CN108288921A - A kind of cascaded inverter control system and control method - Google Patents
A kind of cascaded inverter control system and control method Download PDFInfo
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- CN108288921A CN108288921A CN201810063812.9A CN201810063812A CN108288921A CN 108288921 A CN108288921 A CN 108288921A CN 201810063812 A CN201810063812 A CN 201810063812A CN 108288921 A CN108288921 A CN 108288921A
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/1895—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast for short real-time information, e.g. alarms, notifications, alerts, updates
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/4013—Management of data rate on the bus
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Inverter Devices (AREA)
Abstract
This application discloses a kind of cascaded inverter control system and control method, which is the broadcast type network that the slave controller being arranged in a one-to-one correspondence by master controller and with each inversion unit is constituted；In each communication cycle, master controller and bus is respectively occupied successively from controller；Change rate is sent to less than the Data Concurrent of threshold value in bus in the operation data of master controller acquisition AC load；Change rate is sent to less than the Data Concurrent of the threshold value in bus from the operation data that controller acquires corresponding inversion unit, obtain the data transmitted in bus, according to data that are itself acquisition and being transmitted in bus, calculate modulation voltage, modulation degree and the duty ratio of corresponding inversion unit, pwm signal is generated, the electronic power switch in corresponding inversion unit is driven.The application reduces the requirement to traffic rate and baud rate under the premise of ensureing control performance and constant bandwidth, and improves system stability and robustness.
Description
Technical field
The present invention relates to fields of communication technology, more specifically to a kind of cascaded inverter control system and control
Method.
Background technology
Fig. 1 shows a kind of cascaded inverter, which includes multiple inversion units, each inversion unit
Outlet side be in series after access AC load, input side connects independent DC source.
In the control to cascaded inverter, a kind of existing way be using a master controller and with each inversion
The slave controller that unit is arranged in a one-to-one correspondence constitutes broadcast type network.Wherein, master controller acquisition AC load and each inversion
The operation data of unit calculates modulation voltage, modulation degree and the very high data of duty ratio Equal variation of each inversion unit,
Then it is sent on communication bus in the form of broadcast, respectively from controller obtains the data transmitted on the communication bus and according to this
A little data generate pwm signal, drive the electronic power switch in corresponding inversion unit.
But as inversion unit quantity increases, the amount for the very high data of the change rate to be sent in broadcast type network
It is increasing, in the case where bandwidth is constant, in order to ensure control performance, it is desirable that the traffic rate and baud rate reached is got over
Greatly, communications cost can also increase therewith.Moreover, also to take certain measure to avoid or cope with the very high number of the change rate
According to occurring situations such as error code, packet loss in transmission process, system stability and robustness are poor.
Invention content
In view of this, a kind of cascaded inverter control system of present invention offer and control method, are ensureing to control to realize
The requirement to traffic rate and baud rate is reduced under the premise of performance and bandwidth processed are constant, and improves system stability and robust
Property.
A kind of cascaded inverter control system, the cascaded inverter control system be by master controller and with it is each inverse
Become the broadcast type network that the slave controller that unit is arranged in a one-to-one correspondence is constituted；
In each communication cycle, the master controller and communication bus is respectively occupied successively from controller；
The master controller, change rate is less than the data of threshold value in the operation data for acquiring AC load, and with wide
The form broadcast is sent on the communication bus；
It is described from controller, in the operation data for acquiring itself corresponding inversion unit change rate be less than the threshold value
Data, and be sent on the communication bus in the form of broadcast；The data transmitted on the communication bus are obtained, according to certainly
The data transmitted on body acquisition the and described communication bus, calculate modulation voltage, the modulation degree of itself corresponding inversion unit
And duty ratio, pwm signal is generated, the electronic power switch in itself corresponding inversion unit is driven.
The master controller and from controller be respectively the node in the broadcast type network；
Optionally, each node is additionally operable to when judging that abnormal conditions occur in the data for obtaining itself acquisition, in a upper section
Point terminates to start before occupying the communication bus occupancy of the communication bus, next minor node, will be in the form of broadcast
The relevant warning information of abnormal conditions is sent on the communication bus.
