CN104865992A - Direct-current cooling system of main transformer of transformer substation - Google Patents
Direct-current cooling system of main transformer of transformer substation Download PDFInfo
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- CN104865992A CN104865992A CN201510135301.XA CN201510135301A CN104865992A CN 104865992 A CN104865992 A CN 104865992A CN 201510135301 A CN201510135301 A CN 201510135301A CN 104865992 A CN104865992 A CN 104865992A
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Abstract
The invention provides a direct-current cooling system of a main transformer of a transformer substation. The direct-current cooling system comprises a power supply device, an automatic control device, and a drive unit, wherein the automatic control device and the drive unit are connected with the power supply device. The power supply device consists of a rectification voltage-stabilization unit and a storage battery connected with the rectification voltage-stabilization unit. The automatic control device includes a signal collection device and a processor. The drive unit includes a frequency-variable controller and cooler. When the transformer is in a valley load mode, the rectification system is switched to charge the storage battery; and in a peak load mode, switching to the storage battery is realized for power supply and cooling. The drive unit is capable of adjusting the operating way of the cooler according to the load demand. According to the invention, problems of single operation state and high energy consumption of the traditional main transformer cooling system can be solved; the cooling efficiency can be improved effectively; the power peak-valley difference can be balanced; and the energy consumption can be reduced. The power consumption of the transformer can be reduced in a peak load mode and the service life is prolonged; and the system is safe and reliable.
Description
Technical field
The present invention relates to transformer Cooling technical field, particularly relate to a kind of main transformer of transformer substation once-through cooling system.
Background technology
Transforming plant main transformer, refers generally to the forced-oil-air cooling transformer that transformer station is main.The heat radiation of forced-oil-air cooling transformer, after by force upper pyrometer oil can only being caused refrigeratory heat radiation by oil pump, reinject transformer bottom, thus, reach transformer normal full load under summer high temperature or big current situation and run.Therefore, the condition that forced-oil-air cooling transformer normally works is exactly---and refrigeratory must put into operation.
The cooling system of tradition main-transformer is interchange 380 volts of continued powers, but because the electric power peak-valley difference of the every day operation of transformer is larger, peak hours, transformer own power loss ratio is more serious, the power consumption of cooling system just can have influence on the normal operation of transformer, and when load underestimated by transformer, high-power refrigeratory can consume again too much vacant load, the requirement of energy-saving and noise-reducing can not be reached, thus need a kind of can according to the cooling system of transformer load demand free adjustment running status.
Summary of the invention
Technical matters to be solved by this invention is just to provide a kind of main transformer of transformer substation once-through cooling system, solve the problems such as traditional transformer cooling system running status is single, energy consumption is high, not only effectively improve cooling effectiveness, energy consumption can also be saved, increase the service life, safe and reliable.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of main transformer of transformer substation once-through cooling system, comprises supply device and difference connected automaton, drive unit; Described supply device is made up of rectification stable pressuring unit and the accumulator that connects thereof; Described automaton comprises signal picker and processor, and described drive unit comprises frequency-variable controller and refrigeratory.
Described rectification stable pressuring unit comprises DC rectifier and mu balanced circuit, described DC rectifier connects power amplifier, described power amplifier envelope OTL amplifying circuit, described mu balanced circuit comprises H-bridge inverter circuit, output filter and series resonant circuit, adopts shielded signal line to be connected between described mu balanced circuit with described accumulator.
Described signal picker comprises voltage sensor, current sensor and Temperature Humidity Sensor, and described processor comprises control chip group and data-carrier store, and described signal picker is connected with described control chip group.
Described control chip group comprises singlechip chip and its analog to digital conversion circuit connected.
Described frequency-variable controller comprises PWM waveform generator and regulating circuit, and described regulating circuit is pressure-decreasing type translation circuit.
Described refrigeratory comprises direct current generator and powerful fan, and described direct current generator connects described frequency-variable controller.
Described supply device and described automaton are packaged in insulation box respectively, and described insulation box material is the stainless steel materials of 0.9mm to 1.1mm, described sheet material comprise multiple miniature polyhedron louvre.
Once-through cooling system of the present invention, mainly by the automatic control and regulation of system running state, reach the object of raising the efficiency, saving energy consumption, mainly through two approach, one is the introducing of alternating current-direct current energy conversion and accumulator, realize the memory of the energy, two is that signals collecting processes with judgement, and system running state is changed.
