CN114336509A - Solid-state direct current breaker control system and direct current system - Google Patents
Solid-state direct current breaker control system and direct current system Download PDFInfo
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Abstract
The application discloses a solid-state direct-current circuit breaker control system, which comprises a processing device, a control device and a control device, wherein the processing device is used for detecting a target electric signal of a direct-current system where a solid-state direct-current circuit breaker is located; the control device is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and if so, controlling the quick mechanical switch and the power electronic device in the hybrid direct current breaker to be switched off; or the control device is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and if so, controlling the power electronic device in the all-solid-state direct current breaker to be disconnected. The application can improve the breaking response speed of the solid-state direct-current circuit breaker, shorten the fault current cut-off time during short-circuit fault, effectively reduce the fault current and influence on a direct-current system, and because the broken fault current of the circuit breaker is small, the design of relevant devices in the solid-state direct-current circuit breaker can be optimized. The application also discloses a direct current system which has the beneficial effects.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a solid-state direct-current circuit breaker control system and a direct-current system.
Background
With the development of direct-current micro-grids, urban rail transit direct-current traction systems and ship direct-current power supply systems, the demand of high-performance high-capacity low-voltage direct-current circuit breakers is increasingly urgent, and solid-state direct-current circuit breakers integrate the advantages of large through-current of rapid mechanical switches and rapid on-off of full-control devices, and are the development trend and direction of direct-current circuit breakers in the future low-and-medium-voltage field. The solid-state direct current circuit breaker comprises power electronic devices, is mainly divided into a hybrid direct current circuit breaker and an all-solid-state direct current circuit breaker, and is used for monitoring short-circuit current under the condition of direct current short-circuit barriers of a direct current system and executing a corresponding fault protection function.
For direct current short-circuit fault protection, the core of the direct current short-circuit fault protection lies in rapidly judging fault signals and executing breaking action to rapidly cut off faults, considering the diversity and complexity of an application system, strict requirements are provided for the loss, the structure, the volume and the weight of a solid-state direct current breaker, the requirements are directly related to the magnitude of fault current during breaking, the fault current is smaller when the breaking is faster, the parameters can be correspondingly reduced, but no scheme for controlling the rapid breaking of the solid-state direct current breaker exists at present.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The purpose of the application is to provide a solid-state direct current breaker control system and a direct current system, which can improve the breaking response speed of the solid-state direct current breaker, shorten the fault current breaking time during short-circuit fault, and effectively reduce the fault current and the influence on the direct current system.
In order to solve the above technical problem, the present application provides a solid-state dc circuit breaker control system, and the solid-state dc circuit breaker is full solid-state dc circuit breaker or hybrid dc circuit breaker, includes:
the processing device is used for detecting a target electric signal of a direct current system where the solid-state direct current breaker is located and generating an indicating signal according to the target electric signal, wherein the indicating signal is an optical signal or a digital signal;
the control device is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and if so, controlling the quick mechanical switch and the power electronic device in the hybrid direct current breaker to be switched off;
or the like, or, alternatively,
and the control device is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and if so, controlling the power electronic device in the all-solid-state direct current breaker to be disconnected.
Preferably, the processing device specifically includes:
the acquisition module is used for acquiring a target electric signal of a direct current system where the solid-state direct current breaker is located;
and the conversion module is used for generating an indication signal according to the target electric signal, wherein the indication signal is an optical signal or a digital signal.
Preferably, the acquisition module is a voltage sensing device, and correspondingly, the target electrical signal is a voltage signal;
the conversion module is specifically configured to compare the voltage signal with a reference voltage signal, and generate an indication signal according to a comparison result.
Preferably, the voltage sensing device includes an inductor disposed in the dc system, and accordingly, the target electrical signal is a voltage signal corresponding to the inductor.
Preferably, the indication signal includes:
a first indication signal corresponding to the voltage signal being greater than the reference voltage signal;
the control device is specifically configured to:
when the first indication signal is received, the direct current system is judged to have a short-circuit fault, and a quick mechanical switch and a power electronic device in the hybrid direct current breaker are controlled to be switched off;
or the like, or, alternatively,
the control device is specifically configured to:
and when the first indication signal is received, judging that the direct current system has the short-circuit fault, and controlling the power electronic device in the all-solid-state direct current breaker to be disconnected.
Preferably, the acquisition module is a current transformer or a current sensor, and correspondingly, the target electrical signal is a current signal;
the conversion module is specifically configured to convert the current signal into the corresponding indication signal.