Optionally, change rate includes less than the data of threshold value in the operation data of the AC load：Grid voltage amplitude；
Change rate includes less than the data of the threshold value in the operation data of the inversion unit：Inversion unit input voltage
And input power.
Optionally, the broadcast type network is wireline communication network or cordless communication network.
Optionally, the wireline communication network supports CAN communication, power line carrier communication, fiber optic communication or 485 communications；
The cordless communication network supports WI-FI communications.
A kind of cascaded inverter control method, be applied to by master controller and with it is each in the cascaded inverter
The broadcast type network that the slave controller that a inversion unit is arranged in a one-to-one correspondence is constituted；The cascaded inverter control method packet
It includes：
In each communication cycle, the master controller and communication bus is respectively occupied successively from controller, and respectively from control
Device processed obtains the data transmitted on the communication bus；
Wherein, the master controller occupies communication bus, refers to：The operation data of the master controller acquisition AC load
Middle change rate is less than the data of threshold value, and is sent on the communication bus in the form of broadcast；Described occupied from controller is led to
Believe bus, refers to：The change rate from the operation data that controller acquires itself corresponding inversion unit is less than the threshold value
Data, and be sent on the communication bus in the form of broadcast；
The data transmitted on the communication bus respectively acquired from controller according to itself and described, it is corresponding inverse to calculate itself
Become modulation voltage, modulation degree and the duty ratio of unit, generate pwm signal, drives the electric power electricity in itself corresponding inversion unit
Sub switch.
The master controller and from controller be respectively the node in the broadcast type network；
Optionally, after each node gathered data, further include：Judge whether the data of itself acquisition abnormal conditions occur,
If so, before a upper node terminates the occupancy to the communication bus, next minor node starts to occupy the communication bus, with wide
The form broadcast will be sent to the relevant warning information of the abnormal conditions on the communication bus.
Optionally, change rate is less than the data of threshold value in the operation data of master controller acquisition AC load, including：
The master controller acquires grid voltage amplitude；
The change rate from the operation data that controller acquires itself corresponding inversion unit is less than the number of the threshold value
According to, including：The input voltage and input power that itself corresponding inversion unit is acquired from controller.
Optionally, the broadcast type network is wireline communication network or cordless communication network.
Optionally, the wireline communication network supports CAN communication, power line carrier communication, fiber optic communication or 485 communications；
The cordless communication network supports WI-FI communications.
It can be seen from the above technical scheme that the present invention claims the data transmitted on communication bus, to be only limitted to change rate non-
Often low data, so compared with the prior art, in identical inversion unit quantity and identical communication data byte quantity
In the case of, the present invention allows ensureing control performance and under the premise of constant bandwidth, using lower traffic rate and lower
Baud rate.Moreover, because variation degree is little in a short time for the data transmitted on communication bus, even if so this communication cycle
There is situations such as error code, packet loss in transmission process in these interior data, respectively still can be along using in a communication cycle from controller
Data calculated, without causing result of calculation large error occur, to improve system stability and robustness.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of cascaded inverter structural schematic diagram disclosed in the prior art；
Fig. 2 is a kind of cascaded inverter control system architecture schematic diagram disclosed by the embodiments of the present invention；
Fig. 3 is a kind of cascaded inverter control method flow chart disclosed by the embodiments of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of cascaded inverter control systems, to realize in the control to cascaded inverter
In system, the requirement to traffic rate and baud rate can be reduced under the premise of ensureing control performance and constant bandwidth, and improve
The stability and robustness of cascaded inverter control system.
As shown in Figure 1, the cascaded inverter includes multiple inversion units, the outlet side of each inversion unit is in series
After access AC load, input side connects independent DC source.Wherein, the AC load can be passive AC load, also may be used
To be active ac load, the passive AC load includes but not limited to AC network.The DC source can be accumulator
Or photovoltaic module etc..The inversion unit can be two level of full-bridge topology, full-bridge three-level topology or half-bridge three-level topology
Deng.The output end of the cascaded inverter can select series connection or not series, parallel or not parallel filtering unit, the filtering list
Member may be selected to be active filter or passive filter.The output end of each inversion unit can select to connect or do not connect, simultaneously
Join or parallel filtering unit, the filter unit not may be selected to be active filter or passive filter equally.
