CN111682564B - Active synchronous control method and system for distributed energy storage fast smooth grid connection - Google Patents
Active synchronous control method and system for distributed energy storage fast smooth grid connection Download PDFInfo
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- CN111682564B CN111682564B CN202010508699.8A CN202010508699A CN111682564B CN 111682564 B CN111682564 B CN 111682564B CN 202010508699 A CN202010508699 A CN 202010508699A CN 111682564 B CN111682564 B CN 111682564B
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
Abstract
The invention discloses an active synchronous control method and system for distributed energy storage fast smooth grid connection, wherein the method comprises the following steps: acquiring a first voltage vector of distributed energy storage and a first voltage vector of a power grid, and generating a frequency synchronization control signal and a voltage synchronization control signal of a distributed energy storage unit by using a PI (proportional integral) controller; inputting the frequency synchronization control signal and the voltage synchronization control signal into a droop controller for calculation, and generating an output voltage reference signal of the distributed energy storage unit; the actual output voltage of the distributed energy storage unit is adjusted based on the output voltage reference signal through the cooperative control of the voltage and current double-ring controller and the inverter; judging whether the adjusted actual output voltage meets the grid-connected control requirement on the distributed energy storage units or not based on the distributed energy storage quasi-synchronization grid-connected standard; and if so, carrying out grid-connected operation on the distributed energy storage units. The embodiment of the invention can reduce the impact and adverse effect on the power grid or the user side in the grid connection process.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to an active synchronous control method and system for distributed energy storage fast smooth grid connection.
Background
The application development of the distributed energy storage technology has important strategic significance for constructing a clean, low-carbon, safe and efficient modern energy industry system, promoting the supply side reform of the energy industry in China and promoting the energy production and utilization mode reform. Active-frequency/reactive-voltage droop control is a research hotspot in a distributed energy storage peer-to-peer control mode, but frequency and voltage as droop control quantities can generate deviation, and due to the lack of support of a large power grid in an island operation mode, large voltage and frequency deviation can be caused under the frequent change of load. When the distributed energy storage is switched from an island operation mode to a grid-connected operation mode, the distributed energy storage may cause impacts such as overvoltage and overcurrent, and if the switching between the two operation modes is not as smooth as possible, the impacts and adverse effects may be caused on a power grid and a user side. Therefore, research on a control technology that the distributed energy storage device can be flexibly connected to a power grid is a basis for realizing plug and play of distributed energy storage, and is particularly important for research on an active synchronous control strategy for fast and smooth grid connection.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an active synchronous control method and system for rapid and smooth grid connection of distributed energy storage.
In order to solve the above problems, the present invention provides an active synchronization control method for fast and smooth grid connection of distributed energy storage, wherein the method comprises:
acquiring a first distributed energy storage voltage vector and a first power grid voltage vector;
generating a frequency synchronization control signal and a voltage synchronization control signal of a distributed energy storage unit by using a PI controller based on the distributed energy storage first voltage vector and the power grid first voltage vector;
inputting the frequency synchronization control signal and the voltage synchronization control signal into a droop controller for calculation, and generating an output voltage reference signal of the distributed energy storage unit;
adjusting the actual output voltage of the distributed energy storage unit based on the output voltage reference signal through the cooperative control of a voltage-current double-loop controller and an inverter;
judging whether the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage unit or not based on the distributed energy storage quasi-synchronization grid-connected standard;
and after the fact that the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage unit is judged, grid-connected operation is carried out on the distributed energy storage unit.
Optionally, the distributed energy storage first voltage vector includes a distributed energy storage voltage amplitude, a distributed energy storage voltage frequency, and a distributed energy storage voltage phase angle, and the grid first voltage vector includes a grid voltage amplitude, a grid voltage frequency, and a grid voltage phase angle.
Optionally, the generating, by using the PI controller, the frequency synchronization control signal and the voltage synchronization control signal of the distributed energy storage unit includes:
based on a two-phase static alpha beta coordinate system, carrying out coordinate conversion on the distributed energy storage first voltage vector and the power grid first voltage vector to respectively obtain a distributed energy storage second voltage vector and a power grid second voltage vector;
generating a frequency error signal and a voltage error signal based on the distributed energy storage first voltage vector, the power grid first voltage vector, the distributed energy storage second voltage vector and the power grid second voltage vector;
and respectively adjusting the frequency error signal and the voltage error signal by using a PI controller, and correspondingly outputting a frequency synchronization recovery signal and a voltage synchronization recovery signal.
