Automatic control method and system for external air cooler of valve cooling system of extra-high voltage converter station

Abstract

The invention relates to the technical field of air cooling fan process cooling, in particular to an automatic control method and system for an external air cooler of a valve cooling system of an extra-high voltage converter station. According to the method, the current environment temperature of the external air cooling equipment is obtained, and the corresponding cooling mode is selected according to the current environment temperature of the external air cooling equipment to control the inlet valve temperature of the current converter valve, the number of variable-frequency fans and power-frequency fans in each group of external air coolers started in sequence in each cooling mode is in direct proportion to the ambient temperature of the current external air cooling equipment; the inlet valve temperature of the current converter valve and the load value of the extra-high voltage converter station are obtained, the start-stop time of each group of external air coolers is determined according to the inlet valve temperature of the current converter valve and the load value of the extra-high voltage converter station in each cooling mode, and grouping control is performed on the external air coolers so as to control the inlet valve temperature of the current converter valve to be within a preset range. According to the invention, safe and stable operation of the extra-high voltage converter station is satisfied, and the problems of frequent starting and no energy saving of the external air cooler of the valve cooling system are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of process cooling of air-cooling fans, and in particular to an automatic control method and system for an external cooling fan of a valve cooling system of an ultra-high voltage converter station. Background Art

[0002] In recent years, my country's ultra-high voltage power grid has developed rapidly, and ultra-high voltage direct current transmission has become a top priority due to its obvious advantages in long-distance and large-capacity transmission lines. The ultra-high voltage converter valve with rectification function is an important link in the construction of converter stations. The converter valve will generate a lot of heat during operation. If the heat is not dissipated in time, the converter valve may be burned. The valve cooling system of the ultra-high voltage converter station can effectively dissipate the large amount of heat generated by the converter valve during operation, ensure that the operating temperature of the converter valve is within the normal range, improve the reliability and transmission efficiency of the entire ultra-high voltage converter station, and ensure the continuous and stable transmission of electricity. Therefore, the valve cooling system of the ultra-high voltage converter station is an important guarantee to ensure the safe and reliable operation of the converter valve.

[0003] The existing control method for the external cooling fan of the valve cooling system is: every four variable frequency fans form a group, every four industrial frequency fans form a group, and the four groups of variable frequency fans are started first. Once the four groups of variable frequency fans reach the maximum air volume output, but the system temperature is still higher than the set threshold, the six groups of industrial frequency fans are started. The industrial frequency fans provide additional cooling capacity at this stage to further reduce the temperature. Even if the actual demand is lower, the existing control method will still start the four variable frequency fans at the same time, resulting in energy waste. In addition, the existing control method has the problem of frequent start and stop of the fan, which causes drastic changes in the parameters such as the liquid level of the expansion tank, the inlet valve pressure, and the return water pressure of the internal cooling system, causing the monitoring system to report alarms such as "low return water pressure", and a large number of fan start and stop messages will be generated, causing great inconvenience to the stable operation and operation monitoring of the system. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the fan is frequently started and stopped and is not energy-efficient.

[0005] In order to solve the above technical problems, the present invention provides an automatic control method for an external cooling fan of a valve cooling system of a UHV converter station, comprising the following steps:

[0006] The current ambient temperature of the external air cooling device is obtained, and according to the current ambient temperature of the external air cooling device, the corresponding cooling mode is selected to control the inlet valve temperature of the current converter valve, wherein the number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence in each cooling mode is proportional to the current ambient temperature of the external air cooling device;

[0007] The current inlet valve temperature of the converter valve and the load value of the UHV converter station are obtained. For each cooling mode, the start and stop time of each group of external cooling fans are determined according to the current inlet valve temperature of the converter valve and the load value of the UHV converter station. The external cooling fans are grouped and controlled to control the inlet valve temperature of the current converter valve within a preset range.

[0008] Preferably, the method of selecting a corresponding cooling mode to control the current inlet valve temperature of the converter valve according to the current ambient temperature of the external air cooling device includes:

[0009] If the current ambient temperature of the external air-cooling equipment is greater than or equal to the medium temperature preset value, the first cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group of industrial frequency fans, where N is the total number of variable frequency fans, M is the total number of industrial frequency fans,

[0010] The start-up sequence of the first cooling mode is: synchronously start the i1th group of variable frequency fans and the i1th group of industrial frequency fans, start each group of external cooling fans in sequence according to the sequence of each group until all the variable frequency fans have started, and then start the remaining groups of industrial frequency fans in sequence.

[0011] If the current ambient temperature of the external air-cooling equipment is greater than the low temperature preset value and less than the medium temperature preset value, the second cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group power frequency fan;

[0012] The startup sequence of the second cooling mode is: synchronously start the i b Group variable frequency fan and the i b Start the power frequency fans of each group in sequence, and start the external cooling fans of each group in sequence until all the variable frequency fans are started, and then start the remaining power frequency fans in sequence.

