CN112290593B - Grid-connected inverter anti-reflux control method for 180-degree phase angle split-phase power grid - Google Patents

Grid-connected inverter anti-reflux control method for 180-degree phase angle split-phase power grid Download PDF

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CN112290593B
CN112290593B CN202011199593.0A CN202011199593A CN112290593B CN 112290593 B CN112290593 B CN 112290593B CN 202011199593 A CN202011199593 A CN 202011199593A CN 112290593 B CN112290593 B CN 112290593B
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current
inverter
phase
grid
control
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CN112290593A (en
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刘超厚
李新富
郭华为
施鑫淼
随晓宇
程亮亮
魏琪康
陈位旭
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Solax Power Network Technology Zhejiang Co Ltd
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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
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]

Abstract

The invention discloses a grid-connected inverter anti-reflux control method for a 180-degree phase angle split-phase power grid, which comprises the following steps of: establishing a three-bridge arm inverter topology, and establishing an inductive current differential equation; setting differential mode control quantity and common mode control quantity, and introducing the differential mode control quantity and the common mode control quantity into an inductive current differential equation; deducing open-loop digital models of differential mode and common mode of the inverter inductance current; the method comprises the steps of collecting current of a grid-connected port of an inverter, obtaining a differential mode current reference value, a common mode current reference value, a differential mode current feedback value and a common mode current feedback value, carrying out closed-loop control, obtaining the duty ratio of each switching tube of three bridge arms of the inverter, and finally realizing anti-backflow control on each phase of grid-connected power of a split-phase power grid. The method has the characteristics of realizing the optimal use of photovoltaic energy by controlling each phase of the split-phase power grid photovoltaic inverter against reverse current, having no limitation in use and protecting the economic benefits of users.

Description

Grid-connected inverter anti-reflux control method for 180-degree phase angle split-phase power grid
Technical Field
The invention relates to a control method of an inverter, in particular to a grid-connected inverter anti-reflux control method for a 180-degree phase angle split-phase power grid.
Background
Photovoltaic solar energy is a clean energy, is greatly supported by a plurality of countries in recent years, has larger installed capacity, and is easy to cause instability of a power grid because excessive photovoltaic energy is transmitted to the power grid in countries with higher installed photovoltaic capacity. At present, more and more inverters require grid-connected inverters to limit power capacity according to power grid conditions, some local regulations require that photovoltaic energy is not accurately transmitted to a power grid, and only household load consumption of users can be supplied or stored by a battery of an energy storage inverter, even some local regulations provide certain punishment policies for users who transmit photovoltaic electric quantity to the power grid, and therefore more and more photovoltaic grid-connected inverters require a backflow prevention function in order to prevent the grid-connected inverters from transmitting power to the power grid.
For countries using split-phase grids, for example, the grid in japan is divided into U-phase and W-phase with an angular difference of 180 degrees, two-phase voltage of 101V and line voltage of 202V, as shown in fig. 1. The low-power household load is connected to the U-phase or W-phase voltage, the high-power load is connected to the line voltage, and the user cannot equally distribute the low-power household load to the U-phase and W-phase power networks, so that the user load is unbalanced in power supply from the U-phase and the W-phase. However, the existing grid-connected inverter anti-reflux scheme often limits the sum of the power transmitted by the grid-connected inverter to the U-phase and the W-phase to zero, and when the loads connected to the U-phase and the W-phase by a user are unbalanced, the user may have a load of one phase that needs to be taken from the mains supply because of insufficient photovoltaic energy, and the other phase has a large photovoltaic energy, and the surplus energy is transmitted to the power grid, so that the total effect is that the sum of the two-phase power is zero. However, according to the scheme, each phase of anti-countercurrent control of the split-phase power grid cannot be well realized, the phenomenon that photovoltaic electric quantity is transmitted to the power grid can be caused, photovoltaic energy is lost, photovoltaic energy cannot be optimally used, regulations can be violated, and use limitation is caused.
Therefore, the existing grid-connected inverter anti-reflux scheme has the problems that the photovoltaic energy cannot be optimally used, the use is limited, and certain economic loss is caused to users.
Disclosure of Invention
The invention aims to provide a grid-connected inverter anti-reflux control method for a 180-degree phase angle split-phase power grid. The method has the characteristics of realizing the optimal use of photovoltaic energy by controlling each phase of the split-phase power grid photovoltaic inverter against reverse current, having no limitation in use and protecting the economic benefits of users.
