CN107534438A - DC solid circuit breaker and distribution system - Google Patents
DC solid circuit breaker and distribution system Download PDFInfo
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- CN107534438A CN107534438A CN201680018811.1A CN201680018811A CN107534438A CN 107534438 A CN107534438 A CN 107534438A CN 201680018811 A CN201680018811 A CN 201680018811A CN 107534438 A CN107534438 A CN 107534438A
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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
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
- H03K17/73—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region for dc voltages or currents
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Abstract
A kind of DC solid circuit breaker and distribution system.The DC solid circuit breaker includes short-circuit protection unit (C), charging switching element (D) and main switch unit (A).Short-circuit protection unit (C) includes the first storage capacitor (C1), the first current-limiting inductance (L1), the first power diode (D1), the second storage capacitor (C2), the second current-limiting inductance (L2) and the second power diode (D2).Charging switching element (D) includes the first charging paths (S1) and the second charging paths (S2).Main switch unit (A) includes at least one main switch IGCT (T1).Storage capacitor and resonant parameter in the DC solid circuit breaker refer to the requirement of overcurrent protection to design, and therefore, it is possible to reduce the volume of DC solid circuit breaker and cost, can also improve the reliability of DC solid circuit breaker.
Description
The present disclosure relates to the technical field of power equipment, and in particular, to a dc solid-state circuit breaker and a power distribution system including the same.
The modern society puts forward higher requirements on power systems and power transmission technologies, and the development direction of the power industry becomes how to further improve the stability of a power grid and provide high-quality electric energy for users. The circuit breaker is an important link in a power transmission line, and the performance of the circuit breaker directly influences the normal operation of a power grid. For example, a dc solid state circuit breaker is a power automation device based on semiconductor switches for quickly removing faults from a dc power transmission, distribution system or dc power supply. The device has the advantages of flexible control, quick action, no electric arc, long service life, high reliability and the like.
The semiconductor switches currently used in dc solid state circuit breakers are mainly thyristors. For example, in chinese patent application publication No. CN102222874A, a dc solid state circuit breaker as shown in fig. 1 is provided. The key of the normal opening of the direct current solid-state circuit breaker is mainly that the first energy storage capacitor C1 and the first energy storage capacitor C2 resonate with the first resonant inductor Lr1, and the resonant current is larger than the load current. The key of the fault disconnection of the direct current solid-state circuit breaker is mainly that the first energy storage capacitor C1 and the first energy storage capacitor C2 are utilized to resonate with the second resonant inductor Lr2, and the resonant current is larger than the fault current.
However, in the event of a short-circuit fault, the fault current is typically large and difficult to estimate, such that a large capacitance of the first energy storage capacitor C1 and the first energy storage capacitor C2 is required to provide enough energy to clear the short-circuit fault. This not only increases the volume and cost of the dc solid state circuit breaker, but also poses a risk to the reliability of the dc solid state circuit breaker. In addition, the direct current solid-state circuit breaker does not have the function of zero current starting, and similar situations are common in other existing direct current solid-state circuit breakers.
Disclosure of Invention
It is an object of the present disclosure to provide a more reliable direct current solid state circuit breaker and a power distribution system including the same, thereby overcoming, at least to some extent, one or more of the problems due to the limitations and disadvantages of the related art.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to a first aspect of the present disclosure, there is provided a direct current solid state circuit breaker comprising:
a short-circuit protection unit comprising:
a first energy storage capacitor;
a first current-limiting inductor having a first terminal coupled to the first end of the first energy-storage capacitor and a second terminal coupled to a first terminal of a load;
a first power diode, the cathode of which is coupled to the second end of the first current-limiting inductor;
a second energy storage capacitor, wherein the first end of the second energy storage capacitor is connected with the anode of the first power diode;
a second current-limiting inductor, wherein a first end of the second current-limiting inductor is coupled to a second end of the second energy-storing capacitor, and a second end of the second current-limiting inductor is coupled to a second end of the load; and
a second power diode, wherein the anode of the second power diode is coupled to the second end of the second current-limiting inductor, and the cathode of the second power diode is coupled to the second end of the first energy-storing capacitor;
a charge switch unit comprising:
a first charging branch, both ends of which are coupled with both poles of the first power diode respectively;
a second charging branch, both ends of which are coupled with both poles of the second power diode respectively;
a main switching unit comprising:
the first pole of the main switching thyristor is coupled with a direct current power supply; when a first fault occurs on the load side, the first energy storage capacitor and the second energy storage capacitor apply a reverse voltage to the second pole of the main switch thyristor to force the main switch thyristor to be turned off.
