CN105743060A - Inductive small-load circuit breaker for DC power distribution system - Google Patents
Inductive small-load circuit breaker for DC power distribution system Download PDFInfo
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- CN105743060A CN105743060A CN201610237818.4A CN201610237818A CN105743060A CN 105743060 A CN105743060 A CN 105743060A CN 201610237818 A CN201610237818 A CN 201610237818A CN 105743060 A CN105743060 A CN 105743060A
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- circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
Abstract
The invention discloses an inductive small-load circuit breaker for a DC power distribution system. The inductive small-load circuit breaker comprises an opening-closing switching group, a resonant circuit, a freewheeling circuit, an inductive load and a triode, wherein the opening-closing switching group is used for breaking a closed load and filtering burrs generated by the load, the resonant circuit is connected with the opening-closing switching group and the freewheeling circuit and is used for generating capacitive impedance resonant with the inductive load, the freewheeling circuit is used for providing a current path for the inductive load and the resonant circuit after an insulated gate bipolar transistor (IGBT) is closed, the inductive load is connected with the freewheeling circuit and the IGBT, and the triode is connected with the freewheeling circuit. According to a principle of circuit resonance, the circuit breaker disclosed by the invention is reasonably and economically applied to the DC power distribution system; and the circuit current is consumed by the load until the circuit current is zero by means of a parallel resonant principle, the load is cut off, and the purpose of circuit protection is achieved.
Description
Technical field
The present invention relates to electrical engineering field and DC distribution field, particularly relate to a kind of perceptual Smaller load chopper for direct-flow distribution system.
Background technology
Direct current power system is mainly used in the occasions such as electric propulsion, regenerative resource distributed power grid and overlength distance high voltage power transmission.Along with track traffic, the Large scale construction of the systems such as D.C. high voltage transmission and planning, direct current transmission and distribution system has welcome a fast-developing gold period, and the correlational study work from system to equipment all becomes one emerging study hotspot of power industry.Although in different application scenarios, the basic operation characteristic of system is widely different, but is required for the power equipment of this key of dc circuit breaker without exception.
Dc circuit breaker is one of visual plant of direct-flow distribution system, and its Main Function is the method for operation changing straight-flow system, or removes the fault that DC side occurs.Its major function includes closing, carry and cut-offfing the electric current under normal loop condition, the converting system method of operation and disengagement failure electric current and system is carried out protection etc..
In the interrupting process of dc circuit breaker, contact will form electric arc after opening between contact, and therefore, the task of chopper is exactly make rapidly current over-zero, extinguish electric arc, and accelerating medium is recovered, it is prevented that again punctures and the restriking of electric arc.But, compared with AC system, owing to straight-flow system is absent from natural zero-crossing point so that it cut-offs more difficult, it is necessary to adopt certain technological means to force current over-zero.It addition, dc circuit breaker also needs to absorb the big energy being stored in system inductance in interrupting process.
For enabling direct-flow distribution system to form current zero-crossing point on major loop, existing dc circuit breaker adopts the method increasing sinusoidal current component so that the electric current after superposition is alternating current.So, the electric current after superposition can form current zero-crossing point on major loop, so that chopper can cut-off, reaches the purpose of protection DC circuit.But, there is obvious drawback in this kind of method.Due to the superposition of sinusoidal current, the power radius of circuit originally or equipment is raised by passive, and circuit must endure as higher voltage, even more than its rated voltage.So not only to increase the pressure voltage of original circuit or equipment, also can be greatly increased the loss of circuit and equipment, very uneconomical rationally.Nowadays the rated voltage of a lot of DC equipments itself is smaller, and the pressure voltage of himself is not high, and therefore Traditional DC chopper is completely inapplicable.
