CN213461119U - Direct current power supply system - Google Patents
Direct current power supply system Download PDFInfo
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- CN213461119U CN213461119U CN202021881259.9U CN202021881259U CN213461119U CN 213461119 U CN213461119 U CN 213461119U CN 202021881259 U CN202021881259 U CN 202021881259U CN 213461119 U CN213461119 U CN 213461119U
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Abstract
The utility model discloses a DC power supply system, which comprises a first power supply unit, a second power supply unit and at least one fault isolation unit; the fault isolation unit is provided with a current detection module and a voltage detection module, and when the direct-current bus is short-circuited, the fault isolation unit can timely disconnect an internal isolating switch according to a detected voltage value and a detected current value, so that short-circuit fault isolation is realized. Compared with the technical scheme that the current value of each position on the bus is only detected in the prior art, the direct current power supply system can effectively avoid the problem that fault protection is preferentially executed at non-fault points due to the fact that the error of the current value detected at each position on the direct current bus is large due to difference of technical parameters of components and parts, uncertain interference on the direct current bus and the like, improves the fault isolation accuracy and further effectively improves the power supply stability. The utility model discloses but wide application is in the electric power technology field.
Description
Technical Field
The utility model belongs to the technical field of the electric power technique and specifically relates to a direct current power supply system.
Background
Currently, in order to reduce the line loss of power transmission and improve the stability of power supply, a large number of direct-current power supply systems with double-end power supply are used in many fields. However, the power supply system can only ensure stable power supply when a single-end power supply unit fails, once a short-circuit fault occurs at any point on a transmission line between two power supply units, the power supply units at two ends usually make a short-circuit protection measure for safety, namely stop output, but in this way, power failure of the whole power distribution network is caused, and great loss is caused to users.
In order to solve the above problems, in the prior art, an intelligent controller is provided at each electrical device in a double-ended dc power supply system, and the intelligent controller performs a dc bus short-circuit fault isolation function, so that a short-circuit section of a transmission line is isolated in time when a short circuit occurs on the transmission line, thereby ensuring the stability of circuit power supply. However, the intelligent controller generally adopts a current judgment method, that is, when a certain point of the dc bus is short-circuited, it is judged that the current flowing through the dc bus is short-circuited when the current is larger than the overcurrent protection threshold, and then the intelligent controller controls the internal switching device to be turned off, thereby realizing short-circuit fault isolation. Due to the difference of component parameters in the power system, the error of the detected current value at each position on the direct current bus is likely to be larger, so that the intelligent controller at a non-fault point is protected by priority rather than the intelligent controller at a fault point, the fault isolation accuracy is poor, and the power distribution stability is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to at least solve one of the technical problem that exists among the prior art to a certain extent.
Therefore, an object of the embodiments of the present invention is to provide a dc power supply system, which can improve the accuracy of fault isolation, and further effectively improve the stability of power supply.
In order to achieve the technical purpose, the embodiment of the present invention adopts a technical solution including:
the embodiment of the utility model provides a direct current power supply system for the consumer provides the power, include:
the system comprises a first power supply unit, a second power supply unit and at least one fault isolation unit;
the fault isolation unit comprises a voltage detection module, a current detection module, a control module and an isolating switch; the voltage detection module is used for detecting the voltage at the corresponding isolating switch, and the current detection module is used for detecting the current flowing through the corresponding isolating switch; the isolating switch comprises a first end and a second end, and the first end and the second end are used for being connected with the electric equipment; the control module is connected with the voltage detection module, the current detection module and the isolating switch and is used for controlling the on-off of the isolating switch;
the first power supply unit is connected with the second power supply unit through the isolating switch.
In addition, according to the dc power supply system of the above embodiment of the present invention, the following additional technical features may be further provided:
further, in an embodiment of the present invention, the dc power supply system further includes a first dc bus and a second dc bus;
the first power supply unit is connected to the second power supply unit through the first direct current bus and the second direct current bus;
the isolating switch is arranged on the first direct current bus or the second direct current bus.