Optionally, the inputting the frequency synchronization control signal and the voltage synchronization control signal into the droop controller for calculation includes:
acquiring a distributed energy storage first current vector;
calculating active power and reactive power output by the distributed energy storage units through the distributed energy storage first voltage vector and the distributed energy storage first current vector;
performing joint operation on the frequency synchronization control signal and the active power based on the droop controller to obtain frequency information of the output voltage reference signal;
and performing combined operation on the voltage synchronization control signal and the reactive power based on the droop controller to obtain amplitude information of the output voltage reference signal.
Optionally, the generating the output voltage reference signal of the distributed energy storage unit includes:
performing integral operation on the frequency information of the output voltage reference signal to acquire phase information of the output voltage reference signal;
and synthesizing the frequency information, the phase information and the amplitude information into an output voltage reference signal of the distributed energy storage unit.
Optionally, the adjusting the actual output voltage of the distributed energy storage unit based on the output voltage reference signal includes:
inputting the output voltage reference signal into the voltage and current dual-loop controller, and generating a PWM control signal based on a space vector pulse width modulation algorithm;
and controlling the inverter of the distributed energy storage unit by using the PWM control signal so as to adjust the actual output voltage of the distributed energy storage unit.
Optionally, the distributed energy storage quasi-synchronization grid-connected standard is as follows:
wherein f is i 'is the adjusted actual output voltage frequency of the distributed energy storage unit, theta' g Is the adjusted actual output voltage phase angle, U' i Is the adjusted actual output voltage amplitude f of the distributed energy storage unit' g Is the frequency, θ ', of the current grid voltage' g Is the phase angle, U ', of the current grid voltage' g Is the amplitude of the current grid voltage.
Optionally, after determining whether the adjusted actual output voltage meets the grid-connected control requirement for the distributed energy storage unit, the method further includes:
and after the fact that the adjusted actual output voltage cannot meet the grid-connected control requirement of the distributed energy storage unit is judged, returning to obtain the first voltage vector of the distributed energy storage and the first voltage vector of the power grid, and starting a new round of grid-connected request processing.
In addition, an embodiment of the present invention provides an active synchronous control system for distributed energy storage fast and smooth grid connection, where the system includes:
the acquisition module is used for acquiring a first distributed energy storage voltage vector and a first power grid voltage vector;
the extraction module is used for generating a frequency synchronization control signal and a voltage synchronization control signal of the distributed energy storage unit by using a PI (proportional integral) controller based on the distributed energy storage first voltage vector and the power grid first voltage vector;
the synthesis module is used for inputting the frequency synchronization control signal and the voltage synchronization control signal into a droop controller for calculation and generating an output voltage reference signal of the distributed energy storage unit;
the adjusting module is used for adjusting the actual output voltage of the distributed energy storage unit based on the output voltage reference signal through the cooperative control of the voltage and current dual-loop controller and the inverter;
the judging module is used for judging whether the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage unit or not based on the distributed energy storage quasi-synchronization grid-connected standard;
and the control module is used for carrying out grid-connected operation on the distributed energy storage units after judging that the adjusted actual output voltage meets the grid-connected control requirement on the distributed energy storage units.
Optionally, the distributed energy storage first voltage vector includes a distributed energy storage voltage amplitude, a distributed energy storage voltage frequency, and a distributed energy storage voltage phase angle, and the grid first voltage vector includes a grid voltage amplitude, a grid voltage frequency, and a grid voltage phase angle.