In an exemplary embodiment of the present disclosure, further comprising:
and the auxiliary switch unit is connected with the main switch thyristor in parallel and used for providing a natural zero crossing point of current for the main switch thyristor when a second fault occurs on the load side or a normal disconnection request exists.
In an exemplary embodiment of the present disclosure, the first fault is a short-circuit fault; the second fault is an overcurrent, overvoltage, undervoltage or leakage fault.
In an exemplary embodiment of the present disclosure, the main switching unit includes:
and the anode of the first main switch thyristor is coupled with the anode of the direct current power supply, and the cathode of the first main switch thyristor is coupled with the first end of the first energy storage capacitor.
In an exemplary embodiment of the present disclosure, the auxiliary switching unit includes:
the first energy storage capacitor;
a first auxiliary switch thyristor, the anode of which is coupled with the positive pole of the DC power supply; and
a first resonant inductor having a first terminal connected to the cathode of the first auxiliary switch thyristor and a second terminal coupled to the second terminal of the first energy storage capacitor.
In an exemplary embodiment of the present disclosure, the main switching unit includes:
and the cathode of the second main switch thyristor is coupled with the negative electrode of the direct current power supply, and the anode of the second main switch thyristor is coupled with the second end of the second energy storage capacitor.
In an exemplary embodiment of the present disclosure, the auxiliary switching unit includes:
the second energy storage capacitor;
a second auxiliary switch thyristor, the cathode of which is coupled with the cathode of the DC power supply; and
and a second resonant inductor, wherein a first end of the second resonant inductor is connected with the anode of the second auxiliary switch thyristor, and a second end of the second resonant inductor is coupled with the first end of the second energy storage capacitor.
In an exemplary embodiment of the present disclosure, the first charging branch and the second charging branch include a switching device and/or a power resistor.
In an exemplary embodiment of the present disclosure, the thyristors are all unidirectional thyristors.
According to a second aspect of the present disclosure, there is provided a power distribution system comprising any one of the above described dc solid state circuit breakers.
The energy storage capacitor and the resonance parameter used in the direct current solid-state circuit breaker provided in the exemplary embodiment of the disclosure are designed only by referring to the overcurrent protection requirement, so that not only can the volume and the cost of the direct current solid-state circuit breaker be greatly reduced, but also the reliability of the direct current solid-state circuit breaker is improved.
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of a dc solid-state circuit breaker in the prior art.
Fig. 2 is a schematic structural diagram of a dc solid state circuit breaker in an exemplary embodiment of the present disclosure.
Fig. 3A is a schematic structural diagram of another dc solid-state circuit breaker in an exemplary embodiment of the disclosure.
Fig. 3B is a schematic structural diagram of another dc solid-state circuit breaker in an exemplary embodiment of the disclosure.
Fig. 4 is a signal waveform diagram of the dc solid state circuit breaker of fig. 2.
Fig. 5A is an equivalent circuit diagram of the dc solid state circuit breaker of fig. 2 between times t0-t 1.
Fig. 5B is an equivalent circuit diagram of the dc solid state circuit breaker of fig. 2 between times t1-t 2.
Fig. 6 is an equivalent circuit diagram of the dc solid state circuit breaker of fig. 2 between times t2-t 3.
Fig. 7 is a schematic diagram of still another signal waveform of the dc solid state circuit breaker of fig. 2.
Fig. 8A is an equivalent circuit diagram of the dc solid state circuit breaker of fig. 2 between-time.
Fig. 8B is an equivalent circuit diagram of the dc solid state circuit breaker of fig. 2 between-time.
Fig. 8C is an equivalent circuit diagram of the dc solid state circuit breaker of fig. 2 after time.
