present invention controls the voltage of distributed generation resource by linear quadratic control, and the unbalance voltage of PCC points is compensated, and realizes electric current, the zero steady state error control of voltage.The present invention realizes the accurate distribution of reactive power not only from the voltage deviation of global angle compensation PCC points.Voltage unbalance can also be compensated, and dynamic property is good, illustrates the correctness and validity of this method.
Description
Technical field
The present invention relates to a kind of isolated island micro-capacitance sensor more particularly to a kind of Voltage unbalance linear quadratic control sides of isolated island micro-capacitance sensor
Method.
Background technology
Micro-capacitance sensor is a kind of by distributed generation resource, energy storage device, load, current transformer and monitoring and protecting device organic combination
Small-sized electric system together.Effective carrier of the micro-capacitance sensor as distributed generation resource is distributed generation resource access power distribution network
Important way, provide effective way and the important component of intelligent grid for local consumption regenerative resource.But
In the grid-connected low pressure micro-capacitance sensor of voltage source inverter, the equity control based on droop characteristic brings the inclined of voltage and frequency
The generally existing of difference, three-phase load asymmetry and nonlinear load causes micro-capacitance sensor support voltage three-phase imbalance occur, from
And more energy loss is caused, influence the stability of micro-grid system.When voltage has serious imbalance, to equipment as felt
Induction motor, Power electronic converter and speed-regulating driver etc. have significant negative impact.Therefore, International Electrotechnical Commission（IEC）
Voltage unbalance factor should be limited within 2% in regulation electric system, according to national standard《Power quality three-phase voltage allows uneven
Degree》Regulation, electric system point of common coupling normal voltage degree of unbalancedness permissible value be 2%, must not exceed 4% in short-term；It is connected to public affairs
Each user of tie point altogether, causes this normal voltage degree of unbalancedness permissible value to be generally 1.3%.Therefore, micro-capacitance sensor electricity is studied
Press imbalance compensation strategy extremely urgent.
The compensation of existing unbalance voltage mainly by connect electric energy regulator to circuit inject negative sequence voltage or
Imbalance compensation is realized by electric energy regulator compensated line electric current in parallel, but so to the micro-capacitance sensor of multi-inverter
It is of high cost and be easy to cause adjuster overcurrent condition.And micro-capacitance sensor can be by adjusting distributed generation resource（distributed
generator,DG）The amplitude and phase of inverter output voltage, the active and reactive power that adjustment DG is injected into micro-capacitance sensor,
To support micro-capacitance sensor voltage.
The content of the invention
In order to overcome the problems, such as Voltage unbalance existing for isolated island micro-capacitance sensor, the present invention proposes a kind of electricity of isolated island micro-capacitance sensor
The uneven linear quadratic control method of pressure.
The technical solution adopted by the present invention to solve the technical problems is：
The Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor, including secondary controller, improve V/f controls, virtual impedance ring,
Voltage and current ring controls four parts.
The secondary controller includes positive-negative sequence extraction and unbalance factor calculates two parts.
The improvement V/f controls change output angular frequency by adjusting active power, and then realize phase difference of voltage
Control.
The virtual impedance ring can offset a part of line resistance, so as under same effect, reduce virtual impedance
Value, improve quality of voltage.
The voltage and current ring control is controlled using quasi- ratio resonance PR, is modulated by SVPWM, is controlled voltage and current
Value realizes zero steady-state error.
The beneficial effects of the invention are as follows：The present invention controls the voltage of distributed generation resource by linear quadratic control, to PCC
The unbalance voltage of point is compensated, and realizes electric current, the zero steady state error control of voltage.The present invention is not only from global angle compensation
The voltage deviation of PCC points, and realize the accurate distribution of reactive power.Voltage unbalance can also be compensated, and dynamic property is good
It is good, illustrate the correctness and validity of this method.
Description of the drawings
Fig. 1 linear quadratic control architectures.
The unsmooth collocation structure figure of Fig. 2 micro-capacitance sensor voltages.
Fig. 3 linear quadratic control principles.
Fig. 4 locals control structure.
Specific embodiment
In Fig. 1, micro-grid system is divided into three layers according to function：Key-course, linear quadratic control layer and three secondary controls
Layer.One secondary control is limited primarily to the local control of DG, and system variable can be made to track its setting value with most fast response speed；
And linear quadratic control and three secondary controls are usually to carry out system by various measurement amounts of the micro-capacitance sensor central controller in micro-capacitance sensor
Centralized Control can be carried out to all DG by adjusting linear quadratic controls layer；Linear quadratic control passes through tune after primary control reaches and stablizes
The setting value of whole DG is modified the voltage under long period scale and frequency shift (FS).Three secondary controls are mainly according to economy
It runs and is adjusted with the needs of Major Networks, therefore micro-capacitance sensor accesses distribution under three secondary control collective effects to it
Net, islet operation and between the two seamless have taken over seamlessly good control effect.
