CN115102135A - Thyristor-based low-loss bidirectional direct-current solid-state circuit breaker and control method thereof - Google Patents
Thyristor-based low-loss bidirectional direct-current solid-state circuit breaker and control method thereof Download PDFInfo
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- H—ELECTRICITY
- 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
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- 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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a thyristor-based low-loss bidirectional direct-current solid-state circuit breaker and a control method thereof. When the bidirectional direct current solid-state circuit breaker works normally, the main branch current only passes through one semiconductor device, the on-state loss is low, the turn-off is controllable, and the reliability is high. The invention has simple control algorithm and can effectively realize the monitoring of the current and the judgment of the type of the short-circuit fault.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a low-loss bidirectional direct-current solid-state circuit breaker based on a thyristor.
Background
With the development of distributed power sources such as photovoltaic power generation and wind power generation, the direct-current micro-grid has received more and more attention as a higher-efficiency access form. Compared with alternating current, direct current has better economical efficiency and wider development prospect. In the aspect of power transmission, direct current transmission has the advantages of high efficiency and low loss. However, because direct current lacks of natural zero crossing points, how to effectively realize fault isolation of a direct current power grid restricts the development of direct current. The current direct current circuit breaker is an effective method for solving the problem at present. However, the conventional direct current circuit breaker has the problems of long turn-off time, complex circuit structure, electric arc, low reliability and anti-interference performance and the like, and the solid state circuit breaker based on the solid state power electronic device receives more and more attention due to the advantages of low loss, low cost, simple structure and the like.
The Z-source solid-state circuit breaker and the derived topological structure thereof are common solid-state circuit breakers at present, have simple circuit structures, do not need additional fault detection and control circuits, and can realize the interruption and isolation of short-circuit faults, but the performance of the Z-source solid-state circuit breaker is greatly influenced by factors such as loads, line impedance and the like, so the application of the Z-source solid-state circuit breaker in practice is restricted. In order to enhance the reliability of the circuit breaker and reduce the influence of circuit parameters on the performance of the circuit breaker, and simultaneously to meet the requirements of the direct-current microgrid on bidirectional energy flow and bidirectional fault protection, Chinese patent (202011145187.6) and Chinese patent (201911098557.2) propose two bidirectional direct-current solid-state circuit breakers based on thyristors, and the two bidirectional direct-current solid-state circuit breakers have the advantages of controllable turn-off, high reliability, high response speed and the like, but when the circuit normally works, the current needs to pass through two semiconductor devices, and the on-state loss is relatively large. The documents "A Low-Loss Z-Source Circuit Breaker for LVDC Systems, in IEEE Journal of emitting and Selected diodes in Power Electronics, vol.9, No.3, pp.2518-2528, June 2021" by Y.Yang and C.Huang propose a Low-Loss bidirectional DC solid-state Circuit Breaker, but the Circuit Breaker is still based on a Z Source structure, and has Low stability and high possibility of false triggering.
Disclosure of Invention
Aiming at the defects of the existing bidirectional direct current solid-state circuit breaker, the invention provides a thyristor-based low-loss bidirectional direct current solid-state circuit breaker, which can realize bidirectional flow of energy and bidirectional interruption and isolation of faults and has the characteristics of controllability, high stability, high response speed, low on-state loss and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the topological structure of the thyristor-based low-loss bidirectional direct-current solid-state circuit breaker comprises a main branch, a commutation and capacitance charging branch, an energy absorption branch and a control unit, and is shown in fig. 1. The main branch is a first thyristor (SCR) 1 ) A second thyristor (SCR) 2 ) And a coupled inductor primary coil (L) w1 ) The commutation and capacitor charging branch is formed by a first diode (D) 1 ) A second diode (D) 2 ) A third thyristor (SCR) 3 ) And a fourth thyristor (SCR) 4 ) The fifth thyristor (SCR) 5 ) And a sixth thyristor (SCR) 6 ) A capacitor (C), a secondary coil (L) of a coupled inductor w2 ) The energy absorption branch consists of a piezoresistor (MOV), and the control unit consists of a current sensor and a controller.
