CN112886805A - Parallel inversion topology control method and system - Google Patents

Parallel inversion topology control method and system Download PDF

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Publication number
CN112886805A
CN112886805A CN202110319976.5A CN202110319976A CN112886805A CN 112886805 A CN112886805 A CN 112886805A CN 202110319976 A CN202110319976 A CN 202110319976A CN 112886805 A CN112886805 A CN 112886805A
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voltage
slave
module
host
inversion
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CN112886805B (en
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胡斌
黄凯伦
林镇煌
吴佰桐
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Xiamen Kehua Digital Energy Tech Co Ltd
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Zhangzhou Kehua Technology Co Ltd
Kehua Data Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention provides a parallel inversion topology control method and a system, wherein the method comprises the following steps: the host control module determines phase information between the host modulation voltage and the power grid voltage based on the pre-calculated host modulation voltage, and sends the phase information and the pre-acquired power grid voltage to the slave control module; the host control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates a pre-calculated host modulation voltage according to the zero sequence voltage, and controls the main inverter module based on the updated host modulation voltage; the slave control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates a pre-calculated slave modulation voltage according to the zero sequence voltage, and controls the slave inverter module based on the updated slave modulation voltage. The invention can effectively inhibit zero-sequence circulating current generated by parallel connection of all the inverter modules.

Description

Parallel inversion topology control method and system
Technical Field
The invention belongs to the technical field of inversion control, and particularly relates to a parallel inversion topology control method and system.
Background
Parallel connection of modules is a common way to increase the single-machine capacity of power electronic equipment. For example, the parallel inversion topology is formed by connecting a plurality of inverters in parallel, the inverters can realize high-capacity power supply in parallel operation, the flexibility of the system can be greatly improved, and the volume and the weight of the power supply system are greatly reduced.
In the existing parallel inverter topology, each module of the system is controlled by an independent inverter system, and is influenced by factors such as analog quantity sampling errors and power inequality among modules, and zero sequence voltages calculated by a control system of each module are different. For a system with alternating current and direct current connected in parallel, the difference of zero sequence voltage between modules is an important factor for causing zero sequence circulating current between inversion modules.
Therefore, how to inhibit the zero-sequence circulating current of the parallel inverter module becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a parallel inversion topology control method and a parallel inversion topology control system, which aim to solve the technical problem of how to inhibit zero-sequence circulating current of parallel inversion modules in the prior art.
In order to achieve the above object, the present invention adopts a technical solution of providing a parallel inversion topology control method, where the method is applied to control modules corresponding to a parallel inversion topology, and the parallel inversion topology includes a master inversion module and at least one slave inversion module; the main inversion module is connected with the direct current side of the slave inversion module in parallel, and the main inversion module is connected with the alternating current side of the slave inversion module in parallel; the method comprises the following steps:
the host control module determines phase information between the host modulation voltage and the power grid voltage based on the pre-calculated host modulation voltage, and sends the phase information and the pre-acquired power grid voltage to the slave control module; the master control module is a control module corresponding to the master inversion module, and the slave control module is a control module corresponding to the slave inversion module;
the host control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates a pre-calculated host modulation voltage according to the zero sequence voltage, and controls the main inverter module based on the updated host modulation voltage;
the slave control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates a pre-calculated slave modulation voltage according to the zero sequence voltage, and controls the slave inverter module based on the updated slave modulation voltage.
Optionally, the phase information is a tangent value of a phase difference between the host modulation voltage and the grid voltage; the determining phase information between the host modulation voltage and the grid voltage based on the pre-calculated host modulation voltage includes:
and determining the tangent value of the phase difference between the host modulation voltage and the power grid voltage based on the d-axis component and the q-axis component corresponding to the host modulation voltage.
Optionally, the method for calculating the modulation voltage of the host includes:
acquiring a direct current bus voltage corresponding to a main inversion module, and determining a current reference value corresponding to the main inversion module according to the direct current bus voltage corresponding to the main inversion module and a preset host reference voltage;
and acquiring output current corresponding to the main inversion module, and determining host modulation voltage corresponding to the main inversion module according to the current reference value corresponding to the main inversion module and the output current corresponding to the main inversion module.