[0013] If the current ambient temperature of the external air-cooled equipment is less than or equal to the low temperature preset value, the third cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group power frequency fan;

[0014] The starting sequence of the third cooling mode is: start each group of variable frequency fans in sequence according to the sequence of each group, until all the variable frequency fans are started, and then start each group of industrial frequency fans in sequence.

[0015] Preferably, the first cooling mode, the second cooling mode and the third cooling mode are stopped in a reverse order of their start-up order.

[0016] Preferably, if the current ambient temperature of the external air cooling device is greater than or equal to the medium temperature preset value, the first cooling mode is used to control the inlet valve temperature of the current converter valve, including:

[0017] When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first group of industrial frequency fans and the first group of variable frequency fans are started after a preset start time delay;

[0018] When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, after the i1th group of industrial frequency fans or the i1th group of variable frequency fans have run for the preset start time, the i1+1th group of industrial frequency fans and the i1+1th group of variable frequency fans are started. Until The frequency conversion fans of the j1st group are all started. After the preset start time of the power frequency fans of the j1st group, the power frequency fans of the j1+1st group are started.

[0019] When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fans in operation is greater than n1, the last started group of industrial frequency fans is stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fans in operation is less than or equal to n1, the last started group of industrial frequency fans and a group of variable frequency fans are stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running.

[0020] When the current inlet valve temperature of the converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after the preset stop time.

[0021] Preferably, if the current ambient temperature of the external air cooling device is greater than the low temperature preset value and less than the medium temperature preset value, the second cooling mode is used to control the inlet valve temperature of the current converter valve, including:

[0022] When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first group of industrial frequency fans and the first group of variable frequency fans are started after a preset start time delay;

[0023] When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, the i2+1th group of industrial frequency fans and the i2+1th group of variable frequency fans are started. Until The frequency conversion fans of the j2nd group are all started. After the preset start time of the power frequency fans of the j2nd group, the power frequency fans of the j2+1th group are started.

[0024] When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fans in operation is greater than n1, the last started group of industrial frequency fans is stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fans in operation is less than or equal to n1, the last started group of industrial frequency fans and a group of variable frequency fans are stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running.

[0025] When the current inlet valve temperature of the converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after the preset stop time.

[0026] Preferably, if the current ambient temperature of the external air cooling device is less than or equal to the low temperature preset value, the third cooling mode is used to control the inlet valve temperature of the current converter valve, including:

[0027] When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first set of variable frequency fans is started after a preset start time delay;

[0028] When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, after the i3th group of variable frequency fans runs for the preset start time, the i3+1th group of variable frequency fans is started. Until all the variable frequency fans in group n3 are started, after the preset start time of the industrial frequency fans in group j3, the industrial frequency fans in group j3+1 are started.

[0029] When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fan groups in operation is greater than n3 groups, the last group of industrial frequency fans started is stopped for each preset stop time. When the number of fan groups in operation is less than or equal to n3 groups, the last group of variable frequency fans started is stopped for each preset stop time until only the first group of variable frequency fans is running.

[0030] When the inlet valve temperature of the current converter valve is less than 34°C and only the first set of variable frequency fans is running, the first set of variable frequency fans will be stopped after the preset stop time.

[0031] Preferably, the preset start time includes:

[0032] If the current UHV converter station load value is greater than the target load value, the preset start time is a set time within the high load start range centered at 100 seconds;

[0033] If the current load value of the UHV converter station is less than or equal to the target load value, the preset start time is a set time within the low load start range centered at 60 seconds.

[0034] Preferably, the preset stop time is 6 minutes.

[0035] Preferably, based on the current inlet valve temperature of the converter valve and the inlet valve temperature setting value, the output frequency of the frequency converter is adjusted using the PID control principle to control the rotation speed of the variable frequency fan.

[0036] The present invention also provides an automatic control system for an external cooling fan of a valve cooling system of a UHV converter station, comprising:

[0037] The mode selection module obtains the current ambient temperature of the external air cooling device, and selects the corresponding cooling mode to control the inlet valve temperature of the current converter valve according to the current ambient temperature of the external air cooling device. The number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence in each cooling mode is proportional to the current ambient temperature of the external air cooling device.

[0038] The control module obtains the current inlet valve temperature of the converter valve and the load value of the UHV converter station. Each cooling mode determines the start and stop time of each group of external cooling fans according to the current inlet valve temperature of the converter valve and the load value of the UHV converter station, and controls the external cooling fans in groups to control the inlet valve temperature of the current converter valve to be within a preset range.

