CN109240195A - Oil immersed type converter transformer cooling system control method and control system - Google Patents
Oil immersed type converter transformer cooling system control method and control system Download PDFInfo
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- CN109240195A CN109240195A CN201811221038.6A CN201811221038A CN109240195A CN 109240195 A CN109240195 A CN 109240195A CN 201811221038 A CN201811221038 A CN 201811221038A CN 109240195 A CN109240195 A CN 109240195A
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- cooling fan
- cooler
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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
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/054—Input/output
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/11—Plc I-O input output
- G05B2219/1105—I-O
Abstract
The present invention discloses a kind of oil immersed type converter transformer cooling system control method and control system.The present invention determines the need for starting cooler according to top-oil temperature or current loads, and when needing to start cooler, the revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are further determined according to harmonic content.It can be seen that, harmonic content size when the present invention is run according to converter power transformer determines the starting quantity of cooler, and the speed of service based on harmonic content real-time control oil circulating pump and cooling fan, the larger situation of the hot(test)-spot temperature distributional difference of converter power transformer when harmonic components are serious is fully considered, reliable and effective control is realized to the temperature rise of converter power transformer, it can guarantee the safe and stable operation of converter power transformer, there is good on-site test effect and engineering practical value.
Description
Technical field
The present invention relates to field of cooling, more particularly to a kind of oil immersed type converter transformer cooling system control method
And control system.
Background technique
With the development of China's DC transmission system, Transmission level is also higher and higher, super-pressure and the extra-high voltage direct-current change of current
The demand of transformer is also continuously increased, and it is particularly important to guarantee that it safely and steadily runs.Converter power transformer is as direct current transportation
Core power equipment in engineering, there is the critical function AC rectification, DC inverter.Converter power transformer is in operation
Along with more high-frequency harmonic, this has great test to performances such as the electric heating of converter power transformer.When harmonic wave is serious, it can lead
The dielectric loss of converter power transformer is caused to increase, the leakage field of harmonic wave can be such that the stray loss of converter power transformer increases, simultaneously because humorous
Heating problem caused by the kelvin effect of wave lower conductor will lead to and produce in the iron core, winding and hardware of converter power transformer
Raw more serious added losses and local problems of excessive heat, cause the insulation ageing problem as caused by thermal fault, in some instances it may even be possible to straight
Connecing causes converter station accident to cause large-area power-cuts, causes heavy loss.
Conventional Large Oil immersion converter power transformer generallys use the air-cooled type of cooling of forced oil-circulation at present, when the change of current becomes
When depressor temperature rises, by data such as the top-oil temperature of acquisition converter power transformer and actual loads, converter power transformer wind is controlled
The switching of fan and oil pump, and then play the role of cooling down to converter power transformer.But the harmonic wave as present in converter power transformer
The hot(test)-spot temperature distributional difference that will lead to converter power transformer is larger, and therefore, the existing air-cooled type of cooling of forced oil-circulation can not
Guarantee the safe and stable operation of converter power transformer.
Summary of the invention
The object of the present invention is to provide a kind of oil immersed type converter transformer cooling system control method and control systems, sufficiently
Consider harmonic components it is serious when converter power transformer the larger situation of hot(test)-spot temperature distributional difference, the temperature rise to converter power transformer
Reliable and effective control is realized, can guarantee the safe and stable operation of converter power transformer, there is good on-site test effect
With engineering practical value.
To achieve the above object, the present invention provides following schemes:
A kind of control method of the cooling system of oil immersed type converter power transformer, the cooling system includes multiple groups cooler,
Cooler described in every group includes oil circulating pump, connect with the oil circulating pump oil circulating pump motor, cooling fan and with it is described
The cooling fan motor of cooling fan connection, the control method include:
Obtain the top-oil temperature of converter power transformer and the current loads of the converter power transformer；
Starting cooler is determined the need for according to the top-oil temperature or the current loads, obtains the first judgement knot
Fruit；
When first judging result expression needs to start cooler, the harmonic content of the converter power transformer is obtained；
The revolving speed and cooling fan motor of the oil circulating pump motor of the cooler of starting are determined according to the harmonic content
Revolving speed.
