CN109213221B - Temperature control method of direct-current power transmission converter valve combined type external cooling system - Google Patents
Temperature control method of direct-current power transmission converter valve combined type external cooling system Download PDFInfo
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- CN109213221B CN109213221B CN201710516797.4A CN201710516797A CN109213221B CN 109213221 B CN109213221 B CN 109213221B CN 201710516797 A CN201710516797 A CN 201710516797A CN 109213221 B CN109213221 B CN 109213221B
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1927—Control of temperature characterised by the use of electric means using a plurality of sensors
- G05D23/193—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces
- G05D23/1931—Control of temperature characterised by the use of electric means using a plurality of sensors sensing the temperaure in different places in thermal relationship with one or more spaces to control the temperature of one space
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Abstract
The invention relates to a temperature control method of a direct-current transmission converter valve combined type external cooling system, which is characterized in that only one starting set value is set when a fan of an air cooler, a fan of a cooling tower and a spray pump of the cooling tower are started in groups, and the fan of the air cooler, the fan of the cooling tower and the spray pump of the cooling tower are controlled to start and stop by detecting the valve inlet temperature of a real-time converter valve and comparing the valve inlet temperature with the starting set value. The invention simplifies the setting process of the starting set value, and simultaneously, only needs to be compared with one starting value when the system runs, thereby reducing the difficulty of setting the set value on site and the error condition when the system runs.
Description
Technical Field
The invention relates to the field of high-voltage direct-current power transmission, in particular to a temperature control method of a composite external cooling system of a direct-current power transmission converter valve.
Background
The converter valve is used as a core unit of a direct current transmission project, and large power consumption heat productivity can be generated in the operation process, which is not beneficial to the stable operation of the converter valve equipment, so that an additional cooling system is required to be equipped for assisting in cooling. The existing outdoor heat exchange equipment of the cooling system mainly comprises an air cooler and a closed cooling tower, and the closed cooling tower is usually adopted for areas with rich water resources; for arid regions with water shortage, air coolers are often adopted, but when extreme weather occurs in the regions, the cooling requirements cannot be met only by the air coolers, so that the cooling requirements are met by adopting a combined cooling mode of serially connecting the air coolers with closed cooling towers.
The existing converter valve composite external cooling system is provided with a variable frequency fan and a power frequency fan, and all the fans are controlled in groups. When the inlet valve temperature is higher than a first starting set value, a first group of variable frequency fans are started in a delayed mode; when the inlet valve temperature is higher than a second starting set value, a second group of power frequency fans are started in a delayed mode; the rest power frequency fans are sequentially started according to the control logic and the starting set values; when the temperature of the inlet valve is higher than the starting value of the closed cooling tower, starting the closed cooling tower; when the inlet valve temperature is lower than the stop value of the closed cooling tower, stopping the closed cooling tower; when the inlet valve temperature is lower than a first stop set value, stopping the first group of power frequency fans in a delayed manner; and the rest fans exit the operation in sequence according to the stop set values according to the control logic. According to the control strategy, the air cooler and the closed cooling tower can be started and stopped correctly according to the inlet valve temperature, and the inlet valve temperature can be controlled within a certain range, so that the reliable operation of the cooling system is ensured.
The control logic is provided with a plurality of starting set values, and the fan and the cooling tower of the air cooler are started in sequence according to the starting set values, however, because the starting set values are excessively set, the difficulty of setting the set values on site is increased, if errors occur in the process of setting the set values, errors are easily caused when the system runs, and meanwhile, the control logic enables the existing converter valve composite external cooling system to generate the phenomena that the fan of the air cooler is frequently started and stopped and the closed cooling tower is frequently switched, so that the inlet valve temperature fluctuation is large, a monitoring picture generates a large amount of fan start-stop messages, and the stable running of the cooling system and the converter valve is not facilitated.
Disclosure of Invention
The invention aims to provide a temperature control method of a composite external cooling system of a direct-current transmission converter valve, which is used for solving the problems of setting difficulty and high possibility of errors caused by excessive starting set values of the cooling system in the prior art.
In order to achieve the above object, the present invention provides a temperature control method for a dc power transmission converter valve composite external cooling system, comprising:
if the inlet valve temperature of the converter valve is detected to be greater than a first set value, controlling the air cooler to be put into operation;
when the air cooler operates, detecting the inlet valve temperature in a set period, judging whether the real-time inlet valve temperature is greater than a second set value, and if so, adding a group of fans of the air cooler to operate; if the air quantity is smaller than the preset value, stopping running the fans of the group of air coolers; the first set value is less than the second set value.
