CN103117528B - One seals in capacitive high voltage DC circuit breaker and control method thereof - Google Patents

One seals in capacitive high voltage DC circuit breaker and control method thereof Download PDF

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Publication number
CN103117528B
CN103117528B CN201310018003.3A CN201310018003A CN103117528B CN 103117528 B CN103117528 B CN 103117528B CN 201310018003 A CN201310018003 A CN 201310018003A CN 103117528 B CN103117528 B CN 103117528B
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China
Prior art keywords
voltage
mechanical switch
control
capacitor
circuit
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CN201310018003.3A
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Chinese (zh)
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CN103117528A (en
Inventor
刘远
曹均正
王高勇
罗湘
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国网智能电网研究院
中电普瑞电力工程有限公司
国家电网公司
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Priority to CN201310018003.3A priority Critical patent/CN103117528B/en
Publication of CN103117528A publication Critical patent/CN103117528A/en
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Publication of CN103117528B publication Critical patent/CN103117528B/en

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Abstract

The present invention relates to one and seal in capacitive high voltage DC circuit breaker and control method thereof, circuit breaker comprises the DC circuit breaker unit of series connection, and each DC circuit breaker unit comprises change over switch in parallel, change-over circuit and energy consumer, and change over switch adopts mechanical switch; Change-over circuit adopts capacitance-resistance branch road, and energy consumer adopts lightning arrester; High voltage DC breaker is connected with control circuit, and mechanical switch detects fault current, and in T1 moment action, is transferred to by fault current in capacitance-resistance branch road; Fault current is capacitor charging, and control mechanical switch and disconnect, before mechanical switch disconnects the T2 moment, the charging voltage at capacitor two ends is all the time lower than the arcing voltage between mechanical switch fracture; When capacitor voltage at both ends reaches lightning arrestor movement voltage, control lightning arrestor movement at T3 moment control circuit, energy is released from lightning arrester.The present invention realizes mechanical switch and does not play electric arc, realizes thick-less vane, uses lightning arrester that energy is released, realizes extinguish fast electric arc, disengagement failure electric current.

Description

One seals in capacitive high voltage DC circuit breaker and control method thereof

Technical field

The present invention relates to electric power system circuit breaker, be specifically related to one and seal in capacitive high voltage DC circuit breaker and control method thereof.

Background technology

High voltage DC breaker has application prospect widely in based on the Multi-end flexible direct current transmission of IGBT and direct current network system.Traditional AC circuit breaker is mainly applied two current zeros of alternating current within each cycle and is carried out extinguish arcs, thus drop-out current, and in direct current system, there is not natural zero-crossing point, therefore the difficulty of high voltage DC breaker drop-out current is how extinguish fast electric arc.DC circuit breaker generally by change over switch, change-over circuit and energy consumer three part form, as shown in Figure 1.It mainly cut-offs sequential: during separating brake, and electric current is first transformed into change-over circuit from change over switch, then proceeds to energy consumer dissipation energy with the residual amount of energy in dissipation direct current system, finally makes DC loop disconnect.

And existing DC circuit breaker adopts electric arc negative resistance charactertistic and the auxiliary branch capacitor and inductor resonance of circuit breaker, thus zero crossing is manufactured on mechanical switch, realize disjunction, and existing DC circuit breaker there is resonant branch, have electric arc, auxiliary branch capacitor and inductor easily produces resonance.

Summary of the invention

For the deficiencies in the prior art, the invention provides one and seal in capacitive high voltage DC circuit breaker and control method thereof, the present invention realizes mechanical switch and does not play electric arc, realize thick-less vane, use lightning arrester that energy is released, thus realize extinguish fast electric arc, disengagement failure electric current.

The object of the invention is to adopt following technical proposals to realize:

The invention provides one and seal in 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 in parallel, change-over circuit and energy consumer, and its improvements are, described change over switch adopts mechanical switch; Described change-over circuit adopts capacitance-resistance branch road, and described energy consumer adopts lightning arrester; Described high voltage DC breaker is connected with control circuit, described control circuit for control mechanical switch shutoff, control capacitance-resistance branch road and realize fault current transfer, and the energy suppressing 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 resistor coupled in parallel are at mechanical switch two ends.

Wherein, described resistance and diodes in parallel.

