CN108233388B - Working mode control method and device of modular inverter - Google Patents
Working mode control method and device of modular inverter Download PDFInfo
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- CN108233388B CN108233388B CN201611152880.XA CN201611152880A CN108233388B CN 108233388 B CN108233388 B CN 108233388B CN 201611152880 A CN201611152880 A CN 201611152880A CN 108233388 B CN108233388 B CN 108233388B
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The embodiment of the invention provides a method and a device for controlling the working mode of a modular inverter. The modularized inverter comprises N inversion unit modules, wherein N is more than or equal to 2 and is an integer, and the method comprises the following steps: monitoring the output power of the modular inverter in real time, and judging whether a command for indicating that the set working mode requirement is met is received; and generating a control instruction for indicating the corresponding working modes of the N inversion unit modules according to the output power and the judgment result, and sending the control instruction to the modular inverter. By the method and the device for controlling the working mode of the modular inverter, the working mode of each inversion unit module can be flexibly configured, so that the modular inverter can be used as power generation equipment or reactive compensation equipment and can also be used as compatible equipment with coexistence of active power generation and reactive compensation.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a device for controlling the working mode of a modular inverter.
Background
Compared with the traditional inverter, the modular design of the inverter has the characteristics of higher reliability, maintainability, design flexibility and the like. FIG. 1 is a schematic view of a topology structure of a modular inverter in the prior art, and as shown in FIG. 1, the modular inverter is composed of n (n ≧ 2) inversion unit modules. Generally, an operation mode control method of an existing modular inverter is to control the modular inverter adopting the above topology structure, so that n inverter unit modules included in the modular inverter are configured to operate in an active power generation mode all in the daytime and in a Static Var Generator (SVG) operation mode all at night.
Therefore, the control mode cannot flexibly configure the working mode of each inversion unit module, so that the modular inverter cannot have a multi-purpose function, that is, the modular inverter cannot be used as power generation equipment or reactive compensation equipment and can also be used as compatible equipment with coexistence of active power generation and reactive compensation.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method and an apparatus for controlling a working mode of a modular inverter, so as to flexibly configure a working mode of each inverter unit module, so that the modular inverter can be used as both power generation equipment or reactive compensation equipment and compatible equipment with both active power generation and reactive compensation.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling an operating mode of a modular inverter, where the modular inverter includes N inverter unit modules, where N is greater than or equal to 2 and is an integer, and the method includes: monitoring the output power of the modular inverter in real time, and judging whether a command for indicating that the set working mode requirement is met is received; generating a control instruction for indicating the corresponding working modes of the N inversion unit modules according to the output power and the judgment result, and sending the control instruction to the modular inverter, wherein the working modes comprise at least one of the following modes: active power generation, active/reactive power generation, reactive compensation, standby and shutdown, wherein the active/reactive power generation refers to the simultaneous active power generation and reactive power generation according to a preset proportion.
The embodiment of the invention also provides a working mode control device of the modular inverter, the modular inverter comprises N inversion unit modules, wherein N is more than or equal to 2 and is an integer, and the device comprises: the power monitoring and command judging module is used for monitoring the output power of the modular inverter in real time and judging whether a command for indicating that the set working mode requirement is met is received or not; the instruction generating and sending module is configured to generate a control instruction for indicating a corresponding working mode of the N inverter unit modules according to the output power and the determination result, and send the control instruction to the modular inverter, where the working mode includes at least one of: active power generation, active/reactive power generation, reactive compensation, standby and shutdown, wherein the active/reactive power generation refers to the simultaneous active power generation and reactive power generation according to a preset proportion.
