CN203632348U - High-voltage end energy supply system - Google Patents
High-voltage end energy supply system Download PDFInfo
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- CN203632348U CN203632348U CN201320793636.7U CN201320793636U CN203632348U CN 203632348 U CN203632348 U CN 203632348U CN 201320793636 U CN201320793636 U CN 201320793636U CN 203632348 U CN203632348 U CN 203632348U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
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Abstract
The utility model discloses a high-voltage end energy supply system, and belongs to the power technology field; the energy supply system comprises a laser energy supply system, a current transformer online energy taking system and a DC/DC converter; when the power grid normally work or is in a transient process, the current transformer online energy taking system can control the DC/DC converter to output stable voltage, and the laser energy supply system is in power reduction hot backup work state; when the power grid is firstly powered or the power grid current is smaller than a wake up current of the current transformer online energy taking system, the laser energy supply system uses full power to control the DC/DC converter to output stable voltage; a low voltage zone combined unit can dynamically control the laser energy supply power according to a current measuring value. The mixed power supply system has no current dead zone or wake up time problem, can satisfy power supply work continuous stability requirement of the active electronic current transformer, and multi-path energy sources can provide higher work reliability for the mixed power supply system.
Description
Technical field
The utility model relates to power technology field, particularly a kind of high-pressure side energy supplying system.
Background technology
High-quality direct current power supply is the basis of high-pressure side monitoring equipment higher-pressure region electronic circuit stable operation, is also a key technology of high-pressure side monitoring.In intermediate voltage electric power system below 35KV, the insulation between high and low pressure more easily realizes, and electronic circuit can be operated in low-pressure area, and power supply also can directly be supplied by low-pressure area; In high pressure, superhigh pressure and extra-high voltage electric power system more than 110KV, insulation between high and low pressure realizes by optical fiber, without any electromagnetic connection, the power supply supply that how to obtain continous-stable in higher-pressure region just becomes a technical barrier in the development of high-pressure side monitoring equipment.At present, the subject matter existing in the research of high-pressure side monitoring equipment power supply and application has: energy supply power, reliable long-term working and manufacture maintenance cost.
In order to address the above problem, in prior art, there are the laser energy supplying system summation current transformer two kinds of energy supplying systems of system that deenergize online.
Laser energy supply technology maturation, at present, ABB, the product of the offshore companies such as Photonic Power Systems and Siemens adopts laser energy-provision way mostly, the outstanding advantages of laser energy supply is that power supply energy supply is stable, be not subject to the impact of electromagnetic interference and operation of power networks state, there is good development prospect, receive domestic and international researcher's concern.Laser energy supply major defect is that photronic conversion efficiency is lower, is generally 10-30%, and high-power photronic conversion efficiency is 22% left and right.Be greater than average life of solid state laser of 1W at 5000-6000 hour, i.e. continuous operation just needs about 1 year to change, and has produced thus high maintenance cost and work continued reliability problem.
The principle that current transformer is got energy is online: utilize electromagnetic induction principle, use conventional current instrument transformer directly to respond to alternating voltage from high voltage bus to be measured, then after over commutation, filtering, voltage stabilizing, supply with higher-pressure region circuit and use.The power supply potential that current transformer is got energy mode is online suspended in higher-pressure region, therefore be called floated power supply.Because getting online energy, floated power supply must be subject to the impact of operation of power networks state.Very greatly, minimum may only have several amperes to the dynamic range that electrical network bus current changes, and transient current may reach tens of kiloamperes while being short-circuited fault.Therefore, one of design difficulty of floated power supply is less work dead band: when bus current is while approaching unloaded little electric current, should be able to obtain enough energy to guarantee power supply supply, wake electric current up little; In the time that bus current is current state, except guaranteeing, energy supply, also will to give power supply itself enough protections, avoid because of the high amplitude burst pulse voltage of the saturated generation of current transformer, power supply and follow-up electronic circuit being caused damage.Therefore, that current transformer is got is online can circuit simple, cost is low, but has energy supply power, wakeup time and (or) electric current dead-time problem.
Utility model content
In order to address the above problem, thereby the utility model proposes a kind of high-pressure side energy supplying system of laser energy supply summation current transformer being got online to the continous-stable problem of the solution power work that can combine.
