CN110971557A - Carrier synchronization method and system for parallel operation of multiple converters - Google Patents
Carrier synchronization method and system for parallel operation of multiple converters Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation
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Abstract
The invention provides a carrier synchronization method and a carrier synchronization system when a plurality of converters work in parallel. The frequency of the modulation wave signal is lower than that of the original synchronous signal, and the frequency of the carrier synchronous clock signal obtained by modulation is consistent with that of the modulation wave signal, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the method and the device do not need to transmit the synchronization signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a carrier synchronization method and a carrier synchronization system for parallel operation of a plurality of converters.
Background
When a plurality of converters are operated in parallel, because the carrier frequencies of different converters are determined by respective controllers, and the carrier frequencies are generated by a series of conversions of oscillation circuits such as crystal oscillators, the carrier frequencies of the controllers are deviated due to the dispersion of the oscillation circuits, and the deviation of the carrier frequencies causes a series of problems in a system. In inverter applications, there are two main effects: one is the subharmonic oscillation problem and the other is the common mode current circulating problem in the non-isolated system.
In order to solve the problem that carrier frequencies are inconsistent when a plurality of converters work in parallel, two methods are available at present. Firstly, for the situation that the positions of different controllers are relatively close, the controllers of all converters are directly connected by using the synchronization pins of the controllers so as to achieve the purpose of carrier synchronization, as shown IN fig. 1, SYN _ IN represents the synchronization input pin of the controller, and SYN _ OUT represents the synchronization output pin of the controller; however, the strength and frequency of the synchronization signal transmitted between the controllers are weak, which limits the long-distance transmission.
For the situation that the different controllers are far away, the communication conversion module is used for transmitting the synchronization signal while transmitting the conventional signal, and the software is used for identifying the synchronization signal to realize synchronization, as shown in fig. 2, TX represents a transmitting end of the controller, and RX represents a receiving end of the controller; however, since the requirement on the accuracy of carrier synchronization is high, for example, in the carrier frequency of several KHz, the accuracy of carrier synchronization is generally in the us or even ns level, so that the carrier synchronization is realized by adopting a communication method, which means that the communication interruption priority is increased to the highest level in software, so as to avoid that the realization of the carrier co-wave function is influenced by the interruption of a communication task by other tasks; meanwhile, a scheme for loading communication information on carrier synchronization information at a sending end is also specially designed to ensure that the synchronization information acquired by the receiving end is consistent with the sending end as much as possible. These mean that the software architecture needs to be adjusted to meet the requirement of carrier synchronization, which increases the complexity of the software architecture and increases the communication pressure.
Disclosure of Invention
In view of this, the present invention provides a method and a system for synchronizing carriers when a plurality of converters are working in parallel, which are intended to achieve carrier synchronization when a plurality of converters are working in parallel on the basis of reducing influence on software architecture and communication pressure.
In order to achieve the above object, the following solutions are proposed:
in a first aspect, the present invention provides a carrier synchronization method when multiple converters work in parallel, including:
modulating original synchronous signals sent by a main controller in the plurality of converters by using modulated wave signals to obtain carrier synchronous clock signals, wherein the frequency of the modulated wave signals is lower than that of the original synchronous signals;
and transmitting the carrier synchronization clock signal to each slave controller in the plurality of converters, so that each slave controller performs at least one time of carrier synchronization in each period of the carrier synchronization clock signal.
Optionally, the transmitting the carrier synchronization clock signal to each slave controller in the plurality of converters specifically includes:
and transmitting the carrier synchronous clock signal to each slave controller in the plurality of converters by using a differential transmission technology.
Optionally, the hardware of the master controller is the same as that of each of the slave controllers, and the master controller is a controller automatically selected according to a preset competition mechanism.
Optionally, the modulated wave signal is generated by the main controller.
In a second aspect, the present invention provides a carrier synchronization system when multiple converters work in parallel, including:
the digital circuit module is used for modulating original synchronous signals sent by a main controller in the plurality of converters by using modulation wave signals to obtain carrier synchronous clock signals, and the frequency of the modulation wave signals is lower than that of the original synchronous signals;
and the signal transmission module is used for sending the carrier synchronization clock signal to each slave controller in the plurality of converters so that each slave controller can carry out at least one time of carrier synchronization in each period of the carrier synchronization clock signal.
