CN115459211A - Inductance-resistance current-limiting type hybrid high-voltage direct-current circuit breaker topology and control method thereof - Google Patents
Inductance-resistance current-limiting type hybrid high-voltage direct-current circuit breaker topology and control method thereof Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
A resistance-inductance current-limiting type hybrid high-voltage direct-current circuit breaker topology and a control method thereof. The current-carrying branch of the topological structure is formed by connecting a UFD and a load transfer switch LCS in series, and two ends of the current-carrying branch are respectively connected with a direct current line interface; the phase change branches are divided into two pairs, and each phase change branch is formed by connecting a thyristor and a plurality of diodes in series; the transfer branch is formed by connecting an IGBT and a thyristor in series; the current limiting branch consists of three parallel branches, including one branch comprising a thyristor and several diodes connected serially and then connected parallelly with the thyristor and connected serially with the capacitor, one branch comprising an anti-parallel thyristor and one branch comprising an inductor connected parallelly with a resistor and then connected serially with the thyristor; the charging branch circuit is formed by connecting a capacitor and a thyristor in series and grounding; the breaking branch is formed by connecting an IGBT (insulated gate bipolar translator) and a metal oxide arrester MOA in parallel. Based on the matching of the phase change of the thyristors, the use of a large number of thyristors is reduced and the cost is reduced under the condition of meeting the characteristics of voltage resistance and current resistance.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a resistance-inductance current-limiting type hybrid high-voltage direct-current circuit breaker based on thyristor commutation matching.
Background
With the increasing proportion of renewable energy sources, the existing power system is greatly influenced, and particularly, the traditional high-voltage alternating-current power transmission is greatly challenged. Due to the intermittency and volatility of renewable energy sources, the traditional high-voltage alternating-current transmission is still not fully qualified for transmission requirements. Compared with the traditional high-voltage alternating-current transmission, the high-voltage direct-current transmission has the advantages of high response speed, low loss, good stability and the like, and is rapidly developed in recent years. However, the direct current transmission has the characteristics of low impedance and low inertia, so that when a fault occurs, the current rises rapidly in a very short time, and the power system is seriously endangered if the fault is not cleared in time. The traditional hybrid high-voltage direct-current circuit breaker has a series of defects of low fault clearing speed, poor current limiting effect, short service life, high cost and the like.
Aiming at the problems of the traditional hybrid high-voltage direct-current circuit breaker, the invention provides a resistance-inductance current-limiting hybrid high-voltage direct-current circuit breaker topology based on thyristor commutation matching and a control method thereof.
Disclosure of Invention
The invention provides a resistance-inductance current-limiting hybrid high-voltage direct-current circuit breaker topology and a control method thereof, which are based on the phase-change coordination of thyristors, reduce the use of a large number of thyristors and reduce the cost under the condition of meeting the characteristics of pressure resistance and current resistance.
A resistive-inductive current-limiting hybrid high-voltage dc circuit breaker topology, comprising: a current-carrying branch, a phase-changing branch, a transfer branch, a current-limiting branch, a charging branch and a cut-off branch;
the two ends of the current-carrying branch are respectively connected with the direct-current line interface, and the current-carrying branch is connected with the mechanical switch UFD and the load transfer switch LCS in series, wherein the load transfer switch LCS is formed by two groups of IGBTs in anti-series connection;
the phase change branches are totally four groups, each phase change branch is formed by connecting a thyristor and a plurality of diodes in series, the four groups of phase change branches are arranged in the upward direction of a current outlet and are respectively arranged at two sides, the phase change branches at the same side are connected end to end, the phase change branches at different sides are directly connected, meanwhile, the end to end part of each side is respectively connected with a corresponding interface of a direct current circuit, and the whole phase change branch forms a bridge structure;
the transfer branch is formed by connecting a plurality of IGBT groups and thyristors in series and is connected in the bridge structure of the phase change branch;
the current limiting branch circuit is connected with the transfer branch circuit in parallel and consists of three parallel branch circuits, wherein the first branch circuit is a branch circuit formed by connecting a thyristor and a plurality of diodes in series and then connecting the thyristors in anti-parallel and connecting the thyristors in series with a capacitor, the second branch circuit is a branch circuit formed by connecting an inductor in parallel and then connecting the resistors in series with the thyristors, and the third branch circuit is a branch circuit formed by connecting an inductor in parallel and connecting the resistors in series with the thyristors;
the charging branch circuit is formed by grounding a capacitor and a thyristor in series and is connected to the upper end of the capacitor of the first current-limiting branch circuit;
the cut-off branch consists of an IGBT group T 8 The phase-change circuit is connected with a metal oxide arrester MOA in parallel, is connected on a current-limiting branch in series, and is connected in parallel inside a bridge type of a phase-change branch after being connected with the current-limiting branch in series.
