CN112787531A - Modular inversion system - Google Patents
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- CN112787531A CN112787531A CN202110113163.0A CN202110113163A CN112787531A CN 112787531 A CN112787531 A CN 112787531A CN 202110113163 A CN202110113163 A CN 202110113163A CN 112787531 A CN112787531 A CN 112787531A
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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
- 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
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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
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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
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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
- 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
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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 application provides a modularization contravariant system, includes: a plurality of parallelly connected contravariant module and with a plurality of the total control module of contravariant module communication, wherein, the contravariant module includes: the power unit is used for controlling power conversion from a direct current side to an alternating current side, and the main control unit is used for acquiring running state signals of the inversion module and controlling the running state of the inversion module based on the running state signals; the master control module is respectively communicated with the master control units in the plurality of inversion modules, receives the running state signals sent by the master control units, and sends control instructions for cooperatively controlling the running states of the plurality of inversion modules to the master control units. The power generation loss caused by the fault of the inverter system when the direct current power generation system is connected to the grid is reduced.
Description
Technical Field
The application relates to the technical field of power generation grid connection, in particular to a modular inversion system.
Background
An inverter is a power conversion device that converts direct current into alternating current, and is an important power conversion device in a direct current power generation system such as photovoltaic.
With the development of power electronic technology, the photovoltaic grid-connected inverter technology has developed more maturely, wherein most of the string-type photovoltaic inverters on the market currently adopt a circuit framework formed by a plurality of paths of MPPTs (direct current/direct current boost circuits) and a first-stage DC/AC inverter circuit, for string-type photovoltaic inverters with different power grades, in order to adapt to the current power grade, MPPT boost circuits with different paths can be configured, meanwhile, the later-stage DC/AC inverter needs to be designed for different power grades, and meanwhile, components with corresponding power grades need to be selected for a power loop on the inversion side to be matched. In practical situations, the power levels of the dc power generation system are various, and therefore, a corresponding inverter needs to be configured for each level, and when a certain device fails, the device needs to be shut down for replacement or maintenance, so that the fault tolerance is poor, and the power generation loss is large.
Therefore, how to reduce the power generation loss caused by the inverter system failure when the direct current power generation system is connected to the grid becomes a technical problem to be solved urgently.
Disclosure of Invention
The application provides a modularization inverter system to at least solve and exist among the correlation technique and how to reduce the technical problem of the power generation loss that brings because inverter system trouble when the direct current power generation system is incorporated into the power networks.
According to an aspect of an embodiment of the present application, there is provided a modular inversion system including: a plurality of parallelly connected contravariant module and with a plurality of the total control module of contravariant module communication, wherein, the contravariant module includes: the power unit is arranged between a direct current side and an alternating current side and used for controlling power conversion from the direct current side to the alternating current side, and the main control unit is respectively in communication connection with the power unit and the master control module and used for controlling the running state of the inversion module based on the collected running state signals of the power unit and sending the running state signals to the master control module; the master control module is respectively in communication connection with the master control units in the plurality of inversion modules and is used for sending control instructions for cooperatively controlling the running states of the plurality of inversion modules to the master control units.
Optionally, the power unit comprises: the transformer unit comprises one or more transformer circuits, the input end of each transformer circuit is connected with at least one independent direct current power supply, and when a plurality of transformer circuits are arranged in the transformer unit, the output ends of the transformer circuits are connected in parallel; and the inverter unit comprises an inverter circuit, the input end of the inverter circuit is connected with the output end of the transformation unit, and the output end of the inverter circuit is connected to a power grid.
Optionally, the operating state signal includes an input power of the inverter module; the main control unit is used for controlling the power unit to perform maximum power tracking based on the input power and a maximum power limiting value, and the maximum power limiting value is determined by the master control module based on the running state signals of the plurality of inversion modules.
Optionally, the main control unit is in communication with the master control module and configured to output a protection instruction based on fault feature data and the fault protection parameter threshold, where the protection instruction is configured to process a fault of the inverter module, the fault protection parameter threshold is determined by the master control module based on the plurality of operating state signals of the inverter module, and the fault feature data is determined by the main control unit based on the operating state signals.
Optionally, the main control unit is connected to a power grid and a direct current bus, receives a direct current bus electric energy parameter and a power grid electric energy parameter, and controls an inversion side grid-connected state of the inversion module based on the direct current bus electric energy parameter and the power grid electric energy parameter, wherein the direct current bus is formed by connecting in parallel based on outputs of voltage transformation units in the power units of the plurality of inversion modules.