The method and the device for controlling the working mode of the modular inverter provided by the embodiment of the invention monitor the output power of the modular inverter consisting of N inversion unit modules in real time, judge whether a command for indicating that the set working mode requirement is met is received, further generate a control instruction for indicating the corresponding working mode of the N inversion unit modules according to the output power and the judgment result, and send the control instruction to the modular inverter. The working mode of each inversion unit module is flexibly configured, so that the modularized inverter can be used as power generation equipment or reactive compensation equipment and can also be used as compatible equipment with coexistence of active power generation and reactive compensation. And furthermore, the power station does not need to be separately configured with additional equipment, so that the cost is saved.
Drawings
FIG. 1 is a schematic of a prior art topology of a modular inverter; for convenience of understanding, the figure shows an inversion unit module, a direct current branch, a direct current bus and a box type transformer;
fig. 2 is a schematic flowchart of a method for controlling an operating mode of a modular inverter according to a first embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for controlling an operation mode of a modular inverter according to a second embodiment of the present invention;
fig. 4 is a flowchart illustrating the operation of the modular inverter according to the second embodiment of the present invention;
fig. 5 is a schematic structural diagram of an operation mode control device of a modular inverter according to a third embodiment of the present invention;
fig. 6 is another schematic structural diagram of an operation mode control device of a modular inverter according to a third embodiment of the present invention.
Detailed Description
The following describes a method and an apparatus for controlling an operating mode of a modular inverter according to an embodiment of the present invention in detail with reference to the accompanying drawings.
Example one
Fig. 2 is a flowchart illustrating a method for controlling an operation mode of a modular inverter according to a first embodiment of the present invention, which can be executed in a central control background, for example. With reference to fig. 1 and fig. 2, the modular inverter includes N inverter unit modules, where N is greater than or equal to 2 and is an integer, and the method for controlling the operating mode of the modular inverter includes:
step 210: the output power of the modular inverter is monitored in real time and it is determined whether a command is received indicating that the set operating mode requirement is met.
It should be noted that this operating mode control method is only for modular inverters in common dc bus conditions. With continued reference to fig. 1, m direct current branches (m is greater than or equal to 2) are converged into a direct current bus, and then the direct current is inverted into alternating current by the modular inverter and transmitted to the box-type transformer for grid-connected power generation.
In practical application, after a power station normally operates, the modular inverter operates according to the existing work flow, the central control background can monitor the output power of the module inverter in operation in real time, and judges whether a command for indicating that the set work mode requirement is met is received or not while monitoring the output power. For example, the command for indicating that the set operating mode requirement is met may be, for example, the N inverter unit modules generate active power and a small portion of reactive power, any inverter unit module is switched to be used as SVG, and the like.
The command is a command aiming at specific requirements of a power grid and an owner, and is manually issued through a human-computer interaction interface of a central control background. The specific requirement refers to unconventional requirements, such as limiting the active power, manually starting up and stopping, and the like, which are conventional requirements, and the specific requirement can be considered beyond the conventional requirements.
Step 220: and generating a control instruction for indicating the corresponding working modes of the N inversion unit modules according to the output power and the judgment result, and sending the control instruction to the modular inverter.
Here, the above operation mode may include, but is not limited to, at least one of: active power generation, active/reactive power generation, reactive compensation, standby and shutdown, wherein the active power generation is an operating mode characterized by a set power factor of 1, and the active/reactive power generation is an operating mode characterized by a set power factor of between-0.9 and 0.9. When the inversion unit module works in an active/reactive power generation working mode, the inversion unit module can generate a small amount of reactive power according to the set power factor.
That is to say, the output power of the modular inverter is taken into consideration comprehensively, whether a command issued according to specific requirements of the power grid and an owner is received or not is judged, a control instruction is generated and sent to the modular inverter, and the modular inverter configures the working modes of the N inverter unit modules according to the control instruction. Assuming that the control instruction indicates that the working mode of any one of the inverter unit modules is reactive compensation, after the modular inverter receives the control instruction, the inverter unit module with the shortest service time is selected according to the service time of each inverter unit module, and the working mode of the inverter unit module is set to be reactive compensation. The inverter unit module is selected as the SVG inverter unit module according to the use time, so that the effect of using the inverter unit module more uniformly can be achieved, and the phenomenon that one or more inverter unit modules are used for a long time is avoided.