Preferably, the commutation branches of the present invention have four groups, each Q 1 、Q 2 、Q 3 、Q 4 And the number of the diodes connected in series in each group of the phase change branch circuit and the current limiting branch circuit is determined according to the actual maximum voltage and current.
Preferably, the IGBT groups T in the transfer branch of the invention 3 And thyristor T 2 Connected in series and then connected with an IGBT group T of a cut-off branch 8 A current path is formed.
Preferably, the charging branch of the present invention is connected to the capacitor C of the first current limiting branch 1 Upper end connected with capacitor C 2 And thyristor T 9 Grounding and charging branch capacitor C 2 Pressure-bearing size-required current-limiting branchCapacitor C 1 And (4) determining the pressure bearing size.
Preferably, the inductor L in the third branch of the current limiting branch of the present invention 1 And a resistance R 1 Parallel connection with thyristor T 7 In series and a second branch circuit thyristor T 6 The first branch thyristor T is connected in inverse parallel with the third branch to form a bypass loop 4 After natural shut-off, thyristor T 5 And a capacitor C 1 The series connection and the third branch form an energy discharge loop.
Based on the control method of the resistance-inductance current-limiting type hybrid high-voltage direct-current circuit breaker topology, the circuit breaker works in the following three modes:
if the circuit breaker is placed at the left end of the direct current transmission line, namely the current direction is rightward, the capacitor of the circuit breaker is precharged firstly, and the phase change branch Q is conducted 1 IGBT group T in transfer branch 3 And thyristor T 2 Thyristor T in charging branch 9 And phase-changing branch Q after charging 1 And thyristor T 9 Naturally shutting off;
a fault clearing mode: when abnormal current is detected, a fault clearing command is sent to the circuit breaker, and the phase change branch Q of the circuit breaker is immediately conducted 1 And a phase-changing branch Q 4 Thyristor T of transfer branch 2 IGBT group T for switching on/off branch circuit 8 Turning off the current-carrying branch, quickly transferring current from the current-carrying branch to the transfer branch, and quickly opening the mechanical switch K 1 Completing the brake opening after the rated opening distance is reached; thyristor T for continuously conducting first branch of current-limiting branch 4 Capacitor C 1 Starting to discharge, thyristor T 2 After the current is cut off after the current bears the inverse voltage, the current is transferred to the first branch of the current limiting branch, and a capacitor C 1 Starting to charge in reverse direction, and turning on the thyristor T under the action of forward voltage 7 Adding a current-limiting inductor L 1 And a resistance R 1 At this time, due to the capacitance C 1 The charging current is gradually reduced to the thyristor T 4 Naturally turning off, and gradually transferring the current to the third branch of the current limiting branch; after the current limiting is completely put into use, if the system fault judgment is completed at the moment, the breaker receives a fault clearing commandThen the IGBT group T of the cut-off branch is turned off 8 Switching MOA into the circuit for breaking and simultaneously conducting the second branch T of the current-limiting branch 6 Bypassing the inductive resistor, rapidly reducing the current due to the nonlinear characteristic of the MOA, and finishing fault clearing when the MOA is in a high-resistance state when the current is reduced to zero; to release the energy of the bypass inductor and resistor in the current-limiting branch, the thyristor T of the second branch of the current-limiting branch is switched on 5 Throw-in capacitor C 1 At this time, the thyristor T 6 Subject to the capacitor C having been charged in reverse 1 Is turned off by the back voltage of the thyristor T of the first branch of the current-limiting branch 5 And a capacitor C 1 The third branch is connected in series to form an energy discharge loop;