The method is characterized in that: the first thyristor (SCR) 1 ) And a second thyristor (SCR) 2 ) A first thyristor (SCR) connected in reverse parallel to form a bidirectional current branch 1 ) An anode and a second thyristor (SCR) 2 ) Cathode connected, first thyristor (SCR) 1 ) Cathode and second thyristor anode (SCR) 2 ) Connected, a first thyristor (SCR) 1 ) Cathode and coupling inductor primary coil (L) w1 ) The homonymous terminals of (2) are connected; the first diode (D) 1 ) Positive pole and first thyristor (SCR) 1 ) Anode connected, first diode (D) 1 ) A cathode and a second diode (D) 2 ) Negative pole connected to a second diode (D) 2 ) Positive pole and coupling inductance secondary coil (L w2 ) A third thyristor (SCR) connected to the different name terminal 3 ) Anode and fifth thyristor (SCR) 5 ) Anode connected, third thyristor (SCR) 3 ) Cathode and fourth thyristor (SCR) 4 ) Anode connected, fourth thyristor (SCR) 4 ) Cathode and sixth thyristor (SCR) 6 ) Cathode connected, sixth thyristor (SCR) 6 ) Anode and fifth thyristor (SCR) 5 ) Cathode connection, coupling of inductive secondary coil (L) w2 ) Homonymous terminal and fifth thyristor (SCR) 5 ) Cathode and sixth thyristor (SCR) 6 ) Anode connected, coupled with an inductive secondary (L) w2 ) Different name terminal and third thyristor (SCR) 3 ) Cathode and fourth thyristor (SCR) 4 ) Anode connected, positive pole of capacitor (C) and fifth thyristor (SCR) 5 ) Anode connected, negative pole of capacitor (C) and sixth thyristor (SCR) 6 ) One end of the resistor (R) is connected with the cathode of the capacitor (C), and the other end of the resistor (R) is connected with the cathode of the power supply; one end of the voltage dependent resistor (MOV) and the first thyristor (SCR) 1 ) An anode and a first diode (D) 1 ) Positive connection, the other end of the varistor (MOV) and the primary winding (L) of the coupling inductor w1 ) Different name terminal and second diode (D) 2 ) Connecting the positive electrodes; the main loop current flows through the current sensor, the output end of the current sensor is connected with the controller, and the output end of the controller is connected with the first (SCR) 1 ) Second (SCR) 2 ) The third (SCR) 3 ) And fourth (SCR) 4 ) Fifth (SCR) 5 ) And a sixth thyristor (SCR) 6 ) Is connected to the gate of (c).
The thyristor-based low-loss bidirectional direct-current solid-state circuit breaker can realize bidirectional interruption and isolation of bidirectional flow of energy and short-circuit faults. First thyristor (SCR) 1 ) Primary coil (L) of coupled inductor w1 ) A main branch of the forward flow path, a first diode (D), constituting the energy of said bidirectional circuit breaker 1 ) And the fifth thyristor (SCR) 5 ) Coupled inductor secondary coil (L) w2 ) And a fourth thyristor (SCR) 4 ) The capacitor (C) and the resistor (R) form a current conversion and capacitor charging branch circuit when the energy of the bidirectional circuit breaker flows forward; second thyristor (SCR) 2 ) And the coupling inductorStage coil (L) w1 ) A second diode (D) forming a main branch for backward energy circulation of the circuit breaker 2 ) A third thyristor (SCR) 3 ) Secondary coil (L) of coupled inductor w2 ) And a sixth thyristor (SCR) 6 ) The capacitor (C) and the resistor (R) form a commutation and capacitor charging branch circuit when the energy of the bidirectional circuit breaker flows backwards; a voltage dependent resistor (MOV) is an energy absorption loop when the energy of the bidirectional breaker flows forwards and backwards; the current sensor and the controller are control units when the energy of the bidirectional circuit breaker flows forwards and backwards.
The control method of the thyristor-based low-loss bidirectional direct-current solid-state circuit breaker is characterized by comprising the following steps of: comprises the following steps:
output current of I O Setting the reference current value as I ref1 、I ref2 ，I ref1 <I ref2 Output current and reference current I ref1 The difference is:
ΔI＝I O -I ref1 (1)
when a fault occurs:
the method comprises the following steps: when Δ I>Starting to continuously monitor the output current I at 0 O The size of (a) is (b),
step two: when outputting current I O Has a value of greater than I ref2 And duration T(s) is greater than T delay I.e. I O -I ref2 >Duration t(s) 0>T delay Then the controller gives SCR to the thyristor 4 And SCR 5 (in reverse operation: SCR) 3 And SCR 6 ) The gate sends a trigger signal to turn on the gate, thereby causing the capacitor C, SCR 5 Secondary coil L of coupled inductor w2 And SCR 4 (in reverse operation: capacitor C, SCR 3 Coupling inductor secondary coil L w2 And SCR 6 ) And a commutation loop is formed, so that the short-circuit fault is isolated.