Further, in an embodiment of the present invention, the first dc bus includes a first bus port and a second bus port, and the second dc bus includes a third bus port and a fourth bus port;
the first bus bar port and the third bus bar port are connected to the first power supply unit, and the second bus bar port and the fourth bus bar port are connected to the second power supply unit.
Further, in an embodiment of the present invention, the fault isolation unit further includes a first diode and a second diode;
the first end is used for being connected with the electric equipment through the first diode, and the second end is used for being connected with the electric equipment through the second diode.
Further, in an embodiment of the present invention, the first dc bus is a positive dc bus, and the second dc bus is a negative dc bus; the isolating switch is arranged on the first direct current bus;
the first end is connected to the anode of the first diode, the cathode of the first diode is used for being connected with the electric equipment, the second end is connected to the anode of the second diode, and the cathode of the second diode is used for being connected with the electric equipment.
Further, in an embodiment of the present invention, the current detection module detects the current through a resistor, a hall current sensor, or a current transformer.
Further, in an embodiment of the present invention, the isolation switch is at least one of a metal-oxide semiconductor field effect transistor, an insulated gate bipolar transistor, a semiconductor triode, a thyristor, a turn-off thyristor, an integrated gate commutated thyristor, an electron injection enhancement gate transistor, a MOS-controlled thyristor, a bidirectional thyristor, a reverse conducting thyristor, an IGBT, a CoolMOS, a static induction transistor, a static induction thyristor, a relay, or a contactor.
Advantages and benefits of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention:
the utility model discloses a DC power supply system, its fault isolation unit is provided with current detection module and voltage detection module, and when the direct current generating line short circuit, fault isolation unit can in time break off inside isolator according to the voltage value and the current value that detect, realizes short circuit fault isolation. Compared with the technical scheme that the current value of each position on the bus is only detected in the prior art, the direct current power supply system can effectively avoid the problem that fault protection is preferentially executed at non-fault points due to the fact that the error of the current value detected at each position on the direct current bus is large due to difference of technical parameters of components and parts, uncertain interference on the direct current bus and the like, improves the fault isolation accuracy and further effectively improves the power supply stability.
Drawings
Fig. 1 is a schematic diagram of a dc power supply system including a fault isolation unit according to the present invention;
fig. 2 is a schematic diagram of a dc power supply system including two fault isolation units according to the present invention;
fig. 3 is a schematic diagram of a circuit principle that the dc power supply system provided by the present invention includes two fault isolation units.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "length", "upper", "lower", "front", "rear", "left", "right", "top", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model provides an application embodiment provides a direct current power supply system for the consumer provides the power, this direct current power supply system includes:
the system comprises a first power supply unit, a second power supply unit and at least one fault isolation unit;
referring to fig. 1, fig. 1 is a minimal embodiment of the present application: the direct current power supply system comprises a fault isolation unit, wherein the fault isolation unit comprises a voltage detection module, a current detection module, a control module and an isolation switch; the voltage detection module is used for detecting the voltage at the corresponding isolating switch, and the current detection module is used for detecting the current flowing through the corresponding isolating switch; the isolating switch comprises a first end and a second end, and the first end and the second end are used for being connected with electric equipment; the control module is connected with the voltage detection module, the current detection module and the isolating switch and is used for controlling the on-off of the isolating switch;
the first power supply unit is connected with the second power supply unit through the isolating switch.