Optionally, described to determine the need for starting cooler according to the top-oil temperature or the current loads, it obtains
First judging result, specifically includes:
Obtain the rated load of the converter power transformer and the top-oil temperature threshold value of converter power transformer；
Judge whether to meet cooler entry condition, obtains the first judging result, the cooler entry condition are as follows: described
Current loads are more than or equal to 0.7 times of rated load or the top-oil temperature is more than or equal to the top-oil temperature threshold
Value.
Optionally, the revolving speed of the oil circulating pump motor of the cooler that starting is determined according to the harmonic content and cooling
The revolving speed of fan motor, specifically includes:
Harmonic content section is obtained, the harmonic content section includes: first harmonic section, second harmonic section, third
Harmonic range and the 4th harmonic range；
Determine the harmonic content section where the harmonic content；
When the harmonic content section where the harmonic content is first harmonic section, start one group of cooler, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is second harmonic section, start two groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is third harmonic section, start three groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is four harmonic range, start four groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content.
Optionally, the first harmonic section be (0,10%), the second harmonic section be [10%, 15%), it is described
Third harmonic section be [15%, 20%), the 4th harmonic range be [20%, 50%).
Optionally, it is described according to the harmonic content determine starting the cooler oil circulating pump motor revolving speed and
The revolving speed of cooling fan motor, specifically includes:
Judge whether the harmonic content is less than harmonic data thresholds, obtains the second judging result；
When second judging result indicates that the harmonic content is more than or equal to harmonic data thresholds, it is determined that recycle oil
The revolving speed of pump motor is the maximum (top) speed of oil circulating pump motor, and the revolving speed of cooling fan motor is the maximum of cooling fan motor
Revolving speed；
When second judging result indicates that the harmonic content is less than harmonic data thresholds,
According to formula:Determine the frequency of oil circulating pump motor, wherein f1Indicate oil circulating pump electricity
The frequency of machine, HRU indicate harmonic content, HRUmaxIndicate harmonic data thresholds, fmax1Indicate that the maximum (top) speed of oil circulating pump motor is corresponding
Frequency；
According to formula:Determine the frequency of cooling fan motor, wherein f2Indicate cooling fan electricity
The frequency of machine, fmax2Indicate the corresponding frequency of maximum (top) speed of cooling fan motor；
According to formula:Determine the revolving speed of oil circulating pump motor, wherein n1Indicate oil circulating pump motor
Revolving speed, p1Indicate the number of pole-pairs of oil circulating pump motor；s1Indicate the revolutional slip of oil circulating pump motor；
According to formula:Determine the revolving speed of cooling fan motor, wherein n2Indicate cooling fan electricity
The revolving speed of machine, p2Indicate the number of pole-pairs of cooling fan motor；s2Indicate the revolutional slip of cooling fan motor.
A kind of control system of the cooling system of oil immersed type converter power transformer, the cooling system includes multiple groups cooler,
Cooler described in every group includes oil circulating pump, connect with the oil circulating pump oil circulating pump motor, cooling fan and with it is described
The cooling fan motor of cooling fan connection, the control system include:
Oil temperature and Load obtaining module, for obtain converter power transformer top-oil temperature and the converter power transformer it is current
Load；
First judgment module, for determining the need for starting cooling according to the top-oil temperature or the current loads
Device obtains the first judging result；
Harmonic content obtains module, for when first judging result expression needs to start cooler, described in acquisition
The harmonic content of converter power transformer；
Motor speed determining module, the oil circulating pump motor of the cooler for determining starting according to the harmonic content
The revolving speed of revolving speed and cooling fan motor.
