CN106684926A - Pre-sync control method for DC/AC inverter in black start of hybrid microgrid - Google Patents
Pre-sync control method for DC/AC inverter in black start of hybrid microgrid Download PDFInfo
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- CN106684926A CN106684926A CN201710142264.4A CN201710142264A CN106684926A CN 106684926 A CN106684926 A CN 106684926A CN 201710142264 A CN201710142264 A CN 201710142264A CN 106684926 A CN106684926 A CN 106684926A
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- phase angle
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- frequency
- control method
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02J3/381—Dispersed generators
Abstract
The invention discloses a pre-sync control method for a DC/AC inverter in the black start of a hybrid microgrid; method comprises: detecting busbar voltage and frequency, setting detected values as reference values for constant-voltage constant-frequency control method, enabling output voltage of the DC/AC inverter to be identical with the busbar voltage in amplitude and frequency, and enabling the inverter to output constant voltage under constant frequency through double closed loop control of a current control inner loop and a voltage control outer loop; using a phase-locked loop to detect the busbar voltage and the phase angle of output voltage of the inverter respectively, calculating to arrive at a phase angle difference, using the phase angle difference to calculate zero frequency time that is to be inserted for the output voltage to even up the phase angle difference, and setting V/f control reference frequency to zero so that the phase angle of the output voltage of the inverter is evened up. The pre-sync control method enables pre-sync control to be within several periods, pre-sync speed is increased, the black start time of the microgrid is shortened, and the loss due to microgrid faults is minimized.
Description
Technical field
The present invention relates to a kind of presynchronization control method of the DC/AC inverters of mixing micro-capacitance sensor black starting-up process.
Background technology
In recent years, because energy crisis is serious all the more, Power Electronic Technique, the application of distributed power source (DG) and development are standby
Attract attention.Mixing micro-capacitance sensor combines the advantage of alternating current-direct current micro-capacitance sensor both sides, and has used DG in a large number, in application efficiency and skill
For the angle of art practicality, its development has very wide prospect.But, due to DG and power electronics in mixing micro-capacitance sensor
Changer is used in a large number so that the stability of micro-capacitance sensor is reduced, and uncertainty increases, especially when micro-capacitance sensor because failure is caused
When blackout enters full black state, micro-capacitance sensor will be difficult to recover.Accordingly, it would be desirable to significantly more efficient micro-capacitance sensor Preservation tactics are to micro-
Electrical network is protected, particularly fast and effectively black starting-up Preservation tactics.When micro-capacitance sensor total collapse, during into full black state,
More efficient quick black starting-up strategy and control method become the key of black starting-up success.
In mixing micro-capacitance sensor exchange subnet serial startup scheme, black starting-up process includes that black starting-up main power source starts to mother
Line charges, the grid-connected and load of other non-black starting-up main power sources is accessed.Start success in main power source and set up stable bus electricity
Behind pressure ring border, DG output voltages and busbar voltage have differences in amplitude, frequency, phase angle and phase place.If in amplitude, frequency
Difference in rate, phase angle and phase place is excessive, beyond safety range, DG access buses is directly had the impact beyond safety range
Electric current is produced, and causes busbar voltage unbalance and DG access failures.
DG can not smoothly access bus, final to affect micro-capacitance sensor black starting-up process, or even black starting-up failure, so as to cause length
Time, on a large scale power supply failure, cause huge economic loss.Accordingly, it would be desirable to studying one kind fast and effectively mixes micro- electricity
The presynchronization control method of net black starting-up DC/AC inverters, controls other DG before bus is accessed, by inverter output voltage width
Value, frequency, phase angle are synchronized within the acceptable safety range of ac bus voltage, so as to steadily access.And it is as real as possible
Existing Fast synchronization, saves the black starting-up time, reduces the loss that micro-capacitance sensor hinders for some reason and causes.Therefore, fast and effectively micro-capacitance sensor
Success of the inverter presynchronization control method to micro-capacitance sensor black starting-up is most important.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that a kind of DC/AC inverters of mixing micro-capacitance sensor black starting-up process
Presynchronization control method, the present invention is on the basis of DC/AC inverters conventional constant voltage constant frequency (V/f) controls by adjusting voltage and frequency
Rate is given to realize presynchronization control.The present invention can shorten the presynchronization time, improve presynchronization precision.In this pre-synchronization method
Under control, inverter output voltage can reduce bus dash current with near-synchronous in busbar voltage during DG is grid-connected, real
It is now steady grid-connected, safely and fast complete black starting-up.