The technical scheme of the invention is as follows: the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid comprises the following steps of:
a. establishing a three-bridge arm inverter topology, and respectively establishing an inductive current differential equation for three bridge arms of the inverter;
b. dividing the three bridge arms into differential mode control and common mode control, and establishing differential mode control quantity and common mode control quantity;
c. substituting the differential mode control quantity and the common mode control quantity into an inductance current differential equation, and deducing a differential equation based on differential mode current and common mode current;
d. deducing an open-loop digital model of the inverter inductance current based on differential mode control and common mode control through a differential equation based on the differential mode current and the common mode current, and designing a current closed-loop control system;
e. collecting the current of a grid-connected port of the inverter to obtain a differential mode current reference value, a common mode current reference value, a differential mode current feedback value and a common mode current feedback value;
f. obtaining differential mode current control loop output
Figure 143316DEST_PATH_IMAGE001
And common mode current control loop output
Figure 104319DEST_PATH_IMAGE002
And calculating the duty ratio of each switching tube, and finally realizing the anti-reflux control of each phase grid-connected power of the split-phase power grid.
In the aforementioned grid-connected inverter anti-reflux control method for 180-degree phase angle split-phase power grid, in step a, the three-bridge arm inverter includes three first switching tubes S1、S2、S3And three second switching tubes:
Figure 80365DEST_PATH_IMAGE003
、
Figure 293172DEST_PATH_IMAGE004
、
Figure 405484DEST_PATH_IMAGE005
three inductors: l isa、Lb、Lc；S1, S2, S3Are respectively connected with the second switch tube
Figure 802968DEST_PATH_IMAGE003
、
Figure 266310DEST_PATH_IMAGE004
、
Figure 345124DEST_PATH_IMAGE005
Corresponding series connection, S1Is driven by
Figure 765740DEST_PATH_IMAGE003
Driving of (S) is complementary2Is driven by
Figure 271808DEST_PATH_IMAGE004
Driving of (S) is complementary3Is driven by
Figure 19184DEST_PATH_IMAGE005
Driving of (S) is complementary1And
Figure 636110DEST_PATH_IMAGE003
is connected with La，S2And
Figure 660698DEST_PATH_IMAGE004
is connected with Lb，S3And
Figure 603246DEST_PATH_IMAGE005
is connected with Lc，S1, S2, S3The input ends of the two-phase inverter are connected with the positive electrode of a power supply at the input side of the inverter,
Figure 775601DEST_PATH_IMAGE003
、
Figure 258535DEST_PATH_IMAGE004
、
Figure 199946DEST_PATH_IMAGE005
the output terminals of the inverter are all connected with the negative pole of the power supply at the input side of the inverter.
In the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid, the specific establishment process of the inductive current differential equation in the step a is as follows: let S1、S2、S3Respectively is d1、d2、d3And respectively establishing an inductive current differential equation for three bridge arms of the inverter:
Figure 313396DEST_PATH_IMAGE006
（1）；
Figure 910730DEST_PATH_IMAGE007
（2）；
Figure 869459DEST_PATH_IMAGE008
（3）；
Figure 993273DEST_PATH_IMAGE009
（4）；
setting the duty ratios of S1 and S3 to be complementary, then
Figure 12045DEST_PATH_IMAGE010
（5）；
Formula (1) is reduced by formula (3) to obtain
Figure 158992DEST_PATH_IMAGE011
（6）；
Multiplying the formula (2) by the formula (1) and subtracting the formula (3) to obtain
Figure 859095DEST_PATH_IMAGE012
（7）；
Bringing formula (4) and formula (5) into formula (7) to obtain
Figure 775098DEST_PATH_IMAGE013
（8）；
Wherein
Figure 27088DEST_PATH_IMAGE014
There are three inductive currents respectively, and the inductive current,
Figure 395752DEST_PATH_IMAGE015
for the voltage at the input side of the inverter,
Figure 961863DEST_PATH_IMAGE016
is the voltage of the U-phase,
Figure 434170DEST_PATH_IMAGE017
is a W-phase voltage and is,
Figure 794745DEST_PATH_IMAGE018
the grid midpoint and the inverter input negative terminal voltage.
