CN116111644A - Grid-connected parameter setting auxiliary decision-making method, device, storage medium and system - Google Patents
Grid-connected parameter setting auxiliary decision-making method, device, storage medium and system Download PDFInfo
- Publication number
- CN116111644A CN116111644A CN202310006341.9A CN202310006341A CN116111644A CN 116111644 A CN116111644 A CN 116111644A CN 202310006341 A CN202310006341 A CN 202310006341A CN 116111644 A CN116111644 A CN 116111644A
- Authority
- CN
- China
- Prior art keywords
- short
- decided
- circuit ratio
- grid
- circuit
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a grid-connected parameter setting auxiliary decision-making method, a device, a storage medium and a system. By adding a preset short-circuit ratio calculating element into a traditional electromagnetic simulation model, the system can calculate the short-circuit ratio and the limit short-circuit ratio during simulation operation, and store and compare the short-circuit ratio, the limit short-circuit ratio and corresponding operation parameter groups, so that a stable parameter range is determined to provide data support for auxiliary decision making.
Description
Technical Field
The present invention relates to the field of auxiliary decision making for grid-connected parameter setting, and in particular, to a method, an apparatus, a computer readable storage medium and a system for auxiliary decision making for grid-connected parameter setting.
Background
As the power grid system gradually expands the scale of accessing new energy, a large amount of power generation equipment, energy storage equipment and the like of renewable energy are accessed into the power grid, the voltage regulation capability of a new energy unit is insufficient, and the problem that the new energy unit is easy to be disconnected due to voltage fluctuation when the power grid system is connected with a weak power grid is more serious. The stability of new energy and the influence mechanism on the system stability are partially and clearly studied, but the influence of the new energy on the system strength and the short-circuit ratio is not deep enough, and the algorithm construction of the model module is not comprehensive enough. The short-circuit ratio is proposed in the initial analysis of the grid-connected system of direct current transmission, and is widely used later, mainly for judging the stability of the power grid, but the short-circuit ratio has limitations, and further a multi-feed-in short-circuit ratio is proposed. The multi-feed short-circuit ratio is characterized by being used for analyzing the coupling property among a plurality of network points, but the accuracy of the index is not high. Further we propose a generalized short-circuit ratio, mainly for describing the stabilization of the static voltage. The short-circuit ratio is an important indicator for analyzing the system strength and system stability.
In the prior art, the calculation of the traditional short-circuit ratio is generally only to use the power grid parameters and the equipment capacity, and the calculation is simple and standard division is clear, so that in recent years, the related index of the short-circuit ratio is gradually widely applied to the planning of each power grid system globally. The electromagnetic simulation is to analyze and simulate the changes of the electric field and the magnetic field and the corresponding voltage and current in the electronic element, the key parameters can be adjusted at will, and a certain link and a certain part can be analyzed independently according to the requirements of users, so that the electromagnetic simulation has the characteristics of flexibility, comprehensiveness and depth. And transient overvoltage and overcurrent which may occur when a fault occurs can be analyzed and calculated, and then whether equipment can normally operate or not is determined, and corresponding limiting and protecting measures are customized for the equipment. Electromagnetic simulation has been widely used in the market of the electromagnetic field at present.
However, the prior art still has the following drawbacks: in simulation modeling, a large amount of new energy equipment is generally regarded as a whole, and the supporting effect of new energy on short-circuit current is ignored, so that the calculation result cannot accurately reflect the strength of a power grid, and an effective data support cannot be provided for the prediction of system faults.
Accordingly, there is a need for a grid-tie parameter setting aid decision making method, apparatus, computer readable storage medium, and system that overcomes the above-described deficiencies in the prior art.
Disclosure of Invention
The embodiment of the invention provides a grid-connected parameter setting auxiliary decision-making method, a device, a computer-readable storage medium and a system, so that the auxiliary decision-making efficiency and accuracy are improved.