a current limiting recovery mode: if the system judges that the fault clearing is not needed, the current recovery is needed, and the circuit breaker receives the current-limiting recovery command and then conducts the thyristor T of the transfer branch 2 And thyristor T of the second branch of the current-limiting branch 6 Bypassing the inductor and the resistor of the current limiting branch, and transferring the current from the third branch of the current limiting branch to the transfer branch; then UFD is switched on, current-carrying branch is switched on after switching-on is completed, and IGBT group T of transfer branch is switched off 3 At this time, the current is completely restored to the current-carrying branch circuit, and then the thyristor T of the second branch of the current-limiting branch circuit is conducted 5 Input capacitance C 1 Discharging energy from the inductor;
maintenance power-off mode: if the circuit needs to be maintained and powered off, the system sends a circuit maintenance command to the circuit breaker, the circuit breaker does not need to carry out current limiting after the current is transferred to the transfer branch circuit, UFD brake opening is directly waited to be completed, and the IGBT group T of the disconnected branch circuit is turned off 8 Adding MOA to perform a breaking process.
By adopting the technical scheme, compared with the prior art, the invention has no following advantages:
1. the third branch of the current-limiting branch circuit adopts a current-limiting reactance and a current-limiting resistor which are connected in parallel, so that the current rise is inhibited; the second branch adds a group of thyristors T 6 A loop is formed to bypass the current-limiting inductor and the resistor, so that the energy consumption burden of the MOA is reduced, and the service life of the MOA is prolonged; first branch capacitor C 1 And thyristor T 5 Serially connected to a current-limiting inductor resistorA power relief circuit.
2. Transfer branch series IGBT group T 3 And thyristor T 2 The current transfer path can be provided for fault removal, and a temporary controllable path is provided for current limiting recovery.
3. The charging branch circuit of the invention uses a thyristor and a capacitor C 2 Grounding, change C 2 The size of C can be flexibly changed 1 To suit the actual requirements of the circuit breaker.
4. The phase change branch and the current limiting branch adopt the thyristor series diode group to replace the traditional pure thyristor group, thereby reducing the use of a large number of thyristors and reducing the cost under the condition of meeting the characteristics of voltage resistance and current resistance.
5. The working modes are three types: dealing with abnormal current, a fault clearing mode and a current limiting recovery mode; the maintenance and power-off are needed in response to the normal state, and a maintenance and power-off mode is available; the three working modes of the circuit breaker can flexibly meet the basic working requirements of the direct-current transmission project.
Drawings
FIG. 1 is a schematic diagram of the circuit topology of the present invention.
FIG. 2 is a schematic diagram of a current loop during normal operation of the present invention.
FIG. 3 is a diagram of a pre-charge current loop with a built-in capacitor according to the present invention.
Fig. 4 is a schematic diagram of a current loop of the dc circuit breaker according to the present invention operating in a fault clearing mode and at each operation timing.
Fig. 5 is a schematic diagram of a current loop of the dc circuit breaker according to the present invention in a current limiting recovery mode and at each operation timing.
Fig. 6 is a schematic view of a current loop of each operation sequence when the dc circuit breaker of the present invention operates in a maintenance power-off mode.
Detailed Description
The invention provides a resistance-inductance current-limiting type hybrid high-voltage direct-current circuit breaker topology and a control method thereof, and the invention is further elaborated in detail by combining the attached drawings.