Preferably, the control device is specifically configured to:
calculating a current change rate according to the indication signal;
when the current change rate is larger than a preset value, judging that the direct current system has a short-circuit fault, and controlling a quick mechanical switch and a power electronic device in the hybrid direct current breaker to be switched off;
or the like, or, alternatively,
the control device is specifically configured to:
calculating a current change rate according to the indication signal;
and when the current change rate is larger than the preset value, judging that the direct current system has a short-circuit fault, and controlling the power electronic device in the all-solid-state direct current breaker to be switched off.
Preferably, the control device is specifically configured to:
when the direct current system is judged to have a short-circuit fault according to the indication signal, controlling a power electronic device in the hybrid direct current breaker to be conducted;
when a conduction feedback signal of the power electronic device is received, a quick mechanical switch in the hybrid direct current breaker is controlled to be switched off;
and when the quick mechanical switch in-place signal is received, the power electronic device in the hybrid direct current breaker is controlled to be switched off.
Preferably, the conversion module includes a photoelectric conversion module.
Preferably, the photoelectric conversion module includes a first resistor, a second resistor, a first diode, a second diode, and an optical fiber transmitting port, wherein:
the first end of the first resistor and the cathode of the first diode are both connected with the acquisition module, the second end of the first resistor and the first end of the second resistor are both connected with the anode of the second diode, the second end of the second resistor and the anode of the first diode are both connected with the first end of the optical fiber sending port, and the cathode of the second diode is connected with the second end of the optical fiber sending port.
Preferably, the control device is an FPGA.
Preferably, the control device is a DSP.
In order to solve the above technical problem, the present application further provides a dc system including the solid-state dc circuit breaker control system as described in any one of the above.
The application provides a solid-state DC breaker control system, a processing device converts the acquired target electrical signal of a DC system where a solid-state DC breaker is located into an optical signal or a digital signal, the control device judges whether the DC system has a short-circuit fault according to the received optical signal or the digital signal, thereby controlling the quick mechanical switch and the power electronic device in the hybrid DC breaker to break or controlling the power electronic device in the all-solid-state DC breaker to break, the data interaction between the processing device and the control device is completed through the digital signal or the optical signal, the signal transmission speed and effectiveness are improved because the transmission and the processing of analog signals do not exist, the signal processing and the breaking control of the solid-state DC breaker are realized by a hardware circuit, the breaking response speed is further improved, and the fault current breaking time during the short-circuit fault is shortened, the method can effectively reduce the fault current and the influence on the direct current system, and the design of relevant device parameters in the solid-state direct current circuit breaker can be correspondingly reduced because the fault current of the breaker breaking is small. The application also provides a direct current system which has the same beneficial effect as the solid-state direct current breaker control system.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a solid-state dc circuit breaker control system provided in the present application;
fig. 2 is a schematic structural diagram of another solid-state dc breaker control system provided in the present application;
fig. 3 is a schematic structural diagram of another solid-state dc breaker control system provided in the present application;
fig. 4 is a schematic structural diagram of a hybrid dc circuit breaker provided in the present application;
fig. 5 is a schematic structural diagram of another solid-state dc breaker control system provided in the present application;
fig. 6 is a schematic structural diagram of another solid-state dc breaker control system provided in the present application;
fig. 7 is a schematic structural diagram of another solid-state dc breaker control system provided in the present application;
fig. 8 is a schematic structural diagram of another solid-state dc breaker control system provided in the present application;
fig. 9 is a schematic structural diagram of another solid-state dc breaker control system provided in the present application;
fig. 10 is a schematic structural diagram of a photoelectric conversion module provided in this embodiment of the present application.
Detailed Description
The core of the application is to provide a solid-state direct current breaker control system and a direct current system, which can improve the breaking response speed of the solid-state direct current breaker, shorten the fault current breaking time during short-circuit fault, effectively reduce the fault current and influence on the direct current system, and correspondingly reduce the design of relevant device parameters in the solid-state direct current breaker due to the small breaking fault current of the breaker.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 and fig. 2, fig. 1 and fig. 2 are respectively schematic structural diagrams of two solid-state dc circuit breaker control systems provided in an embodiment of the present application, where fig. 1 is directed to a hybrid dc circuit breaker, and fig. 2 is directed to an all-solid-state dc circuit breaker, the solid-state dc circuit breaker control system includes:
the processing device 1 is used for detecting a target electric signal of a direct current system where the solid-state direct current breaker is located and generating an indicating signal according to the target electric signal, wherein the indicating signal is an optical signal or a digital signal;
the control device 2 is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and if so, controlling the quick mechanical switch and the power electronic device in the hybrid direct current breaker to be switched off;
or the like, or, alternatively,
and the control device 2 is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and controlling the power electronic device in the all-solid-state direct current breaker to be disconnected if the direct current system has the short-circuit fault.