Optionally, the first judgment module includes:
Rated load and oil temperature threshold value acquiring unit, for obtaining the rated load and change of current transformation of the converter power transformer
The top-oil temperature threshold value of device；
First judging unit meets cooler entry condition for judging whether, obtains the first judging result, the cooling
Device entry condition are as follows: the current loads are more than or equal to 0.7 times of rated load or the top-oil temperature is greater than or waits
In the top-oil temperature threshold value.
Optionally, the motor speed determining module includes:
Harmonic range acquiring unit, for obtaining harmonic content section, the harmonic content section includes: first harmonic area
Between, second harmonic section, third harmonic section and the 4th harmonic range；
Harmonic content interval determination unit, for determining the harmonic content section where the harmonic content；
Cooler start unit, is used for
When the harmonic content section where the harmonic content is first harmonic section, start one group of cooler, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is second harmonic section, start two groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is third harmonic section, start three groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is four harmonic range, start four groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content.
A kind of cooling system of oil immersed type converter power transformer, the cooling system include: temperature sensor, frequency-converter power biography
Sensor, A/D conversion module, controller, variable-frequency governor, cooling fan motor, cooling fan, oil circulating pump motor and recycle oil
Pump, wherein
The temperature sensor and the variable-frequency power sensor are connect with converter power transformer, the A/D conversion module
Connect respectively with the variable-frequency power sensor and the temperature sensor, the controller respectively with the A/D conversion module
It is connected with the variable-frequency governor, the variable-frequency governor connects with the cooling fan motor and the oil circulating pump motor respectively
It connects, the cooling fan is connect with the cooling fan motor, and the oil circulating pump is connect with the oil circulating pump motor, described
Controller is used to control the cooling fan motor movement according to the control method and the cooling fan is driven to rotate, and controls
It makes the oil circulating pump motor movement and drives the oil circulating pump movement.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
Oil immersed type converter transformer cooling system control method and control system provided by the invention, according to top-oil temperature and
Current loads determine the need for starting cooler, when needing to start cooler, are further determined and are started according to harmonic content
Cooler oil circulating pump motor revolving speed and cooling fan motor revolving speed.As it can be seen that the present invention is transported according to converter power transformer
Harmonic content size when row determines the starting quantity of cooler, and is based on harmonic content real-time control oil circulating pump and cooling
The speed of service of fan has fully considered the biggish feelings of hot(test)-spot temperature distributional difference of converter power transformer when harmonic components are serious
Condition realizes reliable and effective control to the temperature rise of converter power transformer, can guarantee the safe and stable operation of converter power transformer, tool
There are good on-site test effect and engineering practical value.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of process of the control method of the cooling system of oil immersed type converter power transformer provided in an embodiment of the present invention
Figure；
Fig. 2 is a kind of structure of the control system of the cooling system of oil immersed type converter power transformer provided in an embodiment of the present invention
Block diagram；
Fig. 3 is a kind of structural block diagram of the cooling system of oil immersed type converter power transformer provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of oil immersed type converter transformer cooling system control method and control systems, sufficiently
Consider harmonic components it is serious when converter power transformer the larger situation of hot(test)-spot temperature distributional difference, the temperature rise to converter power transformer
Reliable and effective control is realized, can guarantee the safe and stable operation of converter power transformer, there is good on-site test effect
With engineering practical value.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 is a kind of process of the control method of the cooling system of oil immersed type converter power transformer provided in an embodiment of the present invention
Figure.As shown in Figure 1, a kind of control method of the cooling system of oil immersed type converter power transformer, the cooling system includes that multiple groups are cold
But device, cooler described in every group includes oil circulating pump, the oil circulating pump motor that is connect with the oil circulating pump, cooling fan and with
The cooling fan motor of the cooling fan connection, the control method include:
Step 101: obtaining the top-oil temperature of converter power transformer and the current loads of the converter power transformer.
