CN103730947A - Hybrid type high voltage terminal energy supply system - Google Patents
Hybrid type high voltage terminal energy supply system Download PDFInfo
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- CN103730947A CN103730947A CN201310646781.7A CN201310646781A CN103730947A CN 103730947 A CN103730947 A CN 103730947A CN 201310646781 A CN201310646781 A CN 201310646781A CN 103730947 A CN103730947 A CN 103730947A
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Abstract
The invention discloses a hybrid type high voltage terminal energy supply system, and belongs to the technical field of electric power. The energy supply system comprises a laser energy supply system, a current transformer on-line energy taking system and a DC/DC converter. When a grid normally works or is in the transient process, the current transformer on-line energy taking system controls the DC/DC converter to stably output voltages, and the laser energy supply system is in the power reduction hot backup state. When the grid is powered on for the first time or the grid current is smaller than the awakening current for current transducer on-line energy taking, the laser energy supply system controls, in a full power mode, the DC/DC converter to stably output voltages. The laser energy supply power is dynamically controlled through a low voltage area merging unit according to the current measurement value. The hybrid power supply system is free of the problem of current dead zones and the problem of awakening time, and can meet the requirements of the active electronic type current transducer for continuous stability of work of a power supply, and higher work stability can be provided for the hybrid power supply system through multi-path energy resources.
Description
Technical field
The present invention relates to power technology field, particularly a kind of hybrid 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 more than 110KV, superhigh pressure and extra-high voltage electric power system, 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 from high voltage bus to be measured, to respond to alternating voltage, 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; When 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.
Summary of the invention
In order to address the above problem, thereby the present invention proposes a kind of hybrid 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.
Hybrid high-pressure side energy supplying system provided by the invention 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 is got online and can system be controlled described DC/DC transducer regulated output voltage, 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, described laser energy supplying system full power is controlled described DC/DC transducer regulated output voltage;
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, when 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, when 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 a plurality of quick-magnetic saturated current transformers and a plurality of magnetic valve type saturating current transformer, and described a plurality of quick-magnetic saturated current transformers and a plurality of magnetic valve type saturating current transformer form connection in series-parallel array.
As preferably, the iron core of described quick-magnetic saturated current transformer is made by 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.
Hybrid high-pressure side energy supplying system provided by the invention 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 hybrid high-pressure side energy supplying system that Fig. 1 provides for the embodiment of the present invention;
The apparatus structure schematic diagram that in the hybrid high-pressure side energy supplying system that Fig. 2 provides for the embodiment of the present invention, quick-magnetic saturated current transformer is carried out to operating characteristic test.
Embodiment
In order to understand the present invention in depth, below in conjunction with drawings and the specific embodiments, the present invention is described in detail.
Referring to accompanying drawing 1, hybrid high-pressure side energy supplying system provided by the invention 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 system be controlled the stable output ± 5V voltage of 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 is controlled the stable output ± 5V voltage of DC/DC transducer; 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.
Hybrid high-pressure side energy supplying system provided by the invention 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, when 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.When 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 a plurality of quick-magnetic saturated current transformers and a plurality of magnetic valve type saturating current transformer, a plurality of quick-magnetic saturated current transformers and a plurality of magnetic valve type saturating current transformer form connection in series-parallel array, and 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 by 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 to get when larger up can the time.Therefore, the design object of quick-magnetic saturated current transformer is: when primary current is 1.5A, secondary winding induced potential effective value is 5V; When 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; When primary current is very little, obtain larger B
mjust require iron core to there is very high initial permeability.Meanwhile, when 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.When 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, when 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.
When 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 in the time of the time being 10ms, 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 getting the requirement of 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 the requirement with 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.Yet 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.Magnetic flux in magnetic circuit is not enough so that a certain magnet valve when saturated, and this magnet valve is operated in linear zone, and magnetic resistance is very little, can ignore; Magnetic flux in magnetic circuit increases while making it saturated, and 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 coordinating of current transformer effective permeability and primary current interval, in the time of thus, in whole magnetic circuit, saturated magnet valve length is controlled the effective permeability of current transformer in this interval.
By n section magnet valve, can be determined between n+2 section Current Zone.In between 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 will meet getting the requirement of energy time.
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, emphasis to solve primary current interval classifying rationally and with the matching problem of 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 be greater than 10ms the time.
(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 interior current transformer between 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.Yet 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 the cold-reduced silicon sheets such as 27QG100,30QG110,35QG125,35W230.
Above embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; these are only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a hybrid 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 is got online and can system be controlled described DC/DC transducer regulated output voltage, 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, described laser energy supplying system full power is controlled described DC/DC transducer regulated output voltage;
The control of described laser energy supply power is dynamically controlled according to current measurement value by low-pressure area merge cells.
2. hybrid 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. hybrid 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;
When 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;
When 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. hybrid high-pressure side energy supplying system according to claim 3, it is characterized in that, described current transformer comprises a plurality of quick-magnetic saturated current transformers and a plurality of magnetic valve type saturating current transformer, and described a plurality of quick-magnetic saturated current transformers and a plurality of magnetic valve type saturating current transformer form connection in series-parallel array.
5. hybrid 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 by permalloy 1J85.
6. hybrid 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. hybrid 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 selects 27QG100,30QG110,35QG125,35W230 cold-reduced silicon sheet.
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| CN113410916A (en) * | 2021-08-20 | 2021-09-17 | 成都金迈微科技有限公司 | Monitoring system and method for photovoltaic power converter in optical fiber power supply system |
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Application publication date: 20140416 |