Optionally, the main control unit is configured to control the power unit to operate based on an active power parameter and a reactive power parameter, where the active power parameter is determined by the main control unit based on the power grid power parameter, the reactive power parameter is determined by the main control unit based on a reactive control instruction, and the reactive control instruction is an instruction sent by the main control module to the main control unit, and the instruction is determined by the main control module based on the operating state signal of the plurality of inverter modules or determined based on a Q-U characteristic curve of a power grid.
Optionally, the master control unit is in communication with the master control module, and is configured to perform island disturbance control based on an island disturbance frequency value, where the island disturbance frequency value is determined by the master control module based on a voltage frequency of a power grid.
Optionally, the inverter module further includes a first auxiliary power source, which is respectively connected to the power unit and the main control unit, and is used for supplying power to the main control unit by taking power from the power unit.
Optionally, the modular inversion system further comprises: and the second auxiliary power supply is respectively connected with the inversion module and the master control module, and is used for supplying power to the master control module by taking power from the first auxiliary power supply in the inversion module and/or taking power from the alternating current side of the power unit.
Optionally, the modular inversion system further comprises: the common mode filtering unit is connected between the alternating current side of the power unit and a power grid; and the lightning protection unit is connected between the alternating current side of the power unit and a power grid.
In the embodiment of the application, the inversion modules are modularized, the inversion modules are communicated with all the inversion modules through the master control module, running state signals of all the inversion modules are received, the inversion modules are cooperatively controlled based on all the running state signals, power conversion from a direct current side to an inversion side is realized by power units in the inversion modules, the main control units correspond to the power units one by one, the running states of the power units are collected, the running states of the corresponding power units are controlled, data collection and running control functions of the inversion modules are distributed to the main control units, requirements of hardware resources and software resources of a main inverter controller are reduced, meanwhile, the circuit units are designed in a modularized mode, product lines with different powers share the inversion modules, material management and control are facilitated, batch production is facilitated, and manufacturing cost is reduced. The fault-tolerant capability is strong, when one inversion module breaks down, only a single module needs to be cut off, other modules in the system can still work normally, and the availability of the system is high. When the system fails, a certain power generation power can still be ensured, and higher power generation can be realized under the condition of the same failure rate as that of the traditional inverter.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic diagram of an alternative modular inversion system framework according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an alternative modular inversion system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a power unit in an alternative modular inversion system according to an embodiment of the present application;
FIG. 4 is a block diagram of inverter-side grid-connection control according to an embodiment of the present application;
fig. 5 is a schematic diagram of another alternative modular inversion system according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all 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 application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to an aspect of an embodiment of the present application, there is provided a modular inversion system, as shown in fig. 1, which may include: a plurality of inverter modules 10 connected in parallel and a general control module 20 communicating with a plurality of said inverter modules 10, wherein said inverter modules 10 comprise: the power conversion system comprises a power unit 11 and a main control unit 12, wherein the power unit 11 is used for controlling power conversion from a direct current side to an alternating current side, and the main control unit 12 is used for acquiring an operation state signal of the inverter module 10 and controlling an operation state of the inverter module 10 based on the operation state signal; the general control module 20 is respectively in communication with the main control unit 12 of the plurality of inverter modules 10, receives the operating state signal sent by the main control unit 12, and sends a control instruction for performing cooperative control on the operating states of the plurality of inverter modules 10 to the main control unit 12.
In the embodiment of the application, the inversion module 10 is modularized, and communicates with all inversion modules 10 through the master control module 20, receives the operation state signals of all inversion modules 10, and cooperatively controls the inversion modules 10 based on all the operation state signals, the power unit 11 in the inversion module 10 realizes the power conversion from the direct current side to the inversion side, the master control units 12 correspond to the power units 11 one by one, collects the operation states of the power units 11, controls the operation states of the corresponding power units 11, and distributes the data collection and operation control functions of the inversion modules 10 to a plurality of master control units 12, so as to reduce the requirements of hardware resources and software resources of the master inverter controller, and meanwhile, the circuit units are modularized, so that product lines with different powers share the inversion module 10, thereby facilitating material management and control and facilitating batch production, the manufacturing cost is reduced. The fault tolerance capability is strong, when one inversion module 10 breaks down, only a single module needs to be cut off, other modules in the system can still work normally, and the availability of the system is high. When the system fails, a certain power generation power can still be ensured, and higher power generation can be realized under the condition of the same failure rate as that of the traditional inverter.