Description of reference numerals:
a main switch unit
B auxiliary switch unit
C short-circuit protection unit
D charging switch unit
C1 first energy storage capacitor
C2 second energy storage capacitor
D1 first power diode
D2 second power diode
DC direct current power supply
L1 first current limiting inductor
L2 second current limiting inductor
Lr1 first resonant inductor
Lr2 second resonance inductor
RL load
S1 first charging branch
S2 second charging branch
T1 first main switch thyristor
T2 first auxiliary switch thyristor
T3 second main switch thyristor
T4 second auxiliary switch thyristor
Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the size of some of the elements may be exaggerated or distorted for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, etc. In other instances, well-known structures, methods, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The present exemplary embodiment first provides a direct current solid state circuit breaker. The direct current solid-state circuit breaker mainly comprises a main switch unit, a short-circuit protection unit and a charging switch unit; in other exemplary embodiments of the present disclosure, an auxiliary switch unit may be further included. The main switch unit is mainly used for providing a channel for load current when the circuit normally runs; the short-circuit protection unit is mainly used for providing reverse voltage for the main switch unit to force the main switch unit to be naturally turned off immediately when a first fault occurs, such as a short-circuit fault; the charging switch unit is mainly used for providing a charging loop for the energy storage capacitor in the short-circuit protection unit when the circuit normally operates; the auxiliary switch unit is mainly used for providing enough energy for cutting off the main switch unit when a second fault, such as overcurrent, overvoltage, undervoltage or electric leakage, which can be measured, occurs.
As shown in fig. 2, is an exemplary embodiment of the above-described direct current solid state circuit breaker. The main switch unit a mainly includes a first main switch thyristor T1. The auxiliary switch unit B mainly includes the first energy storage capacitor C1, a first auxiliary switch thyristor T2 and a first resonant inductor Lr 1. The short-circuit protection unit C mainly includes a first energy-storage capacitor C1, a first current-limiting inductor L1, a first power diode D1, a second energy-storage capacitor C2, a second current-limiting inductor L2, and a second power diode D2. The charging switch unit D mainly includes a first charging branch S1 and a second charging branch S2.
A first terminal of a first current-limiting inductor L1 is coupled to the first terminal of the first energy-storage capacitor C1, and a second terminal of the first current-limiting inductor L1 is coupled to a first terminal of a load RL. The cathode of the first power diode D1 is coupled to the second terminal of the first current-limiting inductor L1. A first terminal of a second energy storage capacitor C2 is connected to the anode of the first power diode D1. A first terminal of a second current-limiting inductor L2 is coupled to the second terminal of the second energy-storing capacitor C2, and a second terminal of a second current-limiting inductor L2 is coupled to the second terminal of the load RL. An anode of the second power diode D2 is coupled to the second terminal of the second current-limiting inductor L2, and a cathode of the second power diode D2 is coupled to the second terminal of the first energy-storing capacitor C1. The first power diode D1 and the second power diode D2 are mainly used for providing a discharge path for the first energy-storage capacitor C1 and the second energy-storage capacitor C2 when a short-circuit fault occurs. Two ends of the first charging branch S1 are respectively coupled to two poles of the first power diode D1. Two ends of the second charging branch S2 are respectively coupled to two poles of the second power diode D2. The anode of the first main switching thyristor T1 is coupled to the DC positive terminal of the DC power source, and the cathode of the first main switching thyristor T1 is coupled to the first end of the first energy storage capacitor C1. The anode of the first auxiliary switching thyristor T2 is coupled to the DC power supply DC positive electrode. A first terminal of the first resonant inductor Lr1 is connected to the cathode of the first auxiliary switching thyristor T2, and a second terminal of the first resonant inductor Lr1 is coupled to the second terminal of the first energy-storing capacitor C1.
As shown in fig. 3A, in other exemplary embodiments of the present disclosure, the main switching unit a may also include a second main switching thyristor T3. The cathode of the second main switching thyristor T3 is coupled with the DC negative pole of the DC power supply, and the anode of the second main switching thyristor T3 is coupled with the second end of the second energy storage capacitor C2; alternatively, as shown in fig. 3B, the main switching unit a may also include both the above-described first and second main switching thyristors T1 and T3. The auxiliary switch unit B may also include the second energy storage capacitor C2, a second auxiliary switch thyristor T4, and a second resonant inductor Lr 2. The cathode of the second auxiliary switching thyristor T4 is coupled to the DC negative terminal of the DC power supply. A first end of a second resonant inductor Lr2 is connected with the anode of the second auxiliary switching thyristor T4, and a second end of the second resonant inductor Lr2 is coupled with a first end of the second energy storage capacitor C2; alternatively, as shown in fig. 3, the auxiliary switch unit B may also include the first energy storage capacitor C1, the first auxiliary switch thyristor T2, the first resonant inductor Lr1, the second energy storage capacitor C2, the second auxiliary switch thyristor T4, and the second resonant inductor Lr 2.
