CN112128602B - Lubricating oil temperature control method for large phase modifier capable of inhibiting intermittent internal disturbance - Google Patents
Lubricating oil temperature control method for large phase modifier capable of inhibiting intermittent internal disturbance Download PDFInfo
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- CN112128602B CN112128602B CN202011023121.XA CN202011023121A CN112128602B CN 112128602 B CN112128602 B CN 112128602B CN 202011023121 A CN202011023121 A CN 202011023121A CN 112128602 B CN112128602 B CN 112128602B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
- F16N39/02—Arrangements for conditioning of lubricants in the lubricating system by cooling
Abstract
A temperature control method for large phase modulator lubricating oil for inhibiting intermittent internal disturbance comprises the following steps: adding a correction quantity delta SP of a cooling fan on/off to a set value SP of the temperature of the lubricating oil to obtain a calculated value A; subtracting the calculated value A from the temperature process value PV of the lubricating oil to obtain a temperature deviation signal delta t; inputting the delta t into the PID controller, calculating the operation output u based on the control parameters, and acting the PID operation output u on the lubricating oil temperature regulating valve. The control method of the invention not only enables the lubricating oil temperature regulating valve to respond to the influence of the internal heat production change of the phase modulator on the lubricating oil temperature, and carry out continuous deviation regulation, but also can quickly respond to the sudden change of the temperature of external cold water caused by the phase change and heat absorption of water vapor greatly due to the starting and stopping of the fan, thereby ensuring that the lubricating oil temperature maintains higher control precision, inhibiting the internal disturbance of the system and improving the operation stability of the phase modulator. And the frequent action of the lubricating oil temperature regulating valve can be reduced, and the service life of the lubricating oil temperature regulating valve is prolonged.
Description
Technical Field
The invention belongs to the technical field of thermotechnical automatic control, relates to a temperature control technology of phase modulator lubricating oil, and particularly relates to a temperature control method of large phase modulator lubricating oil for inhibiting intermittent internal disturbance.
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 the temperature control of the lubricating oil of the phase modifier.
The main functions of the phase modifier lubricating oil system comprise: 1) lubrication: each bearing and the turning gear of the phase modifier; 2) establishing an oil film: a stable oil film is formed in the bearing, and the good rotation of the rotor is maintained; 3) circulating heat exchange: the heat conduction, surface friction and oil vortex of the rotor can generate considerable heat, and a part of oil is needed for heat exchange in order to keep the oil temperature suitable all the time; 4) as other system oil sources: the barring system and the jacking shaft oil system provide stable and reliable oil sources. The lubricating oil in the lubricating oil system maintains its cooling capacity by exchanging heat with external cold water in a heat exchanger. A conventional way of controlling the temperature of the lubricating oil is shown in fig. 1, where a PID controller combines a set value of the temperature of the lubricating oil with an actual measured value thereof to control the opening degree of a lubricating oil temperature regulating valve. The lubricating oil temperature regulating valve is arranged in a flow channel of external cold water, the opening degree of the lubricating oil temperature regulating valve determines the water inlet flow of the external cold water in the heat exchanger, and the temperature of the lubricating oil after heat exchange can be regulated by controlling the opening degree of the lubricating oil temperature regulating valve. And the external cold water is in a mechanical ventilation cooling tower, and the quantity of liquid water phase changed into gaseous water is increased by linking a variable-frequency cooling fan to promote heat absorption, so that the temperature of the external cold water is quickly reduced, the cooling capacity of the external cold water is improved for a short time, and the heat exchange requirement of the phase modifier lubricating oil is further met.
