CN112130452A - Control method for preventing rotor cooling water temperature of double-water internal cooling phase modifier from being excessively adjusted - Google Patents
Control method for preventing rotor cooling water temperature of double-water internal cooling phase modifier from being excessively adjusted Download PDFInfo
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- CN112130452A CN112130452A CN202011021284.4A CN202011021284A CN112130452A CN 112130452 A CN112130452 A CN 112130452A CN 202011021284 A CN202011021284 A CN 202011021284A CN 112130452 A CN112130452 A CN 112130452A
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- 239000000498 cooling water Substances 0.000 title claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000001816 cooling Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003607 modifier Substances 0.000 title abstract description 10
- 238000012937 correction Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims description 14
- 230000004069 differentiation Effects 0.000 claims description 4
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- 238000012546 transfer Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 239000012071 phase Substances 0.000 description 24
- 239000012808 vapor phase Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005399 mechanical ventilation Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012544 monitoring process Methods 0.000 description 1
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- 230000010355 oscillation Effects 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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- 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
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
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- G—PHYSICS
- 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
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Abstract
The invention discloses a control method for preventing the excessive regulation of the temperature of cooling water of a rotor of a double-water internal cooling phase modulator, which is used for controlling the temperature regulation of the cooling water of the rotor by a PID controller and comprises the following steps: adding the correction quantity delta SP of the set value of the start and stop cooling fan to the temperature set value SP of the rotor cooling water to obtain a calculated value A; subtracting the calculated value A from the rotor cooling water process value PV to obtain a temperature deviation signal delta t; inputting the delta t into a PID controller, and calculating an operation output u based on a preset control parameter; the output u is applied to the rotor cooling water temperature adjusting valve. The control method can ensure that the temperature of the cooling water of the rotor maintains higher control precision, inhibit internal disturbance of the system, improve the running stability of the phase modifier, reduce frequent actions of the desuperheating water regulating valve and prolong the service life of the desuperheating water regulating valve.
Description
Technical Field
The invention relates to a control method for the temperature of cooling water of a rotor of a double-water internal cooling phase modifier, in particular to a control method capable of preventing the temperature of the cooling water of the rotor of the double-water internal cooling phase modifier from being excessively adjusted in the process of starting and stopping a cooling fan, belonging to the technical field of automatic control of thermal engineering.
Background
In recent years, extra-high voltage transmission systems have caused changes in grid characteristics. Due to the slow response speed of conventional power and electronic equipment, the system cannot be quickly provided with enough reactive support during the 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 cooling process of the double-water internal cooling phase modifier.
Two rows of coils are arranged in a rotor groove of a rotor cooling water system of the double-water internal cooling phase modulator, each row of coils is a water channel, after cooling water flows into the rotor coils, water enters the inner bottom coils of the groove, and water exits from the top coils. The flow of the waterway is generally as follows: the cooling water from the heat exchanger enters a central tube hole on a water inlet support at a wire outlet end, then enters a water inlet tank through two radial tubes, then enters a stainless steel corner through an insulating water conduit and flows into a rotor coil, after the rotor coil is cooled, enters an insulating water outlet pipe through a water outlet corner, flows into a water outlet tank and then enters the heat exchanger, and exchanges heat with external cold water of an external rotor water system to maintain the refrigerating capacity of the heat exchanger, so that the waterway circulation of the whole rotor coil is completed.
The external rotor water system is provided with a mechanical ventilation cooling tower, and the external cold water medium is promoted to perform water vapor phase change heat absorption and cooling through a variable-frequency cooling fan.
The conventional control mode of the rotor cooling water system of the double-water internal cooling phase modulator is shown in figure 2, and a PID controller controls the opening degree of a rotor cooling water temperature regulating valve according to the inlet water temperature set value of rotor cooling water and a monitoring signal fed back by a temperature transmitter in real time. The rotor cooling water temperature regulating valve is installed on a water inlet pipeline of the external cold water of the heat exchanger, and the outlet water temperature of the heat exchanger or the inlet water temperature of the rotor cooling water is regulated by regulating the inlet water flow of the external cold water.
For the conventional control mode, frequent starting of a cooling fan in the cooling tower is a sporadic internal disturbance, and the disturbance can cause fluctuation of the temperature of external cold water, so that fluctuation of the temperature of rotor cooling water is caused. Particularly, in high-temperature weather in summer, the frequency of occurrence of the disturbance is increased, and the opening command of the rotor cooling water temperature regulating valve is continuously and greatly oscillated. The above-mentioned oscillations are unstable from an automatic quality point of view, increase the probability of failure of the regulating valve and also have an adverse effect on the life of the rotor coil of the phase modulator.
Disclosure of Invention
The invention aims to optimize a phase modulator rotor cooling water temperature control strategy and provides a rotor cooling water temperature optimization control method for improving the running stability of a phase modulator.
