CN107947106B - 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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- CN107947106B CN107947106B CN201711206249.8A CN201711206249A CN107947106B CN 107947106 B CN107947106 B CN 107947106B CN 201711206249 A CN201711206249 A CN 201711206249A CN 107947106 B CN107947106 B CN 107947106B
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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 a kind of direct current cutting system major loop topological structures, 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, and the other end is connected with the series connection end of disjunction unit and isolated location QS；Disjunction unit is made of capacitor C, control switch FV, inductance L and varistor RV；The present invention is substantially reduced the overvoltage in breaker breaking course on capacitor C and control switch FV, the reliability for reducing the overall volume of breaker, reducing overall 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 fields, and in particular to a kind of major loop of direct current cutting system is opened up
Flutter structure.
Background technique
Direct current power system is straight in ship, rail 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) manufacturing current zero-crossing point rapidly in direct current system, cut
Break zooming fault current；(2) the huge electromagnetic energy of inductive element storage in direct current system is absorbed；(3) electric current is limited
Disjunction overvoltage caused by being converted when reduction because of electromagnetic energy.
For above-mentioned basic breaking course, domestic and international related researcher proposes many different direct current breaking technology sides
Case, comprising: air dc circuit breaker, solid-state direct-current breaker, mixed DC breaker and artificial zero-based dc circuit breaker.
The reversed high-frequency current that direct current disjunction scheme based on manual zero passage technology is provided by LC converter circuit is opened with master
The short circuit current in the Central Shanxi Plain is superimposed and generates DC current zero crossing, then absorbs direct current system energy using varistor and limits
Overvoltage, technically simple maturation, and be easy to 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 need that load current is connected for a long time.Varistor RV is connected in parallel on master
The both ends switch QF, its both end voltage includes capacitor C and inductance L two parts voltage during energy-absorbing pressure limiting, on the one hand by pressure-sensitive
Resistance opens the influence of transient process, and the overvoltage in breaking course on capacitor C is made to be greater than the maximum protection voltage of varistor
Value, especially when inductance L larger (being mH grades in high voltage DC breaker), the overvoltage on capacitor C is dramatically increased, and leads to capacitor
Volume and cost increase；On the other hand since there are biggish voltage differences (relative to control switch between capacitor C and varistor
FV is reversed), the inductance L in coincidence circuit is larger, for common Triggered Vacuum Switch (having phenomenon of shutting off), diode
The control switches FV such as (with reverse recovery phenomena) or thyristor (having reverse recovery phenomena), can produce during current blocking
Raw higher overvoltage, influences the reliable progress of breaking course.
Summary of the invention
It is an object of the invention to deficiencies according to prior art, design the novel direct current cutting system major loop of one kind and open up
It flutters, the reliability for reducing breaker overall volume, reducing overall 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: in direct current system normal work stage long-time bearing load current, and in breaking course rapidly
It forms mechanical breaker, establish dielectric strength receiving system recovery voltage；Disjunction unit: by capacitor C, control switch FV, inductance L and
Varistor RV is constituted, and forces main switch unit QF electric current 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: disconnecting after direct current 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 restores 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, and the other end is connected with the series connection end of disjunction unit and isolated location QS.
Further, the capacitor C, control 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 control switch FV is constituted, the connecting pin and main switch unit of the varistor RV and capacitor C
The electric current of QF flows into end and is connected.
Further, capacitor C precharge, one end that the capacitor C is connected with varistor RV are charging
Voltage cathode.
Further, the control switch FV is made of Triggered Vacuum Switch and Diode series.
Further, the control switch FV individually uses thyristor.
A kind of direct current cutting system major loop topological structure, main switch unit QF use Fast mechanical switch.
A kind of direct current cutting system major loop topological structure, isolated location QS are switched using mechanical isolation.
The beneficial effects of the present invention are: being substantially reduced breaker by reducing the long-term through-flow requirement to disconnecting switch QS
Overvoltage in breaking course on capacitor C and control switch FV reduces the overall volume of breaker, reduces overall cost, improves
The reliability of breaking course.
