CN108123423A

CN108123423A - A kind of mixed high-voltage dc circuit breaker based on the main disconnect switch type of thyristor full-bridge modules

Info

Publication number: CN108123423A
Application number: CN201611059313.XA
Authority: CN
Inventors: 郭春义; 李帅; 赵成勇
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2016-11-28
Filing date: 2016-11-28
Publication date: 2018-06-05
Anticipated expiration: 2036-11-28
Also published as: CN108123423B

Abstract

The present invention relates to a kind of mixed high-voltage dc circuit breakers based on the main disconnect switch type of thyristor full-bridge modules, belong to high pressure, super high voltage direct current electricity transmission technical field.The high voltage DC breaker is made of low-loss branch, main disconnect switch and energy absorption circuit, wherein low-loss branch routing Fast mechanical switch and a small amount of IGBT compositions；Main disconnect switch is made of thyristor and capacitor；Energy absorption circuit is made of arrester.Electric current is flowed through by low-loss access during normal operation, when DC line or equipment break down, turn off the IGBT of low-loss access, electric current be transferred to by thyristor groups into power electronics cutout branch in, treat that Fast mechanical switch reaches safety clearance, electric current is subsequently transferred in energy absorption branch, under the action of arrester, system capacity is rapidly absorbed, so as to which faulty line be cut off.

Description

A kind of mixed high-voltage direct current based on the main disconnect switch type of thyristor full-bridge modules breaks Road device

Technical field

The present invention relates to a kind of mixed high-voltage dc circuit breakers based on the main disconnect switch type of thyristor full-bridge modules, belong to High pressure, extra-high voltage direct-current transmission field.

Background technology

High pressure, extra-high voltage direct-current transmission have obtained more and more attention, following multiterminal element is defeated due to plurality of advantages Electricity and the DC grid thus built become trend, and the electric current of direct current transportation does not have zero crossing, it is impossible to as ac transmission Like that using zero crossing arc extinguishing, very big difficulty is brought to the realization of dc circuit breaker, current implementation method is divided into following It is several：Current zero-crossing point is generated based on superimposed oscillation electric current, and then realizes electric current disjunction, shortcoming is off postponing long, shut-off Electric current is limited；DC line increases inversion-rectification link, and the exchange side after inversion cuts off electric current, shortcoming with AC circuit breaker It is big to be off delay, to wait until that current zero-crossing point could turn off, and loss is big, involves great expense；The hybrid high pressure developed at present The power electronics cutout branch of dc circuit breaker is connected with substantial amounts of IGBT, since the voltage class of IGBT, through-current capability are weaker, Substantial amounts of IGBT connection in series-parallel is needed, improves the cost of system；For high pressure or extra-high voltage field dc circuit breaker exploitation according to So there are many problems demands to solve, develop and have become suitable for high voltage, the dc circuit breaker of high current occasion and compel to be essential It will.

The content of the invention

In order to overcome the above-mentioned deficiencies of the prior art, opened the present invention provides one kind based on the main open circuit of thyristor full-bridge modules The mixed high-voltage dc circuit breaker of pass type.

It is an object of the invention to overcome the shortcomings of current high voltage DC breaker turn-off capacity and cost it is excessively high lack Point.

The technical solution adopted in the present invention is：When normal operation, the Quick mechanical in low-loss access is turned on Switch（S_LCS）And corresponding IGBT, make current flow through low-loss access；It is triggered under failure according to fault current set direction Thyristor, and the IGBT in low-loss access is turned off, electric current is transferred to power electronics cutout branch, then, by thyristor Control can control the current direction of the branch, so as to which the capacitance voltage of submodule be maintained to be no more than its positive limit value voltage U_lim With reversed limit value voltage U_lim2, Fast mechanical switch is avoided to puncture again before opening；Treat that Fast mechanical switch reaches between safety When gap, maintain original IGBT group logic constant, as capacitance voltage reaches protection of arrester value, energy transfer arrives Arrester branch dissipates.

Compared with prior art, the present invention have the advantage that for：

1st, it is pressure-resistant, through-current capability is big, due to the characteristic of thyristor, pressure-resistant, through-current capability much larger than IGBT, so the breaker It can be applicable to higher voltage, the occasion of more high current；

2nd, at low cost, the cost of thyristor is lower than IGBT, and equalizer circuit is more ripe and since its pressure-resistant through-current capability is high, can be with The further usage amount for reducing device, so as to significantly reducing the cost of breaker.

Description of the drawings

The present invention is further described below in conjunction with the accompanying drawings.

Fig. 1 shows that a kind of mixed high-voltage dc circuit breaker circuit based on the main disconnect switch type of thyristor full-bridge modules shows It is intended to, which is one of form of Figure of abstract, has two-way turn-off capacity.Wherein：It is low-loss branch in dotted line frame 1, Including Fast mechanical switch and IGBT；It is power electronics cutout branch and energy absorption branch in dotted line frame 2, power electronics cutout Branch includes being made of multiple submodule, and each submodule is made of thyristor and capacitor；Energy absorption circuit is by arrester Composition.

Fig. 2 is shown using a kind of mixed high-voltage dc circuit breaker based on the main disconnect switch type of thyristor full-bridge modules Another form of circuit diagram, the structure are one of forms of Figure of abstract, have two-way turn-off capacity.In dotted line frame 1 For low-loss branch, including Fast mechanical switch and IGBT；It is power electronics cutout branch and energy absorption branch in dotted line frame 2 Road, power electronics cutout branch include being made of with capacitor the thyristor of multiple series connection, and energy absorption circuit is by arrester group Into.