[0039] The above technical solution of the present invention has the following beneficial effects compared with the prior art:

[0040] The present invention discloses an automatic control method and system for external cooling fans of a valve cooling system of an ultra-high voltage converter station, which obtains the current ambient temperature of the external air cooling equipment, and selects a corresponding cooling mode to control the inlet valve temperature of the current converter valve according to the current ambient temperature of the external air cooling equipment, wherein the number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence in each cooling mode is proportional to the current ambient temperature of the external air cooling equipment; the inlet valve temperature of the current converter valve and the load value of the ultra-high voltage converter station are obtained, and each cooling mode determines the start and stop time of each group of external cooling fans according to the inlet valve temperature of the current converter valve and the load value of the ultra-high voltage converter station, and performs group control on the external cooling fans to control the inlet valve temperature of the current converter valve to be within a preset range. The present invention sets three cooling modes with different fan groupings and start-up sequences according to different ambient temperatures of external air cooling equipment. As the ambient temperature of the current external air cooling equipment increases, the number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence also increases accordingly, which can ensure the safe and stable operation of the UHV converter station while reducing the fan energy consumption, solving the problem of frequent start-up and non-energy saving of the external cooling fans in the valve cooling system. At the same time, each cooling mode determines the start and stop time of each group of external cooling fans according to the current inlet valve temperature of the converter valve and the load value of the UHV converter station, which can accurately control the operation of the fans, avoid unnecessary energy consumption, effectively improve the efficiency of the system, and achieve a higher energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0042] Figure 1 The present invention is a structural schematic diagram of an automatic control method and system for an external cooling fan of a valve cooling system of an ultra-high voltage converter station.

[0043] Figure 2 It is a flow chart of the steps of an automatic control method for an external cooling fan of a valve cooling system of an ultra-high voltage converter station according to the present invention.

[0044] Figure 3 It is a system structure diagram of an automatic control system for an external cooling fan of a valve cooling system of an ultra-high voltage converter station according to the present invention. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0046] Reference Figure 1 , 2 As shown, the first embodiment of the present invention provides an automatic control method for an external cooling fan of a valve cooling system of a UHV converter station, comprising the following steps:

[0047] Step S1: obtaining the current ambient temperature of the external air cooling device, and selecting a corresponding cooling mode to control the inlet valve temperature of the current converter valve according to the current ambient temperature of the external air cooling device, wherein the number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence in each cooling mode is proportional to the current ambient temperature of the external air cooling device;

[0048] In this embodiment, preferably, the step of selecting a corresponding cooling mode to control the inlet temperature of the current converter valve according to the current ambient temperature of the external air cooling device includes:

[0049] If the current ambient temperature of the external air-cooling equipment is greater than or equal to the medium temperature preset value, the first cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group of industrial frequency fans, where N is the total number of variable frequency fans, M is the total number of industrial frequency fans,

[0050] The start-up sequence of the first cooling mode is: synchronously start the i1th group of variable frequency fans and the i1th group of industrial frequency fans, start each group of external cooling fans in sequence according to the sequence of each group until all the variable frequency fans are started, and then start the remaining groups of industrial frequency fans in sequence, where:

[0051] If the current ambient temperature of the external air-cooling equipment is greater than the low temperature preset value and less than the medium temperature preset value, the second cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group power frequency fan;

[0052] The startup sequence of the second cooling mode is: synchronously start the i b Group variable frequency fan and the i b Start each group of power frequency fans in sequence according to the sequence of each group until all the variable frequency fans are started, and then start the remaining groups of power frequency fans in sequence.

[0053] If the current ambient temperature of the external air-cooled equipment is less than or equal to the low temperature preset value, the third cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group power frequency fan;

[0054] The starting sequence of the third cooling mode is: start each group of variable frequency fans in sequence according to the sequence of each group, until all the variable frequency fans are started, and then start each group of industrial frequency fans in sequence.

[0055] In this embodiment, preferably, the stopping order of the first cooling mode, the second cooling mode and the third cooling mode is performed in the reverse order of their starting order.

[0056] According to the different ambient temperatures of the external air-cooled equipment, three cooling modes with different fan groupings and start-up sequences are set up, which can ensure the safe and stable operation of the UHV converter station while reducing the fan energy consumption, solving the problem of frequent startup and non-energy-saving of the external cooling fan in the valve cooling system.

[0057] The medium temperature preset value and the low temperature preset value can be selected according to the actual situation of the converter station.

[0058] Step S2: Obtain the current inlet valve temperature of the converter valve and the load value of the UHV converter station. For each cooling mode, determine the start and stop time of each group of external cooling fans according to the current inlet valve temperature of the converter valve and the load value of the UHV converter station, and control the external cooling fans in groups to control the inlet valve temperature of the current converter valve to be within a preset range.