Summary of the invention
For the deficiency overcoming above-mentioned prior art to exist; the purpose of the present invention is in that to provide a kind of perceptual Smaller load chopper for direct-flow distribution system; the principle of its application parallel resonance; with when direct-flow distribution system needs conversion operation mode or disengagement failure electric current that system carries out carrying out protection; the electric capacity in chopper is made to produce damped vibration with the load with perception; circuit both end voltage and current in phase position; the reverse impact of inductance would not be excessive; make electric current purely by resistance absorption; finally reduce to zero, reach to cut off the purpose of load.
For reaching above-mentioned and other purpose, the present invention proposes a kind of perceptual Smaller load chopper for direct-flow distribution system, including:
Folding switches set, for disconnecting Guan Bi load and filtering the burr that load produces；
Resonance circuit, connects this folding switches set and freewheeling circuit, for producing and the capacitive reactances of inductive load resonance；
Freewheeling circuit, for providing current path to after IGBT closes inductive load and this resonance circuit；
Inductive load, connects this freewheeling circuit and IGBT；
One audion, connects this freewheeling circuit.
Further, this folding switches set includes the first switch, second switch and the first filter inductance, the second filter inductance, power cathode is sequentially connected with this first switch, the first inductance, the other end of this first inductance connects this resonance circuit one end, positive source is sequentially connected with this second switch, the second inductance, and the other end of this second inductance connects this resonance circuit other end.
Further, this resonance circuit includes an electric capacity (C) and a resistance (Ro) of series connection, the other end of this electric capacity (C) connects the other end of this first inductance, and the other end of this resistance (Ro) connects the other end of this second inductance.
Further, the other end of this electric capacity (C) and this resistance (Ro) is also connected with the two ends of this freewheeling circuit.
Further, this freewheeling circuit includes the first diode, the second diode, this first diode, the second diode anode connect this electric capacity (C), and this second diode cathode connects this resistance (Ro), and this first diode cathode connects this inductive load.
Further, this audion is IGBT.
Further, this freewheeling circuit is connected between the emitter and collector of this IGBT.
Further, the negative electrode of the first diode of this freewheeling circuit connects the colelctor electrode of this IGBT, and the negative electrode of the diode of this freewheeling circuit connects the emitter stage of this IGBT.
Further, this inductive load is equipment to be protected, is equivalent to the impedance of R+JX, and reactance X is inductance induction reactance.
Further, this inductive load one end connects the colelctor electrode of this IGBT, and even one end connects the anode of this first diode, the second diode.
Compared with prior art, a kind of perceptual Smaller load chopper for direct-flow distribution system of the present invention, load is cut off to protect circuit according to the principle of parallel resonance, for being applied in the chopper in perception Smaller load circuit, chopper designed by the present invention makes electric current zero crossing occur without increasing extra alternating current, voltage too high outside bearing rated voltage also without the extra pressure voltage improving circuit and equipment, when direct current transmission and distribution system is fast-developing, the research of this vital electrical equipment of dc circuit breaker has become focus, the perceptual Smaller load chopper of the present invention can be applicable to direct-flow distribution system, there is very strong practicality.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of the preferred embodiment of a kind of perceptual Smaller load chopper for direct-flow distribution system of the present invention；
Fig. 2 is the workflow diagram of present pre-ferred embodiments.
Detailed description of the invention
Below by way of specific instantiation accompanying drawings embodiments of the present invention, those skilled in the art can be understood further advantage and effect of the present invention easily by content disclosed in the present specification.The present invention also can pass through other different instantiation and be implemented or apply, and the every details in this specification also based on different viewpoints and application, can carry out various modification and change under the spirit without departing substantially from the present invention.
Parallel resonance refers in resistance, electric capacity, inductance in parallel circuit, exactly makes the voltage in circuit and current in phase position when the size of electric capacity, and namely power supply electric energy is all resistance consumption, becomes resistance circuit.Parallel resonance is that one compensates completely, and power supply, without providing reactive power, provides only the active power required for resistance.During resonance, the total current of circuit is minimum, and the electric current of branch road is commonly greater than the total current of circuit, and therefore, parallel resonance is also referred to as current resonance.When there is parallel resonance, inductance and capacity cell flow through very big electric current, the fuse blows of circuit can be caused or burn the accident of electrical equipment；But often it is used for selecting signal and eliminating interference in radio engineering.
