CN113241736A - Method and system for line protection adaptability analysis of new energy sending - Google Patents

Method and system for line protection adaptability analysis of new energy sending Download PDF

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Publication number
CN113241736A
CN113241736A CN202110389159.7A CN202110389159A CN113241736A CN 113241736 A CN113241736 A CN 113241736A CN 202110389159 A CN202110389159 A CN 202110389159A CN 113241736 A CN113241736 A CN 113241736A
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China
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new energy
model
protection
direct current
flexible direct
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Inventor
刘一民
王书扬
王兴国
郑少明
董鹏
梁英
杨国生
周泽昕
杜丁香
程琪
陈争光
郭雅蓉
曹虹
戴飞扬
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China Electric Power Research Institute Co Ltd CEPRI
North China Grid Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
North China Grid Co Ltd
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Priority to CN202110389159.7A priority Critical patent/CN113241736A/en
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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
    • H02H7/268—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

The invention discloses a method and a system for analyzing the protection adaptability of a new energy sending line, and belongs to the technical field of power systems and automation thereof. The method comprises the following steps: a flexible direct current power grid model and a new energy source model are built on a PSCAD electromagnetic transient simulation platform; the new energy model is accessed to the flexible direct current network model; carrying out short circuit test on a direct current line and a new energy source sending line of the flexible direct current power grid, and recording test points and recording wave recording waveforms of faults on two sides of the alternating current and direct current lines; aiming at a flexible direct current network model accessed to a new energy model, carrying out a simulation short circuit test, and recording a simulation waveform; monitoring the amplitude waveform and the phase angle waveform of the three-phase voltage/current fundamental wave at the main protection installation position of the new energy transmission line, and recording; determining a main protection simulation action of a new energy sending line; and carrying out adaptive analysis on the new energy transmission line protection according to the simulated action condition of the main protection. The invention can ensure the safe and reliable operation of the AC/DC power grid.

Description

Method and system for line protection adaptability analysis of new energy sending
Technical Field
The present invention relates to the field of power systems and automation technologies thereof, and more particularly, to a method and system for line protection adaptability analysis for new energy transmission.
Background
Flexible Direct Current transmission (VSC-HVDC) is a novel Direct Current transmission mode (High Voltage Direct Current, HVDC) based on a Voltage Source Converter (VSC) and a fully-controlled turn-off power electronic device, and is a more flexible, economical and environment-friendly transmission mode than conventional Line Commutated Converters (LCC) High Voltage Direct Current transmission. The flexible direct-current power transmission system constructed on the basis of the voltage source converter breaks the limitation of traditional direct-current point-to-point power transmission, can realize multi-end power transmission and finally forms a flexible direct-current power grid by interconnecting a large number of direct-current ends in a direct-current mode. From the economic and technical perspectives, the flexible direct current power grid has the advantages of power supply reliability, flexible operation and the like.
At present, a plurality of scientific and technical problems of the flexible direct current power grid still exist in the aspects of primary equipment such as a current converter and a circuit breaker, operation control, relay protection, large-scale high-precision simulation and the like, wherein a new energy containing a large amount of power electronic equipment is connected to a flexible direct current power grid converter station in a large-scale mode through an alternating current circuit, and the fault characteristics of the alternating current circuit are obviously influenced; the short-circuit current suppression strategy and the negative sequence current suppression strategy of the flexible-direct current converter, the fault current amplitude limiting strategy and the low-voltage ride-through characteristic of the photovoltaic inverter and the fan converter can have certain influence on the traditional current differential protection, distance protection and the like of an alternating current circuit, and the reliability of protection is reduced.
