CN112260237A - DC Microgrid Protection Device - Google Patents
DC Microgrid Protection Device Download PDFInfo
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- CN112260237A CN112260237A CN202011009351.0A CN202011009351A CN112260237A CN 112260237 A CN112260237 A CN 112260237A CN 202011009351 A CN202011009351 A CN 202011009351A CN 112260237 A CN112260237 A CN 112260237A
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- power converter
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- ripple
- processing unit
- protection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for DC systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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Abstract
本发明涉及一种实施例提供的直流微电网保护装置，通过在电源变换器中设置纹波检测单元，用以检测电源变换器输出电流的纹波，并在直流微电网需要进行保护的时候利用控制电路控制电源变换器输出端的滤波电路使其滤波能力降低，纹波检测单元检测到电源变换器输出端的纹波电流较大时第一处理单元控制开关单元断开以控制电源变换器自主停机，从而使得直流微电网的系统保护规范化，系统保护对电源变换器自身的控制功能及通信协议等的依赖大大降低，也可以简化上位机的控制程序。
The present invention relates to a DC microgrid protection device provided in an embodiment. A ripple detection unit is provided in the power converter to detect the ripple of the output current of the power converter, and is used when the DC microgrid needs to be protected. The control circuit controls the filter circuit at the output end of the power converter to reduce its filtering capability, and the first processing unit controls the switch unit to disconnect when the ripple detection unit detects that the ripple current at the output end of the power converter is large to control the power converter to stop autonomously, Therefore, the system protection of the DC microgrid is standardized, the dependence of the system protection on the control function and communication protocol of the power converter itself is greatly reduced, and the control program of the upper computer can also be simplified.
Description
Technical Field
The invention relates to the field of direct-current micro-grid protection, in particular to a direct-current micro-grid protection device.
Background
The distributed power supply system has the advantages of flexible design, high reliability, convenience in maintenance and the like, and is widely applied to power supply systems of spacecrafts, ships, communication base stations and large computers. For a microgrid system with a distributed power supply, when the system needs to turn off the distributed power supply, a protection instruction needs to be issued to a distributed power supply converter, and the distributed power supply is protected according to the state of the system. However, in the conventional technology, the protection of the microgrid system requires the microgrid system to establish communication with the power converter, and the upper computer determines whether the power converter is required to cooperate with protection according to the current state of the microgrid system. Because the micro-grid system has different control functions according to the power converters, manufacturers have different manufacturers, and further, the communication protocols of the power converters are different. The upper computer needs to communicate with different power converters, whether the machine needs to be stopped is judged, the processing procedure of the upper computer is complex, the communication efficiency is low, and the system building progress is slow.
Disclosure of Invention
Therefore, it is necessary to provide a direct-current microgrid protection device for solving the problems that an upper computer needs to communicate with different power converters, so that the processing procedure of the upper computer is complex and the system building progress is slow.
A dc microgrid protection apparatus comprising: the control circuit, the filter circuit and the power converter;
the filter circuit is connected with the output end of the power converter and is used for filtering the output current of the power converter;
the control circuit is connected with the filter circuit and inputs direct current bias current to the filter circuit so as to reduce the filtering capability of the filter circuit;
the power converter comprises a first processing unit, a ripple detection unit and a switch unit, wherein the switch unit is connected with the first processing unit and external equipment, the first processing unit is connected with the ripple detection unit, and the ripple detection unit is connected with the filter circuit;
the ripple detection unit detects ripples of the output current of the power converter and transmits the detected ripples of the output current to the first processing unit, and the first processing unit controls the on-off of the switch unit according to the magnitude of the ripples of the output current.
In one embodiment, the power converter further includes a storage unit, connected to the first processing unit, for storing a preset current ripple interval.
In one embodiment, the switching unit includes a switching transistor.
In one embodiment, the filter circuit comprises a filter inductor, one end of the filter inductor is connected with the output end of the power converter, and the other end of the filter inductor is connected with a direct current bus.
