CN107947106A - A kind of direct current cutting system major loop topological structure - Google Patents
A kind of direct current cutting system major loop topological structure Download PDFInfo
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- CN107947106A CN107947106A CN201711206249.8A CN201711206249A CN107947106A CN 107947106 A CN107947106 A CN 107947106A CN 201711206249 A CN201711206249 A CN 201711206249A CN 107947106 A CN107947106 A CN 107947106A
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- capacitance
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- main switch
- direct current
- major loop
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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
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Abstract
The invention discloses a kind of direct current cutting system major loop topological structure, including main switch unit QF, disjunction unit, isolated location QS and buffer cell；It is in parallel with main switch unit QF after disjunction unit and isolated location QS series connection, one end of disjunction unit flows into end with the electric current of main switch unit QF and is connected, one end of isolated location QS is connected with the electric current outflow end of main switch unit QF, one end of buffer cell flows into end with the electric current of main switch unit QF and is connected, its other end is connected with the series connection end of disjunction unit and isolated location QS；Disjunction unit is made of capacitance C, controlling switch FV, inductance L and varistor RV；The present invention is substantially reduced the overvoltage on capacitance C and controlling switch FV in breaker breaking course, reduces the overall volume of breaker, the reliability for reducing comprehensive cost, improving breaking course by reducing the long-term through-flow requirement to disconnecting switch QS.
Description
Technical field
The invention belongs to electric power system fault protection technique field, and in particular to a kind of major loop of direct current cutting system is opened up
Flutter structure.
Background technology
Direct current power system is straight in ship, track traffic, mine, pulse power and industry at present because of its unique advantage
The fields such as stream power transmission and distribution have been widely used.Dc circuit breaker is always direct current as important control and protection equipment
The difficult point and focus of attention of electric system research.
Direct current breaking course mainly needs to complete three tasks：（1）Manufacture current zero-crossing point rapidly in straight-flow system, cut
Break zooming fault current；（2）Absorb the huge electromagnetic energy that inductive element stores in straight-flow system；（3）Limit electric current
During reduction because electromagnetic energy change caused by disjunction overvoltage.
For above-mentioned basic breaking course, domestic and international related researcher proposes many different direct current breaking technology sides
Case, including：Air dc circuit breaker, solid-state direct-current breaker, mixed DC breaker and artificial zero-based dc circuit breaker.
Direct current disjunction scheme based on manual zero passage technology is opened by the reverse high frequency electric that LC converter circuits provide and master
The short circuit current flow in the Central Shanxi Plain is superimposed and produces DC current zero crossing, then absorbs straight-flow system energy using varistor and limits
Overvoltage, technically simple maturation, and easily develop to high-voltage large-capacity direction, there is comprehensive advantage compared to other schemes.
Typical direct current cutting system major loop topology is as shown in Figure 1.Wherein QS is that breaker uses in systems in practice
When indispensable xegregating unit, in system worked well, it is necessary to turn on load current for a long time.Varistor RV is connected in parallel on master
QF both ends are switched, its both end voltage includes capacitance C and inductance L two parts voltages during energy-absorbing pressure limiting, on the one hand by pressure-sensitive
Resistance opens the influence of transient process, the overvoltage in breaking course on capacitance C is more than the maximum protection voltage of varistor
Value, especially when inductance L is larger（It is mH grades in high voltage DC breaker）When, the overvoltage on capacitance C dramatically increases, and causes capacitance
Volume and cost increase；On the other hand since there are larger voltage difference between capacitance C and varistor（Relative to controlling switch
FV is reverse）, the inductance L in coincidence circuit is larger, for common Triggered Vacuum Switch（With phenomenon of shutting off）, diode
（With reverse recovery phenomena）Or thyristor（With reverse recovery phenomena）Etc. controlling switch FV, can be produced during current blocking
Raw higher overvoltage, influences the reliable progress of breaking course.
The content of the invention
It is an object of the invention to insufficient according to prior art, a kind of new direct current cutting system major loop of design is opened up
Flutter, reduce breaker overall volume, the reliability for reducing comprehensive cost, improving breaking course.