In the embodiment of the invention, the requirement on the communication speed of the distributed energy storage units can be greatly reduced by directly obtaining the distributed energy storage voltage vector and the power grid voltage vector for analysis, the dilemma that the time domain signals of the main power grid voltage and the distributed energy storage voltage are difficult to acquire at high speed due to distance limitation in the existing engineering is improved, and the execution difficulty of the fast and smooth grid-connected control work of the distributed energy storage is reduced; and the droop control is adopted to carry out smooth switching from the island operation mode to the grid-connected operation mode, so that the impact and adverse effect on a power grid or a user side in the distributed energy storage grid-connected process can be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an active synchronization control method for distributed energy storage fast smooth grid connection disclosed in an embodiment of the present invention;
fig. 2 is a schematic structural composition diagram of a distributed active synchronous control system for fast and smooth energy storage grid connection, disclosed in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of an active synchronization control method for distributed energy storage fast smooth grid connection in an embodiment of the present invention, where the method includes the following steps:
s101, obtaining a first distributed energy storage voltage vector and a first power grid voltage vector;
in the embodiment of the invention, in consideration of the distance limiting condition that the high-speed communication mode is adopted to collect the voltage time-domain signal of the main power grid in the prior art, the distributed energy storage unit directly collects the first distributed energy storage voltage vector and the first power grid voltage vector in the prior low-speed communication mode for analysis so as to reduce the requirement on the communication speed. The distributed energy storage first voltage vector comprises a distributed energy storage voltage amplitude, a distributed energy storage voltage frequency and a distributed energy storage voltage phase angle, and the power grid first voltage vector comprises a power grid voltage amplitude, a power grid voltage frequency and a power grid voltage phase angle.
S102, generating a frequency synchronization control signal and a voltage synchronization control signal of a distributed energy storage unit by using a PI (proportional integral) controller based on the distributed energy storage first voltage vector and the power grid first voltage vector;
the specific implementation process comprises the following steps:
(1) Based on a two-phase static alpha beta coordinate system, performing coordinate conversion on the distributed energy storage first voltage vector and the power grid first voltage vector, and respectively acquiring a distributed energy storage second voltage vector and a power grid second voltage vector as follows:
the expression of the distributed energy storage second voltage vector is as follows:
the expression of the second voltage vector of the power grid is as follows:
wherein, U iα Storing a second voltage vector for the distributed energy store
Alpha-axis component of (1), U iβ Storing a second voltage vector for the distributed energy store
Beta axis component of (U) gα For the second voltage vector of the network
Alpha-axis component of (1), U gβ For the second voltage vector of the network
The beta axis component of (c).
(2) Generating a frequency error signal and a voltage error signal based on the distributed energy storage first voltage vector, the power grid first voltage vector, the distributed energy storage second voltage vector and the power grid second voltage vector;
a. the frequency error signal is generated as follows:
performing cross multiplication on the distributed energy storage first voltage vector and the power grid first voltage vector:
performing cross multiplication on the distributed energy storage second voltage vector and the power grid second voltage vector:
based on the invariance principle after coordinate transformation, the following results are obtained:
calculating the frequency Error signal Error (f, θ) as:
wherein the content of the first and second substances,
for the distributed energy storage first voltage vector,
is the first voltage vector, U, of the power grid i For the distributed energy storage voltage amplitude, U g For the grid voltage amplitude, f i For the distributed storage voltage frequency, f g For the frequency of the network voltage, theta i For the distributed storage voltage phase angle, θ g And f is the frequency of the error signal, and theta is the phase angle of the error signal.
b. Calculating the voltage Error signal Error (U) as:
wherein U is the amplitude of the error signal,
is the magnitude of the grid second voltage vector,
and the amplitude of the second voltage vector of the distributed energy storage. It should be noted that f, θ and U are not particularly significant, and are only used to distinguish the frequency error signal from the voltage error signal.
(3) And respectively adjusting the frequency error signal and the voltage error signal by using a PI controller, and correspondingly outputting a frequency synchronization recovery signal and a voltage synchronization recovery signal as follows:
the frequency synchronization recovery signal (f, theta) syn Comprises the following steps:
the voltage synchronization recovery signal U syn Comprises the following steps:
wherein k is pf Is the frequency proportionality coefficient, k, of the PI controller if A time delay effect is achieved for the frequency integral coefficient of the PI controller and s is a time parameter, k pU Is the voltage proportionality coefficient, k, of the PI controller iU And the voltage integral coefficient of the PI controller.
