CN106300431A - A kind of microgrid power droop control method - Google Patents
A kind of microgrid power droop control method Download PDFInfo
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- CN106300431A CN106300431A CN201610971641.0A CN201610971641A CN106300431A CN 106300431 A CN106300431 A CN 106300431A CN 201610971641 A CN201610971641 A CN 201610971641A CN 106300431 A CN106300431 A CN 106300431A
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- power
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- voltage
- droop control
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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
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a kind of microgrid power droop control method, build P ω and Q 0 droop control device and three-phase grid-connected inverter system；Gather three-phase voltage and the three-phase current instantaneous value of inverter output, be transformed to DC quantity by dq, obtain real-time active power and reactive power value through power calculation；Given meritorious and reactive power reference qref in droop control device, wherein reactive power reference qref is 0, is calculated amplitude and the angle values of reference voltage；Reference voltage and virtual voltage are made difference and obtains error voltage value, as current signal reference value after pi regulator exports, then obtain error current value with actual current work difference, and be input in pi regulator；The modulated signal exported by actuator generates pwm pulse ripple through SVPWM modulation, makes three-phase grid-connected inverting system generate electricity by way of merging two or more grid systems.The present invention solves reactive power uncontrollable problem when tradition droop control is incorporated into the power networks, and there is not the coupling of active power and reactive power, it is achieved that power factor exports.
Description
Technical field
The present invention relates to power grid control field, especially a kind of microgrid power droop control method.
Background technology
Along with the development of intelligent grid, the microgrid being made up of distributed power source is increasingly by Chinese scholars
Pay close attention to.The operational mode of microgrid is broadly divided into grid-connected and two kinds of isolated island, it is achieved grid-connected/isolated island is dual mode operated is really to embody it
The key link of motility, it runs control and has higher challenge.Micro-grid operational control method is broadly divided into three classes, main
Control and hierarchical control from control, equity.Droop control belongs to equity control method, and it is not changing the existing control of system and guarantor
In the case of protecting strategy, distributed power source can be accessed microgrid at any time, it is achieved " plug and play ", therefore the sagging control of the many employings of micro-capacitance sensor
Method processed.
For line impedance mainly in the grid-connected inverters system of perception, when there is islet operation in traditional droop control without
Merit power can not accurately control, and causes reactive power to be in uncontrollable state when being incorporated into the power networks.
Summary of the invention
Present invention aim at the micro-capacitance sensor a kind of accurate control reactive power being provided, voltage magnitude effectively being regulated
Power droop control method.
For achieving the above object, have employed techniques below scheme, the method for the invention comprises the following steps:
Step 1, builds P-ω and Q-0 droop control device and three-phase grid-connected inverter system；
Step 2, gathers three-phase voltage and the three-phase current instantaneous value of three-phase grid-connected inverter output, by dq conversion conversion
For DC quantity, obtain real-time active power and reactive power value through power calculation；
Step 3, given meritorious and reactive power reference qref in droop control device, wherein reactive power reference qref is 0.Will
Actual active power and the difference with reference to active power are multiplied by sagging coefficient, then obtain frequency values with rated frequency work difference, will be real
Border reactive power regulates through proportional integral (PI) actuator with the difference with reference to reactive power, then makees poor ginseng with rated voltage
Examine magnitude of voltage；
Step 4, reference voltage obtains error voltage value with virtual voltage work difference, and error voltage value is after pi regulator exports
As current signal reference value, current signal reference value is made difference with actual current again and is obtained error current value, and error current value is defeated
Entering in pi regulator, pi regulator is output as modulated signal
Step 5, the modulated signal exported by pi regulator generates pwm pulse ripple through SVPWM modulation, thus controls three-phase
Turning on and off of full-bridge inverter power tube, makes three-phase grid-connected inverting system generate electricity by way of merging two or more grid systems.
Further, the algorithm building P-ω and Q-0 droop control device in described step 1 is as follows:
Active power formula is ω=ω0-kp(P-P0) (1)；
Reactive power formula is U=U0-GPI(Q-Q0) (2)；
In formula, U and ω is respectively inverter output voltage amplitude and frequency；P and Q is respectively active power of output and idle
Power；U0And ω0It is respectively rated voltage amplitude and frequency；P0And Q0It is respectively specified active power and reactive power；kpFor having
The sagging coefficient of merit power；GPIFor the pi regulator transmission function introduced；
Further, sagging for the reactive power in Traditional control strategy coefficient part is revised as a PI by the inventive method
Actuator, when being incorporated into the power networks, amended reactive power tightly follows given reference power value, and being accurately controlled is 0, i.e. inversion
Device not output reactive power.
