CN115714352A - Bilateral self-powered bidirectional direct-current solid-state circuit breaker - Google Patents
Bilateral self-powered bidirectional direct-current solid-state circuit breaker Download PDFInfo
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- CN115714352A CN115714352A CN202211503415.1A CN202211503415A CN115714352A CN 115714352 A CN115714352 A CN 115714352A CN 202211503415 A CN202211503415 A CN 202211503415A CN 115714352 A CN115714352 A CN 115714352A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
A bilateral self-powered bidirectional direct-current solid-state circuit breaker comprises a bidirectional solid-state switch, a DC/DC converter and an energy absorption loop, wherein an energy recovery circuit comprises a capacitor C, a piezoresistor MOV and a diode D 1 、D 2 And a ground resistance R; siC power switch tube J of bidirectional solid-state switch 1 The source electrode of the switch is connected with the power supply side, and the SiC power switch tube J 2 The source electrode of the power supply is connected to the line side after passing through the detection unit; one end of the capacitor C and the SiC power switch tube J 1 、J 2 The drain electrode of the capacitor is connected, and the other end of the capacitor pulls down a grounding resistor R; the voltage dependent resistor MOV is connected with the capacitor C in parallel; diode D 1 、D 2 Diode D connected in series in reverse mode by common anode 1 、D 2 Respectively connected with a SiC power switch tube J 1 、J 2 Is connected to the source of (a); the input end of the DC/DC converter is connected with two ends of a capacitor C, and the DC/DC converter supplies power to the detection unit, the control unit and the driving unit after voltage reduction and isolation are carried out on the voltage on the capacitor C; drive unit control SiC power switch tube J 1 、J 2 Is turned off. The invention can realize flexible electricity taking at two sides and uninterrupted self power supply.
Description
Technical Field
The invention relates to the technical field of protection of direct-current power distribution systems, in particular to a bilateral self-powered bidirectional direct-current solid-state circuit breaker.
Background
With the development of new energy power generation technologies such as wind power generation and photovoltaic power generation, a large amount of distributed energy can be applied to a future power grid. In the past decades, the dc power grid has been widely focused by the industry and academia due to the development of technologies such as wind power generation, photovoltaic power generation, hybrid energy storage, electric vehicles, dc home appliances, and the like. Compared with an alternating current power grid, the direct current power grid has the advantages of high efficiency, low reactive power loss and the like, has higher electric energy quality, is easier to integrate a direct current power supply, does not need synchronization and the like. However, because the direct current network system has low impedance and small rotational inertia, and the fault current has the characteristics of high rising speed, large amplitude and the like when short-circuit fault occurs, if a mechanical switch is used for cutting off the fault current, high-voltage large electric arc can be generated at the moment of cutting off, electric equipment can be burned down seriously, the sectioning speed of the mechanical switch is low, and the direct current solid-state circuit breaker which can be quickly cut off without arc better solves the problems, and then becomes a current research hotspot. However, due to the access of various distributed power generation, the direct current system is changed from a single-ended power supply system to a double-ended or multi-ended power supply system, the power transmission characteristics in the system are changed, and unidirectional transmission in the single-ended system is changed into Bidirectional flow in the double-ended or multi-ended system.
Currently, most of the developed BSSCBs cannot be directly placed in a line for use, and all of them require an additional power supply or an auxiliary power supply line for energy supply, and although a small number of BSSCBs achieve self-power supply, there are still many disadvantages, and their self-power-taking schemes are roughly divided into the following three schemes, as shown in fig. 1. The self-powering method illustrated in fig. 1 (a) and 1 (b) is to simply obtain power supply from one side of the BSSCB, but if a short-circuit fault occurs on the corresponding side, the power supply stability is seriously affected, and even the power supply fails. When the power-taking mode shown in fig. 1 (c) is adopted, the voltage drop of the excessive fault current on the power switch device of the BSSCB is used as the starting voltage to start the control unit of the circuit breaker so as to cut off the fault current, the power-taking mode is simple and easy to implement, and the auxiliary unit does not generate any loss when the BSSCB normally works. However, the BSSCB cannot realize the switching-off function and the real-time monitoring function in the normal state due to the power-supplying manner, and the triggering condition for switching-off is determined by the internal resistance of the power switch device and the starting voltage of the chip for controlling the power switch device to be switched off, so that the BSSCB cannot flexibly set the short-circuit threshold current according to the application scene requirement, and has great limitation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bidirectional direct current solid-state circuit breaker which can realize flexible electricity taking at two sides and uninterrupted self power supply.