Specifically, the solid-state dc circuit breaker may include an all-solid-state dc circuit breaker or a hybrid dc circuit breaker, the hybrid dc circuit breaker includes a power electronic device and a fast mechanical switch, and the all-solid-state dc circuit breaker only includes the power electronic device and does not include the fast mechanical switch.
Specifically, the processing device 1 is disposed in a direct current system where the solid-state direct current breaker is located, and is configured to detect a target electrical signal in the direct current system, where the target electrical signal includes, but is not limited to, a voltage signal, a current signal, and the like. The processing device 1 converts the collected target electrical signal into a corresponding indication signal, where the indication signal may be an optical signal or a digital signal. Referring to fig. 3, the processing apparatus 1 includes an acquisition module 11 and a conversion module 12, and fig. 3 illustrates a hybrid dc circuit breaker as an example, it can be understood that the all-solid-state dc circuit breaker does not include a fast mechanical switch, and the rest of the same principle applies. The acquisition module 11 is used for acquiring a target electrical signal of a direct current system where the solid-state direct current breaker is located, and the conversion module 12 is used for generating a corresponding indication signal according to the target electrical signal and performing data interaction through an optical signal or a digital signal, so that no analog signal transmission or processing exists between the processing device 1 and the control device 2, and the signal transmission speed and effectiveness are improved.
Specifically, the control device 2 judges whether a short-circuit fault exists in the direct-current system according to the received indication signal, if the short-circuit fault exists, the solid-state direct-current circuit breaker needs to be quickly disconnected, and at this time, for the all-solid-state direct-current circuit breaker, the control device 2 controls the power electronic device inside the all-solid-state direct-current circuit breaker to be disconnected so as to cut off the direct-current short-circuit fault in the direct-current system and reduce direct-current short-circuit fault current; for the hybrid direct current circuit breaker, the control device 2 controls the power electronic device and the rapid mechanical switch in the hybrid direct current circuit breaker to be switched off, so that the direct current short-circuit fault in a direct current system is cut off, and the direct current short-circuit fault current is reduced. The control device 2 may be implemented by selecting an FPGA (Field Programmable Gate Array) or a DPS (Digital Signal Processor).
Fig. 4 is a schematic structural diagram of a hybrid dc circuit breaker according to an embodiment of the present disclosure, V1 and V2 may be power electronic branches formed by IGBTs (Insulated Gate Bipolar transistors) or IGCTs (Integrated Gate-Commutated thyristors) or IEGT (Injection Enhanced Gate transistors) and FRDs (Fast Recovery diodes), KM is a Fast mechanical switch, a resistor R and a capacitor C form an RC voltage limiting device, and Cn is an intermediate dc supporting capacitor. When the power electronic device is disconnected, the RC voltage limiting device and the MOV energy absorbing device work, the RC voltage limiting device is used for overvoltage absorption, and the MOV energy absorbing device is used for energy absorption and voltage limitation.
It can be understood that, because the processing device 1 and the control device 2 in the present application are implemented by hardware circuits, the purpose of fast response can be achieved, thereby shortening the time for cutting off the fault current during short-circuit fault, effectively reducing the fault current, so that the influence degree of the short-circuit fault on the dc system is reduced, because the fault current cut off by the solid-state dc circuit breaker is small, the cut-off capacity of the semiconductor device inside the solid-state dc circuit breaker can be reduced, the cut-off overvoltage requirement, that is, the voltage and current grades of the semiconductor device in the same dc system can be reduced, and the loss of the device is further reduced. Because the short-circuit current reduces, MOV energy-absorbing device energy-absorbing will be the current square multiple and reduce, MOV energy-absorbing device's volume also can reduce correspondingly, because the overvoltage requirement reduces, also can reduce correspondingly to RC voltage limiting device's design requirement, structure volume to effectively reduce solid-state circuit breaker cost, structure, volume and weight, more be favorable to mechanical installation, use reliability also can obtain guaranteeing.