When the breaker is conducted again: setting the minimum time interval between circuit breaker turn-off and circuit breaker re-conduction to T 0 The time required for charging the capacitor is T 1 Then the breaker goes from off to breakerThe time interval between re-conduction should be greater than the charging time of the capacitor C, i.e. T 0 >T 1 。
When working in reverse, when the output current I O Has a value of greater than I ref2 And duration T(s) is greater than T delay I.e. I O -I ref2 >Duration t(s) of 0>T delay When the controller gives SCR to the thyristor 3 And SCR 6 The gate sends a trigger signal to turn on the gate, thereby causing the capacitor C, SCR 5 Secondary coil L of coupled inductor w2 And SCR 6 And a commutation loop is formed, so that the isolation of short-circuit faults is realized.
When the breaker is conducted again: setting the minimum time interval between circuit breaker turn-off and circuit breaker re-conduction to T 0 The time required for charging the capacitor is T 1 The time interval between the switch-off of the circuit breaker and the switch-back of the circuit breaker should then be greater than the charging time of the capacitor C, i.e. T 0 >T 1 。
Step three: t for turning off the breaker when short-circuit fault occurs 0 After time, the controller gives the thyristor SCR 1 (in reverse operation: SCR) 2 ) And the gate pole sends a trigger signal to enable the breaker to be switched on, the first step and the second step are repeated, if the breaker is switched off again, the permanent fault is judged, the breaker is not switched on again until the fault is completely cleared, and otherwise, the transient fault is judged.
When working in reverse, the breaker is turned off T when short-circuit fault occurs 0 After time, the controller gives the thyristor SCR 2 And the gate pole sends a trigger signal to enable the breaker to be switched on, the first step and the second step are repeated, if the breaker is switched off again, the permanent fault is judged, the breaker is not switched on again until the fault is completely cleared, and otherwise, the transient fault is judged.
The invention can realize the following beneficial effects:
1) when the circuit of the bidirectional circuit breaker normally works, current only flows through one thyristor, and the on-state loss of the system is greatly reduced;
2) the bidirectional circuit breaker adopts the controller to detect the current, so that the controllability of the circuit breaker is enhanced, the reliability of the circuit breaker is improved, and the possibility of false triggering of the circuit breaker is reduced;
3) the bidirectional circuit breaker can realize the pre-charging of the capacitance of the current conversion branch circuit and realize the protection of the circuit when the circuit is electrified;
4) the bidirectional circuit breaker is additionally provided with a current detection and controller, so that the switching function can be realized;
5) when the fault current is cut off, large current cannot be fed back to the power supply end;
6) the judgment of the fault type can be realized by utilizing the re-guiding on-off circuit breaker.
Drawings
One or more embodiments are illustrated in the accompanying drawings, which correspond to the accompanying drawings, and which are not to be considered limiting of the embodiments, in which elements having the same reference numerals are shown as similar elements, and not limiting of the scale, and in which:
FIG. 1 is a diagram of the circuit topology of the present invention;
FIG. 2 is a timing diagram illustrating the operation of the present invention when a load short-circuit fault occurs;
FIG. 3 is a flow chart of a control method during fault isolation;
FIG. 4 is a flowchart of a control method for determining a fault type during a reboot;
FIG. 5 is a timing diagram illustrating operation of the present invention when used as a switch;
FIG. 6 is a waveform diagram of output current, capacitor voltage and capacitor current when a load short circuit fault is simulated;
fig. 7 is a waveform diagram of load voltage and load current when the load is powered off by performing a switching function in an analog simulation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application.
It should be apparent that the drawings in the following description are merely examples or embodiments of the present application, and that it is obvious to those skilled in the art that the present application can also be applied to other similar situations according to the drawings without inventive efforts. Moreover, it should be appreciated that such a development effort might be complex and tedious, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without departing from the scope of the present disclosure.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The use of the terms "including," "comprising," "having," and any variations thereof herein, is intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to those listed, but may include additional steps or elements not listed, or may include additional steps or elements inherent to such process, method, article, or apparatus.