In order to solve the technical problems, the invention adopts the following technical method: the bilateral self-powered bidirectional direct-current solid-state circuit breaker comprises a bidirectional solid-state switch, a detection unit, a control unit and a driving unit, wherein the bidirectional solid-state switch is composed of a common-drain SiC power switch tube J 1 、J 2 Are formed in an anti-series connection way; the energy recovery circuit comprises a capacitor C, a voltage dependent resistor MOV and a diode D 1 、D 2 And a ground resistance R;
the SiC power switch tube J 1 The source electrode is connected with the power supply side which is connected with a voltage source V 1 SiC power switch tube J 2 The source electrode of the detector is connected with the line side through the detection unit, and the line side is connected with a voltage source V 2 (ii) a One end of the capacitor C and the SiC power switch tube J 1 、J 2 The drain electrode of the capacitor is connected, and the other end of the capacitor pulls down a grounding resistor R; the voltage dependent resistor MOV is connected with the capacitor C in parallel; the diode D 1 、D 2 Diode D connected in series by common anode 1 、D 2 Respectively connected with a SiC power switch tube J 1 、J 2 Is connected to the source of (a); the input end of the DC/DC converter is connected with two ends of a capacitor C, and the DC/DC converter supplies power to the detection unit, the control unit and the driving unit after voltage reduction and isolation are carried out on the voltage on the capacitor C; the output end of the detection unit is connected with the input end of the control unit, the output end of the control unit is connected with the input end of the drive unit, and the output end of the drive unit is connected with the SiC power switch tube J 1 、J 2 Is connected to the gate of (a).
Preferably, the value of the ground resistance R is constrained as follows:
in the formula, V clamp A clamp voltage for a varistor MOV; v DS-max For SiC power switch tube J 1 、J 2 A drain-source breakdown voltage; v in-max The maximum safe input voltage of the DC/DC converter; v DC Is the supply voltage; delta I max The maximum difference allowed by fault currents on two sides of the bidirectional direct current solid-state circuit breaker.
Preferably, the value of the capacitor C is constrained as follows:
in the formula I th Setting a threshold value for the short-circuit current; l is L Is a line inductance; v in-min The minimum safe input voltage of the DC/DC converter.
Further, the bidirectional direct current solid-state circuit breaker further comprises a communication unit, wherein the communication unit is connected with the control unit, and the communication unit is powered by the DC/DC converter.
Preferably, the SiC power switch tube J 1 、J 2 SiC JFET type switching tubes are adopted.
Preferably, a TVS transient voltage suppressor or GDT ceramic gas discharge tube is selected in place of the varistor MOV.
The bilateral self-powered bidirectional direct-current solid-state circuit breaker provided by the invention can realize bilateral self-power supply without additional auxiliary power supply equipment or auxiliary power supply lines, and is free from intermittent self-power supply. Compared with a traditional mode that the BSSCB realizes self-power supply by taking electricity from one side of the BSSCB, the BSSCB can take electricity from two sides of the BSSCB, the problem of energy supply failure possibly caused by the fact that a fault occurs on the electricity taking side is solved, and the stable operation and reliable fault isolation capability of the BSSCB is improved; in addition, the traditional method for taking power from the BSSCB to the voltage drop of the circuit breaker is in a non-power supply state after fault isolation or before no fault occurs, but the method can support the BSSCB to supply power uninterruptedly so as to ensure that the BSSCB has the functions of real-time breaking, real-time monitoring and system communication besides realizing fault isolation.
Drawings
Fig. 1 is a schematic diagram of a conventional BSSCB self-powering scheme;
fig. 2 is a schematic diagram of a BSSCB two-sided flexible power-taking mode provided by the present invention;
figure 3 is a diagram of a dual-sided self-powered bidirectional dc solid state circuit breaker provided by the present invention;
FIG. 4 is a simplified model diagram of a line side short circuit fault according to an embodiment of the present invention;
fig. 5 is a waveform diagram of BSSCB line-side fault response in an embodiment of the present invention;
FIG. 6 is a schematic diagram of the overall process of line side short circuit fault isolation according to the embodiment of the present invention;
FIG. 7 is a simplified model diagram of a power supply side short circuit fault in an embodiment of the present invention;
fig. 8 is a BSSCB power-supply-side fault response waveform diagram in an embodiment of the present invention;
FIG. 9 is a schematic diagram of the overall process of power supply side short circuit fault isolation in an embodiment of the invention;
FIG. 10 is a topological diagram of an experimental platform in an embodiment of the present invention;
fig. 11 is a waveform diagram of experimental results in an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention is further described below with reference to the following examples and the accompanying drawings, which are not intended to limit the present invention.
