CN110552869A - Fault switching method for main circulating pump of cooling system of flexible direct-current power transmission converter valve - Google Patents
Fault switching method for main circulating pump of cooling system of flexible direct-current power transmission converter valve Download PDFInfo
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- CN110552869A CN110552869A CN201910880947.9A CN201910880947A CN110552869A CN 110552869 A CN110552869 A CN 110552869A CN 201910880947 A CN201910880947 A CN 201910880947A CN 110552869 A CN110552869 A CN 110552869A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
Abstract
The invention relates to a fault switching method for a main circulating pump of a cooling system of a flexible direct-current transmission converter valve, which comprises three modes of manual switching, periodic switching and fault switching, wherein the fault switching needs to consider two principles of a standby main circulating pump and a priority order which are preferentially switched to the same bus. The method can realize the alternation of the main circulating pump through two modes of manual switching or periodic switching under the automatic operation mode of the valve cooling system, and can also carry out the fault switching of the main circulating pump when the main circulating pump fails to operate, so as to quit the operation of the fault pump, thereby being convenient for effectively managing the operation of the main circulating pump of the cooling system and improving the cooling efficiency and the cooling effect.
Description
Technical Field
The application belongs to the technical field of circulating pump fault switching, and particularly relates to a fault switching method for a main circulating pump of a cooling system of a flexible direct-current power transmission converter valve.
background
the flexible direct current power module is an important electronic device, has extremely high practical application value in real-time monitoring, and needs to monitor the operation key parameters of the flexible direct current power module for real-time monitoring of the operation condition of the flexible direct current power module, so that research and development of related projects are carried out.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a fault switching method for a main circulating pump of a cooling system of a flexible direct-current power transmission converter valve, which can avoid the defects of the above forms and has the characteristics of simplicity and reliability.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
A method for switching faults of a main circulating pump of a cooling system of a flexible direct-current transmission converter valve comprises three modes of manual switching, periodic switching and fault switching, wherein the fault switching needs to take two principles of a standby main circulating pump and a priority order into consideration, wherein the standby main circulating pump is switched to the same bus preferentially.
The technical scheme of the invention is further improved as follows: the manual switching process comprises the steps that manual switching can be operated in two places of an on-site HMI (human machine interface) and an operator workstation, when any two main circulating pumps run and other two main circulating pumps are normally standby, a button for selecting one running main circulating pump and one standby main circulating pump to run is pressed on the HMI or the operator workstation to realize single-pump switching control, or a button for selecting two standby main circulating pumps to run is pressed to realize double-pump switching control.
The technical scheme of the invention is further improved as follows: the process of cycle switching is, cooling system moves under automatic mode, when the main circulating pump starts to get into the running state of full pressure, control system begins to time the continuous operation time of operation main circulating pump, when the accumulative operation time reaches the cycle switching definite value of settlement, control system will move the main circulating pump operating time zero clearing immediately, switch the main circulating pump of operation to the stand-by pump simultaneously, and concrete switching process is:
When the number of the operating main circulating pumps and the number of the standby main circulating pumps are both more than or equal to 2, under the condition that all the main circulating pumps have no fault and are normally standby, the first operating main circulating pump automatically stops operating after the continuous non-fault power frequency operation time reaches the set switching period, and the first standby main circulating pump is switched to operate at power frequency within a plurality of seconds in a soft start input delay mode.
The technical scheme of the invention is further improved as follows: setting a switching period to be 168 h; delaying for 1-2min after the last operation main circulating pump is successfully switched to the last standby main circulating pump, and switching the next operation main circulating pump to the next standby main circulating pump; the time of the soft start input delay of the standby main circulating pump is 2-5 s.