As shown in fig. 1, the topological structure of the resistive-inductive current-limiting hybrid high-voltage dc circuit breaker of the present invention mainly comprises 6 branches: the device comprises a current-carrying branch, a phase-changing branch, a transfer branch, a current-limiting branch, a charging branch and a cut-off branch. Wherein, the current-carrying branch circuit is connected with the UFD and the LCS in series, and two ends of the current-carrying branch circuit are respectively connected with the DC line interface; the phase change branches are divided into two pairs, and each phase change branch is formed by connecting a thyristor and a plurality of diodes in series; the transfer branch is formed by connecting an IGBT and a thyristor in series; the current-limiting branch consists of three parallel branches, including one branch formed by connecting a thyristor and a plurality of diodes in series and then connecting the anti-parallel thyristor in series with a capacitor, one anti-parallel thyristor branch, and one branch formed by connecting an inductor in parallel with a resistor and then connecting the inductor in series with the thyristor; the charging branch circuit is formed by connecting a capacitor and a thyristor in series and grounding; the breaking branch is formed by connecting an IGBT and a metal oxide arrester MOA in parallel. Meanwhile, the invention provides a control mode of the circuit breaker topology.
The two ends of the current-carrying branch are respectively connected with the direct-current line interface, and the current-carrying branch is connected with a mechanical switch UFD (K) 1 ) And a load transfer switch LCS, wherein the load transfer switch LCS is formed by an IGBT group T 1a And IGBT group T 1b Are anti-series connected;
the phase change branches, totally four groups, are Q respectively 1 、Q 2 、Q 3 、Q 4 Each phase-change branch is formed by connecting a thyristor and a plurality of diodes in series, and the number of the diodes connected in series with each phase-change branch and the current-limiting branch is determined according to the actual maximum voltage and current. Four groups of phase change branches are arranged in the upward direction of a current outlet and are respectively arranged on two sides, the phase change branches on the same side are connected end to end, the phase change branches on different sides are directly connected, meanwhile, the end to end part of each side is respectively connected with a corresponding interface of a direct current circuit, and the whole phase change branch forms a bridge structure;
the transfer branch is composed of an IGBT group T 3 And thyristor T 2 Connected in series and in parallel inside the bridge structure of the phase-change branch circuit, and then connected with the IGBT group T of the breaking branch circuit 8 Forming a current path;
the current limiting branch is connected with the transfer branch in parallel and consists of three parallel branches, wherein the first branch is formed by connecting a thyristor and a plurality of diodes in series and then connecting the thyristor and the diodes in seriesThe anti-parallel thyristor is also connected with the branch circuit of the capacitor in series, the second branch is an anti-parallel thyristor branch circuit, and the third branch is a branch circuit formed by connecting the inductor in parallel with the resistor and then connecting the inductor in series with the thyristor. The structure is that the inductance L in the third branch of the current-limiting branch 1 And a resistance R 1 Connected in parallel with a thyristor T 7 Series and second branch circuit thyristor T 6 The third branch is connected in antiparallel to form a bypass loop, and the first branch T 4 After natural shut-off, T 5 And C 1 The series connection and the third branch form an energy discharge loop;
the charging branch is connected with the capacitor C of the first current-limiting branch 1 Upper end connected with capacitor C 2 And thyristor T 9 Grounding, with the capacitor bearing size being as required by the current-limiting branch capacitor C 1 Determining the pressure bearing size;
the breaking branch consists of an IGBT group T 8 The phase-change circuit is connected with a metal oxide arrester MOA in parallel, is connected on a current-limiting branch in series, and forms a parallel branch with the current-limiting branch and is connected in parallel inside a bridge type of a phase-change branch.