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 is not favorable for the stable control of the temperature of lubricating oil due to the fact that the internal disturbance of the starting and stopping of a fan with high frequency is faced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the temperature control strategy of the lubricating oil of the phase modulator is optimized, and the optimal control method of the temperature of the lubricating oil, which can not only enable the temperature regulating valve of the lubricating oil to respond to the temperature change of the lubricating oil to carry out continuous deviation regulation when the temperature of the external cold water is rapidly changed, but also can rapidly respond to the temperature change of the phase change and heat absorption of the water vapor of the external cold water, thereby ensuring that the temperature of the lubricating oil maintains small fluctuation, stabilizing the temperature of the lubricating oil, inhibiting the internal disturbance of a system and improving the operation stability of the phase modulator, is provided.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:
a method for controlling the lubricating oil temperature of a large phase modulator by inhibiting intermittent internal disturbance is used in the control of a PID controller of a lubricating oil system on a lubricating oil temperature regulating valve, and is characterized by comprising the following steps:
step S1, adding a correction quantity delta SP of starting and stopping a cooling fan to a lubricating oil temperature set value SP to obtain a calculated value A;
step S2, subtracting the calculated value A from a temperature process value PV of the lubricating oil to obtain a temperature deviation signal delta t, wherein the temperature process value PV of the lubricating oil is an actual measured value of the temperature of the lubricating oil;
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 lubricating oil temperature adjusting valve to adjust the temperature of the lubricating oil;
in the above step S1:
the correction quantity delta SP of the starting and stopping of the cooling fan to the lubricating oil temperature set value SP 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 temperature of the lubricating oil when the cooling fan is stopped, and the delta SP-is the correction quantity delta SP-of the set value of the temperature of the lubricating oil when the cooling fan is started;
(△SP+)＝STEP+
(△SP-)＝STEP-
the STEP + is an actual differential module selected for a 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 cooling fan, TCThe differential time when the cooling fan is started is S is a Laplace operator;
Td＝60～80sec，D＝4～6，
TC＝300～400sec，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 Ki is set to a second preset value B2, and the value of the derivative coefficient Kd is set to a third preset value B3.
Further, the first predetermined value B1 of the proportional gain Kp is 0.2-0.3, and the second predetermined value B2 of the integration time Ki is 10-20 s.
Further, the third preset value B3 is 0.
Has the advantages that:
the method for controlling the lubricating oil temperature of the large phase modulator for inhibiting intermittent internal disturbance can not only enable the lubricating oil temperature regulating valve to respond to the influence of the internal heat production change of the phase modulator on the lubricating oil temperature and carry out continuous deviation regulation, but also 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 when the cooling fan of a mechanical ventilation cooling tower is started and stopped in an interlocking manner, thereby ensuring that the lubricating oil temperature maintains higher control precision, inhibiting the internal disturbance of a system and improving the operation stability of the phase modulator. And the frequent action of the lubricating oil temperature regulating valve can be reduced, and the service life of the lubricating oil temperature regulating valve is prolonged.
Drawings
FIG. 1 is a schematic diagram of a conventional manner of controlling the temperature of lubricating oil;
FIG. 2 is a flow chart of a control method of the present invention;
FIG. 3 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.
The method for controlling the lubricating oil temperature of the large phase modulator for inhibiting intermittent internal disturbance is used for controlling the lubricating oil temperature regulating valve by a PID controller of a lubricating oil system, as shown in figures 2 and 3. The heated lubricating oil is subjected to heat exchange with external cold water in a heat exchanger to maintain a proper oil temperature. And the lubricating oil temperature regulating valve is arranged on a water inlet pipeline of the cold water outside the heat exchanger, and controls the water inlet flow of the cold water pipeline outside the heat exchanger through the opening degree so as to realize the regulation of the oil temperature at the outlet of the lubricating oil pipeline of 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 a cooling fan for starting and stopping a lubricating oil temperature set value SP at the outlet of a lubricating oil pipeline of a heat exchanger 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 cooling 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 lubricating oil is restrained.
The correction quantity delta SP of the temperature set value when the cooling fan is started and stopped is as follows:
△SP＝(△SP+)-(△SP-)
wherein, the Delta SP + is the correction quantity Delta SP + of the lubricating oil temperature set value SP when the cooling fan is stopped, 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 cooling fan, TCThe differential time when the cooling fan is started is S is a Laplace operator;
Td＝60～80sec，D＝4～6，
TC＝300～400sec，C＝2～5。
step S2, subtracting the calculated value A from a lubricating oil temperature process value PV to obtain a temperature deviation signal delta t, wherein the lubricating oil temperature process value PV is an actual oil temperature measured value of a heat exchanger lubricating oil pipeline outlet fed back to a PID controller 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 Ki 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 Ki 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 first preset value B1 of the proportional gain Kp is set to 0.2 to 0.3, the second preset value B2 of the integration time Ki is set to 10 to 20s, and the third preset value B3 is set to 0.