The technical scheme of the invention is further improved as follows: the process of the fault switching is as follows:
when the main circulating pump runs and breaks down, the control system can calculate the priority sequence of various switching conditions according to the health conditions of the main circulating pump and the standby pump, the fault main circulating pump preferentially selects the direction switching towards the standby pump with high priority, and the main circulating pump is provided with three priority sequences:
1) priority 1, first priority, the backup pump is completely faultless;
2) Priority 2, second priority, backup pump only power frequency failure;
3) Priority 3, third priority, backup pump only soft start failure;
the switching of the main circulating pump is realized by firstly selecting a high-priority standby pump for switching, when the high-priority condition is not met, switching is carried out to a secondary-priority standby pump, and when the secondary-priority condition is not met, switching is carried out to a third-priority standby pump; if the standby pump still does not meet the third priority, the standby pump is not available, and the original fault main circulating pump keeps running.
The technical scheme of the invention is further improved as follows: under the condition that no standby pump is available, when the fault types of the running main circulating pump are the fault types of the serial numbers 1-4 in the table 1, the running can be kept for a long time; when the fault type is a fault type with serial number 5-serial number 6, the fault type can be operated in a short time, and needs to be overhauled and processed as soon as possible; when the fault type is a fault type from a serial number 7 to a serial number 8, the main pump is stopped, so that the flow pressure protection condition of the valve cooling system is met and the outlet is tripped;
Table 1 main circulation pump switching related failures.
due to the adoption of the technical scheme, the invention has the beneficial effects that: when the main circulating pump is switched in a fault mode, the main circulating pump without any fault is switched, the main circulating pump without the fault is switched to the main circulating pump without the fault in the soft start loop (the soft start avoids water flow impact), the main circulating pump without the fault in the working frequency loop is switched, and the switching is not carried out, so that the method is simple, convenient to integrally control and high in popularization and application value.
Drawings
FIG. 1 is a logic diagram for periodic switching of a main circulation pump in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of the switching sequence of four main circulation pumps according to the embodiment of the present invention;
FIG. 3 is a logic block diagram of the switching of the P01 main pump to the P03 or P04 main pump (with no fault in the backup pump) according to an embodiment of the present invention;
FIG. 4 is a logic block diagram of the switching of the P02 main pump to the P04 or P03 main pump (no fault on the backup pump) of an embodiment of the present invention;
FIG. 5 is a logic block diagram of the switching of the P03 main pump to the P01 or P02 main pump (with no fault in the backup pump) of an embodiment of the present invention;
FIG. 6 is a logic block diagram of the switching of the P04 main pump to the P02 or P01 main pump (no fault on the backup pump) of an embodiment of the present invention;
FIG. 7 is a logic diagram of the switching of the P01 main pump to the P03 or P04 main pump (the backup pump only fails at power frequency) according to an embodiment of the present invention;
FIG. 8 is a logic block diagram of the switching of the P02 primary pump to the P04 or P03 primary pump (the backup pump only fails at power frequency) according to an embodiment of the present invention;
FIG. 9 is a logic diagram of the switching of the P03 primary pump to the P01 or P02 primary pump (the backup pump only fails at power frequency) according to an embodiment of the present invention;
FIG. 10 is a logic block diagram of the switching of the P04 main pump to the P02 or P01 main pump (the backup pump only fails at power frequency) according to an embodiment of the present invention;
FIG. 11 is a logic block diagram of the switching of the P01 main pump to the P03 or P04 main pump (backup pump only soft start failure) of an embodiment of the present invention;
FIG. 12 is a logic block diagram of the switching of the P02 main pump to the P04 or P03 main pump (backup pump only soft start failure) of an embodiment of the present invention;
FIG. 13 is a logic block diagram of the switching of the P03 main pump to the P01 or P02 main pump (backup pump only soft start failure) of an embodiment of the present invention;
FIG. 14 is a logic diagram of the switching of the P04 main pump to the P02 or P01 main pump (backup pump only soft start failure) of an embodiment of the present invention.
Detailed Description
the present invention will be described in further detail with reference to examples.
The invention discloses a fault switching method for a main circulating pump of a cooling system of a flexible direct-current power transmission converter valve, which comprises three modes of manual switching, periodic switching and fault switching, wherein the fault switching needs to consider two principles of a standby main circulating pump which is preferentially switched to the same bus and a priority sequence, the four circulating pumps are adopted, the P01 and the P02 main circulating pumps run, the P03 and the P04 main circulating pumps are normally standby, the P01 and the P03 are the same bus, and the P02 and the P04 are the same bus.
the manual switching process comprises the steps that manual switching can be operated in two places of an on-site HMI (human machine interface) and an operator workstation, when any two main circulating pumps run and other two main circulating pumps are normally standby, a button for selecting one running main circulating pump and one standby main circulating pump to run is pressed on the HMI or the operator workstation to realize single-pump switching control, or a button for selecting two standby main circulating pumps to run is pressed to realize double-pump switching control.
