CN112145469A - Phase modulator cooling air temperature control method - Google Patents
Phase modulator cooling air temperature control method Download PDFInfo
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- CN112145469A CN112145469A CN202011023144.0A CN202011023144A CN112145469A CN 112145469 A CN112145469 A CN 112145469A CN 202011023144 A CN202011023144 A CN 202011023144A CN 112145469 A CN112145469 A CN 112145469A
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- cooling air
- value
- temperature
- air temperature
- cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/30—Control parameters, e.g. input parameters
- F05D2270/303—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2270/00—Control
- F05D2270/70—Type of control algorithm
- F05D2270/706—Type of control algorithm proportional-integral-differential
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a phase modulator cooling air temperature control method, which comprises the following steps: adding a correction quantity delta SP of a cooling fan starting and stopping the cooling fan to a set value SP of the cooling air temperature to obtain a calculated value A; subtracting the calculated value A from the cooling air temperature process value PV to obtain a temperature deviation signal delta t; 3) inputting the delta t into the PID controller, calculating PID operation output u based on preset control parameters, and applying the PID operation output u to the air temperature regulating valve to regulate the temperature of cooling air. The control method of the invention enables the temperature-reducing water regulating valve to respond to the influence of the internal heat production change of the phase modifier on the temperature of the cooling air when the cooling fan of the mechanical ventilation cooling tower is started and stopped in an interlocking way, so as to carry out continuous deviation regulation, and also can quickly respond to the sudden temperature change of the external cold water caused by the great vapor phase change heat absorption due to the starting and stopping of the fan, thereby ensuring that the temperature of the cooling air maintains higher control precision, inhibiting the internal disturbance of the system and improving the operation stability of the phase modifier.
Description
Technical Field
The invention provides a control method capable of inhibiting the influence of starting and stopping a cooling fan on the temperature of cooling air of a camera, belonging to the technical field of automatic control of thermotechnical engineering.
Background
In recent years, extra-high voltage transmission systems have caused changes in grid characteristics. Due to the slow response speed of conventional electric and electronic equipment, sufficient reactive support cannot be rapidly provided for a system during a fault, so that the voltage stability of the system is reduced, and the inherent reactive output characteristic of the phase modulator can just compensate the defect. Therefore, the phase modulator is re-enabled in the era of 'large power grid'. Conventional control strategies for phase modulation systems require specialized maintenance teams and more human resources, while the electrical grid has relatively insufficient technical reserves for rotating equipment and thermodynamic systems. In order to solve the contradiction, the unattended function needs to be realized, the automation level of the control strategy of the main and auxiliary machinery equipment of the phase modulator is improved, and the system is kept to operate in the optimal interval on the premise of ensuring the normal operation of the system. The invention mainly aims at the research results of a phase modifier cooling air system.
The phase modifier stator core adopts radial full air-out structure, except the part of being qualified for the next round of competitions, the phase modifier stator is along axial central point symmetry, and the concrete wind path of half phase modifier of leading-out terminal is: cooling air is blown in from an air inlet of the end cover by a fan, one path of cooling air enters an air gap and flows to the back of the iron core through a radial ventilation channel of the stator iron core to cool the stator iron core body, the step section and the aluminum pressing ring; and the other path bypasses the end part of a stator coil at a wire outlet end to cool the copper plate and the sleeve of the stator outlet, then flows into the back of the stator, and the two paths of gas enter the air cooler from the air outlet of the machine base and are output after being cooled, so that the circulation cooling of the phase change machine is realized.
The cooling medium in the air cooler is external cold water, and the cooling air pipeline and the external cold water pipeline transfer heat in the air cooler to complete heat exchange between high-temperature cold water air and low-temperature external cold water so as to maintain the refrigerating capacity of the cooling air.
The external cold water can be tap water, and the cooling requirement of cooling air can be met only by matching a natural evaporation cooling mode with forced phase change heat absorption (realized by linkage of a cooling fan). The forced phase change heat absorption mode starts the cooling fan through interlocking, and increases the amount of liquid water phase changed into gaseous water to promote heat absorption, thereby quickly reducing the temperature of external cold water, and improving the cooling capacity of the external cold water for a short time so as to meet the requirement of heat exchange of cooling air of the phase modulator.
The air cooler is provided with an air temperature adjusting valve, and the opening degree of the air temperature adjusting valve is adjusted to control the water inlet flow of external cold water in the air cooler so as to adjust the temperature of cooling air after heat exchange and keep the cooling air basically stable. The conventional control mode is as shown in fig. 1, and the PID controller performs single-loop control on the air temperature regulating valve according to the measured value of the cooling air temperature fed back by the temperature transmitter and the given value of the cooling air temperature, so as to regulate the outlet air temperature of the air cooler.