Optionally, the method for calculating the slave modulation voltage includes:
acquiring direct-current bus voltage corresponding to the slave inverter module, and determining a current reference value corresponding to the slave inverter module according to the direct-current bus voltage corresponding to the slave inverter module and preset slave reference voltage;
and acquiring output current corresponding to the slave inverter module, and determining slave modulation voltage corresponding to the slave inverter module according to the current reference value corresponding to the slave inverter module and the output current corresponding to the slave inverter module.
Optionally, the determining the zero sequence voltage according to the phase information and the grid voltage includes:
determining a zero sequence q-axis component according to the effective value of the power grid voltage and the phase information;
determining a zero-sequence three-phase modulation voltage based on the zero-sequence q-axis component and the effective value of the power grid voltage;
and determining zero sequence voltage based on the zero sequence three-phase modulation voltage.
Optionally, the determining the zero-sequence q-axis component according to the effective value of the grid voltage and the phase information includes:
and taking the product of the effective value of the power grid voltage and the phase information as a zero sequence q-axis component.
Optionally, the determining the zero-sequence three-phase modulation voltage based on the zero-sequence q-axis component and the effective value of the grid voltage includes:
and converting the zero sequence q-axis component and the effective value of the power grid voltage from a dq coordinate system to an abc coordinate system to obtain a zero sequence three-phase modulation voltage.
Optionally, the determining the zero-sequence voltage based on the zero-sequence three-phase modulation voltage includes:
V0＝0.5*[max(Va0,Vb0,Vc0)+min(Va0,Vb0,Vc0)]
wherein, V0Is zero sequence voltage, Va0、Vb0、Vc0Respectively zero sequence three-phase modulation voltage.
Optionally, the updating the pre-calculated host modulation voltage according to the zero sequence voltage includes:
and taking the difference between the pre-calculated host modulation voltage and the zero sequence voltage as the updated host modulation voltage.
In order to achieve the above object, the present invention further provides a parallel inversion topology control system, which is applied to a parallel inversion topology, wherein the parallel inversion topology includes a master inversion module and at least one slave inversion module; the main inversion module is connected with the direct current side of the slave inversion module in parallel, and the main inversion module is connected with the alternating current side of the slave inversion module in parallel; the system comprises:
the system comprises a host control module and at least one slave control module in communication connection with the host control module, wherein the slave control modules correspond to slave inverter modules one to one;
the host control module is used for determining phase information between the host modulation voltage and the power grid voltage based on the pre-calculated host modulation voltage and sending the phase information and the pre-acquired power grid voltage to the slave control module;
the main machine control module is also used for determining a zero sequence voltage according to the phase information and the power grid voltage, updating a pre-calculated main machine modulation voltage according to the zero sequence voltage, and controlling the main inversion module based on the updated main machine modulation voltage;
and the slave control module is used for determining a zero sequence voltage according to the phase information and the power grid voltage, updating a pre-calculated slave modulation voltage according to the zero sequence voltage, and controlling the slave inverter module based on the updated slave modulation voltage.
The parallel inversion topology control method and the system provided by the invention have the beneficial effects that:
different from the prior art, the invention adopts a master-slave control mode, the master control module sends phase information required for calculating zero sequence voltage and power grid voltage to each slave control module, and the master control module and the slave control modules calculate the zero sequence voltage according to the phase information and the power grid voltage, thereby ensuring the consistency of the zero sequence voltage and effectively inhibiting zero sequence circulating current between each parallel inverter module. On the basis, because the invention only sends the phase information and the power grid voltage to the slave control module, but not directly makes the modulation voltage of each inversion module completely consistent, the influence of the difference of the filter inductance/capacitance of each inversion module on the control can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a parallel inversion topology control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a parallel inversion topology control system according to an embodiment of the present invention;
fig. 3 is a control schematic diagram of a host control module according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a parallel inversion topology control method according to an embodiment of the present invention, where the parallel inversion topology control method is applied to control modules corresponding to a parallel inversion topology, and the parallel inversion topology includes a master inversion module and at least one slave inversion module. The main inversion module is connected with the direct current side of the slave inversion module in parallel, and the main inversion module is connected with the alternating current side of the slave inversion module in parallel.
