CN114725908B - Method for analyzing DC inrush current after single-end locking of DC power distribution network and related device - Google Patents
Method for analyzing DC inrush current after single-end locking of DC power distribution network and related device Download PDFInfo
- Publication number
- CN114725908B CN114725908B CN202210638188.7A CN202210638188A CN114725908B CN 114725908 B CN114725908 B CN 114725908B CN 202210638188 A CN202210638188 A CN 202210638188A CN 114725908 B CN114725908 B CN 114725908B
- Authority
- CN
- China
- Prior art keywords
- current
- sum
- initial
- currents
- distribution network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The application discloses a method for analyzing DC inrush current after single-end locking of a DC power distribution network and a related device, wherein the method comprises the following steps: s1, taking the lightning arrester branch in the direct current distribution network with the single-end locked as a resistor, and constructing an equivalent circuit containing an RLC loop; s2, calculating to obtain equivalent initial resistance according to the initial current of each RLC loop and the sum of each initial current, and calculating to obtain the current of each RLC loop and the time domain expression of the sum of each current according to the initial resistance and based on a differential equation system; s3, setting a time interval, calculating the current of each RLC loop and the sum of each current at the next moment through a time domain expression, and generating a current curve in the time interval; and S4, repeating the steps S2-S4 after the current is taken as the initial current and the sum of the currents is taken as the sum of the initial currents until the sum of the currents is equal to 0, and obtaining a current curve in each time interval. The technical problem of poor accuracy of inrush current calculation in the prior art is solved.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a direct current inrush current analysis method and a related device after single-end locking of a direct current power distribution network.
Background
Different from an alternating current power distribution network, the main equipment of the direct current power distribution network is a conversion device formed by a large number of power electronic devices, the current tolerance of the devices is lower than that of a transformer of a traditional alternating current power distribution network, the transient state path impedance is small, a large number of capacitors exist in the transient state path impedance, and the change development speed of direct current fault current and direct current power flow is far higher than that of the alternating current power distribution network, so that the direct current power distribution network is required to have fault protection action speed reaching hundred microseconds, the direct current power distribution network protection is mainly based on port equipment protection and is tightly matched with devices such as a direct current breaker and a current limiter, the direct current power distribution network protection system is a mature protection system which is practically verified in a high-voltage large-capacity flexible direct current power transmission system, and most fault over-current and over-voltage problems can be solved.
In a medium-low voltage direct current power distribution network, the number of ports is large, the capacity difference of the ports is large, and in a network comprising 3 or more converter stations, when one main converter station is temporarily locked due to a fault and no direct current side fault exists, other port protection actions in a direct current system should not be caused, but energy in the direct current power distribution network is forced to be rapidly redistributed, and the generated inrush current can trigger port direct current overcurrent protection with small capacity.
In the existing scheme, the inrush current calculation assumes that the blocking converter station is a current source which rapidly attenuates at a certain rate, the equivalent calculation result may only be applicable to the initial stage of the maximum current attenuation rate, and when the differentiation is carried out, when a source is added to the system to provide energy, the final result cannot reflect the actual blocking state of the system. When no test or simulation is carried out, the equivalent current source current decay rate is unknown, which is not beneficial to the application of engineering design and reconstruction.
Disclosure of Invention
The application provides a direct current inrush current analysis method and a related device after single-end locking of a direct current power distribution network, which are used for solving the technical problem of poor inrush current calculation accuracy in the prior art.
In view of this, a first aspect of the present application provides a method for analyzing dc inrush current after single-ended blocking of a dc power distribution network, where the method includes:
s1, taking the lightning arrester branch in the direct current distribution network with the single-end locked as a resistor, and constructing an equivalent circuit containing an RLC loop;
s2, calculating to obtain equivalent initial resistance according to the initial current of each RLC loop and the sum of the initial currents, and calculating to obtain a time domain expression of the current of each RLC loop and the sum of the currents according to the initial resistance and on the basis of a differential equation set;
s3, setting a time interval, calculating the current of each RLC loop and the sum of each current at the next moment through the time domain expression, and generating a current curve in the time interval;
s4, taking the current as the initial current and the sum of the currents as the sum of the initial currents, and then repeating the steps S2-S4 until the sum of the currents is equal to 0, so as to obtain a current curve in each time interval.
