CN108599280A - The online power-supply circuit of DC transmission system current limiter and system - Google Patents
The online power-supply circuit of DC transmission system current limiter and system Download PDFInfo
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- CN108599280A CN108599280A CN201810412630.8A CN201810412630A CN108599280A CN 108599280 A CN108599280 A CN 108599280A CN 201810412630 A CN201810412630 A CN 201810412630A CN 108599280 A CN108599280 A CN 108599280A
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- 235000008434 ginseng Nutrition 0.000 description 1
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Abstract
The present invention provides the online power-supply circuit of DC transmission system current limiter and systems, are related to flexible DC transmission technology field, wherein the online power-supply circuit of DC transmission system current limiter includes：First inductance exists with the second inductance to be coupled, and is connected with power electronics switching switch, is constituted current limiter main circuit；Third inductance is coupled with the presence of the first inductance and rectification energy-storage units are connected, and constitutes online power-supply circuit, in use, the first inductance and the second inductive coupling, switch switch with power electronics and constitute current limiter main circuit, when power electronics switching switch is closed, current limiter main circuit inductance value is smaller；When electric current is more than some threshold value, power electronics switches switch OFF, and current limiter main circuit inductance value is significantly increased；Third inductance exists with the first inductance to be coupled, and when main circuit current changes in the first inductance, third inductance both ends generate induced voltage and induced current, rectified energy-storage units storage energy, and provide power supply for the driving of the power electronic equipment of main circuit.
Description
Technical field
The present invention relates to flexible DC transmission technology field more particularly to the online power-supply circuits of DC transmission system current limiter
And system.
Background technology
Flexible direct current power transmission system is the important directions of current power System Development.Flexible direct current power transmission system is in structure
It is similar with D.C. high voltage transmission, it is a kind of novel based on voltage source converter, self-turn-off device and pulse modulation technology
Technology of transmission of electricity, the technology of transmission of electricity have can to passive network power, be not between commutation failure, current conversion station without communication and
The advantages that being readily configured MTDC transmission system.There are a large amount of detection, communication equipment and power electronics device in flexible direct current system
Part still provides driving power presence in HVDC transmission system for these detection, communication equipment and power electronic devices
Certain difficulty.
For traditional AC system, can energy easily be obtained from main circuit using mutual inductor, be supplied to various inspections
It surveys, communicate, driving circuit, in this way, without individually power supply, system is reliable and stable, without considering Insulation Problems.And in flexible direct current
In transmission system, because main circuit is DC current, the mode of mutual inductance can not be used to directly acquire energy from main circuit.For this
Kind circuit, there are mainly two types of patterns to provide power supply at present：One, in equipment both ends shunt capacitance.Use main circuit to capacitance first
Then charging provides driving energy using the energy of capacitance storage for detection, communication equipment and power electronic devices.But this
Kind mode requires equipment in working condition, and both ends must always exist voltage difference.Equipment both ends do not have when two, for normal work
There is the case where voltage difference, can only be powered using external power supply.Such as dc circuit breaker, both end voltage is zero when normal work.It adopts
More demanding to power supply system insulating Design with external power supply power supply mode, power-supply system overall cost is very high.Current limiter is normal
When work, both end voltage is essentially close to zero, so power supply can not be provided for equipment with the method that shunt capacitance charges.If
It using external independent current source, then can increase system insulation design difficulty, increase system cost.
To sum up, it can not be set at present to the detection of current limiter, communication equipment and power electronics about flexible direct current power transmission system
Standby driving directly effectively provides the problem of power supply, there is no reliable solution.
Invention content
In view of this, the embodiment of the present invention be designed to provide the online power-supply circuit of DC transmission system current limiter and
System can by the way that the first inductance, the second inductance, third inductance, power electronics switching switch and rectification energy-storage units etc. are arranged
Energy is effectively stored, and the detection to current limiter, communication equipment and power electronic equipment driving provide power supply in time.