The main inversion module can be selected randomly, other inversion modules can be selected as slave inversion modules, and the main inversion module can be selected according to actual requirements.
The parallel inversion topology control method comprises the following steps:
s101: the master control module determines phase information between the master modulation voltage and the grid voltage based on the pre-calculated master modulation voltage, and sends the phase information and the pre-acquired grid voltage to the slave control module. The master control module is a control module corresponding to the master inversion module, and the slave control module is a control module corresponding to the slave inversion module.
S102: the main machine control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates a pre-calculated main machine modulation voltage according to the zero sequence voltage, and controls the main inversion module based on the updated main machine modulation voltage.
S103: and the slave control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates the pre-calculated slave modulation voltage according to the zero sequence voltage, and controls the slave inverter module based on the updated slave modulation voltage.
In this embodiment, the master control module is in communication connection with at least one slave control module, so that the master control module can send information (phase information and grid voltage) required for calculating the zero-sequence voltage to the slave control module in a communication manner, thereby ensuring the consistency of the zero-sequence voltage between the parallel inverter modules.
In this embodiment, updating the master modulation voltage/the slave modulation voltage refers to injecting zero sequence voltage into the master modulation wave/the slave modulation wave, so as to form an updated master modulation wave/slave modulation wave (i.e., an updated master modulation voltage or slave modulation voltage), so as to achieve the same control effect as the SVPWM modulation method by means of carrier modulation.
In this embodiment, the control of the main inverter module based on the updated main machine modulation voltage refers to the control of the switching tube of the main inverter module based on the updated main machine modulation voltage (in the form of modulation wave). Correspondingly, the control of the slave inverter module based on the updated slave modulation voltage refers to the control of the switching tube of the slave inverter module based on the updated slave modulation voltage (in the form of modulation wave).
In this embodiment, only the phase information and the grid voltage are sent to the slave control module by the master control module, so that the utilization rate of the communication bus can be effectively reduced.
As can be seen from the above description, different from the prior art, the embodiment of the present invention adopts a master-slave control mode, the master control module sends phase information required for calculating the zero-sequence voltage and the grid voltage to each slave control module, and the master control module and the slave control modules calculate the zero-sequence voltage according to the phase information and the grid voltage, so as to ensure consistency of the zero-sequence voltage and effectively suppress zero-sequence circulating currents between each parallel inverter module. On the basis, because the embodiment of the invention only sends the phase information and the power grid voltage to the slave control module, but not directly makes the modulation voltage of each inversion module completely consistent, the influence of the difference of the filter inductance/capacitance of each inversion module on the control can be effectively reduced.
Optionally, as a specific implementation manner of the parallel inversion topology control method provided in the embodiment of the present invention, reference may be made to fig. 3, where fig. 3 is a schematic control diagram of a host control module provided in the embodiment of the present invention. The phase information may be a tangent value of a phase difference between the host modulation voltage and the grid voltage (corresponding to tan (α) in fig. 3). Determining phase information between the host modulation voltage and the grid voltage based on the pre-calculated host modulation voltage, comprising:
d-axis component U corresponding to modulation voltage based on hostm_dAnd q-axis component Um_qThe tangent tan (α) of the phase difference between the host modulation voltage and the grid voltage is determined.
In the present embodiment, the d-axis component U corresponding to the modulation voltage based on the host computerm_dAnd q-axis component Um_qBefore calculating the tangent tan (alpha) of the phase difference between the host modulation voltage and the grid voltage, the d-axis component U corresponding to the host modulation voltage can be respectively calculatedm_dAnd q-axis component Um_qA low-pass filtering process (corresponding to the LPF in fig. 3) is performed.
In this embodiment, the host modulation voltage (three-phase form) may be calculated first, and then the d-axis component and the q-axis component corresponding to the host modulation voltage may be obtained by means of abc/dq coordinate system transformation (i.e., transformation from a three-phase stationary abc coordinate system to a two-phase rotating dq coordinate system).
In this embodiment, the d-axis component U corresponding to the modulation voltage of the host can be based onm_dAnd q-axis component Um_qCalculates the tangent tan (α) of the phase difference between the host modulation voltage and the grid voltage.