As shown in Fig. 2, the cascaded inverter control system is a pair of by master controller and with each inversion unit one
The broadcast type network that the slave controller that should be arranged is constituted, that is to say, that the master controller and from controller be all respectively broadcast
Node in formula network.So-called broadcast type network refers to that only there are one single communication channels in a network, by this network
All nodes are shared, and the data that any one node is sent out can be received by other all nodes.The broadcast type net
Network can be wireline communication network, such as the network that support CAN communication, power line carrier communication, fiber optic communication or 485 communicate；
It can also be cordless communication network, such as support the network of WI-FI communications.
For the broadcast type network, in each communication cycle, the master controller and respectively occupied successively from controller
Communication bus, such as：It is numbered in advance for each node in the broadcast type network, in a communication cycle, respectively
The order of node by number is sent data in the form of broadcast on communication bus in turn, and next node is always in a upper section
Point is just sent data to after being sent completely on communication bus, to avoid communication bus data collision, and ensure that each node
At least update is primary in a communication cycle for the data received by communication bus.Wherein, the master controller is specifically used
Less than the data of threshold value, (change rate is less than the data of threshold value to change rate, refers in the operation data for acquiring the AC load
Variable quantity is very small in a communication cycle, is not in the data of mutation), and it is sent to communication in the form of broadcast
In bus；The change rate from the operation data that controller is specifically used for itself corresponding inversion unit of acquisition is less than the threshold value
Data, and it is sent in the form of broadcast on communication bus.
It is described to be additionally operable to obtain the data transmitted on communication bus, including the AC load and other institutes from controller
There is change rate in the operation data of inversion unit to be less than the data of the threshold value；Further according to the AC load and all inversion lists
Change rate is less than the data of the threshold value in the operation data of member, calculates modulation voltage, the modulation degree of itself corresponding inversion unit
And duty ratio, pwm signal is generated, the electronic power switch in itself corresponding inversion unit is driven.
As it can be seen that in the broadcast type network, the data transmitted on communication bus are the data that change rate is less than threshold value.
That is, data that whether master controller is sent on communication bus or being respectively sent to the communication bus from controller
On data, be all only limitted in a communication cycle that variable quantity is very small, is not in the data of mutation, for example, the friendship
Grid voltage amplitude in the operation data of current load, inversion unit input voltage in the operation data of the inversion unit and
Input power etc..
Other than the data transmitted on communication bus, respectively from controller in the modulation electricity for calculating itself corresponding inversion unit
Other that be used data when pressure, modulation degree and duty ratio are directly obtained from local.It illustrates：Master controller acquires
Grid voltage amplitude is simultaneously sent on communication bus, respectively acquires the input voltage of itself corresponding inversion unit and defeated from controller
Enter power and is sent on communication bus；These data are respectively obtained from communication bus from controller, in addition respectively from controller also
Needing acquisition inversion unit output current and calculating grid phase, (grid phase from controller according to timer internal by calculating
To) the very high data of Equal variation, it is then obtained from communication bus according to itself, itself acquisition and calculated these count
According to calculating this from the modulation voltage of the corresponding inversion unit of controller, modulation degree and duty ratio.
Wherein, before system starts, can artificially preselect which data is the data that change rate is less than threshold value, which data
It is not less than the data of the threshold value for change rate, and is configured in master controller and respectively from controller, to facilitates system to open
It moves rear master controller and is respectively directly acquired from controller.
Based on above description it is found that compared to the prior art, the embodiment of the present invention will acquire respectively corresponding inverse from controller
The task of the operation data of change unit, and the modulation voltage of each inversion unit of calculating, modulation degree and duty ratio Equal variation are non-
The task of normal high data, distribute to it is each executed from controller, to reduce the work load of master controller, be conducive to carry
The arithmetic speed of high broadcast formula network entirety.
Moreover, because the data transmitted on communication bus are only limitted to the low-down data of change rate, and not comprising quickly change
The data of change, so compared with the prior art, in identical inversion unit quantity and the feelings of identical communication data byte quantity
Under condition, the embodiment of the present invention allows under the premise of ensureing control performance and constant bandwidth, using lower traffic rate and more
Low baud rate.As it can be seen that compared to the prior art, the embodiment of the present invention drops under the premise of ensureing control performance and constant bandwidth
The low requirement to traffic rate and baud rate.