To achieve these goals, the present invention is adopted the following technical scheme that：
It is a kind of mixing micro-capacitance sensor black starting-up process DC/AC inverters presynchronization control method, detection busbar voltage and
Frequency, by detected value the reference value of constant voltage constant frequency control method is set as, make DC/AC inverter output voltages amplitude and frequency with
Busbar voltage is identical, and the double-closed-loop control for controlling outer shroud by current control internal ring, voltage realizes that inverter exports constant voltage constant frequency.
The phase angle of busbar voltage and inverter output voltage is detected respectively, by calculating phase angle difference, using phase angle difference
Calculate output voltage produce the equalizer phase angle difference need insert the zero-frequency time.
V/f controls reference frequency is set to into zero, the phase angle for realizing inverter output voltage is produced the equalizer.
The phase angle of busbar voltage and inverter output voltage is detected respectively using phaselocked loop.
Specifically include following steps：
(1) voltage and frequency of bus are detected, and as the reference electricity of DC/AC inverters constant voltage constant frequency control
Pressure, frequency；
(2) calculate the phase angle of bus and inverter output voltage, judge phase angle difference whether be directly accessed scope it
It is interior, distributed power source is directly accessed if within the scope of, calculate if beyond scope is directly accessed and produce the equalizer phase angle difference
Value needs the zero frequency time of insertion；
(4) after the grid-connected signal of distributed power source is obtained, frequency is given at the end of inverter output voltage a cycle
Zero is set to, the persistent period is the inserted zero frequency time；
(5) after the zero-frequency time terminates, reference frequency recovers line voltage frequency；
(6) calculate the phase angle of bus and inverter output voltage respectively again, judge phase angle difference whether can be direct
Within the scope of access, then distributed power source is directly accessed within the scope of.
In the step (1), black starting-up main power source to busbar charging, to set up stable bus environment, distributed power source
Unloaded tracking is completed, the voltage magnitude of inverter output, frequency are identical with busbar voltage.
In the step (2), the phase angle of busbar voltage and inverter output voltage is detected respectively using phaselocked loop.
In the step (2), the calculation of phase angle difference is distributed power source output voltage phase angle and busbar voltage phase angle
Difference.
In the step (2), if phase angle difference can be being maintained in the range of system stability, when receiving grid-connected signal
Direct grid-connected, control method is converted to power limitation control by constant voltage constant frequency control.
In the step (4), the computational methods of the zero frequency time period inserted are：
In formula θ be phase angle difference, θ1For DG output voltage phase angles, θ2For busbar voltage phase angle.
Compared with prior art, beneficial effects of the present invention are：
(1) this invention simplifies DG presynchronization processes.The presynchronization control method of insertion zero frequency time so that presynchronization
Algorithm is more easy to be controllable；
(2) presynchronization result of the present invention is more accurate.Compared to traditional presynchronization control method, by calculated
Cause to be produced the equalizer during presynchronization that phase angle is more accurate the zero frequency time, error is less；
(3) presynchronization control method of the invention, can accelerate pre- by presynchronization control control within several cycles
Synchronizing speed, reduces the time of micro-capacitance sensor black starting-up, will be reduced to minimum because of the loss that micro-capacitance sensor failure is caused.
Description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrated for explaining the application, does not constitute the improper restriction to the application.
Fig. 1 is mixing micro-capacitance sensor structure chart；
Fig. 2 is presynchronization control method structured flowchart of the present invention；
Fig. 3 is the given output flow chart of presynchronization of the present invention control frequency；
Fig. 4 (a) be phase angle difference be 60 ° when, using presynchronization control process DG single-phase output voltage of the present invention with exchange mother
Line voltage analogous diagram；
When Fig. 4 (b) is 60 ° for phase angle difference, using presynchronization control process DG three-phase output voltage analogous diagram of the present invention；
Fig. 5 (a) be phase angle difference be 90 ° when, using presynchronization control process DG single-phase output voltage of the present invention with exchange mother
Line voltage analogous diagram；
When Fig. 5 (b) is 90 ° for phase angle difference, using presynchronization control process DG three-phase output voltage analogous diagram of the present invention；
Fig. 6 (a) be phase angle difference be 180 ° when, using presynchronization control process DG single-phase output voltage of the present invention with exchange mother
Line voltage analogous diagram；
When Fig. 6 (b) is 180 ° for phase angle difference, using presynchronization control process DG three-phase output voltage analogous diagram of the present invention.
Specific embodiment：
Below in conjunction with the accompanying drawings the invention will be further described with embodiment.
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Mixing micro-capacitance sensor structure chart as shown in figure 1, switch when black starting-up starts it is all off, when black starting-up main power source
To busbar charging, and set up after stable bus environment, other DG are grid-connected.