In one embodiment, the filter circuit further includes a mutual inductance, the mutual inductance and the filter inductance are wound on the same magnetic core, and the mutual inductance is connected to the control circuit.
In one embodiment, the control circuit comprises a second processing unit and a current source, wherein the second processing unit is connected with the current source, and the current source is connected with two ends of the mutual inductance inductor.
In one embodiment, the device further comprises an upper computer which is connected with the control circuit and issues a control instruction to the control circuit.
In one embodiment, the control circuit further comprises a communication unit, which is connected with the upper computer in a communication way.
In one embodiment, the power converter comprises a dc power converter or an ac power converter.
In one embodiment, the system further comprises a distributed power supply connected with the input end of the power converter.
The dc microgrid protection device provided by the above embodiment, through set up ripple detecting element in power converter, be used for detecting the ripple of power converter output current, and utilize the filter circuit of control circuit control power converter output to make its filtering capability reduce when dc microgrid needs to protect, first processing unit control switch unit disconnection is in order to control power converter autonomous shutdown when ripple detecting element detects the ripple current of power converter output great, thereby make the system protection of dc microgrid standardize, the dependence greatly reduced of system protection to power converter's own control function and communication protocol etc. also can simplify the control program of host computer.
Drawings
Fig. 1 is a schematic diagram of a dc microgrid protection apparatus according to an embodiment of the present application;
fig. 2 is a schematic diagram of a dc microgrid protection device according to another embodiment of the present application;
fig. 3 is a schematic diagram of a dc microgrid protection device according to another embodiment of the present application;
fig. 4 is a schematic diagram of a dc microgrid protection device according to another embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In the traditional technology, the protection of the direct current micro-grid system level needs the system and the power converter to establish communication, and according to the state of the direct current micro-grid, the upper computer judges whether the direct current micro-grid needs protection or not and whether the power converter needs protection in a matching mode. Because the power converter has different control functions, the manufacturers of the power converter are different, and further, the communication protocols adopted by different manufacturers are different. The system protection of the direct-current micro-grid in the traditional technology is too high in dependence on a power converter, if the types of the power converters in the direct-current micro-grid are many and manufacturers for producing the power converters are also many, the upper computer and the power converter can be caused to be communicated too much, the progress of building the whole system is slow, the communication protocol is inconvenient to communicate, and the processing program of the upper computer is complicated.
In view of the above technical problems, the present application provides a dc microgrid protection device, which can communicate with a manufacturer, a ripple detection unit is arranged in a power converter for detecting ripples of output current of the power converter, and when a control system is required to be shut down, a filter circuit at an output end of the power converter is controlled by a control circuit to reduce the filtering capability of the filter circuit, and the ripple detection unit automatically shuts down when detecting that the ripple current at the output end of the power converter is large, so that system protection of a dc microgrid is standardized, dependence of the system protection on communication protocols and the like of the power converter is greatly reduced, and a control program of an upper computer can be simplified.
Referring to fig. 1, an embodiment of the present application provides a dc microgrid protection device for use in a dc microgrid system. The direct current micro-grid is a small power generation and distribution system which is composed of a distributed power supply, an energy storage device, an energy conversion device, a load, a monitoring and protecting device and the like. Compared with an alternating-current micro-grid, the direct-current micro-grid has a unique direct-current transmission line, and the control of a distributed power supply in the direct-current micro-grid only depends on the voltage of a direct-current bus, so that the control difficulty and the loss of a system are reduced.
Specifically, the dc microgrid protection device includes a power converter 100, a control circuit 200, and a filter circuit 300.
The power converter 100 is connected to the distributed power source and is configured to convert a voltage provided by the distributed power source into a uniform dc bus voltage. The distributed power supply can be a wind power generation power supply, a biomass battery, a super capacitor battery or a photovoltaic array battery and the like. Each load converter is connected with a direct current bus and converts the voltage of the direct current bus into the working voltage required by the electric equipment, so that the direct current micro-grid supplies power to the electric equipment on the load side.