Specific examples are: when the P01 and P02 main circulating pumps are operated and the P03 and P04 main circulating pumps are normally standby, the single-pump switching control of the P01 and P03 main circulating pumps is realized by pressing a button for selecting the P01 and P03 main pump operation on an HMI or an operator workstation, and the double-pump switching control of the P01 and P02 main pump operation and the P03 and P04 main circulating pumps is realized by pressing buttons for selecting the P03 and P04 main pump operation.
the process of cycle switching is, cooling system moves under automatic mode, when the main circulating pump starts to get into the running state of full pressure, control system begins to time the continuous operation time of operation main circulating pump, when the accumulative operation time reaches the cycle switching definite value of settlement, control system will move the main circulating pump operating time zero clearing immediately, switch the main circulating pump of operation to the stand-by pump simultaneously, and concrete switching process is:
When the number of the operating main circulating pumps and the number of the standby main circulating pumps are both more than or equal to 2, under the condition that all the main circulating pumps have no fault and are normally standby, the first operating main circulating pump automatically stops operating after the continuous non-fault power frequency operation time reaches the set switching period, and the first standby main circulating pump is switched to operate at power frequency within a plurality of seconds in a soft start input delay mode. Wherein the switching period is set to 168 h; delaying for 1-2min after the last operation main circulating pump is successfully switched to the last standby main circulating pump, and switching the next operation main circulating pump to the next standby main circulating pump; the time of the soft start input delay of the standby main circulating pump is 2-5 s.
Specific examples are: the 4 main circulating pumps have 6 combined operation modes respectively, namely P01 and P02, P01 and P03, P01 and P04, P02 and P03, P02 and P04, and P03 and P04, any one of the above combined operation modes can occur in actual operation, when the valve cooling system operates in an automatic mode, the main circulating pump starts to enter full-pressure operation, a PLC (control system) starts to time the continuous operation time of the operating main circulating pump, when the accumulated operation time reaches a set cycle switching fixed value, the system immediately clears the operation time of the operating main circulating pump, and simultaneously switches the operating main circulating pump to a standby pump.
Fig. 1 is a logic block diagram for switching a P01 main circulation pump and a P02 main circulation pump to a P03 main circulation pump and a P04 main circulation pump when the P03 main circulation pump and the P04 main circulation pump are both normal and standby without faults, the P01 main circulation pump automatically stops operating after the continuous non-fault power frequency operation time reaches a set switching period, meanwhile, the P03 main circulation pump is switched to operate at power frequency after a soft start input delay of 3 seconds, in order to avoid impact on the system caused by simultaneous switching of the two pumps, the P02 main circulation pump needs to wait for the P01 main circulation pump to be switched to the P03 main circulation pump successfully before switching is performed, the P02 main circulation pump automatically stops operating after the continuous non-fault power frequency operation time reaches the set switching period, and the P04 main circulation pump is switched to operate at power frequency after.
the switching control principle of the valve cooling system main circulating pump in other combination modes is completely the same as the switching principle of the P01 and P02 main circulating pumps to the P03 and P04 main circulating pumps when in operation, and the description is not repeated here.
The process of the fault switching is as follows:
when the main circulating pump runs and breaks down, the control system can calculate the priority sequence of various switching conditions according to the health conditions of the main circulating pump and the standby pump, the fault main circulating pump preferentially selects the direction switching towards the standby pump with high priority, and the main circulating pump is provided with three priority sequences:
1) Priority 1, first priority, the backup pump is completely faultless;
2) priority 2, second priority, backup pump only power frequency failure;
3) Priority 3, third priority, backup pump only soft start failure;
The switching of the main circulating pump is realized by firstly selecting a high-priority standby pump for switching, when the high-priority condition is not met, switching is carried out to a secondary-priority standby pump, and when the secondary-priority condition is not met, switching is carried out to a third-priority standby pump; if the standby pump still does not meet the third priority, the standby pump is not available, and the original fault main circulating pump keeps running.