In Fig. 2, secondary controller is by low bandwidth communication networks by the control signal of PCC points（Voltage unbalance compensation system
Number）Local controller is sent to, is controlled as Voltage Reference so that PCC points voltage reaches setting value in microgrid.
In Fig. 3, in order to reduce communication bandwidth, ensure communication reliability, degree of unbalancedness is calculated using based on dq coordinates.It utilizes
Phaselocked loop（phase-locked loop,PLL）Voltage angular frequency is obtained, utilizes low-pass filtering（low-pass filters,
LPFs）Extract the positive and negative sequence voltage of PCC points.V+ and V- is respectively the positive sequence and negative sequence component of DG inverter output voltages
Virtual value, the VUF of gained, by PI controllers, are finally obtained by making comparisons with setting value。
In Fig. 4, under two-phase rest frame, positive-negative sequence separation is carried out using second order Generalized Product point-score, it is defeated to obtain DG
The positive and negative sequence voltage current component of outlet, and then required positive sequence active and reactive power is obtained, and pass through droop control and ginseng
It examines and module acquisition sinusoidal voltage reference signal occurs.Due to PCC point Voltage unbalances, analysis benefit is carried out by linear quadratic control
It repays, generated voltage compensation coefficient compensates sinusoidal voltage reference signal, and combines the virtual pressure that virtual impedance generates
Drop, obtains canonical reference voltage, as standard input voltage through overvoltage, double current loop modulation, obtains pulse signal and then control
Inverter processed.Improved PQ droop control methods change output angular frequency by adjusting active power, and then realize electricity
Press the control of phase angle difference；The control of voltage magnitude is realized by adjusting reactive power.Meanwhile with negative impedance, utilize former electricity
Pressure subtracts inverter output current in the ohmically pressure drop of virtual negative as final voltage, reaches with the virtual negative electricity of algorithm simulation
The purpose of resistance effect；A part of line resistance is offset with virtual negative resistance, so as under same effect, reduce virtual impedance
Value improves quality of voltage.When forward-order current is by virtual negative impedance, negative phase-sequence electricity caused by being exported due to DG is avoided
Pressure is uneven, compensate for line impedance cause not of uniform size and caused by idle output unevenness and virtual negative impedance there is no power
Loss, will not reduce efficiency.Input letter can not only be realized by obtaining this method using the positive sequence partition method of Second Order Generalized Integrator
Number positive-negative sequence separation, higher hamonic wave can also be filtered out.
Because it is AC compounent based on the voltage and current under rest frame, with quasi- ratio resonance PR
（proportional resonant）Controller is to carry out voltage, current error signal controls to make system by PR controllers
Zero steady-state error is realized at resonant frequency
Finally, obtained three-phase fundamental current and the three-phase filter inductance current subtraction detected are obtained into current error, by it
It is sent into current inner loop to be controlled, with reference to DC voltage, under the adjusting of space vector SVPWM controls, obtains inverter and open
Drive signal is closed, so that inverter under voltage, double current loop modulation, exports specified sine voltage.
Claims (5)
1. a kind of Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor, it is characterised in that：Including secondary controller, improve V/
F controls, virtual impedance ring, voltage and current ring control four parts.
2. the Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor as described in claim 1, it is characterised in that described secondary
Controller includes positive-negative sequence extraction and unbalance factor calculates two parts.
3. the Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor as described in claim 1, it is characterised in that the improvement
V/f is controlled, and is changed output angular frequency by adjusting active power, and then is realized the control of phase difference of voltage.
4. the Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor as described in claim 1, it is characterised in that described virtual
Impedance ring can offset a part of line resistance, so as under same effect, reduce the value of virtual impedance, improve voltage matter
Amount.