In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:
a control method for preventing the excessive regulation of the temperature of the cooling water of a rotor of a double-water internal cooling phase modulator is used in the control of a PID controller on the temperature regulation valve of the cooling water of the rotor, and is characterized by comprising the following steps:
step 1) adding a correction quantity delta SP of a temperature set value SP of rotor cooling water by starting and stopping a cooling fan to the temperature set value SP of the rotor cooling water to obtain a calculated value A;
step 2) subtracting the calculated value A from a rotor cooling water process value PV to obtain a temperature deviation signal delta t, wherein the rotor cooling water process value PV is an actual measured value of the rotor cooling water inlet temperature;
step 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;
step 4) acting the PID operation output u on a rotor cooling water temperature regulating valve to regulate the inlet water temperature of rotor cooling water;
in the step 1) above:
the correction quantity delta SP of the set value of the cooling water temperature of the rotor 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-)
wherein, DeltaSP + is the correction quantity DeltaSP + of the set value of the cooling water temperature of the rotor by the air stopping machine, and DeltaSP-is the correction quantity DeltaSP-
(△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＝60sec，D＝5
TC＝300sec，C＝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 integral 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 internal heat production change of the phase modifier and carry out continuous deviation regulation on the temperature of the rotor cooling water when the cooling fan of the mechanical ventilation cooling tower is interlocked and started and stopped, but also can quickly respond to the sudden change of the temperature of the external cooling water caused by the great vapor phase change heat absorption due to the starting and stopping of the fan, ensure that the temperature of the rotor 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 reduction water regulating valve.
Drawings
FIG. 1 is a schematic view of a partial structure of a rotor cooling water system of a double-water internal cooling phase modulator;
FIG. 2 shows a conventional control method of a rotor cooling water system of a double-water internal cooling phase modulator;
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.
The control method for preventing the rotor cooling water temperature of the double-water internal cooling phase modulator from being excessively adjusted is used for controlling the opening degree of a rotor cooling water temperature adjusting valve by a PID (proportion integration differentiation) controller, wherein the rotor cooling water temperature adjusting valve is installed on a water pipeline of external cold water of a heat exchanger and is used for adjusting the flow of the external cold water in the heat exchanger.
The specific process of the control method of the embodiment comprises the following steps:
step 1) adding a correction quantity delta SP of a set value SP of the cooling water temperature of a rotor (the cooling water temperature of a water inlet side of a rotor coil) to the set value SP of the cooling water temperature of the rotor 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 water of the rotor is restrained.
The correction amount Δ SP is:
△SP＝(△SP+)-(△SP-)
wherein, DeltaSP + is the correction quantity DeltaSP + of the set value of the cooling water temperature of the rotor 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 fan is stopped;
STEP-is the actual differential module selected for the STEP change from 0 to C when starting the fan;
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＝60sec，D＝5
TC＝300sec，C＝5。
step 2) subtracting the calculated value A from a rotor cooling water process value PV to obtain a temperature deviation signal delta t, wherein the rotor cooling water process value PV is a rotor cooling water inlet temperature measured value fed back by a temperature transmitter in real time;
step 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 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 rotor cooling water temperature regulating valve to regulate the inlet water temperature of the rotor cooling water;
the control method for preventing the excessive adjustment of the temperature of the cooling water of the rotor of the double-water internal cooling phase modulator 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 rotor of the phase modifier, and the temperature of the cooling water of the rotor is stably controlled in a safe range.
Before the invention is adopted, the temperature of the rotor cooling water of the unit fluctuates between (-3) DEG C in most running time, and the convergence cannot be stabilized. After the invention is adopted, the fluctuation energy of the temperature of the cooling water of the rotor is stably controlled within 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 rotor is improved, the action frequency of the temperature-reducing water regulating valve is slowed down, and the service life of the temperature-reducing water 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 preventing the excessive regulation of the temperature of the cooling water of a rotor of a double-water internal cooling phase modulator is used in the control of a PID controller on the temperature regulation valve of the cooling water of the rotor, and is characterized by comprising the following steps:
step 1) adding a correction quantity delta SP of a temperature set value SP of rotor cooling water by starting and stopping a cooling fan to the temperature set value SP of the rotor cooling water to obtain a calculated value A;
step 2) subtracting the calculated value A from a rotor cooling water process value PV to obtain a temperature deviation signal delta t, wherein the rotor cooling water process value PV is an actual measured value of the rotor cooling water inlet temperature;
step 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;
step 4) acting the PID operation output u on a rotor cooling water temperature regulating valve to regulate the inlet water temperature of rotor cooling water;
in the step 1) above:
the correction quantity delta SP of the set value of the cooling water temperature of the rotor 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 rotor 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 rotor 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＝60sec，D＝5
TC＝300sec，C＝5。
2. the control method for preventing the excessive adjustment of the temperature of the cooling water of the rotor of the double-water internal cooling phase modulator 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 preventing the excessive adjustment of the temperature of the cooling water of the rotor of the double-water internal cooling phase modulator as claimed in 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 preventing the excessive adjustment of the temperature of the cooling water of the rotor of the double-water internal cooling phase modulator according to the claim 2 or 3, 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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| CN202011021284.4A CN112130452A (en) | 2020-09-25 | 2020-09-25 | Control method for preventing rotor cooling water temperature of double-water internal cooling phase modifier from being excessively adjusted |
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| CN202011021284.4A CN112130452A (en) | 2020-09-25 | 2020-09-25 | Control method for preventing rotor cooling water temperature of double-water internal cooling phase modifier from being excessively adjusted |
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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 CN202011021284.4A patent/CN112130452A/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: 20201225 |