Optionally, step S1 specifically includes:
and taking the lightning arrester branch in the direct current distribution network with the single-end locked as a resistor, and enabling the converter station which is not locked to be equivalent to an RLC circuit containing a capacitor and an inductor to construct an equivalent circuit.
Optionally, step S2 specifically includes:
calculating to obtain equivalent initial resistance according to initial current of each RLC loop and sum of the initial current based on a lightning arrester volt-ampere characteristic curve, wherein the sum of the initial current is current flowing into a locked converter station from each unlocked converter station;
and substituting the initial resistance into a differential equation set of the equivalent circuit to calculate to obtain the time domain expression of the current of each RLC loop and the sum of each current.
Optionally, the setting the time interval specifically includes: and setting the size of the time interval according to the precision requirement of the direct current inrush current analysis.
This application second aspect provides a direct current distribution network single-ended blocking back direct current inrush current analytic system, the system includes:
the building module is used for taking the lightning arrester branch in the direct-current power distribution network after the single-end locking as a resistor and building an equivalent circuit containing an RLC loop;
the first calculation module is used for calculating to obtain equivalent initial resistance according to the initial current of each RLC loop and the sum of the initial currents, and calculating to obtain a time domain expression of the current of each RLC loop and the sum of the currents according to the initial resistance and on the basis of a differential equation set;
the second calculation module is used for setting a time interval, calculating the current of each RLC loop and the sum of each current at the next moment through the time domain expression and generating a current curve in the time interval;
and the analysis module is used for triggering the first calculation module after the current is used as the initial current and the sum of the currents is used as the sum of the initial currents until the sum of the currents is equal to 0, so as to obtain a current curve in each time interval.
Optionally, the building module is specifically configured to:
and (3) taking the lightning arrester branch in the direct-current power distribution network with the single-end locked as a resistor, and enabling the converter station which is not locked to be equivalent to an RLC (radio link control) loop containing a capacitor and an inductor to construct an equivalent circuit.
Optionally, the first calculating module is specifically configured to:
calculating to obtain equivalent initial resistance according to initial current of each RLC loop and sum of the initial current based on a lightning arrester volt-ampere characteristic curve, wherein the sum of the initial current is current flowing into a locked converter station from each unlocked converter station;
and substituting the initial resistance into a differential equation set of the equivalent circuit to calculate to obtain a time domain expression of the current of each RLC loop and the sum of the currents.
Optionally, the second calculating module is specifically configured to:
setting the size of a time interval according to the precision requirement of the direct current inrush current analysis;
and calculating the current of each RLC loop and the sum of the currents at the next moment through the time domain expression, and generating a current curve in a time interval.
The third aspect of the present application provides a dc inrush current analysis device after single-ended blocking of a dc power distribution network, where the device includes a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the steps of the dc inrush current analysis method after single-ended blocking of the dc distribution network according to the instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for performing the method of the first aspect.
According to the technical scheme, the method has the following advantages:
the application provides a direct current inrush current analysis method after single-end locking of a direct current power distribution network, which comprises the following steps: s1, taking the lightning arrester branch in the direct current distribution network with the single-end locked as a resistor, and constructing an equivalent circuit containing an RLC loop; s2, calculating to obtain equivalent initial resistance according to the initial current of each RLC loop and the sum of the initial currents, and calculating to obtain the time domain expression of the current of each RLC loop and the sum of the currents according to the initial resistance and on the basis of a differential equation set; s3, setting a time interval, calculating the current of each RLC loop and the sum of each current at the next moment through a time domain expression, and generating a current curve in the time interval; and S4, repeating the steps S2-S4 after the current is taken as the initial current and the sum of the currents is taken as the sum of the initial currents until the sum of the currents is equal to 0, and obtaining a current curve in each time interval. Compared with the prior art, the method has the advantages that the key effect of the lightning arrester branch circuit in calculation of the blocking inrush current of the multi-port direct-current power distribution network is pointed out, an accurate and simple direct-current inrush current calculation method considering the volt-ampere characteristic curve of the lightning arrester is provided, and the technical problem that the inrush current calculation accuracy is poor in the prior art is solved.