The supply device of system is packaged in insulation box, casing is the corrosion resistant plate product of surface coverage insullac, surface comprises multiple miniature polyhedron louvre, both well ventilative radiating effect can have been played, and apply the principle of electromagnetic shield-ing of metallic cage body, than traditional wooden partition inner liner metal net, better shield effectiveness can be played; Supply device is made up of rectification stable pressuring unit and the accumulator that connects thereof; Rectification stable pressuring unit comprises DC rectifier, frequency controller and mu balanced circuit; Supply device connects industrial frequency AC 220V and industrial frequency AC 380V two-way input power, widely applicable, according to the difference of input source, introduce the different input ports of DC rectifier, the rectification being convenient to AC-DC conversion exports, and DC rectifier connects power amplifier, AC signal carries out modulating by the inverter circuit in rectifier, process after, due to impedance operator, if directly introduce subordinate's circuit, often produce because signal is small and weak and attenuate.For this reason, need to utilize prior art small-signal to be carried out power amplification and ensure that whole transfer process is carried out smoothly.According to actual conditions, the technology of power amplifier mainly realizes following aspect function: have enough large output power, ensures output signal normal transmission in circuit; Require the rated load impedance of power amplifier and the impedance matching of inverter circuit; Because load variations is larger, require that power amplifier has strong carrying load ability, so that power amplifier working stability, dependable performance; So power amplifier comprises OTL circuit.
Adopt shielded signal line to be connected between mu balanced circuit with accumulator, stablizing when being mainly convenient to discharge and recharge is controlled.Charge and discharge control is designed, along with the development of power electronic devices, high-power switch device as the technology of insulated gate bipolar transistor IGBT and manufacturing process increasingly mature, the application of having succeeded in transducer, Active Power Filter-APF, rectifier, inverter, Dynamic Voltage Regulator etc.In this programme, adopt the circuit be made up of IGBT to produce high-power sinusoidal signal, this signal is after step-up transformer boosting and high-pressure series resonant circuit are amplified, and electric pressure can reach high pressure, UHV (ultra-high voltage), extra-high voltage rank.Establish the mathematical model of frequency modulation type resonance extra-high voltage experiment power supply, and propose the method for voltage-regulation self-adjusting Bi Li – integral control method and the phase-locked automatic frequency adjustment of a kind of new PI on this basis, thus realize pressure regulation and the frequency modulation of whole charge and discharge device, the control method that we carry is conducive to eliminating the steady-state error of sensing device and improving the dynamic property of sensing device, be easy to Project Realization, mu balanced circuit is primarily of H-bridge inverter circuit, output filter, series resonant circuit forms, coordinate the uncontrollable rectification circuit of three-phase of upper level, realize complete rectification and discharge and recharge operation.
The automaton of system is also packaged in insulation box, comprise signal picker and processor, signal picker comprises voltage sensor, current sensor and Temperature Humidity Sensor, processor comprises control chip group and data-carrier store, signal picker is connected with control chip group, and control chip group comprises singlechip chip and its analog to digital conversion circuit connected, voltage sensor and current sensor gather the associated voltage current signal of main-transformer, and by signal input processor after analog to digital conversion, processor is by the power calculation encapsulation subroutine in control chip called data storer, calculate real-time power now, and in control chip, compare with the daily load changed power table stored in storer, when transformer low ebb load, time such as after midnight, be switched to by processor control supply device and charge a battery, storage battery power supply cooling is switched at peak hours, electric power peak-valley difference can be stabilized, peak hours reduces the consumption of transformer own power, can how for load, when accumulator electric-quantity is finished, supply device can be controlled and provide electric power directly to direct current generator, do not affect transformer normally to run.Temperature Humidity Sensor mainly gathers ambient temperature and humidity residing for cooling system and transformer body temperature, when temperature is too high, just can skip the decision process of power load, makes the full speed running of cooling drive unit, ensures that the heat radiation of transformer is preferential.
Drive unit comprises frequency-variable controller and refrigeratory, and frequency-variable controller comprises PWM waveshape monitor and regulating circuit, and regulating circuit is pressure-decreasing type translation circuit, and refrigeratory comprises direct current generator and powerful fan, and direct current generator connects frequency-variable controller.Consider from the angle of energy-saving and noise-reducing, after automaton judges current transformer state, thus the operational mode selecting cooling system different, by switching the charge and discharge mode of battery pack on the one hand, on the other hand, be exactly by switching the operational mode of drive unit, namely when main-transformer is under load judgment model, compared by current loads and daily load changed power table, draw driver output parameter, the rotary regimes of fan is constantly regulated again through regulating circuit and frequency-variable controller, reach and both ensure that system is normally run, the object of efficient energy-saving can be realized again, so just can from the angle of driving condition, introduce the concept of power state adjustment, realize intelligentized control method, the life-span of effective extension device and heating radiator, and save energy consumption.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described:
Fig. 1 is structure principle chart of the present invention.
