CN112582992B - Direct-current micro-grid branch linkage control system and method - Google Patents
Direct-current micro-grid branch linkage control system and method Download PDFInfo
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- CN112582992B CN112582992B CN201910930907.0A CN201910930907A CN112582992B CN 112582992 B CN112582992 B CN 112582992B CN 201910930907 A CN201910930907 A CN 201910930907A CN 112582992 B CN112582992 B CN 112582992B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
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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
-
- 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
- H02H7/263—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 measured values
Abstract
The invention provides a direct-current micro-grid branch linkage control system and a direct-current micro-grid branch linkage control method. Direct current microgrid branch road coordinated control system includes: the detection unit is used for carrying out real-time voltage detection and current detection on each branch circuit connected to the direct-current micro-grid bus; the controller is used for carrying out frequency analysis and threshold analysis on the detected voltage and current, judging faults occurring in the direct-current microgrid based on the frequency analysis and the threshold analysis, and carrying out linkage control on a plurality of branches based on the faults; and the branch linkage mechanism is used for performing linkage protection on branches in the system under the control of the controller.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a direct-current micro-grid branch linkage protection control system and method.
Background
With the increase of photovoltaic power generation projects, the large number of applications of electric vehicle charging stations and the large number of applications of lithium battery backup power stations, the applications of direct current systems and direct current micro-grids are more and more, however, direct current protection is fast in requirement speed relative to alternating current protection, protection is reliable, and the realization difficulty of direct current protection is large. The direct current micro-grid is just rising in recent years, and the protection theory and the protection method are not as perfect as the alternating current protection system.
In recent years, a direct-current micro-grid has just emerged, so that the control theory, the specific implementation mode and the equipment have more defects. For example, in the direct current protection method, voltage and current threshold protection methods are mostly adopted in the prior art, so that different working conditions cannot be accurately distinguished, and false operation is easy to occur; in addition, the current and voltage slope method is also used in the prior art, which improves the situation and reduces the misjudgment situation compared with the threshold value method, but the misjudgment is easy to occur even in some high-speed load changes. In addition, the methods only deal with specific fault conditions, and do not consider linkage control of the whole microgrid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel fault judgment method, an implementation mode and a specific control system. A method for judging faults based on frequency characteristics is provided for the characteristics of direct-current microgrid application, a control strategy for simultaneous linkage of multiple branches in a direct-current microgrid is provided for the characteristics of direct-current microgrid application, and a specific control system is provided based on the control strategy.
A direct current microgrid branch linkage control system comprises: the detection unit is used for carrying out real-time voltage detection and current detection on each branch circuit connected to the direct-current micro-grid bus; the controller is used for carrying out frequency analysis and threshold analysis on the detected voltage and current, judging faults occurring in the direct-current microgrid based on the frequency analysis and the threshold analysis, and carrying out linkage control on a plurality of branches based on the faults; and the branch linkage mechanism is used for performing linkage protection on branches in the system under the control of the controller.
The frequency analysis performed by the controller may obtain the dc component and the high frequency component by performing a real-time fast fourier transform analysis on the voltage signal and the current signal of each branch collected in real time.
The frequency analysis performed by the controller may pre-determine the high frequency component and then determine the dc component.
A fault may be confirmed when the frequency analysis performed by the controller determines that the high frequency component has a sudden change and the threshold analysis performed by the controller determines that the magnitude of the dc component exceeds a predetermined threshold.
The controller can control the branch circuit linkage mechanism to remove the fault branch circuit and adjust the load distribution and the bus voltage of the rest branch circuits according to the current running condition of each branch circuit.
A direct-current microgrid branch linkage control method comprises the following steps: performing real-time voltage detection and current detection on each branch connected to the direct-current microgrid bus; performing a frequency analysis and a threshold analysis on the detected voltage and current; judging faults occurring in the direct-current microgrid based on the frequency analysis and the threshold analysis; and when the fault occurs, executing linkage protection on the branch in the system.
In the method, the frequency analysis may be performed by performing real-time fast fourier transform analysis on the voltage and current signals of each branch collected in real time to obtain a direct current component and a high frequency component.
In the method, the frequency analysis may pre-determine the high frequency component and then determine the dc component.
In the method, the occurrence of a fault is confirmed when it is determined by the frequency analysis that the high-frequency component has a sudden change and it is determined by the threshold analysis that the magnitude of the direct-current component exceeds a predetermined threshold.
According to the method, the fault branch can be cut off and the load distribution and the bus voltage of the rest branches can be adjusted according to the current running condition of each branch.
