CN109818486B - Frequency converter thermal redundancy control method and redundancy frequency converter device - Google Patents
Frequency converter thermal redundancy control method and redundancy frequency converter device Download PDFInfo
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Abstract
The invention discloses a frequency converter thermal redundancy control method and a redundancy frequency converter device, wherein the redundancy frequency converter device comprises a main frequency converter and M slave frequency converters, the main frequency converter and each slave frequency converter are connected in parallel, the main frequency converter is respectively in communication connection with each slave frequency converter, and the method comprises the following steps: in normal operation, the main frequency converter controls the main frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm; when any frequency converter in the device has a local fault, the frequency converter with the fault exits; and when a communication fault occurs between the main frequency converter and the slave frequency converter, the slave frequency converter exits. Each frequency converter in the device meets the capacity of single full-load operation, when any fault occurs to one frequency converter in the system, the frequency converter exits the system, other frequency converters continue to operate, the load is not affected, and the full-load full-speed operation can be realized.
Description
Technical Field
The invention relates to the field of industrial electricity, in particular to a frequency converter thermal redundancy control method and a redundancy frequency converter device.
Background
With the development of industrial technology, medium voltage frequency converters are more and more widely applied. In recent years, the requirement on reliability in the field of frequency converters is higher and higher, the reliability of operation of a single frequency converter is improved to a limited extent, and although the frequency converter can be switched to power frequency operation when the frequency converter fails, the frequency converter can cause great impact on loads and a power grid to influence the service life of equipment, and a plurality of precise loads cannot allow the failure to be directly switched to the power frequency operation, so that the system can be shut down.
At present, through retrieval, some frequency converter redundancy operation schemes, such as based on unit bypass redundancy design, are complex in structure and low in reliability, can only solve the working conditions of power unit faults and isolation transformer faults, cannot be used as the best if other complete machine faults occur, and can only operate at half speed after a treatable fault is bypassed, so that the process is influenced, and meanwhile, if the added bypass contactor fails, bypass failure or fault shutdown in bypass operation can also be caused.
It can be seen that there are at least the following technical problems in the prior art:
the redundant frequency converter device has a complex structure, and when a certain frequency converter complete machine fails, the operation and load operation of the rest frequency converters are easily affected, so that the operation reliability is low.
Disclosure of Invention
The embodiment of the invention provides a frequency converter thermal redundancy control method and a redundancy frequency converter device, and is used for solving the technical problems that in the prior art, the structure of the redundancy frequency converter device is complex, when a certain frequency converter complete machine fails, the operation and load operation of the rest frequency converters are easily affected, and the operation reliability is low.
In a first aspect, an embodiment of the present invention provides a method for controlling thermal redundancy of a frequency converter, where the method is applied to a redundant frequency converter device, the redundant frequency converter device includes a master frequency converter and M slave frequency converters, the master frequency converter and each slave frequency converter are connected in parallel, the master frequency converter is respectively connected to each slave frequency converter in a communication manner, where M is an integer greater than or equal to 1, and the method includes:
in normal operation, the main frequency converter controls the main frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm;
if the main frequency converter has a local fault, the main frequency converter controls the main frequency converter to exit the redundant frequency converter device, and the slave frequency converter with the largest or smallest identity identification number in the M slave frequency converters controls the main frequency converter to operate as a new main frequency converter;
and the new main frequency converter controls the main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters to normally operate according to a current sharing control algorithm, wherein the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters are in communication connection.
Optionally, after the master frequency converter controls itself and each slave frequency converter to normally operate according to a current sharing control algorithm, the method further includes:
if the local fault occurs to N slave frequency converters in the M slave frequency converters, the N slave frequency converters respectively control the N slave frequency converters to quit the redundant frequency converter device, wherein N is an integer which is more than or equal to 1 and less than or equal to M;
and the main frequency converter controls the main frequency converter and the slave frequency converters without local faults in the M slave frequency converters to normally operate according to a current sharing control algorithm.