Fig. 2 is the power amplifier circuit figure of rectification stable pressuring unit.
Fig. 3 is the mu balanced circuit figure of rectification stable pressuring unit.
Fig. 4 is frequency-variable controller regulating circuit figure.
Embodiment
As shown in Figure 1, Figure 2, Figure 3, Figure 4, a kind of main transformer of transformer substation once-through cooling system, comprises supply device and difference connected automaton, drive unit; Supply device is made up of rectification stable pressuring unit 1 and the accumulator 2 that connects thereof; Automaton comprises signal picker 3 and processor, and drive unit comprises frequency-variable controller 4 and refrigeratory 5.
Rectification stable pressuring unit comprises DC rectifier 6 and mu balanced circuit 7, DC rectifier connects power amplifier 8, power amplifier envelope OTL amplifying circuit, mu balanced circuit comprises H-bridge inverter circuit, output filter and series resonant circuit, adopts shielded signal line to be connected between mu balanced circuit with accumulator.
Signal picker comprises voltage sensor 9, current sensor 10 and Temperature Humidity Sensor 11, and processor comprises control chip group 12 and data-carrier store 13, and signal picker is connected with control chip group.
Control chip group comprises singlechip chip and its analog to digital conversion circuit connected.
Frequency-variable controller comprises PWM waveform generator 14 and regulating circuit 15, and regulating circuit is pressure-decreasing type translation circuit.
Refrigeratory comprises direct current generator 16 and powerful fan 17, and direct current generator connects frequency-variable controller.
Supply device and automaton are packaged in insulation box respectively, and insulation box material is the stainless steel materials of 0.9mm to 1.1mm, sheet material comprise multiple miniature polyhedron louvre.
Once-through cooling system of the present invention, mainly by the automatic control and regulation of system running state, reach the object of raising the efficiency, saving energy consumption, mainly through two approach, one is the introducing of alternating current-direct current energy conversion and accumulator, realize the memory of the energy, two is that signals collecting processes with judgement, and system running state is changed.
The supply device of system is packaged in insulation box, casing is the corrosion resistant plate product of surface coverage insullac, surface comprises multiple miniature polyhedron louvre, both well ventilative radiating effect can have been played, and apply the principle of electromagnetic shield-ing of metallic cage body, than traditional wooden partition inner liner metal net, better shield effectiveness can be played; Supply device is made up of rectification stable pressuring unit and the accumulator that connects thereof; Rectification stable pressuring unit comprises DC rectifier, frequency controller and mu balanced circuit; Supply device connects industrial frequency AC 220V and industrial frequency AC 380V two-way input power, widely applicable, according to the difference of input source, introduce the different input ports of DC rectifier, the rectification being convenient to AC-DC conversion exports, and DC rectifier connects power amplifier, AC signal carries out modulating by the inverter circuit in rectifier, process after, due to impedance operator, if directly introduce subordinate's circuit, often produce because signal is small and weak and attenuate.For this reason, need to utilize prior art small-signal to be carried out power amplification and ensure that whole transfer process is carried out smoothly.According to actual conditions, the technology of power amplifier mainly realizes following aspect function: have enough large output power, ensures output signal normal transmission in circuit; Require the rated load impedance of power amplifier and the impedance matching of inverter circuit; Because load variations is larger, require that power amplifier has strong carrying load ability, so that power amplifier working stability, dependable performance; So power amplifier comprises OTL circuit, as described in Figure 2, in the circuit, front end is voltage amplifier, and OTL circuit is inputted by front end, is exported by rear end.