Under the condition that no standby pump is available, when the fault types of the running main circulating pump are the fault types of the serial numbers 1-4 in the table 1, the running can be kept for a long time; when the fault type is a fault type with serial number 5-serial number 6, the fault type can be operated in a short time, and needs to be overhauled and processed as soon as possible; when the fault type is a fault type from a serial number 7 to a serial number 8, the main pump is stopped, so that the flow pressure protection condition of the valve cooling system is met and the outlet is tripped;
| serial number | Fault message | Description of the failure | Time delay |
| 1 | QFKK 01B breaker open | QFKK 01B power frequency control loop fault of AP1 power cabinet | 2s |
| 2 | Fault at power frequency | QFP01G breaker breaking | 500ms |
| 3 | QFKK 01A breaker open | QFKK 01A soft start control loop fault of AP1 power cabinet | 2s |
| 4 | Soft start fault | QFP01R breaker breaking or soft starter fault | 500ms |
| 5 | superheating | main circulation pump bearing overheating set value greater than or equal to main circulation pump overheating set value | 3s |
| 6 | leakage of water | Main circulation pump leak detection switch actuation | 2s |
| 7 | Safety switch open | Main circulation pump QSP01 safety switch break | 500ms |
| 8 | AC power supply failure of AP1 cabinet | Station power supply 400V I section power-off (Low-voltage monitoring relay) | 2s |
Table 1 main circulation pump switching related failures.
Since fig. 2 only reflects the general flow of switching of each main circulation pump, in the actual operation process, two principles, namely a standby main circulation pump that is preferentially switched to the same bus and a priority order, need to be considered, and the following examples detail the detailed switching control strategy of the main pump that has various faults in various combined operation modes: wherein the P01 and the P03 are positioned on the same bus, and the P02 and the P04 are positioned on the same bus.
1) Switching between P01 and P02 main circulation pumps during operation
when a soft start loop fault occurs in the process of soft start of P01 or P02, a power frequency loop fault occurs when a P01 or P02 main circulating pump runs, or the running period of the P01 or P02 main circulating pump reaches, the P01 or P02 main circulating pump is switched to the P03 or P04 main circulating pump:
a. Priority 1 (first priority, with no failure at all for the backup pump) switching sequence:
When the P01 and P02 main circulating pumps are operated currently, the P03 main circulating pump is normally reserved without failure, when the P01 main circulating pump needs to be switched off, the P01 main circulating pump is switched to the P03 main circulating pump, meanwhile, the P03 main circulating pump is firstly turned into full-pressure operation after being turned on softly for 3 seconds, and then is turned into power frequency loop operation after being turned into 5 seconds; if the fault of the P03 main circulating pump does not meet the standby condition, the P04 main circulating pump does not have the fault and is normally standby, the P01 main circulating pump is switched to the P04 main circulating pump, the P04 main circulating pump is firstly turned into full-pressure operation after soft start and time delay of 3s, and then is turned into power frequency loop operation after 5s, as shown in figure 3.
when the P01 and P02 main circulating pumps are operated currently, the P04 main circulating pump is normally reserved without failure, when the P02 main circulating pump needs to be switched off, the P02 main circulating pump is switched to the P04 main circulating pump, the P04 main circulating pump is firstly turned into full-pressure operation after being turned on softly for 3s and then is turned into power frequency loop operation after being turned into 5 s; if the fault of the P04 main circulating pump does not meet the standby condition, the P03 main circulating pump does not have the fault and is normally standby, the P02 main circulating pump is switched to the P03 main circulating pump, the P03 main circulating pump is firstly turned into full-pressure operation after soft start and time delay of 3s, and then is turned into power frequency loop operation after 5s, as shown in figure 4.