According to the control method of the thyristor commutation matched resistance-inductance current-limiting hybrid high-voltage direct-current circuit breaker topology, the circuit breaker can work in the following three modes:
if the direct current breaker is arranged at the left end of the direct current transmission line, namely the current direction is rightward, firstly, the capacitor of the breaker is precharged, and the phase change branch Q is conducted 1 IGBT group T in transfer branch 3 And thyristor T 2 Thyristor T in charging branch 9 And phase-changing branch Q after charging 1 And thyristor T 9 Naturally shutting off;
a fault clearing mode: when abnormal current is detected, a fault clearing command is sent to the circuit breaker, and the phase change branch Q of the circuit breaker is immediately conducted 1 And a phase-changing branch Q 4 Thyristor T of transfer branch 2 IGBT group T for switching on/off branch circuit 8 The current-carrying branch is turned off, the current is quickly transferred from the current-carrying branch to the transfer branch, and the mechanical switch K is quickly opened 1 Wait for to reachCompleting brake opening after a rated opening distance; thyristor T for continuously conducting first branch of current-limiting branch 4 Capacitor C 1 Starting to discharge, thyristor T 2 After the current is cut off after the current bears the back voltage, the current is transferred to the first branch of the current limiting branch, and the capacitor C 1 Starting to charge in reverse direction, and turning on the thyristor T under the action of forward voltage 7 Adding a current-limiting inductor L 1 And a resistance R 1 At this time, due to the capacitance C 1 The charging current is gradually reduced to the thyristor T 4 Naturally turning off, and gradually transferring the current to the third branch of the current limiting branch; after the current limiting is completely put into use, if the system fault judgment is completed and the breaker receives a fault clearing command, the IGBT group T of the cut-off branch circuit is turned off 8 Switching MOA into the circuit for breaking and simultaneously conducting the second branch T of the current-limiting branch 6 Bypassing the inductive resistor, rapidly reducing the current due to the nonlinear characteristic of the MOA, and finishing fault clearing when the MOA is in a high-resistance state when the current is reduced to zero; to release the energy of the bypass inductor and resistor in the current-limiting branch, the thyristor T of the second branch of the current-limiting branch is switched on 5 Throw-in capacitor C 1 At this time, the thyristor T 6 Subject to the capacitor C having been charged in reverse 1 Is turned off by the back voltage of the current limiting branch 5 And a capacitor C 1 The third branch is connected in series to form an energy discharge loop;
and (3) current limiting recovery mode: if the system judges that the fault clearing is not needed, the current recovery is needed, and the circuit breaker receives the current-limiting recovery command and then conducts the thyristor T of the transfer branch 2 And thyristor T of the second branch of the current-limiting branch 6 Bypassing the inductor and the resistor of the current limiting branch, and transferring the current from the third branch of the current limiting branch to the transfer branch; then UFD is switched on, current-carrying branch is switched on after switching-on is completed, and IGBT group T of transfer branch is switched off 3 At this time, the current is completely restored to the current-carrying branch circuit, and then the thyristor T of the second branch of the current-limiting branch circuit is conducted 5 Input capacitance C 1 Discharging energy from the inductor;
maintenance and power-off mode: if the line needs to be maintained and powered off, the system sends a line maintenance command to the breaker, and the breaker transfers current to the breakerAfter the branch is transferred, the IGBT group T of the disjunction branch is turned off directly after the UFD is switched off without current limiting 8 Adding MOA to perform a breaking process.
Referring to the attached figure 1, the invention provides a detailed topological schematic diagram of a resistance-inductance current-limiting type hybrid high-voltage direct-current circuit breaker based on thyristor commutation matching, wherein the topological structure mainly comprises 6 branches: the device comprises a current-carrying branch, a phase-changing branch, a transfer branch, a current-limiting branch, a charging branch and a breaking branch.
Referring to fig. 2, in one example, a dc circuit breaker is placed at the left end of a dc transmission line, and in normal operation of the dc transmission line, current flows directly from the left end of the circuit breaker to the right end of the circuit breaker through a current carrying branch comprising a mechanical switch K 1 And IGBT group T 1 。
Referring to fig. 3, before any working mode, the invention precharges the internal capacitor and turns on the commutation branch Q 1 IGBT group T 3 Thyristor T 2 Thyristor T 9 The current flows from the left end of the DC breaker through the phase-changing branch Q 1 Branch line T 3 Thyristor T 2 Capacitor C of current-limiting branch 1 And thyristor T of charging branch 9 Capacitor C 2 To ground, to the capacitor C 1 Charging is carried out, at this time, the capacitor C 1 The voltages at the two ends are negative at the top and positive at the bottom. The capacitance C can be changed according to the actual current limiting requirement 2 Thereby changing the capacitance C 1 The voltage across (c).