The high-pressure side energy supplying system that the utility model provides comprises that laser energy supplying system, current transformer are got online can system and DC/DC transducer,
During when the normal work of electrical network or in transient process, described current transformer get online can system control described in DC/DC transducer regulated output voltage, laser energy supplying system is in falling power Hot Spare operating state;
When electrical network switch on first or power network current be less than current transformer get online can wake electric current up time, DC/DC transducer regulated output voltage described in the control of described laser energy supplying system full power;
The control of described laser energy supply power is dynamically controlled according to current measurement value by low-pressure area merge cells.
As preferably, described transient process comprises that circuit cut-offs in short-term, reclosing.
As preferably, described current transformer is got online and can system be comprised quick-magnetic saturated current transformer, magnetic valve type saturating current transformer, peak voltage suppresses limiting protector, full-bridge rectification protector, pre-regulator, PWM, peak voltage suppresses and limiting protector, in the time that a bus passes through electric current, quick-magnetic saturated current transformer and magnetic valve type saturating current transformer secondary output produce ac induction voltage, after full-bridge rectification, become pulsating dc voltage, adopt PWM switch power technology to carry out pre-voltage stabilizing, again after two mode filter filtering, by DC/DC transducer regulated output voltage, for follow-up electronic circuit, in the time that a bus current is large electric current, quick-magnetic saturated current transformer and magnetic valve type saturating current transformer secondary output produce the peaking voltage of high amplitude, and described peak voltage suppresses and limiting protector is used for described peak voltage to suppress and current-limiting protection.
As preferably, described current transformer comprises multiple quick-magnetic saturated current transformers and multiple magnetic valve type saturating current transformer, described multiple quick-magnetic saturated current transformers and multiple magnetic valve type saturating current transformer composition connection in series-parallel array.
As preferably, the iron core of described quick-magnetic saturated current transformer is made up of permalloy 1J85.
As preferably, the maximum load current threshold values of described quick-magnetic saturated current transformer is 2.88A.
As preferably, the core material of described magnetic valve type saturating current transformer is selected from selects 27QG100,30QG110,35QG125,35W230 cold-reduced silicon sheet.
The high-pressure side energy supplying system that the utility model provides adopted current transformer get online can and laser energy-provision way combine and just form hybrid power source system.There is not electric current dead band and wakeup time problem in this hybrid power source system, can meet the continous-stable requirement of Active Electronic Current Transformer to power work, and multipath energy source can be hybrid power source system higher functional reliability is provided.
Accompanying drawing explanation
The schematic diagram of the high-pressure side energy supplying system that Fig. 1 provides for the utility model embodiment;
The apparatus structure schematic diagram that in the high-pressure side energy supplying system that Fig. 2 provides for the utility model embodiment, quick-magnetic saturated current transformer is carried out to operating characteristic test.
Embodiment
In order to understand the utility model in depth, below in conjunction with drawings and the specific embodiments, the utility model is elaborated.
Referring to accompanying drawing 1, the high-pressure side energy supplying system that the utility model provides comprises that laser energy supplying system, current transformer are got online can system and DC/DC transducer, during when the normal work of electrical network or in transient process, current transformer is got online and can be stablized output ± 5V voltage by system control DC/DC transducer, and laser energy supplying system is in falling power Hot Spare operating state; When electrical network switch on first or power network current be less than current transformer get online can wake electric current up time, laser energy supplying system full power control DC/DC transducer is stablized output ± 5V voltage; The control of laser energy supply power is dynamically controlled according to current measurement value by low-pressure area merge cells.These two kinds of energy supplying systems, at line parallel, access same power-supply management system, after electric power management circuit is processed, export a stable direct current.
The high-pressure side energy supplying system that the utility model provides adopted current transformer get online can and laser energy-provision way combine and just form hybrid power source system.There is not electric current dead band and wakeup time problem in this hybrid power source system, can meet the continous-stable requirement of Active Electronic Current Transformer to power work, and multipath energy source can be hybrid power source system higher functional reliability is provided.
Wherein, transient process comprises that circuit cut-offs in short-term, reclosing.
