CN107623330B - Control method of valve base control system - Google Patents
Control method of valve base control system Download PDFInfo
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- CN107623330B CN107623330B CN201710753767.5A CN201710753767A CN107623330B CN 107623330 B CN107623330 B CN 107623330B CN 201710753767 A CN201710753767 A CN 201710753767A CN 107623330 B CN107623330 B CN 107623330B
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Abstract
A method of controlling a valve base control system, comprising: judging whether the first bridge arm current control unit and the second bridge arm current control unit are in normal communication with a pole control system respectively; when the first bridge arm current control unit is normally communicated with the pole control system and the second bridge arm current control unit is normally communicated with the pole control system, judging whether the first bridge arm current control unit is normally communicated with the second bridge arm current control unit; when the first bridge arm current control unit and the second bridge arm current control unit are in normal communication, a first switching signal sent by a pole control system and received by the first bridge arm current control unit and a second switching signal sent by the pole control system and received by the second bridge arm current control unit are obtained; judging whether the first switching signal is the same as the second switching signal; when the first switching signal is the same as the second switching signal, a first instruction to retransmit the first switching signal and the second switching signal is issued to the pole control unit.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission, in particular to a control method of a valve base control system.
Background
The flexible direct-current transmission is used as a new generation of direct-current transmission technology, has the advantages of high controllability and good flexibility, and has remarkable technical advantages in the aspects of renewable energy source grid connection, large-scale urban power supply and construction of future direct-current power grids. The valve base control system (VBC) is an intermediate link of the flexible direct current transmission control system. In terms of functions, the VBC is a middle junction connecting a top-layer pole control system (PCP) and a bottom-layer switching device controller (SMC), plays roles in circulating current suppression, sub-module voltage balance, sub-module control, monitoring protection and the like, and is a core device of the flexible direct-current transmission converter valve. Therefore, the stable and reliable operation of the valve base control system plays a crucial role in the whole flexible direct current transmission system;
in order to improve the operation stability and reliability of the VBC, the VBC adopts ｃA layered segmented control framework with double redundancy backup, as shown in figure 1, the VBC is sequentially divided into three layers of control units from top to bottom, the three layers of control units are respectively ｃA first bridge arm current control unit A and ｃA second bridge arm current control unit B with double redundancy, ｃA bridge arm summary control unit A, B with double redundancy and ｃA plurality of bridge arm segmented control units 01, 02, 03 and 04 with ｃA double redundancy core board A, B, the control units are connected through optical fibers, the bridge arm current control unit A is connected with ｃA superior pole control unit PCP-A system, the bridge arm current control unit B is connected with the superior pole control unit PCP-B system, through the arranged double redundancy system, when the working system A has ｃA fault, ｃA switching signal is sent through the superior pole control system, the backup system B is put into use, because the existing valve base control system only puts into different working systems through ｃA switching command given by the superior pole control system, when communication faults and other problems occur between the pole control system and the valve base control system, effective switching signals cannot be timely carried out on the valve base control system, the bridge arm subsection control unit at the bottommost layer of the valve base control system receives action signals sent by the bridge arm current control unit, communication faults also occur, and due to the fact that fault diagnosis and switching cannot be carried out, when external or internal communication faults occur in the valve base control system, the working stability and reliability of the valve base control system are reduced.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is the problem that the existing valve base control mode is low and stable.
In view of the above, the present invention provides a control method of a valve base control system, including:
judging whether the first bridge arm current control unit and the second bridge arm current control unit are in normal communication with a pole control system respectively;
when the first bridge arm current control unit is normally communicated with the pole control system and the second bridge arm current control unit is normally communicated with the pole control system, judging whether the first bridge arm current control unit is normally communicated with the second bridge arm current control unit;
when the first bridge arm current control unit and the second bridge arm current control unit are in normal communication,
acquiring a first switching signal sent by the pole control system and received by the first bridge arm current control unit and a second switching signal sent by the pole control system and received by the second bridge arm current control unit;
determining whether the first switching signal and the second switching signal are the same,
when the first switching signal is the same as the second switching signal, a first instruction to retransmit the first switching signal and the second switching signal is issued to the pole control unit.
Preferably, the first switching signal and the second switching signal respectively include a positive switching signal and a negative switching signal, the positive switching signal is used for controlling the bridge arm current control unit to enter a working state, and the negative switching signal is used for controlling the bridge arm current control unit to enter a standby state.