Referring to fig. 4, the dc circuit breaker of the present invention operates in a fault clearing mode. The dark color path is a current circulation path of each step time sequence:
in fig. 4 (a), when abnormal current is detected, a fault clearing command is sent to the direct current circuit breaker, and the circuit breaker commutation branch Q is immediately conducted 1 And a phase-changing branch Q 4 Thyristor T of transfer branch 2 IGBT group T for switching on/off branch circuit 8 The load transfer switch LCS of the current-carrying branch is switched off, the current is quickly transferred from the current-carrying branch to the transfer branch, and the quick opening mechanical switch K is simultaneously used 1 Completing the brake opening after the rated opening distance is reached;
FIG. 4 (b) shows a thyristor T for conducting the first branch of the current limiting branch 4 Capacitor C 1 Starting discharge, thyristor T 2 After the current is cut off after the current bears the back voltage, the current is transferred to the first branch of the current limiting branch, and the capacitor C 1 Begins to charge reversely, at this time, the capacitor C 1 The voltages at the two ends are positive and negative;
FIG. 4 (c), the thyristor T is turned on under the action of the forward voltage 7 Adding a current-limiting inductor L 1 And a resistance R 1 At this time, the capacitance C 1 The charging current is gradually reduced to the thyristor T 4 Naturally turning off, and gradually transferring the current to the third branch of the current limiting branch;
fig. 4 (d), after the current limiting is completely put into operation, that is, the current completely flows through the third branch of the current limiting branch, and waits for receiving the fault clearing command;
fig. 4 (e), at this time, if the system determines that the fault needs to be cleared, and the breaker receives the fault clearing command, the open branch T is turned off 8 Switching on MOA to break and simultaneously turn on thyristor T of second branch of current-limiting branch 6 Bypassing the inductance resistor, wherein the current is rapidly reduced due to the nonlinear characteristic of the MOA, and when the current is reduced to zero, the MOA is in a high-resistance state, and the fault clearing is finished;
FIG. 4 (f) shows the thyristor T of the second branch of the current-limiting branch being turned on to discharge the energy of the shunt inductor and resistor in the current-limiting branch 5 Input capacitance C 1 At this time, the thyristor T 6 Subject to the capacitor C having been charged in reverse 1 Is turned off by the back pressure of the current limiting branch 5 And a capacitor C 1 The third branch in series connection forms an energy discharge loop.
Referring to fig. 5, the present invention operates in a current limited recovery mode. The dark path is a current circulation path of each step time sequence:
fig. 5 (a-d), the working sequence steps based on the fault clearing manner are as shown in fig. 4 (a-d), if the circuit breaker completely enters the current limiting, the system judges that the fault clearing is not needed, and the current recovery is needed;
FIG. 5 (e) shows the circuit breaker receiving current limitingAfter the recovery command, the thyristor T of the transfer branch is switched on 2 And a thyristor T of a second branch of the current-limiting branch 6 The current is shunted by the inductor and the resistor of the current-limiting branch, and the current is transferred to the transfer branch from the third branch of the current-limiting branch;
FIG. 5 (f), then closing K 1 After closing, the load transfer switch LCS of the current-carrying branch is switched on, and the IGBT group T of the transfer branch is switched off 3 At this time, the current is completely restored to the current-carrying branch circuit, and then the thyristor T of the second branch of the current-limiting branch circuit is conducted 5 Input capacitance C 1 And discharging energy from the inductor.
Referring to fig. 6, the present invention operates in a service power off mode. The dark path is a current circulation path of each step time sequence:
fig. 6 (a) shows that if the line needs to be maintained and powered off, the system sends a line maintenance command to the breaker, the breaker transfers the current to the transfer branch, and the working sequence steps of the transfer step based on the fault clearing mode are shown in fig. 4;
fig. 6 (b), then, the IGBT group T of the segment branch is turned off directly after the opening without current limiting 8 Adding MOA to perform a breaking process.