In addition, when the determination result is that the issued command is not received, the central control background does not need to send any instruction to the modular inverter, and the modular inverter operates according to the existing workflow, which will be described in detail in the following embodiments, and details are not described here.
The working mode control method of the modular inverter provided by the invention is used for monitoring the output power of the modular inverter consisting of N inversion unit modules in real time, judging whether a command for indicating that the set working mode requirement is met is received or not, further generating a control instruction for indicating the corresponding working mode of the N inversion unit modules according to the output power and the judgment result, and sending the control instruction to the modular inverter. The working mode of each inversion unit module is flexibly configured, so that the modularized inverter can be used as power generation equipment or reactive compensation equipment and can also be used as compatible equipment with coexistence of active power generation and reactive compensation. And furthermore, the power station does not need to be separately configured with additional equipment, so that the cost is saved.
Example two
Fig. 3 is a schematic flow chart of a method for controlling an operation mode of a modular inverter according to a second embodiment of the present invention, which can be regarded as a specific implementation scheme of fig. 2.
Referring to fig. 3, step 310: the output power of the modular inverter is monitored in real time and it is determined whether a command is received indicating that the set operating mode requirement is met.
The content of the step 310 is the same as that of the step 210 in the first embodiment, and is not repeated herein.
The following steps 320 to 350 may be regarded as the refinement of step 220 in the first embodiment, and specifically, the following steps are as follows:
step 320: when the output power is in a set first power range and a command is received, generating one of the following control instructions: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; and the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation control instructions and sending the control instructions to the modular inverter.
Step 330: when the output power is in the set second power range and a command is received, generating one of the following control instructions: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation control instructions and sending the control instructions to the modularized inverter; and the power values in the set second power range are all smaller than the power values in the set first power range.
Fig. 4 is a flowchart illustrating an operation of a modular inverter according to a second embodiment of the present invention, and the steps 320 to 350 are described in detail with reference to fig. 4 and 3.
When the modular inverter operates according to the workflow shown in fig. 4, the central control background monitors the operation condition (especially the output power) of the modular inverter in real time.
At the moment, the central control background monitors that the output power of the modular inverter is in a set first power range. Here, assuming that the rated power of a single inverter unit module of the modular inverter is p, the power of the whole modular inverter is np, that is, the full power is np, and the normal generation high power condition can be considered as a power section between (n-1) p and 1.1np (the inverter usually requires 1.1 times of long term overload), that is, the above-mentioned set first power range.
And step 402, generating active power by all the N inverter unit modules.
The control backend executes step 320 in this embodiment when it is monitored that the output power of the modular inverter is in the power segment between (n-1) p to 1.1np and a command is received. If no command is received, no control instructions are sent to the modular inverter. Correspondingly, the modular inverter sets the operating modes of the N inverter unit modules included in the modular inverter to active power generation according to the existing work flow shown in fig. 4.
In step 403, the modular inverter is in a condition where active power begins to decrease.
Specifically, the modular inverter is in a condition that active power begins to decrease, that is, the central control background monitors that the output power of the modular inverter is in a set second power range, where the set second power range generally refers to a power section between (n-2) p and (n-1) p.
And step 404, switching out a certain inversion unit module for standby, and continuing to operate other inversion unit modules.
The control backend executes step 330 in this embodiment when it is monitored that the output power of the modular inverter is in the power segment between (n-2) p and (n-1) p and a command is received. If no command is received, no control instructions are sent to the modular inverter. Correspondingly, the modular inverter sets the operating mode of a certain inverter unit module to standby according to the existing work flow shown in fig. 4, and the operating modes of other inverter unit modules are still active power generation.