Compared with prior art, present invention have the advantage that
1, active power still uses the sagging mode of class electromotor be controlled and do not affected by line impedance, remains
The advantage of original control algolithm；
2, reactive power is precisely controlled to 0, can complete the regulation to voltage magnitude simultaneously；
3, there is not the coupling of active power and reactive power in this control algolithm, it is achieved that power factor exports；
4, this control algolithm is capable of independence and grid connected dual mode controls, it is only necessary to add presynchronization link, letter
Change the complexity of system different mode algorithms of different.
Accompanying drawing explanation
Fig. 1 is three-phase grid-connected inverter control structure figure in the present invention.
Fig. 2 is based on Q=0 Reactive Power Control structure chart in the present invention.
Grid-connected inverters output oscillogram when Fig. 3 is that under Traditional control strategy, load is different.
Grid-connected inverters output oscillogram when Fig. 4 is that under control strategy of the present invention, load is different.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings:
In the structure diagram of the present invention as shown in Figure 1, the method for the invention comprises the following steps:
Step 1, builds P-ω and Q-0 droop control device and three-phase grid-connected inverter system, as it is shown in figure 1, inverter is defeated
Go out voltage and current and drawn average meritorious and reactive power by power calculation link after measuring and gathering, obtain through droop control link
To exporting corresponding output voltage frequency and amplitude command value, obtain reference voltage through voltage synthesis link, finally by voltage electricity
Stream double-closed-loop control produces control signal.For making output impedance present perception, increase virtual impedance link.
The algorithm building P-ω and Q-0 droop control device is as follows:
Active power formula is ω=ω0-kp(P-P0) (1)；
Reactive power formula is U=U0-GPI(Q-Q0) (2)；
In formula, U and ω is respectively inverter output voltage amplitude and frequency；P and Q is respectively active power of output and idle
Power；U0And ω0It is respectively rated voltage amplitude and frequency；P0And Q0It is respectively specified active power and reactive power；kpFor having
The sagging coefficient of merit power；GPIFor the pi regulator transmission function introduced；
Step 2, gathers three-phase voltage and the three-phase current instantaneous value of three-phase grid-connected inverter output, by dq conversion conversion
For DC quantity, obtain real-time active power and reactive power value through power calculation；
Step 3, given meritorious and reactive power reference qref in droop control device, wherein reactive power reference qref is 0.Will
Actual active power and the difference with reference to active power are multiplied by sagging coefficient, then obtain frequency values with rated frequency work difference, will be real
Border reactive power regulates through pi regulator with the difference with reference to reactive power, then obtains reference voltage level with rated voltage work difference,
As shown in Figure 2；
Step 4, makees difference by reference voltage and virtual voltage and obtains error voltage value, and error voltage value exports through pi regulator
Afterwards as current signal reference value, current signal reference value is made difference with actual current again and is obtained error current value, error current value
Being input in pi regulator, pi regulator is output as modulated signal；
Step 5, the modulated signal exported by pi regulator generates pwm pulse ripple through SVPWM modulation, thus controls three-phase
Turning on and off of full-bridge inverter power tube, makes three-phase grid-connected inverting system generate electricity by way of merging two or more grid systems.
Sagging for reactive power in Traditional control strategy coefficient part is revised as a pi regulator by inventive algorithm, and
During network operation, amended reactive power tightly follows given reference power value, and being accurately controlled is 0, i.e. inverter does not exports
Reactive power.
Embodiment 1: combining inverter DC voltage 700V；Electrical network phase voltage peak value is 311V；Droop control device is specified
Active power is 2kW, and rated reactive power is 0；Load active power is 3kW, and reactive power takes 0 respectively, 1kVar tests
Card.Simulation result is as shown in Figure 3,4.Fig. 3 a is oscillogram during local load reactive power Q=0 under Traditional control strategy, figure
3b is oscillogram during local load reactive power Q=1000var under Traditional control strategy.Fig. 4 a is under control strategy of the present invention
Oscillogram during local load reactive power Q=0, Fig. 4 b be local load reactive power Q under control strategy of the present invention=
Oscillogram during 1000var.Comparison diagram 3 and Fig. 4 is it can be seen that use Traditional control strategy active power to be controlled in specified
Value, and reactive power is in uncontrollable state.Reactive power can accurately be controlled to be 0 by the control strategy using the present invention to propose,
Eliminate the coupling of active power and reactive power, it is achieved that power factor exports simultaneously.