The technical solution adopted by the present invention to solve the technical problems is：A kind of direct current cutting system major loop topology knot
Structure, including main switch unit QF：It is rapid in straight-flow system normal work stage long-time bearing load current, and in breaking course
Formed mechanical breaker, establish dielectric strength bear system recover voltage；Disjunction unit：By capacitance C, controlling switch FV, inductance L and
Varistor RV is formed, and forces main switch unit QF electric currents fast transfer in breaking course and zero passage blow-out, and absorb direct current
Electromagnetic energy, the limitation system overvoltage of system storage；Isolated location QS：Disconnected after straight-flow system electric current is zero without arc,
Electrical isolation is formed between system power supply and load；Buffer cell：It is in series by absorption resistance Rs and Absorption Capacitance Cs, dividing
During disconnected, relieving system recovers the climbing speed of voltage；The disjunction unit and isolated location QS series connection after with it is described
Main switch unit QF is in parallel, and one end of the disjunction unit flows into end with the electric current of main switch unit QF and is connected, described
One end of isolated location QS is connected with the electric current outflow end of main switch unit QF, one end of the buffer cell and main switch
The electric current of unit QF flows into end and is connected, its other end is connected with the series connection end of disjunction unit and isolated location QS.
Further, the capacitance C, controlling switch FV and inductance L are sequentially connected in series, and the varistor RV is connected in parallel on electricity
Hold the series circuit both ends that C and controlling switch FV is formed, the connecting pin and main switch unit of the varistor RV and capacitance C
The electric current of QF flows into end and is connected.
Further, capacitance C precharges, one end that the capacitance C is connected with varistor RV is charging voltage
Anode.
Further, the controlling switch FV is made of Triggered Vacuum Switch and Diode series.
Further, the controlling switch FV individually uses thyristor.
A kind of direct current cutting system major loop topological structure, its main switch unit QF use Fast mechanical switch.
A kind of direct current cutting system major loop topological structure, its isolated location QS are switched using mechanical isolation.
The beneficial effects of the invention are as follows：By reducing the long-term through-flow requirement to disconnecting switch QS, breaker is substantially reduced
Overvoltage in breaking course on capacitance C and controlling switch FV, reduces the overall volume of breaker, reduces comprehensive cost, improves
The reliability of breaking course.
Brief description of the drawings
Fig. 1 is existing manually zero-based direct current cutting system topological project；
Fig. 2 is the direct current cutting system major loop topological project of the present invention；
Fig. 3 is major loop topological project in specific embodiment of the invention；
Fig. 4 is the equivalent disjunction circuit of controlling switch FV in the present invention program；
The electric current that Fig. 5 is disconnecting switch QS in existing scheme and the present invention program in breaking course compares；
The electric current that Fig. 6 is capacitance C in existing scheme and the present invention program in breaking course compares；
The electric current that Fig. 7 is varistor RV in existing scheme and the present invention program in breaking course compares；
The voltage that Fig. 8 is capacitance C in existing scheme and the present invention program in breaking course compares；
The voltage that Fig. 9 is controlling switch FV in existing scheme and the present invention program in breaking course compares.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
It is topological the invention discloses a kind of direct current cutting system major loop with reference to shown in Fig. 2, including main switch unit QF,
Disjunction unit, isolated location QS and buffer cell.
Main switch unit QF：In straight-flow system normal work stage long-time bearing load current, and it is fast in breaking course
Speed formed mechanical breaker, establish dielectric strength bear system recover voltage；
Disjunction unit：Main switch unit QF electric currents fast transfer is forced in breaking course and zero passage blow-out, and absorb direct current system
Electromagnetic energy, the limitation system overvoltage of system storage；
Isolated location QS：Disconnected after straight-flow system electric current is zero without arc, electrical isolation is formed between system power supply and load；
Buffer cell：In breaking course, relieving system recovers the climbing speed of voltage.
The disjunction list in parallel, described with the main switch unit QF after the disjunction unit and isolated location QS series connection
One end of member flows into end with the electric current of main switch unit QF and is connected, one end and the main switch unit QF of the isolated location QS
Electric current outflow end be connected, one end of the buffer cell flows into end with the electric current of main switch unit QF and is connected, its is another
One end is connected with the series connection end of disjunction unit and isolated location QS.