Optionally, after the master frequency converter controls itself and each slave frequency converter to normally operate according to a current sharing control algorithm, the method further includes:
when communication failure occurs between the main frequency converter and at least one slave frequency converter in the M slave frequency converters, the slave frequency converter which has communication failure with the main frequency converter controls the slave frequency converter to exit the redundant frequency converter device;
and the master frequency converter controls the slave frequency converter without communication fault with the master frequency converter to normally operate according to a current sharing control algorithm.
Optionally, after the master frequency converter controls itself and each slave frequency converter to normally operate according to a current sharing control algorithm, the method further includes:
when a frequency converter to be cut in needs to be cut in the redundant frequency converter device, a main frequency converter in normal operation sends operation information of the main frequency converter in normal operation to the frequency converter to be cut in, so that the frequency converter to be cut in serves as a slave frequency converter to be cut in the redundant frequency converter device based on the operation information;
and the main frequency converter in normal operation controls the main frequency converter, the switched-in frequency converter to be switched in and the M auxiliary frequency converters to normally operate according to a current sharing control algorithm.
In a second aspect, an embodiment of the present invention provides a redundant frequency converter device, where the redundant frequency converter device includes a master frequency converter and M slave frequency converters, where the master frequency converter and each slave frequency converter are connected in parallel, and the master frequency converter is respectively in communication connection with each slave frequency converter, where M is an integer greater than or equal to 1;
in normal operation, the master frequency converter is used for controlling the master frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm;
if the main frequency converter has a local fault, the main frequency converter is used for controlling the main frequency converter to exit the redundant frequency converter device, and the slave frequency converters with the largest or smallest identity identification numbers in the M slave frequency converters control the main frequency converter to operate as a new main frequency converter;
and the new main frequency converter is used for controlling the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters to normally operate according to a current sharing control algorithm, wherein the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters are in communication connection.
Optionally, after the master frequency converter controls the master frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm, if a local fault occurs in N slave frequency converters of the M slave frequency converters, the N slave frequency converters are used to respectively control the master frequency converter to exit from the redundant frequency converter device, where N is an integer greater than or equal to 1 and less than or equal to M;
and the main frequency converter is used for controlling the main frequency converter and the slave frequency converters without local faults in the M slave frequency converters to normally operate according to a current sharing control algorithm.
Optionally, after the master frequency converter controls the master frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm, when a communication fault occurs between the master frequency converter and at least one slave frequency converter of the M slave frequency converters, the slave frequency converter having the communication fault with the master frequency converter is used for controlling the slave frequency converter to exit the redundant frequency converter device;
and the master frequency converter controls the slave frequency converter without communication fault with the master frequency converter to normally operate according to a current sharing control algorithm.
Optionally, after the master frequency converter controls the master frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm, when a frequency converter to be switched in needs to be switched into the redundant frequency converter device, the master frequency converter in normal operation sends operation information of the master frequency converter in normal operation to the frequency converter to be switched in, so that the frequency converter to be switched in is switched into the redundant frequency converter device as a slave frequency converter based on the operation information;
and the main frequency converter in normal operation controls the main frequency converter, the switched-in frequency converter to be switched in and the M auxiliary frequency converters to normally operate according to a current sharing control algorithm.
In a third aspect, an embodiment of the present invention provides a computer apparatus, which includes a processor, and the processor is configured to implement the steps of the method according to the first aspect when executing a computer program stored in a memory.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the method according to the embodiment of the first aspect.
One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
by adopting the technical scheme provided by the embodiment of the invention, each frequency converter meets the capability of single full-load operation, when any fault occurs to one frequency converter in the system, the frequency converter exits the system, the other frequency converters continue to operate, the load is not influenced, the frequency converter can operate at full speed and full load, if the main frequency converter fails, the slave frequency converter with the largest or smallest identification number in the slave frequency converter without communication fault with the main frequency converter operates as a new main frequency converter, and the like. When communication failure occurs, the slave is stopped by default, and the master machine can continue to operate with the rest slave machines without the communication failure in an on-load mode.
Drawings
Fig. 1A is a first flowchart of a method for controlling thermal redundancy of a frequency converter according to an embodiment of the present invention;
fig. 1B is an exemplary schematic diagram of a redundant frequency converter apparatus according to an embodiment of the present invention;
FIG. 2 is a second flowchart of a method for controlling thermal redundancy of a frequency converter according to an embodiment of the present invention;
FIG. 3 is a third flowchart of a method for controlling thermal redundancy of a frequency converter according to an embodiment of the present invention;
fig. 4 is another schematic diagram of a redundant frequency converter apparatus according to an embodiment of the present invention.