[0059] In this embodiment, preferably, if the current external air cooling device ambient temperature is greater than or equal to the medium temperature preset value, the first cooling mode is used to control the inlet valve temperature of the current converter valve, including:

[0060] When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first group of industrial frequency fans and the first group of variable frequency fans are started after a preset start time delay;

[0061] When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, after the i1th group of industrial frequency fans or the i1th group of variable frequency fans have run for the preset start time, the i1+1th group of industrial frequency fans and the i1+1th group of variable frequency fans are started. Until The frequency conversion fans of the j1st group are all started. After the preset start time of the power frequency fans of the j1st group, the power frequency fans of the j1+1st group are started.

[0062] When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fans in operation is greater than n1, the last started group of industrial frequency fans is stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fans in operation is less than or equal to n1, the last started group of industrial frequency fans and a group of variable frequency fans are stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running.

[0063] When the current inlet valve temperature of the converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after the preset stop time.

[0064] In this embodiment, preferably, if the current external air cooling device ambient temperature is greater than the low temperature preset value and less than the medium temperature preset value, the second cooling mode is used to control the inlet valve temperature of the current converter valve, including:

[0065] When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first group of industrial frequency fans and the first group of variable frequency fans are started after a preset start time delay;

[0066] When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, the i2+1th group of industrial frequency fans and the i2+1th group of variable frequency fans are started. Until The frequency conversion fans of the j2nd group are all started. After the preset start time of the power frequency fans of the j2nd group, the power frequency fans of the j2+1th group are started.

[0067] When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fans in operation is greater than n1, the last started group of industrial frequency fans is stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fans in operation is less than or equal to n1, the last started group of industrial frequency fans and a group of variable frequency fans are stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running.

[0068] When the current inlet valve temperature of the converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after the preset stop time.

[0069] In this embodiment, preferably, if the current external air cooling device ambient temperature is less than or equal to the low temperature preset value, the third cooling mode is used to control the inlet valve temperature of the current converter valve, including:

[0070] When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first set of variable frequency fans is started after a preset start time delay;

[0071] When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, after the i3th group of variable frequency fans runs for the preset start time, the i3+1th group of variable frequency fans is started. Until all the variable frequency fans in group n3 are started, after the preset start time of the industrial frequency fans in group j3, the industrial frequency fans in group j3+1 are started.

[0072] When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fan groups in operation is greater than n3 groups, the last group of industrial frequency fans started is stopped for each preset stop time. When the number of fan groups in operation is less than or equal to n3 groups, the last group of variable frequency fans started is stopped for each preset stop time until only the first group of variable frequency fans is running.

[0073] When the inlet valve temperature of the current converter valve is less than 34°C and only the first set of variable frequency fans is running, the first set of variable frequency fans will be stopped after the preset stop time.

[0074] In this embodiment, preferably, the preset start time includes:

[0075] If the current UHV converter station load value is greater than the target load value, the preset start time is a set time within the high load start range centered at 100 seconds;

[0076] If the current load value of the UHV converter station is less than or equal to the target load value, the preset start time is a set time within the low load start range centered at 60 seconds.

[0077] By comparing the current UHV converter station load value with the target load value, the preset start time of each group of fans can be determined. By accurately adjusting the start time of the fans, unnecessary fan operation can be avoided, thereby reducing energy consumption. The fans are started only when the load increases to a certain level, which helps to improve the overall energy efficiency of the system. The delay time of fan start-up can help avoid system overload when the load changes rapidly, thereby ensuring the stability and reliability of system operation.

[0078] In this embodiment, preferably, the preset stop time is 6 minutes. Selecting 6 minutes can help ensure that the fan has enough downtime when it is not needed, thereby avoiding excessive energy waste.

[0079] In this embodiment, preferably, based on the current inlet valve temperature of the converter valve and the inlet valve temperature setting value, the PID control principle is used to adjust the output frequency of the frequency converter to control the speed of the variable frequency fan. By using the PID control principle to adjust the output frequency of the frequency converter to control the fan speed, the stability of the system and the temperature control accuracy can be significantly improved. The PID controller can adjust the fan speed in real time, effectively compensate for external disturbances and system changes, reduce energy waste, and achieve energy saving and consumption reduction. Smooth speed regulation reduces mechanical wear of the equipment, extends the life of the equipment, reduces temperature fluctuations, and improves the operating stability and overall efficiency of the system.

[0080] The present invention can effectively reduce energy consumption by adjusting the cooling mode and fan control in real time, so that the inlet valve temperature of the current converter valve is always maintained within the preset range, ensuring the stable operation of the UHV converter station and preventing overheating or insufficient cooling. Through precise temperature control and reasonable fan grouping control, the workload and frequent start and stop of the equipment are reduced, thereby reducing mechanical wear, extending the service life of the fan, reducing the maintenance frequency and related costs of the equipment, taking into account energy saving, ensuring safety, and reducing the workload of operators.