As described in the background art, in the application occasion of a double-end or multi-end direct current system, the BSSCB has significant disadvantages and limitations in that a method of taking only power to one side of a circuit breaker or taking power to a voltage drop of the circuit breaker is adopted for self-powering, and therefore, the invention provides a self-powered topological structure capable of flexibly taking power from two sides of the BSSCB, as shown in fig. 2, no matter a short-circuit fault occurs on any side of the BSSCB, the self-powered topological structure can obtain stable energy supply from one side in normal operation, and quickly make a fault response action to cut off fault current, thereby achieving the purpose of isolating the fault and ensuring safe and stable operation of a system outside the fault; meanwhile, the self-powered system can overcome the limitation of the energy loss in the normal state caused by the self-powered scheme shown in fig. 1 (c), can realize the breaking function and the online monitoring function in the normal running state of the system, and promotes the digital and information construction of the power grid.
As shown in fig. 3, a bilateral self-powered bidirectional DC solid-state circuit breaker includes a bidirectional solid-state switch, a detection unit, a control unit, a driving unit, a communication unit, a DC/DC converter and an energy absorption circuit, wherein the DC/DC converter includes a transformer with a step-down isolation function and a step-down isolation chipThe voltage reduction isolation chip plays a role in driving and controlling in the DC/DC converter, and stable output of specific voltage is realized. The energy recovery circuit comprises a capacitor C, a voltage dependent resistor MOV and a diode D 1 、D 2 And a ground resistor R, a voltage dependent resistor MOV is used as the most main energy absorption element in the energy recovery circuit, and the ground resistor R and the voltage dependent resistor MOV can be replaced by a TVS transient voltage suppressor or a GDT ceramic gas discharge tube.
The connection relationship between the circuit components is shown in fig. 3, and the bidirectional solid-state switch is composed of two common-drain SiC power switch tubes J 1 、J 2 The SiC JFET type switch tubes are connected in series in an inverted manner, and the SiC power switch tube J 1 The source electrode is connected with the power supply side which is connected with a voltage source V 1 SiC power switch tube J 2 The source electrode of the detector is connected with the line side through the detection unit, and the line side is connected with a voltage source V 2 (ii) a One end of the capacitor C and the SiC power switch tube J 1 、J 2 The other end of the resistor is connected with a pull-down grounding resistor R; the voltage dependent resistor MOV is connected with the capacitor C in parallel; diode D 1 、D 2 Diode D connected in series in reverse mode by common anode 1 、D 2 Respectively connected with the SiC power switch tube J 1 、J 2 Is connected to the source of (a); the input end of the DC/DC converter is connected with the two ends of a capacitor C, the DC/DC converter supplies power to the detection unit, the control unit, the communication unit and the driving unit after voltage reduction and isolation are carried out on the voltage on the capacitor C, and the voltage of the capacitor C is the key for obtaining stable energy supply by the BSSCB; the output end of the detection unit is connected with the input end of the control unit, the output end of the control unit is connected with the input end of the drive unit, and the output end of the drive unit is connected with the SiC power switch tube J 1 、J 2 Is connected to the gate of (a).
Next, how to maintain continuous uninterrupted self-power supply when different short-circuit faults occur is explained by adding BSSCB to a double-end direct-current system, where a power transmission cable is equivalent to an inductor L and a voltage source V 1 、V 2 Is a double-ended dc power supply.
(1) BSSCB response process analysis under line side short circuit fault
Under normal conditionsThe BSSCB is mounted on the side close to the power supply. When a short-circuit fault occurs in a line, the line inductance L is different according to the fault occurrence place L It will be different, as shown in fig. 4, which is a simplified model of a short-circuit fault of a line; the BSSCB response procedure comprises 7 phases, as shown in fig. 5; fig. 6 specifically describes the entire process of BSSCB cutting off the fault current.
Stage I (0-t) 0 ): as shown in FIG. 6 (a), when the DC system is operating normally, the rated current I is set rated At a predetermined threshold value I th In range, BSSCB operation is not triggered.
Stage II (t) 0 -t 1 ): when a short-circuit fault occurs in the line, the current in the line rapidly rises because of the on-state internal resistance R of the SiC JFET, as shown in FIG. 6 (b) ON Very small, essentially negligible, supply side current i source And line side current i line The current rise formula is equation (4).