In a first aspect, an embodiment of the present invention provides the online power-supply circuits of DC transmission system current limiter, including：First electricity
Sense, the second inductance, power electronics switching switch, third inductance and rectification energy-storage units；
First inductance and the second inductive coupling switch the current limiter main circuit that switch is constituted, in normal work with power electronics
Make power electronics switching switch under state to be closed, the inductance value of the main circuit of current limiter is the first numerical value；
When detecting that main circuit current is more than predetermined threshold value, power electronics switches switch OFF, current limiter main circuit electricity
Inductance value increases to second value, to limit increase in current speed when short circuit occurs for main circuit, wherein second value is more than first
Numerical value；
The third inductance exists with the first inductance and couples, for generating induced electricity when main circuit current changes
Pressure and induced current, energy is provided for rectification energy-storage units.
With reference to first aspect, an embodiment of the present invention provides the first possible embodiments of first aspect, wherein also
Including the first varistor, first varistor is connected in parallel on the both ends of first inductance；
First varistor, the size for limiting the first inductance both end voltage.
The possible embodiment of with reference to first aspect the first, an embodiment of the present invention provides second of first aspect
Possible embodiment, wherein further include the second varistor, second varistor and second inductance in parallel；
Second varistor, the size for limiting the second inductance both end voltage.
The possible embodiment of with reference to first aspect the first, an embodiment of the present invention provides the third of first aspect
Possible embodiment, wherein the rectification energy-storage units include full-wave rectification subelement, energy-storage battery and the control being sequentially connected
System circuit, the full-wave rectification subelement are connected with the third inductance, and the control sub-circuit is cut with the power electronics
Switch is changed to be connected；
The full-wave rectification subelement, the sense for when electric current changes in the first inductance, being generated to third inductance
Induced current carries out full-wave rectification；
The energy-storage battery, the energy for storing the full-wave rectification subelement output；
The control sub-circuit is switched on-off for controlling the main circuit power electronics switching.
With reference to first aspect, an embodiment of the present invention provides the 4th kind of possible embodiments of first aspect, wherein institute
Power electronics switching switch is stated when being closed, total inductance value is Lab1=L1(1-k12 2)；
When off, total inductance value is L to the power electronics switching switchab1=L1；
Wherein, L1For first inductance value, k12For the coefficient of coup of the first inductance and the second inductance.
With reference to first aspect, an embodiment of the present invention provides the 5th kind of possible embodiments of first aspect, wherein institute
Power electronics switching switch is stated when being closed, total inductance value is
When off, total inductance value is L to the power electronics switching switchab2=L1；
Wherein, L1For first inductance value, L2For second inductance value, k12For the coupling of the first inductance and the second inductance
Collaboration number.
With reference to first aspect, an embodiment of the present invention provides the 6th kind of possible embodiments of second aspect, wherein institute
Power electronics switching switch is stated when being closed, total inductance value is Lab3=L1(1-k12 2)；
When off, total inductance value is the power electronics switching switch
Wherein, L1For first inductance value, L2For second inductance value, k12For the coupling of the first inductance and the second inductance
Collaboration number.
Second of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 7th kind of first aspect
Possible embodiment, wherein first varistor and second varistor are metal oxide resistor；
First varistor and second varistor are used to overvoltage protection.
The 5th kind of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 8th kind of first aspect
Possible embodiment, wherein further include solar cell；
The solar cell, for converting the solar energy got to electric energy, and, the electric energy is supplied into the storage
It can battery.
Second aspect, an embodiment of the present invention provides the online electricity getting systems of DC transmission system current limiter, including：State is supervised
It surveys, control, protect circuit and such as the online power-supply circuit of claim 1-9 any one of them DC transmission system current limiters；
The status monitoring control circuit generates voltage, electric current, energy-storage battery dump energy for monitoring third inductance,
Online power-supply circuit overvoltage overcurrent protection, triggering power electronics switching switch, and communicated with the external world.