In the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid, in the step b, the differential mode control quantity is as follows:
Figure 713022DEST_PATH_IMAGE019
，
Figure 82824DEST_PATH_IMAGE020
，
Figure 973419DEST_PATH_IMAGE021
，
Figure 442578DEST_PATH_IMAGE022
(ii) a The common mode control quantity is:
Figure 785834DEST_PATH_IMAGE023
，
Figure 490485DEST_PATH_IMAGE024
，
Figure 235587DEST_PATH_IMAGE025
，
Figure 875647DEST_PATH_IMAGE026
。
in the foregoing grid-connected inverter anti-reflux control method for a 180-degree phase angle split-phase power grid, in step c, a differential equation based on a differential mode current and a common mode current is as follows:
the formula (6) is:
Figure 971779DEST_PATH_IMAGE027
（9）；
the formula (8) is:
Figure 417804DEST_PATH_IMAGE028
（10）；
Figure 79729DEST_PATH_IMAGE029
（11）；
Figure 953008DEST_PATH_IMAGE030
（12）；
Figure 208540DEST_PATH_IMAGE031
（13）。
in the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid, in the step d, an open-loop digital model of inverter current control based on differential modulus control is as follows:
Figure 723835DEST_PATH_IMAGE001
is output to
Figure 177950DEST_PATH_IMAGE032
And is and
Figure 284446DEST_PATH_IMAGE033
form a voltage source outputting to 1/s
Figure 89591DEST_PATH_IMAGE034
And then output
Figure 142998DEST_PATH_IMAGE035
(ii) a The open-loop digital model of current control based on common-mode quantity control is as follows:
Figure 887837DEST_PATH_IMAGE002
is output to
Figure 368497DEST_PATH_IMAGE032
And is and
Figure 723255DEST_PATH_IMAGE036
form a voltage source outputting to 1/s
Figure 49194DEST_PATH_IMAGE037
And then output
Figure 415585DEST_PATH_IMAGE038
。
In the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid, in the step e, after the current of the grid-connected port of the inverter is collected, the power values of the U-phase and the W-phase of the grid-connected port of the inverter are calculated and are respectively used as the feedback values of the U-phase and the W-phase power control loops, the reference values of the U-phase and the W-phase power control loops are set to be zero, zero-power grid connection is realized, and the closed-loop control of the U-phase power control loop and the W-phase power control loop is realized through a PI controller respectively.
In the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid, the output value of the PI controller is used as the U-phase and W-phase two-phase currents
Figure 67146DEST_PATH_IMAGE039
And
Figure 643621DEST_PATH_IMAGE040
the differential mode current reference value is
Figure 38830DEST_PATH_IMAGE039
-
Figure 587623DEST_PATH_IMAGE040
The common mode current reference value is
Figure 82189DEST_PATH_IMAGE039
+
Figure 83643DEST_PATH_IMAGE040
。
In the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid, in step e, the method for obtaining the differential mode current feedback value and the common mode current feedback value includes: and respectively obtaining U-phase and W-phase inductance current values of the grid-connected port of the inverter through current sampling, and respectively adding and subtracting the two-phase inductance current values to obtain an inductance current difference module value and an inductance current common module value which are respectively used as feedback values of differential mode current closed-loop control and common mode current control.
Compared with the prior art, under the split-phase power grid, the split-phase power grid anti-reflux control method has the advantages that the power of the grid-connected port is collected, the purpose of controlling the power of the two-phase grid-connected port to be zero at the same time is achieved through closed-loop power control, the two-phase grid-connected current reference value of the grid-connected inverter is generated, the current reference value is converted into the differential mode current reference value and the common mode current reference value respectively, and the anti-reflux control of each phase of power of the split-phase power grid is achieved through the closed-loop control of the differential mode current reference value and the common mode current reference value. The final effect is that under the condition of sufficient photovoltaic energy, each phase of load can be realized without taking power from the power grid, so that the economic loss of users is reduced, and the redundant photovoltaic energy can not be transmitted to the power grid, so that the energy loss can not be caused, the power grid regulation can not be triggered, and the use is not limited; when the photovoltaic energy is insufficient, the optimal use of the photovoltaic energy can be realized, the photovoltaic energy cannot be wasted due to a power grid for transmission, the user load can maximally use the photovoltaic energy, the electric quantity taken by the household load from the commercial power is reduced, the electric charge of the user is reduced, and the economic benefit of the user is protected as much as possible.
