CN108123464A - A kind of microgrid of energy-storage system takes over seamlessly control method - Google Patents
A kind of microgrid of energy-storage system takes over seamlessly control method Download PDFInfo
- Publication number
- CN108123464A CN108123464A CN201611074114.6A CN201611074114A CN108123464A CN 108123464 A CN108123464 A CN 108123464A CN 201611074114 A CN201611074114 A CN 201611074114A CN 108123464 A CN108123464 A CN 108123464A
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- CN
- China
- Prior art keywords
- microgrid
- energy
- storage system
- smooth
- saturation
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of microgrid smooth-switching methods of energy-storage system, including gird-connected inverter, droop control, take over seamlessly, four parts of anti-saturation proportional and integral controller.By using the control strategy of phaselocked loop under anti-saturation integrator, droop control and the double synchronous coordinate systems of decoupling, it can realize that microgrid takes over seamlessly.Meanwhile, it is capable to effectively inhibit to improve system reliability and stability to isolated island, isolated island to the electric current and voltge surge during grid-connected switching grid-connected.Meanwhile based on the phaselocked loop of double synchronous rotating frames, voltage positive-sequence component and phase information can be rapidly and accurately extracted, improves the rapidity and accuracy of system.
Description
Technical field
The present invention relates to the microgrid sides of taking over seamlessly of a kind of microgrid smooth-switching method more particularly to a kind of energy-storage system
Method.
Background technology
The problems such as due to energy crisis and environmental pollution getting worse, based on the distributed generation system of regenerative resource into
Effective ways in order to solve the above problem.Distributed generation unit output power usually has the characteristics that intermittent and randomness,
Such as wind-powered electricity generation and photovoltaic, therefore it is a kind of more efficient that renewable distributed generation unit is accessed major network in the form of micro-capacitance sensor
Measure.
Micro-capacitance sensor is usually made of distributed generation unit, energy-storage units, load and grid-connected interface converter.Micro-capacitance sensor
Both grid-connect mode can be operated in, island mode can also be operated in.During grid-connect mode, distributed generation resource inside micro-capacitance sensor
Output power is mainly used for local load consumption, and when distributed power source output power is more than local load, superfluous power passes
It is defeated by power grid；When distributed power source output power is less than local load, insufficient power is provided by power grid.In electric network fault or
During person plans isolated island, energy-storage units are switched to droop control as main control unit under normal conditions or VF controls ensure exchange
Busbar voltage and frequency stabilization so as to important load uninterrupted power supply.
During normal operation, grid-connect mode and island mode usually require to take over seamlessly micro-capacitance sensor, however tradition switching
Method will cause overcurrent or overvoltage phenomenon, and not only power grid can be caused to impact, but also can damage load, therefore micro- electricity
It is one of key technology of guarantee system safe and reliable operation to net grid-connected/isolated island and take over seamlessly.
The content of the invention
Caused overcurrent or overvoltage are excessive during in order to overcome the problems, such as micro-capacitance sensor pattern switching, and the present invention proposes a kind of
The microgrid smooth-switching method of energy-storage system.
The technical solution adopted by the present invention to solve the technical problems is：
The present invention uses the phaselocked loop based on double synchronous rotating frames, can rapidly and accurately extract voltage positive-sequence component and phase
Position information, at the same time in order to realize presynchronization control, electric network voltage phase and amplitude difference are added to by PI adjusters
Traditional droop control device.In addition additionally use anti-saturation pi controller and inhibit adjuster saturation.Energy-storage system
Microgrid smooth-switching method including gird-connected inverter, droop control, takes over seamlessly, four portions of anti-saturation proportional and integral controller
Point.
The gird-connected inverter forms bridge circuit by 6 insulated gate bipolar IGBT, and DC side stores for micro-grid connection
Battery.
The droop control uses Three-loop control mode, and combines decoupling and feedforward control, modulates to obtain by SPWM
Gird-connected inverter driving pulse.
The method taken over seamlessly using phaselocked loop under decoupling dual rotary coordinate system, effectively extracts electric network voltage phase letter
Breath.
The anti-saturation proportional and integral controller can effectively by pi regulator cause output gradually increases, when the time compared with
When long, the phenomenon that adjuster saturation.
The beneficial effects of the invention are as follows：By using anti-saturation integrator, droop control and the double synchronous coordinate systems of decoupling
The control strategy of lower phaselocked loop can realize that microgrid takes over seamlessly.Meanwhile, it is capable to effectively inhibit to arrive to isolated island, isolated island grid-connected
Electric current and voltge surge during grid-connected switching improve system reliability and stability.Meanwhile based on double synchronous rotating frames
Phaselocked loop, can rapidly and accurately extract voltage positive-sequence component and phase information, improve the rapidity and accuracy of system.
Description of the drawings
Fig. 1 gird-connected inverter structures.
Fig. 2 droop control structures.
Fig. 3 anti-saturation proportional and integral controllers.
Specific embodiment
As shown in Figure 1, S1, S2, S3, S4, S5, S6 are six insulated gate bipolar IGBT, L, R for line equivalent resistance and
Inductance.