Optionally, the signal transmission module is specifically configured to:
and transmitting the carrier synchronous clock signal to each slave controller in the plurality of converters by using a differential transmission technology.
Optionally, the signal transmission module includes: the single-end and differential conversion circuit is arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter as the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and takes the form of a single-ended signal into a carrier synchronous clock signal which takes the form of a differential signal;
the unidirectional transmission bus is used for transmitting the carrier synchronous clock signals in the form of differential signals to single-ended and differential conversion circuits which are respectively positioned in the same converter with the slave controllers; and the number of the first and second groups,
and the single-ended and differential conversion circuits are respectively positioned in the same converter with the slave controllers and are used for converting the carrier synchronous clock signals in the form of differential signals into carrier synchronous signals in the form of single-ended signals and transmitting the carrier synchronous signals to the slave controllers.
Optionally, the hardware of the master controller is the same as that of each of the slave controllers, and the master controller is a controller automatically selected according to a preset competition mechanism;
each converter in the plurality of converters comprises a digital circuit module;
the digital circuit module is positioned in the same converter as the main controller and is used for modulating the original synchronous signal sent by the main controller by using a modulating wave signal to obtain a carrier synchronous clock signal;
the signal transmission module is specifically configured to send the carrier synchronization clock signal to each slave controller through a digital circuit module located in the same converter as each slave controller.
Optionally, the signal transmission module includes: the single-end and differential conversion circuit is arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter as the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and takes the form of a single-ended signal into a carrier synchronous clock signal which takes the form of a differential signal;
the double-phase transmission bus is used for transmitting the carrier synchronization clock signals in the form of differential signals to each single-ended and differential conversion circuit which is positioned in the same converter as the slave controller; and the number of the first and second groups,
and each single-ended and differential conversion circuit which is positioned in the same current transformer with the slave controller is used for converting the carrier synchronous clock signal in the form of the differential signal into a carrier synchronous signal in the form of a single-ended signal and transmitting the carrier synchronous signal to the slave controller.
Optionally, the modulated wave signal is generated by the main controller, a timer of the digital circuit module, or an external clock circuit.
Optionally, the digital circuit module specifically includes: a circuit built by a basic logic circuit, an FPGA (field programmable Gate Array) or a CPLD (Complex programmable logic Device).
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the technical scheme, the method and the system for carrier synchronization during parallel operation of the plurality of converters comprise the steps of modulating original synchronization signals sent by main controllers in the plurality of converters by using modulation wave signals to obtain carrier synchronization clock signals, and transmitting the carrier synchronization clock signals to each slave controller in the plurality of converters to perform carrier synchronization. The frequency of the modulation wave signal is lower than that of the original synchronous signal, and the frequency of the carrier synchronous clock signal obtained by modulation is consistent with that of the modulation wave signal, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the method and the device do not need to transmit the synchronization signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
Furthermore, when the carrier synchronization clock signals are transmitted between the master controller and the slave controller, the signals are transmitted by using a differential transmission technology, so that the anti-interference capability of the signals is improved. And automatically selecting the main controller through a competition mechanism, so that the hardware settings of all controllers are the same.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
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, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of carrier synchronization performed by a synchronization pin of a controller when a plurality of converters are in parallel operation;
fig. 2 is a schematic diagram of carrier synchronization performed by transmitting a synchronization signal through a communication conversion module when a plurality of converters are in parallel operation;
fig. 3 is a flowchart of a carrier synchronization method when a plurality of converters work in parallel according to an embodiment of the present invention;
fig. 4 is a schematic diagram of signal modulation according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a carrier synchronization system when multiple converters work in parallel according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a main controller generating a modulated wave signal according to an embodiment of the present invention;
FIG. 7 is a diagram of a digital circuit module according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another carrier synchronization system when multiple converters operate in parallel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a carrier synchronization system when a plurality of converters operate in parallel according to another embodiment of the present invention;
fig. 10 is a schematic diagram of a carrier synchronization system when multiple converters operate in parallel according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
The embodiment provides a carrier synchronization method for parallel operation of multiple converters, and referring to fig. 3, the carrier synchronization method includes the steps of:
s31: and modulating the original synchronous signals sent by the main controllers in the plurality of converters by using the modulation wave signals to obtain carrier synchronous clock signals.
