CN112731796A - Control method for inhibiting influence of start-stop cooling fan on cooling water temperature of stator of camera - Google Patents
Control method for inhibiting influence of start-stop cooling fan on cooling water temperature of stator of camera Download PDFInfo
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- CN112731796A CN112731796A CN202011023122.4A CN202011023122A CN112731796A CN 112731796 A CN112731796 A CN 112731796A CN 202011023122 A CN202011023122 A CN 202011023122A CN 112731796 A CN112731796 A CN 112731796A
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- 239000000498 cooling water Substances 0.000 title claims abstract description 80
- 238000001816 cooling Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000012937 correction Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims description 18
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- 238000012546 transfer Methods 0.000 claims description 4
- 230000000452 restraining effect Effects 0.000 claims description 2
- 239000003607 modifier Substances 0.000 abstract description 10
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- 239000012071 phase Substances 0.000 description 23
- 238000010521 absorption reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000012808 vapor phase Substances 0.000 description 3
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- 230000003111 delayed effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000005399 mechanical ventilation Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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Abstract
The invention discloses a control method for inhibiting the influence of a start-stop cooling fan on the cooling water temperature of a stator of a camera, which comprises the following steps of: adding a correction quantity delta SP of a starting and stopping cooling fan to a set value SP of the stator cooling water temperature to obtain a calculated value A; subtracting the calculated value A from the stator cooling water process value PV to obtain a temperature deviation signal delta t; and the PID operation output quantity u acts on a stator cooling water temperature regulating valve to regulate the inlet water temperature of the stator coil cooling water. The control method can ensure that the temperature of the stator cooling water maintains higher control precision, inhibit the internal disturbance of the system, improve the running stability of the phase modifier, reduce the frequent action of the desuperheating water regulating valve and prolong the service life of the temperature regulating valve.
Description
Technical Field
The invention belongs to the technical field of thermal automatic control, and particularly relates to a control method for inhibiting the influence of starting and stopping a cooling fan on the temperature of cooling water of a stator of a camera.
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 of the automatic control of the stator cooling system of the double-water internal cooling phase modifier.
The main functions of the phase modifier stator cooling water system are as follows: and continuously supplying water to the coil, so that the stator coil is cooled, and the temperature of the stator coil is maintained within an allowable range. The working principle of the stator cooling water system of the phase modifier is roughly as follows: stator cooling water gets into stator coil to take away heat cooling coil, the high temperature cooling water that comes out from stator coil carries out the heat transfer cooling with outer cold water medium in the heat exchanger, in order to maintain its cooling capacity, and the cooling water after the cooling gets back to stator coil again through the pipeline, constitutes endless cooling system.
The phase modifier is additionally installed on a converter station or a transformer substation. For the external cold water, the converter station has low water consumption, and generally adopts tap water as a cooling medium. However, the evaporation area of the external cold water buffer pool is small, and the natural evaporation cooling mode can meet the cooling requirement only by matching 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 heat exchange requirement of the phase modulator.
The phase modifier stator cooling system is provided with an automatic water temperature regulator, and a core component is composed of a temperature regulating valve which regulates the water inlet flow of external cold water in a heat exchanger through opening degree so as to realize the regulation of the water outlet temperature of a stator cooling water port of the heat exchanger or the water inlet temperature of a stator coil and keep the stator cooling water port basically stable. The water inlet temperature of the cooling water in the stator coil is 45 ℃, the temperature fluctuation range is not more than +/-3 ℃, the water outlet temperature is not more than 80 ℃, the traditional control mode is as shown in figure 1, and the PID controller controls the temperature regulating valve according to a water inlet temperature measured value and a stator cooling water inlet temperature given value fed back by the temperature transmitter so as to realize the regulation of the water inlet temperature of the cooling water of the stator coil.
However, in the conventional control method, frequent start of the cooling fan is a sporadic internal disturbance, which causes fluctuation of the temperature of the external cooling water, and further causes fluctuation of the temperature of the cooling water of the stator. 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 water adjustment valve (as shown in fig. 2). The above-described oscillation is unstable from the viewpoint of automatic quality, increases the probability of occurrence of a failure of the regulator valve, and also has an adverse effect on the phase modulator stator coil life.