Further, when only the fans of the remaining air coolers are operated, if the inlet valve temperature of the converter valve is detected to be lower than a third set value, the fans of the remaining air coolers are stopped; the air cooler stops operating, and the third set point is less than the first set point.
Further, the valve inlet temperature is detected in a set period, and if the real-time valve inlet temperature is greater than a second set value and all fans of the air coolers are operated, the cooling tower is put into operation; when the cooling tower operates, detecting the inlet valve temperature in a set period, judging whether the real-time inlet valve temperature is greater than a second set value, and if so, adding a group of spraying pumps of the cooling tower to operate; and if the temperature is less than the second set value, stopping operating the spraying pumps of the group of cooling towers.
Further, if the spray pumps of all the cooling towers are operated and the real-time inlet valve temperature is detected to be greater than a fourth set value, controlling the fans of the cooling towers to be operated;
when the cooling tower fans operate, detecting the inlet valve temperature in a set period, judging whether the real-time inlet valve temperature is greater than a fifth set value, and if so, adding a group of cooling tower fans to operate; if the air flow rate is less than the fifth set value, stopping running the fans of the group of cooling towers; the fourth setting value is smaller than the fifth setting value.
Further, when only one group of fans of the cooling tower is left to operate, if the inlet valve temperature of the converter valve is detected to be lower than a sixth set value, the fans of the remaining cooling tower are stopped; and the cooling tower fan stops running, and the sixth set value is smaller than the fourth set value.
Furthermore, a fan in the air cooler is a variable frequency fan or a power frequency fan.
Furthermore, when a group of variable frequency fans of the air cooler are put into use, the operating frequency is gradually increased; when the frequency reaches the maximum, the fans of the next group of air coolers are put into operation.
Furthermore, in the air cooler, firstly, the variable frequency fan is put into operation, and when all the variable frequency fans of the air cooler are put into operation and reach the maximum frequency, the power frequency fan of the air cooler is put into operation again.
Furthermore, the fans of the cooling towers are variable frequency fans, after the variable frequency fans of the cooling towers are put into use, the operating frequency is gradually increased, and when the frequency reaches the maximum, the variable frequency fans of the next group of cooling towers are put into use.
Furthermore, the third set value is smaller than the first set value, the second set value is smaller than the sixth set value, and the fourth set value is smaller than the fifth set value.
The invention has the beneficial effects that: only one starting set value is set when the fan of the air cooler, the fan of the cooling tower and the spray pump of the cooling tower are started in groups, so that the setting process of the starting set value is simpler, and meanwhile, the setting process only needs to be compared with one starting value when a system runs, so that the error condition of the system is reduced.
Meanwhile, the proportion of the variable frequency fan and the power frequency fan is adjusted, and a closed-loop control mode is added for controlling the operating frequency of the variable frequency fan, so that the control effect is more accurate, and the inlet valve temperature change of the converter valve is smoother.
Drawings
FIG. 1 is a system structure diagram of a DC power transmission converter valve composite external cooling system according to the present invention;
FIG. 2 is a flow chart of a temperature control method of a DC power transmission converter valve composite external cooling system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
On the basis of the original converter valve composite external cooling system, the invention changes the configuration proportion of a variable frequency fan and a power frequency fan in an air cooler, and simultaneously adjusts a control strategy so as to solve the problems of difficult setting and easy error caused by excessive starting set values of the original cooling system.
Fig. 1 is a structural diagram of a converter valve composite external cooling system, which includes an air cooler and two closed cooling towers (e.g., a1 and a2 in fig. 1), and the air cooler and the two closed cooling towers are connected through a pipeline. According to the actual cooling capacity, the air cooler is configured with a certain number of tube bundles, and each tube bundle is configured with a proper number of variable frequency fans (such as K1, K2, K3 and the like in the figure 1) and power frequency fans (such as G1, G2 and the like in the figure 1), wherein the variable frequency fans are controlled in multiple groups according to actual needs, and the power frequency fans are controlled in multiple groups. Each cooling tower is provided with 2 spray pumps (for example, A1 in FIG. 1 comprises P01 and P02, A2 comprises P03 and P04) and 2 variable frequency fans (for example, A1 in FIG. 1 comprises L1 and L2, A2 comprises L3 and L4), wherein the 2 spray pumps are mutually standby, namely, P01 and P02 in FIG. 1 are mutually standby, P03 and P04 are mutually standby, and the variable frequency fans are controlled in multiple groups.