Optionally, referring to fig. 2, the dc power supply system in the embodiment of the present application may also include two fault isolation units, and each fault isolation unit also includes a voltage detection module, a current detection module, a control module, and an isolation switch. In the embodiment of the present application, for the purpose of description differentiation, the fault isolation units are respectively denoted as a first fault isolation unit 1 and a second fault isolation unit 2, where the first fault isolation unit 1 includes a first voltage detection module, a first current detection module, a first control module and a first isolation switch 110, and the second fault isolation unit 1 includes a second voltage detection module, a second current detection module, a second control module and a second isolation switch 210. The first fault isolation unit 1 is taken as an example for explanation: the first voltage detection module is configured to detect a voltage at the first isolating switch 110, and the first current detection module is configured to detect a current flowing through the first isolating switch 110, specifically, the current detection module may detect a current through a hall current sensor or a current transformer, and the voltage detection module may detect a voltage through a resistor; the first isolation switch 110 comprises a first end 1101 and a second end 1102, wherein the first end 1101 and the second end 1102 are used for connecting with electric equipment; the first control module is connected to the first voltage detection module, the first current detection module and the first isolating switch 110, and the first control module is used for controlling the on/off of the first isolating switch 110. The second fault isolation unit 2 is similar thereto and will not be described in detail here. Finally, the first power supply unit is connected with the second power supply unit through the isolating switches in the fault isolating units. Based on the above description, those skilled in the art can understand that the number of the fault isolation units in the embodiment of the present application may also be any number greater than 2, such as three, four, and the like. Optionally, the isolation switch in the embodiment of the present application may be formed by using at least one of a metal-oxide semiconductor field effect transistor, an insulated gate bipolar transistor, a semiconductor triode, a silicon controlled thyristor, a turn-off thyristor, an integrated gate commutated thyristor, an electron injection enhancement gate transistor, an MOS controlled thyristor, a bidirectional thyristor, a reverse conducting thyristor, an IGBT, a CoolMOS, a static induction transistor, a static induction thyristor, a relay, or a contactor. The Control module may be formed by at least one integrated Device, such as a comparator, an operational amplifier, a Micro Control Unit (MCU), a Digital Signal Processor (DSP), a Logic circuit, a Field-Programmable Gate Array (FPGA), and a Complex Programmable Logic Device (CPLD).
The following description will be made on the operating principle of the dc power supply system in the present application with reference to fig. 1 and 2:
in the dc power supply system according to the embodiment of the present application, the fault isolation unit is provided with a current detection module and a voltage detection module, taking the dc power supply system shown in fig. 1 as an example: when the transmission line between the first power supply unit and the second power supply unit powered by two ends is short-circuited, the current on the transmission line between the fault isolation unit and the second power supply unit in fig. 1 will rise instantaneously, and the voltage on the transmission line drops suddenly from the short-circuit point to the two ends. In normal operation, the isolating switch in fig. 1 is closed, and both the first power supply unit and the second power supply unit can supply power to the electric equipment; when a short-circuit fault occurs as shown in fig. 1, the isolating switch is turned off, the second power supply unit stops supplying power to the electric equipment, and the first power supply unit supplies power to the electric equipment independently.
Taking the dc power supply system shown in fig. 2 as an example: in fig. 2, a short circuit occurs between the first fault isolation unit 1 and the second fault isolation unit 2, at this time, the current on the transmission line will rise instantaneously, the voltage on the transmission line drops suddenly from the short circuit point to both ends in sequence, the current value at the fault isolation unit closest to the short circuit point generally rises fastest, and the voltage value at the fault isolation unit closest to the short circuit point falls fastest. The fault isolation unit in the embodiment of the application can effectively detect the current value and the voltage value of the transmission line, and controls the action of the isolation switch to isolate the short-circuit point when the current value and the voltage value reach the threshold values by setting the corresponding overcurrent protection threshold value (larger than the normal current value) and the corresponding voltage threshold value (smaller than the normal voltage value). In the dc power supply system in fig. 2, both the first isolating switch 110 and the second isolating switch 210 are closed during normal operation, and when a short-circuit point occurs between the first fault isolating unit 1 and the second fault isolating unit 2, both the first isolating switch 110 and the second isolating switch 210 are opened, at this time, for the first electrical device, it can also take power from the first power supply unit, for the second electrical device, it can also take power from the second power supply unit, and the short-circuit point between the first power supply unit and the second power supply unit is also isolated, so the power supply system can still maintain stable power supply.