Optionally, as a specific implementation manner of the parallel inversion topology control method provided in the embodiment of the present invention, the method for calculating the modulation voltage of the host includes:
and acquiring the direct current bus voltage corresponding to the main inversion module, and determining a current reference value corresponding to the main inversion module according to the direct current bus voltage corresponding to the main inversion module and a preset host reference voltage.
And acquiring output current corresponding to the main inversion module, and determining host modulation voltage corresponding to the main inversion module according to the current reference value corresponding to the main inversion module and the output current corresponding to the main inversion module.
In this embodiment, the host modulation voltage may be calculated based on the bus voltage loop and the inductance current loop of the host control module.
Optionally, as a specific implementation manner of the parallel inversion topology control method provided in the embodiment of the present invention, the method for calculating the slave modulation voltage includes:
and acquiring the direct current bus voltage corresponding to the slave inverter module, and determining the current reference value corresponding to the slave inverter module according to the direct current bus voltage corresponding to the slave inverter module and the preset slave reference voltage.
And acquiring output current corresponding to the slave inverter module, and determining slave modulation voltage corresponding to the slave inverter module according to the current reference value corresponding to the slave inverter module and the output current corresponding to the slave inverter module.
In this embodiment, the slave modulation voltage may be calculated based on the bus voltage loop and the inductor current loop of the slave control module.
That is to say, the host modulation voltage is calculated based on the independent control loop of the host control module, the slave modulation voltage is calculated based on the independent control loop of the slave control module, and each inverter module has a corresponding current loop, so that the influence of the difference of the filter inductance/capacitance of each inverter module on the control can be effectively reduced.
Optionally, referring to fig. 3, as a specific implementation manner of the parallel inversion topology control method provided in the embodiment of the present invention, determining the zero-sequence voltage according to the phase information and the grid voltage includes:
according to the effective value U of the network voltagegridAnd determining a zero sequence q-axis component by the phase information tan (alpha).
And determining the zero-sequence three-phase modulation voltage based on the zero-sequence q-axis component and the effective value of the power grid voltage.
And determining zero sequence voltage based on the zero sequence three-phase modulation voltage.
In this embodiment, the effective value U of the grid voltage can be determinedgridTaking the product of the phase information tan (alpha) as a zero sequence q-axis component Uq0。
In this embodiment, the q-axis component U may be zero-sequence componentq0And the effective value U of the network voltagegrid(namely, the effective value of the grid voltage is used as the zero sequence d-axis component) is converted from the dq coordinate system to the abc coordinate system to obtain the zero sequence three-phase modulation voltage (V)a0,Vb0,Vc0)。
Optionally, as a specific implementation manner of the parallel inversion topology control method provided in the embodiment of the present invention, determining the zero-sequence voltage based on the zero-sequence three-phase modulation voltage includes:
V0＝0.5*[max(Va0,Vb0,Vc0)+min(Va0,Vb0,Vc0)]
wherein, V0Is zero sequence voltage, Va0、Vb0、Vc0Respectively zero sequence three-phase modulation voltage.
Optionally, please refer to fig. 3, in fig. 3, Vx_oriFor pre-calculated host modulation voltage, VxModulating voltage for the updated host, wherein x is a, b or c, as parallel inversion topology control provided by the embodiment of the inventionOne embodiment of the method for updating the pre-calculated host modulation voltage according to the zero sequence voltage includes:
modulating voltage V of host computer calculated in advancex_oriAnd zero sequence voltage V0Is used as the updated host modulation voltage Vx。
The process of calculating the zero sequence voltage by the slave control module and updating the pre-calculated slave modulation voltage based on the zero sequence voltage is the same as that of the master control module, and is not described herein again.
To achieve the above object, referring to fig. 2, the present invention further provides a parallel inversion topology control system 20, where the system 20 is applied to a parallel inversion topology, and the parallel inversion topology includes a master inversion module and at least one slave inversion module. The main inversion module is connected with the direct current side of the slave inversion module in parallel, and the main inversion module is connected with the alternating current side of the slave inversion module in parallel. The system 20 includes:
the system comprises a host control module 21 and at least one slave control module 22 in communication connection with the host control module 21, wherein the slave control modules 22 correspond to slave inverter modules one to one.