Therefore, the method has the characteristics of realizing the optimal use of photovoltaic energy by controlling each phase of the split-phase grid photovoltaic inverter against reverse current, having no limitation in use and protecting the economic benefits of users.
Drawings
FIG. 1 is a schematic diagram of a split-phase power grid;
FIG. 2 is a schematic diagram of a circuit topology of a split-phase grid photovoltaic inverter or an energy storage inverter;
FIG. 3 is a block diagram of a mathematical model of differential mode current control of an inverter;
FIG. 4 is a block diagram of a mathematical model of inverter common mode current control;
FIG. 5 is a system schematic of an energy storage inverter;
fig. 6 is a control block diagram of the photovoltaic grid-connected inverter or the energy storage inverter of the invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Examples are given.
The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid comprises the following steps of:
a. establishing a three-bridge arm inverter topology, and respectively establishing an inductive current differential equation for three bridge arms of the inverter;
as shown in fig. 2, the three-leg inverter includes three first switching tubes S1、S2、S3And three second switching tubes:
Figure 282544DEST_PATH_IMAGE003
、
Figure 748160DEST_PATH_IMAGE004
、
Figure 475945DEST_PATH_IMAGE005
three inductors: l isa、Lb、Lc；S1, S2, S3Are respectively connected with the second switch tube
Figure 902378DEST_PATH_IMAGE003
、
Figure 373811DEST_PATH_IMAGE004
、
Figure 897196DEST_PATH_IMAGE005
Corresponding series connection, S1Is driven by
Figure 123778DEST_PATH_IMAGE003
Driving of (S) is complementary2Is driven by
Figure 99824DEST_PATH_IMAGE004
Driving of (S) is complementary3Is driven by
Figure 374948DEST_PATH_IMAGE005
Driving of (S) is complementary1And
Figure 189058DEST_PATH_IMAGE003
is connected with La，S2And
Figure 258645DEST_PATH_IMAGE004
is connected with Lb，S3And
Figure 784304DEST_PATH_IMAGE005
is connected with Lc，S1, S2, S3The input ends of the two-phase inverter are connected with the positive electrode of a power supply at the input side of the inverter,
Figure 863118DEST_PATH_IMAGE003
、
Figure 95517DEST_PATH_IMAGE004
、
Figure 539267DEST_PATH_IMAGE005
the output terminals of the inverter are all connected with the negative pole of the power supply at the input side of the inverter.
The specific establishment process of the inductance current differential equation is as follows: using a three-leg inverter topology, setting the duty ratios of S1, S2 and S3 as d1, d2 and d3 respectively, and establishing an inductive current differential equation for the three legs of the inverter respectively:
Figure 489906DEST_PATH_IMAGE006
（1）；
Figure 106832DEST_PATH_IMAGE007
（2）；
Figure 256054DEST_PATH_IMAGE008
（3）；
Figure 933023DEST_PATH_IMAGE009
（4）；
setting the duty ratios of S1 and S3 to be complementary, then
Figure 43061DEST_PATH_IMAGE010
（5）；
Formula (1) is reduced by formula (3) to obtain
Figure 463678DEST_PATH_IMAGE041
（6）；
Multiplying the formula (2) by the formula (1) and subtracting the formula (3) to obtain
Figure 670669DEST_PATH_IMAGE012
（7）；
Bringing formula (4) and formula (5) into formula (7) to obtain
Figure 580856DEST_PATH_IMAGE013
（8）；
Wherein
Figure 506086DEST_PATH_IMAGE014
There are three inductive currents respectively, and the inductive current,
Figure 464815DEST_PATH_IMAGE015
for the voltage at the input side of the inverter,
Figure 198416DEST_PATH_IMAGE016
is the voltage of the U-phase,
Figure 217188DEST_PATH_IMAGE017
is a W-phase voltage and is,
Figure 629714DEST_PATH_IMAGE018
the grid midpoint and the inverter input negative terminal voltage.
b. Dividing the three bridge arms into differential mode control and common mode control, and establishing differential mode control quantity and common mode control quantity; the differential mode control quantity is:
Figure 454451DEST_PATH_IMAGE019
，
Figure 370454DEST_PATH_IMAGE020
，
Figure 560127DEST_PATH_IMAGE021
，
Figure 636448DEST_PATH_IMAGE022
(ii) a The differential mode current magnitude is a two-phase current difference value;
the common mode control quantity is:
Figure 936980DEST_PATH_IMAGE023
，
Figure 35386DEST_PATH_IMAGE024
，
Figure 395960DEST_PATH_IMAGE025
，
Figure 517500DEST_PATH_IMAGE026
(ii) a The common mode current amount is a two-phase current sum value.