Detailed Description
In order to solve the technical problem, the technical scheme in the embodiment of the invention has the following general idea: the method comprises the following steps of: in normal operation, the main frequency converter controls the main frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm; in normal operation, the main frequency converter controls the main frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm; if the main frequency converter has a local fault, the main frequency converter controls the main frequency converter to exit the redundant frequency converter device, and the slave frequency converter with the largest or smallest identity identification number in the M slave frequency converters controls the main frequency converter to operate as a new main frequency converter; and the new main frequency converter controls the main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters to normally operate according to a current sharing control algorithm, wherein the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters are in communication connection. Each frequency converter in the device meets the capacity of independent full-load operation, when any fault occurs to one frequency converter in the system, the frequency converter exits the system, the other frequency converters continue to operate, the load is not influenced, the full-load full-speed operation can be realized, if the main frequency converter has a fault, the slave frequency converter with the largest or the smallest identification number in the slave frequency converter without communication fault between the main frequency converter and the main frequency converter operates as a new main frequency converter, and the like. When communication failure occurs, the slave is stopped by default, and the master machine can continue to operate with the rest slave machines without the communication failure in an on-load mode.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
As shown in fig. 1A, a method for controlling thermal redundancy of a frequency converter according to an embodiment of the present invention is applied to a redundant frequency converter device, where the redundant frequency converter device includes a master frequency converter and M slave frequency converters, the master frequency converter and each slave frequency converter are connected in parallel, the master frequency converter is connected to each slave frequency converter in a communication manner, and the method includes:
s101, in normal operation, the main frequency converter controls the main frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm;
s102, if the main frequency converter has a local fault, the main frequency converter controls the main frequency converter to exit the redundant frequency converter device, and the M slave frequency converters with the largest or smallest identification numbers control the main frequency converter to operate as a new main frequency converter;
and S103, the new master frequency converter controls the new master frequency converter to normally operate according to a current sharing control algorithm with the slave frequency converters except the new master frequency converter in the M slave frequency converters, wherein the new master frequency converter is in communication connection with the slave frequency converters except the new master frequency converter in the M slave frequency converters.
Wherein M is an integer of 1 or more.
The voltage class of the redundant frequency converter device can be 6kV, 10kV, 35kV, 110kV, 220kV and the like, a respective control system is arranged in each of the main frequency converter and the slave frequency converter, the main frequency converter controls the main frequency converter and the slave frequency converter according to the control logic of the control system, and the slave frequency converter controls the action of the slave frequency converter according to the control logic of the control system. Data are transmitted between the main frequency converter and each slave frequency converter through double-path redundant optical fiber communication for current sharing control and logic protection processing, and similarly, double-path redundant communication optical fibers are also arranged between every two slave frequency converters. The new master frequency converter can be generated from a plurality of original slave frequency converters, can be generated through competition, and can also be generated by adopting the sequencing of identification numbers.
For example, the redundant frequency converter arrangement comprises 3 frequency converters, or the redundant frequency converter arrangement comprises 2 frequency converters. Taking the example that the redundant frequency converter device includes 3 frequency converters, it is assumed that the id numbers of the 3 frequency converters are 1#, 2#, and 3#, respectively.
In step S101, for example, during normal operation, the 1# frequency converter serves as a master frequency converter, the 2# frequency converter and the 3# frequency converter serve as slave frequency converters, and the 1# frequency converter, the 2# frequency converter and the 3# frequency converter are controlled to operate normally according to a current sharing control algorithm, and at this time, the 1# frequency converter, the 2# frequency converter and the 3# frequency converter operate with 100% load.
After the step S101, step S102 is executed, if the main frequency converter has a local fault, the main frequency converter controls itself to exit the redundant frequency converter device, and the slave frequency converters with the largest or smallest identity identification numbers in the M slave frequency converters control itself to operate as a new main frequency converter.