In this embodiment of the application, in practical application, a plurality of fault isolation units may be disposed on the transmission line, for example, other fault isolation units are further included between the first fault isolation unit 1 and the first power supply unit in fig. 2, and other fault isolation units are also included between the second fault isolation unit 2 and the second power supply unit. At this time, when there are a plurality of fault isolation units, each fault isolation unit simultaneously detects current values and voltage values at different positions on the transmission line, and if there is a short-circuit fault between the first fault isolation unit 1 and the second fault isolation unit 2, the distance to the short-circuit point is closer than that of the other fault isolation units, so that it can be detected earlier that the overcurrent protection threshold and the voltage threshold are reached, and the first isolation switch 110 and the second isolation switch 210 are turned off first. Compared with the implementation mode that the current value of each position is only detected to determine which position the disconnecting switch is disconnected in the prior art, the current value and the voltage value of each position are used as the basis for judgment, so that the problem that fault protection is preferentially executed by a fault isolation unit at a non-fault point due to large error of the current value detected at each position caused by difference of technical parameters of components and parts, uncertain interference on a transmission line and the like can be effectively avoided, and the fault isolation accuracy is improved.
Referring to fig. 3, in the embodiment of the present application, a dc power supply system including two dc buses, one of which is a positive dc bus and the other is a negative dc bus, is described as an example. In the embodiment of the present application, two dc buses of a power supply system are a first dc bus 3 and a second dc bus 4, respectively, where the first dc bus 3 includes a first bus port 301 and a second bus port 302, and the second dc bus 4 includes a third bus port 401 and a fourth bus port 402; first bus bar port 301 and third bus bar port 401 are connected to a first power supply unit, and second bus bar port 302 and fourth bus bar port 402 are connected to a second power supply unit.
For each fault isolation unit, the voltage detection module is configured to detect a voltage of one end of the isolator relative to the dc bus that is not connected to the isolator, where the one end may be a first end or a second end, and if the isolator is installed on the first dc bus 3, detect a voltage of one end of the isolator relative to the second dc bus 4, and if the isolator is installed on the second dc bus 4, detect a voltage of one end of the isolator relative to the first dc bus 3. The current detection module is used for detecting the current flowing through the isolating switch, the isolating switch can be arranged on the first direct current bus 3 or the second direct current bus 4, the current detection module can be arranged on the same direct current bus as the corresponding isolating switch or different direct current buses, for example, as for the embodiment in fig. 3, the first current detection module of the first fault isolating unit is arranged on the first direct current bus 3, and can be arranged on the second direct current bus 4 instead. Moreover, it can be understood by those skilled in the art that the effect of the first voltage detection module and the first current detection module on the left side or the right side of the first isolation switch 110 is substantially equivalent, and are not fixed to be set in the manner of fig. 3. The first direct current bus 3 in the embodiment of the application can be a positive direct current bus or a negative direct current bus, and when the first direct current bus 3 is the positive direct current bus, the second direct current bus 4 is the negative direct current bus; conversely, when the first dc bus 3 is a negative dc bus, the second dc bus 4 is a positive dc bus.
Optionally, the fault isolation unit in this embodiment of the present application may further include a first diode and a second diode, where the first diode and the second diode are used to enable the bus and the electrical device to flow through the power supply in a single direction, so as to prevent current of some active devices from flowing backward and affecting the stable operation of the power supply system. Based on the above-mentioned effects, those skilled in the art can understand that: when the direct current bus connected with the diode is the anode direct current bus, the anode of the diode is connected with the direct current bus, and the cathode of the diode is used for being connected with the electric equipment; conversely, when the dc bus to which the diode is connected is a negative dc bus, the negative electrode of the diode is connected to the dc bus and the positive electrode is used for connecting with the electrical equipment. Taking the power supply system in fig. 3 as an example, the first dc bus 3 is a positive dc bus, the second dc bus 4 is a negative dc bus, and the first and second disconnectors 110 and 210 are provided on the first dc bus 3. Thus, for the first diode D1 and the second diode D2, the anode of the first diode D1 is connected to the first end of the first isolation switch 110 (i.e., on the first dc bus 3), the cathode of the first diode D1 is used for connecting to the first electrical device, the anode of the second diode D2 is connected to the second end of the first isolation switch 110 (i.e., on the first dc bus 3), and the cathode of the second diode D2 is used for connecting to the first electrical device. The third diode D3 and the fourth diode D4 in the second fault isolation unit are arranged in a similar manner, and are not described in detail herein.