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention discloses a bidirectional direct current solid-state circuit breaker based on a thyristor, which is shown in figure 1, and the topological structure of the bidirectional direct current solid-state circuit breaker based on the thyristor consists of a main branch circuit, a commutation and capacitor charging branch circuit, an energy absorption branch circuit and a control unit. The main branch is a first thyristor (SCR) 1 ) A second thyristor (SCR) 2 ) And a primary coil (L) of a coupling inductor w1 ) The commutation and capacitor charging branch is formed by a first diode (D) 1 ) A second diode (D) 2 ) A third thyristor (SCR) 3 ) The fourth thyristor (SCR) 4 ) And the fifth thyristor (SCR) 5 ) And a sixth thyristor (SCR) 6 ) A capacitor (C), a secondary coil (L) of a coupled inductor w2 ) The energy absorption branch consists of a voltage dependent resistor (MOV), and the control unit consists of a current sensor and a controller.
The specific working principle of the thyristor-based low-loss bidirectional direct-current solid-state circuit breaker and the control method thereof provided by the invention is described as follows by taking forward work as an example:
first thyristor (SCR) when the circuit breaker energy flows forward 1 ) Primary coil (L) of coupled inductor w1 ) A forward flow path main branch constituting the bidirectional breaker energy; a first diode (D) 1 ) And the fifth thyristor (SCR) 5 ) A secondary coil (L) of a coupled inductor w2 ) And a fourth thyristor (SCR) 4 ) The capacitor (C) and the resistor (R) form a current conversion and capacitor charging branch circuit when the energy of the bidirectional circuit breaker flows forward; a voltage dependent resistor (MOV) is an energy absorption branch; the current sensor and the controller are control units. At this time, a first thyristor (SCR) 1 ) In the on state, Second (SCR) 2 ) The third (SCR) 3 ) And fourth (SCR) 4 ) Fifth (SCR) 5 ) And a sixth thyristor (SCR) 6 ) In the off state, the power supply passes through the first diode (D) 1 ) The capacitor (C) is charged to a voltage equal to the supply voltage.
As shown in fig. 2 and 3, the circuit breaker performs a short-circuit faultAnd (4) isolating. When the load is at t 0 When short circuit fault happens at any time, current I is output O In a rising trend when outputting a current I O And a reference current I ref1 When the difference Δ I is greater than 0, the output current I starts to be continuously monitored O When the output current I is large or small O Has a value of greater than I ref2 And duration T(s) is greater than T delay I.e. I O -I ref2 >0 duration greater than T delay While, the controller feeds a fifth thyristor (SCR) 5 ) Gate and fourth thyristor (SCR) 4 ) The gate pole sends a trigger signal to turn on the capacitor (C) and the fifth thyristor (SCR) 5 ) Secondary coil (L) of coupled inductor w2 ) And a fourth thyristor (SCR) 4 ) Forming a path, discharging the capacitor (C), passing a transient large current through the fifth thyristor (SCR) 5 ) And a fourth thyristor (SCR) 4 ) And flows through the secondary coil (L) of the coupled inductor w2 ) When the primary coil (L) of the inductor is coupled w1 ) Will generate a reverse induced current at t 3 Flowing through a first thyristor (SCR) 1 ) Is reduced to 0, at which time the first thyristor (SCR) 1 ) And (4) shutting down and removing the fault. Then the voltage dependent resistor (MOV) absorbs the energy stored in the coupled inductor, and the power supply passes through the first diode (D) again 1 ) The capacitor is charged (C) to a voltage equal to the supply voltage in preparation for the next turn-off.
As shown in fig. 4, when a short-circuit fault occurs, causing the circuit breaker to be turned off T 0 After time, the controller gives the thyristor SCR 1 The gate sends a trigger signal to turn on the circuit breaker, and the fault detection and isolation steps shown in fig. 2 and 3 are performed again, if the circuit breaker is turned off again, the circuit breaker is judged to be a permanent fault, and the circuit breaker is not turned on again until the fault is completely cleared, otherwise, the circuit breaker is judged to be an instantaneous fault.
As shown in fig. 5, the circuit breaker is used as a switch to cut off power to a load. At t 0 Before time, the circuit is operating normally, at t 0 At all times, the controller gives the fifth thyristor (SCR) 5 ) Gate and fourth thyristor (SCR) 4 ) The gate electrode sending a trigger signal to turn it on, and the likeTime capacitor (C), fifth thyristor (SCR) 5 ) Secondary coil (L) of coupled inductor w2 ) And a fourth thyristor (SCR) 4 ) Forming a path, discharging the capacitor (C), passing a transient large current through the fifth thyristor (SCR) 5 ) And a fourth thyristor (SCR) 4 ) And flows through the coupled inductor secondary coil (L) w2 ) When the primary coil (L) of the inductor is coupled w1 ) Will generate a reverse induced current, thereby causing the first thyristor (SCR) 1 ) Off, the load voltage and load current are reduced to 0.