Moreover, because the data transmitted on communication bus will not quickly change, even if so these are counted in this communication cycle
According to occurring situations such as error code, packet loss in transmission process, respectively from controller still can along the data used in a communication cycle into
Row calculates, without causing result of calculation large error occur, to improve system stability and robustness.
Optionally, each node is additionally operable to when judging that abnormal conditions occur in the data for obtaining itself acquisition, in a upper section
Point terminates to start before occupying the communication bus occupancy of the communication bus, next minor node, will be in the form of broadcast
The relevant warning information of abnormal conditions is sent on the communication bus, to reach the work(of emergency preferential answering
Energy.
It illustrates, it is assumed that in each communication cycle, the order from 1 to N occupies communication always to each node in turn by number
Line, a certain moment lower node 1 judge that abnormal conditions occurs in the operation data for obtaining itself acquisition, then node 1 first has to judge
Whether communication bus is currently idle, if node 3 is occupying communication bus at this time, node 1 needs to terminate to logical until node 3
It when believing the occupancy of bus, could will be sent on communication bus with the relevant warning information of the abnormal conditions, thus will be abnormal
Situation notifies other all nodes, when node 1 terminates the occupancy to communication bus, then is sequentially accounted in turn since node 4
Use communication bus.
In addition, the embodiment of the invention also discloses a kind of cascaded inverter control method, be applied to by master controller with
And the broadcast type network that the slave controller being arranged in a one-to-one correspondence with each inversion unit in the cascaded inverter is constituted；Such as
Shown in Fig. 3, the cascaded inverter control method includes：
Step S01：In each communication cycle, the master controller and communication bus is respectively occupied successively from controller, and
And the data transmitted on communication bus are respectively obtained from controller.
Wherein, the master controller occupies communication bus, refers to：It is defeated that the master controller acquires the cascaded inverter
Go out the data that change rate in the operation data of the AC load of side is less than threshold value, and the communication is sent to always in the form of broadcast
On line.It is described to occupy communication bus from controller, refer to：The operation number that itself corresponding inversion unit is acquired from controller
It is less than the data of the threshold value according to middle change rate, and is sent on the communication bus in the form of broadcast.
Step S02：The data transmitted on the communication bus respectively acquired from controller according to itself and described, calculate itself
Modulation voltage, modulation degree and the duty ratio of corresponding inversion unit generate pwm signal, drive in itself corresponding inversion unit
Electronic power switch.
The master controller and from controller be respectively the node in the broadcast type network.Optionally, each node is adopted
After collecting operation data, further include：Judge whether the data of itself acquisition abnormal conditions occur, if so, terminating pair in a upper node
The occupancy of the communication bus, next minor node start before occupying the communication bus, will be with the exception in the form of broadcast
The relevant warning information of situation is sent on communication bus.
Optionally, the broadcast type network is wireline communication network or cordless communication network.
Optionally, the wireline communication network supports CAN communication, power line carrier communication, fiber optic communication or 485 communications.
Optionally, the cordless communication network supports WI-FI communications.
In conclusion the present invention claims the data transmitted on communication bus to be only limitted to the low-down data of change rate, so
Compared with the prior art, in the case of identical inversion unit quantity and identical communication data byte quantity, the present invention permits
Perhaps under the premise of ensureing control performance and constant bandwidth, using lower traffic rate and lower baud rate.Moreover, because
Variation degree is little in a short time for the data transmitted on communication bus, even if so these data are being transmitted in this communication cycle
Occur situations such as error code, packet loss in the process, respectively can still be calculated from controller along the data used in a communication cycle, and
Result of calculation will not be caused large error occur, to improve system stability and robustness.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For being cascaded disclosed in embodiment
For type inverter control method, since it is corresponding with cascaded inverter control system disclosed in embodiment, so description
It is fairly simple, related place illustrates referring to control system part.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest range of features of novelty.