In the corresponding external cold water system, frequent starting of the cooling fan is an occasional internal disturbance, which causes fluctuation of the temperature of external cold water and further fluctuation of the temperature of cooling air. Especially in hot summer weather, the frequency of occurrence of the disturbance increases, which causes continuous large oscillation of the opening command of the cooling air adjustment valve (as shown in fig. 2). The oscillation is unstable from the viewpoint of automatic quality and increases the probability of the failure of the regulating valve.
Disclosure of Invention
The technical purpose of the invention is as follows: the cooling air temperature control strategy of the phase modifier is optimized, and the cooling air temperature optimization control method can enable the air temperature adjusting valve to control and respond to the temperature change of cooling air to carry out continuous deviation adjustment and also to quickly respond to the temperature change of phase change and heat absorption of water vapor of the external cold water when the temperature of the external cold water is changed quickly, so that the temperature of the cooling air is guaranteed to maintain small fluctuation, the temperature of the cooling air is stabilized, the internal disturbance of a system is restrained, and the operation stability of the phase modifier is improved.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:
a phase modulator cooling air temperature control method used in the control of a PID controller to an air cooler air temperature regulating valve is characterized by comprising the following steps:
1) adding a cooling air temperature set value SP at the air outlet side of the air cooler to a correction quantity delta SP of the cooling air set value when a cooling fan is started and stopped to obtain a calculated value A;
2) subtracting the calculated value A from a cooling air temperature process value PV to obtain a temperature deviation signal delta t, wherein the cooling air temperature process value PV is an actual measured value of the temperature of the cooling air at the air outlet side;
3) inputting the delta t into the PID controller, and calculating the PID operation output u by the PID controller based on a preset control parameter;
4) the PID operation output u is acted on the air temperature regulating valve to realize the regulation of the cooling air temperature at the air outlet side of the air cooler;
in the step 1) above:
the correction quantity delta SP of the set value of the cooling water temperature by starting and stopping the cooling fan is determined by a dynamic feedforward technology based on actual differentiation, and the correction quantity delta SP is as follows:
△SP＝(△SP+)-(△SP-)
in the formula, the delta SP + is the correction quantity delta SP + of the set value of the cooling air temperature by the air stopping machine, and the delta SP-is the correction quantity delta SP-of the set value of the cooling air temperature by the air starting machine;
(△SP+)＝STEP+
(△SP-)＝STEP-
when the STEP + is used for stopping the fan, the actual differential module is selected according to the STEP change from 0 to D;
the STEP is an actual differential module selected for the STEP change from 0 to C when the fan is started;
the transfer functions are respectively:
in the above formula, TdFor differential time when stopping the fan, TCThe differential time is the differential time when the fan is started, and S is a Laplace operator;
Td＝70～90sec，D＝4～6
TC＝300～400sec，C＝2～5。
further, the value of the proportional gain Kp in the control parameters of the PID controller is set to a first preset value B1, the value of the integration time Ti is set to a second preset value B2, and the value of the derivative coefficient Kd is set to a third preset value B3.
Furthermore, the preset value B1 of the proportional gain Kp is 0.2-0.3, and the preset value B2 of the integration time Ti is 10-20 s.
Further, the third preset value B3 is 0.
Has the advantages that:
the phase modifier cooling air temperature control method can inhibit the interference of starting and stopping the cooling fan on the temperature of the cooling air of a phase modifier, enables the temperature reduction water regulating valve to respond to the influence of the internal heat production change of the phase modifier on the temperature of the cooling air when the cooling fan of a mechanical ventilation cooling tower is started and stopped in a linkage manner, carries out continuous deviation regulation, can quickly respond to the sudden change of the temperature of external cold water caused by large-amplitude water vapor phase change heat absorption due to the starting and stopping of the fan, ensures that the temperature of the cooling air maintains higher control precision, inhibits the internal interference of a system, and improves the operation stability of the phase modifier. And the frequent action of the air temperature regulating valve can be reduced, and the service life of the regulating valve is prolonged.
Drawings
FIG. 1 is a schematic diagram of a conventional control method for the temperature of cooling air;
FIG. 2 is a schematic view of the cooling air temperature regulation quality in a single-loop regulation mode;
FIG. 3 is a flow chart of a control method of the present invention;
FIG. 4 is a schematic diagram of a control method of the present invention.