Presynchronization control is divided into unloaded tracking and presynchronization in parallel.In unloaded tracing process, DC/AC inverters are controlled
Under V/f patterns, reference voltage and frequency are respectively busbar voltage and frequency.Realized by voltage and current double closed-loop PID control
Inverter exports constant voltage constant frequency, realizes that the amplitude and frequency of output voltage is identical with bus.
After grid-connected signal is connected to, inverter enters the presynchronization stage in parallel.Fig. 2 is other DG grid connection presynchronization controller chassises
Figure.Presynchronization module detects that inverter exports phase angle by PLL, is calculated by formula and produces the equalizer what is inserted required for phase angle difference
The zero frequency time, and export reference frequency.Its grid connection presynchronization is realized comprising the following steps that：
(1) black starting-up main power source sets up a stable bus environment to busbar charging.DG completes unloaded tracking, inversion
The voltage magnitude of device output, frequency are identical with busbar voltage；
(2) the output phase angle of bus and inverter is detected respectively by PLL, and calculates phase angle difference, phase angle difference calculates public
Formula is：
θ=θ1-θ2
θ is phase angle difference in formula；θ1For DG output voltage phase angles；θ2For busbar voltage phase angle；
(3) if phase angle difference can be being maintained in the range of system stability, direct grid-connected when receiving grid-connected signal, control
Method processed is converted to invariable power (P/Q) control by V/f controls；
(4) if phase angle difference is excessive, beyond the scope of safety grid-connection, presynchronization module is calculated to be produced the equalizer needed for phase angle difference
The zero frequency time to be inserted, and after a voltage cycle terminates, reference frequency is reduced to zero by moment, and the persistent period is to be counted
The zero-frequency time for calculating, terminate that rear frequency is given to return to bus frequency.The zero frequency time period inserted is Δ t computing formula
For：
(5) after phase angle is produced the equalizer, when grid-connected signal is received, DG is grid-connected, and inverter control method is converted to by V/f controls
P/Q is controlled.
Fig. 3 is presynchronization control module rate-adaptive pacemaker FB(flow block).
Through presynchronization module presynchronization control after, inverter output voltage in phase place, amplitude, frequency and phase angle all
It is approximately the same with busbar voltage, within the scope of its difference is all in safety grid-connection, it is possible to achieve safety grid-connection.
Simulation analysis：
Table 1：Simulation parameter
Simulation analysis：
Three-phase bridge PWM inverter is built in MATLAB/SIMULINK 2014a, and builds control system makes inverter
Under being operated in V/f controls.And add presynchronization module on this basis, controlled using the presynchronization control method of the present invention
System, it is 350V to give bus rated peak voltage, and busbar voltage phase angle is 0 °, in 0.1s, obtains grid-connected signal, and inverter is defeated
Go out and start to produce the equalizer phase angle, make phase angle difference be zero.
Simulation waveform Fig. 4 (a)-(b), Fig. 5 (a)-(b), Fig. 6 (a)-(b) are respectively when inverter output voltage and bus
Phase difference of voltage be 60 °, 90 °, when 180 °, the waveform of single-phase voltage and three-phase voltage during presynchronization.From simulation waveform
In it can be seen that using the presynchronization control method of the present invention, can be quickly produce the equalizer inverter output voltage and busbar voltage it
Between phase angle difference.As can be seen that being carried out after presynchronization control using the present invention from simulation waveform, waveform is not distorted,
Basic with busbar voltage is completely superposed, and has reached the Expected Results of presynchronization.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent, improvement etc., should be included within the protection domain of the application.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (10)
1. a kind of presynchronization control method of the DC/AC inverters of mixing micro-capacitance sensor black starting-up process, is characterized in that：Detection bus
Voltage and frequency, by detected value the reference value of constant voltage constant frequency control method is set as, make DC/AC inverter output voltages amplitude and
Frequency is identical with busbar voltage, and the double-closed-loop control for controlling outer shroud by current control internal ring, voltage realizes that inverter output is permanent
Pressure constant frequency.
2. the presynchronization control method of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 1,
It is characterized in that：The phase angle of busbar voltage and inverter output voltage is detected respectively, by calculating phase angle difference, using phase angle difference
Calculate output voltage produce the equalizer phase angle difference need insert the zero-frequency time.
3. the presynchronization control method of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 1,
It is characterized in that：V/f controls reference frequency is set to into zero, the phase angle for realizing inverter output voltage is produced the equalizer.
4. the presynchronization control method of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 1,
It is characterized in that：The phase angle of busbar voltage and inverter output voltage is detected respectively using phaselocked loop.