It can be seen that in the present exemplary embodiment, the first energy storage capacitor C1 is included in both the auxiliary switching unit B and the short-circuit protection unit C. A second energy storage capacitor C2 is also included in both the auxiliary switching unit B and the short-circuit protection unit C. The first charging branch S1 and the second charging branch S2 may have the same structure, and may be formed by a single switching device such as a mechanical or semiconductor switch, a single power resistor, or a combination of a series connection of a switching device such as a mechanical or semiconductor switch and a power resistor. In the dc solid state circuit breaker shown in fig. 3, the first main switching thyristor T1 and the second main switching thyristor T3 will operate in the same manner, i.e., simultaneously turned on and simultaneously turned off, and the first auxiliary switching thyristor T2 and the second auxiliary switching thyristor T4 will also operate in the same manner, i.e., simultaneously turned on and simultaneously turned off. Further, the first main switching thyristor T1, the first auxiliary switching thyristor T2, the second main switching thyristor T3, and the second auxiliary switching thyristor T4 are all preferably unidirectional thyristors in the present exemplary embodiment.
In the above-mentioned dc solid-state circuit breaker, when a first fault, such as a short-circuit fault, occurs on the load RL side, the first energy-storage capacitor C1 and the second energy-storage capacitor C2 in the short-circuit protection unit C apply a reverse voltage to one pole of the coupling of the main switching thyristor and the short-circuit protection unit C, so as to force the main switching thyristor and the short-circuit protection unit C to turn off naturally. When a second fault occurs on the load RL side, such as an overcurrent, overvoltage, undervoltage or leakage which can be measured, or a normal disconnection request is made, the auxiliary switch unit B provides a natural zero crossing point of current for the main switch thyristor, so that the main switch thyristor is naturally turned off.
The short-circuit fault function of the dc solid-state circuit breaker in the present exemplary embodiment is mainly realized by applying reverse electrical compression to the main switching thyristor by the energy storage capacitor to turn off the main switching thyristor naturally, so that the magnitude relationship with the energy storage capacitor is theoretically small. And the other faults are removed and normally disconnected by utilizing an LC resonance circuit which is formed by the energy storage capacitor and the resonance inductor and is connected with the main switch thyristor in parallel to provide a current natural zero crossing point for the main switch thyristor to force the main switch thyristor to be naturally turned off, so that the fault is related to the size of the energy storage capacitor and resonance parameters in theory. For the direct current solid-state circuit breaker in the prior art, the short-circuit fault is also cut off by using the LC auxiliary resonant circuit to provide a natural zero-crossing current, that is, the resonant parameters and the size of the energy storage capacitor must meet the requirement of cutting off the short-circuit fault. However, the short-circuit current is usually much larger than the rated current and even larger than the overcurrent current, so in the prior art dc solid-state circuit breaker, a large energy storage capacitor is needed to provide enough energy to cut off the short-circuit fault. The energy storage capacitor and the resonance parameter used in the method are designed only by referring to the overcurrent protection requirement, so that the volume and the cost of the direct current solid-state circuit breaker are greatly reduced, and the reliability of the direct current solid-state circuit breaker is improved.
Further, a power distribution system is provided in the present exemplary embodiment, and includes any one of the above dc solid state circuit breakers. In power distribution systems, dc solid state circuit breakers, although small, are important components. With the direct current solid state circuit breaker in the present exemplary embodiment, the reliability of the power distribution system can be increased to a large extent.
Hereinafter, the operation principle of the dc solid-state circuit breaker in the present exemplary embodiment will be further described by taking the dc solid-state circuit breaker in fig. 2 as an example.