Micro-capacitance sensor can be operated in grid-connected and island mode, and the control model of gird-connected inverter is not in different patterns
With.During being incorporated into the power networks, since the clamping action of network voltage causes PCC voltage magnitudes and frequency to keep substantially not
Become, therefore the output power of inverter can be controlled by controlling electric current, inverter can be looked at as 1 controllably at this time
Current source.When abnormal or planned isolated island occurs in power grid, micro-capacitance sensor may operate in island mode, due to losing bulk power grid
Clamping action, PCC voltage magnitudes and frequency need energy-storage system to be supported and then ensure that PCC voltages are allowing to run model
In enclosing, gird-connected inverter is considered as controllable voltage source at this time.
First according to formula（3）And formula（4）Current reference value is obtained, according to voltage and frequency synthesis three-phase voltage reference value,
It converts to obtain d axis and q shaft voltage reference values using park, voltage reference value and actual value is subtracted each other by PI adjusters
It can obtain current inner loop command value.Current reference value and value of feedback are subtracted each other and obtain modulated signal by PI adjusters, similarly
With reference to decoupling and feedforward control, gird-connected inverter driving pulse is obtained eventually by SPWM modulation strategies.
During being incorporated into the power networks, gird-connected inverter is usually operated at current source mode, and during isolated island, it is operated in voltage
Source module, therefore two kinds of operating modes will switch.Switching electric current inner ring reference value is needed in handoff procedure, except this it
External grid-connected period generally use phaselocked loop extraction electric network voltage phase, and during island mode, network voltage loses, at this time
Phase information will also switch over.
As shown in figure 3, can usually be influenced during operation of power networks by various extraneous factors, most common is exactly short-circuit event
Barrier, wherein single-phase grounding fault probability of happening are maximum.When single-phase earthing fault occurs, there are negative sequence components for network voltage
It will cause Voltage unbalance, at this time using phaselocked loop under double synchronous rotating frames.This method by network voltage positive sequence and
Negative sequence component carries out decoupling extraction, and positive-sequence component is controlled and then obtains phase information, will not be subject to the shadow of negative sequence component
It rings, accuracy higher.
Claims (5)
1. a kind of microgrid smooth-switching method of energy-storage system, it is characterised in that：Including gird-connected inverter, droop control, smooth
Four switching, anti-saturation proportional and integral controller parts.
A kind of 2. microgrid smooth-switching method of energy-storage system as described in claim 1, it is characterised in that the parallel network reverse
Device forms bridge circuit by 6 insulated gate bipolar IGBT, and DC side is micro-grid connection accumulator.
A kind of 3. microgrid smooth-switching method of energy-storage system as described in claim 1, it is characterised in that the droop control
Using Three-loop control mode, and decoupling and feedforward control are combined, modulate to obtain gird-connected inverter driving pulse by SPWM.
4. the microgrid smooth-switching method of a kind of energy-storage system as described in claim 1, it is characterised in that described to take over seamlessly
Using the method for phaselocked loop under decoupling dual rotary coordinate system, electric network voltage phase information is effectively extracted.
A kind of 5. microgrid smooth-switching method of energy-storage system as described in claim 1, it is characterised in that the anti-saturation ratio
Example integral controller effectively can cause output to gradually increase by pi regulator, and when the time is longer, adjuster saturation shows
As.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074114.6A CN108123464A (en) | 2016-11-29 | 2016-11-29 | A kind of microgrid of energy-storage system takes over seamlessly control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074114.6A CN108123464A (en) | 2016-11-29 | 2016-11-29 | A kind of microgrid of energy-storage system takes over seamlessly control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108123464A true CN108123464A (en) | 2018-06-05 |
Family
ID=62226743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611074114.6A Pending CN108123464A (en) | 2016-11-29 | 2016-11-29 | A kind of microgrid of energy-storage system takes over seamlessly control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108123464A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631299A (en) * | 2018-04-18 | 2018-10-09 | 哈尔滨理工大学 | The grid-connected island mode switching method of magneto alternator micro-grid system |
| CN110209049A (en) * | 2019-05-22 | 2019-09-06 | 中国科学院光电技术研究所 | A kind of narrowband amplitude Disturbance Rejection method based on inertance loop |
| CN111049181A (en) * | 2019-12-19 | 2020-04-21 | 国网湖南省电力有限公司 | Micro-grid connection method, device and system based on joint control |
-
2016
- 2016-11-29 CN CN201611074114.6A patent/CN108123464A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631299A (en) * | 2018-04-18 | 2018-10-09 | 哈尔滨理工大学 | The grid-connected island mode switching method of magneto alternator micro-grid system |
| CN110209049A (en) * | 2019-05-22 | 2019-09-06 | 中国科学院光电技术研究所 | A kind of narrowband amplitude Disturbance Rejection method based on inertance loop |
| CN110209049B (en) * | 2019-05-22 | 2022-04-19 | 中国科学院光电技术研究所 | Narrow-band large-amplitude disturbance suppression method based on inertial loop |
| CN111049181A (en) * | 2019-12-19 | 2020-04-21 | 国网湖南省电力有限公司 | Micro-grid connection method, device and system based on joint control |
| CN111049181B (en) * | 2019-12-19 | 2021-04-27 | 国网湖南省电力有限公司 | Micro-grid connection method, device and system based on joint control |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180605 |
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| WD01 | Invention patent application deemed withdrawn after publication |