The filter circuit 300 is connected to an output terminal of the power converter 100, and is configured to filter a current output by the power converter 100 and transmit a filtered current signal to the dc bus. The control circuit 200 is connected to the filter circuit 200 and inputs a dc bias current to the filter circuit 300, so as to reduce the filtering capability of the filter circuit 300.
The power converter 100 further comprises a first processing unit 110, a ripple detection unit 120 and a switching unit 130.
The ripple detection unit 120 is connected to the filter circuit 300 through the output terminal of the power converter 100, and is configured to detect a current ripple at the output terminal of the power converter 100. The first processing unit 110 is connected to the ripple detecting unit 120, and configured to receive the current ripple detected by the ripple detecting unit 120 and determine whether a shutdown is required according to the current ripple. The switching unit 130 is connected to an external device, and when the switching unit 130 is turned on, the power converter 100 is connected to the direct current microgrid, and when the switching unit 130 is turned off, the power converter 100 is disconnected from the direct current microgrid. The switch unit 130 is connected to the first processor 110, and when the first processing unit 110 determines that the ripple of the output circuit of the power converter 100 is large and needs to be actively shut down, the first processing unit 110 controls the switch unit 130 to be disconnected, so that the power converter 100 is disconnected from the dc microgrid, and the power converter 100 is automatically shut down. Specifically, the switching unit 130 in this embodiment may be a switching transistor, a thyristor device, or the like. When the first processing unit 110 inputs the pulse signal to the switching unit 130, the switching unit 130 is turned on. When the first processing unit 110 determines that shutdown is required, the input of the pulse to the switching unit 130 is stopped, that is, the blocking pulse is blocked, so that the switching unit 130 is turned off, and the power converter 100 is automatically shutdown.
When the dc microgrid system needs to be protected, the control circuit 200 inputs a dc bias current to the filter circuit 300, so that the working current of the filter circuit 300 exceeds the rated current thereof, the filtering performance of the filter circuit 300 is reduced, and the output current ripple at the output end of the power converter 100 is increased. The ripple detecting unit 120 detects a current ripple at an output terminal and transmits the current ripple to the first processing unit 110. The first processing unit 110 detects the ripple magnitude of the output current and controls the switching unit 130 to be turned off when the output current ripple is large to control the power converter 100 to be actively shut down.
The dc microgrid protection apparatus provided in the above embodiment is configured to detect ripples of output current of the power converter 100 by arranging the ripple detection unit 120 in the power converter 100, and control the filter circuit 300 at the output terminal of the power converter 100 by using the control circuit 200 to reduce the filtering capability when the dc microgrid needs to be protected, and when the ripple detection unit 110 detects that the ripple current at the output terminal of the power converter 100 is large, the first processing unit 120 controls the switch unit 130 to be switched off to control the power converter to autonomously stop, so that the system protection of the dc microgrid is standardized, dependence of the system protection on the control function and the communication protocol of the power converter 100 itself is greatly reduced, and the control program of the upper computer can also be simplified.
In one embodiment, as shown in fig. 2, the power converter 100 further includes a storage unit 140, and the storage unit 140 stores a preset current ripple interval. After receiving the current ripple collected by the ripple detection unit 120, the first processing unit 110 compares the collected current ripple with a preset current ripple interval, and when the collected current ripple is within the preset current ripple interval, it indicates that the autonomous shutdown is not required, and then the first processing unit 110 continuously inputs a pulse signal to the switching unit 130. When the first processing unit 110 detects that the collected current ripple is outside the preset current ripple interval, which indicates that the dc microgrid system needs to be protected, the first processing unit 110 stops inputting the pulse signal to the switching unit 130, so that the switching unit 130 is turned off, and the autonomous shutdown of the power converter 100 is further realized.
In one embodiment, as shown in fig. 3, the filter circuit 300 includes a filter inductor L1, one end of the filter inductor L1 is connected to the output terminal of the power converter 100, and the other end is connected to the dc bus. When the operating current of the inductive filter exceeds the rated current, the filter is overheated, and the low-frequency filtering performance of the filter is reduced. The present application utilizes this phenomenon to control the filtering performance of the filter, so that the filtering performance is reduced, thereby increasing the current ripple at the output end of the power converter 100.