Embodiment described above is only to be described the preferred embodiment of the present invention, the not model to the present invention
Enclose and be defined, on the premise of designing spirit without departing from the present invention, the those of ordinary skill in the art technical side to the present invention
Various deformation that case is made and improvement, all should fall in the protection domain that claims of the present invention determines.
Claims (3)
1. a microgrid power droop control method, it is characterised in that said method comprising the steps of:
Step 1, builds P-ω and Q-0 droop control device and three-phase grid-connected inverter system；
Step 2, gathers three-phase voltage and the three-phase current instantaneous value of three-phase grid-connected inverter output, is converted to straight by dq conversion
Flow, obtains real-time active power and reactive power value through power calculation；
Step 3, given meritorious and reactive power reference qref in droop control device, wherein reactive power reference qref is 0, by reality
Active power and the difference with reference to active power are multiplied by sagging coefficient, then obtain frequency values, by actual nothing with rated frequency work difference
Merit power regulates through proportional integral (PI) actuator with the difference with reference to reactive power, then makees poor obtaining with reference to electricity with rated voltage
Pressure value；
Step 4, makees difference by reference voltage and virtual voltage and obtains error voltage value, and error voltage value is made after pi regulator exports
For current signal reference value, current signal reference value is made difference again and is obtained error current value, the input of error current value with actual current
In proportional and integral controller (PI), pi regulator is output as modulated signal；
Step 5, the modulated signal exported by pi regulator generates pwm pulse ripple through SVPWM modulation, thus controls three phase full bridge
Turning on and off of inverter power pipe, makes three-phase grid-connected inverting system generate electricity by way of merging two or more grid systems.
A kind of microgrid power droop control method the most according to claim 1, it is characterised in that structure in described step 1
The algorithm building P-ω and Q-0 droop control device is as follows:
Active power formula is ω=ω0-kp(P-P0) (1)；
Reactive power formula is U=U0-GPI(Q-Q0) (2)；
In formula, U and ω is respectively inverter output voltage amplitude and frequency；P and Q is respectively active power of output and idle merit
Rate；U0And ω0It is respectively rated voltage amplitude and frequency；P0And Q0It is respectively specified active power and reactive power；kpIt is meritorious
The sagging coefficient of power；GPIFor the pi regulator transmission function introduced.
A kind of microgrid power droop control method the most according to claim 1, it is characterised in that: by Traditional control strategy
In the sagging coefficient part of reactive power be revised as a pi regulator, when being incorporated into the power networks, amended reactive power tightly with
With given reference power value, accurately controlling is 0, i.e. inverter not output reactive power.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591837A (en) * | 2017-09-06 | 2018-01-16 | 南京理工大学 | A kind of method that electric power spring based on droop control participates in micro-capacitance sensor stability contorting |
| CN107800318A (en) * | 2017-08-03 | 2018-03-13 | 中南大学 | A kind of control method of grid-connected inverter and system |
| CN108075487A (en) * | 2017-12-05 | 2018-05-25 | 燕山大学 | The hierarchical control method for the isolated island micro-capacitance sensor that adaptive sagging and uniformity is combined |
| CN110148966A (en) * | 2019-05-28 | 2019-08-20 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Based on twin inverter in parallel and off-network control method and device |
| CN110460112A (en) * | 2019-09-18 | 2019-11-15 | 东北大学 | A kind of micro-capacitance sensor droop control method based on the control of power deviation amount consistency |
| CN110690727A (en) * | 2019-09-20 | 2020-01-14 | 天津大学 | Cascading H-bridge converter flexible grid-connection method based on hierarchical voltage control |
| CN111224416A (en) * | 2020-02-19 | 2020-06-02 | 燕山大学 | SOC (System on chip) balance-based parallel control method and system for cascaded energy storage converters |