Aiming at the example, a simulation experiment is carried out in PLECS simulation software, and the controllable bidirectional direct current solid-state circuit breaker based on the thyristor is verified. The forward flow of breaker energy is described here as an example. The simulated power supply voltage is 200V, the load is 10 omega, the capacitance is 100uF, the resistance is 40 omega, and the inductance values of the primary coil and the secondary coil of the coupling inductor are 900uH and 100uH respectively.
Example one: simulation load short circuit fault
The simulation waveform is shown in fig. 6, and when the setting is that short-circuit fault occurs when t is 10s, the system outputs current and flows through the first thyristor (SCR) 1 ) When the current sensor recognizes that the output current meets the fault protection condition, the controller outputs a control signal to turn on a fifth thyristor (SCR) 5 ) And a fourth thyristor (SCR) 4 ) At this point the capacitor discharges (C), the capacitor voltage drops, releasing a transient large current that flows through the coupled inductor secondary (L) w2 ) At the primary coil (L) of the coupling inductor w1 ) Induce a large reverse current to make the first thyristor (SCR) 1 ) And (4) switching off, and finally realizing short-circuit fault isolation. After the short-circuit fault is cut off, the power supply charges the capacitor (C).
Example two: simulation disconnection load
The simulation waveform is shown in fig. 7, and when t is 10s, the controller outputs a control signal to a fifth thyristor (SCR) 5 ) Gate and fourth thyristor (SCR) 4 ) The gate is switched on, the capacitor (C) discharges, a large instantaneous current is discharged and flows through the secondary coil (L) of the coupling inductor w2 ) At the primary coil (L) of the coupling inductor w1 ) Induce a large reverse current to make the first thyristor (SCR) 1 ) And (4) switching off, and finally realizing load power failure.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a low-loss bidirectional direct current solid state circuit breaker based on thyristor which characterized in that: comprises a main branch, a commutation and capacitor charging branch, an energy absorption branch and a control unit,
the main branch is a first thyristor SCR 1 The second thyristor SCR 2 And a coupling inductor primary coil L w1 Composition is carried out;
the commutation and capacitor charging branch is a first diode D 1 A second diode D 2 And a third thyristor SCR 3 And a fourth thyristor SCR 4 And a fifth thyristor SCR 5 And a sixth thyristor SCR 6 Capacitor C, coupling inductor secondary coil L w2 And a resistor R;
the energy absorption branch is composed of a piezoresistor MOV;
the control unit consists of a current sensor and a controller.
2. A thyristor-based low-loss bidirectional direct current solid state circuit breaker according to claim 1, wherein: the first thyristor SCR 1 And a second thyristor SCR 2 A first thyristor SCR connected in reverse parallel to form a bidirectional current branch 1 Anode and second thyristor SCR 2 Cathode connected, first thyristor SCR 1 Cathode and second thyristor anode SCR 2 Connected, first thyristor SCR 1 Cathode and coupling inductor primary coil L w1 The homonymous terminals of the two terminals are connected; the first diode D 1 Positive electrodeAnd a first thyristor SCR 1 Anode connected, a first diode D 1 Cathode and second diode D 2 Negative pole connected, second diode D 2 Positive pole and coupling inductance secondary coil L w2 A third thyristor SCR connected to the different name terminal 3 Anode and fifth thyristor SCR 5 Anode connected, third thyristor SCR 3 Cathode and fourth thyristor SCR 4 Anode connected, fourth thyristor SCR 4 Cathode and sixth thyristor SCR 6 Cathode connected, sixth thyristor SCR 6 Anode and fifth thyristor SCR 5 Cathode connected, coupled with an inductive secondary coil L w2 Homonymous terminal and fifth thyristor SCR 5 Cathode and sixth thyristor SCR 6 Anode connected, coupled inductive secondary L w2 Different name terminal and third thyristor SCR 3 Cathode and fourth thyristor SCR 4 Anode connected, capacitor C anode and fifth thyristor SCR 5 Anode connected, capacitor C cathode and sixth thyristor SCR 6 One end of the resistor R is connected with the negative electrode of the capacitor C, and the other end of the resistor R is connected with the negative electrode of the power supply; one end of the voltage dependent resistor MOV and the first thyristor SCR 1 Anode and first diode D 1 Positive connection, another end of varistor MOV and primary coil L of coupling inductor w1 Different name terminal and second diode D 2 Connecting the positive electrodes; the main loop current flows through the current sensor, the output end of the current sensor is connected with the controller, and the output end of the controller is connected with the first SCR 1 A second SCR 2 And the third SCR 3 And the fourth SCR 4 The fifth SCR 5 And a sixth thyristor SCR 6 Is connected to the gate of (1).