S103, inputting the frequency synchronization control signal and the voltage synchronization control signal into a droop controller for calculation, and generating an output voltage reference signal of the distributed energy storage unit;
the specific implementation process comprises the following steps: directly collecting a first distributed energy storage current vector by the distributed energy storage unit by using the existing low-speed communication mode; solving an output power factor of the distributed energy storage unit according to a known phase relation between the distributed energy storage first voltage vector and the distributed energy storage first current vector, and respectively calculating active power and reactive power output by the distributed energy storage unit by using the output power factor; then, the droop controller is used for carrying out combined operation on the frequency synchronization control signal and the active power to obtain frequency information f of the output voltage reference signal i Comprises the following steps:
f i ＝f 0 +(f,θ) syn -m i (P 0 -P i )
performing a joint operation on the voltage synchronization control signal and the reactive power based on the droop controller to obtain amplitude information U of the output voltage reference signal i Comprises the following steps:
U i ＝U 0 +U syn -n i (Q 0 -Q i )
wherein f is 0 For a rated output frequency of the distributed energy storage unit，P 0 Is the rated active power, P, of the distributed energy storage unit i Is the active power, m, output by the distributed energy storage unit i For active droop control coefficient, U 0 Is the rated output voltage, Q, of the distributed energy storage unit 0 Rated reactive power, Q, of the distributed energy storage unit i Is the reactive power output by the distributed energy storage unit, n i The reactive droop control coefficient is obtained;
then, performing integral operation on the frequency information of the output voltage reference signal to obtain the phase information of the output voltage reference signal; and finally, synthesizing the frequency information, the phase information and the amplitude information into an output voltage reference signal of the distributed energy storage unit.
S104, adjusting the actual output voltage of the distributed energy storage unit based on the output voltage reference signal through the cooperative control of a voltage and current double-loop controller and an inverter;
the specific implementation process comprises the following steps: inputting the output voltage reference signal into the voltage-current double-loop controller, and generating a PWM control signal based on a space vector pulse width modulation algorithm; and controlling the inverter of the distributed energy storage unit by using the PWM control signal so as to adjust the actual output voltage of the distributed energy storage unit in real time, so that the final output voltage of the distributed energy storage unit can quickly and effectively track the voltage of a power grid.
S105, judging whether the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage unit or not based on the distributed energy storage quasi-synchronization grid-connected standard;
the specific implementation process comprises the following steps: firstly, according to the invention, with reference to the IEEE Std 1547-2003 standard (i.e. the standard for accessing a distributed power supply to a power system), the standard for quasi-synchronization grid connection of distributed energy storage is set as follows:
wherein f is i ' is adjustedActual output voltage frequency of the distributed energy storage unit is theta' i Is the adjusted actual output voltage phase angle, U' i Is the adjusted actual output voltage amplitude f of the distributed energy storage unit' g Is the frequency, θ ', of the current grid voltage' g Is the phase angle, U ', of the current grid voltage' g The amplitude of the current power grid voltage is obtained;
secondly, after the actual output voltage of the distributed energy storage unit is adjusted, the distributed energy storage unit is used for collecting the current power grid voltage in a low-speed communication mode; finally, respectively substituting the time domain signals of the two mentioned voltages into the three conditions provided by the distributed energy storage quasi-synchronization grid-connected standard for judgment; if the adjusted actual output voltage can simultaneously satisfy the three conditions, it is indicated that the adjusted actual output voltage satisfies the grid-connected control requirement of the distributed energy storage unit, and the step S106 is continuously executed; if the adjusted actual output voltage cannot meet one or more of the three conditions, it is indicated that the adjusted actual output voltage cannot meet the grid-connected control requirement on the distributed energy storage unit, the step S101 is returned to, and a new round of grid-connected request processing is started.
And S106, carrying out grid-connected operation on the distributed energy storage unit.
In the embodiment of the invention, in order to ensure the stability and anti-interference performance of the distributed energy storage unit after grid connection is completed, after the output duration time of the adjusted actual output voltage exceeds 10 fundamental wave periods, the grid connection switch is triggered to be in a closed state, so that the distributed energy storage unit is switched from an island operation mode to a grid connection operation mode.