Referring to the signal waveform diagram in fig. 4, the starting process of the dc solid-state circuit breaker is performed from time t0 to time t 1. When the dc solid-state circuit breaker is started, i.e. at time T0, the first main switching thyristor T1, the first charging branch S1 and the second charging branch S2 are triggered to conduct simultaneously. Since the first current-limiting inductor L1 and the second current-limiting inductor L2 are connected in series in the main loop, the input current IDC and the load current ILoad gradually increase from zero. The first energy storage capacitor C1 is charged by the DC power DC via the second charging branch S2 and the second current limiting inductor L2, and the second energy storage capacitor C2 is charged by the DC power DC via the first charging branch S1 and the first current limiting inductor L1, so that their voltages gradually increase. The equivalent circuit for this process is shown in fig. 5A. It can be seen that the dc solid-state circuit breaker in the exemplary embodiment has a zero-current starting function, which is mainly implemented by using the first main switching thyristor T1, the first current-limiting inductor L1, and the second current-limiting inductor L2 connected in series in the main circuit, and is not affected by other auxiliary circuits (including the first auxiliary switching thyristor T2, the first resonant inductor Lr1, the first energy-storing capacitor C1, the second energy-storing capacitor C2, the first power diode D1, the second power diode D2, the first charging branch S1, and the second charging branch S2).
The charging process ends when the voltage VC1 of the first energy storage capacitor C1 and the voltage VC2 of the second energy storage capacitor C2 increase to be the same as the DC voltage VDC of the DC power supply. The load voltage VRL is also increased to the DC supply DC voltage VDC so that the circuit enters a steady state, after which, i.e. after time T1, the DC supply DC supplies current to the load RL through the first main switching thyristor T1, the first current limiting inductor L1 and the second current limiting inductor L2, as shown in fig. 5B. Therefore, in normal operation, the load current ILoad only flows through the first main switching thyristor T1, the first current-limiting inductor L1, and the second current-limiting inductor L2, and the other auxiliary circuits (including the first auxiliary switching thyristor T2, the first resonant inductor Lr1, the first energy-storage capacitor C1, the second energy-storage capacitor C2, the first power diode D1, the second power diode D2, the first charging branch S1, and the second charging branch S2) are in the inactive state.
At time t2 in fig. 4, a first fault F1 occurs on the load RL side, for example a short-circuit fault, i.e. the load RL impedance momentarily abruptly changes to zero. The load RL voltage is therefore abruptly changed to zero and the first power diode D1 and the second power diode D2 conduct due to forward biasing. The first energy storage capacitor C1 and the second energy storage capacitor C2 are directly connected in series through the first power diode D1 and the second power diode D2, and a reverse voltage is applied to the first main switching thyristor T1, so that the first main switching thyristor T1 is naturally turned off due to the reverse voltage.
Thereafter, as shown in fig. 6, the first energy storage capacitor C1 and the first current limiting inductor L1 form an LC loop through the first power diode D1, and the second energy storage capacitor C2 and the second current limiting inductor L2 form another same LC loop through the second power diode D2. The first energy storage capacitor C1 discharges the first current limiting inductor L1 and the second energy storage capacitor C2 discharges the second current limiting inductor L2 such that the short circuit current IF1 gradually increases.
At time t3, the voltages of the first energy-storage capacitor C1 and the second energy-storage capacitor C2 are discharged to zero and the short-circuit current IF1 reaches a maximum value, and then the first current-limiting inductor L1 reversely charges the first energy-storage capacitor C1 and the second current-limiting inductor L2 reversely charges the second energy-storage capacitor C2, so that the voltages of the first energy-storage capacitor C1 and the second energy-storage capacitor C2 are negative and gradually increase, and at the same time, the short-circuit current IF1 gradually decreases.
By the time t4, the short circuit current IF1 is reduced to zero and all energy is stored in the first energy storage capacitor C1 and the second energy storage capacitor C2, and the circuit stops operating.
Referring to the signal waveform diagram in fig. 5, the time t0 to the time t1 are the starting process of the dc solid state circuit breaker, which is similar to that in fig. 4, and therefore, the detailed description thereof is omitted here. At the moment, the second fault F2 occurs on the load RL side, such as measurable fault like overcurrent, overvoltage, undervoltage or leakage, or, in case of a normal turn-off request, the first auxiliary switching thyristor T2 is triggered to immediately turn on. The first energy storage capacitor C1 and the first resonant inductor Lr1 are LC-resonated through the first main switching thyristor T1 and the second main switching thyristor T2. The equivalent circuit at this time is as shown in fig. 8A, and as the resonance current IT2 increases, the current IT1 flowing through the first main switching thyristor T1 gradually decreases.
At the moment the resonant current IT2 increases to be the same as the fault current IF2, the first main switching thyristor T1 naturally turns off as the current decreases to zero. After that, the first resonant inductor Lr1 and the first energy-storing capacitor C1 are completely connected in series in the main circuit, and the equivalent circuit is as shown in fig. 8B. Since the voltage of the first energy storage capacitor C1 has not completely dropped to zero at this time, the loop current will gradually increase.