Wherein, the capacitor being connected in parallel on mechanical switch two ends, when mechanical switch disconnects, makes mechanical switch both end voltage all the time lower than its corresponding arcing voltage opening distance, realizes disconnecting without arc of mechanical switch;

Described resistance be used for suppression capacitor after mechanical switch separating brake and DC circuit breaker is installed electric power system reactance between resonance; Diode is used for short-circuit resistance when fault current transfers to capacitance-resistance branch road, and eliminates the vibration between capacitor and system reactance; Lightning arrester is for limiting high voltage DC breaker both end voltage.

Wherein, described mechanical switch can realize disconnecting without arc fast.

Wherein, described control circuit adopts controller.

Wherein, described energy consumer or employing adjustable resistance.

The one that the present invention is based on another object provides seals in capacitive high voltage DC circuit breaker control method, and its improvements are, described control method comprises the steps:

(1) mechanical switch detects fault current, and in T1 moment action, is transferred to by fault current in capacitance-resistance branch road;

(2) described fault current is the capacitor charging in capacitance-resistance branch road, and control circuit controls mechanical switch and disconnects, and before mechanical switch disconnects the T2 moment, the charging voltage at capacitor two ends is all the time lower than the arcing voltage between mechanical switch fracture;

(3), when described capacitor voltage at both ends reaches lightning arrestor movement voltage, control lightning arrestor movement at T3 moment control circuit, energy is released from lightning arrester.

Wherein, described T1 is 1ms after fault occurs, and described T2 and T1 differs 2ms, and described T3 and T2 differs 1ms.

Compared with the prior art, the beneficial effect that the present invention reaches is:

1, provided by the inventionly seal in capacitive high voltage DC circuit breaker and control method thereof, fast shut-off fault current demand can be met, the thick-less vane of mechanical switch can be realized, the simple to operation and complete function of control method.

2, the present invention's speed of utilizing voltage on capacitor to rise is lower than mechanical switch medium recovery ltage rate all the time, thus realize mechanical switch and do not play electric arc, realize thick-less vane, and there is no resonant tank in this topology, avoid auxiliary branch capacitor and inductor resonance.

3, Topology Structure Design two fracture of the present invention, shortens each fracture stroke distances, breaker actuation speed can be made to double, thus realize extinguish fast electric arc, disengagement failure electric current during the action simultaneously of two fractures.

4, provided by the inventionly seal in capacitive high voltage DC circuit breaker fast response time, topological structure is simple, saves cost.

Accompanying drawing explanation

Fig. 1 is DC circuit breaker general principle figure;

Fig. 2 provided by the inventionly seals in capacitive high voltage direct-current breaker topology structure chart;

Fig. 3 is high voltage DC breaker Control timing sequence figure provided by the invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

The invention provides one and seal in capacitive high voltage direct-current breaker topology 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 in parallel, change-over circuit and energy consumer, and change over switch of the present invention adopts mechanical switch; Change-over circuit adopts capacitance-resistance branch road, and capacitance-resistance branch road comprises capacitor and the resistance of series connection; Capacitor and resistor coupled in parallel at 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, control circuit for control mechanical switch shutoff, control capacitance-resistance branch road and realize fault current transfer, and the energy suppressing mechanical switch both end voltage and control lightning arrester is released.Mechanical switch realizes turning on and off by the electromagnetic pulse that control circuit sends.Control circuit adopts controller.

The effect being connected in parallel on the high-voltage capacitor at mechanical switch two ends in this structure is when mechanical switch disconnects, and makes mechanical switch both end voltage all the time lower than its corresponding arcing voltage opening distance, thus realizes disconnecting without arc of mechanical switch.The selection of capacitor will consider the peak value of the fracture voltage that mechanical switch can bear and system failure electric current simultaneously, capacitor is selected too small, then can not meet voltage request, select excessive, then can not meet current requirements, therefore the selection of capacitor needs balanced voltage and electric current.Occurrence needs to obtain according to DC circuit breaker institute power application system value.The effect of resistance is the resonance suppressed after mechanical switch separating brake between electric capacity and system reactance.The effect of diode is fault current short-circuit resistance vibration eliminated between electric capacity and system reactance when transferring to capacitance-resistance branch road.The effect in lightning arrester loop is limiting circuit breaker both end voltage.

Present invention also offers the control method sealing in capacitive high voltage DC circuit breaker, specifically comprise the steps:

1, when fault occurs, mechanical switch detects fault current, T1 moment action, and transfer fault current is in capacitance-resistance loop.

2, fault current transfers to capacitance-resistance branch road, and be the capacitor charging in capacitance-resistance branch road, control circuit controls mechanical switch and disconnects, before mechanical switch thorough opening time, namely before the T2 moment, the charging voltage at capacitor two ends all the time lower than the arcing voltage between mechanical switch fracture, thus realizes mechanical switch and disconnects without arc.