It is understood that the principle explanation of the contents in the embodiment of fig. 2 in the present application is applicable to the embodiment of fig. 3, and the advantages achieved by the embodiment of fig. 3 are the same as those achieved by the embodiment of fig. 2.
In the description herein, references to the description of "one embodiment," "another embodiment," or "certain embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A dc power supply system for providing power to a powered device, the dc power supply system comprising: the system comprises a first power supply unit, a second power supply unit and at least one fault isolation unit;
the fault isolation unit comprises a voltage detection module, a current detection module, a control module and an isolating switch; the voltage detection module is used for detecting the voltage at the corresponding isolating switch, and the current detection module is used for detecting the current flowing through the corresponding isolating switch; the isolating switch comprises a first end and a second end, and the first end and the second end are used for being connected with the electric equipment; the control module is connected with the voltage detection module, the current detection module and the isolating switch and is used for controlling the on-off of the isolating switch;
the first power supply unit is connected with the second power supply unit through the isolating switch.
2. The dc power supply system according to claim 1, wherein: the direct current power supply system also comprises a first direct current bus and a second direct current bus;
the first power supply unit is connected to the second power supply unit through the first direct current bus and the second direct current bus; the isolating switch is arranged on the first direct current bus or the second direct current bus.
3. The dc power supply system according to claim 2, wherein: the first dc bus includes a first bus port and a second bus port, the second dc bus includes a third bus port and a fourth bus port;
the first bus bar port and the third bus bar port are connected to the first power supply unit, and the second bus bar port and the fourth bus bar port are connected to the second power supply unit.
4. The dc power supply system according to claim 2, wherein: the fault isolation unit further comprises a first diode and a second diode;
the first end is used for being connected with the electric equipment through the first diode, and the second end is used for being connected with the electric equipment through the second diode.
5. The direct-current power supply system according to claim 4, characterized in that: the first direct current bus is a positive direct current bus, and the second direct current bus is a negative direct current bus; the isolating switch is arranged on the first direct current bus;
the first end is connected to the anode of the first diode, the cathode of the first diode is used for being connected with the electric equipment, the second end is connected to the anode of the second diode, and the cathode of the second diode is used for being connected with the electric equipment.
6. The dc power supply system according to claim 1, wherein: the current detection module detects current through a resistor, a Hall current sensor or a current transformer.
7. The direct current power supply system according to any one of claims 1 to 6, characterized in that: the isolating switch adopts at least one of a metal-oxide layer semiconductor field effect transistor, an insulated gate bipolar transistor, a semiconductor triode, a silicon controlled thyristor, a turn-off thyristor, an integrated gate commutated thyristor, an electron injection enhancement gate transistor, an MOS (metal oxide semiconductor) controlled thyristor, a bidirectional thyristor, a reverse conducting thyristor, an IGBT (insulated gate bipolar transistor), a CoolMOS (metal oxide semiconductor), a static induction transistor, a static induction thyristor, a relay or a contactor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021881259.9U CN213461119U (en) | 2020-09-01 | 2020-09-01 | Direct current power supply system |
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| CN202021881259.9U CN213461119U (en) | 2020-09-01 | 2020-09-01 | Direct current power supply system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115158015A (en) * | 2022-06-28 | 2022-10-11 | 华为数字能源技术有限公司 | Power conversion device and electric automobile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115158015A (en) * | 2022-06-28 | 2022-10-11 | 华为数字能源技术有限公司 | Power conversion device and electric automobile |
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