Still following the foregoing example, if the 1# converter has a local failure, e.g., the 1# converter detects a local failure of itself, the 1# converter controls itself to exit the redundant converter apparatus. At this time, the slave frequency converter with the smallest identification number (or the largest identification number) in the slave frequency converter controls the slave frequency converter to operate as a new master frequency converter, namely, the 2# frequency converter controls the slave frequency converter to operate as a new master frequency converter.
After the step S102 is executed, continuing to execute step S103, specifically, the new master frequency converter controls itself and the remaining slave frequency converters except the new master frequency converter in the M slave frequency converters to normally operate according to a current sharing control algorithm, where the new master frequency converter and the remaining slave frequency converters except the new master frequency converter in the M slave frequency converters are in communication connection.
Still continuing the previous example, the 2# converter is used as a new main converter to control itself and the 3# converter operates normally according to the current sharing control algorithm, and at this time, the 2# converter is used as a new main converter and the 3# converter operates with 100% load.
After performing step S101, the method further includes:
if the local fault occurs to N slave frequency converters in the M slave frequency converters, the N slave frequency converters respectively control the N slave frequency converters to quit the redundant frequency converter device, wherein N is an integer which is more than or equal to 1 and less than or equal to M;
and the main frequency converter controls the main frequency converter and the slave frequency converters without local faults in the M slave frequency converters to normally operate according to a current sharing control algorithm.
Still continuing with the foregoing example, the 2# converter detects that the local machine has a fault, the 2# converter controls itself to exit, at this time, the 1# converter controls itself and the 3# converter to operate normally according to the current sharing algorithm, and at this time, the 1# converter and the 3# converter operate with 100% load.
After performing step S101, the method further includes:
when communication failure occurs between the main frequency converter and at least one slave frequency converter in the M slave frequency converters, the slave frequency converter which has communication failure with the main frequency converter controls the slave frequency converter to exit the redundant frequency converter device;
and the master frequency converter controls the slave frequency converter without communication fault with the master frequency converter to normally operate according to a current sharing control algorithm.
Following the foregoing example, a communication failure occurs between the 1# converter and the 2# converter, for example, the 2# converter detects a communication failure between itself and the 1# converter, and the 2# converter controls itself to exit the redundant converter device. The 1# frequency converter controls the self frequency converter and the 3# slave frequency converter to normally operate according to a current sharing algorithm, and at the moment, the 1# frequency converter and the 3# frequency converter operate with 100% load.
After performing step S101, the method further includes:
when a frequency converter to be cut in needs to be cut in the redundant frequency converter device, a main frequency converter in normal operation sends operation information of the main frequency converter in normal operation to the frequency converter to be cut in, so that the frequency converter to be cut in serves as a slave frequency converter to be cut in the redundant frequency converter device based on the operation information;
and the main frequency converter in normal operation controls the main frequency converter, the switched-in frequency converter to be switched in and the M auxiliary frequency converters to normally operate according to a current sharing control algorithm.
By using the foregoing example, assuming that the 2# frequency converter detects that the frequency converter itself has a local fault, the 2# frequency converter controls itself to exit the redundant frequency converter device, at this time, the 1# frequency converter controls itself and the 3# frequency converter to operate normally according to the current sharing algorithm, and at this time, the 1# frequency converter and the 3# frequency converter operate with 100% load.
At this time, if the local fault of the 2# converter is eliminated (or the communication fault between the 2# converter and the host is eliminated), and the 2# converter is used as a converter to be cut in and needs to be cut into the redundant converter device, the 2# converter sends information requesting cut-in to the 1# converter, and the 1# converter sends its own operation information to the 2# converter, so that the 2# converter can select an appropriate timing to be cut into the redundant converter device according to the operation information, wherein the operation information is, for example, the wave information of the 1# converter, and the wave information may include the voltage and phase information of the power sent by the 1# converter.
Alternatively, in addition to the frequency converter with the local fault or the communication fault, a new frequency converter may need to be switched into a redundant frequency converter device for operation, for example, a 4# frequency converter, a 5# frequency converter, etc.