When the P03 and P04 main circulating pumps are operated currently, the P01 main circulating pump is normally reserved without failure, when the P03 main circulating pump needs to be switched off, the P03 main circulating pump is switched to the P01 main circulating pump, the P01 main circulating pump is firstly turned into full-pressure operation after being turned on softly for 3s and then is turned into power frequency loop operation after being turned into 5 s; if the fault of the P01 main circulating pump does not meet the standby condition, the P02 main circulating pump does not have the fault and is normally standby, the P03 main circulating pump is switched to the P02 main circulating pump, the P02 main circulating pump is firstly turned into full-pressure operation after soft start and time delay of 3s, and then is turned into power frequency loop operation after 5s, as shown in figure 5.
when the P03 and P04 main circulating pumps are operated currently, the P02 main circulating pump is normally reserved without failure, when the P04 main circulating pump needs to be switched off, the P04 main circulating pump is switched to the P02 main circulating pump, the P02 main circulating pump is firstly turned into full-pressure operation after being turned on softly for 3s and then is turned into power frequency loop operation after being turned into 5 s; if the fault of the P02 main circulating pump does not meet the standby condition, the P01 main circulating pump does not have the fault and is normally standby, the P04 main circulating pump is switched to the P01 main circulating pump, the P01 main circulating pump is firstly turned into full-pressure operation after soft start and time delay of 3s, and then is turned into power frequency loop operation after 5s, as shown in figure 6.
b. switching sequence of priority 2 (second priority, backup pump only power frequency failure):
when the current P01 and P02 main circulating pumps run, only power frequency faults of the P03 and P04 main circulating pumps can be used as standby, when the P01 main circulating pump needs to be switched off, the P01 main circulating pump is switched to the P03 main circulating pump, and the P03 main circulating pump is firstly soft started and is kept in full-pressure running of a soft start loop after 3s of time delay; if the fault of the P03 main circulating pump soft start loop does not meet the standby condition at the moment, the P04 main circulating pump still has only power frequency fault and can be used as the standby condition, the P01 main circulating pump is switched to the P04 main circulating pump, and the P04 main circulating pump is firstly soft started and is always kept in full-pressure operation of the soft start loop after 3s of delay, as shown in fig. 7.
When the current P01 and P02 main circulating pumps run, only power frequency faults of the P03 and P04 main circulating pumps can be used as standby, when the P02 main circulating pump needs to be switched off, the P02 main circulating pump is switched to the P04 main circulating pump, and the P04 main circulating pump is firstly soft started and is kept in full-pressure running of a soft start loop after 3s of time delay; if the fault of the P04 main circulating pump soft start loop does not meet the standby condition at the moment, the P03 main circulating pump still has only power frequency fault and can be used as the standby condition, the P02 main circulating pump is switched to the P03 main circulating pump, and the P03 main circulating pump is firstly soft started and is always kept in full-pressure operation of the soft start loop after 3s of delay, as shown in figure 8.
When the current P03 and P04 main circulating pumps run, only power frequency faults of the P01 and P02 main circulating pumps can be used as standby, when the P03 main circulating pump needs to be switched off, the P03 main circulating pump is switched to the P01 main circulating pump, and the P01 main circulating pump is firstly soft started and is kept in full-pressure running of a soft start loop after 3s of time delay; if the fault of the P01 main circulating pump soft start loop does not meet the standby condition at the moment, the P02 main circulating pump still has only power frequency fault and can be used as the standby condition, the P03 main circulating pump is switched to the P02 main circulating pump, and the P02 main circulating pump is firstly soft started and is always kept in full-pressure operation of the soft start loop after 3s of delay, as shown in figure 9.