Further, the filter circuit 300 further includes a mutual inductance L2 for generating mutual inductance with the filter inductance L1, the filter inductance L1 and the mutual inductance L2 form a pair of mutual inductance groups, and the filter inductance L1 and the mutual inductance L2 are wound on the same magnetic core. The two ends of the mutual inductance inductor L2 are connected with the control circuit 200, and the control circuit passes through direct current bias current into the mutual inductance inductor L2 to change the magnetic flux in the magnetic core, so that the magnetic core is saturated, the inductance of the filter inductor L5 is further reduced, and the filtering capacity of the filter inductor L5 is reduced. Since the filter inductor L5 is used to filter the ripple of the output current of the power converter 100, the ripple of the output current of the power converter 100 will increase after the inductance of the filter inductor L5 decreases, so that the first processing unit 110 controls the power converter 100 to stop automatically according to the current ripple at the output terminal.
In one embodiment, as shown in fig. 4, the control circuit 200 includes a second processing unit 210 and a current source 220. The current source 220 is connected to both ends of the mutual inductor L2, and is used for inputting a dc bias current to the mutual inductor L2. The second processing unit 210 is connected to the current source 220, and is configured to control the magnitude of the dc bias current input from the current source to the mutual inductor L2. When the direct-current microgrid operates normally, the second processing unit 210 controls the current source 210 to input a small current into the mutual inductance L2, or stops inputting a current into the mutual inductance L2, so that the filter inductance L1 operates normally, and current harmonics in the circuit are suppressed. When the direct-current microgrid system needs to be protected, the second processing unit 210 controls the current source 220 to input a large current into the mutual inductance inductor L2, so that the magnetic core is saturated, and the inductance of the filter inductor L1 is reduced. In this application, the first processing unit 110 and the second processing unit 210 may be both microprocessors.
Further, the dc microgrid protection device further includes an upper computer, the upper computer is connected to the control circuit 200, and is configured to communicate with the second processing unit 210 in the control circuit 200, and issue a protection instruction to the second processing unit 210 when it is detected that the dc microgrid system needs to be protected, so that the second processing unit 210 controls the current source 220 to input the dc bias current into the mutual inductance inductor L2. It is understood that the second processing unit 210 is provided therein with a communication unit for communicating with the upper computer. It should be noted that, the method for generating the control command by the upper computer according to the detected state of the dc microgrid system may be implemented by a known technology, which is not an improvement point of the present application.
In one embodiment, the dc microgrid protection apparatus further comprises a distributed power source connected to an input of the power converter 100, and the power converter 100 can convert a voltage of the distributed power source into a dc voltage suitable for transmission on a dc bus. Specifically, the switching unit 130 in the power converter 100 is connected to the distributed power source, and when the system needs to be protected, the power converter 100 controls the switching unit 130 to be disconnected, so that the power converter 100 is disconnected from the distributed power source. In this embodiment, the power converter 100 may include a dc power converter or an ac power converter, and when the voltage provided by the distributed power source is a dc voltage, the power converter 100 connected to the distributed power source is a dc power converter; when the voltage supplied from the distributed power supply is an ac voltage, the power converter 100 connected to the distributed power supply is an ac power converter.
A specific application scenario of the present application is provided below:
as shown in fig. 4, the dc microgrid protection apparatus includes a power converter 100, a control circuit 200, and a filter circuit 300. The control circuit 200 includes a second processing unit 210 and a current source 220 connected to the second processing unit 210. The filter circuit 300 comprises a filter inductor L1 and a mutual inductor L2, the filter inductor L1 and the mutual inductor L2 are wound on the same magnetic core, two ends of the mutual inductor L2 are connected with the current source 220, one end of the filter inductor L1 is connected with the output end of the power converter 100, and the other end of the filter inductor L1 is connected with the direct-current bus. The power converter 100 includes a first processing unit 110, a ripple detecting unit 120, a switching unit 130, and a storage unit 140. One end of the ripple detection unit 120 is connected to one end of the filter inductor L1 through an output terminal, and the other end is connected to the first processing unit 110. The first processing unit 110 is also connected to an external device, such as a distributed power supply, through the switching unit 130. The storage unit 140 is connected to the first processing unit 110, and is configured to store a preset current ripple interval.