Preferably, the method further comprises the following steps: and when the first switching signal is different from the second switching signal, the first switching signal and the second switching signal are sent to the bridge arm section control unit through the bridge arm summary control unit.
Preferably, the method further comprises the following steps:
and when the first bridge arm current control unit is in normal communication with the pole control system, the second bridge arm current control unit is in normal communication with the pole control system, and the first bridge arm current control unit is in abnormal communication with the second bridge arm current control unit, sending a second instruction for retransmitting the first switching signal and the second switching signal to the pole control unit.
Preferably, the method further comprises the following steps:
when the first bridge arm current control unit is abnormally communicated with a pole control system and the second bridge arm current control unit is normally communicated with the pole control system and the first bridge arm current control unit is normally communicated with the second bridge arm current control unit, judging whether the second switching signal is the normal switching signal;
and when the second switching signal is the positive switching signal, sending an alarm instruction to the pole control unit.
Preferably, the method further comprises the following steps:
judging whether the second switching signal is the negative switching signal;
and when the second switching signal is the negative switching signal, sending a third instruction for retransmitting the first switching signal and the second switching signal to the pole control unit.
Preferably, the method further comprises the following steps: and when the communication between the first bridge arm current control unit and the pole control system is abnormal, the communication between the second bridge arm current control unit and the pole control system is abnormal, and the communication between the first bridge arm current control unit and the second bridge arm current control unit is normal, sending a fourth instruction for retransmitting the first switching signal and the second switching signal to the pole control unit.
Preferably, after the step of sending the first switching signal and the second switching signal to the bridge arm segment control unit through the bridge arm summary control unit, the method includes:
judging whether the first switching signal and the second switching signal received by the two core boards of the bridge arm section control unit are the same or not;
and when the received first switching signal and the second switching signal are the same, controlling the core board to maintain the current working state.
Preferably, when the received first switching signal and the second switching signal are different, the core board is controlled to operate according to the first switching signal and the second switching signal.
Preferably, before the step of determining whether the communications between the first bridge arm current control unit and the pole control system and the communications between the second bridge arm current control unit and the pole control system are normal, the method includes:
judging whether the valve base control system has a fault or not;
and when the valve base control system has a fault, controlling the valve base control system to send a command for requesting a switching signal to the pole control system.
Preferably, the step of determining whether the valve base control system is faulty includes:
carrying out continuous judgment on faults occurring in the valve base control system;
and when the continuous judgment times are larger than the preset times, judging that the valve base control system has a fault.
According to the control method of the valve base control system, when the first bridge arm current control unit is normally communicated with the pole control system, the second bridge arm current control unit is normally communicated with the pole control system, and when the first bridge arm current control unit is normally communicated with the second bridge arm current control unit, a first switching signal sent by the pole control system and received by the first bridge arm current control unit and a second switching signal sent by the pole control system and received by the second bridge arm current control unit are obtained, and when the first switching signal is the same as the second switching signal, a first instruction for retransmitting the first switching signal and the second switching signal is sent to the pole control unit, so that the problem that the existing valve base control mode is low in stability is solved.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic block diagram of a valve base control system according to another embodiment of the present invention;
fig. 2 is a flowchart of a control method of a valve base control system according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 of the invention provides a control method of a valve base control system, which is applied to the valve base control system with a dual-redundancy bridge arm control unit, and as shown in fig. 2, the control method comprises the following steps:
and S11, judging whether the communication between the first bridge arm current control unit and the pole control system is normal or not, and executing the step S12 when the communication between the first bridge arm current control unit and the pole control system is normal and the communication between the second bridge arm current control unit and the pole control system is normal, wherein the number of the pole control systems can be two, the first pole control system is connected with the first bridge arm current control unit, and the second pole control system is connected with the second bridge arm current control unit.
And S12, judging whether the communication between the first bridge arm current control unit and the second bridge arm current control unit is normal, and executing the step S13 when the communication between the first bridge arm current control unit and the second bridge arm current control unit is normal.
S13, acquiring a first switching signal sent by the pole control system and received by the first bridge arm current control unit and a second switching signal sent by the pole control system and received by the second bridge arm current control unit; the first switching signal and the second switching signal may be a positive switching signal for controlling the bridge arm current control unit to enter the working state and a negative switching signal for controlling the bridge arm current control unit to enter the standby state, respectively.