Disclosure of Invention
In view of the above problems, the present invention provides a method for analyzing the protection adaptability of a new energy transmission line, including:
the method comprises the following steps of constructing a flexible direct current power grid model and a new energy source model on a PSCAD electromagnetic transient simulation platform, wherein the new energy model comprises the following steps: a photovoltaic model and a double-fed/direct-driven fan model;
acquiring information parameters of a flexible direct current power grid and a new energy source sending line, and accessing a new energy source model into the flexible direct current power grid model according to the information parameters;
carrying out short circuit test on a direct current line and a new energy source sending line of the flexible direct current power grid, and recording test points and recording wave recording waveforms of faults on two sides of the alternating current and direct current lines;
selecting a test point corresponding to the test point in the flexible direct current network model aiming at the flexible direct current network model accessed to the new energy model, carrying out a simulation short circuit test, and recording a simulation waveform;
comparing the recorded waveform with the simulated waveform to obtain a data error, if the data error falls into a preset allowable range, carrying out in-region and out-region fault simulation on different types and different positions of a new energy transmission line of a flexible direct current network model accessed into the new energy model, monitoring the amplitude waveform and the phase angle waveform of a three-phase voltage/current fundamental wave at a main protection installation position of the new energy transmission line, and recording;
aiming at the main protection of the new energy transmission line, establishing a protection model, inputting the amplitude waveform and the phase angle waveform of the three-phase voltage/current fundamental wave into the protection model, and determining the main protection simulation action of the new energy transmission line;
and carrying out adaptive analysis on the new energy transmission line protection according to the simulated action condition of the main protection.
Optionally, the line protection is sent out to the new energy for adaptive analysis, specifically: and determining the reasonability of the new energy transmission line protection configuration and the correctness of the fixed value according to the simulated action condition of the main protection.
Optionally, the new energy is sent out of line main protection and is provided with pilot current differential protection.
Optionally, if the data error does not fall within the preset allowable range, modifying the flexible direct current power network model accessed to the new energy model until the data error falls within the preset allowable range.
Optionally, the flexible direct current power grid model is built according to the flexible direct current engineering primary equipment parameters and the control protection strategy.
Optionally, the new energy model is built according to the actual wiring condition of the new energy accessed to the flexible direct current power grid.
Optionally, simulating the action condition, including: analog motion and sensitivity of analog motion.
Optionally, if the simulated action is false or refused, or the sensitivity of the simulated action is not high, the new energy sending line protection configuration is not reasonable and the fixed value is incorrect, and the new energy sending line protection configuration and the fixed value are adjusted.
The invention also provides a system for the line protection adaptability analysis of new energy sending, which comprises the following steps:
the model building module builds a flexible direct current network model and a new energy source model on a PSCAD electromagnetic transient simulation platform, wherein the new energy source model comprises: a photovoltaic model and a double-fed/direct-driven fan model; acquiring information parameters of a flexible direct current power grid and a new energy source sending line, and accessing a new energy source model into the flexible direct current power grid model according to the information parameters;
the wave recording module is used for recording a test point for performing a short-circuit test on a direct-current line and a new energy source delivery line of the flexible direct-current power grid and wave recording waveforms of faults on two sides of the alternating-current and direct-current lines;
the first simulation module is used for selecting a test point corresponding to the test point in the flexible direct current network model aiming at the flexible direct current network model accessed to the new energy model, carrying out a simulation short circuit test and recording a simulation waveform;
the second simulation module is used for comparing the recording waveform with the simulation waveform to obtain a data error, carrying out in-region and out-region fault simulation of different types and different positions aiming at a new energy source sending line of a flexible direct current network model accessed to a new energy source model if the data error falls into a preset allowable range, monitoring the amplitude waveform and the phase angle waveform of a three-phase voltage/current fundamental wave at the main protection installation position of the new energy source sending line, and recording;
the third simulation module is used for establishing a protection model aiming at the main protection of the new energy transmission line, inputting the amplitude waveform and the phase angle waveform of the three-phase voltage/current fundamental wave into the protection model and determining the main protection simulation action of the new energy transmission line;
and the analysis module is used for carrying out adaptive analysis on the new energy transmission line protection according to the simulated action condition of the main protection.
Optionally, the line protection is sent out to the new energy for adaptive analysis, specifically: and determining the reasonability of the new energy transmission line protection configuration and the correctness of the fixed value according to the simulated action condition of the main protection.
Optionally, the new energy is sent out of line main protection and is provided with pilot current differential protection.
Optionally, if the data error does not fall within the preset allowable range, modifying the flexible direct current power network model accessed to the new energy model until the data error falls within the preset allowable range.
Optionally, the flexible direct current power grid model is built according to the flexible direct current engineering primary equipment parameters and the control protection strategy.
Optionally, the new energy model is built according to the actual wiring condition of the new energy accessed to the flexible direct current power grid.
Optionally, simulating the action condition, including: analog motion and sensitivity of analog motion.
Optionally, if the simulated action is false or refused, or the sensitivity of the simulated action is not high, the new energy sending line protection configuration is not reasonable and the fixed value is incorrect, and the new energy sending line protection configuration and the fixed value are adjusted.