In the formula, V DC Is the supply voltage; l is a radical of an alcohol L Is the line inductance.
Stage III (t) 1 -t 2 ): as shown in FIG. 6 (b), this stage is the short-circuit fault response time when the short-circuit current reaches the threshold I th And then, sampling is carried out through the detection unit to the control unit, and then the control unit processes the sampling to send a turn-off signal to the driving unit, so that the SiC JFET finally performs turn-off action. The current rise at this stage is expressed by equation (5).
Stage IV (t) 2 -t 3 ): as shown in fig. 6 (c), after BSSCB performs the turn-off action, the power switch tube J 2 The fault current is blocked, and the line inductance L L The medium fault current is absorbed by a capacitor C capable of automatically taking electricity and flows along a ground resistor R, and the current in the system and the voltage u at two ends of the capacitor C C The change is as in formula (6).
In the formula I fault Is a line short fault current.
Stage V (t) 3 -t 4 ): when the capacitor C sinks the fault current to the clamp voltage V of the varistor MOV, as shown in FIG. 6 (d) clamp Then, the fault current is transferred to the MOV branch circuit of the voltage dependent resistor for absorption, and the current in the system and the voltage u at the two ends of the capacitor C C The variation is as in equation (7).
Stage VI (t) 4 -t 5 ): as shown in fig. 6 (e), the current in the line inductor at this stage is almost the same, and only needs to follow current through the ground resistor R; at the same time, the power switch tube J 1 Blocks the capacitor C to the voltage source V 1 Current-injected power switch tube J 1 Withstand voltage u C -V DC 。
Stage VII (t) 5 -t 6 ): as shown in fig. 6 (f), since the detection unit, the control unit and the driving unit are all powered by the capacitor C which automatically takes power, the fault current energy absorbed by the capacitor C is absorbed and reused, and finally the voltage of the capacitor C returns to V DC 。
(2) BSSCB response process analysis under power supply side short circuit fault
When a short-circuit fault occurs on the power supply side, a simplified model of the short-circuit fault is shown in fig. 7. The BSSCB response procedure includes 7 phases, as shown in fig. 8; fig. 9 specifically describes the entire process of BSSCB cutting off the fault current.
Stage I (0-t) 0 ): as shown in FIG. 9 (a), when the DC system is in normal operation, the circuit in the line changes according to the power flow I rated And the BSSCB is not triggered to work within the safety threshold range.
Stage II (t) 0 -t 1 ): as shown in FIG. 9 (b), when the bus bar has a short-circuit fault, the short-circuit current is supplied from the voltage source V 2 Through line inductance L L And the capacitor C discharges to the short-circuit fault through an RC loop together, and the line side current i line Bus side current i source And the voltage u across the capacitor C C Is represented by the formula (8).
Stage III (t) 1 -t 2 ): similar to the line side fault, this phase is the time for the BSSCB to respond to the threshold current, and is a continuation of the previous phase.
Stage IV (t) 2 -t 3 ): as shown in FIG. 9 (C), this stage is also similar to a line fault, but the ground resistor R does not participate in the process, and the capacitor C absorbs the fault current, the current change in the system, and u C The variation is as in equation (9).
Stage V (t) 3 -t 4 ): as shown in FIG. 9 (d), again this stage is similar to a line fault, but the resistor R does not participate in the process, the fault current is diverted to the varistor MOV leg, the current in the system changes and u C Variation is as in equation (10).
Stage VI (t) 4 -t 5 ): as shown in fig. 9 (e), similar to a line fault, the power switch tube J 2 Blocks the capacitor C to the voltage source V 2 Current-injected power switch tube J 1 Withstand voltage u C -V DC But because of line inductance L L No current is available in the circuit, so that no resistor R is needed for freewheeling.
Stage VII (t) 5 -t 6 ): as shown in the figure9 (e), because the detection unit, the control unit and the driving unit are all powered by the capacitor C which automatically takes electricity, the fault current energy absorbed by the capacitor C is absorbed and reused, and finally the voltage of the capacitor C returns to V DC 。
The design of the present invention for some important circuit parameters is as follows, based on the short circuit fault analysis described above.
