CN103618281A - Hybrid type bidirectional full-load direct current cut-off device and cut-off method based on manual zero passage technology - Google Patents
Hybrid type bidirectional full-load direct current cut-off device and cut-off method based on manual zero passage technology Download PDFInfo
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- CN103618281A CN103618281A CN201310549450.1A CN201310549450A CN103618281A CN 103618281 A CN103618281 A CN 103618281A CN 201310549450 A CN201310549450 A CN 201310549450A CN 103618281 A CN103618281 A CN 103618281A
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Abstract
The invention provides a hybrid type bidirectional full-load direct current cut-off device and cut-off method based on the manual zero passage technology. A current conversion switch composed of full-control power electronic devices and semi-control power electronic devices can forcibly cut off a small current flowing through current conversion branches, the capacity of cutting off a small-load current is added on the basis that the cut-off device can cut off a system short-circuit current and a large-load current, and the full-load cutting off of the cut-off device is achieved. The two sets of current conversion branches are connected to the two ends of a main cut-off port in parallel, currents in two directions can be cut off respectively, and bidirectional cutting off of direct currents is achieved. Current conversion capacitors and charging resistors form two charging branches, and the two current conversion capacitors can be conveniently and reliably charged through a bus. Discharging branches of the current conversion capacitors are composed of the semi-control power electronic device and resistors, the current conversion capacitors can be discharged rapidly after the cutting off process is finished, and loads and a system are protected.
Description
Technical field
The direct current the present invention relates in power industry cut-offs technical field, is specifically related to a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology and cut-offs method.
Background technology
Compare with alternating current, direct current is owing to not having natural zero-crossing point to be difficult to cut-off.It is by artificial generation current, to make its method of cut-offfing zero point, the change of current branch road that the converting capacitor C by precharge, a converter reactor L in parallel and commutation switch S form at main circuit breaker MCB two ends that direct current based on artificial zero passage cut-offs.While cut-offfing, open main circuit breaker, between its electrode, form electric arc, closed commutation switch now, converting capacitor forms discharge loop by converter reactor and main circuit breaker electric arc, produce reversing oscillating current i, and be superimposed upon on main circuit breaker arc current I, make its arc current form " artificial zero crossing " and extinguish, after main circuit breaker arc extinction, current transfer is to change of current branch road, to commutation capacitor reverse charging, now main fracture both end voltage changes along with the variation of commutation capacitor voltage, as drop into reverse current constantly system power more main fracture both end voltage will be increased to rapidly lightning arrestor movement voltage, lightning arrestor movement, absorb energy, final completion system electric current cut-offs.
The direct current of having introduced in a kind of trailer system in document < < new type of DC vacuum circuit breaker for locomotives > > cut-offs technology, when dropping into reverse current, commutation circuit controls with mechanical switch, and the change of current branch road that only has a direction, can not solve the two-way problem of cut-offfing.
The direct current of having introduced in a kind of trailer system in document < < The Basic Investigation of the High-speed VCB and Its application for the DC Power System > > cut-offs technology, by half control type power electronic device, do commutation switch and drop into reverse current, when cut-offfing less load current, change of current branch road will flow through the little electric current of slow-decay, because half control type power electronic device can not be turn-offed the little electric current that flows through it, so at system loading electric current hour, the technology of introducing in document can not successfully be cut-off circuit.
In the research > > of document < < 1500V circuit breaker peculiar to vessel, introduced a kind of DC circuit breaker of novel unit structure simultaneous operation, its commutation capacitor 1500V voltage of need substituting the bad for the good in advance, the charging modes of commutation capacitor is more loaded down with trivial details.
In addition, all do not consider the electric discharge problem of commutation capacitor in prior art, when cut-offfing load current, commutation capacitor need to pass through load discharge, and discharge time is longer, easily load is damaged.
Summary of the invention
The object of the present invention is to provide a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology and cut-off method.
For achieving the above object, the present invention has adopted following technical scheme.
A kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology, this device comprises main circuit breaker and first change of current branch road and second change of current branch road in parallel with main circuit breaker respectively, described the first change of current branch road comprises the first converting capacitor of series connection, the first converter reactor and the first commutation switch, the second change of current branch road comprises the second converting capacitor of series connection, the second converter reactor and the second commutation switch, the first commutation switch is comprised of the first all-controlling power electronics device and the first half control type power electronic device of parallel connection, the second commutation switch is comprised of the second all-controlling power electronics device and the second half control type power electronic device of parallel connection.
The reverse current opposite direction that described the first change of current branch road and the second change of current branch road drop into.
Described device also comprises the first charging paths and the second charging paths, the first charging paths comprises the first charging resistor, one end ground connection of the first charging resistor, the other end is connected to the first converting capacitor one side, the opposite side of the first converting capacitor is directly connected with bus, and the second charging paths comprises the second charging resistor, one end ground connection of the second charging resistor, the other end is connected to the second converting capacitor one side, and the opposite side of the second converting capacitor is directly connected with bus.
Described device also comprises the first converting capacitor discharge paths and the second converting capacitor discharge paths, the first converting capacitor discharge paths comprises the 3rd half control type power electronic device, the 4th half control type power electronic device, the first resistance and the second resistance, the branch road A being in series with the first resistance by the 3rd half control type power electronic device and the branch road B being in series with the second resistance by the 4th half control type power electronic device are in parallel with the first converting capacitor respectively, the second converting capacitor discharge paths comprises the 5th half control type power electronic device, the 6th half control type power electronic device, the 3rd resistance and the 4th resistance, the branch road C being in series with the 3rd resistance by the 5th half control type power electronic device and the branch road D being in series with the 4th resistance by the 6th half control type power electronic device are in parallel with the second converting capacitor respectively.
Described device also comprises the lightning arrester in parallel with main circuit breaker.
Described device also comprises central control unit, described central control unit respectively with main circuit breaker, the first all-controlling power electronics device, the first half control type power electronic device, the second all-controlling power electronics device, the second half control type power electronic device, the 3rd half control type power electronic device, the 4th half control type power electronic device, the 5th half control type power electronic device, the 6th half control type power electronic device, be arranged at the current sensor on bus, for detection of the transducer of lightning arrester electric current and for detection of first, the transducer of the second change of current branch current is connected.
The above-mentioned hybrid two-way full load direct current breaking device based on artificial zero passage technology cut-off method, comprise the following steps:
Step 1: when system is normally moved, the first half control type power electronic device, the second half control type power electronic device, the first all-controlling power electronics device and the second all-controlling power electronics device are in off-state, the 3rd half control type power electronic device, the 4th half control type power electronic device, the 5th half control type power electronic device and the 6th half control type power electronic device are in off-state, main circuit breaker is closed, system is to load normal power supply, by the first charging resistor and the second charging resistor, charge to the first converting capacitor and the second converting capacitor simultaneously,
Step 2: situation one: if system is short-circuited, central control unit is confirmed to make main circuit breaker separating brake after short circuit occurs according to the main circuit breaker size of current of monitoring and direction, and make the first half control type power electronic device or the corresponding conducting of the second half control type power electronic device according to the main circuit breaker sense of current, drop into reverse current; Or situation two: if cut-off load current, central control unit makes the first all-controlling power electronics device or the corresponding conducting of the second all-controlling power electronics device according to the main circuit breaker sense of current, drops into reverse current; In aforementioned two kinds of situations, drop into after reverse current, when main circuit breaker arc current zero passage, commutation course finishes, and main circuit breaker disconnects;
Step 3: main circuit breaker forms new loop by corresponding change of current branch road between system power supply and load after disconnecting, and electric current is transferred to corresponding change of current branch road completely, now has two kinds of situations:
Situation is 1.: if new loop in underdamping state, when cut-offfing short circuit current, new loop current vibration zero passage constantly the first half control type power electronic device or the second half control type power electronic device automatically shut down, complete whole interrupting process; When cut-offfing in load current situation, after new loop current vibration zero passage, central control unit is given the first all-controlling power electronics device or the second all-controlling power electronics device cut-off signals, the first all-controlling power electronics device or the second all-controlling power electronics device reliable turn-off, complete whole interrupting process;
Situation is 2.: if new loop is in overdamping state, when central control unit monitors new loop current and is less than predetermined value, to the first all-controlling power electronics device or the second all-controlling power electronics device, send cut-off signals commutation switch is turn-offed, complete interrupting process;
Step 4: after interrupting process completes, central control unit is given the 3rd half control type power electronic device and the 4th half control type power electronic device Continuity signal, the first converting capacitor electric discharge, or, after interrupting process completes, central control unit is given the 5th half control type power electronic device and the 6th half control type power electronic device Continuity signal, the second converting capacitor electric discharge.