Wherein, current transformer is got online and can system be comprised quick-magnetic saturated current transformer, magnetic valve type saturating current transformer, peak voltage suppresses limiting protector, full-bridge rectification protector, pre-regulator, PWM, peak voltage suppresses and limiting protector, in the time that a bus passes through electric current, quick-magnetic saturated current transformer and magnetic valve type saturating current transformer secondary output produce ac induction voltage, after full-bridge rectification, become pulsating dc voltage, adopt PWM switch power technology to carry out pre-voltage stabilizing, again after two mode filter filtering, by the stable output ± 5V voltage of DC/DC transducer, for follow-up electronic circuit.In the time that a bus current is large electric current, quick-magnetic saturated current transformer and magnetic valve type saturating current transformer secondary output produce the peaking voltage of high amplitude, and peak voltage suppresses and limiting protector is used for peak voltage to suppress and current-limiting protection.
Wherein, current transformer comprises multiple quick-magnetic saturated current transformers and multiple magnetic valve type saturating current transformer, multiple quick-magnetic saturated current transformers and multiple magnetic valve type saturating current transformer composition connection in series-parallel array, those skilled in the art can determine according to actual demands of engineering the quantity of quick-magnetic saturated current transformer and magnetic valve type saturating current transformer.
Wherein, the iron core of quick-magnetic saturated current transformer is made up of permalloy 1J85.
Wherein, the maximum load current threshold values of quick-magnetic saturated current transformer is 2.88A.
Wherein, the core material of magnetic valve type saturating current transformer is selected from and selects 27QG100,30QG110,35QG125,35W230 cold-reduced silicon sheet.
Wherein, the concrete steps of quick-magnetic saturated current transformer design are as follows:
The primary current dynamic change scope of quick-magnetic saturated current transformer work is 2-50A, design focal point be to reduce wake that electric current and primary current guarantee when larger to get up can the time.Therefore, the design object of quick-magnetic saturated current transformer is: in the time that primary current is 1.5A, secondary winding induced potential effective value is 5V; In the time that primary current is 50A, getting when secondary winding induced potential instantaneous value is greater than 5V can be 10ms the time.
1, core material is selected
When current transformer structure one timing, according to formula (3)
Wherein, E
2for the effective value of secondary winding induced potential, f is primary current i
1frequency, B
mfor the peak value of iron-core magnetic induction intensity, N
2be 2 umber of turns.
Want to obtain higher secondary induced potential E
2, should make B
mincrease; In the time that primary current is very little, obtain larger B
mjust require iron core to there is very high initial permeability.Meanwhile, in the time that primary current is larger, in order to limit the average induced voltage Ea of secondary winding output, from formula (4),
Iron core should have lower saturation induction density B
s, and, if B
slower, the loss of iron core is just less, and temperature rise is also less.
According to above principle, select magnetic permeability is high, saturation induction density is low permalloy 1J85 as core material.
2, quick-magnetic saturated current transformer structural design
Conventionally, current transformer structure design the electromagnetic performance of current transformer, also will be considered the factors such as loss, temperature rise, winding insulation and installing space except considering.In the time only considering the electromagnetic performance of current transformer and requirements of installation space, we provide rough computational methods to core structure size and coil turn, need a large amount of experimental verifications simultaneously.
3, load current threshold values is adjusted
For constant load, in the time that a bus current increases gradually, secondary winding in current transformer induced voltage also increases gradually, and load current also increases thereupon, and system temperature rise will be increased.For restriction system temperature rise, need to limit maximum load current, the load current threshold values of adjusting.Threshold values is chosen excessive, can cause system temperature rise higher; Threshold values is chosen too small, can make iron core enter too early saturation region, and minimizing is got the energy time and reduced current transformer power output.Solution is to be to guarantee to get under the prerequisite that the energy time is 10ms, calculates maximum load current threshold values, then according to wire diameter and the power supply current-limiting circuit of this threshold values design current instrument transformer secondary winding, to guarantee that system temperature rise is within allowed band.