c. And substituting the differential mode control quantity and the common mode control quantity into an inductance current differential equation, and deducing a differential equation based on the differential mode current and the common mode current:
the formula (6) is:
Figure 559405DEST_PATH_IMAGE027
（9）；
the formula (8) is:
Figure 184421DEST_PATH_IMAGE028
（10）；
Figure 981476DEST_PATH_IMAGE029
（11）；
Figure 387050DEST_PATH_IMAGE030
（12）；
Figure 294963DEST_PATH_IMAGE031
（13）；
d. deriving an open-loop digital model of the inverter inductance current based on differential mode control and common mode control by differential equations (9) and equations (10) based on the differential mode current and the common mode current; the open-loop digital model of inverter current control based on differential modulus control is as follows:
Figure 305644DEST_PATH_IMAGE001
is output to
Figure 945704DEST_PATH_IMAGE032
And is and
Figure 776257DEST_PATH_IMAGE033
form a voltage source outputting to 1/s
Figure 284599DEST_PATH_IMAGE034
And then output
Figure 149786DEST_PATH_IMAGE035
(ii) a As shown in fig. 3.
The open-loop digital model of current control based on common-mode quantity control is as follows:
Figure 23064DEST_PATH_IMAGE002
is output to
Figure 278596DEST_PATH_IMAGE032
And is and
Figure 262733DEST_PATH_IMAGE036
form a voltage source outputting to 1/s
Figure 248007DEST_PATH_IMAGE037
And then output
Figure 354503DEST_PATH_IMAGE038
As shown in fig. 4.
And designing a current closed-loop control system through an open-loop digital model of the inverter inductance current based on differential mode control and common mode control.
e. As shown in fig. 5-6, in the current closed-loop control system, two current transformers CT are used to collect the current of the inverter grid-connected port, the DSP calculates the power values of the U-phase and W-phase of the inverter grid-connected port, which are used as the feedback values of the U-phase and W-phase power control loops, respectively, and sets the reference values of the U-phase and W-phase power control loops to zero to implement zero-power grid connection, the U-phase and W-phase power control loops implement closed-loop control through the PI controller, respectively, and the output value of the PI controller is used as the output value of the PI controllerIs a U-phase current and a W-phase current
Figure 159648DEST_PATH_IMAGE039
And
Figure 383693DEST_PATH_IMAGE040
reference value of U-phase and W-phase current
Figure 223473DEST_PATH_IMAGE039
And
Figure 438554DEST_PATH_IMAGE040
respectively subtracting and adding to obtain differential mode current reference value
Figure 527733DEST_PATH_IMAGE039
-
Figure 384830DEST_PATH_IMAGE040
And a common mode current reference value
Figure 813538DEST_PATH_IMAGE039
+
Figure 137203DEST_PATH_IMAGE040
(ii) a Obtaining U-phase and W-phase inductance current values respectively through current sampling, and obtaining inductance current difference module values and inductance current common module values by adding and subtracting the two-phase inductance current values respectively, wherein the inductance current difference module values and the inductance current common module values are used as feedback values of difference module current closed-loop control and common module current control respectively to realize current closed-loop control;
f. obtaining output of differential mode current control loop by current closed-loop control and power current closed-loop control respectively
Figure 916940DEST_PATH_IMAGE001
And common mode current control loop output
Figure 312149DEST_PATH_IMAGE002
By passing
Figure 657680DEST_PATH_IMAGE001
、
Figure 480142DEST_PATH_IMAGE002
And the formula (11) -formula (13) respectively calculate the duty ratio of each switching tube of three bridge arms of the inverter, and the independent control of each phase current of the grid-connected split-phase power grid output by the inverter is realized by controlling the on-off of each switching tube, so that the anti-backflow control of each phase grid-connected power of the split-phase power grid is finally realized.

