CN103117528A - Series capacitor type high-voltage direct current breaker and control method thereof - Google Patents
Series capacitor type high-voltage direct current breaker and control method thereof Download PDFInfo
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- CN103117528A CN103117528A CN2013100180033A CN201310018003A CN103117528A CN 103117528 A CN103117528 A CN 103117528A CN 2013100180033 A CN2013100180033 A CN 2013100180033A CN 201310018003 A CN201310018003 A CN 201310018003A CN 103117528 A CN103117528 A CN 103117528A
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Abstract
The invention relates to a series capacitor type high-voltage direct current breaker and a control method thereof. The breaker comprises direct current breaker units which are connected in series, and each direct current breaker unit comprises a change-over switch, a switching circuit and an energy consumption device which are connected in parallel. The change-over switch adopts a mechanical switch, and the switching circuit adopts a resistance capacitance branch circuit, and the energy consumption device adopts a lightning arrester. The high-voltage direct current breaker is connected with a control circuit, and the mechanical switch detects failure current and acts at the T1moment, and transfers the failure current into the resistance capacitance branch circuit. The failure current charges a capacitor, and controls switching-on and switching-off of the mechanical switch. Before the mechanical switch witches off at the T2 moment, charging voltage on two ends of the capacitor throughout is lower than arcing voltage at fractures of the mechanical switch. When the voltage on two ends of the capacitor reaches operation voltage of the lightning arrester, the control circuit controls the lightning arrester to act at the T3 moment so that energy can be released from the lightning arrester. According to the series capacitor type high-voltage direct current breaker and the control method thereof, the mechanical switch does not have electric arc, non-arc breaking off is realized, energy is released through utilization of the lightning arrester, quick extinguishing of the electric arc is realized, and the failure current is cut off.
Description
Technical field
The present invention relates to electric power system circuit breaker, be specifically related to a kind of capacitive high voltage dc circuit breaker and control method thereof of sealing in.
Background technology
High voltage DC breaker has application prospect widely in based on the multiterminal flexible DC power transmission of IGBT and direct current network system.Traditional AC circuit breaker is mainly to use two current zeros of alternating current within each cycle to come extinguish arcs, thereby drop-out current, and do not have the natural zero-crossing point in direct current system, so how fast the difficulty of high voltage DC breaker drop-out current is extinguish arcs.Dc circuit breaker generally is comprised of change over switch, change-over circuit and energy consumer three parts, as shown in Figure 1.It mainly cut-offs sequential: during separating brake, electric current first is transformed into change-over circuit from change over switch, then changes the energy consumer dissipation energy over to the residual amount of energy in the dissipation direct current system, and DC loop is disconnected.
And existing dc circuit breaker adopts electric arc negative resistance charactertistic and the auxiliary branch capacitor and inductor resonance of circuit breaker, thereby make zero crossing on mechanical switch, realize disjunction, and existing dc circuit breaker there is the resonance branch road, electric arc is arranged, and the auxiliary branch capacitor and inductor easily produces resonance.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of capacitive high voltage dc circuit breaker and control method thereof of sealing in, the present invention realizes that mechanical switch does not play electric arc, realize that non-arc breaking is disconnected, use lightning arrester that energy is released, thereby realize quick extinguish arcs, the disengagement failure electric current.
The objective of the invention is to adopt following technical proposals to realize:
The invention provides a kind of capacitive high voltage dc circuit breaker that seals in, described circuit breaker comprises the dc circuit breaker unit of series connection, each described dc circuit breaker unit comprises change over switch, change-over circuit and energy consumer in parallel, and its improvements are, described change over switch adopts mechanical switch; Described change-over circuit adopts the capacitance-resistance branch road, and described energy consumer adopts lightning arrester; Described high voltage DC breaker is connected with control circuit, and described control circuit realizes that for the shutoff of controlling mechanical switch, control capacitance-resistance branch road fault current shifts, and the energy of inhibition mechanical switch both end voltage and control lightning arrester is released.
Wherein, described capacitance-resistance branch road comprises capacitor and the resistance of series connection; Described capacitor and resistance are connected in parallel on mechanical switch two ends.
Wherein, described resistance and diodes in parallel.
Wherein, be connected in parallel on the capacitor at mechanical switch two ends when mechanical switch disconnects, make the mechanical switch both end voltage all the time lower than its corresponding arcing voltage of opening distance, realize disconnecting without arc of mechanical switch;
Described resistance is for the resonance between the electric power system reactance of suppression capacitor after the mechanical switch separating brake and the dc circuit breaker of installing; Short-circuit resistance when diode is transferred to the capacitance-resistance branch road for fault current, and the vibration between elimination capacitor and system reactance; Lightning arrester is used for restriction high voltage DC breaker both end voltage.
Wherein, described mechanical switch can be realized disconnecting without arc fast.
Wherein, described control circuit adopts controller.
Wherein, described energy consumer or employing adjustable resistance.
The present invention is based on a kind of capacitive high voltage dc circuit breaker control method that seals in that another purpose provides, its improvements are, described control method comprises the steps:
(1) mechanical switch detects fault current, and constantly moves at T1, and fault current is transferred in the capacitance-resistance branch road;
(2) described fault current is the capacitor charging in the capacitance-resistance branch road, and control circuit is controlled mechanical switch and disconnected, mechanical switch disconnect T2 constantly before, the charging voltage at capacitor two ends is all the time lower than the arcing voltage between the mechanical switch fracture;
When (3) described capacitor voltage at both ends reached lightning arrestor movement voltage, at T3 control circuit control constantly lightning arrestor movement, energy was released from lightning arrester.
Wherein, described T1 is 1ms after fault occurs, and described T2 and T1 differ 2ms, and described T3 and T2 differ 1ms.
Compared with the prior art, the beneficial effect that reaches of the present invention is:
1, capacitive high voltage dc circuit breaker and the control method thereof of sealing in provided by the invention, can satisfy fast shut-off fault current demand, can realize that the non-arc breaking of mechanical switch is disconnected, the simple to operation and complete function of control method.
2, the present invention utilizes the speed of voltage on capacitor rising lower than mechanical switch medium recovery voltage speed all the time, thereby realize that mechanical switch does not play electric arc, realize that non-arc breaking is disconnected, and there is no resonant tank in this topology, avoided auxiliary branch capacitor and inductor resonance.
3, Topology Structure Design two fractures of the present invention, shorten each fracture stroke distances, and the circuit breaker responsiveness is doubled, thereby realize quick extinguish arcs, the disengagement failure electric current.
4, the capacitive high voltage dc circuit breaker fast response time that seals in provided by the invention, topological structure is simple, saves cost.
Description of drawings
Fig. 1 is dc circuit breaker basic principle figure;
Fig. 2 is the capacitive high voltage dc circuit breaker topology diagram that seals in provided by the invention;
Fig. 3 is that high voltage DC breaker provided by the invention is controlled sequential chart.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The invention provides and a kind ofly seal in capacitive high voltage dc circuit breaker topological structure as shown in Figure 2, circuit breaker comprises the dc circuit breaker unit of series connection, each described dc circuit breaker unit comprises change over switch, change-over circuit and energy consumer in parallel, and change over switch of the present invention adopts mechanical switch; Change-over circuit adopts the capacitance-resistance branch road, and the capacitance-resistance branch road comprises capacitor and the resistance of series connection; Capacitor and resistance are connected in parallel on mechanical switch two ends, resistance and diodes in parallel.Energy consumer adopts lightning arrester or adjustable resistance; High voltage DC breaker is connected with control circuit, and control circuit realizes that for the shutoff of controlling mechanical switch, control capacitance-resistance branch road fault current shifts, and the energy of inhibition mechanical switch both end voltage and control lightning arrester is released.The electromagnetic pulse that mechanical switch sends by control circuit realizes turning on and off.Control circuit adopts controller.