The method is suitable for the main protection adaptability analysis of the alternating current line of the new energy large-scale access flexible direct current power grid, can effectively check the correctness of the main protection constant value setting of the alternating current under the background of the new energy large-scale access flexible direct current power grid, and ensures the safe and reliable operation of the alternating current and direct current power grid.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a three-fold braking characteristic curve diagram of the current differential protection according to the embodiment of the present invention;
FIG. 3 is a graph illustrating the operation characteristics of intra-zone fault current differential protection according to an embodiment of the present invention;
FIG. 4 is a graph illustrating the operation characteristics of the differential protection for the out-of-range fault current according to the present invention;
FIG. 5 is a graph of the sensitivity of the current differential protection according to the embodiment of the present invention;
fig. 6 is a block diagram of the system of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including 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. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for line protection adaptability analysis of new energy sending, as shown in fig. 1, comprising the following steps:
the method comprises the following steps of constructing a flexible direct current power grid model and a new energy source model on a PSCAD electromagnetic transient simulation platform, wherein the new energy model comprises the following steps: a photovoltaic model and a double-fed/direct-driven fan model;
acquiring information parameters of a flexible direct current power grid and a new energy source sending line, and accessing a new energy source model into the flexible direct current power grid model according to the information parameters;
carrying out short circuit test on a direct current line and a new energy source sending line of the flexible direct current power grid, and recording test points and recording wave recording waveforms of faults on two sides of the alternating current and direct current lines;
selecting a test point corresponding to the test point in the flexible direct current network model aiming at the flexible direct current network model accessed to the new energy model, carrying out a simulation short circuit test, and recording a simulation waveform;
comparing the recorded waveform with the simulated waveform to obtain a data error, if the data error falls into a preset allowable range, carrying out in-region and out-region fault simulation on different types and different positions of a new energy transmission line of a flexible direct current network model accessed into the new energy model, monitoring the amplitude waveform and the phase angle waveform of a three-phase voltage/current fundamental wave at a main protection installation position of the new energy transmission line, and recording;
aiming at the main protection of the new energy transmission line, establishing a protection model, inputting the amplitude waveform and the phase angle waveform of the three-phase voltage/current fundamental wave into the protection model, and determining the main protection simulation action of the new energy transmission line;
and carrying out adaptive analysis on the new energy transmission line protection according to the simulated action condition of the main protection.
Wherein, send out the line protection to the new forms of energy and carry out the adaptability analysis, specifically do: and determining the reasonability of the new energy transmission line protection configuration and the correctness of the fixed value according to the simulated action condition of the main protection.
Wherein, the new energy sends out the line main protection, is equipped with the differential protection of tandem current.
And if the data error does not fall into the preset allowable range, modifying the flexible direct current power grid model accessed into the new energy model until the data error falls into the preset allowable range.
And the flexible direct current power grid model is built according to the flexible direct current engineering primary equipment parameters and the control protection strategy.
The new energy model is built according to the actual wiring condition of the new energy accessed to the flexible direct current power grid.
Wherein, the simulation action condition includes: analog motion and sensitivity of analog motion.
If the simulation action is mistaken or refused, or the sensitivity of the simulation action is not high, the irrational and incorrect fixed value of the new energy sending line protection configuration adjusts the new energy sending line protection configuration and the fixed value.
The invention is further illustrated by the following examples:
the flow of this embodiment is as follows:
according to the primary equipment parameters of the flexible direct current engineering and a control protection strategy, a flexible direct current power grid model containing a direct current control protection system is built on a PSCAD electromagnetic transient simulation platform; the flexible dc power network model should include, but is not limited to, the following modules: the system comprises an MMC converter valve, a converter transformer, an energy consumption branch circuit, a direct current breaker, a smoothing reactor, a direct current circuit, a station control module, a pole control module, a valve control module, a protection module and the like.
According to the practical situation that a photovoltaic power station is connected into a power grid, a photovoltaic model is built on an electromagnetic transient simulation platform, and the photovoltaic model comprises the following modules: the photovoltaic power generation system comprises a photovoltaic cell panel, a direct current capacitor, an inverter, a link reactor, a filter, a boost transformer, a voltage outer ring and current inner ring module, a Maximum Power Point Tracking (MPPT) module, a Low Voltage Ride Through (LVRT) module and the like.