The online power-supply circuit of DC transmission system current limiter provided in an embodiment of the present invention and system, wherein the direct current is defeated
The online power-supply circuit of electric system current limiter includes：First inductance, the second inductance, power electronics switching switch, third inductance and whole
Energy-storage units, the first inductance and the second inductive coupling are flowed, switches the current limiter main circuit that switch is constituted with power electronics, normal
Power electronics switching switch is closed under working condition, and the inductance value of the main circuit of current limiter is the first numerical value, when detecting main electricity
When road electric current is more than predetermined threshold value, power electronics switches switch OFF, and current limiter main circuit inductance value increases to second value, with
Increase in current speed is limited when short circuit occurs for main circuit, wherein second value is more than the first numerical value, third inductance, with first
There is coupling in inductance, for generating induced voltage and induced current when the main circuit current where the first inductance changes,
Energy is provided to rectification energy-storage units, in this application, when main circuit current is more than predetermined threshold value, power electronics switching switch
Shutdown, current limiter main circuit inductance value increase to second value, with the limitation increase in current speed when short trouble occurs for main circuit
Degree, and make the rectification energy-storage units real-time storage energy storage being attached thereto can by above-mentioned processing procedure by third inductance
Magnetic-coupled principle is efficiently used, makes circuit when the first inductive current changes, passes through third inductance and rectification energy storage list
First storage energy, and the energy supply equipment of storage is used, to eliminate the detection for current limiter, communication equipment and
Power electronic equipment driving provides the process of external power supply, can be easily and effectively that rear end equipment is powered.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that understand through the implementation of the invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and is obtained in attached drawing.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 shows the first connection of the online power-supply circuit of DC transmission system current limiter that the embodiment of the present invention is provided
Figure；
Fig. 2 shows the second connections of the online power-supply circuit of DC transmission system current limiter that the embodiment of the present invention is provided
Figure；
Fig. 3 shows the third connection for the online power-supply circuit of DC transmission system current limiter that the embodiment of the present invention is provided
Figure.
Specific implementation mode
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, the detailed description of the embodiment of the present invention to providing in the accompanying drawings is not intended to limit claimed invention below
Range, but it is merely representative of the selected embodiment of the present invention.Based on the embodiment of the present invention, those skilled in the art are not doing
The every other embodiment obtained under the premise of going out creative work, shall fall within the protection scope of the present invention.
Currently, the main circuit in flexible direct current power transmission system generally uses DC current, thus, mutual inductance can not be used
Mode directly acquires energy from main circuit.It is existing mainly to there are following two patterns to provide power supply for it：One, in equipment two
Hold shunt capacitance.In use, first, using main power source to capacitor charging, it is inspection then to utilize the energy of capacitance storage
It surveys, communication equipment and power electronic devices provide driving energy.But this mode requires equipment in working condition, both ends
Voltage difference must be always existed.Equipment both ends do not have the case where voltage difference when two, for normal work, can only use external power supply
Power supply.Such as dc circuit breaker, both end voltage is zero when normal work.But external power supply power supply mode is used, to power supply system
Insulating Design is more demanding, and power-supply system overall cost is very high, is unfavorable for promoting and applying.
Based on this, an embodiment of the present invention provides the online power-supply circuit of DC transmission system current limiter and systems, lead to below
Embodiment is crossed to be described.