Step 102: determining the need for starting cooler according to the top-oil temperature or the current loads, obtain first
Judging result.
Step 103: when first judging result expression needs to start cooler, obtaining the humorous of the converter power transformer
Wave content.
Step 104: the revolving speed and cooling wind of the oil circulating pump motor of the cooler of starting are determined according to the harmonic content
Fan the revolving speed of motor.
Specifically, step 102: starting cooler is determined the need for according to the top-oil temperature or the current loads,
The first judging result is obtained, is specifically included:
Obtain the rated load of the converter power transformer and the top-oil temperature threshold value of converter power transformer；
Judge whether to meet cooler entry condition, obtains the first judging result, the cooler entry condition are as follows: described
Current loads are more than or equal to 0.7 times of rated load or the top-oil temperature is more than or equal to the top-oil temperature threshold
Value.The range of the top-oil temperature threshold value is [50 DEG C, 60 DEG C], it is preferable that top-oil temperature threshold value is 55 DEG C.
Specifically, step 104: according to the harmonic content determine starting cooler oil circulating pump motor revolving speed and
The revolving speed of cooling fan motor, specifically includes:
Harmonic content section is obtained, the harmonic content section includes: first harmonic section, second harmonic section, third
Harmonic range and the 4th harmonic range.In the present embodiment, the first harmonic section is (0,10%), the second harmonic section
For [10%, 15%), the third harmonic section be [15%, 20%), the 4th harmonic range be [20%, 50%)；
Determine the harmonic content section where the harmonic content；
When the harmonic content section where the harmonic content is first harmonic section, start one group of cooler, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is second harmonic section, start two groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is third harmonic section, start three groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is four harmonic range, start four groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content.
Further, the revolving speed of the oil circulating pump motor of the cooler that starting is determined according to the harmonic content
With the revolving speed of cooling fan motor, specifically include:
Judge whether the harmonic content is less than harmonic data thresholds, obtains the second judging result.Optionally, the model of harmonic data thresholds
Enclosing is 20%~30%, and harmonic data thresholds are 20% in the present embodiment；
When second judging result indicates that the harmonic content is more than or equal to harmonic data thresholds, it is determined that recycle oil
The revolving speed of pump motor is the maximum (top) speed of oil circulating pump motor, and the revolving speed of cooling fan motor is the maximum of cooling fan motor
Revolving speed；
When second judging result indicates that the harmonic content is less than harmonic data thresholds,
According to formula:Determine the frequency of oil circulating pump motor, wherein f1Indicate oil circulating pump electricity
The frequency of machine, HRU indicate harmonic content, HRUmaxIndicate harmonic data thresholds, fmax1Indicate that the maximum (top) speed of oil circulating pump motor is corresponding
Frequency；
According to formula:Determine the frequency of cooling fan motor, wherein f2Indicate cooling fan electricity
The frequency of machine, fmax2Indicate the corresponding frequency of maximum (top) speed of cooling fan motor；
According to formula:Determine the revolving speed of oil circulating pump motor, wherein n1Indicate oil circulating pump motor
Revolving speed, p1Indicate the number of pole-pairs of oil circulating pump motor；s1Indicate the revolutional slip of oil circulating pump motor；
According to formula:Determine the revolving speed of cooling fan motor, wherein n2Indicate cooling fan electricity
The revolving speed of machine, p2Indicate the number of pole-pairs of cooling fan motor；s2Indicate the revolutional slip of cooling fan motor.