Drawings
Fig. 1 is a schematic flowchart of an embodiment of a dc inrush current analysis method after single-ended blocking of a dc power distribution network according to an embodiment of the present application;
fig. 2 is a schematic diagram of a current path and an equivalent circuit of a multiport dc power distribution network after single-ended blocking according to an embodiment of the present application;
fig. 3 is a schematic view of a current-voltage characteristic curve of the lightning arrester provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of an embodiment of a dc inrush current analysis system after single-ended blocking of a dc power distribution network provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, in an embodiment of the present application, a method for analyzing dc inrush current after single-ended blocking of a dc power distribution network includes:
it should be noted that, in this embodiment, the four-port dc distribution network is taken as an example to describe the analysis and construction process of the equivalent circuit, which is specifically as follows:
as shown in fig. 2, assuming that the converter stations 2, 3, 4 output power to the converter station 1 via the dc lines in a normal state, when the converter station 1 is due to an ac side fault orWhen the self fault is temporarily locked, considering that the turn-off time of an IGBT tube is usually several microseconds to dozens of microseconds, the three bridge arms of the converter station 1 can be considered to complete locking instantly, if current still exists, the current can only be used for positively charging the module capacitor through the diode VD1 of each submodule, so that the number of capacitors connected in series is 2N when redundant modules are not considered, and the voltage of the locking bridge arms is 2u dc It follows that the residual dc system may inject current to the converter valve again, which may decay to zero in a few microseconds to a few tens of microseconds. When stray capacitance, ground-to-ground isolated impedance and an arrester are not considered, the inductor (bridge arm of each port converter station and line inductor) in the main loop of the multi-port direct-current power distribution network can induce a large voltage, but the situation is not allowed to occur in actual engineering, so that a proper arrester is designed at a key node to prevent overvoltage or provide a discharge path of various transient currents. Compared with the ground isolated impedance and the system stray capacitance, the conducting voltage corresponding to the voltage-current characteristic of the lightning arrester requires the lowest value, so that the lightning arrester is considered in an equivalent circuit in the locking process. For the 4-port ac/dc hybrid power distribution network shown in fig. 2, within 1ms (which is smaller than the time constant of the controller), the dc-side equivalent circuit after the converter station 1 is locked is also shown in fig. 2, and 3 unblocked ports are equivalent to series connection of an inductor and a capacitor, and can be substituted into a specific sub-module capacitor and a bridge arm inductance value; the blocking port is equivalent to instantaneous disconnection due to 2 times of system rated voltage and the existence of a diode, and the original input current of the blocking port isi dc,1 The discharge is completed through the lightning arrester, and the theoretical calculation can be carried out according to the equivalent circuiti dc,1 、i dc,2 、i dc,3 、i dc,4 Specific values of (a).
According to the analysis, if the lightning arrester branch circuit is regarded as a resistor, the equivalent circuit of the multi-port direct current power distribution network is an RLC circuit comprising three groups of capacitors and inductors, the initial state is the current of each port before locking, and the branch circuit voltage is the rated direct current voltage of the system.
However, the current-voltage characteristic of the arrester is shown in fig. 3, and it can be seen that the current-voltage characteristic corresponds to a varying resistance, and the column-written differential equation cannot be directly solved. Since the voltage is a rated voltage, it can be estimated by segmenting the voltage-current characteristic curve into equivalent resistances, which is described in the following step 102-104.