Embodiment 1
Referring to Fig. 1, Fig. 2 and Fig. 3, the online power-supply circuit of DC transmission system current limiter that the present embodiment proposes specifically wraps
It includes：First inductance, the second inductance, power electronics switching switch, third inductance and rectification energy-storage units, the first inductance and the second electricity
Sense coupling, because between 0~1 coupling is just not present, such case is for second in Fig. 2 in the coefficient of coup when being 0
The third circuit in kind of circuit and Fig. 3 be also can.Switch the current limiter main circuit that switch is constituted with power electronics,
Power electronics switching switch is closed under normal operating conditions, and the inductance value of the main circuit of current limiter is the first numerical value, when detecting
When main circuit current is more than predetermined threshold value, power electronics switches switch OFF, and current limiter main circuit inductance value increases to the second number
Value needs to illustrate to limit increase in current speed when short circuit occurs for main circuit, and second value is more than the first number
Value, third inductance exist with the first inductance and couple, for generating induction when main circuit current where the first inductance changes
Voltage and induced current provide energy to rectification energy-storage units, need to illustrate, and rectification energy-storage units include phase successively
Full-wave rectification subelement even, energy-storage battery and control sub-circuit, full-wave rectification subelement are connected with third inductance, control son electricity
Road is connected with switching switch, and full-wave rectification subelement is for when electric current changes in the first inductance, generating third inductance
Induced current carry out full-wave rectification, energy-storage battery be used for store full-wave rectification subelement output energy, control sub-circuit use
It is switched on-off in control main circuit power electronics switching.When the electrical equipment of rear end needs in use, can be by the energy supply
Electrical equipment is used, and above-mentioned electrical equipment includes detection, communication equipment and power electronics driving equipment of current limiter etc..
In addition it needs to illustrate, M12For the mutual inductance value of the first inductance and the second inductance, definition
Wherein, k12For the coefficient of coup of the first inductance and the second inductance, and 0≤k12≤1。M13For the mutual of the first inductance and third inductance
Inductance value.DefinitionWherein, k13For the coefficient of coup of the first inductance and third inductance, and 0≤k13≤1.In reality
In the circuit of border, the second inductance can also have mutual inductance with third inductance, but the mutual inductance value can be designed smaller, not influence this circuit
Main feature.
When what is inputted in the first inductance is ideal DC, electric current does not have any variation, at this point, will not be produced in third inductance
Raw induced voltage, rectification energy-storage units are given without energy transmission.But according to the design of the current limiter main circuit, in ideal DC shape
Under state, principal current is flowed through from the first inductance in Fig. 1, and switching switch can open a way, and be triggered without energy.Principal current in Fig. 2
It is flowed through from the first inductance, switching switch can open a way, and be triggered without energy.Principal current is from the first inductance and second in Fig. 3
Inductance flows through.Switching switch can open a way, and be triggered without energy.So under ideal DC case, the rectification energy storage list
Member is obtained less than any energy.But due to the particularity of the current limiter working condition, current limiter main body can still work normally.
It is difficult the electric current that keeps constant in project implementing process, in the first inductance, it will usually which the fluctuation for having electric current is being
When system electric current has fluctuation, portion of energy can be transferred to power-supply circuit by third inductance.Because of detection, communication, driving circuit entirety work(
Consumption is very low (being less than 10W), so, the energy-storage battery in Fig. 1, Fig. 2 and Fig. 3 is used for extra energy stores to get up, in case after
The detection at end, communication, driving circuit can work normally under the fluctuation of main circuit no current or off state.
In addition, the online power-supply circuit of DC transmission system current limiter further includes the first varistor, the first varistor is simultaneously
The both ends of the first inductance are associated in, in use, the first varistor is used to limit the size of the first inductance both end voltage.
In addition, the online power-supply circuit of DC transmission system current limiter further includes the second varistor, the second varistor with
Second inductance in parallel, in use, the second varistor is used to limit the size of the second inductance both end voltage.
In addition, as shown in Fig. 2, the online power-supply circuit of DC transmission system current limiter further includes third varistor, third
Varistor switches switch in parallel with power electronics, in use, third varistor is for limiting power electronics switching switch two
The size of terminal voltage.
It additionally needs and illustrates, above-mentioned first varistor and the second varistor and third varistor are
Metal oxide varistor, the first varistor and the second varistor and third varistor are used to overvoltage protection.
In addition it needs to illustrate, the specific type of attachment of the first inductance and the second inductance includes following several：
(1) as shown in Figure 1, power electronics switching switch is when being closed, total inductance value is Lab1=L1(1-k12 2), electric power electricity
When off, total inductance value is L to son switching switchab1=L1, need to illustrate, L1For the first inductance value, k12It is first
The coefficient of coup of inductance and the second inductance.