Claims (10)
1. a kind of cascaded inverter control system, which is characterized in that the cascaded inverter control system is by main control
The broadcast type network that device and the slave controller being arranged in a one-to-one correspondence with each inversion unit are constituted；
In each communication cycle, the master controller and communication bus is respectively occupied successively from controller；
The master controller, change rate is less than the data of threshold value in the operation data for acquiring AC load, and with broadcast
Form is sent on the communication bus；
It is described from controller, in the operation data for acquiring itself corresponding inversion unit change rate be less than the threshold value number
According to, and be sent on the communication bus in the form of broadcast；The data transmitted on the communication bus are obtained, are adopted according to itself
Data that are collection and being transmitted on the communication bus calculate the modulation voltage of itself corresponding inversion unit, modulation degree and account for
Empty ratio generates pwm signal, drives the electronic power switch in itself corresponding inversion unit.
2. cascaded inverter control system according to claim 1, which is characterized in that the master controller and respectively from control
Device processed is the node in the broadcast type network；
Each node is additionally operable to, when judging that abnormal conditions occur in the data for obtaining itself acquisition, in a upper node terminate to described
The occupancy of communication bus, next minor node start before occupying the communication bus, will be with the abnormal conditions in the form of broadcast
Relevant warning information is sent on the communication bus.
3. cascaded inverter control system according to claim 1 or 2, which is characterized in that the fortune of the AC load
Change rate includes less than the data of threshold value in row data：Grid voltage amplitude；
Change rate is less than the data of the threshold value in the operation data of the inversion unit, including：Inversion unit input voltage and
Input power.
4. cascaded inverter control system according to claim 1, which is characterized in that the broadcast type network is wired
Communication network or cordless communication network.
5. cascaded inverter control system according to claim 4, which is characterized in that the wireline communication network is supported
CAN communication, power line carrier communication, fiber optic communication or 485 communications；The cordless communication network supports WI-FI communications.
6. a kind of cascaded inverter control method, which is characterized in that be applied to inverse by master controller and with the cascade connection type
The broadcast type network that the slave controller that each inversion unit become in device is arranged in a one-to-one correspondence is constituted；The cascaded inverter control
Method processed includes：
In each communication cycle, the master controller and communication bus is respectively occupied successively from controller, and respectively from controller
Obtain the data transmitted on the communication bus；
Wherein, the master controller occupies communication bus, refers to：Become in the operation data of the master controller acquisition AC load
Rate is less than the data of threshold value, and is sent on the communication bus in the form of broadcast；It is described to occupy communication always from controller
Line refers to：The change rate from the operation data that controller acquires itself corresponding inversion unit is less than the number of the threshold value
According to, and be sent on the communication bus in the form of broadcast；
The data transmitted on the communication bus respectively acquired from controller according to itself and described calculate itself corresponding inversion list
Modulation voltage, modulation degree and the duty ratio of member generate pwm signal, the power electronics in itself corresponding inversion unit are driven to open
It closes.
7. cascaded inverter control method according to claim 6, which is characterized in that the master controller and respectively from control
Device processed is the node in the broadcast type network；
After each node gathered data, further include：Judge whether the data of itself acquisition abnormal conditions occur, if so, upper one
Node terminates the occupancy to the communication bus, next minor node starts before occupying the communication bus, will in the form of broadcast
It is sent on the communication bus with the relevant warning information of the abnormal conditions.
8. the cascaded inverter control method described according to claim 6 or 7, which is characterized in that the master controller acquisition
Change rate is less than the data of threshold value in the operation data of AC load, including：The master controller acquires grid voltage amplitude；
The change rate from the operation data that controller acquires itself corresponding inversion unit is less than the data of the threshold value, packet
It includes：The input voltage and input power that itself corresponding inversion unit is acquired from controller.
9. cascaded inverter control method according to claim 6, which is characterized in that the broadcast type network is wired
Communication network or cordless communication network.
10. cascaded inverter control method according to claim 9, which is characterized in that the wireline communication network branch
Hold CAN communication, power line carrier communication, fiber optic communication or 485 communications；The cordless communication network supports WI-FI communications.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581665A (en) * | 2019-10-23 | 2019-12-17 | 阳光电源股份有限公司 | Cascaded converter and control system thereof |
| CN114598690A (en) * | 2022-02-24 | 2022-06-07 | 深圳市海洋王照明工程有限公司 | Communication method and device of cascade equipment system and electronic equipment |
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