Adopt shielded signal line to be connected between mu balanced circuit with accumulator, stablizing when being mainly convenient to discharge and recharge is controlled.Charge and discharge control is designed, along with the development of power electronic devices, high-power switch device as the technology of insulated gate bipolar transistor IGBT and manufacturing process increasingly mature, the application of having succeeded in transducer, Active Power Filter-APF, rectifier, inverter, Dynamic Voltage Regulator etc.In this programme, adopt the circuit be made up of IGBT to produce high-power sinusoidal signal, this signal is after step-up transformer boosting and high-pressure series resonant circuit are amplified, and electric pressure can reach high pressure, UHV (ultra-high voltage), extra-high voltage rank.Establish the mathematical model of frequency modulation type resonance extra-high voltage experiment power supply, and propose the method for voltage-regulation self-adjusting Bi Li – integral control method and the phase-locked automatic frequency adjustment of a kind of new PI on this basis, thus realize pressure regulation and the frequency modulation of whole charge and discharge device, the control method that we carry is conducive to eliminating the steady-state error of sensing device and improving the dynamic property of sensing device, be easy to Project Realization, during concrete enforcement, as shown in Figure 3, mu balanced circuit is primarily of H-bridge inverter circuit, output filter, series resonant circuit forms, coordinate the uncontrollable rectification circuit of three-phase of upper level, realize complete rectification and discharge and recharge operation.
The automaton of system is also packaged in insulation box, comprise signal picker and processor, signal picker comprises voltage sensor, current sensor and Temperature Humidity Sensor, processor comprises control chip group and data-carrier store, signal picker is connected with control chip group, and control chip group comprises singlechip chip and its analog to digital conversion circuit connected, voltage sensor and current sensor gather the associated voltage current signal of main-transformer, and by signal input processor after analog to digital conversion, processor is by the power calculation encapsulation subroutine in control chip called data storer, calculate real-time power now, and in control chip, compare with the daily load changed power table stored in storer, when transformer low ebb load, time such as after midnight, be switched to by processor control supply device and charge a battery, storage battery power supply cooling is switched at peak hours, electric power peak-valley difference can be stabilized, peak hours reduces the consumption of transformer own power, can how for load, when accumulator electric-quantity is finished, supply device can be controlled and provide electric power directly to direct current generator, do not affect transformer normally to run.Temperature Humidity Sensor mainly gathers ambient temperature and humidity residing for cooling system and transformer body temperature, when temperature is too high, just can skip the decision process of power load, makes the full speed running of cooling drive unit, ensures that the heat radiation of transformer is preferential.
Drive unit comprises frequency-variable controller and refrigeratory, and frequency-variable controller comprises PWM waveshape monitor and regulating circuit, and regulating circuit is pressure-decreasing type translation circuit, and refrigeratory comprises direct current generator and powerful fan, and direct current generator connects frequency-variable controller.Consider from the angle of energy-saving and noise-reducing, after automaton judges current transformer state, thus the operational mode selecting cooling system different, by switching the charge and discharge mode of battery pack on the one hand, on the other hand, be exactly by switching the operational mode of drive unit, namely when main-transformer is under load judgment model, compared by current loads and daily load changed power table, draw driver output parameter, the rotary regimes of fan is constantly regulated again through regulating circuit and frequency-variable controller, reach and both ensure that system is normally run, the object of efficient energy-saving can be realized again.
The carrying out practically state of drive unit is embodied in, the warm and humid angle value sampled by prime and the power load values through calculating, determine under different conditions, refrigeratory can regulate according to basic status parameter, state parameter comprises temperature parameter and power parameter, after system cloud gray model, when meeting or exceeding the critical conditions temperature T0 in data-carrier store as detected temperatures T, application of temperature operational mode, now program can skip built-in power decision algorithm, make fan full speed running, to reach the effect of quick heat radiating cooling.When institute detected temperatures T does not reach critical conditions T0, i.e. applied power pattern.
By the current power value D collected, be sent to main control chip, module is according to the relevant system parameters detected, in conjunction with the main transformer rated power information D0 of data memory built-in, calculate power weightings value D ', i.e. D '=D/D0, and then calculate the digital control amount k of rotation speed of the fan, digital control amount k is calculated according to power weightings value by algorithm, i.e. k=k1*D '=k1*D/D0, and wherein k1 is an adjustable constant; Drive frequency-variable controller can send PWM waveform according to above-mentioned digital control amount, for the driving of hardware regulating circuit, change output voltage by regulating circuit, thus regulate rotation speed of the fan.
Fan driving unit regulating circuit schematic diagram, it is the BUCK Buck conversion circuit of a standard, as shown in Figure 4, driving voltage is added in DC fan after circuit conversion, to control the rotating speed of fan, wherein output voltage u is by given output voltage u0 and digital control amount k Comprehensive Control, so just from the angle of driving condition, the concept of power state adjustment can be introduced, realizes intelligentized control method, the life-span of effective extension device and heating radiator, and save energy consumption.