Disclosure of Invention
The technical purpose of the invention is as follows: a stator cooling water temperature optimization control method for a phase modulator is provided, which can not only enable a stator cooling water temperature adjusting valve to control and respond to the change of stator cooling water to carry out continuous deviation adjustment, but also can quickly respond to the temperature change of phase change and heat absorption of the vapor of the external cooling water when the temperature of the external cooling water changes rapidly, thereby ensuring that the temperature of the stator cooling water maintains small fluctuation, stabilizing the temperature of the stator cooling water, effectively inhibiting the internal disturbance of a system and improving the operation stability of the phase modulator.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:
a control method for restraining the influence of starting and stopping a cooling fan on the cooling water temperature of a stator of a camera is used in the control of a PID (proportion integration differentiation) controller of a stator cooling system on a cooling water temperature regulating valve of the stator, and is characterized by comprising the following steps of:
step S1, adding the correction quantity delta SP of the set value of the start and stop cooling fan to the set value SP of the cooling water temperature of the stator to obtain a calculated value A;
step S2, subtracting the calculated value A from a stator cooling water process value PV to obtain a temperature deviation signal delta t, wherein the stator cooling water process value PV is an actual measured value of the stator cooling temperature;
step S3, inputting delta t into the PID controller, and calculating the PID operation output u by the PID controller based on the preset control parameter;
step S4, the PID operation output u is acted on a stator cooling water temperature regulating valve to regulate the inlet water temperature of the stator cooling water;
in the above step S1:
the correction quantity delta SP of the set value of the cooling water temperature of the stator 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 water temperature of the stator by the air stopping machine, and the delta SP-is the correction quantity delta SP-of the set value of the cooling water temperature of the stator 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＝50～70sec，D＝4～6；
TC＝250～350sec，C＝2～5。
on the basis of the above scheme, a further improved or preferred scheme further comprises:
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 0.1-0.2, and the preset value B2 of the integration time Ti is 20-30 s.
Further, the third preset value B3 is 0.
Has the advantages that:
the control method can not only make the temperature reduction water regulating valve respond to the heat production change inside the phase modifier and continuously regulate the temperature of the stator cooling water when the cooling fan of the mechanical ventilation cooling tower is started and stopped in an interlocking way, but also can quickly respond to the sudden change of the temperature of the external cooling water caused by the great vapor phase change and heat absorption due to the starting and stopping of the fan, ensure that the temperature of the stator cooling water maintains higher control precision, inhibit the internal disturbance of the system, improve the operation stability of the phase modifier, reduce the frequent actions of the temperature reduction water regulating valve and prolong the service life of the temperature regulating valve.
Drawings
FIG. 1 is a schematic diagram of a conventional stator cooling water temperature single-loop control scheme;
FIG. 2 is a schematic diagram of stator cooling water 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.
As shown in fig. 3 and 4, the control method for suppressing the influence of starting and stopping the cooling fan on the cooling water temperature of the stator of the camera is used in the control of the PID controller of the stator cooling water system on the cooling water temperature adjusting valve of the stator, the cooling water temperature adjusting valve of the stator is installed on the water pipe of the external cooling water of the heat exchanger, and the adjustment of the cooling water inlet temperature of the stator coil is realized by adjusting the inlet flow of the external cooling water in the heat exchanger.
The specific process of the control method of the embodiment comprises the following steps:
step S1, adding a correction quantity Delta SP of the stator cooling water temperature set value by starting and stopping a cooling fan to the stator cooling water temperature set value SP 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 the cooling water of the stator 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, DeltaSP + is the correction quantity DeltaSP + of the set value of the cooling water temperature of the stator by the air stopping machine, and DeltaSP-is the correction quantity DeltaSP-
(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＝50～70sec，D＝4～6
TC＝250～350sec，C＝2～5。
step S2, subtracting the calculated value A from a stator cooling water process value PV to obtain a temperature deviation signal delta t, wherein the stator cooling water process value PV is a stator cooling water inlet temperature measured value fed back by a temperature transmitter in real time;
step S3, 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 present embodiment, the default value B1 of the proportional gain Kp is preferably set to 0.1-0.2, and the default value B2 of the integration time Ti is preferably set to 20-30 s. The value of the third preset value B3 is set to 0.