An embodiment of the present invention provides a grid-connected parameter setting auxiliary decision method, which includes: acquiring parameters to be decided, main network operation parameters and sub-network operation parameters of a system to be decided, and constructing an electromagnetic simulation model corresponding to the system to be decided according to the main network operation parameters and the sub-network operation parameters; obtaining an operation parameter set and a short circuit simulation result data set of the electromagnetic simulation model according to the electromagnetic simulation model through a preset short circuit ratio calculation element and a preset three-phase short circuit fault generator; and acquiring a stable parameter range of the system to be decided according to the operation parameter set and the short circuit simulation result data set, and performing auxiliary decision of grid-connected parameter setting on the parameter to be decided according to the stable parameter range.
As an improvement of the above solution, the method for obtaining, according to the electromagnetic simulation model, the operation parameter set and the short-circuit simulation result data set of the electromagnetic simulation model by using a preset short-circuit ratio calculation element and a preset three-phase short-circuit fault generator specifically includes: when the electromagnetic simulation model is operated, triggering a preset three-phase short circuit fault generator, and determining a fault occurrence point; determining a corresponding element to be measured according to the fault occurrence point, and measuring the voltage and the current of the element to be measured; calculating the short circuit ratio and the limit short circuit ratio of the system to be decided according to a preset short circuit ratio calculation formula, the voltage and the current through preset short circuit ratio calculation software; storing the voltage and the current into an operation parameter group, and storing the short circuit ratio and the limit short circuit ratio into a short circuit simulation result data group.
As an improvement of the above scheme, calculating the short-circuit ratio and the limit short-circuit ratio of the system to be decided according to a preset short-circuit ratio calculation formula, the voltage and the current specifically includes: judging the type of the system to be decided and acquiring a preset short circuit ratio calculation formula; the short-circuit ratio calculation formula comprises a single-feed short-circuit ratio formula and a multi-feed short-circuit ratio formula; when the system to be decided is a single feeder system, respectively calculating a first short-circuit ratio of the system to be decided in a stable state and a first limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset single feed-in short-circuit ratio formula; and when the system to be decided is a multi-feeder system, respectively calculating a second short-circuit ratio of the system to be decided in a stable state and a second limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset multi-feed-in short-circuit ratio formula.
As an improvement of the above scheme, the single feed short-circuit ratio formula is:
wherein S is ac For short-circuit capacity, p N Is the rated capacity of new energy.
As an improvement of the above scheme, the multi-feed short-circuit ratio formula is:
wherein SCR-Ui represents voltage support at i in grid connection, U N Represents neutral point voltage, ">
Indicating AC system power supply->
Indicating the voltage variation of node i, U i Representing the node i voltage.
As an improvement of the above solution, calculating the first short-circuit ratio of the system to be decided in the stable state and the first limit short-circuit ratio of the system to be decided in the unstable state respectively specifically includes: judging the real-time stability state of the system to be decided according to the main network operation parameters and the sub-network operation parameters; when the system to be decided is in a stable state, calculating a first short circuit ratio of the system to be decided in the stable state according to the single feed-in short circuit ratio formula; when the system to be decided is in an unstable state, calculating a first limit short-circuit ratio of the system to be decided in the unstable state according to the single-feed short-circuit ratio formula.
As an improvement of the above solution, the determining the real-time stability state of the to-be-decided system according to the main network operation parameter and the subnet operation parameter specifically includes: recording the first time when the voltage drop of the central point bus of the system is continuously lower than 0.75pu in transient and dynamic processes, and the voltage of the central point bus of 220kV and above voltage class after the dynamic processes subside; if the first time is not more than 1s and the bus voltage is not less than 0.9pu, judging that the system to be decided is in a stable state; otherwise, judging that the system to be decided is in an unstable state.
The invention further provides a grid-connected parameter setting auxiliary decision device, which comprises a model construction unit, a simulation calculation unit and an auxiliary decision unit, wherein the model construction unit is used for acquiring parameters to be decided, main network operation parameters and sub-network operation parameters of a system to be decided and constructing an electromagnetic simulation model corresponding to the system to be decided according to the main network operation parameters and the sub-network operation parameters; the simulation calculation unit is used for obtaining an operation parameter set and a short circuit simulation result data set of the electromagnetic simulation model according to the electromagnetic simulation model through a preset short circuit ratio calculation element and a preset three-phase short circuit fault generator; the auxiliary decision unit is used for acquiring a stable parameter range of the system to be decided according to the operation parameter set and the short circuit simulation result data set, and carrying out auxiliary decision of grid-connected parameter setting on the parameter to be decided according to the stable parameter range.