The converter valve composite external cooling system can monitor the inlet valve temperature of a converter valve in a converter station in real time, monitor the switching state of a fan in an air cooler and the switching state of a spray pump and the fan in a cooling tower, monitor the operating frequency of a variable frequency fan, reasonably control the switching of the fan and the spray pump in the fan and the cooling tower in the air cooler by comparing the real-time inlet valve temperature value with a set value, and simultaneously control the output frequency of the variable frequency fan, thereby adjusting the inlet valve temperature of the converter valve.
According to the temperature adjusting method of the converter valve combined type external cooling system, a worker can set proper preset values according to the actual condition of a converter station, and the preset values comprise a first set value for controlling the starting of a fan of an air cooler, a second set value which is a target value of inlet valve temperature to be controlled when the fan of the air cooler is put into operation, a third set value for controlling the stopping of the fan of the air cooler, a fourth set value for controlling the starting of the fan of a cooling tower, a fifth set value which is a target value of inlet valve temperature to be controlled when the fan of the cooling tower is put into operation, and a sixth set value for controlling the stopping of the fan of the cooling tower. The relationship of these set values should satisfy: the third set value is larger than the first set value, the second set value is larger than the second set value, the sixth set value is larger than the fourth set value, and the fifth set value is larger than the sixth set value.
When the environment temperature rises or the converter valve operates in a power-up mode, the temperature of the inlet valve rises along with the temperature of the inlet valve, and the converter valve composite external cooling system can control the air cooler and the cooling tower to operate according to the temperature value of the inlet valve. As shown in fig. 2, the specific implementation steps are as follows:
(1) monitoring the inlet valve temperature of the converter valve in real time, and when the inlet valve temperature is judged to be greater than a first set value and less than a second set value, delaying to output a starting signal and an output frequency to a frequency conversion device of a first group of air cooler frequency conversion fans, wherein the frequency conversion device controls the first group of frequency conversion fans to finish starting;
(2) when the inlet valve temperature generated again is judged to be greater than a second set value and the operating frequency of the operated variable frequency fan in the air cooler is the highest frequency value, a starting signal and the output frequency are output to a variable frequency device of the variable frequency fan of the next group of air coolers in a delayed mode, and the variable frequency device controls the group of variable frequency fans to finish starting;
(3) repeatedly executing the step (2) until all the variable frequency fans of the air cooler are started;
(4) when the operation frequency of the operated air cooler frequency conversion fan is monitored to be the highest frequency value, all the operable air cooler frequency conversion fans are operated completely, and meanwhile, the inlet valve temperature of the converter valve is greater than a second set value, a starting signal is output in a delayed mode to the next group of air cooler power frequency fans, and the group of power frequency fans are controlled to be started directly;
(5) repeatedly executing the step (4) until all the air cooler power frequency fans are started;
(6) when all fans of the operable air coolers are started to operate, the operating frequency of the frequency conversion fan of the operated air cooler is the highest frequency value, and meanwhile, the valve inlet temperature of the converter valve is still greater than a second set value, the cooling requirement of the converter valve cannot be met only by the air cooler, the cooling tower needs to be put into for auxiliary cooling, a starting signal is output to the spray pump of the cooling tower in a delayed mode, and the first group of spray pumps is directly controlled to complete starting;
(7) repeatedly executing the step (6) until the second group of spraying pumps are started;
(8) when all fans of the operable air cooler are started to operate and the operating frequency of the variable-frequency fan of the air cooler is the highest frequency value, two groups of spraying pumps in the cooling tower work simultaneously, and the inlet valve temperature of the converter valve is greater than a fourth set value, a starting signal and the output frequency are output to a variable-frequency device of a first group of variable-frequency fans in the cooling tower in a delayed mode, and the variable-frequency device controls the first group of variable-frequency fans to finish starting;
(9) when all fans of the operable air cooler are started to operate, the operating frequency of the variable-frequency fan of the air cooler is the highest frequency value, the spray pump in the cooling tower works, the operating frequency of the variable-frequency fan of the operated cooling tower is the highest frequency value, and the inlet valve temperature of the converter valve is greater than a fifth set value, a starting signal and the output frequency are output to the variable-frequency device of the variable-frequency fan of the next group of cooling tower in a delayed mode, and the variable-frequency device controls the variable-frequency fan of the cooling tower to finish starting;
(10) and (5) repeatedly executing the step (9) until all the variable frequency fans of the cooling tower are started.