102, calculating to obtain equivalent initial resistance according to the initial current of each RLC loop and the sum of the initial currents, and calculating to obtain the time domain expression of the current of each RLC loop and the sum of the currents according to the initial resistance and on the basis of a differential equation set;
it should be noted that, as shown in fig. 3, the initial current of each RLC loop and the sum of each initial current are specifically substituted into the volt-ampere characteristic curve of the arrester to find a corresponding point on the curve, and the initial equivalent resistance can be obtained by connecting the initial point and the origin point; then substituting the initial resistance into a differential equation set of an equivalent circuit, and solving to obtaini dc,1 、i dc,2 、i dc,3 、i dc,4 Time domain expression 1.
103, setting a time interval, calculating the current of each RLC loop and the sum of each current at the next moment through a time domain expression, and generating a current curve in the time interval;
it is to be noted that the specific given time interval Δt(the accuracy of the estimated inrush current depends on how large the time interval Δ t is, the smaller the segmentation expression is, the more detailed the segmentation expression is); by time domain expressioni dc,1 、i dc,2 、i dc,3 、i dc,4 Value of the next time instant and depicts the time interval deltatInternal current curve.
And 104, repeating the step 102 and the step 104 after the current is used as the initial current and the sum of the currents is used as the sum of the initial currents until the sum of the currents is equal to 0, and obtaining a current curve in each time interval.
The time of the next time is obtainedi dc,1 、i dc,2 、i dc,3 、i dc,4 The lower value is replaced by the initial current of each RLC loop and the sum of the initial currents in step 102, and step 102 and step 104 are repeated to obtain expression 2 and the next time intervali dc,1 、i dc,2 、i dc,3 、i dc,4 The curve below and the value of the end of the moment are repeated untili dc,1 = 0。
Further, if the equivalent branch of the lightning arrester in the inrush current calculation after the lightning arrester is locked is considered, other methods can be adopted for specifically calculating the inrush current expression, for example, points on the volt-ampere characteristic curve are directly applied, and the lightning arrester branch is equivalent to other active circuits to be iteratively calculated in steps.
The foregoing is an embodiment of a method for analyzing dc inrush current after single-ended blocking of a dc distribution network provided in the embodiment of the present application, and the foregoing is an embodiment of a system for analyzing dc inrush current after single-ended blocking of a dc distribution network provided in the embodiment of the present application.
Referring to fig. 4, in an embodiment of the present application, a dc inrush current analysis system after single-ended blocking of a dc power distribution network includes:
the building module 201 is configured to use a lightning arrester branch in the dc power distribution network after the single-end locking as a resistor to build an equivalent circuit including an RLC loop;
the first calculating module 202 is configured to calculate an equivalent initial resistance according to the initial current of each RLC loop and a sum of each initial current, and calculate a time domain expression of the current of each RLC loop and the sum of each current according to the initial resistance and based on a differential equation set;
the second calculating module 203 is configured to set a time interval, calculate the current of each RLC loop and the sum of each current at the next time through a time domain expression, and generate a current curve in the time interval;
and the analysis module 204 is configured to trigger the first calculation module after the current is used as the initial current and the sum of the currents is used as the sum of the initial currents until the sum of the currents is equal to 0, so as to obtain a current curve in each time interval.
Further, the dc inrush current analysis device after single-ended blocking of the dc distribution network that still provides in this application embodiment includes processor and memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the method for analyzing the DC inrush current after single-ended blocking of the DC distribution network according to the instruction in the program code.
Further, in an embodiment of the present application, a computer-readable storage medium is further provided, where the computer-readable storage medium is used to store program codes, and the program codes are used to execute the method for analyzing dc inrush current after single-ended blocking of a dc power distribution network according to the above method embodiment.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present application.