| CN111313474A (en) * | 2020-04-01 | 2020-06-19 | 西华大学 | Improved micro-grid-connected presynchronization control method |
| CN111555343A (en) * | 2020-05-07 | 2020-08-18 | 中南大学 | General distributed control method and system for cascade inverter |
| CN112531776A (en) * | 2020-12-04 | 2021-03-19 | 国网河南省电力公司洛阳供电公司 | Droop control method for new energy station |
| CN112688362A (en) * | 2020-12-17 | 2021-04-20 | 哈尔滨理工大学 | Inverter parallel control system and control method based on improved droop control |
| CN113241802A (en) * | 2021-05-14 | 2021-08-10 | 山东大学 | Microgrid grid-connected point voltage control system and method based on power cooperative regulation |
| CN113629783A (en) * | 2021-07-20 | 2021-11-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Adaptive inertia droop control method with power feedback |
| CN114204644A (en) * | 2021-12-16 | 2022-03-18 | 国网湖南省电力有限公司 | Charging and discharging control method and system for energy storage system of electric automobile and storage medium |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800318B (en) * | 2017-08-03 | 2020-11-10 | 中南大学 | Grid-connected inverter control method and system |
| CN107800318A (en) * | 2017-08-03 | 2018-03-13 | 中南大学 | A kind of control method of grid-connected inverter and system |
| CN107591837A (en) * | 2017-09-06 | 2018-01-16 | 南京理工大学 | A kind of method that electric power spring based on droop control participates in micro-capacitance sensor stability contorting |
| CN108075487A (en) * | 2017-12-05 | 2018-05-25 | 燕山大学 | The hierarchical control method for the isolated island micro-capacitance sensor that adaptive sagging and uniformity is combined |
| CN108075487B (en) * | 2017-12-05 | 2021-03-19 | 燕山大学 | Hierarchical control method for island micro-grid with combination of self-adaptive droop and consistency |
| CN110148966A (en) * | 2019-05-28 | 2019-08-20 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Based on twin inverter in parallel and off-network control method and device |
| CN110148966B (en) * | 2019-05-28 | 2023-04-28 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Parallel double-inverter-based parallel/off-grid control method and device |
| CN110460112A (en) * | 2019-09-18 | 2019-11-15 | 东北大学 | A kind of micro-capacitance sensor droop control method based on the control of power deviation amount consistency |
| CN110460112B (en) * | 2019-09-18 | 2023-02-28 | 东北大学 | Micro-grid sag control method based on power deviation value consistency control |
| CN110690727A (en) * | 2019-09-20 | 2020-01-14 | 天津大学 | Cascading H-bridge converter flexible grid-connection method based on hierarchical voltage control |
| CN111224416A (en) * | 2020-02-19 | 2020-06-02 | 燕山大学 | SOC (System on chip) balance-based parallel control method and system for cascaded energy storage converters |
| CN111224416B (en) * | 2020-02-19 | 2023-12-29 | 燕山大学 | Cascaded energy storage converter parallel control method and system based on SOC balance |
| CN111313474A (en) * | 2020-04-01 | 2020-06-19 | 西华大学 | Improved micro-grid-connected presynchronization control method |
| CN111555343A (en) * | 2020-05-07 | 2020-08-18 | 中南大学 | General distributed control method and system for cascade inverter |
| CN111555343B (en) * | 2020-05-07 | 2023-06-27 | 中南大学 | Universal distributed control method and system for cascading inverter |
| CN112531776A (en) * | 2020-12-04 | 2021-03-19 | 国网河南省电力公司洛阳供电公司 | Droop control method for new energy station |
| CN112688362A (en) * | 2020-12-17 | 2021-04-20 | 哈尔滨理工大学 | Inverter parallel control system and control method based on improved droop control |
| CN113241802A (en) * | 2021-05-14 | 2021-08-10 | 山东大学 | Microgrid grid-connected point voltage control system and method based on power cooperative regulation |
| CN113241802B (en) * | 2021-05-14 | 2022-08-05 | 山东大学 | Microgrid grid-connected point voltage control system and method based on power cooperative regulation |
| CN113629783A (en) * | 2021-07-20 | 2021-11-09 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Adaptive inertia droop control method with power feedback |
| CN114204644A (en) * | 2021-12-16 | 2022-03-18 | 国网湖南省电力有限公司 | Charging and discharging control method and system for energy storage system of electric automobile and storage medium |
| CN114204644B (en) * | 2021-12-16 | 2023-11-07 | 国网湖南省电力有限公司 | Charging and discharging control method, system and storage medium for energy storage system of electric automobile |
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Application publication date: 20170104 |