When the power of the converter valve is reduced or the ambient temperature is reduced, the temperature of the inlet valve is reduced, and the composite external cooling system of the converter valve can control the cooling tower and the air cooler to exit from operation according to the temperature value of the inlet valve. As shown in fig. 2, the specific implementation steps are as follows:
(1) when all fans of the operable air coolers are operated, the operating frequency of the variable-frequency fans of the air coolers is the highest frequency value, the spray pumps in the cooling towers work, and the operating frequency of the variable-frequency fans of the operated cooling towers is the lowest frequency value, at the moment, if the inlet valve temperature of the converter valve is smaller than a fifth set value, the control signal of the variable-frequency device of the variable-frequency fan of the cooling tower which is started to operate firstly is delayed to reset, and the variable-frequency device controls the variable-frequency fans of the cooling tower to quit operation;
(2) repeatedly executing the step (1) until only one group of cooling tower variable frequency fans are in an operating state;
(3) when all fans of the operable air cooler are operated and the operating frequency of the variable-frequency fan of the air cooler is the highest frequency value, two groups of spraying pumps in the cooling tower work, and only one group of variable-frequency fans of the cooling tower is left to work and the operating frequency is the lowest frequency value, if the inlet valve temperature of the converter valve is lower than a sixth set value at the moment, the control signal of the variable-frequency device of the variable-frequency fan of the cooling tower is delayed to reset, and the variable-frequency device controls the group of fans of the cooling tower to stop operating;
(4) when all fans of the operable air cooler are operated, the operating frequency of the variable frequency fans of the air cooler is the lowest frequency value, all cooling tower variable frequency fans quit operating, and if the inlet valve temperature of the converter valve is lower than a second set value, the control signal of the cooling tower spray pump which is started firstly is reset in a delayed mode, and the group of spray pumps is directly controlled to quit operating;
(5) repeatedly executing the step (4) until all the spray pumps stop operating;
(6) when all fans of the air cooler capable of running are in running, the running frequency of the variable frequency fan of the air cooler is the lowest frequency value, all the spray pumps and the variable frequency fans of all the cooling towers are in running quit, if the inlet valve temperature of the converter valve is smaller than a second set value, the starting signal of the first started power frequency fan of the air cooler is reset in a delayed mode, and the group of power frequency fans are controlled to quit running;
(7) repeatedly executing the step (6) until all the air cooler power frequency fans quit operation;
(8) when only the air cooler variable frequency fan is in operation, the operating frequency of the air cooler variable frequency fan is the lowest frequency value, and meanwhile, the inlet valve temperature of the converter valve is smaller than a second set value, the starting signal of the frequency conversion device of the air cooler variable frequency fan which is started firstly is delayed to reset, and the frequency conversion device directly controls the group of variable frequency fans to quit operation;
(9) repeatedly executing the step (8) until only one group of air cooler variable frequency fans are in operation;
(10) when only one group of air cooler variable frequency fans is in work and the operation frequency is the lowest frequency value, if the inlet valve temperature of the converter valve is smaller than a third set value, the starting signal of the variable frequency device of the air cooler variable frequency fans is delayed to reset, and the variable frequency device directly controls the group of variable frequency fans to quit the operation.
The specific implementation mode related to the invention is given above, and the blower of the air cooler and the blower of the cooling tower are sequentially started and stopped by the spray pump by using a small amount of starting set values, so that the field setting of the set values is simpler, and meanwhile, the condition that the set values are too much and are easy to make mistakes in the actual operation process is also avoided.
The invention is not limited to the described embodiments, such as variations in the type and number of air coolers or cooling tower fans, and the resulting solution is fine tuned to the above described embodiments and still fall within the scope of the invention.
Claims (9)
1. A temperature control method of a direct-current transmission converter valve combined type external cooling system is characterized by comprising the following steps:
if the inlet valve temperature of the converter valve is detected to be greater than a first set value, controlling the air cooler to be put into operation; controlling the air coolers to be put into operation specifically namely controlling fans of the first group of air coolers to be put into operation;
the air cooler comprises a plurality of groups of fans, when the air cooler operates, the inlet valve temperature is detected in a set period, whether the real-time inlet valve temperature is greater than a second set value or not is judged, if so, the fans of one group of air coolers are added to operate until all the fans of the air cooler operate; if the air quantity is smaller than the preset value, stopping operating the fans of the air coolers until only the fans of the air coolers are operated; the first set value is smaller than the second set value;
when only fans of one group of air coolers are operated, if the inlet valve temperature of the converter valve is detected to be lower than a third set value, the fans of the remaining air coolers are stopped, and the air coolers are stopped; the third set value is less than the first set value.