S14, determining whether the first switching signal is the same as the second switching signal, and if the first switching signal is the same as the second switching signal, executing step S15. For example, when the first switching signal and the second switching signal are both positive switching signals, it indicates that both the first bridge arm current control unit and the second bridge arm current control unit need to enter a working state, whereas when both the first bridge arm current control unit and the second bridge arm current control unit need to enter a standby state, and since only one system needs to work in the valve base control system at any time, both the first bridge arm current control unit and the second bridge arm current control unit are wrong redundant control signals.
S15, a first instruction is issued to the pole control unit to retransmit the first switching signal and the second switching signal. The first instruction may comprise information of the current error signal, e.g. indicating that two positive switching signals or two negative switching signals are currently present, and then requesting the pole control unit to retransmit.
And S16, when the first switching signal is different from the second switching signal, sending the first switching signal and the second switching signal to the bridge arm section control unit through the bridge arm summary control unit.
According to the control method of the valve base control system provided by the embodiment of the invention, when the communication between the first bridge arm current control unit and the pole control system is normal, the communication between the second bridge arm current control unit and the pole control system is normal, and when the communication between the first bridge arm current control unit and the second bridge arm current control unit is normal, the first switching signal sent by the pole control system and received by the first bridge arm current control unit and the second switching signal sent by the pole control system and received by the second bridge arm current control unit are obtained, and when the first switching signal is the same as the second switching signal, the first instruction for retransmitting the first switching signal and the second switching signal is sent to the pole control unit, so that the problem that the existing valve base control mode is low in stability is solved.
Preferably, after the step of sending the first switching signal and the second switching signal to the bridge arm segment control unit through the bridge arm summary control unit, the method includes:
judging whether the first switching signal and the second switching signal received by the two core boards of the bridge arm section control unit are the same or not;
and when the received first switching signal and the second switching signal are the same, controlling the core board to maintain the current working state.
Preferably, when the received first switching signal and the second switching signal are different, the core board is controlled to operate according to the first switching signal and the second switching signal.
Before determining whether the communications between the first bridge arm current control unit and the pole control system and between the second bridge arm current control unit and the pole control system are normal in step S11, the method includes:
firstly, judging whether the valve base control system has a fault;
and secondly, when the valve base control system has a fault, controlling the valve base control system to send a command for requesting a switching signal to the pole control system.
In order to avoid that the valve base control system sends out an error fault request instruction, the step of judging whether the valve base control system has a fault comprises the following steps:
firstly, continuously judging faults occurring in the valve base control system;
and secondly, when the continuous judgment times are larger than the preset times, judging that the valve base control system has a fault. In this embodiment, it is preferable that the preset number of consecutive judgment is 5, and when the number of consecutive judgment is greater than 5, it is determined that a fault occurs.
The method further comprises the following steps: and when the first bridge arm current control unit is in normal communication with the pole control system, the second bridge arm current control unit is in normal communication with the pole control system, and the first bridge arm current control unit is in abnormal communication with the second bridge arm current control unit, sending a second instruction for retransmitting the first switching signal and the second switching signal to the pole control unit. The first bridge arm current control unit and the second bridge arm current control unit are in communication through optical fibers, when an optical fiber communication fault occurs, the first bridge arm current control unit and the second bridge arm current control unit cannot determine the switching signals received between the first bridge arm current control unit and the second bridge arm current control unit, for safety, a second instruction of the retransmitted switching signals is sent to the pole control unit and contains fault information, and then the fault is subjected to a valve base monitoring system, so that the fault is convenient to clear in time.
The method further comprises the following steps:
firstly, when a first bridge arm current control unit is abnormally communicated with a pole control system and a second bridge arm current control unit is normally communicated with the pole control system, and the first bridge arm current control unit is normally communicated with the second bridge arm current control unit, judging whether a second switching signal is the normal switching signal;
and secondly, when the second switching signal is the positive switching signal, sending an alarm instruction to the pole control unit. The alarm instruction indicates that the current valve, i.e., the control system, can only maintain short-time operation and is not suitable for long-term operation.
The method further comprises the following steps:
firstly, judging whether the second switching signal is the negative switching signal;
next, when the second switching signal is the negative switching signal, a third instruction to retransmit the first switching signal and the second switching signal is issued to the pole control unit.
The method further comprises the following steps: and when the communication between the first bridge arm current control unit and the pole control system is abnormal, the communication between the second bridge arm current control unit and the pole control system is abnormal, and the communication between the first bridge arm current control unit and the second bridge arm current control unit is normal, sending a fourth instruction for retransmitting the first switching signal and the second switching signal to the pole control unit.