Fig. 2 is a kind of structure of the control system of the cooling system of oil immersed type converter power transformer provided in an embodiment of the present invention
Block diagram.As shown in Fig. 2, a kind of control system of the cooling system of oil immersed type converter power transformer, the cooling system includes multiple groups
Cooler, cooler described in every group includes oil circulating pump, the oil circulating pump motor that is connect with the oil circulating pump, cooling fan and
The cooling fan motor connecting with the cooling fan, the control system include:
Oil temperature and Load obtaining module 201, for obtaining the top-oil temperature and the converter power transformer of converter power transformer
Current loads；
First judgment module 202, it is cold for determining the need for starting according to the top-oil temperature or the current loads
But device obtains the first judging result；
Harmonic content obtains module 203, for obtaining institute when first judging result expression needs to start cooler
State the harmonic content of converter power transformer；
Motor speed determining module 204, the oil circulating pump electricity of the cooler for determining starting according to the harmonic content
The revolving speed of machine and the revolving speed of cooling fan motor.
Specifically, the first judgment module 202 includes:
Rated load and oil temperature threshold value acquiring unit, for obtaining the rated load and change of current transformation of the converter power transformer
The top-oil temperature threshold value of device；
First judging unit meets cooler entry condition for judging whether, obtains the first judging result, the cooling
Device entry condition are as follows: the current loads are more than or equal to 0.7 times of rated load or the top-oil temperature is greater than or waits
In the top-oil temperature threshold value.
Specifically, the motor speed determining module 204 includes:
Harmonic range acquiring unit, for obtaining harmonic content section, the harmonic content section includes: first harmonic area
Between, second harmonic section, third harmonic section and the 4th harmonic range；
Harmonic content interval determination unit, for determining the harmonic content section where the harmonic content；
Cooler start unit, is used for
When the harmonic content section where the harmonic content is first harmonic section, start one group of cooler, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is second harmonic section, start two groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is third harmonic section, start three groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content；
When the harmonic content section where the harmonic content is four harmonic range, start four groups of coolers, and root
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content.
Fig. 3 is a kind of structural block diagram of the cooling system of oil immersed type converter power transformer provided in an embodiment of the present invention.Such as Fig. 3
Shown, a kind of cooling system of oil immersed type converter power transformer, the cooling system includes: temperature sensor 300, frequency-converter power biography
Sensor 301, controller 303, variable-frequency governor 304, cooling fan motor 305, cooling fan 306, follows at A/D conversion module 302
Ring Oil pump electrical machinery 307 and oil circulating pump 308.In the present embodiment, controller 303 is PLC controller.
The temperature sensor 300 and the variable-frequency power sensor 301 are connect with converter power transformer, and the A/D turns
Mold changing block 302 is connect with the variable-frequency power sensor 301 and the temperature sensor 300 respectively, and the controller 303 is distinguished
Connect with the A/D conversion module 302 and the variable-frequency governor 304, the variable-frequency governor 304 respectively with the cooling wind
Motor 305 and the oil circulating pump motor 307 connection are fanned, the cooling fan 306 is connect with the cooling fan motor 305,
The oil circulating pump 308 is connect with the oil circulating pump motor 307, and the controller 303 is used for according to the control method
Controlling the cooling fan motor 305 drives the cooling fan 306 to rotate, and controls the oil circulating pump motor 307 and drive
The oil circulating pump 308 moves.
As it can be seen that the cooling system includes three parts: first part is by structures such as cooler ontology, oil stream pipeline and valves
At oil piping system, second part is the air flow system being made of fan blade, motor and ventilating duct etc., Part III be by
The circuit system that A.C. contactor, relay, temperature sensor, connecting terminal and electric wire etc. are formed by connecting.Circuit system control
Oil piping system and air flow system rationally effectively control converter power transformer running temperature with realizing, to guarantee converter power transformer
Temperature it is uniform.Specifically, temperature sensor 300 is used to acquire the top-oil temperature and converter power transformer of the converter power transformer
Operating ambient temperature, the variable-frequency power sensor 301 are used to acquire each harmonic content in converter power transformer, the A/D
The analog signals of sensor are transformed into digital quantity signal and pass to controller 303 by conversion module 302, and the controller 303 is logical
Control variable-frequency governor 304 is crossed to control the movement of cooling fan motor 305 of converter transformer cooling system and drive the cooling
Fan 306 rotates, and the movement of control loop Oil pump electrical machinery 307 drives the oil circulating pump 308 to move.