At the moment of arrival, the voltage of the first energy-storage capacitor C1 drops to zero and the loop current increases to a maximum value. Thereafter the first energy storage capacitor C1 is charged in reverse and the loop current gradually decreases as the capacitor voltage increases. Finally, the first auxiliary switching thyristor T2 turns off naturally at the instant when the loop current decreases to zero. The entire fault terminal F2 is completely disconnected from the DC side of the DC power supply because both the first main switching thyristor T1 and the first auxiliary switching thyristor T2 are turned off, and the equivalent circuit is shown in fig. 8C.
It can be seen that the dc solid-state circuit breaker in the exemplary embodiment further has a zero-current turn-off function, which is mainly implemented by using a resonant branch (formed by connecting the first auxiliary switching thyristor T2, the first resonant inductor Lr1 and the first energy storage capacitor in series) in parallel with the first main switching thyristor T1 to provide a natural zero-crossing point of current for the main switching thyristor. Moreover, the direct current solid-state circuit breaker has the function of quickly cutting off measurable faults such as overcurrent, overvoltage, undervoltage and leakage, and the like of the second faults, and is also mainly realized by providing a natural zero crossing point of current for the first main switching thyristor T1 by using a resonant branch (formed by connecting the first auxiliary switching thyristor T2, the first resonant inductor Lr1 and the first energy storage capacitor in series) which is connected with the first main switching thyristor T1 in parallel.
In summary, the dc solid-state circuit breaker provided in the exemplary embodiment can effectively solve the problem that the main switch unit cannot be turned off effectively due to insufficient energy provided by the energy storage capacitor when the first fault, for example, a short-circuit fault occurs. The direct-current solid-state circuit breaker can immediately remove a first fault, such as a short-circuit fault, from a direct-current power transmission, distribution system or direct-current power supply DC side, can also quickly remove a second fault, such as measurable faults of overcurrent, overvoltage, undervoltage, electric leakage and the like, and can also realize the functions of normal turn-off and zero-current start of the direct-current solid-state circuit breaker. In addition, the energy storage capacitor and the resonance parameter used in the method are designed only by referring to the overcurrent protection requirement, so that the volume and the cost of the direct current solid-state circuit breaker are greatly reduced, and the reliability of the direct current solid-state circuit breaker is improved.
The present disclosure has been described in terms of the above-described embodiments, which are merely exemplary of the implementations of the present disclosure. It must be noted that the disclosed embodiments do not limit the scope of the disclosure. Rather, variations and modifications are possible within the spirit and scope of the disclosure, and these are all within the scope of the disclosure.
Claims (10)
- A direct current solid state circuit breaker, comprising:a short-circuit protection unit comprising:a first energy storage capacitor;a first current-limiting inductor having a first terminal coupled to the first end of the first energy-storage capacitor and a second terminal coupled to a first terminal of a load;a first power diode, the cathode of which is coupled to the second end of the first current-limiting inductor;a second energy storage capacitor, wherein the first end of the second energy storage capacitor is connected with the anode of the first power diode;a second current-limiting inductor, wherein a first end of the second current-limiting inductor is coupled to a second end of the second energy-storing capacitor, and a second end of the second current-limiting inductor is coupled to a second end of the load;a second power diode, wherein the anode of the second power diode is coupled to the second end of the second current-limiting inductor, and the cathode of the second power diode is coupled to the second end of the first energy-storing capacitor;a charge switch unit comprising:a first charging branch, both ends of which are coupled with both poles of the first power diode respectively;a second charging branch, both ends of which are coupled with both poles of the second power diode respectively;a main switching unit comprising:the first pole of the main switching thyristor is coupled with a direct current power supply; when a first fault occurs on the load side, the first energy storage capacitor and the second energy storage capacitor apply a reverse voltage to the second pole of the main switch thyristor to force the main switch thyristor to be turned off.
- The direct current solid state circuit breaker of claim 1, further comprising:and the auxiliary switch unit is connected with the main switch thyristor in parallel and used for providing a natural zero crossing point of current for the main switch thyristor when a second fault occurs on the load side or a normal disconnection request exists.