The invention is applicable to the prior art, where nothing is said.
Claims (6)
1. A resistive-inductive current-limiting hybrid high-voltage direct current circuit breaker topology, comprising: the device comprises a current-carrying branch, a phase-changing branch, a transfer branch, a current-limiting branch, a charging branch and a breaking branch;
the two ends of the current-carrying branch are respectively connected with the direct-current line interface, and the current-carrying branch is connected with the mechanical switch UFD and the load transfer switch LCS in series, wherein the load transfer switch LCS is formed by two groups of IGBTs in anti-series connection;
the phase change branches are totally four groups, each phase change branch is formed by connecting a thyristor and a plurality of diodes in series, the four groups of phase change branches are arranged in the upward direction of a current outlet and are respectively arranged at two sides, the phase change branches at the same side are connected end to end, the phase change branches at different sides are directly connected, meanwhile, the end to end part of each side is respectively connected with a corresponding interface of a direct current circuit, and the whole phase change branch forms a bridge structure;
the transfer branch is formed by connecting a plurality of IGBT groups and thyristors in series and is connected in the bridge structure of the phase change branch;
the current limiting branch circuit is connected with the transfer branch circuit in parallel and consists of three parallel branch circuits, wherein the first branch circuit is a branch circuit formed by connecting a thyristor and a plurality of diodes in series and then connecting the thyristors in anti-parallel and connecting the thyristors in series with a capacitor, the second branch circuit is a branch circuit formed by connecting an inductor in parallel with a resistor and then connecting the resistor in series with the thyristor, and the third branch circuit is a branch circuit formed by connecting an inductor in parallel with a resistor and then connecting the resistor in series with the thyristor;
the charging branch circuit is formed by grounding a capacitor and a thyristor in series and is connected to the upper end of the capacitor of the first current-limiting branch circuit;
the breaking branch consists of an IGBT group T 8 The phase-change circuit is connected with a phase-change branch in a bridge type, and is connected with a metal oxide arrester MOA in parallel, connected in series on a current-limiting branch, and connected in parallel inside the phase-change branch after being connected in series with the current-limiting branch.
2. The topology of claim 1, wherein the commutation branches comprise four groups, each group being Q 1 、Q 2 、Q 3 、Q 4 The number of the diodes connected in series with each group of the commutation branch circuit and the current limiting branch circuit is determined according to the actual maximum voltage and current.
3. The topology of claim 1, wherein IGBT group T in the transfer branch 3 And thyristor T 2 Series connected with IGBT group T of cut-off branch 8 A current path is formed.
4. The topology of claim 1, wherein the charging branch is connected to the capacitor C of the first current limiting branch 1 Upper end connected with capacitor C 2 And thyristor T 9 Grounding and charging branch capacitor C 2 Pressure-bearing capacitance C with current-limiting branch circuit according to requirements 1 And (4) determining the pressure bearing size.
5. The topology of claim 1, wherein an inductance L in a third branch of a current limiting branch is an inductance L in the third branch 1 And a resistance R 1 Parallel connection with thyristor T 7 In series and a second branch circuit thyristor T 6 The third branch is connected in anti-parallel to form a bypass loop, and the first branch thyristor T 4 After natural shut-off, the thyristor T 5 And a capacitor C 1 The series connection and the third branch form an energy discharge loop.