The situation of described step 3 1. in, if main circuit breaker both end voltage is greater than lightning arrestor movement voltage, lightning arrester conducting, makes new loop current zero passage, after lightning arrester electric current reduces to zero, completes interrupting process.
Beneficial effect of the present invention is embodied in:
1) adopt two cover commutation circuits to cut-off respectively the electric current of both direction, realized bidirectional, dc and cut-off, and controlled convenient and reliable.
2) when cut-offfing less load current, after commutation course, electric current is transferred to change of current branch road completely, and after process in be connected in parallel on the Analyse of Reject-acting Arrester at main fracture two ends, the new loop now forming is in overdamping state, the electric current that new loop stream is crossed does not have zero crossing, and the mechanical switch adopting in existing technology or half control type power electronic device can not be cut-off new loop, cause prior art failure of interruption when cut-offfing less load current.The present invention is when cut-offfing less load current, adopt all-controlling power electronics device to drop into reverse current, after commutation course finishes and when new loop current is down to set point, to all-controlling power electronics device cut-off signals, be forced shutdown new current circuit, successfully cut-off the electric current that flows through new loop, complete whole interrupting process.
3) directly by system busbar, to the converting capacitor in two commutation circuits, charge, can keep the stable of commutation capacitor voltage, thereby guarantee the reverse current peak value needing when cut-offfing short circuit current, both met two-way requirement of cut-offfing, also save additional charging circuit, increased the reliability of breaking device simultaneously.
4) by the two-way controlled discharge paths in parallel at commutation capacitor two ends; realized the function of the two-way repid discharge of commutation capacitor; in existing technology; while cut-offfing load current; do not consider the electric discharge problem of commutation capacitor; commutation capacitor will pass through load discharge; and discharge time is longer; to produce infringement to load and system; the present invention in the parallel connection of commutation capacitor two ends two-way controlled discharge paths, after whole interrupting process completes, to commutation capacitor repid discharge; protect direct current system and load, be convenient to commutation capacitor charging next time simultaneously.
Accompanying drawing explanation
Fig. 1 is that the existing direct current based on artificial zero passage method cut-offs schematic diagram;
Fig. 2 is the schematic diagram of device of the present invention;
Fig. 3 is the simulation result of the present invention while cut-offfing short circuit current;
Fig. 4 is the simulation result of the present invention while cut-offfing little load current;
Fig. 5 is commutation capacitor charging process;
Fig. 6 is commutation capacitor discharge process;
In figure: MCB represents that main circuit breaker, MOV represent that lightning arrester, I represent that main circuit breaker arc current, i represent that reversing oscillating current, S represent that commutation switch, L represent that converter reactor, C represent converting capacitor, C
1represent the first converting capacitor, L
1represent the first converter reactor, I
1represent the first all-controlling power electronics device, T
1represent the first half control type power electronic device, R
1represent the first charging resistor, S
1+ represent the 3rd half control type power electronic device, S
1-represent the 4th half control type power electronic device, R
1+ represent the first resistance, R
1-represent the second resistance, C
2represent the second converting capacitor, L
2represent the second converter reactor, I
2represent the second all-controlling power electronics device, T
2represent the second half control type power electronic device, R
2represent the second charging resistor, S
2+ represent the 5th half control type power electronic device, S
2-represent the 6th half control type power electronic device, R
2+ represent the 3rd resistance, R
2-represent that the 4th resistance, I+, I-represent main circuit breaker electric current, I+ and I-opposite direction.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
The present invention cut-offs and the two-way problem of cut-offfing in order to solve little electric current, proposed a kind of hybrid two-way full load direct current based on artificial zero passage technology and cut-off method, while the method has also solved bidirectional, dc and has cut-off middle converting capacitor charging problem and converting capacitor electric discharge problem.