The master control module 21 is configured to determine phase information between the master modulation voltage and the grid voltage based on the pre-calculated master modulation voltage, and send the phase information and the pre-obtained grid voltage to the slave control module.
The host control module 21 is further configured to determine a zero-sequence voltage according to the phase information and the grid voltage, update a pre-calculated host modulation voltage according to the zero-sequence voltage, and control the host inverter module based on the updated host modulation voltage.
The slave control module 22 is configured to determine a zero sequence voltage according to the phase information and the grid voltage, update a pre-calculated slave modulation voltage according to the zero sequence voltage, and control the slave inverter module based on the updated slave modulation voltage.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, the phase information is a tangent value of a phase difference between the host modulation voltage and the grid voltage. Determining phase information between the host modulation voltage and the grid voltage based on the pre-calculated host modulation voltage, comprising:
and determining the tangent value of the phase difference between the host modulation voltage and the power grid voltage based on the d-axis component and the q-axis component corresponding to the host modulation voltage.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, the method for calculating the modulation voltage of the host includes:
and acquiring the direct current bus voltage corresponding to the main inversion module, and determining a current reference value corresponding to the main inversion module according to the direct current bus voltage corresponding to the main inversion module and a preset host reference voltage.
And acquiring output current corresponding to the main inversion module, and determining host modulation voltage corresponding to the main inversion module according to the current reference value corresponding to the main inversion module and the output current corresponding to the main inversion module.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, the method for calculating the slave modulation voltage includes:
and acquiring the direct current bus voltage corresponding to the slave inverter module, and determining the current reference value corresponding to the slave inverter module according to the direct current bus voltage corresponding to the slave inverter module and the preset slave reference voltage.
And acquiring output current corresponding to the slave inverter module, and determining slave modulation voltage corresponding to the slave inverter module according to the current reference value corresponding to the slave inverter module and the output current corresponding to the slave inverter module.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, determining the zero-sequence voltage according to the phase information and the grid voltage includes:
and determining a zero sequence q-axis component according to the effective value and the phase information of the grid voltage.
And determining the zero-sequence three-phase modulation voltage based on the zero-sequence q-axis component and the effective value of the power grid voltage.
And determining zero sequence voltage based on the zero sequence three-phase modulation voltage.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, determining the zero-sequence q-axis component according to the effective value and the phase information of the grid voltage includes:
and taking the product of the effective value and the phase information of the power grid voltage as a zero sequence q-axis component.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, determining the zero-sequence three-phase modulation voltage based on the zero-sequence q-axis component and the effective value of the grid voltage includes:
and converting the zero-sequence q-axis component and the effective value of the power grid voltage from the dq coordinate system to the abc coordinate system to obtain the zero-sequence three-phase modulation voltage.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, the determining the zero-sequence voltage based on the zero-sequence three-phase modulation voltage includes:
V0＝0.5*[max(Va0,Vb0,Vc0)+min(Va0,Vb0,Vc0)]
wherein, V0Is zero sequence voltage, Va0、Vb0、Vc0Respectively zero sequence three-phase modulation voltage.
Optionally, as a specific implementation manner of the parallel inversion topology control system provided in the embodiment of the present invention, the updating the pre-calculated host modulation voltage according to the zero sequence voltage includes:
and taking the difference between the pre-calculated host modulation voltage and the zero sequence voltage as the updated host modulation voltage.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A parallel inversion topology control method is applied to control modules corresponding to a parallel inversion topology, and the parallel inversion topology comprises a main inversion module and at least one slave inversion module; the main inversion module is connected with the direct current side of the slave inversion module in parallel, and the main inversion module is connected with the alternating current side of the slave inversion module in parallel; the method comprises the following steps:
the host control module determines phase information between the host modulation voltage and the power grid voltage based on the pre-calculated host modulation voltage, and sends the phase information and the pre-acquired power grid voltage to the slave control module; the master control module is a control module corresponding to the master inversion module, and the slave control module is a control module corresponding to the slave inversion module;
the host control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates a pre-calculated host modulation voltage according to the zero sequence voltage, and controls the main inverter module based on the updated host modulation voltage;
the slave control module determines a zero sequence voltage according to the phase information and the power grid voltage, updates a pre-calculated slave modulation voltage according to the zero sequence voltage, and controls the slave inverter module based on the updated slave modulation voltage.