Claims (6)
1. A method for analyzing DC inrush current after single-end locking of a DC power distribution network is characterized by comprising the following steps:
s1, taking the lightning arrester branch in the direct current power distribution network with the single-end locked as a resistor, and enabling the converter station which is not locked to be equivalent to an RLC circuit containing a capacitor and an inductor to construct an equivalent circuit;
s2, calculating to obtain equivalent initial resistance according to the initial current of each RLC loop and the sum of the initial currents based on a lightning arrester volt-ampere characteristic curve, wherein the sum of the initial currents is the current flowing into a locked converter station from each unlocked converter station; substituting the initial resistance into a differential equation set of the equivalent circuit to calculate to obtain a time domain expression of the current of each RLC loop and the sum of the currents;
s3, setting a time interval, calculating the current of each RLC loop and the sum of each current at the next moment through the time domain expression, and generating a current curve in the time interval;
s4, determining whether the sum of the currents is equal to 0, if not, returning to step S2, and updating the initial current in step S2 to the current of each RLC loop at the next time calculated in step S3, and updating the initial current sum in step S2 to the current of each RLC loop at the next time calculated in step S3; if yes, stopping repeating the steps S2-S3, and obtaining the current curve in each time interval.
2. The method for analyzing the dc inrush current after the single-ended blocking of the dc distribution network according to claim 1, wherein the setting the time interval specifically includes: and setting the size of the time interval according to the precision requirement of the direct current inrush current analysis.
3. The utility model provides a direct current distribution network single-ended DC inrush current analytic system after shutting which characterized in that includes:
the construction module is used for taking a lightning arrester branch in the direct-current power distribution network after single-end locking as a resistor, and enabling an unblocked converter station to be equivalent to an RLC (radio link control) circuit containing a capacitor and an inductor to construct an equivalent circuit;
the first calculation module is used for calculating to obtain an equivalent initial resistance according to the initial current of each RLC loop and the sum of the initial currents based on a lightning arrester volt-ampere characteristic curve, wherein the sum of the initial currents is the current flowing into a locked converter station from each unlocked converter station; substituting the initial resistance into a differential equation set of the equivalent circuit to calculate to obtain a time domain expression of the current of each RLC loop and the sum of the currents;
the second calculation module is used for setting a time interval, calculating the current of each RLC loop and the sum of each current at the next moment through the time domain expression and generating a current curve in the time interval;
and the analysis module is used for taking the current of each RLC loop at the next moment, which is obtained by the calculation of the second calculation module, as the initial current used by the first calculation module for the next calculation, and triggering the first calculation module after taking the sum of the currents of each RLC loop at the next moment, which is obtained by the calculation of the second calculation module, as the sum of the initial currents until the sum of the currents is equal to 0, so as to obtain a current curve in each time interval.
4. The system according to claim 3, wherein the second calculation module is specifically configured to:
setting the size of a time interval according to the precision requirement of the direct current inrush current analysis;
and calculating the current of each RLC loop and the sum of the currents at the next moment through the time domain expression, and generating a current curve in a time interval.
5. A DC inrush current analysis device after single-ended blocking of a DC power distribution network, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the method for analyzing the DC inrush current after single-ended blocking of the DC distribution network according to any one of claims 1-2 according to instructions in the program code.