6. The control method of the topology of the choke-sense current-limiting hybrid high-voltage direct current circuit breaker according to any one of claims 1 to 5, wherein the circuit breaker operates in three modes:
if the circuit breaker is placed at the left end of the direct current transmission line, namely the current direction is rightward, the capacitor of the circuit breaker is precharged firstly, and the phase change branch Q is conducted 1 IGBT group T in transfer branch 3 And thyristor T 2 Thyristor T in charging branch 9 And phase-changing branch Q after charging 1 And thyristor T 9 Naturally shutting off;
a fault clearing mode: when abnormal current is detected, a fault clearing command is sent to the circuit breaker, and the phase change branch Q of the circuit breaker is immediately conducted 1 And a phase-changing branch Q 4 Thyristor T of transfer branch 2 IGBT group T for switching on/off branch circuit 8 The current-carrying branch is turned off, the current is quickly transferred from the current-carrying branch to the transfer branch, and the mechanical switch K is quickly opened 1 Completing the brake opening after the rated opening distance is reached; thyristor T for continuously conducting first branch of current-limiting branch 4 Capacitor C 1 Starting discharge, thyristor T 2 After the current is cut off after the current bears the back voltage, the current is transferred to the first branch of the current limiting branch, and the capacitor C 1 Starting to charge in reverse direction, and turning on the thyristor T under the action of forward voltage 7 Adding a current-limiting inductor L 1 And a resistance R 1 At this timeDue to the capacitance C 1 The charging current is gradually reduced to the thyristor T 4 Naturally turning off, and gradually transferring the current to the third branch of the current limiting branch; after the current limiting is completely put into use, if the system fault judgment is completed and the breaker receives a fault clearing command, the IGBT group T of the cut-off branch is turned off 8 Switching MOA into the circuit for breaking and simultaneously conducting the second branch T of the current-limiting branch 6 Bypassing the inductive resistor, rapidly reducing the current due to the nonlinear characteristic of the MOA, and finishing fault clearing when the MOA is in a high-resistance state when the current is reduced to zero; to release the energy of the bypass inductor and resistor in the current-limiting branch, the thyristor T of the second branch of the current-limiting branch is switched on 5 Input capacitance C 1 At this time, the thyristor T 6 Subject to the capacitor C having been charged in reverse 1 Is turned off by the back voltage of the thyristor T of the first branch of the current-limiting branch 5 And a capacitor C 1 The third branch is connected in series to form an energy discharge loop;
and (3) current limiting recovery mode: if the system judges that the fault clearing is not needed, the current recovery is needed, and after the circuit breaker receives the current-limiting recovery command, the thyristor T of the transfer branch is conducted 2 And thyristor T of the second branch of the current-limiting branch 6 The current limiting branch circuit is bypassed by an inductor and a resistor, and the current is transferred to a transfer branch circuit from a third branch of the current limiting branch circuit; then UFD is switched on, the current-carrying branch is switched on after the switching-on is finished, and the IGBT group T of the transfer branch is switched off 3 At this time, the current is completely restored to the current-carrying branch circuit, and then the thyristor T of the second branch of the current-limiting branch circuit is conducted 5 Input capacitance C 1 Discharging energy from the inductor;
maintenance and power-off mode: if the line needs to be maintained and powered off, the system sends a line maintenance command to the breaker, the breaker does not need to carry out current limiting after the current is transferred to the transfer branch, the UFD brake opening is directly finished, and the IGBT group T of the breaking branch is switched off 8 Adding MOA to perform a breaking process.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116260118A (en) * | 2023-04-03 | 2023-06-13 | 国网江苏省电力有限公司南通供电分公司 | Hybrid direct current breaker with current limiting function and control method thereof |
| CN117955062A (en) * | 2024-03-26 | 2024-04-30 | 法泰电器（江苏）股份有限公司 | Coupling inductance current-limiting type hybrid direct current breaker and application method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116260118A (en) * | 2023-04-03 | 2023-06-13 | 国网江苏省电力有限公司南通供电分公司 | Hybrid direct current breaker with current limiting function and control method thereof |
| CN116260118B (en) * | 2023-04-03 | 2023-09-22 | 国网江苏省电力有限公司南通供电分公司 | Hybrid direct current breaker with current limiting function and control method thereof |
| CN117955062A (en) * | 2024-03-26 | 2024-04-30 | 法泰电器（江苏）股份有限公司 | Coupling inductance current-limiting type hybrid direct current breaker and application method thereof |
| CN117955062B (en) * | 2024-03-26 | 2024-07-02 | 法泰电器（江苏）股份有限公司 | Coupling inductance current-limiting type hybrid direct current breaker and application method thereof |
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