Fig. 2 is a schematic structural composition diagram of an active synchronous control system for distributed energy storage fast smooth grid connection in an embodiment of the present invention, where the system includes:
the obtaining module 201 is configured to obtain a distributed energy storage first voltage vector and a grid first voltage vector, where the distributed energy storage first voltage vector includes a distributed energy storage voltage amplitude, a distributed energy storage voltage frequency, and a distributed energy storage voltage phase angle, and the grid first voltage vector includes a grid voltage amplitude, a grid voltage frequency, and a grid voltage phase angle.
The extraction module 202 is configured to generate a frequency synchronization control signal and a voltage synchronization control signal of the distributed energy storage unit by using a PI controller based on the distributed energy storage first voltage vector and the grid first voltage vector;
the synthesizing module 203 is configured to input the frequency synchronization control signal and the voltage synchronization control signal to a droop controller for calculation, and generate an output voltage reference signal of the distributed energy storage unit;
the adjusting module 204 is configured to adjust an actual output voltage of the distributed energy storage unit based on the output voltage reference signal through cooperative control of a voltage-current dual-loop controller and an inverter;
the judging module 205 judges whether the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage unit based on the distributed energy storage quasi-synchronization grid-connected standard;
and the control module 206 is configured to perform grid-connection operation on the distributed energy storage units after judging that the adjusted actual output voltage meets the grid-connection control requirement on the distributed energy storage units.
Since the system is configured to execute the active synchronization control method for fast and smooth grid connection of distributed energy storage, the above embodiment is referred to for specific implementation of each module in the system, and details are not repeated here.
In the embodiment of the invention, the distributed energy storage voltage vector and the power grid voltage vector are directly obtained and analyzed, so that the requirement on the communication speed of the distributed energy storage unit can be greatly reduced, the dilemma that the time domain signals of the main power grid voltage and the distributed energy storage voltage are difficult to acquire at high speed due to distance limitation in the existing engineering is improved, and the execution difficulty of the fast and smooth grid-connected control work of the distributed energy storage is reduced; and the droop control is adopted to carry out smooth switching from the island operation mode to the grid-connected operation mode, so that the impact and adverse effect on a power grid or a user side in the distributed energy storage grid-connected process can be reduced.
In addition, the active synchronization control method and system for distributed energy storage fast and smooth grid connection provided by the embodiment of the invention are introduced in detail, a specific embodiment is adopted in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An active synchronization control method for distributed energy storage fast smooth grid connection is characterized by comprising the following steps:
acquiring a first distributed energy storage voltage vector and a first power grid voltage vector;
generating a frequency synchronization control signal and a voltage synchronization control signal of a distributed energy storage unit by using a PI (proportional integral) controller based on the distributed energy storage first voltage vector and the power grid first voltage vector;
inputting the frequency synchronization control signal and the voltage synchronization control signal into a droop controller for calculation, and generating an output voltage reference signal of the distributed energy storage unit;
adjusting the actual output voltage of the distributed energy storage unit based on the output voltage reference signal through the cooperative control of a voltage and current dual-loop controller and an inverter;
judging whether the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage unit or not based on the distributed energy storage quasi-synchronization grid-connected standard;
and after the fact that the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage units is judged, grid-connected operation is carried out on the distributed energy storage units.
2. The active synchronization control method for the distributed energy storage fast and smooth grid connection according to claim 1, wherein the distributed energy storage first voltage vector comprises a distributed energy storage voltage amplitude, a distributed energy storage voltage frequency and a distributed energy storage voltage phase angle, and the grid first voltage vector comprises a grid voltage amplitude, a grid voltage frequency and a grid voltage phase angle.
3. The active synchronous control method for distributed energy storage fast smooth grid connection according to claim 2, wherein the generating of the frequency synchronous control signal and the voltage synchronous control signal of the distributed energy storage unit by using the PI controller comprises:
based on a two-phase static alpha beta coordinate system, performing coordinate conversion on the distributed energy storage first voltage vector and the power grid first voltage vector to respectively obtain a distributed energy storage second voltage vector and a power grid second voltage vector;
generating a frequency error signal and a voltage error signal based on the distributed energy storage first voltage vector, the grid first voltage vector, the distributed energy storage second voltage vector, and the grid second voltage vector;
and respectively adjusting the frequency error signal and the voltage error signal by using a PI controller, and correspondingly outputting a frequency synchronization recovery signal and a voltage synchronization recovery signal.