1) Ground resistance R
Through the analysis of the line fault process, the grounding resistance R can influence the fault current cutting speed of the bus side and the line side. If the ground resistance R value is relatively small, the situation that the bus side fault current removal speed is extremely high and the line side fault current removal speed is relatively low can occur, and the safety of line side equipment is seriously influenced. Therefore, the value of the grounding resistance R should be as large as possible to synchronously cut off the fault current on two sides. So firstly, the maximum allowable difference value of fault currents on two sides of the bidirectional direct current solid-state circuit breaker is set to be delta I max . The analysis of the line fault removing process shows that the maximum difference value of fault currents on two sides is at t 4 At a time i line (t 4 )≤ΔI max As shown in fig. 5; therefore, it can be seen from the combination formula (7) that the value of the resistance R should satisfy the following formula (1).
2) Varistor MOV
Clamping voltage V of varistor MOV clamp Directly related to the cut-off speed of the fault current, it can be seen from the equations (7) and (10) that when the voltage dependent resistor MOV is equivalent to a constant voltage source model, the falling speed of the fault current on the line inductor and the clamping voltage V clamp Voltage source V DC Is proportional to the difference of (c), the clamping voltage V clamp The higher the fault removal speed is, the higher the drain-source voltage born by the SiC JFET of the switching device is, and when the drain-source breakdown voltage V is exceeded, the drain-source breakdown voltage V is increased DS-max Even breakdown the SiC JFET, so the clamp voltage V is needed clamp Limiting; voltage range V on the same capacitor C in-min ～V in-max (V in-max 、V in-min Maximum safe input voltage, minimum safe input voltage, respectively, of the DC/DC converter) to the clamp voltage V clamp There are also limitations. So the clamping voltage V of the varistor MOV clamp The following formula (2) should be satisfied.
3) Capacitor C capable of automatically taking electricity
Firstly, through the analysis of the bus fault process, when a bus has a short-circuit fault, not only can the short-circuit current be released to a fault point by a line side, but also the short-circuit current can be released to the fault point by an RC loop formed by a grounding resistor R and a self-powered capacitor C in a BSSCB, so that the voltage on the capacitor C can be exponentially reduced, and the power supply of the BSSCB detection unit and the control unit is taken from the capacitor C, so that the value of the capacitor C is ensured to be taken when the fault current reaches I th Is maintained at the minimum input voltage V in-min Above, i.e. u C (t 2 )≥V in min As can be seen from the equation (8), the value of the capacitance C should satisfy the following equation (3).
Secondly, the value of the capacitor C is related to the speed of the BSSCB in removing the short-circuit fault, and particularly when a line fault occurs, the fault point is close to the BSSCB, and the line inductance L is L Substantially zero, if capacitance C is too large, it will affect BSSCB turn-off speed, so the value of capacitance C is as small as possible if equation (3) is satisfied.
When the BSSCB responds to short-circuit faults on two sides of the BSSCB, continuous and stable energy supply of each unit in the BSSCB is guaranteed, so that the BSSCB is free of short-circuit faults, and support for safe and stable operation of a system is guaranteed. And after the fault area is isolated, the BSSCB can still stably supply power to ensure the normal work of the BSSCB, and the possibility is provided for subsequent system communication and guidance of the BSSCB reclosing to recover the normal power supply of the system.
To verify the effectiveness of the BSSCB self-powering scheme proposed by the present invention, the present embodiment establishes an experimental platform as shown in fig. 10. Wherein the voltage source V 1 、V 2 Is a 400V DC power supply, a capacitor C DC The capacitor is a large 3.3mF capacitor formed by capacitor cascade connection; switch K 1 The switch realizes the charging and discharging of a large capacitor by a direct current source, and the switch K 2 The closing of (2) is the situation of simulating a short-circuit fault; FIG. 10 (a) is a graph simulating line inductance L during a line-side short-circuit fault L Will present different values (0-5 mH) due to different fault positions, and the line inductance L will be shown in FIG. 10 (b) when the power source side short circuit fault occurs L At a maximum (5 mH); device parameters, DC/DC converter parameters, and fault current setting threshold I used in BSSCB th As shown in table 1 below.
TABLE 1 Experimental parameters
In this embodiment, a sample BSSCB of 400V/20A is adopted to perform a short-circuit fault test, and the waveform of the test result is shown in FIG. 11, I fault For line short-circuit fault currents, V GS Is the gate drive voltage of the SiC JFET u C Is the voltage across the capacitor C, V 15 Outputting the voltage for the DC/DC converter.