In the present embodiment, each harmonic content size of converter power transformer is obtained using variable-frequency power sensor 301,
Then sampled value is passed through electricity by carrying out AC sampling to the current signal in converter power transformer by variable-frequency power sensor 301
The Transmission systems such as cable or optical fiber and digital quantity input secondary meter are connected, A/D conversion module 302 by the sampled value to electric current into
Row operation, the parameters such as available fundamental current and harmonic current, variable-frequency power sensor 301 can be used for appointing in bandwidth range
The measurement of meaning electric parameter.When the capacity of oil immersed type converter power transformer is more than 180000kVA or voltage is 220kV or more, adopt
With forced oil-circulated air-cooled, but mode cools down to transformer.Variable-frequency power sensor 301 is sensed using SP series frequency-converter power
Broadband character under the broadband character of device, especially high voltage can be used for the field that frequency converter output etc. is rich in higher hamonic wave
The frequency analysis of conjunction or power quality analysis.The A/D conversion module 302 is adopted variable-frequency power sensor by certain circuit
The analog signals of collection are transformed into digital quantity signal and are transmitted to controller 303, in order to using control frequency conversion tune after sequential operation
Fast device.
The controller 303 is the control centre of cooling system, and the signal acquired by sensor is to converter power transformer
Cooling fan and the power output of oil circulating pump are rationally controlled.The variable-frequency governor 304 by change alternating current frequency from
And realize the control to asynchronous motor speed.The oil circulating pump of the converter power transformer uses middling speed pump, and 4 pole motors turn
The nearly 1500r/min of quick access.The cooling fan of the converter power transformer installs ventilating duct, mesh enclosure and related supporting device additional, selects
High wind speed, the fan of high total head pressure are mating.
In the present embodiment, the converter transformer cooling system includes 5 groups of coolers, and every group has 1 oil circulating pump and 3
Cooling fan.When the harmonic content of real-time detection is in (0,10%) section, 1 group of cooler is enabled, includes 1 oil pump and 3
Desk fan.When real-time detection harmonic content [10%, 15%) in section when, enable 2 groups of coolers, include 2 oil pumps and 6
Desk fan.When real-time detection harmonic content [15%, 20%) in section when, enable 3 groups of coolers, include 3 oil pumps and 9
Desk fan.When real-time detection harmonic content [20%, 50%) in section when, enable 4 groups of coolers, comprising 4 oil pumps and
12 desk fans.For the various running conditions for meeting converter power transformer, 1 spare cooler is in addition added, when operation cooler event
Operation can be automatically engaged when barrier.Every converter power transformer amounts to 15 desk fans, is controlled using grouping-hierarchy, cooler automatic switching
Follow " first throw first move back, recycle spare " principle.
Such as there are each harmonic components such as not in certain 500kV converter power transformer, through measuring fundametal compoment and each harmonic
The ratio substantially 1:0.172:0.105:0.039:0.021:0.012:0.0098 of component (secondary), wherein when harmonic component is big
When 23 times or more, fundamental wave ratio shared by harmonic component can ignore 23 times and the above harmonic wave less than 0.01,
The ratio of total harmonic component substantially 27.5%.
Section is the 4th harmonic range where converter power transformer harmonic content, and harmonic content seriously leads to change of current transformation
Device loss is high, and fever is serious, therefore cooling system enables 4 groups of coolers, includes 4 oil circulating pumps and 12 cooling fans, with
Guarantee that converter power transformer temperature is uniform, avoids hot-spot problem.
Meanwhile the harmonic content size of converter power transformer that is obtained according to variable-frequency power sensor 301 of PLC controller is to becoming
Frequency governor 304 issues instruction, carries out variable frequency regulating speed control to converter power transformer cooling fan and oil circulating pump power output size.This
In embodiment, the asynchronous motor of cooling fan is 4 pole motors that revolving speed is 1450r/min, is not more than for impeller diameter
The blower of 400mm；The oil circulating pump of the converter power transformer uses middling speed pump, and 4 pole motors, revolving speed is close to 1500r/min.