2. The parallel inversion topology control method of claim 1, wherein the phase information is a tangent value of a phase difference between a host modulation voltage and a grid voltage; the determining phase information between the host modulation voltage and the grid voltage based on the pre-calculated host modulation voltage includes:
and determining the tangent value of the phase difference between the host modulation voltage and the power grid voltage based on the d-axis component and the q-axis component corresponding to the host modulation voltage.
3. The parallel inversion topology control method of claim 1, wherein the method of calculating the host modulation voltage is:
acquiring a direct current bus voltage corresponding to a main inversion module, and determining a current reference value corresponding to the main inversion module according to the direct current bus voltage corresponding to the main inversion module and a preset host reference voltage;
and acquiring output current corresponding to the main inversion module, and determining host modulation voltage corresponding to the main inversion module according to the current reference value corresponding to the main inversion module and the output current corresponding to the main inversion module.
4. The parallel inversion topology control method of claim 1, wherein the method of calculating the slave modulation voltage is:
acquiring direct-current bus voltage corresponding to the slave inverter module, and determining a current reference value corresponding to the slave inverter module according to the direct-current bus voltage corresponding to the slave inverter module and preset slave reference voltage;
and acquiring output current corresponding to the slave inverter module, and determining slave modulation voltage corresponding to the slave inverter module according to the current reference value corresponding to the slave inverter module and the output current corresponding to the slave inverter module.
5. The parallel inversion topology control method of claim 1, wherein the determining a zero sequence voltage from the phase information and the grid voltage comprises:
determining a zero sequence q-axis component according to the effective value of the power grid voltage and the phase information;
determining a zero-sequence three-phase modulation voltage based on the zero-sequence q-axis component and the effective value of the power grid voltage;
and determining zero sequence voltage based on the zero sequence three-phase modulation voltage.
6. The parallel inversion topology control method according to claim 5, wherein the determining the zero sequence q-axis component according to the effective value of the grid voltage and the phase information includes:
and taking the product of the effective value of the power grid voltage and the phase information as a zero sequence q-axis component.
7. The parallel inversion topology control method of claim 5, wherein the determining a zero sequence three phase modulation voltage based on the zero sequence q-axis component and the effective value of the grid voltage comprises:
and converting the zero sequence q-axis component and the effective value of the power grid voltage from a dq coordinate system to an abc coordinate system to obtain a zero sequence three-phase modulation voltage.
8. The parallel inversion topology control method of claim 5, wherein the determining a zero sequence voltage based on the zero sequence three phase modulation voltage comprises:
V0＝0.5*[max(Va0,Vb0,Vc0)+min(Va0,Vb0,Vc0)]
wherein, V0Is zero sequence voltage, Va0、Vb0、Vc0Respectively zero sequence three-phase modulation voltage.
9. The parallel inversion topology control method according to any one of claims 1 to 8, wherein the updating the pre-calculated host modulation voltage according to the zero sequence voltage comprises:
and taking the difference between the pre-calculated host modulation voltage and the zero sequence voltage as the updated host modulation voltage.
10. A parallel inversion topology control system is characterized in that the system is applied to a parallel inversion topology, and the parallel inversion topology comprises a main inversion module and at least one slave inversion module; the main inversion module is connected with the direct current side of the slave inversion module in parallel, and the main inversion module is connected with the alternating current side of the slave inversion module in parallel; the system comprises:
the system comprises a host control module and at least one slave control module in communication connection with the host control module, wherein the slave control modules correspond to slave inverter modules one to one;
the host control module is used for determining phase information between the host modulation voltage and the power grid voltage based on the pre-calculated host modulation voltage and sending the phase information and the pre-acquired power grid voltage to the slave control module;
the main machine control module is also used for determining a zero sequence voltage according to the phase information and the power grid voltage, updating a pre-calculated main machine modulation voltage according to the zero sequence voltage, and controlling the main inversion module based on the updated main machine modulation voltage;
and the slave control module is used for determining a zero sequence voltage according to the phase information and the power grid voltage, updating a pre-calculated slave modulation voltage according to the zero sequence voltage, and controlling the slave inverter module based on the updated slave modulation voltage.
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