(2) as shown in Fig. 2, power electronics switching switch is when being closed, total inductance value is
When off, total inductance value is L to power electronics switching switchab2=L1, need to illustrate, L1For the first inductance value, L2
For the second inductance value, k12For the coefficient of coup of the first inductance and the second inductance.
(3) as shown in figure 3, power electronics switching switch is when being closed, total inductance value is Lab3=L1(1-k12 2), electric power electricity
When off, total inductance value is son switching switchIt needs to illustrate, L1For the first electricity
Inductance value, L2For the second inductance value, k12For the coefficient of coup of the first inductance and the second inductance.
When work, electric current is flowed into from a (+) end in diagram, b (-) end outflow.Circuit is normal shown in Fig. 1, Fig. 2, Fig. 3
When working condition, power electronics switches switch S and is closed, and needs to illustrate, and above-mentioned power electronics switching switch can be
The quick device for high-power power electronic such as IGBT.According to mutual inductance calculation formula, L in Fig. 1ab1=L1(1-k12 2), work as k12=1 full coupling
There is L when conjunctionab1=0.In Fig. 2Work as k12There is L when=1 unity coupingab2=0.L in Fig. 3ab3=L1
(1-k12 2), work as k12There is L when=1 unity coupingab3=0.So in normal state, the ends ab equivalent inductance value Lab1、Lab2And Lab3Compared with
It is small, the dynamic property of system is influenced small.In ideal DC state, the non-inductive electric current of the second inductor loop in Fig. 1, system without
Loss.System power is all from the first inductance L in Fig. 21Branch passes through, the second inductance L2Switch in switch S branches with power electronics
No current (because electronic switch has conduction voltage drop), circuit is lossless；System power is all from the first inductance L in Fig. 31, second
Inductance L2Pass through, no current (because electronic switch has conduction voltage drop) in power electronics switching switch S, circuit is lossless.
When the electric current of circuit changes, induced current will be generated in Fig. 1 in the second inductance；In Fig. 2 the second inductance with
Induced current is generated in power electronics switching switch S branches；In Fig. 3 electric current is generated in power electronics switching switch S.In the process
In, since power electronics switches the presence of switch conduction pressure drop, at this point, there are certain energy damages by power electronics switching switch S
Consumption.
When induced current is more than preset threshold value, L in cut-out power electronics switching switch S, Fig. 1ab1=L1, compared to
Inductance value is increased when normal condition；L in Fig. 2ab2=L1, inductance value is increased when compared to normal condition；In Fig. 3Wherein k12It is electric when compared to normal condition for the coefficient of coup of the first inductance and the second inductance
Inductance value is increased.The increased inductance is connected in series in former DC transmission system main circuit, it will reduces system short-circuit electric current
Growth rate reduces requirement of the system to dc circuit breaker.From the point of view of the amplitude that inductance value changes, circuit inductance values shown in Fig. 3
Increasing degree is maximum, and Fig. 3 circuits are optimum structure.
In systems in practice, it needs according to the first inductance value of System Parameter Design, the second inductance value, mutual inductance k12,
Three inductance values, mutual inductance k13, the first varistor, the second varistor and third varistor concrete numerical value.According to ginseng
Several different designs, the above circuit, which can develop, other ball bearing mades, within the application protection domain.
The quick device for high-power power electronic such as IGBT can be used in above-mentioned power electronics power electronics switching switch, is used for
Increase in current rate is reduced before dc circuit breaker effectively shutdown.
In addition it needs to illustrate, M12For the mutual inductance value of the first inductance and the second inductance, definition
Wherein, k12For the coefficient of coup of the first inductance and the second inductance, and 0≤k12≤1。
In addition it needs to illustrate, M13For the mutual inductance value of the first inductance and third inductance, definition
Wherein, k13For the coefficient of coup of the first inductance and the second inductance, and 0≤k13≤1。
In addition it needs to illustrate, it is in systems in practice, right because electric current is very faint in third inductor loop
Lab1, Lab2, Lab3Influence it is very small, so ignoring the influence of third inductance in above-mentioned calculating current limiter total inductance.Because of the electricity
Road is adapted to straight-flow system, so generally using air reactor, the first inductance and the second inductive coupling coefficient are difficult to accomplish k12
=1.It is general to require to ensure certain total inductance value also, to ensure that filtering needs in actual DC system, i.e., Fig. 1, Fig. 2 with
Total magnetic flux is not equal to 0 in the first inductance and the second inductance in Fig. 3, therefore, when straight-flow system main circuit current changes, the
Three inductor loops can generate induced current, and energy is provided for subsequent energy storage rectifier circuit.