It can be seen that, in this embodiment, the processing device 1 converts the obtained target electrical signal of the dc system where the solid-state dc breaker is located into an optical signal or a digital signal, the control device 2 determines whether the dc system has a short-circuit fault according to the received optical signal or the digital signal, so as to control the fast mechanical switch and the power electronic device in the hybrid dc breaker to break or control the power electronic device in the all-solid-state dc breaker to break, and complete data interaction between the processing device 1 and the control device 2 through the digital signal or the optical signal, because there is no transmission and processing of analog signals, the signal transmission speed and effectiveness are improved, the signal processing and breaking control of the solid-state dc breaker are realized by a hardware circuit, the breaking response speed is further improved, thereby shortening the fault current breaking time during short-circuit fault, and effectively reducing the fault current and the influence on the dc system, due to the fact that the fault current of the breaker in breaking is small, the design of relevant devices in the solid-state direct current breaker can be optimized.
On the basis of the above-described embodiment:
as a preferred embodiment, the acquisition module 11 is a voltage sensing device, and correspondingly, the target electrical signal is a voltage signal;
the conversion module 12 is specifically configured to compare the voltage signal with a reference voltage signal, and generate an indication signal according to a comparison result.
As a preferred embodiment, the indication signal comprises:
a first indication signal corresponding to the voltage signal being greater than the reference voltage signal;
the control device 2 is specifically configured to:
when a first indicating signal is received, judging that a short-circuit fault exists in the direct-current system, and controlling a quick mechanical switch and a power electronic device in the hybrid direct-current circuit breaker to be switched off;
or the like, or, alternatively,
the control device 2 is specifically configured to:
and when the first indication signal is received, judging that the direct current system has a short-circuit fault, and controlling the power electronic device in the all-solid-state direct current breaker to be switched off.
Specifically, in this embodiment, the current change rate is relatively high when considering the fault, and when passing through the inductance or the stray inductance in the main circuit of the dc system, a higher voltage signal is induced correspondingly, so that the voltage induction device in the present application includes the inductance arranged in the dc system, and the target electrical signal is a voltage signal corresponding to the inductance, so as to determine whether there is a short circuit abnormality in the dc system through the voltage signal. Accordingly, the conversion module 12 may include a voltage signal processing module for analog-to-digital conversion of the target electrical signal and/or a photoelectric conversion module for photoelectric conversion of the target electrical signal. Specifically, referring to fig. 5, an inductor is provided in the dc system, the secondary side is an extension of the inductor, and the voltage on the inductor of the extension is collected as a target electrical signal; referring to fig. 6, when an inductor is present in the dc system, collecting the full voltage of the inductor as a target electrical signal, and when no inductor is present in the dc system, collecting the part of the dc system with a large parasitic inductance, and collecting the full voltage of the inductor as a target electrical signal; referring to fig. 7, an inductor is already provided in the dc system, and a partial voltage of the inductor is collected as a target electrical signal. Of course, other ways than the above-mentioned way may be adopted to obtain the voltage signal in the dc system, and the present application is not limited thereto, and fig. 5 to fig. 7 take a hybrid dc circuit breaker as an example, and the all-solid-state dc circuit breaker does not include a fast mechanical switch, as shown in fig. 8.
Specifically, the conversion module 12 compares the received voltage signal with a built-in reference voltage signal, and generates a corresponding indication signal according to a comparison result, that is, when the actually acquired voltage signal is greater than the reference voltage signal, a first indication signal is generated, when the actually acquired voltage signal is less than or equal to the reference voltage signal, a second indication signal is generated, the control device 2 receives the second indication signal, determines that the dc system does not have a short-circuit fault, the control device 2 determines that the dc system has a short-circuit fault when receiving the first indication signal, controls a fast mechanical switch and a power electronic device in the hybrid dc circuit breaker to be disconnected, or controls the power electronic device in the all-solid dc circuit breaker to be disconnected, wherein the first indication signal may be 1, the second indication signal may be 0, and the scheme of the present embodiment does not require any processing of the control device 2 on the actual voltage signal, the data processing amount of the control device 2 is reduced, after the signals 0 and 1 are received, the signals can quickly respond according to the corresponding logics of the signals 0 and 1, the breaking speed of the solid-state direct-current circuit breaker is further improved, the inductor in the acquisition module 11 is the existing inductor in a direct-current system, the hardware cost and the size are further reduced, meanwhile, the current change rate of a main circuit of the direct-current system is converted into a voltage signal through a hardware circuit, and the signal acquisition efficiency is further improved.
As a preferred embodiment, the acquisition module 11 may be a current transformer or a current sensor, and accordingly, the target electrical signal is a current signal;
the conversion module 12 is specifically configured to convert the current signal into a corresponding indication signal.