The present invention mainly contains four key points:
1) utilize half control type and all-controlling power electronics device formation in parallel commutation switch, bear respectively the task of cut-offfing of short circuit current and load current; 2) adopt two cover commutation circuits, bear separately the task of cut-offfing of a direction; 3) directly by system busbar, to the converting capacitor in two commutation circuits, charge; 4) the two-way controlled discharge paths in parallel at commutation capacitor two ends.
Particular content of the present invention is as follows:
As shown in Figure 2, the direct current breaking device that the present invention adopts consists of six parts:
1. main circuit breaker MCB;
2. by the first all-controlling power electronics device I
1with the first half control type power electronic device T
1form the first commutation switch, by the first converting capacitor C
1, the first converter reactor L
1the first change of current branch road with the first commutation switch formation; By the second all-controlling power electronics device I
2with the second half control type power electronic device T
2form the second commutation switch, by the second converting capacitor C
2, the second converter reactor L
2form and reciprocal the second change of current branch road of the first change of current branch road with the second commutation switch;
3. by the first converting capacitor C
1, the first charging resistor R
1the first charging paths forming, by the second converting capacitor C
2, the second charging resistor R
2the second charging paths forming; The first charging resistor R
1one end ground connection, the other end is connected to the first converting capacitor C
1one side, the first converting capacitor C
1opposite side be directly connected with bus, the second charging resistor R
2one end ground connection, the other end is connected to the second converting capacitor C
2one side, the second converting capacitor C
2opposite side be directly connected with bus.
4. lightning arrester MOV;
5. by the 3rd half control type power electronic device S
1+ (the 4th half control type power electronic device S
1-) and the first resistance R
1+ (the second resistance R
1-) the first converting capacitor discharge paths of forming, by the 5th half control type power electronic device S
2+ (the 6th half control type power electronic device S
2-) and the 3rd resistance R
2+ (the 4th resistance R
2-) the second converting capacitor discharge paths of forming; By the 3rd half control type power electronic device S
1+ with the first resistance R
1+ branch road the A that is in series and by the 4th half control type power electronic device S
1-with the second resistance R
1-branch road the B that is in series respectively with the first converting capacitor C
1in parallel; By the 5th half control type power electronic device S
2+ with the 3rd resistance R
2+ branch road the C that is in series and by the 6th half control type power electronic device S
2-with the 4th resistance R
2-branch road the D that is in series respectively with the second converting capacitor C
2in parallel.
6. central control unit, central control unit is connected with above-mentioned half control type, all-controlling power electronics device and current sensor.
Central control unit can adopt for example MSP430 microprocessor, and half control type power electronic device can adopt for example thyristor, and all-controlling power electronics device can adopt for example IGCT.
In actual conditions, current direction may be I+ and I-both direction (see figure 2), and whole interrupting process is divided into four steps:
Step 1: system is normally moved, the first half control type power electronic device T
1(the second half control type power electronic device T
2) and the first all-controlling power electronics device I
1(the second all-controlling power electronics device I
2) in off-state, change of current branch current is 0, the three half control type power electronic device S
1+ (the 4th half control type power electronic device S
2+) and the 5th half control type power electronic device S
1-(the 6th half control type power electronic device S
2-) in off-state, main circuit breaker MCB is closed, system is to load normal power supply, simultaneously by the first charging resistor R
1with the second charging resistor R
2give respectively two converting capacitor chargings;
Step 2: if system is short-circuited, central control unit is confirmed to make main circuit breaker separating brake after short circuit occurs according to monitored size of current and direction, when electric current is I+, makes the first half control type power electronic device T
1conducting, drops into reverse current, when electric current is I-, makes the second half control type power electronic device T
2conducting, drops into reverse current; If what cut-off is load current, central control unit makes main circuit breaker separating brake according to the separating brake instruction receiving, and when central control unit monitoring current is I+, makes the first all-controlling power electronics device I
1conducting, drops into reverse current, when central control unit monitoring current is I-, makes the second all-controlling power electronics device I
2conducting, drops into reverse current.When main circuit breaker arc current forces zero passage, commutation course finishes, and main circuit breaker disconnects;
Step 3: main circuit breaker MCB forms new loop by corresponding change of current branch road between system power supply and load after disconnecting, and electric current is transferred to change of current branch road completely, now has two kinds of situations:
1. when new loop is in underdamping state, when cut-offfing short circuit current, the loop current zero passage of can vibrating, at zero passage commutation switch (the first half control type power electronic device T constantly
1or the second half control type power electronic device T
2) automatically shut down, complete whole interrupting process; When cut-offfing in load current situation, after new loop current vibration zero passage, (electric current that flows through commutation switch is 0) central control unit is given the first all-controlling power electronics device I
1or the second all-controlling power electronics device I
2cut-off signals, all-controlling power electronics device reliable turn-off, completes whole interrupting process.If main fracture both end voltage is greater than lightning arrestor movement voltage, lightning arrester conducting also can make commutation circuit current over-zero, after lightning arrester electric current reduces to zero, completes interrupting process, and example as shown in Figure 3.