Harmonic content size when the present invention is run according to converter power transformer determines converter power transformer cooling fan and follows
The enabling group number and power output size of ring oil pump, have fully considered the hot(test)-spot temperature distribution of converter power transformer when harmonic components are serious
The case where differing greatly realizes reliable and effective control to the temperature rise of converter power transformer, can guarantee the peace of converter power transformer
Full stable operation has good on-site test effect and engineering practical value.
Claims (9)
1. a kind of control method of the cooling system of oil immersed type converter power transformer, which is characterized in that the cooling system includes more
Group cooler, cooler described in every group includes oil circulating pump, the oil circulating pump motor that connect with the oil circulating pump, cooling fan
And the cooling fan motor connecting with the cooling fan, the control method include:
Obtain the top-oil temperature of converter power transformer and the current loads of the converter power transformer；
Starting cooler is determined the need for according to the top-oil temperature or the current loads, obtains the first judging result；
When first judging result expression needs to start cooler, the harmonic content of the converter power transformer is obtained；
The revolving speed of the oil circulating pump motor of the cooler of starting and the revolving speed of cooling fan motor are determined according to the harmonic content.
2. control method according to claim 1, which is characterized in that described according to the top-oil temperature or described current negative
Lotus determines the need for starting cooler, obtains the first judging result, specifically includes:
Obtain the rated load of the converter power transformer and the top-oil temperature threshold value of converter power transformer；
Judge whether to meet cooler entry condition, obtain the first judging result, the cooler entry condition are as follows: is described current
Load is more than or equal to 0.7 times of rated load or the top-oil temperature is more than or equal to the top-oil temperature threshold value.
3. control method according to claim 1, which is characterized in that described to determine the cold of starting according to the harmonic content
But the revolving speed of the revolving speed of the oil circulating pump motor of device and cooling fan motor, specifically includes:
Harmonic content section is obtained, the harmonic content section includes: first harmonic section, second harmonic section, third harmonic
Section and the 4th harmonic range；
Determine the harmonic content section where the harmonic content；
When the harmonic content section where the harmonic content is first harmonic section, start one group of cooler, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor；
When the harmonic content section where the harmonic content is second harmonic section, start two groups of coolers, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor；
When the harmonic content section where the harmonic content is third harmonic section, start three groups of coolers, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor；
When the harmonic content section where the harmonic content is four harmonic range, start four groups of coolers, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor.
4. control method according to claim 3, which is characterized in that the first harmonic section is (0,10%), described
Second harmonic section be [10%, 15%), the third harmonic section be [15%, 20%), the 4th harmonic range is
[20%, 50%).
5. control method according to claim 3, which is characterized in that the institute for determining starting according to the harmonic content
The revolving speed of the oil circulating pump motor of cooler and the revolving speed of cooling fan motor are stated, is specifically included:
Judge whether the harmonic content is less than harmonic data thresholds, obtains the second judging result；
When second judging result indicates that the harmonic content is more than or equal to harmonic data thresholds, it is determined that oil circulating pump electricity
The revolving speed of machine is the maximum (top) speed of oil circulating pump motor, and the revolving speed of cooling fan motor is the maximum turn of cooling fan motor
Speed；
When second judging result indicates that the harmonic content is less than harmonic data thresholds,
According to formula:Determine the frequency of oil circulating pump motor, wherein f1Indicate oil circulating pump motor
Frequency, HRU indicate harmonic content, HRUmaxIndicate harmonic data thresholds, fmax1Indicate the corresponding frequency of maximum (top) speed of oil circulating pump motor
Rate；
According to formula:Determine the frequency of cooling fan motor, wherein f2Indicate cooling fan motor
Frequency, fmax2Indicate the corresponding frequency of maximum (top) speed of cooling fan motor；
According to formula:Determine the revolving speed of oil circulating pump motor, wherein n1Indicate turning for oil circulating pump motor
Speed, p1Indicate the number of pole-pairs of oil circulating pump motor；s1Indicate the revolutional slip of oil circulating pump motor；
According to formula:Determine the revolving speed of cooling fan motor, wherein n2Indicate turning for cooling fan motor
Speed, p2Indicate the number of pole-pairs of cooling fan motor；s2Indicate the revolutional slip of cooling fan motor.