Fig. 1 is the circuit structure diagram of the preferred embodiment of a kind of perceptual Smaller load chopper for direct-flow distribution system of the present invention.As it is shown in figure 1, a kind of perceptual Smaller load chopper for direct-flow distribution system of the present invention includes folding switches set 10, resonance circuit 20, freewheeling circuit 30, inductive load 40 and an audion T1.
Wherein, audion T1 adopts IGBT, and folding switches set 10 includes switch S1-S2, filter inductance L1-L2, for disconnecting Guan Bi load and filtering the burr that load produces；Resonance circuit 20 includes electric capacity C and resistance Ro, for producing and the capacitive reactances of inductive load 40 resonance；Freewheeling circuit 30 includes diode VD1-VD2, for providing current path to after audion T1 (IGBT) closes inductive load 40 and resonance circuit 20；Inductive load 40 is equipment to be protected, is equivalent to the impedance of R+JX, and reactance X is inductance induction reactance.BAT is straight-flow system power supply/battery.
Power supply BAT positive pole/negative pole is sequentially connected with switch S2/S1, one end of inductance L2/L1, the inductance L2 other end is connected to one end of resistance Ro, diode VD2 negative electrode, IGBT (T1) emitter stage (source electrode), the inductance L1 other end is connected to one end of electric capacity C, diode VD1-2 anode, one end of inductive load (R+JX), IGBT (T1) colelctor electrode (drain electrode) connects diode VD1 negative electrode, the other end of inductive load (R+JX), the other end of resistance Ro is connected with the other end of electric capacity C, IGBT (T1) base stage (grid) connects control end (not shown).
Fig. 2 is the workflow diagram of present pre-ferred embodiments, when line failure, triggering signal is utilized to make IGBT turn off, owing to the inductive current of inductive load can not be undergone mutation, continuous current circuit is formed by diode VD1, the resistance Ro and electric capacity C of resonance circuit forms continuous current circuit by diode VD2, inductance L1, L2 electric current passes through electric capacity C and resistance Ro afterflow, there is series resonance, parallel resonance is there is in inductive load with the electric capacity C in resonance circuit, major loop in circuit is made (to flow through switch S1-S2, the path of inductance L1-L2) voltage and current in phase position, power supply is provided only to the active power required for resistance Ro, dump energy in final circuit is consumed by inductive load completely, circuit major loop and load isolation, reach to cut off the purpose of inductive load.
Home switch, usually because break a band inductive load and produce partial breakdown electric discharge, for dc switch, equally exists oad freewheels problem.According to energy transfer in resonant switch technology and the principle setting up continuous current circuit, the present invention devises a kind of topological structure suitable in dc circuit breaker.When the signal of telecommunication triggers IGBT shutoff, load current passes through VD1, VD2 afterflow, forms antiresonant circuit, and the energy in circuit is totally consumed on resistance, so that electric current is zero, cuts off load.
Wherein, inductive load forms antiresonant circuit with Capacitance parallel connection in circuit.Under resonance condition, voltage and current in phase position, reactive power is zero, does not have the exchange of electric field energy or magnetic field energy between circuit and external power.Even if load has reverse impact, by the full remuneration of resonance, the total current of circuit is minimum.Active power in loop is finally zero by resistance absorption.So without improving the pressure voltage of equipment and circuit, resonance principle cuts off load in parallel, not only safety but also economically feasible.
In sum; a kind of perceptual Smaller load chopper for direct-flow distribution system of the present invention principle according to circuit resonance; rationally economically chopper designed by the present invention is used in direct-flow distribution system; and resonance principle makes circuital current be supported consumption until being zero in parallel; cut off load, reach the purpose of route protection.
Above-described embodiment is illustrative principles of the invention and effect thereof only, not for the restriction present invention.Above-described embodiment all under the spirit and category of the present invention, can carried out modifying and change by any those skilled in the art.Therefore, the scope of the present invention, should as listed by claims.