As an illustrative example, as shown in fig. 2, a plurality of inverter modules 10 of a modular photovoltaic inverter system are independent of each other on the dc input side and are connected in parallel on the ac side. Each inverter module 10 can independently perform a dc-to-ac power conversion function. Among them, the power unit 11 may include: the transformer unit comprises one or more transformer circuits 111, the input end of each transformer circuit 111 is connected with at least one independent direct current power supply, and when the transformer unit is provided with a plurality of transformer circuits 111, the output ends of the transformer circuits 111 are connected in parallel; the inverter unit comprises an inverter circuit 112, an input end of the inverter circuit 112 is connected with an output end of the transformer unit, and an output end of the inverter circuit 112 is connected to a power grid, and an output end of the inverter circuit 112 is used for being connected to the power grid. For example, as shown in fig. 3, the transforming unit may be a step-up transforming circuit or a step-down transforming circuit, for example, a DC/DC circuit, which may include one DC/DC circuit or a plurality of DC/DC circuits; wherein, the input end of each DC/DC circuit can be connected with one or more photovoltaic strings or storage batteries, and when a plurality of DC/DC circuits exist, the output ends of the plurality of DC/DC circuits are connected in parallel to be used as the input end of the inversion unit.
As an exemplary embodiment, the operation status signals collected by the main control unit 12 may include: the voltage and current of the input photovoltaic array in each inversion module 10, the current of the DC/DC, the output voltage and current of each inversion module 10, the DC bus voltage, the radiator temperature of the inversion module 10, the grid voltage/frequency, and other signals, and calculate the corresponding data such as the voltage average value, the effective value, the current average value, the effective value, the power, and the like, for the operation control function and the protection function. And uploads the operating states to the general control module 20 through the communication module. For example, the communication between each main control unit 12 and the general control module 20 may be performed by using a communication module, for example, the communication line may be an RS485, an RS232 or a CAN bus, and all the communication modules in the main control units 12 and the general control module 20 may be connected to the communication bus at the same time. Communication lines such as SCI and SPI may also be used, and the communication modules in the main control unit 12 and the master control module 20 are respectively connected by corresponding communication lines such as SCI and SPI.
As an illustrative example, the main control unit 12 is configured to control the power unit 11 to perform maximum power tracking based on the input power and a maximum power limiting value, which is determined by the general control module 20 based on the operation status signals of the plurality of inverter modules 10. Specifically, the main control unit 12 is used for maximum power tracking of the corresponding DC/DC circuits. The maximum power tracking of each path of DC/DC can acquire information of input voltage and input current to calculate an input power value P, and before performing maximum power tracking each time, the maximum power limit value P of the inverter module 10 is updatedmaxThis value can be obtained by the main control unit 12 through the system operating conditions and the grid-connected power limiting command if the input power value P is largeIn PmaxThen the input voltage needs to be adjusted in the high direction, if the input power is less than PmaxAnd then normal MPPT disturbance tracking is carried out to obtain an input reference voltage, and closed-loop control of the input voltage is carried out after an input voltage reference instruction is obtained.
As an exemplary embodiment, the main control unit 12 is further configured to protect the corresponding inverter module 10, specifically, the main control unit 12 is further configured to determine fault feature data based on the operating state signal, and output a protection instruction based on the fault feature data and a fault protection parameter threshold, where the protection instruction is used to process a fault of the inverter module 10, and the fault protection parameter threshold is determined by the general control module 20 based on the operating state signals of the plurality of inverter modules 10. Illustratively, the main control unit 12 is configured to perform insulation resistance low protection, dc arc protection, leakage current protection, PV input reverse connection protection, input/output current overcurrent protection, ac side overvoltage/undervoltage/underfrequency protection, ac/dc side voltage overvoltage protection, and the like on the inverter module 10. Specifically, the method for the main control unit 12 to protect the inverter module 10 may be:
s1, obtaining physical quantities of protection signals, and carrying out data processing on the physical quantities to obtain fault characteristic data, such as maximum values and minimum values of the physical quantities of current, voltage, power and the like.
And S2, updating the threshold value of the fault protection parameter to obtain a set threshold value, and sending the threshold value to the main control unit through the communication of the main control module to perform timing update or triggering update. The threshold value of the fault protection parameter is related to the number of the currently operated inversion modules, so that the operation condition of each inversion module in the inversion system needs to be set and updated through the master control module.