3. A thyristor-based low-loss bidirectional direct current solid state circuit breaker according to claim 1, wherein: first thyristor SCR 1 Primary coil L of coupled inductor w1 A main branch of forward flow channel, a first diode D, constituting the energy of said bidirectional circuit breaker 1 And a fifth thyristor SCR 5 Secondary coil L of coupled inductor w2 And a fourth thyristor SCR 4 The capacitor C and the resistor R form the bidirectional circuitA current conversion and capacitor charging branch circuit when the energy of the circuit breaker flows forward; second thyristor SCR 2 Primary coil L of coupled inductor w1 A second diode D for circulating the main branch circuit after the energy of the circuit breaker is back 2 And a third thyristor SCR 3 Secondary coil L of coupled inductor w2 And a sixth thyristor SCR 6 The capacitor C and the resistor R form a current conversion and capacitor charging branch circuit when the energy of the bidirectional circuit breaker flows backwards; the voltage dependent resistor MOV is an energy absorption loop when the energy of the bidirectional breaker flows forwards and backwards; the current sensor and the controller are control units when the energy of the bidirectional circuit breaker flows forwards and backwards.
4. A method of controlling a thyristor-based low-loss bidirectional direct current solid state circuit breaker according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
output current of I O Setting the reference current value as I ref1 、I ref2 ，I ref1 <I ref2 Output current and reference current I ref1 The difference is:
ΔI＝I O -I ref1
when a fault occurs:
the method comprises the following steps: when Δ I>Starting to continuously monitor the output current I at 0 O The size of (a) is (b),
step two: when outputting current I O Has a value of greater than I ref2 And duration T(s) is greater than T delay When is, I O -I ref2 >Duration t(s) of 0>T delay When the controller gives SCR to the thyristor 4 And SCR 5 The gate sends a trigger signal to turn on the gate, thereby causing the capacitor C, SCR 5 Secondary coil L of coupled inductor w2 And SCR 4 And a commutation loop is formed, so that the isolation of short-circuit faults is realized.
When the breaker is conducted again:
setting the minimum time interval between circuit breaker turn-off and circuit breaker re-conduction to T 0 The time required for charging the capacitor is T 1 Then circuit breakerThe time interval from switch-off to switch-on of the circuit breaker should be greater than the capacitance C 1 Charging time of, i.e. T 0 >T 1 。
Step three: t for turning off the breaker when short-circuit fault occurs 0 After time, the controller gives the thyristor SCR 1 And the gate pole sends a trigger signal to enable the breaker to be switched on, the first step and the second step are repeated, if the breaker is switched off again, the permanent fault is judged, the breaker is not switched on again until the fault is completely cleared, and otherwise, the transient fault is judged.
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| CN202210473067.1A CN115102135A (en) | 2022-04-29 | 2022-04-29 | Thyristor-based low-loss bidirectional direct-current solid-state circuit breaker and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115528659A (en) * | 2022-11-23 | 2022-12-27 | 武汉大学 | Direct current breaker with automatic and controllable turn-off capability and use method thereof |
| CN116111565A (en) * | 2023-02-21 | 2023-05-12 | 湖北工业大学 | Bidirectional solid-state circuit breaker |
-
2022
- 2022-04-29 CN CN202210473067.1A patent/CN115102135A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115528659A (en) * | 2022-11-23 | 2022-12-27 | 武汉大学 | Direct current breaker with automatic and controllable turn-off capability and use method thereof |
| CN115528659B (en) * | 2022-11-23 | 2023-03-10 | 武汉大学 | Direct current breaker with automatic and controllable turn-off capability and use method thereof |
| CN116111565A (en) * | 2023-02-21 | 2023-05-12 | 湖北工业大学 | Bidirectional solid-state circuit breaker |
| CN116111565B (en) * | 2023-02-21 | 2023-10-24 | 湖北工业大学 | Bidirectional solid-state circuit breaker |
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