Claims (10)
1. for a perceptual Smaller load chopper for direct-flow distribution system, including:
Folding switches set, for disconnecting Guan Bi load and filtering the burr that load produces；
Resonance circuit, connects this folding switches set and freewheeling circuit, for producing and the capacitive reactances of inductive load resonance；
Freewheeling circuit, for providing current path to after IGBT closes inductive load and this resonance circuit；
Inductive load, connects this freewheeling circuit and IGBT；
One audion, connects this freewheeling circuit.
2. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 1, it is characterized in that: this folding switches set includes the first switch, second switch and the first filter inductance, the second filter inductance, power cathode is sequentially connected with this first switch, the first inductance, the other end of this first inductance connects this resonance circuit one end, positive source is sequentially connected with this second switch, the second inductance, and the other end of this second inductance connects this resonance circuit other end.
3. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 2, it is characterized in that: this resonance circuit includes an electric capacity (C) and a resistance (Ro) of series connection, the other end of this electric capacity (C) connects the other end of this first inductance, and the other end of this resistance (Ro) connects the other end of this second inductance.
4. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 3, it is characterised in that: the other end of this electric capacity (C) and this resistance (Ro) is also connected with the two ends of this freewheeling circuit.
5. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 4, it is characterized in that: this freewheeling circuit includes the first diode, the second diode, this first diode, the second diode anode connect this electric capacity (C), this second diode cathode connects this resistance (Ro), and this first diode cathode connects this inductive load.
6. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 5, it is characterised in that: this audion is IGBT.
7. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 6, it is characterised in that: this freewheeling circuit is connected between the emitter and collector of this IGBT.
8. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 7, it is characterised in that: the negative electrode of the first diode of this freewheeling circuit connects the colelctor electrode of this IGBT, and the negative electrode of the diode of this freewheeling circuit connects the emitter stage of this IGBT.
9. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 7, it is characterised in that: this inductive load is equipment to be protected, is equivalent to the impedance of R+JX, and reactance X is inductance induction reactance.
10. a kind of perceptual Smaller load chopper for direct-flow distribution system as claimed in claim 9, it is characterised in that: this inductive load one end connects the colelctor electrode of this IGBT, and even one end connects the anode of this first diode, the second diode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610237818.4A CN105743060B (en) | 2016-04-15 | 2016-04-15 | A kind of perceptual Smaller load breaker for direct-flow distribution system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610237818.4A CN105743060B (en) | 2016-04-15 | 2016-04-15 | A kind of perceptual Smaller load breaker for direct-flow distribution system |
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| CN105743060A true CN105743060A (en) | 2016-07-06 |
| CN105743060B CN105743060B (en) | 2019-05-31 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2742672Y (en) * | 2004-07-15 | 2005-11-23 | 中国人民解放军国防科学技术大学 | Soft switch changer suitable for sensitive load |
| CN101540493A (en) * | 2009-04-22 | 2009-09-23 | 南京航空航天大学 | Resonance type DC solid circuit breaker |
| WO2011044928A1 (en) * | 2009-10-13 | 2011-04-21 | Abb Research Ltd. | A hybrid circuit breaker |
| CN104882877A (en) * | 2014-02-28 | 2015-09-02 | 西门子公司 | High voltage direct current breaker |
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2016
- 2016-04-15 CN CN201610237818.4A patent/CN105743060B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2742672Y (en) * | 2004-07-15 | 2005-11-23 | 中国人民解放军国防科学技术大学 | Soft switch changer suitable for sensitive load |
| CN101540493A (en) * | 2009-04-22 | 2009-09-23 | 南京航空航天大学 | Resonance type DC solid circuit breaker |
| WO2011044928A1 (en) * | 2009-10-13 | 2011-04-21 | Abb Research Ltd. | A hybrid circuit breaker |
| CN104882877A (en) * | 2014-02-28 | 2015-09-02 | 西门子公司 | High voltage direct current breaker |
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