5. a kind of DC/AC inverters of the mixing micro-capacitance sensor black starting-up process as any one of claim 1-4 is pre- same
Step control method, is characterized in that：Specifically include following steps：
(1) voltage and frequency of bus are detected, and as reference voltage, the frequency of the control of DC/AC inverters constant voltage constant frequency
Rate；
(2) phase angle of bus and inverter output voltage is calculated, phase angle difference is judged whether within the scope of being directly accessed, such as
Then distributed power source is directly accessed within the scope of, calculated if beyond scope is directly accessed and is produced the equalizer phase angle difference needs
The zero frequency time of insertion；
(4) after the grid-connected signal of distributed power source is obtained, frequency is given at the end of inverter output voltage a cycle is set to
Zero, the persistent period is the inserted zero frequency time；
(5) after the zero-frequency time terminates, reference frequency recovers line voltage frequency；
(6) calculate the phase angle of bus and inverter output voltage respectively again, judge whether phase angle difference can be directly accessed
Within the scope of, then distributed power source is directly accessed within the scope of.
6. the presynchronization control method of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 5,
It is characterized in that：In the step (1), black starting-up main power source to busbar charging, to set up stable bus environment, distributed power source
Unloaded tracking is completed, the voltage magnitude of inverter output, frequency are identical with busbar voltage.
7. the presynchronization control method of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 5,
It is characterized in that：In the step (2), the phase angle of busbar voltage and inverter output voltage is detected respectively using phaselocked loop.
8. the presynchronization control method of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 5,
It is characterized in that：In the step (2), the calculation of phase angle difference is distributed power source output voltage phase angle and busbar voltage phase angle
Difference.
9. the presynchronization control method of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 5,
It is characterized in that：In the step (2), if phase angle difference can be being maintained in the range of system stability, grid-connected signal is received
When direct grid-connected, control method by constant voltage constant frequency control be converted to power limitation control.
10. the presynchronization controlling party of the DC/AC inverters of a kind of mixing micro-capacitance sensor black starting-up process as claimed in claim 5
Method, is characterized in that：In the step (4), the computational methods of the zero frequency time period inserted are：
In formula θ be phase angle difference, θ1For DG output voltage phase angles, θ2For busbar voltage phase angle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710142264.4A CN106684926B (en) | 2017-03-10 | 2017-03-10 | Mix the presynchronization control method of the DC/AC inverter of micro-capacitance sensor black starting-up process |
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| CN201710142264.4A CN106684926B (en) | 2017-03-10 | 2017-03-10 | Mix the presynchronization control method of the DC/AC inverter of micro-capacitance sensor black starting-up process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769263A (en) * | 2017-10-19 | 2018-03-06 | 华中科技大学 | VSC black starting-ups device and black-start method based on Phase Locked Loop Synchronization control |
| CN111224425A (en) * | 2020-02-18 | 2020-06-02 | 山东大学 | Wind storage system black start frequency control method and system based on hierarchical predictive control |
| WO2022143276A1 (en) * | 2020-12-30 | 2022-07-07 | 华为数字能源技术有限公司 | Energy storage system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723741A (en) * | 2012-04-26 | 2012-10-10 | 南京航空航天大学 | Grid connection presynchronization control method of microgrid inverter based on droop control |
| EP2940826A1 (en) * | 2012-12-27 | 2015-11-04 | Kawasaki Jukogyo Kabushiki Kaisha | Combined power generation system equipped with power conversion device |
-
2017
- 2017-03-10 CN CN201710142264.4A patent/CN106684926B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723741A (en) * | 2012-04-26 | 2012-10-10 | 南京航空航天大学 | Grid connection presynchronization control method of microgrid inverter based on droop control |
| EP2940826A1 (en) * | 2012-12-27 | 2015-11-04 | Kawasaki Jukogyo Kabushiki Kaisha | Combined power generation system equipped with power conversion device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769263A (en) * | 2017-10-19 | 2018-03-06 | 华中科技大学 | VSC black starting-ups device and black-start method based on Phase Locked Loop Synchronization control |
| CN107769263B (en) * | 2017-10-19 | 2019-07-09 | 华中科技大学 | VSC black starting-up device and black-start method based on Phase Locked Loop Synchronization control |
| CN111224425A (en) * | 2020-02-18 | 2020-06-02 | 山东大学 | Wind storage system black start frequency control method and system based on hierarchical predictive control |
| WO2022143276A1 (en) * | 2020-12-30 | 2022-07-07 | 华为数字能源技术有限公司 | Energy storage system |
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