2. when new loop is in overdamping state, loop current is by constantly decay (rate of decay is relevant with line parameter circuit value), when central control unit monitors new loop current and is less than predetermined value, to commutation switch, (this is the first all-controlling power electronics device I to central control unit
1or the second all-controlling power electronics device I
2) send cut-off signals commutation switch is turn-offed, completing interrupting process, example is as shown in Figure 4.This situation is exactly that the load current realized of the present invention cut-offs method when very little.
Step 4: the electric current that central control unit monitoring stream is crossed commutation switch and lightning arrester is at 0 o'clock, judgement interrupting process completes.Then, when breaking device drop-out current is I+, central control unit is given the 3rd half control type power electronic device S
1+ and the 4th half control type power electronic device S
1-Continuity signal, the first converting capacitor C
1by discharge paths, discharge, or when breaking device drop-out current is I-, central control unit is given the 5th half control type power electronic device S
2+ and the 6th half control type power electronic device S
2-Continuity signal, the second converting capacitor C
2by discharge paths, discharge, realize the repid discharge of converting capacitor, protection system and load.
Referring to Fig. 3, when direct current breaking device cut-offs short circuit current, select the half control type power electronic device in commutation switch to drop into reverse current.
Referring to Fig. 4, direct current breaking device, when cut-offfing load current, selects the all-controlling power electronics device in commutation switch to drop into reverse current, and current transfer is to change of current branch road, change of current branch current can not zero passage, is forced shutdown change of current branch road to all-controlling power electronics device cut-off signals.
Referring to Fig. 5, initial time commutation capacitor voltage is 0, and through certain hour (can regulate by changing charging resistor resistance), commutation capacitor voltage approaches busbar voltage.
Referring to Fig. 6, cut-off after short circuit current, if there is no discharge paths, commutation capacitor will discharge by short dot and discharge resistance, and as shown in solid line in figure, the velocity of discharge is slow, if commutation capacitor two ends parallel discharge branch road, after interrupting process completes, commutation capacitor can discharge by discharge paths, and as shown in figure orbicular spot line, the velocity of discharge is very fast.This is mainly that charging resistor is more much larger than discharge paths resistance due under actual conditions.
In the present invention:
1) commutation switch being comprised of all-controlling power electronics device and half control type power electronic device can be forced shutdown the little electric current that flows through change of current branch road, at breaking device, can cut-off on the basis of system short-circuit electric current and large load current, increased the ability of cut-offfing little load current, realized the full load of breaking device and cut-off; 2) in the two ends parallel connection of main fracture above-mentioned two cover change of current branch roads, can cut-off respectively the electric current of both direction, realized bidirectional, dc and cut-off; 3) by commutation capacitor, charging resistor, form two charging paths, can charge to respectively two commutation capacitors by bus, convenient and reliable; 4) by half control type power electronic device and resistance, formed the discharge paths of commutation capacitor, can be fast to change of current capacitor discharge after interrupting process finishes, protection load and system.