The direct-current micro-grid branch linkage protection control system provided by the invention can provide the following advantages: the novel direct current fault detection method is used in cooperation with other protection methods, and fault judgment can be realized more quickly and accurately; the linkage direct-current micro-grid branch control structure is applied to a direct-current micro-grid, so that the direct-current micro-grid control is more efficient and reliable.
Drawings
Fig. 1 is a diagram of a dc microgrid branch-circuit linkage protection control system according to the present invention;
FIG. 2 is a schematic diagram of a three branch small capacity microgrid according to the present invention;
FIG. 3 is a voltage and current waveform diagram of a three branch small capacity microgrid according to the present invention;
FIG. 4 is an enlarged view at time T1 of a voltage and current waveform plot for a three-branch small capacity microgrid according to the present invention;
FIGS. 5A and 5B are a hardware block diagram and a software flow diagram, respectively, of a frequency measurement method according to the present invention;
fig. 6 is a control flow chart of the dc microgrid branch linkage protection control system according to the present invention;
fig. 7 is a flowchart of a dc microgrid branch linkage protection control method according to the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, specific embodiments thereof will be described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides a novel direct current fault detection method, a control method and a corresponding control system based on the actual application condition of a direct current microgrid.
The embodiment of the invention has the advantages that the method of frequency measurement and threshold value method is adopted for a single fault point, so that the fault discrimination speed and the preparation rate are increased, and meanwhile, the central control system is utilized to carry out multi-branch intelligent control on the micro-grid, so that the aim of maintaining the stability of the system is fulfilled.
The direct-current micro-grid branch linkage protection control system provided by the embodiment of the invention is provided with a branch linkage protection control system on the basis of a direct-current micro-grid architecture.
Fig. 1 is a diagram of a dc microgrid branch linkage protection control system according to the present invention. As shown in fig. 1, the dc microgrid includes a dc bus and a plurality of dc branches connected to the dc bus. The direct current branch comprises a DC/DC converter, one end of the DC/DC converter is connected with a direct current bus, and the other end of the DC/DC converter is respectively connected with a distributed direct current power supply or an energy storage system. For example, the distributed dc power source may be a photovoltaic cell, and the energy storage system is a lithium battery, a lead carbon battery, or a super capacitor. The DC/DC converter can also be connected with an electric automobile charging system. In addition, the direct current branch also comprises a load connected to the direct current bus. The direct current bus is connected to an alternating current power grid through an AC/DC converter and an AC transformer.
The branch linkage protection control system includes a detection unit 100, a controller (e.g., an intelligent control device) 200, and a branch linkage 300.
The dc bus in the dc microgrid is connected to the distributed dc power supply, the energy storage system, or the load through the branch linkage 300 and the detection unit 100.
The detection unit 100 performs real-time voltage and current detection on each branch connected to the dc microgrid bus. The detection unit 100 may be implemented in various forms including, but not limited to, a sensor, a transformer, and the like.
The branch linkage 300 is an actuator of the branch linkage protection system, and performs linkage protection on branches in the system by the control of the intelligent control device 200. The branch linkage 300 may be implemented in a variety of ways including, but not limited to, a circuit breaker with communication capability, a solid state protection switch with communication capability, and the like.
The intelligent control device 200 is a core component of the branch linkage protection control system. The intelligent control device 200 is in communication connection with the detection unit 100 and the branch circuit linkage mechanism 300 respectively, and the detection unit 100 collects voltage and current in the direct current branch circuit in real time to control a circuit breaker or a protection switch in the branch circuit linkage mechanism 300 to be switched on or switched off. The intelligent control device 200 rapidly identifies the fault according to a preset linkage control strategy and a protection algorithm, classifies and hierarchically processes the fault type of each branch by using the algorithm, and then sends fault information in real time through the communication module to perform linkage control among a plurality of branches. The intelligent control device 200 may be implemented in various ways including, but not limited to, an industrial computer, an industrial personal computer, and the like.
Fault judgment by frequency measurement
The dc faults are mostly classified into dc short-circuit faults, inter-electrode arcing faults, overvoltage faults, and the like. The overvoltage type fault can be effectively detected and protected by using a common threshold method, and relevant description is omitted. It is more difficult to detect a dc short circuit fault and an interpolar arcing fault. The invention provides a frequency measurement method (frequency analysis) for fault judgment aiming at the two faults.
The frequency measurement method is described below by taking three branches as an example. Fig. 2 is a schematic diagram of a three-branch small capacity microgrid according to the present invention.