Claims (7)
1. a main transformer of transformer substation once-through cooling system, is characterized in that: comprise supply device and difference connected automaton, drive unit; Described supply device is made up of rectification stable pressuring unit and the accumulator that connects thereof; Described automaton comprises signal picker and processor, and described drive unit comprises frequency-variable controller and refrigeratory.
2. main transformer of transformer substation once-through cooling system as claimed in claim 1, it is characterized in that: described rectification stable pressuring unit comprises DC rectifier and mu balanced circuit, described DC rectifier connects power amplifier, described power amplifier envelope OTL amplifying circuit, described mu balanced circuit comprises H-bridge inverter circuit, output filter and series resonant circuit, adopts shielded signal line to be connected between described mu balanced circuit with described accumulator.
3. main transformer of transformer substation once-through cooling system as claimed in claim 1, it is characterized in that: described signal picker comprises voltage sensor, current sensor and Temperature Humidity Sensor, described processor comprises control chip group and data-carrier store, and described signal picker is connected with described control chip group.
4. main transformer of transformer substation once-through cooling system as claimed in claim 3, is characterized in that: described control chip group comprises singlechip chip and its analog to digital conversion circuit connected.
5. main transformer of transformer substation once-through cooling system as claimed in claim 1, it is characterized in that: described frequency-variable controller comprises PWM waveform generator and regulating circuit, described regulating circuit is pressure-decreasing type translation circuit.
6. main transformer of transformer substation once-through cooling system as claimed in claim 1, it is characterized in that: described refrigeratory comprises direct current generator and powerful fan, described direct current generator connects described frequency-variable controller.
7. main transformer of transformer substation once-through cooling system as claimed in claim 1, it is characterized in that: described supply device and described automaton are packaged in insulation box respectively, described insulation box material is the stainless steel materials of 0.9mm to 1.1mm, described sheet material comprises multiple miniature polyhedron louvre.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202018607U (en) * | 2011-04-11 | 2011-10-26 | 高爱祥 | Temperature intelligent monitoring system for digital transformer |
| CN102891531A (en) * | 2011-07-20 | 2013-01-23 | 上海海能信息科技有限公司 | Transformer load intelligent management system |
| CN102999059A (en) * | 2012-10-11 | 2013-03-27 | 苏州爱知电机有限公司 | GPRS-based (general packet radio service) transformer oil temperature monitoring system |
| CN203433387U (en) * | 2013-08-07 | 2014-02-12 | 云南玉溪中汇电力设备有限责任公司 | Piping and instrument diagram (PID)-based frequency-conversion and speed-regulation cooling control system |
| CN104390662A (en) * | 2014-11-21 | 2015-03-04 | 国家电网公司 | Induction power utilization technology based power transmission equipment comprehensive state monitoring system |
-
2015
- 2015-03-26 CN CN201510135301.XA patent/CN104865992B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202018607U (en) * | 2011-04-11 | 2011-10-26 | 高爱祥 | Temperature intelligent monitoring system for digital transformer |
| CN102891531A (en) * | 2011-07-20 | 2013-01-23 | 上海海能信息科技有限公司 | Transformer load intelligent management system |
| CN102999059A (en) * | 2012-10-11 | 2013-03-27 | 苏州爱知电机有限公司 | GPRS-based (general packet radio service) transformer oil temperature monitoring system |
| CN203433387U (en) * | 2013-08-07 | 2014-02-12 | 云南玉溪中汇电力设备有限责任公司 | Piping and instrument diagram (PID)-based frequency-conversion and speed-regulation cooling control system |
| CN104390662A (en) * | 2014-11-21 | 2015-03-04 | 国家电网公司 | Induction power utilization technology based power transmission equipment comprehensive state monitoring system |
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Inventor after: Wu Zhenyu Inventor after: Hu Juntai Inventor after: Zhou Zhifeng Inventor after: Guo Yipeng Inventor after: Fu Xiao Inventor after: Hu Songjie Inventor after: Niu Yugan Inventor before: Niu Yugan |
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Effective date of registration: 20170512 Address after: 100000 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Pingdingshan Power Supply Company, State Grid Henan Electric Power Co., Ltd. Address before: Pingdingshan City, Henan Province, the southern section of Xinhua Road 467001 Applicant before: Pingdingshan Power Supply Company, State Grid Henan Electric Power Co., Ltd. |
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