Taking the example that the redundant frequency converter apparatus shown in fig. 1B includes two frequency converters capable of operating independently, the method for controlling thermal redundancy of a frequency converter according to this embodiment is further described, and the method is specifically shown in fig. 2:
for example, as shown in fig. 2, the redundant inverter device includes two 1# inverters and 2# inverters capable of operating independently, input ends of the two inverters are connected to a 10kV ac bus through input breakers QF1 and QF3, respectively, the two inverters are 10kV inverters, the default 1# inverter is a master (master inverter), and the default 2# inverter is a slave (slave inverter). Each frequency converter is provided with an input breaker (QF1 and QF3), an output breaker (QF2 and QF4) and an inductor (inductor 1 and inductor 2), wherein the inductor 1 and the inductor 2 can be two independent inductors without coupling relation, and can also be a coupling inductor comprising the inductor 1 and the inductor 2. The two frequency converters are provided with respective control systems, and data are transmitted through two-way redundant optical fiber communication for current sharing control and logic protection processing; the input of the two frequency converters is independent, the output passes through respective inductors and respective output breakers and then is connected in parallel, and the output parallel mode is as follows: the U phase of the 1# frequency converter and the U phase of the 2# frequency converter are connected in parallel and then connected to the U phase input of the motor, the V phase of the 1# frequency converter and the V phase of the 2# frequency converter are connected in parallel and then connected to the V phase input of the motor, and the W phase of the 1# frequency converter and the W phase of the 2# frequency converter are connected in parallel and then connected to the W phase input of the motor. The output ends of the two frequency converters are connected in parallel and then connected with a load M.
Under the condition of no fault, two frequency converters in the system provide required power for the load together through a current sharing control algorithm, for example, the two frequency converters are respectively provided with 50% of load and are in a redundant loaded operation mode, when one frequency converter is stopped due to any fault, the frequency converter exits from the system, the system is switched to a single loaded operation mode, and circuit breakers in front of and behind the fault frequency converter can be selected to be disconnected when the frequency converter exits from the system; when the redundant optical fiber communication fails, the default slave computer exits the system, the host computer runs under load, and the operation mode is switched to a single load running mode.
The software flow for the two frequency converters with their respective control systems running in hot redundancy is shown in fig. 2 (the flow chart in fig. 2 is only an exemplary one and should not be taken as a limitation to the scope of the present invention):
for the 1# frequency converter, the hot redundancy operation software flow in the control system is as follows:
s201, judging whether the host is the host or not; when yes, S2021 is performed;
s2021, judging whether communication faults exist; namely, whether a communication fault occurs between the frequency converter and the 2# frequency converter is judged, and if yes, S2022 is executed;
and S2022, stopping sending the information to the slave machines and operating the single master machine.
And S2023, communication fault warning.
S2024, judging whether the machine has a fault. When yes, S2025 is performed. When no, S2026 is executed.
S2025, stopping and exiting the system
S2026 judges whether or not the slave has a failure, and if yes, S2027 is executed, and if no, S2028 is executed.
And S2027, stopping sending the information to the slave machines and operating the single master machine.
And S2028, sending the operation information to the slave.
S2029, executing a host hot redundancy current sharing control algorithm. The master controls itself and the slaves to operate with 100% load.
For the 2# frequency converter, the hot redundancy operation software flow in the control system is as follows:
s201, judging whether the host is the host or not; if yes, S2031 is executed;
s2031, judging whether communication fault occurs; namely, whether a communication fault occurs between the converter and the 1# frequency converter is judged, and if yes, S2032 is executed; if no, S2034 is executed.
And S2032, stopping the system and quitting the system.
And S2033, communication fault warning.
S2034, whether the self of the machine has a fault or not. If yes, S2035 is executed. If no, S2036 is executed.
S2035, stopping the machine and quitting the system
S2036 is a process for determining whether the host computer has failed, and if yes, S2037 is executed, and if no, S2038 is executed.
S2037, the information of the host is not responded, the information input by the user is received, and the single slave computer is used as the host to operate.
S2038, receiving the operation information sent by the host.
And S2039, executing a slave hot redundancy current sharing control algorithm.
If there are multiple slaves, the software execution flow principle of the control system in each slave is the same, and is not described herein again. In the above steps S2036 and S2037, when there are a plurality of slaves, the slave with the largest or smallest id number among the slaves operates as the master and communicates with the remaining slaves.