The principle of the frequency-measurement-method fault determination will be described with reference to fig. 2, and in fig. 2, a three-branch small-capacity microgrid schematic diagram shows only a small-capacity microgrid structure in which 3 branches exist, however, embodiments of the present invention are not limited thereto, and may be applied to a system having more than 3 branches. The bus voltage of the dc microgrid shown in fig. 2 is 800V, and the branch impedance is equivalent to a resistance with an inductor. In the branch 2, a normal load and a short-circuit fault are connected to indicate that a normal load is put into operation and a short-circuit fault occurs, respectively.
And simultaneously monitoring the bus voltage and the branch current, and performing Fast Fourier Transform (FFT) analysis on the monitored bus voltage Etest and the monitored branch current Itest, namely performing frequency analysis on a measured signal to obtain 4 components such as Umeg, Udc, Imeg and Idc for judging faults. Specific waveform data is shown in fig. 3.
Fig. 3 is a voltage and current waveform diagram of a three-branch small capacity microgrid according to the present invention.
In fig. 3, when a normal load is switched on at time T0 (i.e. around 0.2 s), the voltage and the current fluctuate, and it can be seen at a in fig. 3 that the voltage and the current fluctuate when the load is switched on, but the voltage fluctuation amplitude is small and the current rise rate is small. When a branch short-circuit fault occurs at time T1 (i.e., around 0.4S), it can be seen at B in fig. 3 that a large change occurs in both current and voltage, and when a branch is short-circuited, the voltage drops greatly and the current rising slope is large. In fig. 3, the voltage waveform Udc indicates the variation of the bus voltage; the current waveform Idc indicates the current variation of the branch 2; umeg is the voltage spectrum change condition of the voltage waveform Udc after FFT frequency analysis; imeg is the current spectrum variation of the current waveform Idc of the branch 2 after being subjected to the FFT frequency analysis.
Fig. 4 is an enlarged view of the time T1 of the voltage and current waveform diagram of the three-branch small capacity microgrid according to the present invention. Referring to fig. 3 and 4, it can be seen that when a load is put in, the voltage and current of the branch in which the load is placed change and the corresponding Umeg and Imeg change synchronously. In addition, when a normal load is put into the T0, the change amplitude of the branch current and voltage is small, and Umeg and Imeg change is also small; and when the short-circuit fault occurs at T1, the change amplitude of the branch circuit current and voltage is large, the voltage drop rate and the current rise rate are large (compared with normal load input), and Umeg and Imeg also change greatly.
According to the characteristics, the fault judgment of the DC branch can be effectively carried out.
The specific embodiment of the invention is used for explaining a frequency measurement method for monitoring the DC short-circuit fault, however, the method can be applied to not only the DC micro-grid, but also fault monitoring of other DC circuits.
There are various judgment methods for the direct current fault, including: a threshold method, in which a protection threshold of voltage or current is preset, and when the voltage or current reaches or exceeds the preset threshold, it is determined that a fault occurs; the slope method is used for judging the change rate of the voltage or the current, and when the change rate of the voltage or the current has larger change, the fault is judged to occur; the frequency measurement method is used for carrying out frequency spectrum analysis on the voltage or current monitored in real time, and judging faults by utilizing different frequency spectrum characteristics according to the difference between the frequency spectrum when a normal load works and the frequency spectrum when the faults occur. In the frequency measurement method, when a fault occurs, high-frequency components of voltage and current are changed greatly, so that the fault is identified and effective protection can be performed. The fault identification method adopted by the invention is based on a frequency measurement method and is combined with a threshold value method to monitor and analyze the faults occurring in the system.
Fig. 5A and 5B are a hardware configuration diagram and a software flowchart of the frequency measurement method according to the present invention, respectively.
The branch circuit acquires voltage and current in real time and carries out real-time FFT analysis to obtain a direct-current component and a high-frequency component. The FFT analysis may be implemented by a hardware circuit, or may be implemented by software. Through FFT analysis, fault judgment is carried out based on the size of the direct current component and the size of the high-frequency component. As can be seen from the software flowchart of fig. 5B, the judgment of the fault by the frequency measurement method is to judge the high-frequency component in advance, and then judge the dc component. This is because, as shown in fig. 4, a short-circuit fault occurs at time T1, high frequency components begin to appear at time T2 (see Umeg and Imeg curves), during which the current magnitude gradually increases, and then reaches a protection reference threshold for the branch current magnitude (see IDC plot) or for the dc bus voltage magnitude at time T3. Therefore, when a short-circuit fault occurs, the high-frequency component can appear in advance, and the fault can be pre-judged in advance by using the characteristic so as to shorten the time required by fault judgment; and secondly, carrying out secondary confirmation on the amplitude of the direct current component by utilizing threshold analysis, so that the fault judgment is more accurate and the misjudgment is prevented.