Claims (8)
1. the hybrid two-way full load direct current breaking device based on artificial zero passage technology, it is characterized in that: this device comprises main circuit breaker (MCB) and first change of current branch road and second change of current branch road in parallel with main circuit breaker (MCB) respectively, and described the first change of current branch road comprises the first converting capacitor (C of series connection
1), the first converter reactor (L
1) and the first commutation switch, the second change of current branch road comprises the second converting capacitor (C of series connection
2), the second converter reactor (L
2) and the second commutation switch, the first commutation switch is by the first all-controlling power electronics device (I of parallel connection
1) and the first half control type power electronic device (T
1) form, the second commutation switch is by the second all-controlling power electronics device (I of parallel connection
2) and the second half control type power electronic device (T
2) form.
2. a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology according to claim 1, is characterized in that: the reverse current opposite direction that described the first change of current branch road and the second change of current branch road drop into.
3. a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology according to claim 1, is characterized in that: described device also comprises the first charging paths and the second charging paths, and the first charging paths comprises the first charging resistor (R
1), the first charging resistor (R
1) one end ground connection, the other end is connected to the first converting capacitor (C
1) side, the first converting capacitor (C
1) opposite side be directly connected with bus, the second charging paths comprises the second charging resistor (R
2), the second charging resistor (R
2) one end ground connection, the other end is connected to the second converting capacitor (C
2) side, the second converting capacitor (C
2) opposite side be directly connected with bus.
4. a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology according to claim 1, it is characterized in that: described device also comprises the first converting capacitor discharge paths and the second converting capacitor discharge paths, the first converting capacitor discharge paths comprises the 3rd half control type power electronic device (S
1+), the 4th half control type power electronic device (S
1-), the first resistance (R
1+) and the second resistance (R
1-), by the 3rd half control type power electronic device (S
1+) and the first resistance (R
1+) the branch road A that is in series and by the 4th half control type power electronic device (S
1-) and the second resistance (R
1-) the branch road B that is in series respectively with the first converting capacitor (C
1) parallel connection, the second converting capacitor discharge paths comprises the 5th half control type power electronic device (S
2+), the 6th half control type power electronic device (S
2-), the 3rd resistance (R
2+) and the 4th resistance (R
2-), by the 5th half control type power electronic device (S
2+) and the 3rd resistance (R
2+) the branch road C that is in series and by the 6th half control type power electronic device (S
2-) and the 4th resistance (R
2-) the branch road D that is in series respectively with the second converting capacitor (C
2) parallel connection.
5. a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology according to claim 1, is characterized in that: described device also comprises the lightning arrester (MOV) in parallel with main circuit breaker (MCB).
6. a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology according to claim 1, it is characterized in that: described device also comprises central control unit, described central control unit respectively with main circuit breaker (MCB), the first all-controlling power electronics device (I
1), the first half control type power electronic device (T
1), the second all-controlling power electronics device (I
2), the second half control type power electronic device (T
2), the 3rd half control type power electronic device (S
1+), the 4th half control type power electronic device (S
1-), the 5th half control type power electronic device (S
2+) and the 6th half control type power electronic device (S
2-) be connected.
As claimed in claim 1 the hybrid two-way full load direct current breaking device based on artificial zero passage technology cut-off a method, it is characterized in that: comprise the following steps:
Step 1: when system is normally moved, the first half control type power electronic device (T
1), the second half control type power electronic device (T
2), the first all-controlling power electronics device (I
1) and the second all-controlling power electronics device (I
2) in off-state, the 3rd half control type power electronic device (S
1+), the 4th half control type power electronic device (S
1-), the 5th half control type power electronic device (S
2+) and the 6th half control type power electronic device (S
2-) in off-state, main circuit breaker (MCB) closure, system is to load normal power supply, simultaneously by the first charging resistor (R
1) and the second charging resistor (R
2) to the first converting capacitor (C
1) and the second converting capacitor (C
2) charging;