As shown in fig. 3, when the failed frequency converter is repaired or communication is recovered, a user may select to switch the shutdown frequency converter into the system online, and the system is switched from the single operation mode to the redundant operation mode. If the fault frequency converter can be repaired in a short time, the online cut-in function can greatly improve the reliability of the thermal redundancy control system, and the online cut-in function is only used for illustration and is not used for limiting the protection scope of the invention.
Specifically, for example, the 1# inverter operates alone as a master. And (5) after the fault of the 2# frequency converter is repaired.
For the 1# frequency converter, the hot redundancy operation software flow in the control system is as follows:
s301, judging whether the frequency converter needs online cut-in, if so, executing S302.
S302, whether the system has no fault and the communication is normal or not is judged, and if so, S303 is executed.
S303, whether the machine needs to be switched into the system, if not, S3041.
S3041, sending wave-sending information to a frequency converter to be cut in. The frequency converter to be cut in is a 2# frequency converter, wherein the wave-transmitting information comprises information such as voltage and phase of electric power transmitted by the host machine.
And S3051, judging whether the cut-in is finished. Namely, whether the 2# frequency converter is switched in is judged. If yes, S3081 is performed.
S3081, executing a host hot redundancy current sharing control algorithm. The 1# frequency converter is used as a host to control the 2# frequency converter to operate together with 100% load.
For the 2# frequency converter, the hot redundancy operation software flow in the control system is as follows:
s301, judging whether the frequency converter needs online cut-in, if so, executing S302.
S302, whether the system has no fault and the communication is normal or not is judged, and if so, S303 is executed.
S303, whether the machine needs to be switched into the system or not, if so, S3042.
S3042, the wave information of the running host is acquired. The wave information includes information such as voltage and phase of the power generated by the host.
And S3052, judging whether the self meets the cut-in condition. If yes, S3062 is executed.
S3062, the machine is operated according to the wave sending information of the host in operation. A
S3072, whether the cut-in is successful is judged. If no, S3052 is performed, and if yes,
and S3082, executing a slave hot redundancy current sharing control algorithm.
According to the actual application requirement, in the hot redundancy operation software process, it may also be determined whether the frequency converter has a fault, and then, it may determine a communication fault, etc. the hot redundancy operation software process is merely to further illustrate the embodiment of the present invention, and is not to be taken as a limitation to the specific implementation of the present invention.
As shown in fig. 4, a second embodiment of the present invention provides a redundant frequency converter device, where the redundant frequency converter device includes a master frequency converter and M slave frequency converters, the master frequency converter and each slave frequency converter are connected in parallel, and the master frequency converter is connected to each slave frequency converter in a communication manner;
in normal operation, the master frequency converter is used for controlling the master frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm;
if the main frequency converter has a local fault, the main frequency converter is used for controlling the main frequency converter to exit the redundant frequency converter device, and the slave frequency converters with the largest or smallest identity identification numbers in the M slave frequency converters control the main frequency converter to operate as a new main frequency converter;
and the new main frequency converter is used for controlling the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters to normally operate according to a current sharing control algorithm, wherein the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters are in communication connection.
In fig. 4, the redundant frequency converter device includes a master frequency converter and M slave frequency converters, where M is an integer greater than or equal to 1.
The voltage class of the redundant frequency converter device can be 6kV, 10kV, 35kV, 110kV, 220kV and the like, a respective control system is arranged in each of the main frequency converter and the slave frequency converter, the main frequency converter controls the main frequency converter and the slave frequency converter according to the control logic of the control system, and the slave frequency converter controls the action of the slave frequency converter according to the control logic of the control system. Data are transmitted between the main frequency converter and each slave frequency converter through double-path redundant optical fiber communication for current sharing control and logic protection processing, and similarly, double-path redundant communication optical fibers are also arranged between every two slave frequency converters. The new master frequency converter can be generated from a plurality of original slave frequency converters, can be generated through competition, and can also be generated by adopting the sequencing of identification numbers.