According to the control method of the valve base control system provided by the embodiment of the invention, when the communication between the first bridge arm current control unit and the pole control system is normal, the communication between the second bridge arm current control unit and the pole control system is normal, and when the communication between the first bridge arm current control unit and the second bridge arm current control unit is normal, the first switching signal sent by the pole control system and received by the first bridge arm current control unit and the second switching signal sent by the pole control system and received by the second bridge arm current control unit are obtained, and when the first switching signal is the same as the second switching signal, the first instruction for retransmitting the first switching signal and the second switching signal is sent to the pole control unit, so that the problem that the existing valve base control mode is low in stability is solved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A method of controlling a valve base control system, comprising:
judging whether the first bridge arm current control unit and the second bridge arm current control unit are in normal communication with a pole control system respectively;
when the first bridge arm current control unit is normally communicated with the pole control system and the second bridge arm current control unit is normally communicated with the pole control system, judging whether the first bridge arm current control unit is normally communicated with the second bridge arm current control unit;
when the first bridge arm current control unit and the second bridge arm current control unit are in normal communication, a first switching signal sent by the pole control system and received by the first bridge arm current control unit and a second switching signal sent by the pole control system and received by the second bridge arm current control unit are obtained;
judging whether the first switching signal is the same as the second switching signal;
when the first switching signal is the same as the second switching signal, a first instruction to retransmit the first switching signal and the second switching signal is issued to the pole control system.
2. The method according to claim 1, wherein the first switching signal and the second switching signal respectively comprise a positive switching signal and a negative switching signal, the positive switching signal is used for controlling the bridge arm current control unit to enter the working state, and the negative switching signal is used for controlling the bridge arm current control unit to enter the standby state.
3. The method of claim 1, further comprising: and when the first switching signal is different from the second switching signal, the first switching signal and the second switching signal are sent to the bridge arm section control unit through the bridge arm summary control unit.
4. The method of claim 1, further comprising:
and when the first bridge arm current control unit is in normal communication with the pole control system, the second bridge arm current control unit is in normal communication with the pole control system, and the first bridge arm current control unit is in abnormal communication with the second bridge arm current control unit, sending a second instruction for retransmitting the first switching signal and the second switching signal to the pole control system.
5. The method of claim 2, further comprising:
when the first bridge arm current control unit is abnormally communicated with a pole control system and the second bridge arm current control unit is normally communicated with the pole control system and the first bridge arm current control unit is normally communicated with the second bridge arm current control unit, judging whether the second switching signal is the normal switching signal;
and when the second switching signal is the positive switching signal, sending an alarm instruction to the pole control system.
6. The method of claim 5, further comprising:
judging whether the second switching signal is the negative switching signal;
and when the second switching signal is the negative switching signal, sending a third instruction for retransmitting the first switching signal and the second switching signal to the pole control system.
7. The method of claim 3, wherein the step of sending the first switching signal and the second switching signal to the bridge leg segmentation control unit through the bridge leg summary control unit comprises:
judging whether the first switching signal and the second switching signal received by the two core boards of the bridge arm section control unit are the same or not;
and when the received first switching signal and the second switching signal are the same, controlling the core board to maintain the current working state.
8. The method of claim 7, wherein when the received first switching signal and the second switching signal are not the same, the core board is controlled to be operated according to the first switching signal and the second switching signal.
9. The method according to claim 6, wherein before the step of determining whether the communications between the first bridge arm current control unit and the pole control system and the communications between the second bridge arm current control unit and the pole control system are normal, the method comprises:
judging whether the valve base control system has a fault or not;
and when the valve base control system has a fault, controlling the valve base control system to send a command for requesting a switching signal to the pole control system.
10. The method of claim 9, wherein the step of determining whether the valve base control system is malfunctioning comprises:
carrying out continuous judgment on faults occurring in the valve base control system;
and when the continuous judgment times are larger than the preset times, judging that the valve base control system has a fault.
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| CN201710753767.5A CN107623330B (en) | 2017-08-29 | 2017-08-29 | Control method of valve base control system |
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| CN111181190B (en) * | 2020-01-15 | 2021-12-24 | 许继集团有限公司 | Direct-current converter valve control system and switching control method and device thereof |
| CN112202323B (en) * | 2020-08-25 | 2021-08-20 | 中国南方电网有限责任公司超高压输电公司广州局 | Redundancy improving method for flexible direct current valve control protection system |
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