As can be seen from fig. 11 (a), when a line-side short-circuit fault is simulated, the line inductance L is obtained L =0, the fault current rises linearly, BSSCB has a response time of 500ns after the threshold current 40A is reached, and when the fault current reaches 68A, the fault current is cut off and the fault current is cut off within 2us, and the voltage of the capacitor C is stabilized within the normal supply voltage range; as can be seen from fig. 11 (b), when the line side short-circuit fault is simulated, the line inductance L is obtained L When =5mH, BSSCB can quickly cut off the fault current when the fault current reaches the threshold current 40A, and the voltage of the capacitor C is stabilized within the normal supply voltage range; as can be seen from FIG. 11 (c), short-circuiting occurs on the analog power supply sideAt the time of fault, the fault current rises rapidly, and simultaneously, the voltage on the capacitor C also drops due to RC loop discharge, but can still be maintained at 330V and higher than the minimum safe power supply voltage 210V when BSSCB performs fault current cutting action. Therefore, the experiment well proves that the BSSCB provided by the invention can stably supply power in a plurality of fault states, and ensures the quick removal of faults and the safe and stable operation of a system.
The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.
Some of the figures and descriptions of the present invention have been simplified to provide a convenient understanding of the modifications of the invention relative to the prior art, and to omit elements for clarity, as those skilled in the art will recognize which may also constitute the subject matter of the present invention.
Claims (6)
1. The bilateral self-powered bidirectional direct-current solid-state circuit breaker comprises a bidirectional solid-state switch, a detection unit, a control unit and a drive unit, wherein the bidirectional solid-state switch is composed of a common-drain SiC power switch tube J 1 、J 2 The anti-series connection is characterized in that: the energy recovery circuit comprises a capacitor C, a voltage dependent resistor MOV and a diode D 1 、D 2 And a ground resistance R;
the SiC power switch tube J 1 The source electrode is connected with the power supply side which is connected with a voltage source V 1 SiC power switch tube J 2 The source electrode of the detector is connected with the line side through the detection unit, and the line side is connected with a voltage source V 2 (ii) a One end of the capacitor C and the SiC power switch tube J 1 、J 2 The drain electrode of the capacitor is connected, and the other end of the capacitor pulls down a grounding resistor R; the voltage dependent resistor MOV is connected with the capacitor C in parallel; the diode D 1 、D 2 Diode D connected in series in reverse mode by common anode 1 、D 2 Of the cathodeSiC power switch tube J 1 、J 2 Is connected to the source of (a); the input end of the DC/DC converter is connected with two ends of a capacitor C, and the DC/DC converter supplies power to the detection unit, the control unit and the driving unit after voltage reduction and isolation are carried out on the voltage on the capacitor C; the output end of the detection unit is connected with the input end of the control unit, the output end of the control unit is connected with the input end of the drive unit, and the output end of the drive unit is connected with the SiC power switch tube J 1 、J 2 Is connected to the gate of (a).
2. The double-sided self-powered bidirectional direct current solid state circuit breaker of claim 1, wherein: the value constraint of the grounding resistor R is as follows:
in the formula, V clamp A clamping voltage of a varistor MOV; v DS-max For SiC power switch tube J 1 、J 2 A drain-source breakdown voltage; v in-max The maximum safe input voltage of the DC/DC converter; v DC Is the supply voltage; delta I max The maximum difference allowed by fault currents on two sides of the bidirectional direct current solid-state circuit breaker.
3. The double-sided self-powered bidirectional direct current solid state circuit breaker of claim 2, wherein: the value constraint of the capacitor C is as follows:
in the formula I th Setting a threshold value for the short-circuit current; l is L Is a line inductance; v in-min For DC/DC conversionThe converter minimizes the safe input voltage.
4. The double-sided self-powered bidirectional direct current solid state circuit breaker of claim 3, wherein: the bidirectional direct current solid-state circuit breaker further comprises a communication unit, wherein the communication unit is connected with the control unit, and the communication unit is powered by the DC/DC converter.
5. The double-sided self-powered bidirectional direct current solid state circuit breaker of claim 4, wherein: the SiC power switch tube J 1 、J 2 SiC JFET type switching tubes are adopted.
6. The double-sided self-powered bidirectional direct current solid state circuit breaker of claim 1, wherein: and a TVS transient voltage suppressor or a GDT ceramic gas discharge tube is selected to replace the piezoresistor MOV.
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| CN202211503415.1A CN115714352A (en) | 2022-11-28 | 2022-11-28 | Bilateral self-powered bidirectional direct-current solid-state circuit breaker |
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| CN202211503415.1A CN115714352A (en) | 2022-11-28 | 2022-11-28 | Bilateral self-powered bidirectional direct-current solid-state circuit breaker |
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