As a preferred embodiment, the control device 2 is specifically configured to:
calculating a current change rate according to the indication signal;
when the current change rate is larger than a preset value, judging that the direct current system has a short-circuit fault, and controlling a quick mechanical switch and a power electronic device in the hybrid direct current breaker to be switched off;
or the like, or, alternatively,
the control device 2 is specifically configured to:
calculating a current change rate according to the indication signal;
and when the current change rate is larger than a preset value, judging that the direct current system has a short-circuit fault, and controlling the power electronic device in the all-solid-state direct current breaker to be switched off.
Specifically, in this embodiment, in consideration of a large current change rate during a fault, the acquisition module 11 directly acquires a current signal in the main circuit of the dc system by using a current sensor or a current transformer, as shown in fig. 9, fig. 9 illustrates a hybrid dc circuit breaker as an example, and the all-solid-state dc circuit breaker does not include a fast mechanical switch, and the rest is the same. Correspondingly, the conversion module 12 may include a current signal conditioning module and an optical fiber communication device, the conversion module 12 transmits a circuit signal acquired by a current sensor or a current transformer to the control device 2, the control device 2 calculates a current change rate according to the acquired current signal, and compares the actual current change rate with a preset value to determine whether a short-circuit overcurrent fault exists in the dc system, specifically, when the calculated current change rate is greater than the preset value, it is determined that the short-circuit fault exists in the dc system, and the control device 2 controls a fast mechanical switch and a power electronic device in the hybrid dc circuit breaker to be disconnected, or the control device 2 controls the power electronic device in the all-solid-state dc circuit breaker to be disconnected.
As a preferred embodiment, the acquisition module 11, the conversion module 12 and the control device 2 are connected by hard wires or optical fibers to realize digital signal DI \ DO or optical signal transmission, and because there is no analog signal transmission and processing, the rapidity can be effectively ensured.
As a preferred embodiment, the control device 2 is specifically configured to:
when the direct current system is judged to have a short-circuit fault according to the indication signal, controlling the conduction of a power electronic device in the hybrid direct current breaker;
when a conduction feedback signal of the power electronic device is received, a quick mechanical switch in the hybrid direct current breaker is controlled to be switched off;
and when the quick mechanical switch in-place signal is received, the power electronic device in the hybrid direct current breaker is controlled to be switched off.
Specifically, when the control device 2 determines that the direct current system has a short-circuit fault according to the indication signal, the power electronic device in the hybrid direct current circuit breaker is controlled to be on, after the power electronic device is on, the control device 2 can acquire a conduction feedback signal of the power electronic device, at the moment, the fast mechanical switch in the hybrid direct current circuit breaker is controlled to be disconnected, when the control device 2 receives an in-place signal of the fast mechanical switch and is effective, the power electronic device in the hybrid direct current circuit breaker is controlled to be disconnected, when the control device 2 receives a disconnection feedback signal of the power electronic device, the disconnection process is finished, and by adopting the logic, the internal arcing of the fast mechanical switch can be prevented in the disconnection process of the hybrid direct current circuit breaker.
Specifically, in an initial state of a breaking process of the all-solid-state direct current circuit breaker, the power electronic device inside the all-solid-state direct current circuit breaker is closed, when the control device 2 judges that the direct current system has a short-circuit fault according to the indication signal, the power electronic device inside the all-solid-state direct current circuit breaker is directly controlled to break, and when the control device 2 receives a breaking feedback signal of the power electronic device, the breaking process is finished.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a photoelectric conversion module provided in this embodiment, where the photoelectric conversion module includes a first resistor, a second resistor, a first diode, a second diode, and an optical fiber transmitting port, where:
the first end of the first resistor and the cathode of the first diode are both connected with the acquisition module 11, the second end of the first resistor and the first end of the second resistor are both connected with the anode of the second diode, the second end of the second resistor and the anode of the first diode are both connected with the first end of the optical fiber sending port, and the cathode of the second diode is connected with the second end of the optical fiber sending port.
Specifically, after the collected voltage signal U is divided by the first resistor R1 and the second resistor R2, the voltage at two ends of R2 is applied to the second diode D2 and the optical fiber transmitting port to obtain an optical signal, in this embodiment, the first diode D1 is provided to prevent the second resistor R2 from generating a back voltage.
In another aspect, the present application also provides a dc system comprising a solid state dc breaker control system as in any of the above.
For the introduction of a dc system mentioned in the present application, please refer to the above embodiments, which are not described herein again.