When the active power of the modular inverter continues to be reduced, the central control background monitors that the output power of the modular inverter is in a set third power range, wherein the set third power range generally refers to a power section between 0 and (n-2) p.
And 406, switching out a plurality of inversion unit modules for standby, and continuing to operate other inversion unit modules.
When the control backend monitors that the output power of the modular inverter is in the power segment between 0 and (n-2) p and receives a command, step 340 in this embodiment is executed. If no command is received, no control instructions are sent to the modular inverter. Correspondingly, the modular inverter sets the operating modes of the plurality of inverter unit modules to standby according to the existing work flow shown in fig. 4, and the operating modes of the other inverter unit modules are still active power generation.
The modularized inverter is in the condition of not generating power at night, namely the output power of the modularized inverter is monitored to be zero by the central control background.
And step 408, stopping all the N inversion unit modules.
When the control backend monitors that the output power of the modular inverter is zero and receives a command, step 350 in this embodiment is executed. If no command is received, no control instructions are sent to the modular inverter. Correspondingly, the modular inverter sets the operating modes of the N inverter unit modules included in the modular inverter to be shutdown according to the existing work flow shown in fig. 4.
On the basis of the above embodiment, the method for controlling the operating mode of the modular inverter of the present invention further has the following technical effects: and comprehensively considering the power range of the output power and whether a command of a specific requirement of a power grid and an owner is received, and generating a control command, wherein the control command enables the corresponding working modes of the N inversion unit modules to be the same or different. The working mode of each inversion unit module is flexibly configured, so that the modularized inverter can be used as power generation equipment or reactive compensation equipment and can also be used as compatible equipment with coexistence of active power generation and reactive compensation. Thereby achieving the function of one machine with multiple purposes.
EXAMPLE III
Fig. 5 is a schematic structural diagram of an operation mode control device of a modular inverter according to a third embodiment of the present invention. The method steps of the operating mode control of the modular inverter according to the first embodiment of the present invention can be performed.
Referring to fig. 5, the operation mode control apparatus of the modular inverter includes a power monitoring and command determining module 510 and a command generating and transmitting module 520.
The power monitoring and command determining module 510 is configured to monitor the output power of the modular inverter in real time, and determine whether a command indicating that the set operating mode requirement is met is received.
The instruction generating and sending module 520 is configured to generate a control instruction for instructing the N inverter unit modules to operate in corresponding modes according to the output power and the determination result, and send the control instruction to the modular inverter.
It should be noted that the operation mode may include at least one of the following: active power generation, active/reactive power generation, reactive compensation, standby and shutdown, but is not limited thereto. The active power generation can be an operation mode with a characteristic set power factor of 1, and the active/reactive power generation can be an operation mode with a characteristic set power factor of-0.9 to 0.9.
The working mode control device of the modular inverter monitors the output power of the modular inverter consisting of N inversion unit modules in real time, judges whether a command for indicating that the set working mode requirement is met is received or not, further generates a control instruction for indicating the corresponding working mode of the N inversion unit modules according to the output power and the judgment result, and sends the control instruction to the modular inverter. The working mode of each inversion unit module is flexibly configured, so that the modularized inverter can be used as power generation equipment or reactive compensation equipment and can also be used as compatible equipment with coexistence of active power generation and reactive compensation. And furthermore, the power station does not need to be separately configured with additional equipment, so that the cost is saved.
On the basis of the above embodiments, fig. 6 is another schematic structural diagram of an operation mode control device of a modular inverter according to a third embodiment of the present invention.
Referring to fig. 6, the instruction generating and sending module 520 may specifically include:
the first instruction generation unit 5201 is configured to, when the output power is in a set first power range and a command is received, generate one of the following control instructions: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; or/and the light source is arranged in the light path,
the second instruction generating unit 5202 is configured to generate one of the following control instructions when the output power is in the set second power range and a command is received: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; and the power values in the set second power range are all smaller than the power values in the set first power range.