Detailed Description
To clarify the technical solution and working principle of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.
A phase modulator cooling air temperature control method as shown in fig. 3 and 4 is used in the control of a PID controller of a phase modulator cooling air system to an air temperature regulating valve. The air temperature regulating valve is installed on a water delivery pipeline of external cold water of the air cooler, and the adjustment of the air outlet temperature of cooling air of the air cooler is realized by adjusting the water inlet flow of the external cold water of the cooler.
The specific process of the control method of the embodiment comprises the following steps:
1) adding a correction quantity delta SP of a cooling air temperature set value SP of an air outlet of the air cooler to the set value SP by starting and stopping a cooling fan to obtain a calculated value A;
the correction quantity delta SP is determined by a dynamic feedforward technology based on actual differentiation so as to counteract sudden temperature drop when the fan is started or sudden temperature rise when the fan is stopped, and therefore the influence of the process of starting and stopping the cooling fan on the temperature of cooling air is restrained.
The correction quantity delta SP of the temperature set value by starting and stopping the cooling fan is as follows:
△SP＝(△SP+)-(△SP-)
wherein, the delta SP + is the correction quantity delta SP + of the set value of the cooling air temperature by the air stopping machine, and the delta SP-is the correction quantity delta SP-
(STEP change from 0 to D) blower off time
(Δ SP-) ═ STEP- (STEP change from 0 to C) when the fan is turned on
STEP + is the actual differential module selected for the STEP change from 0 to D when the cooling fan is stopped;
STEP-is the actual differential module selected for the STEP change from 0 to C when the cooling fan is started;
the transfer functions are respectively:
in the above formula, TdFor differential time when stopping the fan, TCThe differential time is the differential time when the fan is started, and S is a Laplace operator;
Td＝70～90sec，D＝4～6
TC＝300～400sec，C＝2～5
2) subtracting the calculated value A from a cooling air temperature process value PV to obtain a temperature deviation signal delta t, wherein the process value PV is a cooling air temperature measured value of an air outlet of the air cooler fed back by the temperature transmitter in real time;
3) inputting the delta t into a PID controller, and calculating the PID operation output u by the PID controller based on a preset control parameter;
the control parameters comprise a proportional gain Kp, an integral time Ti and a derivative coefficient Kd, and the value of the proportional gain Kp is set as a first preset value B1, the value of the integral time Ti is set as a second preset value B2, and the value of the derivative coefficient Kd is set as a third preset value B3. In the embodiment, preferably, the preset value B1 of the proportional gain Kp is set to be 0.2 to 0.3, the preset value B2 of the integration time Ti is set to be 10 to 20s, and the value of the third preset value B3 is set to be 0.
4) And the PID operation output u is acted on the air temperature regulating valve to realize the regulation of the temperature of the cooling air output by the air cooler.
The invention relates to a method for controlling the temperature of cooling air of a phase modulator, which can be directly realized in various Distributed Control Systems (DCS) in a configuration mode. In the practical process, cooling air is subjected to heat exchange with external cold water to maintain the cooling capacity of the 300MVar phase modulation unit which is constructed in a matched manner in a converter station, when the water supply temperature of the external cold water of the phase modulation unit reaches 35 ℃, three cooling fans are delayed for ten seconds to start in a variable frequency mode, the starting frequency is quickly increased to 30Hz, and a large amount of heat is absorbed through a water vapor phase change mode, so that the temperature of the external cold water is quickly reduced. When the water temperature is reduced to 30 ℃, the frequency conversion instruction of the cooling fan returns to zero, the three fans are delayed for ten seconds and stop, and the water vapor phase change heat absorption mode is switched to a convection heat exchange mode. When the phase modifier operates in summer high-temperature weather, the temperature of external cold water can enter a range of 30-35 ℃ with high probability, and the conventional control mode faces the internal disturbance of the starting and stopping of a fan with high frequency, so that the stable control of the temperature of cooling air is not facilitated. Before the method is adopted, the temperature of cooling air of the unit fluctuates between (-3) DEG C in most of operation time, and the unit cannot be calmly converged. After the invention is adopted, the fluctuation energy of the cooling air temperature is stably controlled in a range of (-1) DEG C, the accidental internal disturbance generated by the start and stop of the three fans is effectively inhibited, the control precision of the cooling air temperature is improved, the action frequency of the cooling air temperature regulating valve is slowed down, and the service life of the regulating valve is prolonged.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.