According to the practical situation that a wind power plant is connected into a flexible direct-current power grid, a double-fed/direct-driven wind turbine model is built on an electromagnetic transient simulation platform, wherein the wind turbine model comprises but is not limited to the following modules: asynchronous machine, wind turbine, converter control module, connection transformer, boost transformer, etc.
According to the topological relation of the new energy field stations and the flexible direct current converter station wiring and the actual parameters of the new energy sending-out line, the new energy model is connected into the built flexible direct current power grid model, the matching relation of the unlocking time of each flexible direct current converter station, the unlocking time of the photovoltaic inverter and the unlocking time of the fan converter is fully considered during connection, and each new energy field station can output power after the flexible direct current power grid stably runs.
And (4) carrying out manual short-circuit experiments on all direct current lines and all new energy source sending lines of the flexible direct current power grid, and recording fault recording waveforms on two sides of the related alternating current and direct current lines.
And selecting a short circuit point corresponding to an actual manual short circuit experiment from the built flexible direct current power grid model containing large-scale new energy access, developing fault simulation, and recording a simulation waveform.
Comparing the data obtained by the field fault test with the data obtained by the model simulation, and if the data error is within the allowable range of the practical engineering application, verifying the accuracy of the model; if the difference between the measured data and the simulation data is large, the simulation model cannot accurately reflect the actual power system, and the model needs to be modified for accuracy verification.
Carrying out different types and different positions of in-region and out-region fault simulation on all new energy transmission lines, monitoring amplitude phase angles of three-phase voltage and fundamental wave of current at two end protection installation positions of two cycles after related line faults, (other special data can be determined according to actual protection configuration), and recording; on a scientific computing software platform, carrying out protection principle programming aiming at the configured main protection of the related line, namely building a protection model; generally, the ac transmission line main protection is provided with a pilot current differential protection.
And inputting simulation waveforms of various fault conditions of a typical line into a protection program to obtain the action condition of target line configuration protection, and finishing the analysis of the alternating current protection adaptability of all new energy sending lines according to the evaluation of the rationality of the target line protection configuration and the correctness of the fixed value.
Taking the pilot current differential protection as an example, the main protection adaptability analysis has the following specific flow:
obtaining the key constant values of the differential protection, including a differential current starting value, a braking coefficient and the like, according to the specification and the constant value list of the differential protection, programming and reproducing the action characteristics of the current differential protection on a scientific computing software platform, wherein the typical differential characteristics are shown as the formula (1):
Iact≥Iact.0+Kl(Ires.1-Ires.0)+K2(Ires.2-Ires.1) (I)
the current differential protection three-fold line braking characteristic is shown in FIG. 2;
wherein, Iact.0Is the minimum starting current; k1，K2First-level and second-level braking coefficients respectively, the first section of the braking characteristic is a horizontal line and is a braking-free section, because when the short-circuit current is small, the unbalanced current is also small, the braking effect is not obvious and the braking is not needed, Iact.0According to the maximum unbalance current setting under the maximum load current, the second section is a braking section with smaller braking action, and the slope K of the second section is1Smaller to avoid braking amount at Ires.0And Ires.1The maximum unbalanced current is set, the third section is a braking section with larger braking action, and the slope K2Larger, can be kept in the braking amount Ires.1And Ires.2And adjusting the maximum unbalanced current in the process.
Programming and reading a new energy source, sending out line fault record, extracting differential current and brake current, drawing a characteristic diagram of the differential current and the brake current before and after the fault on a current differential protection action characteristic diagram, observing the condition of the current differential protection action after the fault, and for the fault in a region, the differential current/the brake current is below the current differential protection action characteristic; for an out-of-band fault, the differential current/braking current should be above the current differential protection action characteristic. Taking the current differential protection of a certain manufacturer as an example, under a reference constant value, the operation characteristic diagrams of the in-zone and out-zone protection are shown in fig. 3 and fig. 4:
according to a differential protection starting value I aiming at the zone faultact.0Coefficient of braking K1,K2And a differential current IactBraking current IresCalculating the differential protection sensitivity KSENAs shown in formula (2):
Figure BDA0003015791550000081
programming a program in programming software, analyzing a time-dependent change diagram of the sensitivity of main protection of an alternating current transmission line before and after a fault, taking current differential protection of a certain manufacturer as an example, under a reference constant value, the time-dependent change of the protection sensitivity is shown in fig. 5:
performing the above adaptability analysis on all new energy transmission lines, finding protection malfunction/failure and sensitivity deficiency, and adjusting the fixed value of corresponding protection, such as Iact.0，K1，K2，Ires.0，Ires.1And Ires.2And the like.