2. The temperature control method of the direct-current transmission converter valve composite external cooling system according to claim 1, characterized by comprising the following steps: detecting the inlet valve temperature in a set period, and if the real-time inlet valve temperature is greater than a second set value and all fans of the air coolers are operated, putting the cooling tower into operation; when the cooling tower operates, detecting the inlet valve temperature in a set period, judging whether the real-time inlet valve temperature is greater than a second set value, and if so, adding a group of spraying pumps of the cooling tower to operate; and if the temperature is less than the second set value, stopping operating the spraying pumps of the group of cooling towers.
3. The temperature control method of the direct-current transmission converter valve composite external cooling system according to claim 2, characterized by comprising the following steps: if the spray pumps of all the cooling towers are operated and the real-time inlet valve temperature is detected to be greater than a fourth set value, controlling the fans of the cooling towers to be put into operation;
when the cooling tower fans operate, detecting the inlet valve temperature in a set period, judging whether the real-time inlet valve temperature is greater than a fifth set value, and if so, adding a group of cooling tower fans to operate; if the air flow rate is less than the fifth set value, stopping running the fans of the group of cooling towers; the fourth setting value is smaller than the fifth setting value.
4. The temperature control method of the DC power transmission converter valve composite external cooling system according to claim 3, characterized in that: when only one group of fans of the cooling tower is operated, stopping the fans of the remaining cooling tower if the inlet valve temperature of the converter valve is detected to be lower than a sixth set value; and the cooling tower fan stops running, and the sixth set value is smaller than the fourth set value.
5. The temperature control method of the DC transmission converter valve composite external cooling system according to claim 4, characterized in that: and the fan in the air cooler is a variable frequency fan or a power frequency fan.
6. The temperature control method of the DC transmission converter valve composite external cooling system according to claim 5, characterized in that: when a group of variable frequency fans of the air cooler are put into use, the operating frequency is gradually increased; when the frequency reaches the maximum, the fans of the next group of air coolers are put into operation.
7. The temperature control method of the DC power transmission converter valve composite external cooling system according to claim 6, characterized in that: in the air cooler, firstly, a variable frequency fan is put into operation, and when all the variable frequency fans of the air cooler are put into operation and reach the maximum frequency, a power frequency fan of the air cooler is put into operation again.
8. The temperature control method of the DC transmission converter valve composite external cooling system according to claim 7, characterized in that: the fan of the cooling tower is a variable frequency fan, after the variable frequency fan of the cooling tower is put into use, the operating frequency is gradually increased, and when the frequency reaches the maximum, the variable frequency fan of the next group of cooling towers is put into use.
9. The temperature control method of the DC power transmission converter valve composite external cooling system according to claim 8, characterized in that: the third set value is less than the first set value, the second set value is less than the sixth set value, and the fourth set value is less than the fifth set value.
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| CN201710516797.4A CN109213221B (en) | 2017-06-29 | 2017-06-29 | Temperature control method of direct-current power transmission converter valve combined type external cooling system |
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| CN201710516797.4A CN109213221B (en) | 2017-06-29 | 2017-06-29 | Temperature control method of direct-current power transmission converter valve combined type external cooling system |
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| CN111587030B (en) * | 2020-04-27 | 2023-05-12 | 南京南瑞继保电气有限公司 | Control method of converter valve cooling system air cooler, electronic equipment and cooling system |
| CN113187756A (en) * | 2021-06-15 | 2021-07-30 | 河南艾牧智能设备有限公司 | Livestock and poultry house temperature gentle control method |
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| CN101634866A (en) * | 2009-02-10 | 2010-01-27 | 广州市高澜水技术有限公司 | Control system of pure water cooling device of high voltage direct current (HVDC) transmission converter valve |
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Address after: No. 1666, Jinlong street, economic and Technological Development Zone, Xuchang City, Henan Province Applicant after: Henan Jingrui Cooling Technology Co., Ltd Address before: Xuchang City, Henan province 461000 Sunshine Avenue XJ Electric City Building 2 Applicant before: XUCHANG XUJI JINGRUI TECHNOLOGY Co.,Ltd. |
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