Further, the instruction generating and sending module 520 may further include:
the third instruction generation unit 5203 is configured to, when the output power is in the set third power range and a command is received, generate one of the following control instructions: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; or/and the light source is arranged in the light path,
the fourth instruction generation unit 5204 is configured to, when the output power is zero and a command is received, generate one of the following control instructions: a control instruction for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are standby; control instructions for indicating that the working modes of the set number of the inverter unit modules are reactive compensation and the working modes of the remaining inverter unit modules are standby; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; the set third power range, the set second power range and the set first power range are three continuous power ranges obtained by dividing a power section between zero power and full power of the modular inverter.
Preferably, the working mode control device of the modular inverter can be integrated in the central control background, and the modular inverter is in communication connection with the working mode control device; alternatively, the operating mode control means are integrated in the controller of the modular inverter.
Compared with the prior art, the embodiment of the invention also has the following technical effects: on one hand, the power range of the output power is comprehensively considered, and whether a command of a specific requirement of a power grid and an owner is received or not is comprehensively considered, and a control command is generated, wherein the control command enables the corresponding working modes of the N inverter unit modules to be the same or different. The working mode of each inversion unit module is flexibly configured, so that the modularized inverter can be used as power generation equipment or reactive compensation equipment and can also be used as compatible equipment with coexistence of active power generation and reactive compensation. Thereby achieving the function of one machine with multiple purposes; on the other hand, the working mode control device of the modular inverter is integrated in the central control background or the controller of the modular inverter, so that the power station does not need to be separately configured with additional equipment, and the cost is saved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. A working mode control method of a modular inverter is disclosed, the modular inverter inverts direct current transmitted by a direct current bus converged by a plurality of direct current branches into alternating current and transmits the alternating current to a box transformer for grid-connected power generation, the modular inverter comprises N inversion unit modules, wherein N is not less than 2 and is an integer,
wherein the method comprises the following steps:
monitoring the output power of the modular inverter in real time, and judging whether a command for indicating that the set working mode requirement is met is received;
generating a control instruction for indicating the corresponding working modes of the N inversion unit modules according to the output power and the judgment result, and sending the control instruction to the modular inverter, wherein the working modes comprise at least one of the following modes: active power generation, active/reactive power generation, reactive compensation, standby and shutdown, wherein the active/reactive power generation refers to the simultaneous active power generation and reactive power generation according to a preset proportion,
wherein the method further comprises: reducing the number of the inversion unit modules in the active power generation operation mode when the output power is reduced under the condition that the N inversion unit modules are in the active power generation operation mode,
wherein the generating of the control instruction for indicating the corresponding working modes of the N inverter unit modules according to the output power and the determination result includes:
when the output power is in a set first power range and the command is received, generating one of the following control instructions: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation;
when the output power is in a set second power range and the command is received, generating one of the following control instructions: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; wherein the power values in the set second power range are all smaller than the power values in the set first power range;
when the output power is in a set third power range and the command is received, generating one of the following control instructions: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; the power values in the set third power range are all smaller than the power values in the set second power range, and the set third power range, the set second power range and the set first power range are three continuous power ranges obtained by dividing power sections between zero power and full power of the modular inverter.
2. The method according to claim 1, characterized in that the active power generation is an operating mode characterized by a set power factor of 1 and the active/reactive power generation is an operating mode characterized by a set power factor between-0.9 and 0.9.
3. The method according to any one of claims 1-2, wherein the generating control instructions for indicating the respective operating modes of the N inverter unit modules according to the output power and the determination result further comprises:
when the output power is zero and the command is received, generating one of the following control instructions:
a control instruction for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are standby;
control instructions for indicating that the working modes of the set number of the inverter unit modules are reactive compensation and the working modes of the remaining inverter unit modules are standby; and the number of the first and second groups,
and the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation.