- The direct current solid state circuit breaker of claim 2, wherein the first fault is a short circuit fault; the second fault is an overcurrent, overvoltage, undervoltage or leakage fault.
- The direct current solid state circuit breaker of claim 2, wherein the main switching unit comprises:and the anode of the first main switch thyristor is coupled with the anode of the direct current power supply, and the cathode of the first main switch thyristor is coupled with the first end of the first energy storage capacitor.
- The direct current solid state circuit breaker of claim 4, wherein the auxiliary switching unit comprises:the first energy storage capacitor;a first auxiliary switch thyristor, the anode of which is coupled with the positive pole of the DC power supply; anda first resonant inductor having a first terminal connected to the cathode of the first auxiliary switch thyristor and a second terminal coupled to the second terminal of the first energy storage capacitor.
- The direct current solid state circuit breaker according to any one of claims 2-5, characterized in that the main switching unit comprises:and the cathode of the second main switch thyristor is coupled with the negative electrode of the direct current power supply, and the anode of the second main switch thyristor is coupled with the second end of the second energy storage capacitor.
- The direct current solid state circuit breaker of claim 6, wherein the auxiliary switching unit comprises:the second energy storage capacitor;a second auxiliary switch thyristor, the cathode of which is coupled with the cathode of the DC power supply; andand a second resonant inductor, wherein a first end of the second resonant inductor is connected with the anode of the second auxiliary switch thyristor, and a second end of the second resonant inductor is coupled with the first end of the second energy storage capacitor.
- The direct current solid state circuit breaker according to claim 1, wherein the first and second charging branches comprise switching devices and/or power resistors.
- The direct current solid state circuit breaker of claim 7, wherein the thyristors are all unidirectional thyristors.
- An electrical distribution system comprising a direct current solid state circuit breaker according to any one of claims 1 to 9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510140420.4A CN106159880B (en) | 2015-03-27 | 2015-03-27 | DC solid circuit breaker and distribution system |
| CN2015101404204 | 2015-03-27 | ||
| PCT/CN2016/077567 WO2016155598A1 (en) | 2015-03-27 | 2016-03-28 | Dc solid breaker and power distribution system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107534438A true CN107534438A (en) | 2018-01-02 |
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| CN201510140420.4A Expired - Fee Related CN106159880B (en) | 2015-03-27 | 2015-03-27 | DC solid circuit breaker and distribution system |
| CN201680018811.1A Pending CN107534438A (en) | 2015-03-27 | 2016-03-28 | DC solid circuit breaker and distribution system |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510140420.4A Expired - Fee Related CN106159880B (en) | 2015-03-27 | 2015-03-27 | DC solid circuit breaker and distribution system |
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| Country | Link |
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| CN (2) | CN106159880B (en) |
| WO (1) | WO2016155598A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10389104B1 (en) * | 2015-01-09 | 2019-08-20 | Clemson University | Circuit breaker for DC circuits using coupled induction |
| CN106159880B (en) * | 2015-03-27 | 2019-07-12 | 积能环保电机工程科技有限公司 | DC solid circuit breaker and distribution system |
| CN107370119B (en) * | 2017-06-23 | 2019-06-21 | 上海交通大学 | Solid-state direct-current breaker and its control method based on capacitive energy storage |
| CN107516876A (en) * | 2017-08-07 | 2017-12-26 | 上海科梁信息工程股份有限公司 | A kind of direct current interruption device applied to flexible DC power transmission |
| CN107592101B (en) * | 2017-09-07 | 2019-06-04 | 电子科技大学 | A kind of DC solid circuit breaker based on cathode short circuit grid-controlled transistor |
| CN110071476B (en) * | 2019-04-15 | 2021-08-27 | 杭州拓深科技有限公司 | Rapid electric line fault detection and line cutting equipment and control method |
| CN112448466B (en) * | 2019-09-04 | 2023-02-28 | 台达电子工业股份有限公司 | DC non-power-off power supply device with bidirectional protection function |
| CN110752581A (en) * | 2019-11-28 | 2020-02-04 | 深圳大学 | Direct current solid-state circuit breaker |
| CN118044085A (en) | 2021-08-06 | 2024-05-14 | 经验知识策略有限公司 | DC solid state circuit breaker and DC circuit breaker system |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2016155598A1 (en) | 2016-10-06 |
| CN106159880A (en) | 2016-11-23 |
| CN106159880B (en) | 2019-07-12 |
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