In addition, the online power-supply circuit of DC transmission system current limiter further includes solar cell, solar cell is a kind of
Utilize the optoelectronic semiconductor thin slice of the sunlight direct generation of electricity.Solar cell can pass through photoelectric effect or photochemical effect handle
Solar energy is converted to electric energy.In the present embodiment, solar cell is connected with energy-storage battery, when in use, solar cell
For the solar energy got is efficiently converted into electric energy, also, will be in power storage to energy-storage battery.Due to the inspection of rear end
Survey, telecommunication circuit power consumption are relatively low (being generally less than 1W), so, on the circuit after outer plus solar cell, detection, telecommunication circuit
It remains to work always under long-time ideal DC or open circuit conditions, to the stabilization of effective guarantee rear end equipment work
Property.
In conclusion the online power-supply circuit of DC transmission system current limiter provided in this embodiment includes：First inductance,
Two inductance, third inductance, power electronics switching switch and rectification energy-storage units.First inductance and the second inductance are used cooperatively, the
Two inductance are connected with power electronics switching switch, constitute current limiter main circuit；Third inductance is connected with rectification energy-storage units, constitutes
Online power-supply circuit, when electric current changes in the first inductance, third inductance both ends generate induced voltage, then in third electricity
Circuit where sense generates electric current, and rectification energy-storage units are for storing the portion of energy, in this way, can be made using magnetic-coupled principle
Online power-supply circuit is set when main circuit current changes by third inductance storage energy, and by the energy supply of storage
It is standby to be used, so as to be easily and effectively that rear end equipment is powered.
Embodiment 2
Present embodiments providing the online electricity getting system of DC transmission system current limiter includes：The status monitoring that is connected, control
The online power-supply circuit of DC transmission system current limiter of system, protection circuit and any of the above-described, when in use, status monitoring, control
System, protection circuit be used for the online power-supply circuit of DC transmission system current limiter carry out status monitoring, control, protection and with the external world
It is communicated, includes specifically that voltage, electric current, accumulator dump energy are generated to monitoring third inductance, trigger power electronics
Switching switch, online power-supply circuit overvoltage overcurrent protection etc..In addition, when being connect with the external world, monitoring control circuit is also used
To be communicated with the external world.
In conclusion the online electricity getting system of DC transmission system current limiter provided in this embodiment includes：The shape being connected
State monitoring, control, the online power-supply circuit of DC transmission system current limiter for protecting circuit and any of the above-described, are using process
In, status monitoring, control, protection circuit be used for the online power-supply circuit of DC transmission system current limiter carry out status monitoring and with
The external world is communicated, and by status monitoring, control, the setting for protecting circuit, is strengthened online to DC transmission system current limiter
The real-time monitoring of the operating status of power-supply circuit, and make more convenient with extraneous communication.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
Specific work process, can refer to previous embodiment in corresponding process, details are not described herein.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.To those skilled in the art, it can understand above-mentioned term in the present invention with concrete condition
Concrete meaning.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
Finally it should be noted that：Embodiment described above, only specific implementation mode of the invention, to illustrate the present invention
Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope disclosed by the present invention, it can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent replacement of some of the technical features；And these modifications, variation or replacement, do not make
The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. the online power-supply circuit of DC transmission system current limiter, which is characterized in that including：First inductance, the second inductance, electric power electricity
Son switching switch, third inductance and rectification energy-storage units；
First inductance and the second inductive coupling switch the current limiter main circuit that switch is constituted with power electronics, in normal work shape
Power electronics switching switch is closed under state, and the inductance value of the main circuit of current limiter is the first numerical value；
When detecting that main circuit current is more than predetermined threshold value, power electronics switches switch OFF, current limiter main circuit inductance value
Increase to second value, to limit increase in current speed when short circuit occurs for main circuit, wherein second value is more than the first number
Value；
The third inductance, with the first inductance exist couple, for when main circuit current changes generate induced voltage and
Induced current provides energy for rectification energy-storage units.