The direct current system has the same beneficial effects as the solid-state direct current breaker control system.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. The utility model provides a solid-state direct current breaker control system, solid-state direct current breaker are full solid-state direct current breaker or hybrid direct current breaker, its characterized in that includes:
the processing device is used for detecting a target electric signal of a direct current system where the solid-state direct current breaker is located and generating an indicating signal according to the target electric signal, wherein the indicating signal is an optical signal or a digital signal;
the control device is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and if so, controlling the quick mechanical switch and the power electronic device in the hybrid direct current breaker to be switched off;
or the like, or, alternatively,
and the control device is used for judging whether the direct current system has a short-circuit fault according to the indication signal, and if so, controlling the power electronic device in the all-solid-state direct current breaker to be disconnected.
2. The solid state dc circuit breaker control system of claim 1, wherein the processing device specifically comprises:
the acquisition module is used for acquiring a target electric signal of a direct current system where the solid-state direct current breaker is located;
and the conversion module is used for generating an indication signal according to the target electric signal, wherein the indication signal is an optical signal or a digital signal.
3. The solid state dc circuit breaker control system of claim 2, wherein the collection module is a voltage sensing device, and accordingly, the target electrical signal is a voltage signal;
the conversion module is specifically configured to compare the voltage signal with a reference voltage signal, and generate an indication signal according to a comparison result.
4. The solid state dc circuit breaker control system of claim 3, wherein the voltage sensing device comprises an inductor disposed in the dc system, and accordingly, the target electrical signal is a voltage signal corresponding to the inductor.
5. The solid state direct current circuit breaker control system of claim 3, wherein the indication signal comprises:
a first indication signal corresponding to the voltage signal being greater than the reference voltage signal;
the control device is specifically configured to:
when the first indication signal is received, the direct current system is judged to have a short-circuit fault, and a quick mechanical switch and a power electronic device in the hybrid direct current breaker are controlled to be switched off;
or the like, or, alternatively,
the control device is specifically configured to:
and when the first indication signal is received, judging that the direct current system has the short-circuit fault, and controlling the power electronic device in the all-solid-state direct current breaker to be disconnected.
6. The solid state dc circuit breaker control system of claim 2, wherein the collection module is a current transformer or a current sensor, and accordingly, the target electrical signal is a current signal;
the conversion module is specifically configured to convert the current signal into the corresponding indication signal.
7. The solid state direct current circuit breaker control system of claim 6, wherein the control device is specifically configured to:
calculating a current change rate according to the indication signal;
when the current change rate is larger than a preset value, judging that the direct current system has a short-circuit fault, and controlling a quick mechanical switch and a power electronic device in the hybrid direct current breaker to be switched off;
or the like, or, alternatively,
the control device is specifically configured to:
calculating a current change rate according to the indication signal;
and when the current change rate is larger than the preset value, judging that the direct current system has a short-circuit fault, and controlling the power electronic device in the all-solid-state direct current breaker to be switched off.
8. The solid state direct current circuit breaker control system of any one of claims 1 to 7, wherein the control device is specifically configured to:
when the direct current system is judged to have a short-circuit fault according to the indication signal, controlling a power electronic device in the hybrid direct current breaker to be conducted;
when a conduction feedback signal of the power electronic device is received, a quick mechanical switch in the hybrid direct current breaker is controlled to be switched off;
and when the quick mechanical switch in-place signal is received, the power electronic device in the hybrid direct current breaker is controlled to be switched off.
9. The solid state direct current circuit breaker control system of claim 2, wherein the conversion module comprises a photoelectric conversion module.
10. The solid state dc circuit breaker control system of claim 9, wherein the photoelectric conversion module comprises a first resistor, a second resistor, a first diode, a second diode, and a fiber launch port, wherein:
the first end of the first resistor and the cathode of the first diode are both connected with the acquisition module, the second end of the first resistor and the first end of the second resistor are both connected with the anode of the second diode, the second end of the second resistor and the anode of the first diode are both connected with the first end of the optical fiber sending port, and the cathode of the second diode is connected with the second end of the optical fiber sending port.
11. The solid state dc circuit breaker control system of claim 1, wherein the control device is an FPGA.
12. The solid state dc circuit breaker control system of claim 1, wherein the control device is a DSP.
13. A dc system comprising a solid state dc circuit breaker control system according to any of claims 1 to 12.
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Cited By (1)
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| WO2023077319A1 (en) * | 2021-11-03 | 2023-05-11 | 华为数字能源技术有限公司 | Switch device, circuit breaker, and power supply system |
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