The converter comprises a controller, wherein the controller of one converter in the plurality of converters which work in parallel can be selected as a master controller, and the controllers of other converters are selected as slave controllers. The master controller sends a carrier synchronization clock signal to the slave controller.
In the present invention, the original synchronization signal refers to a synchronization signal transmitted when carrier synchronization is performed by using the method shown in fig. 1, and the frequency of the synchronization signal is high and is not suitable for long-distance transmission. The frequency of the modulation wave signal is lower than that of the original synchronous signal, the original synchronous signal is modulated through the modulation wave signal, and the frequency of the obtained modulated signal (namely the carrier synchronous clock signal) is consistent with that of the modulation wave signal, so that the method is suitable for long-distance transmission.
In one or more specific embodiments, the synchronization signal is passed when the modulated wave signal is at a low level. Specifically, the positive pulse width of the modulated wave signal is set to be larger than the negative pulse width, the carrier synchronization Clock signal is set to be at the high level when the modulated wave signal is at the low level, and the carrier synchronization Clock signal is set to be at the high level when the modulated wave signal is at the high level, as shown in fig. 4, SYN _ OUT represents the original pulse signal, SYN _ Clock represents the modulated wave signal, and SYN represents the carrier synchronization Clock signal.
In one or more specific embodiments, the synchronization signal is passed when the modulated wave signal is at a high level. Specifically, the negative pulse width of the modulated wave signal is set to be larger than the positive pulse width, the carrier synchronization clock signal is made to coincide with the original synchronization signal when the modulated wave signal is at a high level, the carrier synchronization clock signal is at a low level when the modulated wave signal is at a low level,
s32: and transmitting the carrier synchronization clock signal to each slave controller in the converter so that each slave controller performs at least one time of carrier synchronization in each period of the carrier synchronization clock signal.
Specifically, the slave controller may perform carrier synchronization on a rising edge of the carrier synchronization clock signal or perform carrier synchronization on a falling edge of the carrier synchronization clock signal.
In the carrier synchronization method for the parallel operation of the multiple converters provided in this embodiment, the original synchronization signal sent by the master controller in the multiple converters is modulated by using the modulation wave signal to obtain the carrier synchronization clock signal, and the carrier synchronization clock signal is transmitted to each slave controller in the multiple converters to perform carrier synchronization. The frequency of the modulation wave signal is lower than that of the original synchronous signal, and the frequency of the carrier synchronous clock signal obtained by modulation is consistent with that of the modulation wave signal, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the method and the device do not need to transmit the synchronization signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
In one or more embodiments, the carrier synchronization clock signal is communicated between the master controller and the slave controller using a differential transmission technique to improve the signal immunity to interference. Specifically, the single-ended signal is converted into a differential signal at the master controller end and then transmitted to the slave controller, the transmitted differential signal is converted into a single-ended signal at the slave controller end, and then subsequent carrier synchronization processing is performed.
In one or more embodiments, the hardware of the master and slave controllers is the same, and the master controller is automatically selected through a contention mechanism. The modulated wave signal is generated by a main controller.
The following are embodiments of systems of the present invention that may be used to perform embodiments of methods of the present invention. For details which are not disclosed in the embodiments of the system of the present invention, reference is made to the embodiments of the method of the present invention.
Referring to fig. 5, a carrier synchronization system for parallel operation of multiple converters is provided in this embodiment, and includes: the device comprises a digital circuit module and a signal transmission module.
And the digital circuit module is used for modulating the original synchronous signals sent by the main controllers in the multiple converters by using the modulation wave signals to obtain carrier synchronous clock signals, and the frequency of the modulation wave signals is lower than that of the original synchronous signals.
And the signal transmission module is used for sending a carrier synchronization clock signal to each slave controller in the plurality of converters so that each slave controller can carry out at least one time of carrier synchronization in each period of the carrier synchronization clock signal. The signal transmission module may specifically be a unidirectional transmission bus, and transmits the carrier synchronization clock signal to each slave controller.