4. The active synchronization control method for distributed energy storage fast and smooth grid connection according to claim 1, wherein the inputting the frequency synchronization control signal and the voltage synchronization control signal into a droop controller for calculation comprises:
acquiring a distributed energy storage first current vector;
calculating active power and reactive power output by the distributed energy storage units through the distributed energy storage first voltage vector and the distributed energy storage first current vector;
performing joint operation on the frequency synchronization control signal and the active power based on the droop controller to obtain frequency information of the output voltage reference signal;
and performing combined operation on the voltage synchronization control signal and the reactive power based on the droop controller to obtain amplitude information of the output voltage reference signal.
5. The active synchronization control method for distributed energy storage fast and smooth grid connection according to claim 4, wherein the generating of the output voltage reference signal of the distributed energy storage unit comprises:
performing integral operation on the frequency information of the output voltage reference signal to acquire phase information of the output voltage reference signal;
and synthesizing the frequency information, the phase information and the amplitude information into an output voltage reference signal of the distributed energy storage unit.
6. The active synchronization control method for distributed energy storage fast and smooth grid connection according to claim 1, wherein the adjusting the actual output voltage of the distributed energy storage units based on the output voltage reference signal comprises:
inputting the output voltage reference signal into the voltage-current double-loop controller, and generating a PWM control signal based on a space vector pulse width modulation algorithm;
and controlling the inverter of the distributed energy storage unit by using the PWM control signal so as to adjust the actual output voltage of the distributed energy storage unit.
7. The active synchronous control method for the distributed energy storage fast and smooth grid connection according to claim 1, wherein the distributed energy storage quasi-synchronization grid connection standard is as follows:
wherein, f' i For the adjusted actual output voltage frequency of the distributed energy storage unitRate, θ' i Is an adjusted actual output voltage phase angle, U 'of the distributed energy storage unit' i Is the adjusted actual output voltage amplitude f of the distributed energy storage unit' g Is the frequency, θ ', of the current grid voltage' g Is the phase angle, U ', of the current grid voltage' g Is the amplitude of the current grid voltage.
8. The active synchronous control method for the distributed energy storage fast and smooth grid connection according to claim 7, after determining whether the adjusted actual output voltage meets the grid connection control requirement for the distributed energy storage unit, further comprising:
and after the fact that the adjusted actual output voltage cannot meet the grid-connected control requirement of the distributed energy storage unit is judged, returning to obtain the first voltage vector of the distributed energy storage and the first voltage vector of the power grid, and starting a new round of grid-connected request processing.
9. The utility model provides a quick smooth initiative synchro-control system who is incorporated into power networks of distributed energy storage which characterized in that, the system includes:
the acquisition module is used for acquiring a first distributed energy storage voltage vector and a first power grid voltage vector;
the extraction module is used for generating a frequency synchronization control signal and a voltage synchronization control signal of the distributed energy storage unit by using a PI (proportional integral) controller based on the distributed energy storage first voltage vector and the power grid first voltage vector;
the synthesis module is used for inputting the frequency synchronization control signal and the voltage synchronization control signal into a droop controller for calculation and generating an output voltage reference signal of the distributed energy storage unit;
the adjusting module is used for adjusting the actual output voltage of the distributed energy storage unit based on the output voltage reference signal through the cooperative control of the voltage and current dual-loop controller and the inverter;
the judging module is used for judging whether the adjusted actual output voltage meets the grid-connected control requirement of the distributed energy storage unit or not based on the distributed energy storage quasi-synchronization grid-connected standard;
and the control module is used for carrying out grid-connected operation on the distributed energy storage units after judging that the adjusted actual output voltage meets the grid-connected control requirement on the distributed energy storage units.
10. The active synchronous control system of distributed energy storage fast smooth grid connection according to claim 9, wherein the distributed energy storage first voltage vector comprises a distributed energy storage voltage amplitude, a distributed energy storage voltage frequency and a distributed energy storage voltage phase angle, and the grid first voltage vector comprises a grid voltage amplitude, a grid voltage frequency and a grid voltage phase angle.
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| CN102185341A (en) * | 2011-04-14 | 2011-09-14 | 天津大学 | Master-slave control strategy microgrid-based main power supply double-mode running control method |
| 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 |
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