The present invention further provides a system 200 for line protection adaptability analysis of new energy transmission, as shown in fig. 6, including:
the model building module 201 builds a flexible direct current power grid model and a new energy source model on a PSCAD electromagnetic transient simulation platform, wherein the new energy source model comprises: a photovoltaic model and a double-fed/direct-driven fan model; acquiring information parameters of a flexible direct current power grid and a new energy source sending line, and accessing a new energy source model into the flexible direct current power grid model according to the information parameters;
the wave recording module 202 is used for recording a test point for performing a short circuit test on a direct current line and a new energy source sending-out line of the flexible direct current power grid and wave recording waveforms of faults on two sides of the alternating current-direct current line;
the first simulation module 203 selects a test point corresponding to the test point in the flexible direct current network model aiming at the flexible direct current network model accessed to the new energy model, performs a simulation short circuit test, and records a simulation waveform;
the second simulation module 204 is used for comparing the recording waveform with the simulation waveform to obtain a data error, carrying out in-area and out-area fault simulation on different types and different positions of a new energy transmission line of the flexible direct current network model accessed to the new energy model if the data error falls into a preset allowable range, monitoring the amplitude waveform and the phase angle waveform of the three-phase voltage/current fundamental wave at the main protection installation position of the new energy transmission line, and recording;
the third simulation module 205 is configured to establish a protection model for main protection of the new energy transmission line, input an amplitude waveform and a phase angle waveform of a three-phase voltage/current fundamental wave to the protection model, and determine a main protection simulation action of the new energy transmission line;
and the analysis module 206 is used for carrying out adaptive analysis on the new energy transmission line protection according to the simulation action condition of the main protection.
Wherein, send out the line protection to the new forms of energy and carry out the adaptability analysis, specifically do: and determining the reasonability of the new energy transmission line protection configuration and the correctness of the fixed value according to the simulated action condition of the main protection.
Wherein, the new energy sends out the line main protection, is equipped with the differential protection of tandem current.
And if the data error does not fall into the preset allowable range, modifying the flexible direct current power grid model accessed into the new energy model until the data error falls into the preset allowable range.
And the flexible direct current power grid model is built according to the flexible direct current engineering primary equipment parameters and the control protection strategy.
The new energy model is built according to the actual wiring condition of the new energy accessed to the flexible direct current power grid.
Wherein, the simulation action condition includes: analog motion and sensitivity of analog motion.
If the simulation action is mistaken or refused, or the sensitivity of the simulation action is not high, the irrational and incorrect fixed value of the new energy sending line protection configuration adjusts the new energy sending line protection configuration and the fixed value.
The method is suitable for the main protection adaptability analysis of the alternating current line of the new energy large-scale access flexible direct current power grid, can effectively check the correctness of the main protection constant value setting of the alternating current under the background of the new energy large-scale access flexible direct current power grid, and ensures the safe and reliable operation of the alternating current and direct current power grid.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (16)

1. A method for new energy egress line protection suitability analysis, the method comprising:
the method comprises the following steps of constructing a flexible direct current power grid model and a new energy source model on a PSCAD electromagnetic transient simulation platform, wherein the new energy model comprises the following steps: a photovoltaic model and a double-fed/direct-driven fan model;
acquiring information parameters of a flexible direct current power grid and a new energy source sending line, and accessing a new energy source model into the flexible direct current power grid model according to the information parameters;
carrying out short circuit test on a direct current line and a new energy source sending line of the flexible direct current power grid, and recording test points and recording wave recording waveforms of faults on two sides of the alternating current and direct current lines;
selecting a test point corresponding to the test point in the flexible direct current network model aiming at the flexible direct current network model accessed to the new energy model, carrying out a simulation short circuit test, and recording a simulation waveform;
comparing the recorded waveform with the simulated waveform to obtain a data error, if the data error falls into a preset allowable range, carrying out in-region and out-region fault simulation on different types and different positions of a new energy transmission line of a flexible direct current network model accessed into the new energy model, monitoring the amplitude waveform and the phase angle waveform of a three-phase voltage/current fundamental wave at a main protection installation position of the new energy transmission line, and recording;
aiming at the main protection of the new energy transmission line, establishing a protection model, inputting the amplitude waveform and the phase angle waveform of the three-phase voltage/current fundamental wave into the protection model, and determining the main protection simulation action of the new energy transmission line;
and carrying out adaptive analysis on the new energy transmission line protection according to the simulated action condition of the main protection.