The disjunction unit is made of capacitance C, controlling switch FV, inductance L and varistor RV, the capacitance C, control
System switch FV and inductance L is sequentially connected in series, and the varistor RV is connected in parallel on the series circuit that capacitance C and controlling switch FV is formed
The connecting pin of both ends, the varistor RV and capacitance C flow into end with the electric current of main switch unit QF and are connected.
The capacitance C precharges, one end that the capacitance C is connected with varistor RV is charging voltage anode.
The controlling switch FV is made of Triggered Vacuum Switch and Diode series or individually uses thyristor.
The buffer cell is in series by absorption resistance Rs and Absorption Capacitance Cs.
The main switch unit QF is switched using Fast mechanical switch QF, the isolated location QS using mechanical isolation
QS。
In direct current breaking course, by the voltage on the direct limiting capacitance C of varistor RV, reduce capacitance C
On overvoltage；By reducing the equivalent source voltage U in controlling switch FV disjunctions circuit0And equivalent inductance Ls, reduce control
Switch the overvoltage on FV.
The isolated location QS is only closed in direct current breaking course, only needs one section of pulse that conduction duration is shorter
Electric current.
The present invention is described in further detail with reference to embodiment.
With reference to shown in Fig. 3, controlling switch FV uses thyristor T, the capacitance C, thyristor T, inductance L and mechanical isolation
Switch QS is sequentially connected in series, and the varistor RV is connected in parallel on the series circuit both ends that capacitance C and thyristor T is formed, described
The connecting pin of varistor RV and capacitance C flow into end with the electric current of Fast mechanical switch QF and are connected, and the mechanical isolation is opened
The one end for closing QS is connected with the electric current outflow end of Fast mechanical switch QF, and the Absorption Capacitance Cs and absorption resistance Rs are formed
Series circuit, one end of the Absorption Capacitance Cs flow into end with the electric current of Fast mechanical switch QF and are connected, the absorption
One end of resistance Rs is connected with the series connection end of inductance L and mechanical isolation switch QS.
The course of work of the present invention is as follows：
In straight-flow system normal work stage, main switch unit QF Fast mechanical switch QF closures undertake the long-term work electricity of load
Stream.
After short trouble occurs for system, main switch unit QF Fast mechanical switch QF is disconnected first, when its contact reaches
It is required open away from when, thyristor T conductings, recharged capacitance C passes through thyristor T, inductance L, mechanical isolation and switchs QS and Quick mechanical
The circuit electric discharge that switch QF arc gaps are formed, the high-frequency pulse current of generation are superimposed with the short circuit current flow in Fast mechanical switch QF
Make the rapid zero passage of Fast mechanical switch QF electric currents and blow-out.
Hereafter system power is transferred to the series connection branch that capacitance C, thyristor T, inductance L and mechanical isolation switch QS are formed completely
Road, system power supply start to give C reverse chargings, and Fast mechanical switch QF both end voltages gradually increase.From Fast mechanical switch QF electricity
Flow through zero blow-out to start, buffer circuit Rs, Cs conducting, slow down the voltage increase rate at Fast mechanical switch QF both ends, improve fast
Dielectric strength restorability after fast mechanical switch QF arcs.
With the progress of capacitance C charging processes, after its both end voltage, which reaches varistor RV, opens value, RV conductings absorb
Energy, and the voltage on capacitance C is limited in its maximum protection magnitude of voltage.Hereafter system power is transferred to varistor completely
The series arm that RV, inductance L and mechanical isolation switch QS are formed.
After varistor RV is completely consumed the energy stored in straight-flow system, system power is reduced to zero, machinery every
Leave and close QS without arc disconnection, electrical isolation is formed between system power supply and load, breaking course terminates.