6. A computer-readable storage medium, wherein the computer-readable storage medium is configured to store program code for executing the dc inrush current analysis method after single-ended blocking of the dc distribution network according to any one of claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210638188.7A CN114725908B (en) | 2022-06-08 | 2022-06-08 | Method for analyzing DC inrush current after single-end locking of DC power distribution network and related device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210638188.7A CN114725908B (en) | 2022-06-08 | 2022-06-08 | Method for analyzing DC inrush current after single-end locking of DC power distribution network and related device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114725908A CN114725908A (en) | 2022-07-08 |
| CN114725908B true CN114725908B (en) | 2022-09-13 |
Family
ID=82232491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210638188.7A Active CN114725908B (en) | 2022-06-08 | 2022-06-08 | Method for analyzing DC inrush current after single-end locking of DC power distribution network and related device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114725908B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677931A (en) * | 2017-08-22 | 2018-02-09 | 华北电力大学 | A kind of fault rapid identification method based on dc current waveform Curvature varying difference |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102036493B1 (en) * | 2013-09-30 | 2019-10-25 | 한국전력공사 | Apparatus for stopping test current during lightning impulse withstand voltage test of high voltage cable |
| CN108429252B (en) * | 2018-02-08 | 2020-12-04 | 中国科学院电工研究所 | Method for calculating contribution short-circuit current of alternating current system during direct current fault of multi-terminal alternating current-direct current hybrid power distribution network |
| CN110108921B (en) * | 2019-05-27 | 2020-04-07 | 山东大学 | Flexible direct-current power grid short-circuit current calculation method and system considering converter control |
| CN110212500B (en) * | 2019-06-06 | 2021-04-06 | 东北电力大学 | TWBS-HVDC short-circuit fault current calculation method |
| CN111245002B (en) * | 2020-03-02 | 2021-08-20 | 武汉大学 | MMC-based double-pole flexible direct-current power grid short-circuit and ground fault current prediction method |
| CN112505473B (en) * | 2020-10-21 | 2022-02-01 | 北京交通大学 | Analytic calculation method for bipolar short-circuit fault transient current of flexible direct-current power grid |
| CN113178851B (en) * | 2021-05-19 | 2022-09-27 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Method for solving overlarge excitation surge current of flexible direct-current connection transformer |
-
2022
- 2022-06-08 CN CN202210638188.7A patent/CN114725908B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677931A (en) * | 2017-08-22 | 2018-02-09 | 华北电力大学 | A kind of fault rapid identification method based on dc current waveform Curvature varying difference |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114725908A (en) | 2022-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | DC fault detection in meshed MTDC systems based on transient average value of current | |
| Expósito et al. | Reduced substation models for generalized state estimation | |
| Maguire et al. | Efficient techniques for real time simulation of MMC systems | |
| Xu et al. | High-speed EMT modeling of MMCs with arbitrary multiport submodule structures using generalized Norton equivalents | |
| Yu et al. | An equivalent calculation method for pole-to-ground fault transient characteristics of symmetrical monopolar MMC based DC grid | |
| Guo et al. | A method to calculate short-circuit faults in high-voltage DC grids | |
| CN109375034B (en) | Method for acquiring direct-current component of branch short-circuit current of power system | |
| Gajbhiye et al. | Computationally efficient methodology for analysis of faulted power systems with series-compensated transmission lines: A phase coordinate approach | |
| CN114725908B (en) | Method for analyzing DC inrush current after single-end locking of DC power distribution network and related device | |
| Xu et al. | Dc fault current calculation method in MMC‐HVDC grid considering current‐limiting devices | |
| Saciak et al. | A novel calculation method for steady-state short-circuit currents in Meshed DC-grids | |
| CN107453334B (en) | Visio-based transformer substation alternating current system breaker level difference matching verification method | |
| CN115980515A (en) | Single-phase earth fault positioning method | |
| CN107037321B (en) | Single-phase grounding steady-state calculation method of small-current grounding power system | |
| CN111799766B (en) | Offshore wind power flexible direct grid-connected overcurrent protection method, system and equipment | |
| CN115021206A (en) | High-resistance earth fault pilot protection method and device based on double-end zero-sequence current ratio | |
| CN109861214B (en) | Method and system for judging weak line with stable transient power angle of regional power grid | |
| Solodovnik et al. | Comparison of implicit and explicit integration techniques on the non-ideal transformer example | |
| Sorrentino | Understanding the effect of pre‐fault load flow on the effect of fault resistance on the impedance seen by the traditional ground distance function | |
| Gupta et al. | Artificial Neural Network based Fault Classifier and Locator for Transmission Line Protection | |
| CN111725818A (en) | Three-phase weak current network converter group grid-connected simulation method and simulation terminal | |
| Yan et al. | Modelling and simulation analysis of MMC‐HVDC system based on transient energy flow | |
| Babu et al. | An efficient power flow method for distribution system studies under various load models | |
| Xu et al. | Equivalent substitution method-based failures analysis for electromagnetic loop | |
| Lebedka et al. | Discrete models of the electric grid elements, obtained with using the second-order formula of implicit gear method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |