CN115000919A - Bidirectional direct current solid-state circuit breaker based on thyristor and control method thereof - Google Patents
Bidirectional direct current solid-state circuit breaker based on thyristor and control method thereof Download PDFInfo
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- CN115000919A CN115000919A CN202210473995.8A CN202210473995A CN115000919A CN 115000919 A CN115000919 A CN 115000919A CN 202210473995 A CN202210473995 A CN 202210473995A CN 115000919 A CN115000919 A CN 115000919A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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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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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a controllable bidirectional direct current solid-state circuit breaker based on a thyristor and a control method thereof, wherein the bidirectional direct current solid-state circuit breaker comprises a main branch, a current conversion and capacitor charging branch, an energy absorption branch and a control unit. The method has the advantages of simple control algorithm, high reliability and strong practicability, and can judge the type of the short-circuit fault during the reconnection.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a 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 receives 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 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, low 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 thyristor-based bidirectional direct-current solid-state circuit breakers, which 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.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a verification and test method for a contactor relay fault diagnosis and health management technology. A series of PHM technical verification and test work aiming at electromagnetic switch devices such as a contactor, a relay and the like can be completed by utilizing the verification and test method provided by the invention.
Aiming at the defects of the existing bidirectional direct current solid-state circuit breaker, the invention provides a bidirectional direct current solid-state circuit breaker based on a thyristor, 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 topological structure of the bidirectional direct current solid-state circuit breaker based on the thyristor comprises a main branch, a commutation and capacitor charging branch, an energy absorption branch and a control unit, and is shown in figure 1. The main branch is composed of a first thyristor (SCR) 1 ) A second thyristor (SCR) 2 ) And a primary coil (L) of a coupling inductor w1 ) The said branch circuit for current conversion and capacitor charging is composed of the third thyristor (SCR) 3 ) The fourth thyristor (SCR) 4 ) A first capacitor (C) 1 ) A second capacitor (C) 2 ) Secondary coil (L) of coupled inductor w2 ) A first diode (D) 1 ) A second diode (D) 2 ) A first resistor (R) 1 ) And a second resistor (R) 2 ) 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 parallel in reverse 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, 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 electrode and first thyristor (SCR) 1 ) Anode connected, a first diode (D) 1 ) A negative electrode and a first capacitor (C) 1 ) Positive electrode connected to a first capacitor (C) 1 ) Negative electrode and first resistor (R) 1 ) One end connected to a first resistor (R) 1 ) The other end is connected with the negative pole of the power supply, and a second diode (D) 2 ) Positive pole and coupling inductance primary coil (L) w1 ) A different name terminal connected with a second diode (D) 2 ) Negative electrode and second capacitor (C) 2 ) Positive electrode connected to a second capacitor (C) 2 ) Negative pole and coupling inductorStage coil (L) w2 ) Connecting the homonymous terminals, coupling the inductive secondary coil (L) w2 ) Homonymous terminal and third thyristor (SCR) 3 ) Cathode connected to, coupled with, an inductive secondary coil (L) w2 ) A different name terminal and a first capacitor (C) 1 ) Negative pole and fourth thyristor (SCR) 4 ) Cathode connected, fourth thyristor (SCR) 4 ) An anode and a second capacitor (C) 2 ) Positive pole connected, second resistor (R) 2 ) One terminal and a second capacitor (C) 2 ) The negative electrode is connected, and the other end of the negative electrode is connected with the negative electrode of the power supply; one end of the piezoresistor (MOV) and the first thyristor (SCR) 1 ) An anode and a first diode (D) 1 ) Positive pole connection, another end of voltage dependent resistor (MOV) and primary coil (L) of coupling inductor w1 ) A different name terminal and a second diode (D) 2 ) Connecting the positive electrode; 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 a fourth thyristor (SCR) 4 ) Is connected to the gate of (1).
The thyristor-based bidirectional direct-current solid-state circuit breaker can realize bidirectional flow of energy and bidirectional interruption and isolation of short-circuit faults. First thyristor (SCR) 1 ) Primary coil (L) of coupled inductor w1 ) The current sensor forms the main branch of the forward flow path of the circuit breaker energy, a first diode (D) 1 ) A third thyristor (SCR) 3 ) A first capacitor (C) 1 ) A first resistor (R) 1 ) And a secondary coil (L) of a coupled inductor w2 ) Forming a current conversion and capacitor charging branch circuit when the energy of the circuit breaker flows forwards; second thyristor (SCR) 2 ) Primary coil (L) of coupled inductor w1 ) A second diode (D) forming a main branch for backward circulation of the circuit breaker energy 2 ) The fourth thyristor (SCR) 4 ) A second capacitor (C) 2 ) A second resistor (R) 2 ) And a secondary coil (L) of a coupled inductor w2 ) Forming a current conversion and capacitor charging branch circuit when the energy of the circuit breaker flows backwards; a voltage dependent resistor (MOV) is an energy absorption loop when the breaker energy flows forwards and backwards; the current sensor and the controller are before the energy of the breakerA control unit in both forward and backward flow.
The control method of the controllable bidirectional direct current solid-state circuit breaker based on the thyristor is characterized by comprising the following steps of: 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 (1)
when a fault occurs:
the method comprises the following steps: when Δ I>Starting to record sampling current data i at 0 k (k is 1,2,3 … … N), the sampling number is N, the sampling frequency is f, then the average sampling current I can be obtained by calculating the N data points of the collected records aver ，
Step two: if I aver >I ref2 If the controller gives SCR to the thyristor 3 The gate pole sends a trigger signal to make it conductive, so that the capacitor C is enabled 1 、SCR 3 Secondary coil L of coupled inductor w2 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 The time interval between the switch-off of the circuit breaker and the switch-on of the circuit breaker should be greater than the capacitance C 1 Charging time of, i.e. T 0 >T 1 。
When working in reverse, if I aver >I ref2 If the controller gives SCR to the thyristor 4 The gate pole sends a trigger signal to make it conductive, so that the capacitor C is enabled 2 、SCR 4 Secondary coil L of coupled inductor w2 And a commutation loop is formed, so that the short-circuit fault is isolated.
When the breaker is conducted again:
setting a minimum time interval between circuit breaker turn-off and circuit breaker re-turn-on 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-on of the circuit breaker should be greater than the capacitance C 2 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, and the breaker is not switched on again until the fault is thoroughly cleared.
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, and the breaker is not switched on again until the fault is thoroughly cleared.
The invention can achieve 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 type of the short-circuit fault can be judged when the circuit breaker is switched on or off again.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
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 graph of output current, first thyristor current and first capacitor voltage waveforms when a load short circuit fault is simulated;
fig. 7 is a waveform diagram of load voltage and load current when load power-off is performed by simulation.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be 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 is obvious that the drawings in the following description are only examples or embodiments of the present application, and that it is also possible for a person skilled in the art to apply the present application to other similar contexts on the basis of these drawings without inventive effort. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
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 otherwise defined, technical or scientific terms referred to herein should have the same meaning as commonly understood by one 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 present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or 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 composed of a first thyristor (SCR) 1 ) A second thyristor (SCR) 2 ) And a primary coil (L) of a coupling inductor w1 ) The said branch circuit for current conversion and capacitor charging is composed of the third thyristor (SCR) 3 ) And a fourth thyristor (SCR) 4 ) A first capacitor (C) 1 ) A second capacitor (C) 2 ) Secondary coil of coupled inductor(L w2 ) A first diode (D) 1 ) A second diode (D) 2 ) A first resistor (R) 1 ) And a second resistor (R) 2 ) The energy absorption branch consists of a piezoresistor (MOV), and the control unit consists of a current sensor and a controller.
The specific working principle of the thyristor-based controllable bidirectional direct-current solid-state circuit breaker and the control method thereof provided by the invention is described as follows:
first thyristor (SCR) when the circuit breaker energy flows forward 1 ) Primary coil (L) of coupled inductor w1 ) The current sensor forms the main branch of the forward flow path of the circuit breaker energy, the first diode (D) 1 ) A third thyristor (SCR) 3 ) A first capacitor (C) 1 ) A first resistor (R) 1 ) And a secondary coil (L) of a coupled inductor w2 ) The circuit breaker comprises a current conversion and capacitor charging branch circuit when energy flows forwards, a voltage dependent resistor (MOV) is an energy absorption branch circuit, and a current sensor and a controller are control units. At this time, the first thyristor (SCR) 1 ) In the on state, the power supply passes through the first diode (D) 1 ) To the first capacitor (C) 1 ) Charging to make its voltage equal to the power supply voltage.
As shown in fig. 2 and 3, the circuit breaker isolates a short-circuit fault. When the load is at t 0 When short-circuit fault happens at any moment, current I is output O In ascending trend when outputting current I O And a reference current I ref1 When the difference delta I is larger than 0, the recording and the collection of the current are started, and the average value I of the current is calculated aver At t 1 Time of day I aver Is greater than I ref2 While, the controller provides a third thyristor (SCR) 3 ) The gate pole sends a trigger signal to turn on the first capacitor (C) 1 ) A third thyristor (SCR) 3 ) And a secondary coil (L) of a coupled inductor w2 ) Forming a via, a first capacitor (C) 1 ) Discharging, instantaneous large current passing through the third thyristor (SCR) 3 ) Flowing 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 Make the current flow through the first thyristorIs reduced to 0, when the first thyristor (SCR) is activated 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 ) Charging the first capacitor (C) 1 ) To make its 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 breaker, and the fault detection and isolation steps shown in fig. 2 and 3 are performed again, if the breaker is turned off again, the breaker is judged to be a permanent fault, and the breaker is not turned on again until the fault is completely cleared.
As shown in fig. 5, the circuit breaker is used as a switch to cut off power to a load. At t 0 Before the moment, the circuit is operating normally, at t 0 At that time, the controller provides the third thyristor (SCR) 3 ) The gate sends a trigger signal and makes it conductive, likewise, when the first capacitor (C) 1 ) A third thyristor (SCR) 3 ) And a secondary coil (L) of a coupled inductor w2 ) Forming a via, a first capacitor (C) 1 ) Discharging, instantaneous large current passing through the third thyristor (SCR) 3 ) Flowing 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, thereby enabling 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 Saber simulation software, and the controllable bidirectional direct current solid-state circuit breaker based on the thyristor, provided by the invention, is verified. The forward flow of breaker energy is described here as an example. The simulated power supply voltage is 270V, the load is 10 omega, the first capacitor and the second capacitor are 100uF, the first resistor and the second resistor are 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 t is 0.5ms, short-circuit fault occurs, and the system output is at this timeCurrent and current flowing through the first thyristor (SCR) 1 ) When the current sensor recognizes that the output current satisfies the fault protection condition, the controller outputs a control signal to turn on a third thyristor (SCR) 3 ) When the first capacitor is discharged (C) 1 ) Releasing a transient high current and flowing through the secondary winding (L) of the coupled 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 short-circuit fault isolation.
Example two: simulation disconnection load
The simulation waveform is shown in fig. 7, and when t is 0.5ms, the controller outputs a control signal to the third thyristor (SCR) 3 ) The gate electrode is turned on, and the first capacitor (C) 1 ) Discharging, discharging transient high current and flowing through the secondary coil (L) of the coupled 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 appended claims.
Claims (4)
1. The utility model provides a controllable two-way direct current solid state circuit breaker based on thyristor which characterized in that: the energy absorption circuit consists of a main branch, a commutation and capacitor charging branch, an energy absorption branch and a control unit;
the main branch is composed of a first thyristor SCR 1 The second thyristor SCR 2 And a coupling inductor primary coil L w1 Forming;
the commutation and capacitor charging branch is a third thyristor SCR 3 And a fourth thyristor SCR 4 A first capacitor C 1 A second capacitor C 2 Secondary coil L of coupled inductor w2 A first diode D 1 A second diode D 2 A first resistor R 1 And a second resistor R 2 Composition is carried out;
the energy absorption branch consists of a piezoresistor MOV;
the control unit consists of a current sensor and a controller.
2. A thyristor-based controllable bidirectional direct current solid state circuit breaker as claimed in claim 1, wherein: the first thyristor SCR 1 And a second thyristor SCR 2 Are connected in parallel in the reverse direction to form a bidirectional current branch,
first thyristor SCR 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 electrode and first thyristor SCR 1 Anode connection, first diode D 1 Negative electrode and first capacitor C 1 Positive electrode connected to a first capacitor C 1 Negative electrode and first resistor R 1 One end connected to a first resistor R 1 The other end is connected with the negative electrode of the power supply, and a second diode D 2 Positive pole and coupling inductance primary coil L w1 A different name terminal connected to a second diode D 2 Negative pole and second capacitor C 2 Positive electrode connected, second capacitor C 2 Negative pole and coupling inductance secondary coil L w2 Connecting the homonymous terminals, coupling the secondary coil L of the inductor w2 Homonymous terminal and third thyristor SCR 3 Cathode connected, coupled with an inductive secondary coil L w2 Different name terminal and first capacitor C 1 Negative pole and fourth thyristor SCR 4 Cathode connected, fourth thyristor SCR 4 An anode and a second capacitor C 2 Connecting the positive electrodes;
a second resistor R 2 One terminal and a second capacitor C 2 The negative electrode is connected, and the other end of the negative electrode is connected with the negative electrode of the power supply; one end of the piezoresistor MOV and the first thyristor SCR 1 Anode and first diode D 1 Positive electrode connection, voltage-sensitiveThe other end of the resistor MOV and the primary coil L of the coupling inductor w1 Different name terminal and second diode D 2 Connecting the positive electrode; 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 a fourth thyristor SCR 4 Is connected to the gate of (c).
3. A thyristor-based controllable bidirectional direct current solid state circuit breaker as claimed in claim 1, wherein: first thyristor SCR 1 Primary coil L of coupled inductor w1 The current sensor forms the main branch of the forward flow channel of the energy of the circuit breaker, and the first diode D 1 And a third thyristor SCR 3 A first capacitor C 1 A first resistor R 1 And a secondary coil L of a coupling inductor w2 Forming a current conversion and capacitor charging branch circuit when the energy of the circuit breaker flows forwards; second thyristor SCR 2 Primary coil L of coupled inductor w1 A second diode D for forming the main branch of the circuit breaker for backward circulation of energy 2 And a fourth thyristor SCR 4 A second capacitor C 2 A second resistor R 2 And a secondary coil L of a coupled inductor w2 Forming a current conversion and capacitor charging branch circuit when the energy of the circuit breaker flows backwards; the voltage dependent resistor MOV is an energy absorption loop when the energy of the breaker flows forwards and backwards; the current sensor and the controller are control units when the energy of the circuit breaker flows forwards and backwards.
4. A method of controlling a thyristor-based controllable 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 to 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 record sampling current data i at 0 k When k is 1,2,3 … … N, the sampling number is N, the sampling frequency is f, and then N data points of the collected records are calculated to obtain the average sampling current I aver ，
Step two: if I aver >I ref2 If the controller gives SCR to the thyristor 3 The gate pole sends a trigger signal to make the gate pole conductive so as to enable the capacitor C 1 、SCR 3 Secondary coil L of coupled inductor w2 A current conversion loop is formed, and isolation of short-circuit faults is further 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 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, and the breaker is not switched on again until the fault is thoroughly cleared.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116111565A (en) * | 2023-02-21 | 2023-05-12 | 湖北工业大学 | Bidirectional solid-state circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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