Step 4), acting the PID operation output u on a lubricating oil temperature regulating valve to realize the regulation of the temperature of the lubricating oil after heat exchange;
the invention relates to a method for controlling the temperature of lubricating oil of a large phase modulator for inhibiting intermittent internal disturbance, which 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. In the test process, when the temperature of the cold water supply outside the phase modulator reaches 35 ℃, the three cooling fans are delayed for ten seconds to start in a frequency conversion mode, the starting frequency is quickly increased to 30Hz, and the temperature of the cold water outside the phase modulator 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 stopped, the water vapor phase change heat absorption mode is switched to a convection heat exchange mode, when the phase modifier operates in high-temperature weather in summer, 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 the fan with high frequency, so that the stable control of the temperature of lubricating oil is not facilitated. Before the invention is adopted, the temperature of the lubricating oil of the unit fluctuates between (-2) DEG C in most of the operation time, and the convergence cannot be stabilized. After the invention is adopted, the fluctuation energy of the temperature of the lubricating oil can be stably controlled within a range of (-1) DEG C, the accidental internal disturbance generated by the start and stop of the three fans can be effectively inhibited, the control precision of the temperature of the lubricating oil is improved, the action frequency of the temperature regulating valve of the lubricating oil is slowed down, and the service life of the temperature regulating valve of the lubricating oil 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 method for controlling the lubricating oil temperature of a large phase modulator by inhibiting intermittent internal disturbance is used in the control of a PID controller of a lubricating oil system on a lubricating oil temperature regulating valve, and is characterized by comprising the following steps:
step S1, adding a correction quantity delta SP of starting and stopping a cooling fan to a lubricating oil temperature set value SP to obtain a calculated value A;
step S2, subtracting the calculated value A from a temperature process value PV of the lubricating oil to obtain a temperature deviation signal delta t, wherein the temperature process value PV of the lubricating oil is an actual measured value of the temperature of the lubricating oil;
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 lubricating oil temperature adjusting valve to adjust the temperature of the lubricating oil;
in the above step S1:
the correction quantity delta SP of the starting and stopping of the cooling fan to the lubricating oil temperature set value SP is determined by a dynamic feedforward technology based on actual differentiation, and the correction quantity delta SP is as follows:
△SP＝(△SP+)-(△SP-)
wherein, the delta SP + is the correction quantity delta SP + to the lubricating oil temperature set value SP when the cooling fan is stopped, and the delta SP-is the correction quantity delta SP-to the lubricating oil temperature set value SP when the cooling fan is started;
(△SP+)＝STEP+
(△SP-)＝STEP-
the STEP + is an actual differential module selected for a 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 cooling fan, TCThe differential time when the cooling fan is started is S is a Laplace operator;
Td＝60～80sec，D＝4～6，
TC＝300～400sec，C＝2～5。
2. the method for controlling the temperature of the lubricating oil of the large phase modulator for suppressing the intermittent internal disturbance as claimed in claim 1, wherein:
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 the integral time Ki as a second preset value B2 and the value of a differential coefficient Kd as a third preset value B3.
3. The method for controlling the temperature of the lubricating oil of the large phase modulator for suppressing the intermittent internal disturbance as claimed in claim 2, wherein:
the first predetermined value B1 of the proportional gain Kp is 0.2-0.3, and the second predetermined value B2 of the integration time Ki is 10-20 s.
4. A large phase modulator lubricating oil temperature control method with suppressed intermittent internal disturbance according to claim 2 or 3, characterized in that:
the third preset value B3 has a value of 0.
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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 |
| CN102393631A (en) * | 2011-10-17 | 2012-03-28 | 北京中冶设备研究设计总院有限公司 | Lubricating oil temperature control system based on fuzzy control |
| CN103712235A (en) * | 2013-12-26 | 2014-04-09 | 广东电网公司电力科学研究院 | Primary air fan controlling method and device |
| CN108039738A (en) * | 2018-01-16 | 2018-05-15 | 云南电网有限责任公司电力科学研究院 | A kind of hydroelectric generating set load control method |
| CN110043801A (en) * | 2019-03-07 | 2019-07-23 | 青岛科技大学 | A kind of crude oil heater and its control system |
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2020
- 2020-09-25 CN CN202011023121.XA patent/CN112128602B/en active Active
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 |
| CN102393631A (en) * | 2011-10-17 | 2012-03-28 | 北京中冶设备研究设计总院有限公司 | Lubricating oil temperature control system based on fuzzy control |
| CN103712235A (en) * | 2013-12-26 | 2014-04-09 | 广东电网公司电力科学研究院 | Primary air fan controlling method and device |
| CN108039738A (en) * | 2018-01-16 | 2018-05-15 | 云南电网有限责任公司电力科学研究院 | A kind of hydroelectric generating set load control method |
| CN110043801A (en) * | 2019-03-07 | 2019-07-23 | 青岛科技大学 | A kind of crude oil heater and its control system |
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