The carrier synchronization system for the parallel operation of the plurality of converters provided by the embodiment comprises a digital circuit module and a signal transmission module, wherein the digital circuit module is arranged at a main controller end of the plurality of converters and is used for modulating by using an original synchronization signal sent by a modulation wave signal main controller to obtain a carrier synchronization clock signal; and the signal transmission module transmits the carrier synchronization clock signal to each slave controller in the plurality of converters to carry out carrier synchronization. The frequency of the modulation wave signal is lower than that of the original synchronous signal, and the frequency of the carrier synchronous clock signal obtained by modulation is consistent with that of the modulation wave signal, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the method and the device do not need to transmit the synchronization signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
The modulated wave signal may be generated by a main controller, a timer of a digital circuit module, or an external clock circuit, etc. in various ways. Fig. 6 shows a schematic diagram of the generation of a modulated wave signal by the main controller. The digital circuit module may be a circuit built for a basic logic circuit, for example, an or gate is used to implement a modulation function, as shown in fig. 7, a latch and/or a digital switch may also be used to implement the modulation function; the digital circuit module can also be a complex integrated logic circuit such as FPGA or CPLD.
In one or more specific embodiments, the signal transmission module is configured to transmit the carrier synchronous clock signal to each slave controller in the plurality of converters using a differential transmission technique. The specific signal transmission module includes a unidirectional transmission bus and a single-ended and differential conversion circuit disposed in each of the plurality of converters operating in parallel, as shown in fig. 8. The single-ended and differential conversion circuit is positioned in the same converter as the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and takes the form of a single-ended signal into a carrier synchronous clock signal which takes the form of a differential signal; the unidirectional transmission bus is used for transmitting the carrier synchronous clock signals in the form of differential signals to the single-ended and differential conversion circuits which are respectively positioned in the same converter with each slave controller; and the single-ended and differential conversion circuits are respectively positioned in the same converter with each slave controller and are used for converting the carrier synchronization clock signals in the form of differential signals into carrier synchronization signals in the form of single-ended signals, transmitting the carrier synchronization signals to the slave controllers and then carrying out carrier synchronization processing on the slave controllers.
In one or more embodiments, a controller is not designated as a master controller, hardware settings of controllers of the converters are the same, and the master controller is automatically selected according to a preset competition mechanism. The carrier synchronization clock signal can be transmitted to each slave controller in the plurality of current transformers by using a differential transmission technology; specifically, referring to fig. 9, each of the plurality of converters operating in parallel is provided with a digital circuit module; the signal transmission module comprises a differential bus and a single-ended and differential conversion circuit arranged in each of the plurality of converters which work in a combined mode. The sending function of the single-ended and differential conversion circuits in each converter is closed by default; and after receiving the sending enabling signal sent by the main controller, the single-ended and differential conversion circuit in the same converter as the main controller sends a carrier synchronization clock signal to the differential bus. The receiving function of each single-ended and differential conversion circuit is turned on by default; and after receiving the carrier synchronization clock signal in the differential bus, the single-ended and differential conversion circuit in the same converter as the slave controller sends the carrier synchronization clock signal to the slave controller. The differential bus in this embodiment is a bidirectional transmission bus. It should be noted that fig. 9 is only an exemplary illustration, and the transmit enable signal may also be transmitted to the single-ended and differential conversion circuit located in the same converter as the main controller through other devices.
The carrier synchronous clock signals in the form of single-ended signals can be directly transmitted to each slave controller in the multiple converters; specifically, referring to fig. 10, a digital circuit module is provided in each of a plurality of converters operating in parallel. The sending function of the digital circuit module in each converter is closed by default; and after receiving the sending enabling signal sent by the main controller, the digital circuit module in the same converter as the main controller sends a carrier synchronization clock signal to the bidirectional transmission bus. The receive function of each digital circuit module is turned on by default; and after receiving the carrier synchronization clock signal in the bidirectional transmission bus by the digital circuit module which is positioned in the same converter as the slave controller, the digital circuit module sends the carrier synchronization clock signal to the slave controller.
For the system embodiments, since they substantially correspond to the method embodiments, reference may be made to the partial description of the method embodiments for relevant points. The above-described system embodiments are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the present specification, the emphasis points of the embodiments are different from those of the other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A carrier synchronization method for parallel operation of a plurality of converters is characterized by comprising the following steps:
modulating original synchronous signals sent by a main controller in the plurality of converters by using modulated wave signals to obtain carrier synchronous clock signals, wherein the frequency of the modulated wave signals is lower than that of the original synchronous signals;
and transmitting the carrier synchronization clock signal to each slave controller in the plurality of converters, so that each slave controller performs at least one time of carrier synchronization in each period of the carrier synchronization clock signal.