When the current P03 and P04 main circulating pumps run, only power frequency faults of the P01 and P02 main circulating pumps can be used as standby, when the P04 main circulating pump needs to be switched off, the P04 main circulating pump is switched to the P02 main circulating pump, and the P02 main circulating pump is firstly soft started and is kept in full-pressure running of a soft start loop after 3s of time delay; if the fault of the P02 main circulating pump soft start loop does not meet the standby condition at the moment, the P01 main circulating pump still has only power frequency fault and can be used as the standby condition, the P04 main circulating pump is switched to the P01 main circulating pump, and the P01 main circulating pump is firstly soft started and is always kept in full-pressure operation of the soft start loop after 3s of delay, as shown in figure 10.
c. Priority 3 (third priority, backup pump soft start only failure) switching sequence:
When the current P01 and P02 main circulating pumps run, only soft start faults of the P03 and P04 main circulating pumps can be used as standby, when the P01 main circulating pump needs to be switched off, the P01 main circulating pump is switched to the P03 main circulating pump, and the P03 main circulating pump directly runs through full-pressure start of a power frequency loop; if the power frequency loop of the P03 main circulating pump fails to meet the standby requirement, the P04 main circulating pump still has a soft start fault and can be used as the standby requirement, the P01 main circulating pump is switched to the P04 main circulating pump, and the P04 main circulating pump directly runs through the power frequency loop in a full-pressure starting mode, as shown in FIG. 11.
When the current P01 and P02 main circulating pumps run, only soft start faults of the P03 and P04 main circulating pumps can be used as standby, when the P02 main circulating pump needs to be switched off, the P02 main circulating pump is switched to the P04 main circulating pump, and the P04 main circulating pump directly runs through full-pressure start of a power frequency loop; if the power frequency loop of the P04 main circulating pump fails to meet the standby requirement, the P03 main circulating pump still has a soft start fault and can be used as the standby requirement, the P02 main circulating pump is switched to the P03 main circulating pump, and the P03 main circulating pump directly runs through the power frequency loop in a full-pressure starting mode, as shown in FIG. 12.
When the current P03 and P04 main circulating pumps run, only soft start faults of the P01 and P02 main circulating pumps can be used as standby, when the P03 main circulating pump needs to be switched off, the P03 main circulating pump is switched to the P01 main circulating pump, and the P01 main circulating pump directly runs through full-pressure start of a power frequency loop; if the power frequency loop of the P01 main circulating pump fails to meet the standby requirement, the P02 main circulating pump still has a soft start fault and can be used as the standby requirement, the P03 main circulating pump is switched to the P02 main circulating pump, and the P02 main circulating pump directly runs through the power frequency loop in a full-pressure starting mode, as shown in FIG. 13.
When the current P03 and P04 main circulating pumps run, only soft start faults of the P01 and P02 main circulating pumps can be used as standby, when the P04 main circulating pump needs to be switched off, the P04 main circulating pump is switched to the P02 main circulating pump, and the P02 main circulating pump directly runs through full-pressure start of a power frequency loop; if the power frequency loop of the P02 main circulating pump fails to meet the standby requirement, the P01 main circulating pump still has a soft start fault and can be used as the standby requirement, the P04 main circulating pump is switched to the P01 main circulating pump, and the P01 main circulating pump directly runs through the power frequency loop in a full-pressure starting mode, as shown in FIG. 14.
Claims (6)
1. A fault switching method for a main circulating pump of a cooling system of a flexible direct-current power transmission converter valve is characterized by comprising the following steps: the method comprises three modes of manual switching, periodic switching and fault switching, wherein the fault switching needs to take into consideration two principles of a standby main circulating pump which is preferentially switched to the same bus and a priority sequence.
2. The fault switching method for the main circulating pump of the cooling system of the flexible direct current transmission converter valve according to claim 1, is characterized in that: the manual switching process comprises the steps that manual switching can be operated in two places of an on-site HMI (human machine interface) and an operator workstation, when any two main circulating pumps run and other two main circulating pumps are normally standby, a button for selecting one running main circulating pump and one standby main circulating pump to run is pressed on the HMI or the operator workstation to realize single-pump switching control, or a button for selecting two standby main circulating pumps to run is pressed to realize double-pump switching control.