2. the online power-supply circuit of DC transmission system current limiter according to claim 1, which is characterized in that further include first
Varistor, first varistor are connected in parallel on the both ends of first inductance；
First varistor, the size for limiting the first inductance both end voltage.
3. the online power-supply circuit of DC transmission system current limiter according to claim 2, which is characterized in that further include second
Varistor, second varistor and second inductance in parallel；
Second varistor, the size for limiting the second inductance both end voltage.
4. the online power-supply circuit of DC transmission system current limiter according to claim 1, which is characterized in that the rectification storage
Can unit include the full-wave rectification subelement being sequentially connected, energy-storage battery and control sub-circuit, the full-wave rectification subelement with
The third inductance is connected, and the control sub-circuit is connected with switching switch；
The full-wave rectification subelement, the induction for when first inductive current changes, being generated to third inductance
Electric current carries out full-wave rectification；
The energy-storage battery, the energy for storing the full-wave rectification subelement output；
The control sub-circuit is switched on-off for controlling the main circuit power electronics switching.
5. the online power-supply circuit of DC transmission system current limiter according to claim 1, which is characterized in that the electric power electricity
For son switching switch when being closed, total inductance value is Lab1=L1(1-k12 2)；
When off, total inductance value is L to the power electronics switching switchab1=L1；
Wherein, L1For first inductance value, k12For the coefficient of coup of the first inductance and the second inductance.
6. the online power-supply circuit of DC transmission system current limiter according to claim 1, which is characterized in that the electric power electricity
When being closed, total inductance value is son switching switch
When off, total inductance value is L to the power electronics switching switchab2=L1；
Wherein, L1For first inductance value, L2For second inductance value, k12For the coupled systemes of the first inductance and the second inductance
Number.
7. the online power-supply circuit of DC transmission system current limiter according to claim 1, which is characterized in that the electric power electricity
For son switching switch when being closed, total inductance value is Lab3=L1(1-k12 2)；
When off, total inductance value is the power electronics switching switch
Wherein, L1For first inductance value, L2For second inductance value, k12For the coupled systemes of the first inductance and the second inductance
Number.
8. the online power-supply circuit of DC transmission system current limiter according to claim 3, which is characterized in that first pressure
Quick resistance and second varistor are metal oxide resistor；
First varistor and second varistor are used to overvoltage protection.
9. the online power-supply circuit of DC transmission system current limiter according to claim 6, which is characterized in that further include the sun
It can battery；
The solar cell, for converting the solar energy got to electric energy, and, the electric energy is supplied into the energy storage electricity
Pond.
10. the online electricity getting system of DC transmission system current limiter, which is characterized in that including：Status monitoring, control, protection circuit
With such as online power-supply circuit of claim 1-9 any one of them DC transmission system current limiter；
The status monitoring control circuit, for monitor third inductance generate voltage, electric current, energy-storage battery dump energy, to
Line power-supply circuit carries out overvoltage overcurrent protection, triggering power electronics switching switch, and is communicated with the external world.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810412630.8A CN108599280B (en) | 2018-05-02 | 2018-05-02 | Current limiter on-line electricity taking circuit and system of direct current transmission system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810412630.8A CN108599280B (en) | 2018-05-02 | 2018-05-02 | Current limiter on-line electricity taking circuit and system of direct current transmission system |
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| CN108599280B CN108599280B (en) | 2020-04-21 |
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| Publication number | Publication date |
|---|---|
| CN108599280B (en) | 2020-04-21 |
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