4. A working mode control device of a modular inverter is disclosed, the modular inverter inverts direct current transmitted by a direct current bus converged by a plurality of direct current branches into alternating current and transmits the alternating current to a box transformer for grid-connected power generation, the modular inverter comprises N inversion unit modules, wherein N is not less than 2 and is an integer,
wherein the apparatus comprises:
the power monitoring and command judging module is used for monitoring the output power of the modular inverter in real time and judging whether a command for indicating that the set working mode requirement is met is received or not;
the instruction generating and sending module is used for generating control instructions for indicating the corresponding working modes of the N inversion unit modules according to the output power and the judgment result and sending the control instructions to the modularized inverter; the operating mode includes at least one of: active power generation, active/reactive power generation, reactive compensation, standby and shutdown, wherein the active/reactive power generation refers to the simultaneous active power generation and reactive power generation according to a preset proportion,
wherein the instruction generating and transmitting module further reduces the number of the inverter unit modules in the active power generation operation mode when the output power becomes smaller in a case where the N inverter unit modules are in the active power generation operation mode,
wherein, the instruction generating and sending module comprises:
a first instruction generating unit, configured to generate one of the following control instructions when the output power is in a set first power range and the command is received: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; or/and the light source is arranged in the light path,
a second instruction generating unit, configured to generate one of the following control instructions when the output power is in a set second power range and the command is received: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; wherein the power values in the set second power range are all smaller than the power values in the set first power range; or/and the light source is arranged in the light path,
a third instruction generating unit, configured to generate one of the following control instructions when the output power is in a set third power range and the command is received: the control instruction is used for indicating that the working modes of the N inversion unit modules are active/reactive power generation; the control instruction is used for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are active power generation; the control instruction is used for indicating that the working modes of the set number of the inversion unit modules are reactive compensation and the working modes of the rest inversion unit modules are active power generation; and the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation.
5. The apparatus of claim 4, wherein the instruction generation and transmission module further comprises:
a fourth instruction generating unit, configured to generate one of the following control instructions when the output power is zero and the command is received: a control instruction for indicating that the working mode of any one inversion unit module is reactive compensation and the working modes of the other inversion unit modules are standby; control instructions for indicating that the working modes of the set number of the inverter unit modules are reactive compensation and the working modes of the remaining inverter unit modules are standby; the control instruction is used for indicating that the working modes of the N inversion unit modules are reactive compensation; the power values in the set third power range are all smaller than the power values in the set second power range, and the set third power range, the set second power range and the set first power range are three continuous power ranges obtained by dividing power sections between zero power and full power of the modular inverter.
6. The device according to any one of claims 4-5, wherein the operation mode control device is integrated in a central control background, and the modular inverter is in communication connection with the operation mode control device; alternatively, the operation mode control means is integrated in a controller of the modular inverter.
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| CN202633939U (en) * | 2012-05-08 | 2012-12-26 | 吕遥 | DC LAN (Direct Current Local Area Network)-based distributed power generation system |
| CN203968055U (en) * | 2014-06-27 | 2014-11-26 | 国家电网公司 | A kind of modularization, centralized photovoltaic generation interface arrangement |
| CN104917181A (en) * | 2015-06-30 | 2015-09-16 | 华为技术有限公司 | Reactive and harmonic wave compensation method, device and system |
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| CN104779640B (en) * | 2015-04-15 | 2017-11-10 | 湖北追日电气股份有限公司 | Preventing distributed electricity generation system pours in down a chimney the system and control method of electrical power to power network |
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| CN202633939U (en) * | 2012-05-08 | 2012-12-26 | 吕遥 | DC LAN (Direct Current Local Area Network)-based distributed power generation system |
| CN203968055U (en) * | 2014-06-27 | 2014-11-26 | 国家电网公司 | A kind of modularization, centralized photovoltaic generation interface arrangement |
| CN104917181A (en) * | 2015-06-30 | 2015-09-16 | 华为技术有限公司 | Reactive and harmonic wave compensation method, device and system |
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