For example, the redundant frequency converter arrangement comprises 3 frequency converters, or the redundant frequency converter arrangement comprises 2 frequency converters. Taking the example that the redundant frequency converter device includes 3 frequency converters, it is assumed that the id numbers of the 3 frequency converters are 1#, 2#, and 3#, respectively.
The method steps of the working principle of the redundant frequency converter device are the same as those of the frequency converter thermal redundancy control method applied to the redundant frequency converter device in the first embodiment, and are not described again here.
Based on the above first and second embodiments, the following variations are possible:
for the main topological structure of the redundant frequency converter device, a plurality of frequency converters (more than two frequency converters) can be connected in parallel for output; the input is, for example, 6KV, and the input of each frequency converter can come from different buses; the output may use a coupled inductor; the output of each frequency converter can pass through a breaker and then an inductor; the circuit breaker may also be a contactor; other communication schemes are possible among the frequency converters, but all the schemes are used for realizing data interaction current sharing control.
In terms of control strategy, in operation, the output power or current of each frequency converter in the system can be different, but the current or power needs to be controlled by an algorithm; when communication failure occurs in the system, the master machine can be stopped, and the slave machine runs under load. But when one frequency converter in the system exits the system, the rest frequency converters can normally run with 100% load without speed reduction and derating.
In addition, the current sharing control algorithm mentioned in the above embodiment may be any current sharing control algorithm that can be applied to the redundant frequency converter device in the prior art, and is not described herein again.
A third embodiment of the present invention provides a computer apparatus, which includes a processor, and the processor is configured to implement the steps of the method according to the first embodiment when executing the computer program stored in the memory.
A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the method according to the first embodiment.
The technical scheme in the embodiment of the invention at least has the following technical effects or advantages:
by adopting the technical scheme provided by the embodiment of the invention, each frequency converter meets the capability of single full-load operation, when any fault occurs to one frequency converter in the system, the frequency converter exits the system, the other frequency converters continue to operate, the load is not influenced, the frequency converter can operate at full speed and full load, if the main frequency converter fails, the slave frequency converter with the largest or smallest identification number in the slave frequency converter without communication fault with the main frequency converter operates as a new main frequency converter, and the like. When communication failure occurs, the slave is stopped by default, and the master machine can continue to operate with the rest slave machines without the communication failure in an on-load mode.
The technical scheme provided by the embodiment of the invention has an online cut-in function, when a fault frequency converter is repaired or a communication fault is repaired, the frequency converter which is shut down can be selected to be cut into the system, and after the system receives an online cut-in command, the frequency converter which is shut down can be automatically cut into the system to run.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A frequency converter thermal redundancy control method is applied to a redundancy frequency converter device, the redundancy frequency converter device comprises a main frequency converter and M auxiliary frequency converters, the main frequency converter and each auxiliary frequency converter are connected in parallel, the main frequency converter is respectively in communication connection with each auxiliary frequency converter, M is an integer greater than or equal to 1, and the method comprises the following steps:
in normal operation, the main frequency converter controls the main frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm;
if the main frequency converter has a local fault, the main frequency converter controls the main frequency converter to exit the redundant frequency converter device, and the slave frequency converter with the largest or smallest identity identification number in the M slave frequency converters controls the main frequency converter to operate as a new main frequency converter;
and the new main frequency converter controls the main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters to normally operate according to a current sharing control algorithm, wherein the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters are in communication connection.
2. The method of claim 1, wherein after the master frequency converter, the controller itself and each slave frequency converter normally operate according to a current sharing control algorithm, the method further comprises:
if the local fault occurs to N slave frequency converters in the M slave frequency converters, the N slave frequency converters respectively control the N slave frequency converters to quit the redundant frequency converter device, wherein N is an integer which is more than or equal to 1 and less than or equal to M;
and the main frequency converter controls the main frequency converter and the slave frequency converters without local faults in the M slave frequency converters to normally operate according to a current sharing control algorithm.
3. The method of claim 1, wherein after the master frequency converter, the controller itself and each slave frequency converter normally operate according to a current sharing control algorithm, the method further comprises:
when communication failure occurs between the main frequency converter and at least one slave frequency converter in the M slave frequency converters, the slave frequency converter which has communication failure with the main frequency converter controls the slave frequency converter to exit the redundant frequency converter device;
and the master frequency converter controls the slave frequency converter without communication fault with the master frequency converter to normally operate according to a current sharing control algorithm.