And S3, judging whether the fault characteristic data exceed the corresponding set threshold, if not, returning to the step S1, and if so, entering the step S4.
And S4, judging whether the fault characteristic data exceeds a set threshold value, wherein the duration exceeds the threshold value, if not, returning to the step S1, and if so, entering the step S5.
And S5, carrying out fault processing on the current inversion module, and uploading the fault type to the master control module.
As an exemplary embodiment, the main control unit 12 is further configured to control a grid-connected state of an inverter side, specifically, the main control unit 12 is further configured to receive a dc bus power parameter and a grid power parameter, and control the grid-connected state of the inverter side of the inverter module 10 based on the dc bus power parameter and the grid power parameter, where the dc bus is formed based on parallel connection of outputs of voltage transformation units in the power units 11 of the plurality of inverter modules 10. Specifically, the main control unit 12 is configured to receive the electric energy parameter of the dc bus, and determine an active electric energy parameter based on the electric energy parameter of the power grid; the main control unit 12 is further configured to receive a reactive power control instruction, and determine a reactive power parameter based on the reactive power control instruction, where the reactive power control instruction is determined based on the operating state signals of the plurality of inverter modules 10 through the general control module 20, or is determined through a Q-U characteristic curve of a power grid; the main control unit 12 controls the power unit 11 to operate based on the active power parameter and the reactive power parameter.
Illustratively, the inverter side grid-connected control function mainly realizes control of bus voltage, control of an inverter start-stop machine, control of output active and reactive power, island disturbance control and the like. As shown in fig. 4, the output I of the dc bus voltage control loopdrefAs input reference value of active current control loop and input reference value I of reactive current control loopqrefGenerated by a reactive current control command calculation unit, the reactive command may be from the master control module 20, or may be obtained from a Q-U characteristic curve, or in a pure active control mode, the command is zero. The outputs of the active current control loop and the reactive current control loop are sent to a PWM generating unit to generate PWM drive, and the PWM drive is controlled by a start-stop instruction to output to the power unit 11, where the start-stop instruction can be from a start-stop instruction determined by the master control module 20 based on the operating state of each inverter module 10 in the system. The island disturbance frequency variation instruction delta f is sent to each main control unit 12 by the master control module 20 through communication to be updated, and is sent to the phase-locked loop control in each main control unit 12In the unit, a phase value θ of the system is obtained.
As an exemplary embodiment, the general control module 20 is used for collecting, displaying and communicating the operation signals of the respective inverter modules 10, wherein the display device may be an LED lamp, an LCD screen, or the like. In addition, in the power-limited operation mode, the general control module 20 monitors the output power of the whole system through the operation state signal obtained by the communication module, and sends corresponding active and reactive instructions to each unit module according to the power distribution strategy. The master control module 20 obtains the frequency of the three-phase output voltage through the communication module, calculates to obtain an island disturbance frequency value, and sends the island disturbance frequency value to each inverter module 10 through the communication module to control island disturbance. The general control module 20 can also communicate with external devices or cloud servers through the human-computer interface module in the manners of ethernet, bluetooth, RS485, WiFi, cellular network, power line carrier, etc. to transmit the monitoring data and control instructions of the operating state.
As an exemplary embodiment, as shown in fig. 2, the inverter module 10 further includes a first auxiliary power supply 13, which takes power through the power unit 11 and is used for supplying power to the main control unit 12. The inverter system further includes: and the second auxiliary power supply 30 is powered by the first auxiliary power supply 13 and/or is powered by the alternating current side of the power unit 11 and is used for supplying power to the general control module 20. As an exemplary embodiment, the first auxiliary power source 13 in each inverter module 10 draws power from the power unit 11, and may draw power from the DC bus or from the AC side of the subsequent DC/AC circuit, or both. One set of outputs of the first auxiliary power supply 13 provides power to the main control unit 12. The other set of outputs are connected in parallel through diodes to form the supply lines of the second auxiliary power supply 30.