Step 4) acting the PID operation output u on a stator cooling water temperature regulating valve to realize the regulation of the inlet water temperature of the stator cooling water;
the control method for inhibiting the influence of the start-stop cooling fan on the cooling water temperature of the stator of the camera can be directly realized in various Distributed Control Systems (DCS) in a configuration mode.
The control method of the embodiment is successfully applied to a 300MVar phase modulator set which is constructed in a matching way in a converter station. When the temperature of the water supply of the external cold water of the phase modulator reaches 35 ℃, the three cooling fans are delayed for ten seconds to start in a variable frequency mode, the starting frequency is quickly increased to 30Hz, and the temperature of the external cold water is quickly reduced by absorbing a large amount of heat in a water-vapor phase change mode. 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, the control method can inhibit the influence of starting and stopping the cooling fan on the temperature of cooling water of the stator of the phase modifier, and the temperature of the cooling water of the stator is stably controlled in a safe range.
Before the method is adopted, the temperature of the stator cooling water of the unit fluctuates between (-3) DEG C in most running time, and the stator cooling water cannot be calmly converged. After the invention is adopted, the fluctuation energy of the temperature of the cooling water of the stator 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 temperature of the cooling water of the stator is improved, the action frequency of the temperature-reducing water regulating valve is slowed down, and the service life of the temperature 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 control method for restraining the influence of starting and stopping a cooling fan on the cooling water temperature of a stator of a camera is used in the control of a PID (proportion integration differentiation) controller of a stator cooling system on a cooling water temperature regulating valve of the stator, and is characterized by comprising the following steps of:
step S1, adding the correction quantity delta SP of the set value of the start and stop cooling fan to the set value SP of the cooling water temperature of the stator to obtain a calculated value A;
step S2, subtracting the calculated value A from a stator cooling water process value PV to obtain a temperature deviation signal delta t, wherein the stator cooling water process value PV is an actual measured value of the stator cooling temperature;
step S3, inputting delta t into the PID controller, and calculating the PID operation output u by the PID controller based on the preset control parameter;
step S4, the PID operation output quantity u is acted on a stator cooling water temperature regulating valve to regulate the inlet water temperature of the stator coil cooling water;
in the above step S1:
the correction quantity delta SP of the set value of the cooling water temperature of the stator 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 water temperature of the stator by the air stopping machine, and the delta SP-is the correction quantity delta SP-of the set value of the cooling water temperature of the stator 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＝50～70sec，D＝4～6；
TC＝250～350sec，C＝2～5。
2. the control method for inhibiting the influence of the start-stop cooling fan on the cooling water temperature of the stator of the camera according to claim 1, is 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 control method for inhibiting the influence of the start-stop cooling fan on the cooling water temperature of the stator of the camera according to claim 2, is characterized in that:
the default value B1 of the proportional gain Kp is 0.1-0.2, and the default value B2 of the integral time Ti is 20-30 s.
4. The control method for inhibiting the influence of the start-stop cooling fan on the cooling water temperature of the camera stator according to claim 2 or 3, is characterized in that:
the third preset value B3 has a value of 0.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011023122.4A CN112731796A (en) | 2020-09-25 | 2020-09-25 | Control method for inhibiting influence of start-stop cooling fan on cooling water temperature of stator of camera |
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| CN202011023122.4A CN112731796A (en) | 2020-09-25 | 2020-09-25 | Control method for inhibiting influence of start-stop cooling fan on cooling water temperature of stator of camera |
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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 CN202011023122.4A patent/CN112731796A/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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