Direct-current microgrid branch linkage control strategy
Fig. 6 is a control flow chart of the direct current microgrid branch linkage protection control system according to the present invention.
Referring to fig. 1 and 6, the detection unit 100 is disposed in each dc branch of the dc microgrid to detect voltage and current of each branch in real time, the voltage and current signals detected by the detection unit 100 during monitoring may include a fault abnormality signal, and the detected voltage and current signals including the fault abnormality signal are transmitted to the smart control device 200 by means of communication. The intelligent control device 200 may analyze whether a branch has failed using intelligent algorithms including, but not limited to, frequency measurement methods in which the aforementioned FFT analysis and then threshold analysis are performed on the voltage and current signals. And determining branch faults by judging the characteristics of the direct current component and the high frequency component obtained by FFT analysis. Since the high frequency component usually appears in advance when a fault occurs in the branch, the fault can be judged in advance by detecting the change of the high frequency component obtained by FFT analysis, and then the fault of the branch can be determined by judging whether the direct current component exceeds a threshold value, so that the occurrence of misjudgment can be prevented. The fault is determined by combining frequency analysis and threshold analysis, the intelligent control device 200 performs comprehensive control according to the current operating condition of each branch, cuts off the faulty branch by using the branch linkage mechanism 300, simultaneously adjusts the load distribution of other circuits (for example, reduces the loads of other branches), and adjusts the voltage of the direct current bus (for example, increases the voltage adjustment parameter in the power supply branch), so as to ensure the stable and normal operation of the direct current bus and avoid the enlargement of the fault. According to the intelligent branch linkage protection control system for the direct-current micro-grid, the judgment of faults and the protection of a micro-grid system are realized, so that the stable operation of the voltage and the current of a direct-current bus is realized.
Fig. 7 is a flowchart of a dc microgrid branch linkage protection control method according to the present invention.
Referring to fig. 7, in step 710, the dc microgrid branch linkage control method performs real-time voltage detection and current detection on each branch connected to the dc microgrid bus, and the detected voltage and current signals during the monitoring may include an abnormal signal, and the detected voltage and current signals are transmitted to the intelligent control apparatus 200 by means of communication.
At step 720, intelligent algorithms including, but not limited to, frequency measurement methods, in which the aforementioned FFT analysis is performed on the voltage and current signals, and then a threshold analysis is performed on the voltage amplitude of the dc bus or the branch current amplitude, may be used to analyze whether the branch has failed.
In step 730, since the high frequency component usually appears in advance when the branch circuit is in fault, the fault can be determined in advance by detecting the change of the high frequency component obtained by the FFT analysis, and then the branch circuit fault can be determined by determining whether the direct current component exceeds the threshold value, so that the occurrence of misdetermination can be prevented.
In step 740, comprehensive control is performed according to the current operating conditions of each branch, the branch linkage mechanism 300 is used to remove the faulty branch, simultaneously adjust the load distribution of other circuits, adjust the bus voltage to ensure that the bus works normally, and perform linkage protection on the branches in the dc microgrid to avoid the fault amplification.
The direct-current microgrid branch linkage protection control system and method provided by the invention can provide the following advantages: the novel direct current fault detection method is used in cooperation with other protection methods, and fault judgment can be realized more quickly and accurately; the linkage direct-current micro-grid branch control structure is applied to a direct-current micro-grid to enable the direct-current micro-grid to be controlled more efficiently and reliably.
There is also provided, in accordance with an exemplary embodiment of the present invention, a computer-readable storage medium storing a computer program. The computer-readable storage medium stores a computer program that, when executed by a processor, causes the processor to execute a control method of a dc brushless motor according to the present invention. The computer readable recording medium is any data storage device that can store data read by a computer system. Examples of the computer-readable recording medium include: read-only memory, random access memory, read-only optical disks, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the internet via wired or wireless transmission paths).
There is also provided, in accordance with an exemplary embodiment of the present invention, a computer apparatus. The computer device includes a processor and a memory. The memory is for storing a computer program. The computer program is executed by the processor, so that the processor executes the computer program of the direct current microgrid branch linkage control method.
Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (12)
1. The utility model provides a direct current microgrid branch road coordinated control system, direct current microgrid includes direct current bus and is connected to many direct current branch roads of direct current bus, its characterized in that includes:
the detection unit is used for carrying out real-time voltage detection and current detection on each branch circuit connected to the direct-current micro-grid bus;
the controller is used for carrying out frequency analysis and threshold analysis on the detected voltage and current, judging faults occurring in the direct-current microgrid based on the frequency analysis and the threshold analysis, and carrying out linkage control on a plurality of branches based on the faults, wherein the frequency analysis is firstly used for carrying out fault prejudgment, and then the threshold analysis is used for carrying out secondary confirmation; and
and the branch linkage mechanism is used for performing linkage protection on branches in the system under the control of the controller.
2. The DC microgrid branch linkage control system of claim 1,
the frequency analysis performed by the controller obtains a direct current component and a high frequency component by performing real-time fast fourier transform analysis on the voltage signal and the current signal of each branch collected in real time.
3. The dc microgrid branch linkage control system of claim 2, wherein the frequency analysis performed by the controller pre-determines the high frequency component and then determines the dc component.
4. The coordinated control system according to claim 2, wherein a fault is identified when the frequency analysis performed by the controller determines that the high frequency component has a sudden change and the threshold analysis performed by the controller determines that the amplitude of the dc component exceeds a predetermined threshold.
5. The direct current microgrid branch linkage control system according to claim 1, wherein the controller controls the branch linkage mechanism to remove a faulty branch and adjust load distribution and bus voltage of the remaining branches according to current operating conditions of each branch.
6. A direct current microgrid branch linkage control method is characterized by comprising the following steps of:
performing real-time voltage detection and current detection on each branch connected to the direct-current microgrid bus;
performing a frequency analysis and a threshold analysis on the detected voltage and current;
judging faults occurring in the direct-current microgrid based on the frequency analysis and the threshold analysis, wherein the frequency analysis is firstly used for carrying out fault prejudgment, and then the threshold analysis is used for carrying out secondary confirmation;
and when the fault occurs, executing linkage protection on the branch in the system.
7. The direct-current microgrid branch linkage control method according to claim 6,
the frequency analysis obtains a direct current component and a high frequency component by performing real-time fast Fourier transform analysis on the voltage and current signals of each branch acquired in real time.
8. The method according to claim 7, wherein the frequency analysis is used for pre-determining the high-frequency component and then determining the direct-current component.
9. The coordinated control method for the DC microgrid branch circuits according to claim 7, wherein a fault is confirmed when the high-frequency component is determined to have a sudden change through the frequency analysis and the amplitude of the DC component is determined to exceed a predetermined threshold through the threshold analysis.
10. The direct current microgrid branch linkage control method according to claim 6, characterized in that according to the current operation condition of each branch, a fault branch is removed and the load distribution and bus voltage of the rest branches are adjusted.
11. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the dc microgrid branch linkage control method according to any one of claims 6 to 10.
12. A computer device, characterized in that the computer device comprises:
a processor;
a memory storing a computer program which, when executed by the processor, implements the dc microgrid branch circuit linkage control method according to any one of claims 6 to 10.
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| CN201910930907.0A CN112582992B (en) | 2019-09-29 | 2019-09-29 | Direct-current micro-grid branch linkage control system and method |
| PCT/CN2019/128721 WO2021056896A1 (en) | 2019-09-29 | 2019-12-26 | Direct current microgrid branch linkage control system and method |
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| CN113640622B (en) * | 2021-08-31 | 2023-09-22 | 广东电网有限责任公司 | Fault detection method and system for medium-low voltage direct current micro-grid |
| CN113872164A (en) * | 2021-10-09 | 2021-12-31 | 深圳供电局有限公司 | Power distribution protection method, device, system and storage medium |
| CN114498578B (en) * | 2021-12-28 | 2024-03-22 | 深圳供电局有限公司 | DC power supply and distribution protection method and device, computer equipment and storage medium |
| US20230408601A1 (en) * | 2022-06-17 | 2023-12-21 | Honeywell Limited | Fault detection in a power distribution system providing high voltage direct current through multiple channels with a floating ground |
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| CN108054736A (en) * | 2017-11-27 | 2018-05-18 | 山东大学 | A kind of multiterminal flexible direct current power grid DC line protection method based on voltage pole ripple |
| CN108802570A (en) * | 2018-06-15 | 2018-11-13 | 贵州电网有限责任公司 | A kind of fault detection system and detection method for alternating current-direct current series-parallel connection micro-capacitance sensor |
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| WO2021056896A1 (en) | 2021-04-01 |
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