In the time of core sataration, the magnetic field intensity of iron core is 5.296A/m, and required exciting current effective value is 1.083A.As bus current 50A, get can the time be 10ms time, maximum load current threshold values is:
4, operating characteristic test
Referring to accompanying drawing 2, permalloy 1J85 material price is higher, therefore, operating characteristic test adopts the less quick-magnetic saturated current transformer of power output, and its structural parameters are: D=80mm, d=20mm, h=30mm, in experimental rig, 1 represents autotransformer, 2 represent current lifting device, 3 represent clamp on amperemeter, and 4 represent copper rod, and 5 represent to get online energy device, wherein, load resistance is 50 Ω.
The specific design method of magnetic valve type saturating current transformer is as follows:
1, operation principle
In ordinary electric current mutual-inductor saturation history, magnetic permeability variation and primary current variation mismatch have caused secondary winding induced potential to distort as peaking voltage.If in core sataration process, to divide between some Current Zone, magnetic permeability variation is controlled in each interval makes it match with corresponding interval curent change, and iron core all can meet the requirement to getting the energy time in whole magnetic saturation process.
Magnet valve is set in ordinary electric current mutual-inductor magnetic circuit and forms magnetic valve type current transformer.If by magnet valve regulate get online can current transformer the effective permeability of magnetic circuit, to meet and the requirement of the desirable fitting curves of primary current, the design of magnet valve shape, sectional area and length will be very complicated, thereby cause processing difficulties.But if realize the interval registration property between effective permeability and primary current, the design of magnet valve sectional area and length and processing are much easier.Therefore magnetic valve type saturating current transformer adopts effective permeability and the interval fitting method design of primary current.
Interval fitting method requires to arrange some sectional areas and length magnet valve not etc. in iron circuit.In the time that the not enough so that a certain magnet valve of magnetic flux in magnetic circuit is saturated, this magnet valve is operated in linear zone, and magnetic resistance is very little, can ignore; When magnetic flux in magnetic circuit increases while making it saturated, magnet valve magnetic resistance increases rapidly, and now this section of magnet valve is equivalent to the air gap of elongated degree, has changed the effective permeability of magnetic circuit.When one timing of magnetic circuit magnetic flux, whether saturated magnet valve is is determined by magnet valve sectional area.Therefore, can be decided by the sectional area of magnet valve the interval that coordinates of current transformer effective permeability and primary current, the effective permeability of current transformer in saturated this interval of magnet valve length control in whole magnetic circuit thus time.
Can be determined between n+2 section Current Zone by n section magnet valve.In each Current Zone, if meet the registration property requirement between iron core effective permeability and primary current, in whole primary current excursion secondary winding induced potential all by meet to get can the time requirement.
2, magnetic valve type saturating current transformer design
The primary current dynamic change scope of magnetic valve type saturating current transformer work is designed to 50-7000A, and emphasis will solve the classifying rationally in primary current interval and the matching problem with current transformer effective permeability.Design object is: within the scope of primary current dynamic change, getting when secondary winding induced potential instantaneous value is greater than 5V can the time be greater than 10ms.
(1) core material is selected
The effective permeability of magnetic valve type saturating current transformer is mainly controlled by the magnetically saturated magnet valve length of the degree of depth, and the magnetically saturated magnet valve of the degree of depth is equivalent to one section of air gap, if the magnetic permeability of iron core is higher, be easy to determine exactly the effective permeability of current transformer in given Current Zone.In order to widen the primary current dynamic change scope of operation of current transformers, iron core should have higher saturation induction density.But saturation induction density is higher, the loss of iron core is just larger, for reducing the wastage, should select thinner core material.
Therefore, core material should be selected high magnetic permeability, high saturated magnetic induction and low-loss thinner magnetic material, can consider to select 27QG100,30QG110,35QG125, the one in the cold-reduced silicon sheets such as 35W230.
Above embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; institute is understood that; these are only embodiment of the present utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any modification of making, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (7)
1. a high-pressure side energy supplying system, is characterized in that, comprising that laser energy supplying system, current transformer are got online can system and DC/DC transducer,
During when the normal work of electrical network or in transient process, described current transformer get online can system control described in DC/DC transducer regulated output voltage, laser energy supplying system is in falling power Hot Spare operating state;
When electrical network switch on first or power network current be less than current transformer get online can wake electric current up time, DC/DC transducer regulated output voltage described in the control of described laser energy supplying system full power;
The control of described laser energy supply power is dynamically controlled according to current measurement value by low-pressure area merge cells.