[0081] In this embodiment, specifically, the air cooler of the valve external cooling system is equipped with 40 fans, including 16 variable frequency fans and 24 industrial frequency fans, and the medium temperature preset value is 25°C and the low temperature preset value is 15°C. The target load value is set to 6000MW. When the current UHV converter station load value is greater than 6000MW, the preset start time is set to 100 seconds. When the current UHV converter station load value is less than or equal to 6000MW, the preset start time is set to 60 seconds.

[0082] If the ambient temperature T1 of the external air-cooling equipment is greater than or equal to 25°C, the first cooling mode is adopted, specifically: the air cooler fans are divided into 16 groups for control, of which every 4 variable frequency fans form a group and every 2 industrial frequency fans form a group.

[0083] M11-M41, M51-M81, M12-M42, and M52-M82 are 4 groups of variable frequency fans, and M13-M23, M33-M43, M53-M63, M73-M83, M14-M24, M34-M44, M54-M64, M74-M84, M15-M25, M35-M45, M55-M65, and M75-M85 are 12 groups of industrial frequency fans.

[0084] The fan start-up sequence for the first cooling mode is: the first group of variable frequency fans + the first group of industrial frequency fans - the second group of variable frequency fans + the second group of industrial frequency fans - the third group of variable frequency fans + the third group of industrial frequency fans - the fourth group of variable frequency fans + the fourth group of industrial frequency fans - the remaining groups of industrial frequency fans.

[0085] The fan stopping order in the first cooling mode is: the twelfth group of industrial frequency fans to the fifth group of industrial frequency fans stop in sequence - the fourth group of variable frequency fans + the fourth group of industrial frequency fans - the third group of variable frequency fans + the third group of industrial frequency fans - the second group of variable frequency fans + the second group of industrial frequency fans - the first group of variable frequency fans + the first group of industrial frequency fans.

[0086] The specific steps of the first cooling mode are:

[0087] If the current load value of the UHV converter station is less than or equal to 6000MW, when the inlet valve temperature of the current converter valve is greater than or equal to 36℃, after a delay of 100s, start the first group of power frequency fans and the first group of variable frequency fans; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, after the i1th group of power frequency fans or the i1th group of variable frequency fans have been running for 100s, start the i1+1th group of power frequency fans and the i1+1th group of variable frequency fans, i1=1, 2…3, until all 4 groups of variable frequency fans are started, after the j1th group of power frequency fans have been running for 100s, start the j1+1th group of power frequency fans, j1=4, 5…11; when the inlet valve temperature of the current converter valve is less than 36℃, it will be in operation. The speed of the variable frequency fan in the running state is set to the lowest speed. According to the fan start-up sequence, when the number of fan groups in the running state is greater than 4, the last started group of industrial frequency fans shall be stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fan groups in the running state is less than or equal to 4, the last started group of industrial frequency fans and one group of variable frequency fans shall be stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the inlet valve temperature of the current converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans shall be stopped after running for 6 minutes.

[0088] If the current load value of the UHV converter station is greater than 6000MW, when the inlet valve temperature of the current converter valve is greater than or equal to 36℃, after a delay of 60s, start the first group of power frequency fans and the first group of variable frequency fans; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, after the i1th group of power frequency fans or the i1th group of variable frequency fans have been running for 100s, start the i1+1th group of power frequency fans and the i1+1th group of variable frequency fans, i1=1, 2…3, until all 4 groups of variable frequency fans are started, after the j1th group of power frequency fans have been running for 60s, start the j1+1th group of power frequency fans, j1=4, 5…11; when the inlet valve temperature of the current converter valve is less than 36℃, the The speed of the variable frequency fan is set to the lowest speed. According to the fan start-up sequence, when the number of fan groups in operation is greater than 4, the last group of industrial frequency fans started is stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fan groups in operation is less than or equal to 4, the last group of industrial frequency fans and one group of variable frequency fans started are stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the inlet valve temperature of the current converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after running for 6 minutes.

[0089] If the ambient temperature T1 of the external air-cooling equipment is greater than 5°C and less than 25°C, the second cooling mode is adopted, specifically: the air-cooling fans are divided into 20 groups for control, of which every 2 variable frequency fans form a group and every 2 industrial frequency fans form a group.

[0090] M11-M21, M31-M41, M51-M61, M71-M81, M12-M22, M32-M42, M52-M62, M72-M82 are 8 groups of variable frequency fans, M13-M23, M33-M43, M53-M63, M73-M83, M14-M24, M34-M44, M54-M64, M74-M84, M15-M25, M35-M45, M55-M65, M75-M85 are 12 groups of industrial frequency fans.