The effect that is connected in parallel on the high-voltage capacitor at mechanical switch two ends in this structure is when mechanical switch disconnects, and makes the mechanical switch both end voltage all the time lower than its corresponding arcing voltage of opening distance, thereby realizes disconnecting without arc of mechanical switch.The selection of capacitor will be considered fracture voltage that mechanical switch can bear and the peak value of system failure electric current simultaneously, capacitor is selected too small, can not satisfy voltage request, selects excessive, can not satisfy current requirements, so the selection of capacitor needs balanced voltage and electric current.Occurrence need to obtain according to dc circuit breaker institute power application system value.The effect of resistance is the resonance that suppresses after the mechanical switch separating brake between electric capacity and system reactance.The effect of diode be the fault current transfer during to the capacitance-resistance branch road short-circuit resistance and eliminate electric capacity and system reactance between vibration.The effect in lightning arrester loop is the limiting circuit breaker both end voltage.
The present invention also provides the control method that seals in the capacitive high voltage dc circuit breaker, specifically comprises the steps:
When 1, fault occured, mechanical switch detected fault current, and T1 moves constantly, shifted fault current to the capacitance-resistance loop.
2, fault current is transferred to the capacitance-resistance branch road, and be capacitor charging in the capacitance-resistance branch road, control circuit is controlled mechanical switch and is disconnected, at mechanical switch before thorough opening time, be that T2 is before the moment, the charging voltage at capacitor two ends is all the time lower than the arcing voltage between the mechanical switch fracture, thereby realizes that mechanical switch disconnects without arc.
3, when capacitor voltage at both ends reaches lightning arrestor movement voltage, i.e. in the T3 moment, control circuit is controlled lightning arrestor movement, and energy is released from the lightning arrester branch road.High voltage DC breaker is controlled sequential as shown in Figure 3.
Described T1 is 1ms after fault occurs, and T2 and T1 differ 2ms, and T3 and T2 differ 1ms.
Whole process implementation mechanical switch disconnect without arc fast and the fault current excision, reach the application target of high voltage DC breaker.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. one kind seals in the capacitive high voltage dc circuit breaker, described circuit breaker comprises the dc circuit breaker unit of series connection, each described dc circuit breaker unit comprises change over switch, change-over circuit and energy consumer in parallel, it is characterized in that, described change over switch adopts mechanical switch; Described change-over circuit adopts the capacitance-resistance branch road, and described energy consumer adopts lightning arrester; Described high voltage DC breaker is connected with control circuit, and described control circuit realizes that for the shutoff of controlling mechanical switch, control capacitance-resistance branch road fault current shifts, and the energy of inhibition mechanical switch both end voltage and control lightning arrester is released.
2. the capacitive high voltage dc circuit breaker that seals in as claimed in claim 1, is characterized in that, described capacitance-resistance branch road comprises capacitor and the resistance of series connection; Described capacitor and resistance are connected in parallel on mechanical switch two ends.
3. the capacitive high voltage dc circuit breaker that seals in as claimed in claim 2, is characterized in that described resistance and diodes in parallel.
4. the capacitive high voltage dc circuit breaker that seals in as claimed in claim 2, it is characterized in that, be connected in parallel on the capacitor at mechanical switch two ends when mechanical switch disconnects, make the mechanical switch both end voltage all the time lower than its corresponding arcing voltage of opening distance, realize disconnecting without arc of mechanical switch;
Described resistance is for the resonance between the electric power system reactance of suppression capacitor after the mechanical switch separating brake and the dc circuit breaker of installing; Short-circuit resistance when diode is transferred to the capacitance-resistance branch road for fault current, and the vibration between elimination capacitor and system reactance; Lightning arrester is used for restriction high voltage DC breaker both end voltage.
5. the capacitive high voltage dc circuit breaker that seals in as claimed in claim 1, is characterized in that, described mechanical switch can be realized disconnecting without arc fast.
6. the capacitive high voltage dc circuit breaker that seals in as claimed in claim 1, is characterized in that, described control circuit adopts controller.
7. the capacitive high voltage dc circuit breaker that seals in as claimed in claim 1, is characterized in that, described energy consumer or employing adjustable resistance.