4. The method of any one of claims 1-3, wherein after the master frequency converter, the controller itself, and each of the slave frequency converters are operating normally according to a current sharing control algorithm, the method further comprises:
when a frequency converter to be cut in needs to be cut in the redundant frequency converter device, a main frequency converter in normal operation sends operation information of the main frequency converter in normal operation to the frequency converter to be cut in, so that the frequency converter to be cut in serves as a slave frequency converter to be cut in the redundant frequency converter device based on the operation information;
and the main frequency converter in normal operation controls the main frequency converter, the switched-in frequency converter to be switched in and the M auxiliary frequency converters to normally operate according to a current sharing control algorithm.
5. A redundant frequency converter device is characterized by comprising a main frequency converter and M auxiliary frequency converters, wherein the main frequency converter and each auxiliary frequency converter are connected in parallel, the main frequency converter is respectively in communication connection with each auxiliary frequency converter, and M is an integer greater than or equal to 1;
in normal operation, the master frequency converter is used for controlling the master frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm;
if the main frequency converter has a local fault, the main frequency converter is used for controlling the main frequency converter to exit the redundant frequency converter device, and the slave frequency converters with the largest or smallest identity identification numbers in the M slave frequency converters control the main frequency converter to operate as a new main frequency converter;
and the new main frequency converter is used for controlling the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters to normally operate according to a current sharing control algorithm, wherein the new main frequency converter and the other auxiliary frequency converters except the new main frequency converter in the M auxiliary frequency converters are in communication connection.
6. The apparatus of claim 5, wherein:
after the main frequency converter and each slave frequency converter normally operate according to a current sharing control algorithm, if a local fault occurs in N slave frequency converters in the M slave frequency converters, the N slave frequency converters are used for respectively controlling the main frequency converter to quit the redundant frequency converter device, wherein N is an integer greater than or equal to 1 and less than or equal to M;
and the main frequency converter is used for controlling the main frequency converter and the slave frequency converters without local faults in the M slave frequency converters to normally operate according to a current sharing control algorithm.
7. The apparatus of claim 6, wherein:
after the main frequency converter controls the main frequency converter and each slave frequency converter to normally operate according to a current sharing control algorithm, when a communication fault occurs between the main frequency converter and at least one slave frequency converter in the M slave frequency converters, the slave frequency converter which has the communication fault with the main frequency converter is used for controlling the main frequency converter to quit the redundant frequency converter device;
and the master frequency converter controls the slave frequency converter without communication fault with the master frequency converter to normally operate according to a current sharing control algorithm.
8. The apparatus of any one of claims 5-7, wherein:
after the master frequency converter and each slave frequency converter are controlled to normally operate according to a current sharing control algorithm, when a frequency converter to be switched in needs to be switched into the redundant frequency converter device, the master frequency converter in normal operation sends operation information of the master frequency converter in normal operation to the frequency converter to be switched in, so that the frequency converter to be switched in is switched into the redundant frequency converter device as a slave frequency converter based on the operation information;
and the main frequency converter in normal operation controls the main frequency converter, the switched-in frequency converter to be switched in and the M auxiliary frequency converters to normally operate according to a current sharing control algorithm.
9. A computer arrangement, characterized in that the arrangement comprises a processor for implementing the steps of the method according to any of claims 1-4 when executing a computer program stored in a memory.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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| CN110190668B (en) * | 2019-05-29 | 2021-02-12 | 北京动力源科技股份有限公司 | Hot standby speed regulation power supply system |
| CN110995087A (en) * | 2019-12-29 | 2020-04-10 | 徐州中矿大传动与自动化有限公司 | Power balance control method and device for multi-motor cluster system |
| CN111030513A (en) * | 2019-12-29 | 2020-04-17 | 徐州中矿大传动与自动化有限公司 | Fault state redundancy switching control method and device for multi-motor cluster system |
| CN112532118B (en) * | 2020-11-11 | 2022-08-19 | 上海辛格林纳新时达电机有限公司 | Frequency converter multi-machine synchronous control system and control method |
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