2. high-pressure side energy supplying system according to claim 1, is characterized in that, described transient process comprises that circuit cut-offs in short-term, reclosing.
3. high-pressure side energy supplying system according to claim 1, it is characterized in that, described current transformer is got online and can system be comprised that quick-magnetic saturated current transformer, magnetic valve type saturating current transformer, peak voltage suppress limiting protector, full-bridge rectification protector, pre-regulator, PWM, peak voltage inhibition and limiting protector;
In the time that a bus passes through electric current, quick-magnetic saturated current transformer and magnetic valve type saturating current transformer secondary output produce ac induction voltage, after full-bridge rectification, become pulsating dc voltage, adopt PWM switch power technology to carry out pre-voltage stabilizing, again after two mode filter filtering, by DC/DC transducer regulated output voltage, for follow-up electronic circuit;
In the time that a bus current is large electric current; quick-magnetic saturated current transformer and magnetic valve type saturating current transformer secondary output produce the peaking voltage of high amplitude, and described peak voltage suppresses and limiting protector is used for described peak voltage to suppress and current-limiting protection.
4. high-pressure side energy supplying system according to claim 3, it is characterized in that, described current transformer comprises multiple quick-magnetic saturated current transformers and multiple magnetic valve type saturating current transformer, described multiple quick-magnetic saturated current transformers and multiple magnetic valve type saturating current transformer composition connection in series-parallel array.
5. high-pressure side energy supplying system according to claim 4, is characterized in that, the iron core of described quick-magnetic saturated current transformer is made up of permalloy 1J85.
6. high-pressure side energy supplying system according to claim 4, is characterized in that, the maximum load current threshold values of described quick-magnetic saturated current transformer is 2.88A.
7. high-pressure side energy supplying system according to claim 4, is characterized in that, the core material of described magnetic valve type saturating current transformer is selected from 27QG100,30QG110,35QG125, the one in 35W230 cold-reduced silicon sheet.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730947A (en) * | 2013-12-04 | 2014-04-16 | 国家电网公司 | Hybrid type high voltage terminal energy supply system |
| CN104200978A (en) * | 2014-09-04 | 2014-12-10 | 国家电网公司 | Intelligent current transformer wide-range electricity acquisition method |
| CN106487043A (en) * | 2015-08-26 | 2017-03-08 | 国网智能电网研究院 | A kind of hybrid integrated high-level energy supplying system for high voltage DC breaker |
| CN106487044A (en) * | 2015-08-26 | 2017-03-08 | 国网智能电网研究院 | A kind of hybrid integrated high-level energy supply method for high voltage DC breaker |
| CN108321759A (en) * | 2018-02-13 | 2018-07-24 | 全球能源互联网研究院有限公司 | Dc circuit breaker energy supplying system |
-
2013
- 2013-12-04 CN CN201320793636.7U patent/CN203632348U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730947A (en) * | 2013-12-04 | 2014-04-16 | 国家电网公司 | Hybrid type high voltage terminal energy supply system |
| CN104200978A (en) * | 2014-09-04 | 2014-12-10 | 国家电网公司 | Intelligent current transformer wide-range electricity acquisition method |
| CN104200978B (en) * | 2014-09-04 | 2016-06-29 | 国家电网公司 | A kind of current transformer intelligent electricity-fetching method |
| CN106487043A (en) * | 2015-08-26 | 2017-03-08 | 国网智能电网研究院 | A kind of hybrid integrated high-level energy supplying system for high voltage DC breaker |
| CN106487044A (en) * | 2015-08-26 | 2017-03-08 | 国网智能电网研究院 | A kind of hybrid integrated high-level energy supply method for high voltage DC breaker |
| CN108321759A (en) * | 2018-02-13 | 2018-07-24 | 全球能源互联网研究院有限公司 | Dc circuit breaker energy supplying system |
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Granted publication date: 20140604 Termination date: 20211204 |