Claims (9)

1. The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid is characterized by comprising the following steps of: the method comprises the following steps:
a. establishing a three-bridge arm inverter topology, and respectively establishing an inductive current differential equation for three bridge arms of the inverter;
b. dividing the three bridge arms into differential mode control and common mode control, and establishing differential mode control quantity and common mode control quantity;
c. substituting the differential mode control quantity and the common mode control quantity into an inductance current differential equation, and deducing a differential equation based on differential mode current and common mode current;
d. deducing an open-loop digital model of the inverter inductance current based on differential mode control and common mode control through a differential equation based on the differential mode current and the common mode current, and designing a current closed-loop control system;
e. collecting the current of a grid-connected port of the inverter to obtain a differential mode current reference value, a common mode current reference value, a differential mode current feedback value and a common mode current feedback value;
f. obtaining differential mode current control loop output
Figure 825331DEST_PATH_IMAGE001
And common mode current control loop output
Figure 555390DEST_PATH_IMAGE002
And calculating the duty ratio of each switching tube, and finally realizing the anti-reflux control of each phase grid-connected power of the split-phase power grid.
2. The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 1, characterized in that: in the step a, the three-bridge-arm inverter comprises three first switching tubes S1、S2、S3And three second switching tubes:
Figure 630793DEST_PATH_IMAGE003
、
Figure 624157DEST_PATH_IMAGE004
、
Figure 175224DEST_PATH_IMAGE005
three inductors: l isa、Lb、Lc；S1, S2, S3Are respectively connected with the second switch tube
Figure 646657DEST_PATH_IMAGE003
、
Figure 340681DEST_PATH_IMAGE004
、
Figure 770525DEST_PATH_IMAGE005
Corresponding series connection, S1Is driven by
Figure 480992DEST_PATH_IMAGE003
Driving of (S) is complementary2Is driven by
Figure 818433DEST_PATH_IMAGE004
Driving of (S) is complementary3Is driven by
Figure 196325DEST_PATH_IMAGE005
Driving of (S) is complementary1And
Figure 203595DEST_PATH_IMAGE003
is connected with La，S2And
Figure 666937DEST_PATH_IMAGE004
is connected with Lb，S3And
Figure 542489DEST_PATH_IMAGE005
is connected with Lc，S1, S2, S3The input ends of the two-phase inverter are connected with the positive electrode of a power supply at the input side of the inverter,
Figure 40467DEST_PATH_IMAGE003
、
Figure 280955DEST_PATH_IMAGE004
、
Figure 169277DEST_PATH_IMAGE005
the output terminals of the inverter are all connected with the negative pole of the power supply at the input side of the inverter.
3. The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 2, characterized in that: the specific establishment process of the inductance current differential equation in the step a is as follows: let S1、S2、S3Respectively is d1、d2、d3And respectively establishing an inductive current differential equation for three bridge arms of the inverter:
Figure 786203DEST_PATH_IMAGE006
（1）；
Figure 935425DEST_PATH_IMAGE007
（2）；
Figure 877973DEST_PATH_IMAGE008
（3）；
Figure 50328DEST_PATH_IMAGE009
（4）；
setting the duty ratios of S1 and S3 to be complementary, then
Figure 143049DEST_PATH_IMAGE010
（5）；
Formula (1) is reduced by formula (3) to obtain
Figure 350039DEST_PATH_IMAGE011
（6）；
Multiplying the formula (2) by the formula (1) and subtracting the formula (3) to obtain
Figure 994647DEST_PATH_IMAGE012
（7）；
Bringing formula (4) and formula (5) into formula (7) to obtain
Figure 654299DEST_PATH_IMAGE013
（8）；
Wherein
Figure 878607DEST_PATH_IMAGE014
There are three inductive currents respectively, and the inductive current,
Figure 376322DEST_PATH_IMAGE015
for the voltage at the input side of the inverter,
Figure 395094DEST_PATH_IMAGE016
is the voltage of the U-phase,
Figure 604358DEST_PATH_IMAGE017
is a W-phase voltage and is,
Figure 101198DEST_PATH_IMAGE018
the grid midpoint and the inverter input negative terminal voltage.