2. The method according to claim 1, wherein the adaptive analysis of the protection of the new energy transmission line is performed by: and determining the reasonability of the new energy transmission line protection configuration and the correctness of the fixed value according to the simulated action condition of the main protection.
3. The method of claim 1, wherein the new energy source is sent out of line main protection equipped with tandem current differential protection.
4. The method according to claim 1, wherein if the data error does not fall within a preset allowable range, the flexible direct current power grid model accessed to the new energy model is modified until the data error falls within the preset allowable range.
5. The method of claim 1, wherein the flexible direct current grid model is built according to flexible direct engineering primary equipment parameters and control protection strategies.
6. The method according to claim 1, wherein the new energy model is built according to actual wiring conditions of new energy accessed to the flexible direct current power grid.
7. The method of claim 1, the simulating an action scenario, comprising: analog motion and sensitivity of analog motion.
8. The method according to claim 7, wherein if the simulation action is false or refused, or the sensitivity of the simulation action is not high, the new energy source sending line protection configuration and the fixed value are adjusted if the new energy source sending line protection configuration is not reasonable and the fixed value is incorrect.
9. A system for new energy egress line protection suitability analysis, the system comprising:
the model building module builds a flexible direct current network model and a new energy source model on a PSCAD electromagnetic transient simulation platform, wherein the new energy source model comprises: a photovoltaic model and a double-fed/direct-driven fan model; acquiring information parameters of a flexible direct current power grid and a new energy source sending line, and accessing a new energy source model into the flexible direct current power grid model according to the information parameters;
the wave recording module is used for recording a test point for performing a short-circuit test on a direct-current line and a new energy source delivery line of the flexible direct-current power grid and wave recording waveforms of faults on two sides of the alternating-current and direct-current lines;
the first simulation module is used for selecting a test point corresponding to the test point in the flexible direct current network model aiming at the flexible direct current network model accessed to the new energy model, carrying out a simulation short circuit test and recording a simulation waveform;
the second simulation module is used for comparing the recording waveform with the simulation waveform to obtain a data error, carrying out in-region and out-region fault simulation of different types and different positions aiming at a new energy source sending line of a flexible direct current network model accessed to a new energy source model if the data error falls into a preset allowable range, monitoring the amplitude waveform and the phase angle waveform of a three-phase voltage/current fundamental wave at the main protection installation position of the new energy source sending line, and recording;
the third simulation module is used for establishing a protection model aiming at the main protection of the new energy transmission line, inputting the amplitude waveform and the phase angle waveform of the three-phase voltage/current fundamental wave into the protection model and determining the main protection simulation action of the new energy transmission line;
and the analysis module is used for carrying out adaptive analysis on the new energy transmission line protection according to the simulated action condition of the main protection.
10. The system according to claim 9, wherein the adaptive analysis of the protection of the new energy transmission line is specifically: and determining the reasonability of the new energy transmission line protection configuration and the correctness of the fixed value according to the simulated action condition of the main protection.
11. The system of claim 9, wherein the new energy source is sent out of line main protection equipped with tandem current differential protection.
12. The system according to claim 9, wherein if the data error does not fall within the preset allowable range, the flexible direct current power grid model accessed to the new energy model is modified until the data error falls within the preset allowable range.
13. The system of claim 9, wherein the flexible dc power grid model is constructed from flexible dc engineering primary equipment parameters and control protection strategies.
14. The system according to claim 9, wherein the new energy model is built according to actual wiring conditions of new energy accessed to the flexible direct current power grid.
15. The system of claim 9, the simulated action scenario, comprising: analog motion and sensitivity of analog motion.
16. The system of claim 15, wherein if the simulated action is false or refused, or the sensitivity of the simulated action is not high, the new energy source sending line protection configuration and the fixed value are adjusted if the new energy source sending line protection configuration is not reasonable and the fixed value is incorrect.
CN202110389159.7A 2021-04-12 2021-04-12 Method and system for line protection adaptability analysis of new energy sending Pending CN113241736A (en)

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