The second processing unit 210 can communicate with an upper computer, when the upper computer detects that the direct-current microgrid system needs to be protected, a protection instruction is issued to the second processing unit 210, and the second processing unit 210 controls the current source 220 to input direct-current bias current like the mutual inductance inductor L2 according to the received protection instruction, so that the magnetic core is saturated, and the inductance of the filter inductor L1 is reduced. As the inductance of the filter inductor L1 decreases, the filtering capability of the filter inductor L1 also decreases, and the output current ripple of the power converter 100 becomes larger.
The ripple detection unit 110 is configured to detect a ripple of an output current of the power converter 100 and transmit the detected ripple to the first processing unit 110. The first processing unit 110 compares the detected current ripple with a preset current ripple interval, and when the detected current ripple is outside the preset current ripple interval, stops inputting the pulse signal to the switching unit 130, so that the switching unit 130 is turned off, the power converter 100 is disconnected from the external device, and the power converter 100 is automatically stopped.
The dc microgrid protection apparatus provided in the above embodiment is configured to detect ripples of output current of the power converter 100 by arranging the ripple detection unit 120 in the power converter 100, and control the filter circuit 300 at the output terminal of the power converter 100 by using the control circuit 200 to reduce the filtering capability when the dc microgrid needs to be protected, and the first processing unit 120 controls the power converter to automatically stop when the ripple detection unit 110 detects that the ripple current at the output terminal of the power converter 100 is large, so that system protection of the dc microgrid is standardized, dependence of the system protection on the control function and communication protocol of the power converter 100 itself is greatly reduced, and a control program of an upper computer can also be simplified.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011009351.0A CN112260237A (en) | 2020-09-23 | 2020-09-23 | DC Microgrid Protection Device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011009351.0A CN112260237A (en) | 2020-09-23 | 2020-09-23 | DC Microgrid Protection Device |
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| CN112260237A true CN112260237A (en) | 2021-01-22 |
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| CN202011009351.0A Pending CN112260237A (en) | 2020-09-23 | 2020-09-23 | DC Microgrid Protection Device |
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Citations (4)
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|---|---|---|---|---|
| US4873602A (en) * | 1987-11-12 | 1989-10-10 | General Electric Company | Ripple attenuator for AC power transmission line protective relays |
| CN1885698A (en) * | 2005-06-24 | 2006-12-27 | 三洋电机株式会社 | Switching control circuit and self-excited dc-dc converter |
| US20200256926A1 (en) * | 2019-02-12 | 2020-08-13 | Fuji Electric Co., Ltd. | Abnormality cause identifying method, abnormality cause identifying device, power converter and power conversion system |
| CN111654057A (en) * | 2020-05-18 | 2020-09-11 | 深圳供电局有限公司 | Anti-islanding protection device and system |
-
2020
- 2020-09-23 CN CN202011009351.0A patent/CN112260237A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4873602A (en) * | 1987-11-12 | 1989-10-10 | General Electric Company | Ripple attenuator for AC power transmission line protective relays |
| CN1885698A (en) * | 2005-06-24 | 2006-12-27 | 三洋电机株式会社 | Switching control circuit and self-excited dc-dc converter |
| US20200256926A1 (en) * | 2019-02-12 | 2020-08-13 | Fuji Electric Co., Ltd. | Abnormality cause identifying method, abnormality cause identifying device, power converter and power conversion system |
| CN111654057A (en) * | 2020-05-18 | 2020-09-11 | 深圳供电局有限公司 | Anti-islanding protection device and system |
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