Detailed description of the invention
Fig. 1 is existing artificial zero-based direct current cutting system topological project；
Fig. 2 is direct current cutting system major loop topological project of the invention；
Fig. 3 is major loop topological project in specific embodiments of the present invention；
Fig. 4 is the equivalent disjunction circuit of control switch FV in the present invention program；
Fig. 5 is that the electric current of disconnecting switch QS in existing scheme and the present invention program in breaking course compares；
Fig. 6 is that the electric current of capacitor C in existing scheme and the present invention program in breaking course compares；
Fig. 7 is that the electric current of varistor RV in existing scheme and the present invention program in breaking course compares；
Fig. 8 is that the voltage of capacitor C in existing scheme and the present invention program in breaking course compares；
Fig. 9 is that the voltage of control switch FV in existing scheme and the present invention program in breaking course compares.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to shown in Fig. 2, it is topological that the invention discloses a kind of direct current cutting system major loops, including main switch unit QF,
Disjunction unit, isolated location QS and buffer cell.
Main switch unit QF: in direct current system normal work stage long-time bearing load current, and it is fast in breaking course
Speed forms mechanical breaker, establishes dielectric strength receiving system recovery voltage；
Disjunction unit: forcing main switch unit QF electric current fast transfer in breaking course and zero passage blow-out, and absorbs straight
Electromagnetic energy, the limitation system overvoltage of streaming system storage；
Isolated location QS: disconnecting after direct current system electric current is zero without arc, is formed between system power supply and load electrical
Isolation；
Buffer cell: in breaking course, relieving system restores the climbing speed of voltage.
Disjunction list in parallel with the main switch unit QF, described 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 of the isolated location QS and main switch unit QF
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, another
One end is connected with the series connection end of disjunction unit and isolated location QS.
The disjunction unit is made of capacitor C, control switch FV, inductance L and varistor RV, the capacitor 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 capacitor C and control switch FV is constituted
The connecting pin of both ends, the varistor RV and capacitor C flow into end with the electric current of main switch unit QF and are connected.
The capacitor C precharge, one end that the capacitor C is connected with varistor RV are charging voltage cathode.
The control switch FV is made of Triggered Vacuum Switch and Diode series or individually using thyristor.
The buffer cell is in series by absorption resistance Rs and Absorption Capacitance Cs.
The main switch unit QF uses Fast mechanical switch QF, the isolated location QS to switch using mechanical isolation
QS。
In direct current breaking course, by the voltage on the direct limiting capacitance C of varistor RV, reduce capacitor C
On overvoltage；By reducing the equivalent source voltage U in control switch FV disjunction circuit0And equivalent inductance Ls, reduce control
Overvoltage on switch 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.
Below with reference to embodiment, invention is further described in detail.
Referring to shown in Fig. 3, control switch FV uses thyristor T, the capacitor 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 capacitor C and thyristor T is constituted, described
The connecting pin of varistor RV and capacitor 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 constituted
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 direct current system normal work stage, main switch unit QF Fast mechanical switch QF is closed the permanent worker for undertaking load
Make electric current.
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 conducting, recharged capacitance C pass through thyristor T, inductance L, mechanical isolation switch QS and Quick mechanical
The circuit electric discharge that switch QF arc gap is constituted, the high-frequency pulse current of generation are superimposed with the short circuit current in Fast mechanical switch QF
Make the rapid zero passage of Fast mechanical switch QF electric current and blow-out.
Hereafter system power is transferred to the series connection branch that capacitor C, thyristor T, inductance L and mechanical isolation switch QS are constituted completely
Road, system power supply start to give C reverse charging, and Fast mechanical switch QF both end voltage is gradually increased.From Fast mechanical switch QF electricity
It flows through zero blow-out to start, buffer circuit Rs, Cs conducting slow down the voltage increase rate at the both ends Fast mechanical switch QF, improve fast
Dielectric strength restorability after fast mechanical switch QF arc.
With the progress of capacitor C charging process, after its both end voltage, which reaches varistor RV, opens value, RV conducting absorbs
Energy, and the voltage on capacitor C is limited in its maximum protection voltage value.Hereafter system power is transferred to varistor completely
The series arm that RV, inductance L and mechanical isolation switch QS are constituted.
After varistor RV is completely consumed the energy stored in direct current system, system power is reduced to zero, it is mechanical every
It leaves and closes QS without arc disconnection, form electrical isolation between system power supply and load, breaking course terminates.