Step 2: situation one: if system is short-circuited, central control unit is confirmed to make main circuit breaker (MCB) separating brake after short circuit occurs according to the main circuit breaker size of current of monitoring and direction, and makes the first half control type power electronic device (T according to the main circuit breaker sense of current
1) or the second half control type power electronic device (T
2) corresponding conducting, drop into reverse current; Or situation two: if cut-off load current, central control unit makes the first all-controlling power electronics device (I according to the main circuit breaker sense of current
1) or the second all-controlling power electronics device (I
2) corresponding conducting, drop into reverse current; In aforementioned two kinds of situations, drop into after reverse current, when main circuit breaker (MCB) arc current zero passage, commutation course finishes, and main circuit breaker (MCB) disconnects;
Step 3: main circuit breaker (MCB) forms new loop by corresponding change of current branch road between system power supply and load after disconnecting, and electric current is transferred to corresponding change of current branch road completely, now has two kinds of situations:
If 1. new loop is in underdamping state, when cut-offfing short circuit current, at the new loop current vibration zero passage moment the first half control type power electronic device (T
1) or the second half control type power electronic device (T
2) automatically shut down, complete whole interrupting process; When cut-offfing in load current situation, after new loop current vibration zero passage, central control unit is given the first all-controlling power electronics device (I
1) or the second all-controlling power electronics device (I
2) cut-off signals, the first all-controlling power electronics device (I
1) or the second all-controlling power electronics device (I
2) reliable turn-off, complete whole interrupting process;
If 2. new loop is in overdamping state, when central control unit monitors new loop current and is less than predetermined value, to the first all-controlling power electronics device (I
1) or the second all-controlling power electronics device (I
2) send cut-off signals commutation switch is turn-offed, complete interrupting process;
Step 4: after interrupting process completes, central control unit is given the 3rd half control type power electronic device (S
1+) and the 4th half control type power electronic device (S
1-) Continuity signal, the first converting capacitor (C
1) electric discharge, or after interrupting process completes, central control unit is given the 5th half control type power electronic device (S
2+) and the 6th half control type power electronic device (S
2-) Continuity signal, the second converting capacitor (C
2) electric discharge.
According to claim 7 a kind of hybrid two-way full load direct current breaking device based on artificial zero passage technology cut-off method, it is characterized in that: the situation of described step 3 1. in, if main circuit breaker (MCB) both end voltage is greater than lightning arrester (MOV) operation voltage, lightning arrester (MOV) conducting, make new loop current zero passage, after lightning arrester (MOV) electric current reduces to zero, complete interrupting process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310549450.1A CN103618281B (en) | 2013-11-07 | 2013-11-07 | Hybrid two-way full load direct current on-off device and cutoff method thereof based on manual zero passage technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310549450.1A CN103618281B (en) | 2013-11-07 | 2013-11-07 | Hybrid two-way full load direct current on-off device and cutoff method thereof based on manual zero passage technology |
Publications (2)
| Publication Number | Publication Date |
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| CN103618281A true CN103618281A (en) | 2014-03-05 |
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Cited By (4)
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| CN108711832A (en) * | 2018-06-28 | 2018-10-26 | 河南森源电气股份有限公司 | A kind of low-voltage direct breaker |
| CN109274076A (en) * | 2018-08-23 | 2019-01-25 | 国家电网有限公司 | A kind of current-injection type dc circuit breaker |
| CN109980617A (en) * | 2019-04-04 | 2019-07-05 | 国网冀北电力有限公司电力科学研究院 | The electric current Interruption performance of current-injecting dc circuit breaker optimizes circuit |
| CN110941935A (en) * | 2019-11-01 | 2020-03-31 | 国网宁夏电力有限公司电力科学研究院 | Simulation method and system for electric arc of double-break circuit breaker |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108711832A (en) * | 2018-06-28 | 2018-10-26 | 河南森源电气股份有限公司 | A kind of low-voltage direct breaker |
| CN109274076A (en) * | 2018-08-23 | 2019-01-25 | 国家电网有限公司 | A kind of current-injection type dc circuit breaker |
| CN109980617A (en) * | 2019-04-04 | 2019-07-05 | 国网冀北电力有限公司电力科学研究院 | The electric current Interruption performance of current-injecting dc circuit breaker optimizes circuit |
| CN110941935A (en) * | 2019-11-01 | 2020-03-31 | 国网宁夏电力有限公司电力科学研究院 | Simulation method and system for electric arc of double-break circuit breaker |
| CN110941935B (en) * | 2019-11-01 | 2023-06-23 | 国网宁夏电力有限公司电力科学研究院 | Simulation method and system for arc of double-break circuit breaker |
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