[0091] The control method of the second cooling mode is the same as that of the first cooling mode, except that the fans are grouped differently. The start and stop sequence of the fans is the same as that of the first cooling mode.

[0092] The specific steps of the second cooling mode are:

[0093] If the current load value of the UHV converter station is less than or equal to 6000MW, when the inlet valve temperature of the current converter valve is greater than or equal to 36℃, after a delay of 100s, start the first group of power frequency fans and the first group of variable frequency fans; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, after the i2th group of power frequency fans or the i2th group of variable frequency fans have run for 100s, start the i2+1th group of power frequency fans and the i2+1th group of variable frequency fans, i2=1, 2…7, until all 8 groups of variable frequency fans are started, after the j2th group of power frequency fans have run for 100s, start the j2+1th group of power frequency fans, j2=8, 9…11; when the inlet valve temperature of the current converter valve is less than 36℃, it will be in operation. The speed of the variable frequency fans in the running state is set to the lowest speed. According to the fan start-up sequence, when the number of fans in the running state is greater than 8, the last started group of industrial frequency fans shall be stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fans in the running state is less than or equal to 8, the last started group of industrial frequency fans and one group of variable frequency fans shall be stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the inlet valve temperature of the current converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans shall be stopped after running for 6 minutes.

[0094] If the current load value of the UHV converter station is greater than 6000MW, when the inlet valve temperature of the current converter valve is greater than or equal to 36℃, after a delay of 60s, start the first group of power frequency fans and the first group of variable frequency fans; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, after the i2th group of power frequency fans or the i2th group of variable frequency fans have been running for 100s, start the i2+1th group of power frequency fans and the i2+1th group of variable frequency fans, i2=1, 2…7, until all 8 groups of variable frequency fans are started, after the j2th group of power frequency fans have been running for 60s, start the j2+1th group of power frequency fans, j2=8, 9…11; when the inlet valve temperature of the current converter valve is less than 36℃, the The speed of the variable frequency fan is set to the lowest speed. According to the fan start-up sequence, when the number of fan groups in operation is greater than 4, the last group of industrial frequency fans started is stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fan groups in operation is less than or equal to 4, the last group of industrial frequency fans and one group of variable frequency fans started are stopped every 6 minutes until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the inlet valve temperature of the current converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after running for 6 minutes.

[0095] If the current outdoor air-cooling equipment ambient temperature T1 is less than 5°C, the third cooling mode is adopted, specifically: the air-cooling fans are divided into 20 groups for control, of which every 2 variable frequency fans form a group and every 2 industrial frequency fans form a group.

[0096] M11-M21, M31-M41, M51-M61, M71-M81, M12-M22, M32-M42, M52-M62, M72-M82 are 8 groups of variable frequency fans, M13-M23, M33-M43, M53-M63, M73-M83, M14-M24, M34-M44, M54-M64, M74-M84, M15-M25, M35-M45, M55-M65, M75-M85 are 12 groups of industrial frequency fans.

[0097] The fan start-up sequence for the third cooling mode is: the fan start-up sequence is: the first group of variable frequency fans to the eighth group of variable frequency fans are started in sequence - the first group of industrial frequency fans to the twelfth group of industrial frequency fans are started in sequence.

[0098] The fan stopping sequence in the third cooling mode is as follows: the twelfth group of industrial frequency fans to the first group of industrial frequency fans stop in sequence - the eighth group of variable frequency fans to the first group of variable frequency fans stop in sequence.

[0099] The specific steps of the third cooling mode are:

[0100] If the current load value of the UHV converter station is less than or equal to 6000MW, when the inlet valve temperature of the current converter valve is greater than or equal to 36℃, after a delay of 100s, start the first group of variable frequency fans; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, after the i3th group of variable frequency fans runs for the preset start time, start the i3+1th group of variable frequency fans, i3=1, 2…7, until all 8 groups of variable frequency fans are started, after the j3th group of industrial frequency fans runs for 100s, start the j3+1th group of industrial frequency fans, j3=8, 9…11; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, after the i3th group of variable frequency fans runs for the preset start time, start the j3+1th group of industrial frequency fans, j3=8, 9…11; When the valve temperature is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fan groups in operation is greater than 8, the last group of industrial frequency fans started is stopped every 6 minutes. When the number of fan groups in operation is less than or equal to 8, the last group of variable frequency fans started is stopped every 6 minutes until only the first group of variable frequency fans is running. When the inlet valve temperature of the current converter valve is less than 34°C and only the first group of variable frequency fans is running, the first group of variable frequency fans is stopped after running for 6 minutes.