3, when capacitor voltage at both ends reaches lightning arrestor movement voltage, i.e. the T3 moment, control circuit controls lightning arrestor movement, and energy is released from lightning arrester branch road.High voltage DC breaker Control timing sequence as shown in Figure 3.

Described T1 is that 1ms, T2 and T1 differ 2ms, T3 and T2 difference 1ms after fault occurs.

Whole process implementation mechanical switch disconnects without arc fast and fault current excises, and reaches the application target of high voltage DC breaker.

Finally should be noted that: 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 to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.

Claims (1)

1. one kind seals in capacitive high voltage DC circuit breaker control method, it is characterized in that, the described DC circuit breaker unit sealing in capacitive high voltage DC circuit breaker and comprise series connection, each described DC circuit breaker unit comprises change over switch in parallel, change-over circuit and energy consumer, and described change over switch adopts mechanical switch; Described change-over circuit adopts capacitance-resistance branch road, and described energy consumer adopts lightning arrester; Described high voltage DC breaker is connected with control circuit, described control circuit for control mechanical switch shutoff, control capacitance-resistance branch road and realize fault current transfer, and the energy suppressing mechanical switch both end voltage and control lightning arrester is released;
Described capacitance-resistance branch road comprises capacitor and the resistance of series connection; Described capacitor and resistor coupled in parallel are at mechanical switch two ends;
Described resistance and diodes in parallel;
The capacitor being connected in parallel on mechanical switch two ends, when mechanical switch disconnects, makes mechanical switch both end voltage all the time lower than its corresponding arcing voltage opening distance, realizes disconnecting without arc of mechanical switch;
Described resistance be used for suppression capacitor after mechanical switch separating brake and DC circuit breaker is installed electric power system reactance between resonance; Diode is used for short-circuit resistance when fault current transfers to capacitance-resistance branch road, and eliminates the vibration between capacitor and system reactance; Lightning arrester is for limiting high voltage DC breaker both end voltage;
Described mechanical switch can realize disconnecting without arc fast;
Described control circuit adopts controller;
Described control method comprises the steps:
(1) mechanical switch detects fault current, and in T1 moment action, is transferred to by fault current in capacitance-resistance branch road;
(2) described fault current is the capacitor charging in capacitance-resistance branch road, and control circuit controls mechanical switch and disconnects, and before mechanical switch disconnects the T2 moment, the charging voltage at capacitor two ends is all the time lower than the arcing voltage between mechanical switch fracture;
(3), when described capacitor voltage at both ends reaches lightning arrestor movement voltage, control lightning arrestor movement at T3 moment control circuit, energy is released from lightning arrester;
Described T1 is 1ms after fault occurs, and described T2 and T1 differs 2ms, and described T3 and T2 differs 1ms.
CN201310018003.3A 2013-01-17 2013-01-17 One seals in capacitive high voltage DC circuit breaker and control method thereof CN103117528B (en)

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CN103117528B true CN103117528B (en) 2015-12-02

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EP3061111B1 (en) * 2013-12-20 2017-03-29 Siemens Aktiengesellschaft Apparatus and method for switching a direct current
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
CN104009450B (en) * 2014-05-07 2017-08-25 华南理工大学 Block combiner high voltage DC breaker
CN104934929A (en) * 2015-06-23 2015-09-23 华南理工大学 Modularized power electronic high-voltage direct-current circuit breaker
DE102015217578A1 (en) 2015-09-15 2017-03-16 Siemens Aktiengesellschaft DC switching device and its use
CN105305371B (en) * 2015-11-14 2018-05-25 华中科技大学 A kind of high voltage DC breaker with mutual reactor
CN105656019B (en) * 2016-01-26 2019-06-28 华中科技大学 A kind of capacitor charging type dc circuit breaker and its application
CN106300301B (en) * 2016-10-12 2019-04-23 清华大学 Two-way mechanical formula dc circuit breaker and its control method based on change of current driving circuit
CN107731593B (en) * 2017-09-14 2019-01-29 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
CN107834526B (en) * 2017-12-19 2019-03-19 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) A kind of hybrid DC solid circuit breaker and its control method
CN109546656A (en) * 2018-11-07 2019-03-29 姜田贵 A kind of energy consumption branch and control method

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Effective date of registration: 20170524

Address after: 102200 Beijing city Changping District South Shao Zhen Nan Road No. 16

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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)

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Patentee before: State Grid Smart Grid Institute

Co-patentee before: State Grid Corporation of China

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