As can be seen that mechanical isolation switch QS only needs to be connected one section of shorter pulse current of time in breaking course, it is not necessarily to
Load current when long-term conducting system worked well.Once and the voltage on capacitor C reaches varistor RV and opens condition
Afterwards, varistor RV is limited in maximum protection voltage value immediately, and overvoltage will not be further up.Referring to shown in Fig. 4, separately
In external varistor RV conducting energy-absorbing, thyristor T procedures of turn-off, the brilliant lock that is made of capacitor C, thyristor T, varistor RV
It manages in equivalent disjunction circuit, equivalent source voltage U0(capacitor C voltage and varistor RV voltage difference) and equivalent inductance Ls(are returned
Road stray inductance) minimum, the overvoltage as a result generated on thyristor T also very little.Therefore technical solution of the present invention can
The reliability for reducing the overall volume of breaker, reducing overall cost, improving breaking course.In breaking course, mechanical isolation is opened
The voltage closed on QS, capacitor C and electric current and capacitor C and control 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 skilled in the art, without departing from the concept of the premise of the invention, can also make it is several deformation and
It improves, these are all within the scope of protection of the present invention.
Claims (6)
1. a kind of direct current cutting system major loop topological structure, it is characterised in that: including
Main switch unit QF, in direct current system normal work stage long-time bearing load current, and the rapid shape in breaking course
At mechanical breaker, establish dielectric strength receiving system recovery voltage；
Disjunction unit is made of capacitor C, control switch FV, inductance L and varistor RV, main switch is forced in breaking course
Unit QF electric current fast transfer and zero passage blow-out, and absorb the electromagnetic energy of direct current system storage, limitation system overvoltage；It is described
Capacitor C, control switch FV and inductance L be sequentially connected in series, the varistor RV is connected in parallel on capacitor C and control switch FV and constitutes
Series circuit both ends, the connecting pin of the varistor RV and capacitor C flow into end with the electric current of main switch unit QF and are connected
It connects；
Isolated location QS disconnects without arc after direct current system electric current is zero, forms electrical isolation between system power supply and load；
Buffer cell, in series by absorption resistance Rs and Absorption Capacitance Cs, in breaking course, relieving system restores 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, the other end
It is connected with the series connection end of disjunction unit and isolated location QS.
2. a kind of direct current cutting system major loop topological structure according to claim 1, which is characterized in that the capacitor
C precharge, one end that the capacitor C is connected with varistor RV are charging voltage cathode.
3. a kind of direct current cutting system major loop topological structure according to claim 1, which is characterized in that the control
Switch FV is made of Triggered Vacuum Switch and Diode series.
4. a kind of direct current cutting system major loop topological structure according to claim 1, which is characterized in that the control
Switch FV individually uses thyristor.
5. a kind of direct current cutting system major loop topological structure according to claim 1, which is characterized in that the master opens
It closes unit QF and uses Fast mechanical switch.
6. a kind of direct current cutting system major loop topological structure according to claim 1, which is characterized in that the isolation
Unit QS is switched using mechanical isolation.
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| CN109067160B (en) * | 2018-08-07 | 2020-11-13 | 浙江大学 | Starting method of soft switching converter with network side pre-charging function |
| 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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|---|---|---|---|---|
| CN106300291A (en) * | 2016-08-27 | 2017-01-04 | 天津大学 | Hybrid high voltage DC breaker based on IGBT |
| CN106877301A (en) * | 2017-04-14 | 2017-06-20 | 贵州电网有限责任公司 | A kind of high voltage DC breaker and test method |
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| JP4641287B2 (en) * | 2006-06-22 | 2011-03-02 | 株式会社日立製作所 | Commutation type DC circuit breaker |
| EP2523204B1 (en) * | 2011-05-12 | 2019-09-04 | ABB Schweiz AG | Circuit arrangement and method for interrupting a current flow in a DC current path |
| CN104779593B (en) * | 2015-04-22 | 2017-10-20 | 中国船舶重工集团公司第七一二研究所 | A kind of DC solid circuit breaker and its control method |
| CN107171279A (en) * | 2017-06-05 | 2017-09-15 | 国家电网公司 | A kind of mixed type dc circuit breaker and its method for dividing |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300291A (en) * | 2016-08-27 | 2017-01-04 | 天津大学 | Hybrid high voltage DC breaker based on IGBT |
| CN106877301A (en) * | 2017-04-14 | 2017-06-20 | 贵州电网有限责任公司 | A kind of high voltage DC breaker and test method |
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