As can be seen that mechanical isolation switch QS only needs to turn on one section of shorter pulse current of time in breaking course, without
Load current during long-term conducting system worked well.And once the voltage on capacitance C reaches varistor RV and opens condition
Afterwards, varistor RV is limited in maximum protection magnitude of voltage immediately, and overvoltage will not be further up.With reference to shown in Fig. 4, separately
External varistor RV is turned in energy-absorbing, thyristor T procedures of turn-off, the brilliant lock being made of capacitance C, thyristor T, varistor RV
Manage in equivalent disjunction circuit, equivalent source voltage U0（Capacitance C voltage and varistor RV voltage differences）With equivalent inductance Ls（Return
Road stray inductance）It is minimum, the overvoltage as a result produced on thyristor T also very little.Therefore technical scheme can
Reduce the overall volume of breaker, the reliability for reducing comprehensive cost, improving breaking course.In breaking course, mechanical isolation is opened
The voltage closed on QS, capacitance C and electric current and capacitance C and controlling switch FV in varistor RV divides compared with the prior art
Not as shown in Fig. 5-9.
The above-described embodiments merely illustrate the principles and effects of the present invention, and the embodiment that part uses, for
For those of ordinary skill in the art, without departing from the concept of the premise of the invention, can also make it is some deformation and
Improve, these belong to protection scope of the present invention.
Claims (7)
- A kind of 1. direct current cutting system major loop topological structure, it is characterised in that：IncludingMain switch unit QF, in straight-flow system normal work stage long-time bearing load current, and the rapid shape in breaking course Into mechanical breaker, establish dielectric strength bear system recover voltage；Disjunction unit, is made of capacitance C, controlling switch FV, inductance L and varistor RV, main switch is forced in breaking course Unit QF electric currents fast transfer and zero passage blow-out, and absorb the electromagnetic energy of straight-flow system storage, limitation system overvoltage；Isolated location QS, disconnects without arc after straight-flow system electric current is zero, electrical isolation is formed between system power supply and load；Buffer cell, in series by absorption resistance Rs and Absorption Capacitance Cs, in breaking course, relieving system recovers voltage Climbing speed；The disjunction unit and isolated location QS are in parallel with the main switch unit QF after connecting, the disjunction unit One end flows into end with the electric current of main switch unit QF and is connected, one end of the isolated location QS and the electricity of main switch unit QF Stream outflow end is connected, and one end of the buffer cell flows into end with the electric current of main switch unit QF and is connected, its other end It is connected with the series connection end of disjunction unit and isolated location QS.
- A kind of 2. direct current cutting system major loop topological structure according to claim 1, it is characterised in that the capacitance C, controlling switch FV and inductance L are sequentially connected in series, and the varistor RV is connected in parallel on the series connection that capacitance C and controlling switch FV is formed The connecting pin of circuit both ends, the varistor RV and capacitance C flow into end with the electric current of main switch unit QF and are connected.
- A kind of 3. direct current cutting system major loop topological structure according to claim 2, it is characterised in that the capacitance C is precharged, and one end that the capacitance C is connected with varistor RV is charging voltage anode.
- A kind of 4. direct current cutting system major loop topological structure according to claim 2, it is characterised in that the control Switch FV is made of Triggered Vacuum Switch and Diode series.
- A kind of 5. direct current cutting system major loop topological structure according to claim 2, it is characterised in that the control Switch FV individually uses thyristor.
- 6. a kind of direct current cutting system major loop topological structure according to claim 1 or 2, it is characterised in that described Main switch unit QF uses Fast mechanical switch.
- 7. a kind of direct current cutting system major loop topological structure according to claim 1 or 2, it is characterised in that described Isolated location QS is switched using mechanical isolation.
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| CN108879620A (en) * | 2018-07-25 | 2018-11-23 | 西安交通大学 | Dc circuit breaker and its application method based on the transfer of mechanical switch arc voltage |
| CN109067160A (en) * | 2018-08-07 | 2018-12-21 | 浙江大学 | A kind of starting method of the soft-switching converter of net side precharge |
| CN111030076A (en) * | 2019-11-26 | 2020-04-17 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Bidirectional mixed medium-voltage direct-current load switch and control method thereof |
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| CN111030076A (en) * | 2019-11-26 | 2020-04-17 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Bidirectional mixed medium-voltage direct-current load switch and control method thereof |
| CN111030076B (en) * | 2019-11-26 | 2021-06-25 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Control method of bidirectional mixed medium-voltage direct-current load switch |
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| CN107947106B (en) | 2019-05-14 |
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