5. the Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor as described in claim 1, it is characterised in that the voltage
Current loop control is controlled using quasi- ratio resonance PR, is modulated by SVPWM, controls the value of voltage and current, realizes zero steady-state error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074223.8A CN108123462A (en) | 2016-11-29 | 2016-11-29 | A kind of Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074223.8A CN108123462A (en) | 2016-11-29 | 2016-11-29 | A kind of Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108123462A true CN108123462A (en) | 2018-06-05 |
Family
ID=62225703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611074223.8A Pending CN108123462A (en) | 2016-11-29 | 2016-11-29 | A kind of Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108123462A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109524977A (en) * | 2019-01-02 | 2019-03-26 | 兰州理工大学 | It is suitable for the synthesis suppressing method of the inside and outside three-phase imbalance disturbance of micro-capacitance sensor group |
| CN110071514A (en) * | 2019-05-14 | 2019-07-30 | 电子科技大学 | A kind of consistency droop control method restored for power distribution and electric voltage frequency |
| US11374411B2 (en) * | 2017-10-24 | 2022-06-28 | Nr Electric Co., Ltd | Converter control method and device |
-
2016
- 2016-11-29 CN CN201611074223.8A patent/CN108123462A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11374411B2 (en) * | 2017-10-24 | 2022-06-28 | Nr Electric Co., Ltd | Converter control method and device |
| CN109524977A (en) * | 2019-01-02 | 2019-03-26 | 兰州理工大学 | It is suitable for the synthesis suppressing method of the inside and outside three-phase imbalance disturbance of micro-capacitance sensor group |
| CN110071514A (en) * | 2019-05-14 | 2019-07-30 | 电子科技大学 | A kind of consistency droop control method restored for power distribution and electric voltage frequency |
| CN110071514B (en) * | 2019-05-14 | 2022-11-29 | 电子科技大学 | Consistency droop control method for power distribution and voltage frequency recovery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106451466B (en) | Grid power quality control system and method based on Research on Unified Power Quality Conditioner | |
| CN104836258B (en) | Microgrid control method having functions of voltage unbalance compensation and harmonic suppression | |
| CN103227581B (en) | Inverter parallel harmonic wave ring current restraining method for controlling harmonic wave droop | |
| CN102570476B (en) | Repetitive-control-based method for controlling compensation current of DSTATCOM (Distribution Static Synchronous Compensator) | |
| Kesler et al. | A novel control method for unified power quality conditioner (UPQC) under non-ideal mains voltage and unbalanced load conditions | |
| CN107257136B (en) | Grid-connected converter exports phase-locked loop systems and control method | |
| CN104836235B (en) | A kind of micro-capacitance sensor multi-inverter parallel progress control method using generatrix voltage compensation | |
| CN106849135B (en) | The power/current quality Synergistic method of microgrid inverter and active filter | |
| Guerrero et al. | Decentralized control for parallel operation of distributed generation inverters in microgrids using resistive output impedance | |
| Pouresmaeil et al. | Instantaneous active and reactive current control technique of shunt active power filter based on the three‐level NPC inverter | |
| CN109193680A (en) | A kind of isolated island micro-capacitance sensor delay based on consistency algorithm is immune without distribution of work control method | |
| Sahoo et al. | Integration of wind power generation through an enhanced instantaneous power theory | |
| CN106410858A (en) | Software digital phase-locking method based on dual dq coordination conversion | |
| CN106532749A (en) | Unbalanced power and harmonic voltage compensation system for micro-grid and application of system | |
| CN108879775A (en) | A kind of unbalanced power supply photovoltaic DC-to-AC converter control method for coordinating considering current limit | |
| CN108123462A (en) | A kind of Voltage unbalance linear quadratic control method of isolated island micro-capacitance sensor | |
| CN105337281A (en) | DC side capacitance voltage control method for star-shaped chained active power filter | |
| CN110266044A (en) | A kind of micro-grid connection control system and method based on energy accumulation current converter | |
| CN102623996B (en) | Active power filter closed loop control method based on decoupling resonance regulator array | |
| Yang et al. | Mitigation of background harmonics effect on MMC controller based on a novel coordinate transformation technique | |
| Jiapei et al. | A Control Strategy for Single-phase Grid-Connected Inverter with Power Quality Regulatory Function | |
| Mikkili et al. | Simulation and RTDS Hardware implementation of SHAF for Mitigation of Current Harmonics with pq and Id-Iq Control strategies using PI controller | |
| CN104506046A (en) | Uniform control method used for generating testing voltages of distributed generation grid-connected inverter | |
| Kabra et al. | Power quality improvement and analysis of interconnected bus system with PMU using VSM-STATCOM | |
| CN109066712A (en) | A kind of individual-phase control method and system of the parallel three level SVG of three-phase and four-line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180605 |
|
| WD01 | Invention patent application deemed withdrawn after publication |