8. one kind seals in capacitive high voltage dc circuit breaker control method, it is characterized in that, described control method comprises the steps:
(1) mechanical switch detects fault current, and constantly moves at T1, and fault current is transferred in the capacitance-resistance branch road;
(2) described fault current is the capacitor charging in the capacitance-resistance branch road, and control circuit is controlled mechanical switch and disconnected, mechanical switch disconnect T2 constantly before, the charging voltage at capacitor two ends is all the time lower than the arcing voltage between the mechanical switch fracture;
When (3) described capacitor voltage at both ends reached lightning arrestor movement voltage, at T3 control circuit control constantly lightning arrestor movement, energy was released from lightning arrester.
9. the capacitive high voltage dc circuit breaker control method that seals in as claimed in claim 8, is characterized in that, described T1 is 1ms after fault occurs, and described T2 and T1 differ 2ms, and described T3 and T2 differ 1ms.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762547A (en) * | 2014-01-08 | 2014-04-30 | 西安交通大学 | Modular high-voltage vacuum direct current on-off device based on artificial zero crossing |
| CN104009450A (en) * | 2014-05-07 | 2014-08-27 | 华南理工大学 | Module combination high-voltage direct-current breaker |
| CN104934929A (en) * | 2015-06-23 | 2015-09-23 | 华南理工大学 | Modularized power electronic high-voltage direct-current circuit breaker |
| CN105656019A (en) * | 2016-01-26 | 2016-06-08 | 华中科技大学 | Capacitive charging DC breaker and application thereof |
| CN105793948A (en) * | 2013-12-20 | 2016-07-20 | 西门子公司 | Apparatus and method for switching a direct current |
| CN106300301A (en) * | 2016-10-12 | 2017-01-04 | 清华大学 | Two-way mechanical formula dc circuit breaker based on change of current drive circuit and control method thereof |
| CN106532757A (en) * | 2016-11-17 | 2017-03-22 | 南方电网科学研究院有限责任公司 | Bipolar flexible DC power transmission system, converter station thereof and control method of converter station |
| WO2017080354A1 (en) * | 2015-11-14 | 2017-05-18 | 华中科技大学 | High voltage dc circuit breaker having coupled inductor |
| CN107731593A (en) * | 2017-09-14 | 2018-02-23 | 西安交通大学 | A kind of solid dielectric plug-in type differential of the arc direct current cut-offs breaker and its cutoff method |
| CN107834526A (en) * | 2017-12-19 | 2018-03-23 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七二研究所） | A kind of hybrid DC solid circuit breaker and its control method |
| CN108028148A (en) * | 2015-09-15 | 2018-05-11 | 西门子公司 | DC switchgear and its application |
| 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 |
| CN108766830A (en) * | 2018-07-02 | 2018-11-06 | 华中科技大学 | A kind of manifold type high voltage DC breaker |
| CN109546656A (en) * | 2018-11-07 | 2019-03-29 | 姜田贵 | A kind of energy consumption branch and control method |
| CN111244908A (en) * | 2020-01-19 | 2020-06-05 | 国网江苏省电力有限公司电力科学研究院 | Mechanical direct current breaker and control method thereof |
| CN112421589A (en) * | 2020-12-01 | 2021-02-26 | 平高集团有限公司 | Hybrid direct current breaker with graded turn-off |
| CN113196074A (en) * | 2018-11-13 | 2021-07-30 | 伊利诺伊理工学院 | Hybrid circuit breaker using transient commutation current injection circuit |
| CN113922345A (en) * | 2021-09-30 | 2022-01-11 | 广东电网有限责任公司 | Direct-current arc-free fault current limiter and control method |
| CN114421420A (en) * | 2022-02-10 | 2022-04-29 | 华北电力大学（保定） | Resistance-inductance current-limiting type multi-port direct-current circuit breaker suitable for flexible direct-distribution power grid |
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Effective date of registration: 20170524 Address after: 102200 Beijing city Changping District South Shao Zhen Nan Road No. 16 Co-patentee after: State Grid Corporation of China Patentee after: China-EPRI Electric Power Engineering Co., Ltd. Address before: 102211 Beijing city Changping District Xiaotangshan town big East Village Road No. 270 (future technology city) Co-patentee before: China-EPRI Electric Power Engineering Co., Ltd. Patentee before: State Grid Smart Grid Institute Co-patentee before: State Grid Corporation of China |