4. The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 3, characterized in that: in the step b, the differential mode control quantity is as follows:
Figure 282781DEST_PATH_IMAGE019
，
Figure 410137DEST_PATH_IMAGE020
，
Figure 44381DEST_PATH_IMAGE021
，
Figure 407229DEST_PATH_IMAGE022
(ii) a The common mode control quantity is:
Figure 177739DEST_PATH_IMAGE023
，
Figure 475996DEST_PATH_IMAGE024
，
Figure 597536DEST_PATH_IMAGE025
，
Figure 701758DEST_PATH_IMAGE026
。
5. the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 4, characterized in that: the differential equation based on the differential mode current and the common mode current in the step c is as follows:
the formula (6) is:
Figure 654671DEST_PATH_IMAGE027
（9）；
the formula (8) is:
Figure 186146DEST_PATH_IMAGE028
（10）；
Figure 467086DEST_PATH_IMAGE029
（11）；
Figure 374999DEST_PATH_IMAGE030
（12）；
Figure 385680DEST_PATH_IMAGE031
（13）。
6. the grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 5, characterized in that: in the step d, the open-loop digital model of the inverter current control based on the differential modulus control is as follows:
Figure 150374DEST_PATH_IMAGE001
is output to
Figure 980927DEST_PATH_IMAGE032
And is and
Figure 597591DEST_PATH_IMAGE033
form a voltage source outputting to 1/s
Figure 728358DEST_PATH_IMAGE034
And then output
Figure 601636DEST_PATH_IMAGE035
(ii) a The open-loop digital model of current control based on common-mode quantity control is as follows:
Figure 981802DEST_PATH_IMAGE002
is output to
Figure 231517DEST_PATH_IMAGE032
And is and
Figure 951212DEST_PATH_IMAGE036
form a voltage source outputting to 1/s
Figure 933074DEST_PATH_IMAGE037
And then output
Figure 738219DEST_PATH_IMAGE038
。
7. The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 1, characterized in that: in the step e, after the current of the grid-connected port of the inverter is collected, the power values of the U phase and the W phase of the grid-connected port of the inverter are calculated and are respectively used as feedback values of the U phase power control loop and the W phase power control loop, the reference values of the U phase power control loop and the W phase power control loop are set to be zero, zero-power grid connection is achieved, and the closed-loop control of the U phase power control loop and the W phase power control loop is achieved through the PI controllers respectively.
8. The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 7, characterized in that: the output value of the PI controller is used as U-phase and W-phase two-phase current
Figure 588363DEST_PATH_IMAGE039
And
Figure 428143DEST_PATH_IMAGE040
reference value ofThe differential mode current reference value is
Figure 643224DEST_PATH_IMAGE039
-
Figure 607769DEST_PATH_IMAGE040
The common mode current reference value is
Figure 464867DEST_PATH_IMAGE039
+
Figure 893574DEST_PATH_IMAGE040
。
9. The grid-connected inverter anti-reflux control method for the 180-degree phase angle split-phase power grid according to claim 1, characterized in that: in step e, the method for obtaining the differential mode current feedback value and the common mode current feedback value comprises the following steps: and respectively obtaining U-phase and W-phase inductance current values of the grid-connected port of the inverter through current sampling, and respectively adding and subtracting the two-phase inductance current values to obtain an inductance current difference module value and an inductance current common module value which are respectively used as feedback values of differential mode current closed-loop control and common mode current control.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3656694B2 (en) * 1996-10-14 2005-06-08 富士電機ホールディングス株式会社 Power converter
CN104300896A (en) * 2014-11-18 2015-01-21 厦门科华恒盛股份有限公司 Photovoltaic inverter control device with backflow preventing function and control method thereof
CN108767901A (en) * 2018-06-28 2018-11-06 湖南科比特新能源科技股份有限公司 A kind of three-phase grid-connected inverter anti-backflow device and control method
CN110323955A (en) * 2019-06-14 2019-10-11 华为技术有限公司 A kind of off-network splits phase device and inverter system
CN111030499A (en) * 2019-12-28 2020-04-17 深圳鹏城新能科技有限公司 Split-phase inverter circuit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3656694B2 (en) * 1996-10-14 2005-06-08 富士電機ホールディングス株式会社 Power converter
CN104300896A (en) * 2014-11-18 2015-01-21 厦门科华恒盛股份有限公司 Photovoltaic inverter control device with backflow preventing function and control method thereof
CN108767901A (en) * 2018-06-28 2018-11-06 湖南科比特新能源科技股份有限公司 A kind of three-phase grid-connected inverter anti-backflow device and control method
CN110323955A (en) * 2019-06-14 2019-10-11 华为技术有限公司 A kind of off-network splits phase device and inverter system
CN111030499A (en) * 2019-12-28 2020-04-17 深圳鹏城新能科技有限公司 Split-phase inverter circuit

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