2. The carrier synchronization method for the parallel operation of the plurality of converters according to claim 1, wherein the transmitting the carrier synchronization clock signal to each slave controller in the plurality of converters specifically comprises:
and transmitting the carrier synchronous clock signal to each slave controller in the plurality of converters by using a differential transmission technology.
3. The method for synchronizing the carriers during the parallel operation of the plurality of converters as claimed in claim 1, wherein the hardware of the master controller is the same as that of each of the slave controllers, and the master controller is a controller automatically selected according to a preset competition mechanism.
4. The method of claim 1, wherein the modulated wave signal is generated by the master controller.
5. The utility model provides a carrier synchronization system when many converters parallel operation which characterized in that includes:
the digital circuit module is used for modulating original synchronous signals sent by a main controller in the plurality of converters by using modulation wave signals to obtain carrier synchronous clock signals, and the frequency of the modulation wave signals is lower than that of the original synchronous signals;
and the signal transmission module is used for sending the carrier synchronization clock signal to each slave controller in the plurality of converters so that each slave controller can carry out at least one time of carrier synchronization in each period of the carrier synchronization clock signal.
6. The carrier synchronization system for the parallel operation of the plurality of converters according to claim 5, wherein the signal transmission module is specifically configured to:
and transmitting the carrier synchronous clock signal to each slave controller in the plurality of converters by using a differential transmission technology.
7. The system for synchronizing carriers during the parallel operation of a plurality of converters as claimed in claim 6, wherein the signal transmission module comprises:
the single-end and differential conversion circuit is arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter as the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and takes the form of a single-ended signal into a carrier synchronous clock signal which takes the form of a differential signal;
the unidirectional transmission bus is used for transmitting the carrier synchronous clock signals in the form of differential signals to single-ended and differential conversion circuits which are respectively positioned in the same converter with the slave controllers; and the number of the first and second groups,
and the single-ended and differential conversion circuits are respectively positioned in the same converter with the slave controllers and are used for converting the carrier synchronous clock signals in the form of differential signals into carrier synchronous signals in the form of single-ended signals and transmitting the carrier synchronous signals to the slave controllers.
8. The carrier synchronization system for the parallel operation of the plurality of converters as claimed in claim 5, wherein the hardware of the master controller is the same as that of each of the slave controllers, and the master controller is a controller automatically selected according to a preset competition mechanism;
each converter in the plurality of converters comprises a digital circuit module;
the digital circuit module is positioned in the same converter as the main controller and is used for modulating the original synchronous signal sent by the main controller by using a modulating wave signal to obtain a carrier synchronous clock signal;
the signal transmission module is specifically configured to send the carrier synchronization clock signal to each slave controller through a digital circuit module located in the same converter as each slave controller.
9. The system according to claim 8, wherein the signal transmission module is specifically configured to:
and transmitting the carrier synchronous clock signal to each slave controller in the plurality of converters by using a differential transmission technology.
10. The system for synchronizing carriers during the parallel operation of a plurality of converters as claimed in claim 9, wherein the signal transmission module comprises:
the single-end and differential conversion circuit is arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter as the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and takes the form of a single-ended signal into a carrier synchronous clock signal which takes the form of a differential signal;
the double-phase transmission bus is used for transmitting the carrier synchronization clock signals in the form of differential signals to each single-ended and differential conversion circuit which is positioned in the same converter as the slave controller; and the number of the first and second groups,
and each single-ended and differential conversion circuit which is positioned in the same current transformer with the slave controller is used for converting the carrier synchronous clock signal in the form of the differential signal into a carrier synchronous signal in the form of a single-ended signal and transmitting the carrier synchronous signal to the slave controller.
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| CN113517975A (en) * | 2021-09-13 | 2021-10-19 | 天津飞旋科技股份有限公司 | Carrier synchronization control method, system, converter device and readable storage medium |
| CN113725918A (en) * | 2021-09-23 | 2021-11-30 | 国电南瑞科技股份有限公司 | Multi-loop parallel synchronization method and system for high-power wind power converter |
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