Claims (4)
1. A phase modulator cooling air temperature control method used in the control of a PID controller to an air cooler air temperature regulating valve is characterized by comprising the following steps:
1) adding a cooling air temperature set value SP at the air outlet side of the air cooler to a correction quantity delta SP of the cooling air set value when a cooling fan is started and stopped to obtain a calculated value A;
2) subtracting the calculated value A from a cooling air temperature process value PV to obtain a temperature deviation signal delta t, wherein the cooling air temperature process value PV is an actual measured value of the temperature of the cooling air at the air outlet side;
3) inputting the delta t into the PID controller, and calculating the PID operation output u by the PID controller based on a preset control parameter;
4) the PID operation output u is acted on the air temperature regulating valve to realize the regulation of the cooling air temperature at the air outlet side of the air cooler;
in the step 1) above:
the correction quantity delta SP of the set value of the cooling water temperature by starting and stopping the cooling fan is determined by a dynamic feedforward technology based on actual differentiation, and the correction quantity delta SP is as follows:
△SP＝(△SP+)-(△SP-)
in the formula, the delta SP + is the correction quantity delta SP + of the set value of the cooling air temperature by the air stopping machine, and the delta SP-is the correction quantity delta SP-of the set value of the cooling air temperature by the air starting machine;
(△SP+)＝STEP+
(△SP-)＝STEP-
when the STEP + is used for stopping the fan, the actual differential module is selected according to the STEP change from 0 to D;
the STEP is an actual differential module selected for the STEP change from 0 to C when the fan is started;
the transfer functions are respectively:
in the above formula, TdFor differential time when stopping the fan, TCThe differential time is the differential time when the fan is started, and S is a Laplace operator;
Td＝70～90sec，D＝4～6
TC＝300～400sec，C＝2～5。
2. the phase modulation machine cooling air temperature control method according to claim 1, characterized in that:
and setting the value of a proportional gain Kp in the control parameters of the PID controller as a first preset value B1, the value of an integration time Ti as a second preset value B2 and the value of a differential coefficient Kd as a third preset value B3.
3. The phase modulation machine cooling air temperature control method according to claim 2, characterized in that:
the default value B1 of the proportional gain Kp is 0.2-0.3, and the default value B2 of the integral time Ti is 10-20 s.
4. A phase modulation machine cooling air temperature control method according to claim 2 or 3, characterized in that: the third preset value B3 has a value of 0.
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| CN202011023144.0A CN112145469A (en) | 2020-09-25 | 2020-09-25 | Phase modulator cooling air temperature control method |
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| CN202011023144.0A CN112145469A (en) | 2020-09-25 | 2020-09-25 | Phase modulator cooling air temperature control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487594A (en) * | 2009-02-23 | 2009-07-22 | 东南大学 | Control method for restraining influence of coal mill start/stop to main vapour pressure of boiler |
| CN101923338A (en) * | 2009-06-15 | 2010-12-22 | 上海远动科技有限公司 | Chocolate crystallization production line control method and device thereof |
| CN103353773A (en) * | 2013-07-18 | 2013-10-16 | 北京国电富通科技发展有限责任公司 | Adjusting method of converter valve water cooling system cooling water temperature and system thereof |
| CN107421029A (en) * | 2017-06-22 | 2017-12-01 | 江苏联宏智慧能源股份有限公司 | A kind of end cold balance control method |
| CN110145761A (en) * | 2019-05-21 | 2019-08-20 | 江苏方天电力技术有限公司 | A kind of BFG boiler negative pressure optimal control method |
-
2020
- 2020-09-25 CN CN202011023144.0A patent/CN112145469A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487594A (en) * | 2009-02-23 | 2009-07-22 | 东南大学 | Control method for restraining influence of coal mill start/stop to main vapour pressure of boiler |
| CN101923338A (en) * | 2009-06-15 | 2010-12-22 | 上海远动科技有限公司 | Chocolate crystallization production line control method and device thereof |
| CN103353773A (en) * | 2013-07-18 | 2013-10-16 | 北京国电富通科技发展有限责任公司 | Adjusting method of converter valve water cooling system cooling water temperature and system thereof |
| CN107421029A (en) * | 2017-06-22 | 2017-12-01 | 江苏联宏智慧能源股份有限公司 | A kind of end cold balance control method |
| CN110145761A (en) * | 2019-05-21 | 2019-08-20 | 江苏方天电力技术有限公司 | A kind of BFG boiler negative pressure optimal control method |
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Application publication date: 20201229 |