6. a kind of control system of the cooling system of oil immersed type converter power transformer, which is characterized in that the cooling system includes more
Group cooler, cooler described in every group includes oil circulating pump, the oil circulating pump motor that connect with the oil circulating pump, cooling fan
And the cooling fan motor connecting with the cooling fan, the control system include:
Oil temperature and Load obtaining module, top-oil temperature and the current of the converter power transformer for obtaining converter power transformer are born
Lotus；
First judgment module is obtained for determining the need for starting cooler according to the top-oil temperature or the current loads
Obtain the first judging result；
Harmonic content obtains module, for obtaining the change of current when first judging result expression needs to start cooler
The harmonic content of transformer；
Motor speed determining module, the revolving speed of the oil circulating pump motor of the cooler for determining starting according to the harmonic content
With the revolving speed of cooling fan motor.
7. control system according to claim 6, which is characterized in that the first judgment module includes:
Rated load and oil temperature threshold value acquiring unit, for obtaining the rated load and converter power transformer of the converter power transformer
Top-oil temperature threshold value；
First judging unit meets cooler entry condition for judging whether, obtains the first judging result, the cooler opens
Dynamic condition are as follows: the current loads are more than or equal to 0.7 times of rated load or the top-oil temperature is more than or equal to institute
State top-oil temperature threshold value.
8. control system according to claim 6, which is characterized in that the motor speed determining module includes:
Harmonic range acquiring unit, for obtaining harmonic content section, the harmonic content section include: first harmonic section,
Second harmonic section, third harmonic section and the 4th harmonic range；
Harmonic content interval determination unit, for determining the harmonic content section where the harmonic content；
Cooler start unit, is used for
When the harmonic content section where the harmonic content is first harmonic section, start one group of cooler, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor；
When the harmonic content section where the harmonic content is second harmonic section, start two groups of coolers, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor；
When the harmonic content section where the harmonic content is third harmonic section, start three groups of coolers, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor；
When the harmonic content section where the harmonic content is four harmonic range, start four groups of coolers, and according to institute
State the revolving speed of the oil circulating pump motor of the cooler of the determining starting of harmonic content and the revolving speed of cooling fan motor.
9. a kind of cooling system of oil immersed type converter power transformer, the cooling system includes: temperature sensor, frequency-converter power sensing
Device, A/D conversion module, controller, variable-frequency governor, cooling fan motor, cooling fan, oil circulating pump motor and recycle oil
Pump, wherein
The temperature sensor and the variable-frequency power sensor are connect with converter power transformer, the A/D conversion module difference
Connect with the variable-frequency power sensor and the temperature sensor, the controller respectively with the A/D conversion module and institute
Variable-frequency governor connection is stated, the variable-frequency governor is connect with the cooling fan motor and the oil circulating pump motor respectively,
The cooling fan is connect with the cooling fan motor, and the oil circulating pump is connect with the oil circulating pump motor, the control
Device processed drives described cold for the control method according to claim 1-5 control cooling fan motor movement
But fan rotates, and controls the oil circulating pump motor movement and drive the oil circulating pump movement.
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| CN111722657A (en) * | 2019-03-18 | 2020-09-29 | 宁波奥克斯高科技有限公司 | Transformer temperature control method and transformer |
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| CN109240195B (en) | 2021-06-01 |
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