[0101] If the current load value of the UHV converter station is greater than 6000MW, when the inlet valve temperature of the current converter valve is greater than or equal to 36℃, the first group of variable frequency fans will be started after a delay of 60s; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, after the i3th group of variable frequency fans runs for the preset start time, the i3+1th group of variable frequency fans will be started, i3=1, 2…7, until all 8 groups of variable frequency fans are started, after the j3th group of power frequency fans runs for 600s, the j3+1th group of power frequency fans will be started, j3=8, 9…11; when the inlet valve temperature of the current converter valve is greater than or equal to 39℃, the i3+1th group of variable frequency fans will be started after the i3th group of power frequency fans runs for the preset start time, i3=1, 2…7, until all 8 groups of variable frequency fans are started, and after the j3th group of power frequency fans runs for 600s, the j3+1th group of power frequency fans will be started, j3=8, 9…11; When the temperature is less than 36℃, set the speed of the variable frequency fans in operation to the lowest speed. According to the fan start-up sequence, when the number of fans in operation is greater than 8, stop the last group of industrial frequency fans started every 6 minutes. When the number of fans in operation is less than or equal to 8, stop the last group of variable frequency fans started every 6 minutes until only the first group of variable frequency fans is running. When the inlet valve temperature of the current converter valve is less than 34℃ and only the first group of variable frequency fans is running, stop the first group of variable frequency fans after running for 6 minutes.

[0102] like Figure 3 As shown, this embodiment also provides an automatic control system for an external cooling fan of a valve cooling system of a UHV converter station, including:

[0103] The mode selection module 10 obtains the current ambient temperature of the external air cooling device, and selects the corresponding cooling mode to control the inlet valve temperature of the current converter valve according to the current ambient temperature of the external air cooling device, wherein the number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence in each cooling mode is proportional to the current ambient temperature of the external air cooling device;

[0104] The control module 20 obtains the current inlet valve temperature of the converter valve and the load value of the ultra-high voltage converter station. Each cooling mode determines the start and stop time of each group of external cooling fans according to the current inlet valve temperature of the converter valve and the load value of the ultra-high voltage converter station, and controls the external cooling fans in groups to control the inlet valve temperature of the current converter valve to be within a preset range.

[0105] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0106] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0107] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0108] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0109] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An automatic control method for an external cooling fan of a valve cooling system of a UHV converter station, characterized in that: The following steps are involved: The current ambient temperature of the external air cooling device is obtained, and according to the current ambient temperature of the external air cooling device, the corresponding cooling mode is selected to control the inlet valve temperature of the current converter valve, wherein the number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence in each cooling mode is proportional to the current ambient temperature of the external air cooling device; The current inlet valve temperature of the converter valve and the load value of the UHV converter station are obtained. For each cooling mode, the start and stop time of each group of external cooling fans are determined according to the current inlet valve temperature of the converter valve and the load value of the UHV converter station. The external cooling fans are grouped and controlled to control the inlet valve temperature of the current converter valve within a preset range.

2. The automatic control method for the external cooling fan of the valve cooling system of the UHV converter station according to claim 1 is characterized in that: The method of selecting a corresponding cooling mode to control the inlet valve temperature of the current converter valve according to the current ambient temperature of the external air cooling device includes: If the current ambient temperature of the external air-cooling equipment is greater than or equal to the medium temperature preset value, the first cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group of industrial frequency fans, where N is the total number of variable frequency fans, M is the total number of industrial frequency fans, The start-up sequence of the first cooling mode is: synchronously start the i1th group of variable frequency fans and the i1th group of industrial frequency fans, start each group of external cooling fans in sequence according to the sequence of each group until all the variable frequency fans have started, and then start the remaining groups of industrial frequency fans in sequence. If the current ambient temperature of the external air-cooling equipment is greater than the low temperature preset value and less than the medium temperature preset value, the second cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group power frequency fan; The startup sequence of the second cooling mode is: synchronously start the i b Group variable frequency fan and the i b Start the power frequency fans of each group in sequence, and start the external cooling fans of each group in sequence until all the variable frequency fans are started, and then start the remaining power frequency fans in sequence. If the current ambient temperature of the external air-cooled equipment is less than or equal to the low temperature preset value, the third cooling mode is used to control the inlet valve temperature of the current converter valve, and the external cooling fan is divided into Variable frequency fan and Group power frequency fan; The starting sequence of the third cooling mode is: start each group of variable frequency fans in sequence according to the sequence of each group, until all the variable frequency fans are started, and then start each group of industrial frequency fans in sequence.

3. The automatic control method for the external cooling fan of the valve cooling system of the UHV converter station according to claim 2 is characterized by: The stopping order of the first cooling mode, the second cooling mode and the third cooling mode is in the reverse order of their starting order.