Specific embodiment

Below in conjunction with the attached drawing in the embodiment of the present application, the technical solution in the embodiment of the present application is carried out clear, complete Site preparation describes.

Dotted line frame 1 includes Fast mechanical switch S in Fig. 1_LCSWith electric current transfer switch T_LCS, dotted line frame 2 is interior to include multiple sons Module, each submodule are made of 8 thyristors and a capacitor and energy absorption circuit；

In the circuit when normal operation, Fast mechanical switch S_LCSWith electric current transfer switch T_LCSIt is closed, electric current flows through void Branch shown in wire frame 1, due to T_LCSComprising IGBT negligible amounts, breaker runs with low-loss.

Failure occur when and current direction from left to right when, turn off low-loss access IGBT, simultaneously turn on main open circuit and open Thyristor T1, the T7 of each submodule in power electronics cutout circuit are closed, treats that electric current turns off Quick mechanical and opens after successfully shifting It closes；In electric current transfer process, group module capacitance reaches certain positive limit value voltage U_limWhen, T3, T5 are turned on, puts capacitance Electricity and reverse charging, when reverse charging to reversed limit value voltage U_lim2When, retriggered T1, T7 so move in circles, until fast Fast mechanical switch reaches safety clearance, then keeps the triggering logic of current thyristor.When capacitance voltage reaches protection of arrester Value, energy transfer dissipate to arrester branch.

Under failure and fault current direction from right to left when, turn off low-loss access IGBT, simultaneously turn on main open circuit Thyristor T6, the T4 of each submodule in switched power electronics cutout circuit, treat that electric current turns off Quick mechanical after successfully shifting Switch；In electric current transfer process, group module capacitance reaches certain reversed limit value voltage U_lim2When, T2, T8 are turned on, makes electricity Hold back discharge and positive charge, when being charged to positive limit value voltage U_limWhen, retriggered T6, T4 so move in circles, directly Reach safety clearance to Fast mechanical switch, then keep the triggering logic of current thyristor.When capacitance voltage reaches arrester Protection value, energy transfer dissipate to arrester branch.

Above-described is that a kind of mixed high-voltage dc circuit breaker based on the main disconnect switch type of thyristor full-bridge modules is opened Disconnected mode, Fig. 2 are the circuit diagrams of another way of realization of the type high voltage DC breaker, the difference with Fig. 1 It is Fig. 2 by the thyristor of Fig. 1, capacitor, arrester centralized arrangement, triggering logical AND control method is identical with Fig. 1's.

Finally it should be noted that：Described embodiment is only the reality of some embodiments of the present application rather than whole Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work Every other embodiment, shall fall in the protection scope of this application.

Claims

1. a kind of mixed high-voltage dc circuit breaker based on the main disconnect switch type of thyristor full-bridge modules, it is characterised in that：Just Often when operation, the Fast mechanical switch in low-loss access is turned on（S_LCS）And corresponding IGBT, make current flow through low-loss Access；Under failure and fault current direction from left to right when, turn off low-loss access IGBT, simultaneously turn on main disconnect switch Thyristor T1, the T7 of each submodule in power electronics cutout circuit, treat that electric current turns off Fast mechanical switch after successfully shifting； In electric current transfer process, group module capacitance reaches certain positive limit value voltage U_limWhen, turn on T3, T5, make capacitance discharge and Reverse charging, when reverse charging to reversed limit value voltage U_lim2When, retriggered T1, T7 so move in circles, until quick machine Tool switch reaches safety clearance, then keeps the triggering logic of current thyristor；When capacitance voltage reaches protection of arrester value, energy Amount is transferred to arrester branch and dissipates.

2. a kind of mixed high-voltage direct current interruption based on the main disconnect switch type of thyristor full-bridge modules according to claim 1 Device, it is characterised in that：When normal operation, the Fast mechanical switch in low-loss access is turned on（S_LCS）It is and corresponding IGBT makes current flow through low-loss access；Under failure and fault current direction from right to left when, shut-off low-loss access IGBT simultaneously turns on thyristor T6, the T4 of each submodule in main disconnect switch power electronics cutout circuit, treats that electric current successfully turns Shut-off Fast mechanical switch after moving；In electric current transfer process, group module capacitance reaches certain reversed limit value voltage U_lim2When, T2, T8 are turned on, makes capacitance back discharge and positive charge, when being charged to positive limit value voltage U_limWhen, retriggered T6, T4 so move in circles, and until Fast mechanical switch reaches safety clearance, then keep the triggering logic of current thyristor； When capacitance voltage reaches protection of arrester value, energy transfer dissipates to arrester branch.

3. a kind of mixed high-voltage direct current interruption based on the main disconnect switch type of thyristor full-bridge modules according to claim 1 Device, it is characterised in that：Dotted line frame 1 in figure is low-loss branch, is connected by Fast mechanical switch with a small amount of differential concatenation IGBT is formed；Dotted line frame 2 is power electronics cutout branch and energy absorption circuit in figure, and main disconnect switch power electronics cutout is propped up Routing multiple submodule is composed in series, and each submodule includes 8 thyristor components and a capacitor assembly composition, wherein often A thyristor component can be 1 thyristor or be made of several Thyristors in series, capacitor assembly by multiple capacitor strings simultaneously Connection composition；Energy absorption circuit is made of metal oxide arrester, and arrester can be with parallel connection in one or several submodules Block both ends.