3. The fault switching method for the main circulating pump of the cooling system of the flexible direct current transmission converter valve according to claim 2, is characterized in that: the process of cycle switching is, cooling system moves under automatic mode, when the main circulating pump starts to get into the running state of full pressure, control system begins to time the continuous operation time of operation main circulating pump, when the accumulative operation time reaches the cycle switching definite value of settlement, control system will move the main circulating pump operating time zero clearing immediately, switch the main circulating pump of operation to the stand-by pump simultaneously, and concrete switching process is:
When the number of the operating main circulating pumps and the number of the standby main circulating pumps are both more than or equal to 2, under the condition that all the main circulating pumps have no fault and are normally standby, the first operating main circulating pump automatically stops operating after the continuous non-fault power frequency operation time reaches the set switching period, and the first standby main circulating pump is switched to operate at power frequency within a plurality of seconds in a soft start input delay mode.
4. The fault switching method for the main circulating pump of the cooling system of the flexible direct current transmission converter valve according to claim 3, is characterized in that: setting a switching period to be 168 h; delaying for 1-2min after the last operation main circulating pump is successfully switched to the last standby main circulating pump, and switching the next operation main circulating pump to the next standby main circulating pump; the time of the soft start input delay of the standby main circulating pump is 2-5 s.
5. the method for switching the fault of the main circulating pump of the cooling system of the flexible direct current transmission converter valve according to claim 1, wherein the process of the fault switching is as follows:
when the main circulating pump runs and breaks down, the control system can calculate the priority sequence of various switching conditions according to the health conditions of the main circulating pump and the standby pump, the fault main circulating pump preferentially selects the direction switching towards the standby pump with high priority, and the main circulating pump is provided with three priority sequences:
1) Priority 1, first priority, the backup pump is completely faultless;
2) priority 2, second priority, backup pump only power frequency failure;
3) priority 3, third priority, backup pump only soft start failure;
The switching of the main circulating pump is realized by firstly selecting a high-priority standby pump for switching, when the high-priority condition is not met, switching is carried out to a secondary-priority standby pump, and when the secondary-priority condition is not met, switching is carried out to a third-priority standby pump; if the standby pump still does not meet the third priority, the standby pump is not available, and the original fault main circulating pump keeps running.
6. The fault switching method for the main circulating pump of the cooling system of the flexible direct current transmission converter valve according to claim 5, is characterized in that: under the condition that no standby pump is available, when the fault types of the running main circulating pump are the fault types of the serial numbers 1-4 in the table 1, the running can be kept for a long time; when the fault type is a fault type with serial number 5-serial number 6, the fault type can be operated in a short time, and needs to be overhauled and processed as soon as possible; when the fault type is a fault type from a serial number 7 to a serial number 8, the main pump is stopped, so that the flow pressure protection condition of the valve cooling system is met and the outlet is tripped;
Table 1 main circulation pump switching related failures.
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| CN201910880947.9A CN110552869A (en) | 2019-09-18 | 2019-09-18 | Fault switching method for main circulating pump of cooling system of flexible direct-current power transmission converter valve |
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| CN201910880947.9A CN110552869A (en) | 2019-09-18 | 2019-09-18 | Fault switching method for main circulating pump of cooling system of flexible direct-current power transmission converter valve |
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| CN (1) | CN110552869A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102123A (en) * | 2019-12-13 | 2020-05-05 | 国家电网有限公司 | Automatic control method for auxiliary engine system of pumped storage power station |
| CN112821843A (en) * | 2020-12-31 | 2021-05-18 | 哈尔滨宇龙自动化有限公司 | Intelligent switching control method and system for variable-frequency speed-regulation multi-load system |
-
2019
- 2019-09-18 CN CN201910880947.9A patent/CN110552869A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111102123A (en) * | 2019-12-13 | 2020-05-05 | 国家电网有限公司 | Automatic control method for auxiliary engine system of pumped storage power station |
| CN111102123B (en) * | 2019-12-13 | 2022-01-25 | 国家电网有限公司 | Automatic control method for auxiliary engine system of pumped storage power station |
| CN112821843A (en) * | 2020-12-31 | 2021-05-18 | 哈尔滨宇龙自动化有限公司 | Intelligent switching control method and system for variable-frequency speed-regulation multi-load system |
| CN112821843B (en) * | 2020-12-31 | 2023-07-14 | 哈尔滨宇龙自动化有限公司 | Intelligent switching control method and system for variable-frequency speed-regulating multi-load system |
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Application publication date: 20191210 |