As an exemplary embodiment, as shown in fig. 2, the modular inversion system may further include: the common mode filtering unit 40 is connected between the alternating current side of the power unit 11 and a power grid; and the lightning protection unit 50 is connected between the alternating current side of the power unit 11 and a power grid. Illustratively, the three-phase ac output of the inverter module 10 is connected in parallel outside the module, and then connected in series with a common mode filter unit and then connected to an external power grid, and a lightning protection unit is installed between a grid connection point between the common mode filter unit and the power grid and the ground. As shown in fig. 5, as another architecture embodiment, the common mode filtering unit 40 and the lightning protection unit 50 may be disposed in the power unit 11 of each inverter module 10, and disposed between the DC/AC output of each module unit and the power grid, and the common mode filtering unit 40 and the lightning protection unit 50 are not disposed outside the inverter module 10, which may be more beneficial to the modularization of the system.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. A modular inversion system, comprising: a plurality of parallel connected inversion modules and a master control module in communication with the plurality of inversion modules, wherein,
the inversion module includes: the power unit is arranged between a direct current side and an alternating current side and used for controlling power conversion from the direct current side to the alternating current side, and the main control unit is respectively in communication connection with the power unit and the master control module and used for controlling the running state of the inversion module based on the collected running state signals of the power unit and sending the running state signals to the master control module;
the master control module is respectively in communication connection with the master control units in the plurality of inversion modules and is used for sending control instructions for cooperatively controlling the running states of the plurality of inversion modules to the master control units.
2. The modular inversion system of claim 1, wherein the power unit comprises:
the transformer unit comprises one or more transformer circuits, the input end of each transformer circuit is connected with at least one independent direct current power supply, and when a plurality of transformer circuits are arranged in the transformer unit, the output ends of the transformer circuits are connected in parallel;
and the inverter unit comprises an inverter circuit, the input end of the inverter circuit is connected with the output end of the transformation unit, and the output end of the inverter circuit is connected to a power grid.
3. The modular inversion system of claim 1, wherein the operating condition signal includes an input power of the inversion module;
the main control unit is used for controlling the power unit to perform maximum power tracking based on the input power and a maximum power limiting value, and the maximum power limiting value is determined by the master control module based on the running state signals of the plurality of inversion modules.
4. The modular inversion system of claim 1,
the master control unit is communicated with the master control module and is used for outputting a protection instruction based on fault characteristic data and a fault protection parameter threshold, wherein the protection instruction is used for processing faults of the inversion modules, the fault protection parameter threshold is determined by the master control module based on the operation state signals of the plurality of inversion modules, and the fault characteristic data is determined by the master control unit based on the operation state signals.
5. The modular inversion system of claim 1, wherein the main control unit is connected to a grid and a dc bus, receives a dc bus power parameter and a grid power parameter, and controls an inversion-side grid-connected state of the inversion modules based on the dc bus power parameter and the grid power parameter, wherein the dc bus is formed in parallel based on outputs of voltage transformation units among the power units of the plurality of inversion modules.
6. The modular inversion system of claim 5,
the main control unit is used for controlling the power unit to operate based on an active electric energy parameter and a reactive electric energy parameter, wherein the active electric energy parameter is determined by the main control unit based on the electric energy parameter of the power grid, the reactive electric energy parameter is determined by the main control unit based on a reactive control instruction, and the reactive control instruction is an instruction which is sent to the main control unit by the main control module and is determined by the main control module based on the operation state signals of the plurality of inversion modules or determined by a Q-U characteristic curve of the power grid.
7. The modular inversion system of claim 5, wherein the master control unit is in communication with the master control module and is configured to perform island disturbance control based on an island disturbance frequency value, wherein the island disturbance frequency value is determined by the master control module based on a voltage frequency of a power grid.
8. The modular inversion system of claim 1,
the inversion module further comprises a first auxiliary power supply which is respectively connected with the power unit and the main control unit, and the power is obtained through the power unit and used for supplying power to the main control unit.
9. The modular inversion system of claim 8, further comprising:
and the second auxiliary power supply is respectively connected with the inversion module and the master control module, and is used for supplying power to the master control module by taking power from the first auxiliary power supply in the inversion module and/or taking power from the alternating current side of the power unit.
10. The modular inversion system of claim 1, further comprising:
the common mode filtering unit is connected between the alternating current side of the power unit and a power grid;
and the lightning protection unit is connected between the alternating current side of the power unit and a power grid.
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| CN202110113163.0A CN112787531A (en) | 2021-01-27 | 2021-01-27 | Modular inversion system |
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| WO2024015271A1 (en) * | 2022-07-11 | 2024-01-18 | Nextracker Llc | Parallel inverter systems and methods |
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| WO2024015271A1 (en) * | 2022-07-11 | 2024-01-18 | Nextracker Llc | Parallel inverter systems and methods |
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