4. The automatic control method for the external cooling fan of the valve cooling system of the UHV converter station according to claim 2 is characterized by: If the current ambient temperature of the external air cooling device is greater than or equal to the medium temperature preset value, the first cooling mode is used to control the inlet valve temperature of the current converter valve, including: When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first group of industrial frequency fans and the first group of variable frequency fans are started after a preset start time delay; When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, after the i1th group of industrial frequency fans or the i1th group of variable frequency fans have run for the preset start time, the i1+1th group of industrial frequency fans and the i1+1th group of variable frequency fans are started. Until The frequency conversion fans of the j1st group are all started. After the preset start time of the power frequency fans of the j1st group, the power frequency fans of the j1+1st group are started. When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fans in operation is greater than n1, the last started group of industrial frequency fans is stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fans in operation is less than or equal to n1, the last started group of industrial frequency fans and a group of variable frequency fans are stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the current inlet valve temperature of the converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after the preset stop time.

5. The automatic control method for the external cooling fan of the valve cooling system of the UHV converter station according to claim 3 is characterized by: If the current ambient temperature of the external air cooling device is greater than the low temperature preset value and less than the medium temperature preset value, the second cooling mode is used to control the inlet valve temperature of the current converter valve, including: When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first group of industrial frequency fans and the first group of variable frequency fans are started after a preset start time delay; When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, the i2+1th group of industrial frequency fans and the i2+1th group of variable frequency fans are started. Until The frequency conversion fans of the j2nd group are all started. After the preset start time of the power frequency fans of the j2nd group, the power frequency fans of the j2+1th group are started. When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fans in operation is greater than n1, the last started group of industrial frequency fans is stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the number of fans in operation is less than or equal to n1, the last started group of industrial frequency fans and a group of variable frequency fans are stopped for each preset stop time until only the first group of industrial frequency fans and the first group of variable frequency fans are running. When the current inlet valve temperature of the converter valve is less than 34°C and only the first group of industrial frequency fans and the first group of variable frequency fans are running, the first group of industrial frequency fans and the first group of variable frequency fans are stopped after the preset stop time.

6. The automatic control method for the external cooling fan of the valve cooling system of the UHV converter station according to claim 4 is characterized by: If the current ambient temperature of the external air cooling device is less than or equal to the low temperature preset value, the third cooling mode is used to control the inlet valve temperature of the current converter valve, including: When the inlet valve temperature of the current converter valve is greater than or equal to 36°C, the first set of variable frequency fans is started after a preset start time delay; When the current inlet valve temperature of the converter valve is greater than or equal to 39°C, after the i3th group of variable frequency fans runs for the preset start time, the i3+1th group of variable frequency fans is started. Until all the variable frequency fans in group n3 are started, after the preset start time of the industrial frequency fans in group j3, the industrial frequency fans in group j3+1 are started. When the current inlet valve temperature of the converter valve is less than 36°C, the speed of the variable frequency fan in operation is set to the lowest speed. According to the fan start-up sequence, when the number of fan groups in operation is greater than n3 groups, the last group of industrial frequency fans started is stopped for each preset stop time. When the number of fan groups in operation is less than or equal to n3 groups, the last group of variable frequency fans started is stopped for each preset stop time until only the first group of variable frequency fans is running. When the inlet valve temperature of the current converter valve is less than 34°C and only the first set of variable frequency fans is running, the first set of variable frequency fans will be stopped after the preset stop time.

7. The automatic control method for the external cooling fan of the valve cooling system of the UHV converter station according to claim 6 is characterized by: The preset start time includes: If the current UHV converter station load value is greater than the target load value, the preset start time is a set time within the high load start range centered at 100 seconds; If the current load value of the UHV converter station is less than or equal to the target load value, the preset start time is a set time within the low load start range centered at 60 seconds.

8. The automatic control method for the external cooling fan of the valve cooling system of the UHV converter station according to claim 6 is characterized by: The preset stop time is 6 minutes.

9. The automatic control method for external cooling fan of valve cooling system of UHV converter station according to claim 1 is characterized by: Based on the current inlet valve temperature of the converter valve and the inlet valve temperature set value, the output frequency of the inverter is adjusted using the PID control principle to control the speed of the variable frequency fan.

10. An automatic control system for external cooling fans of a UHV converter station valve cooling system, characterized in that: include: The mode selection module obtains the current ambient temperature of the external air cooling device, and selects the corresponding cooling mode to control the inlet valve temperature of the current converter valve according to the current ambient temperature of the external air cooling device. The number of variable frequency fans and industrial frequency fans in each group of external cooling fans started in sequence in each cooling mode is proportional to the current ambient temperature of the external air cooling device. The control module obtains the current inlet valve temperature of the converter valve and the load value of the UHV converter station. Each cooling mode determines the start and stop time of each group of external cooling fans according to the current inlet valve temperature of the converter valve and the load value of the UHV converter station, and controls the external cooling fans in groups to control the inlet valve temperature of the current converter valve to be within a preset range.

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