As an improvement of the above solution, the simulation calculation unit is further configured to: when the electromagnetic simulation model is operated, triggering a preset three-phase short circuit fault generator, and determining a fault occurrence point; determining a corresponding element to be measured according to the fault occurrence point, and measuring the voltage and the current of the element to be measured; calculating the short circuit ratio and the limit short circuit ratio of the system to be decided according to a preset short circuit ratio calculation formula, the voltage and the current through preset short circuit ratio calculation software; storing the voltage and the current into an operation parameter group, and storing the short circuit ratio and the limit short circuit ratio into a short circuit simulation result data group.
As an improvement of the above solution, the simulation calculation unit is further configured to: judging the type of the system to be decided and acquiring a preset short circuit ratio calculation formula; the short-circuit ratio calculation formula comprises a single-feed short-circuit ratio formula and a multi-feed short-circuit ratio formula; when the system to be decided is a single feeder system, respectively calculating a first short-circuit ratio of the system to be decided in a stable state and a first limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset single feed-in short-circuit ratio formula; and when the system to be decided is a multi-feeder system, respectively calculating a second short-circuit ratio of the system to be decided in a stable state and a second limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset multi-feed-in short-circuit ratio formula.
As an improvement of the above solution, the simulation calculation unit is further configured to: judging the real-time stability state of the system to be decided according to the main network operation parameters and the sub-network operation parameters; when the system to be decided is in a stable state, calculating a first short circuit ratio of the system to be decided in the stable state according to the single feed-in short circuit ratio formula; when the system to be decided is in an unstable state, calculating a first limit short-circuit ratio of the system to be decided in the unstable state according to the single-feed short-circuit ratio formula.
As an improvement of the above solution, the simulation calculation unit is further configured to: recording the first time when the voltage drop of the central point bus of the system is continuously lower than 0.75pu in transient and dynamic processes, and the voltage of the central point bus of 220kV and above voltage class after the dynamic processes subside; if the first time is not more than 1s and the bus voltage is not less than 0.9pu, judging that the system to be decided is in a stable state; otherwise, judging that the system to be decided is in an unstable state.
Another embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, and when the computer program runs, controls a device where the computer readable storage medium is located to execute the grid-connected parameter setting auxiliary decision method as described above.
Another embodiment of the present invention provides a grid-tie parameter setting aid decision system comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing a grid-tie parameter setting aid decision method as described above when executing the computer program.
Compared with the prior art, the technical scheme has the following beneficial effects:
the invention provides a grid-connected parameter setting auxiliary decision-making method, a device, a computer readable storage medium and a system, wherein a preset short-circuit ratio calculating element is added into a traditional electromagnetic simulation model, so that the system can calculate a short-circuit ratio and a limit short-circuit ratio during simulation operation, and the short-circuit ratio, the limit short-circuit ratio and a corresponding operation parameter set are stored and compared, so that a stable parameter range is determined to provide data support for auxiliary decision-making.
Drawings
FIG. 1 is a schematic flow chart of a grid-connected parameter setting aid decision-making method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a grid-connected parameter setting auxiliary decision-making device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Detailed description of the preferred embodiments
The embodiment of the invention firstly describes a grid-connected parameter setting auxiliary decision-making method. Fig. 1 is a flowchart of a grid-connected parameter setting assistant decision method according to an embodiment of the present invention.
As shown in fig. 1, the grid-connected parameter setting auxiliary decision method includes:
s1, acquiring parameters to be decided, main network operation parameters and sub-network operation parameters of a system to be decided, and constructing an electromagnetic simulation model corresponding to the system to be decided according to the main network operation parameters and the sub-network operation parameters.
Providing basis for establishing electromagnetic simulation models, comprising the following steps: the main network operation basic parameters are obtained from the target power grid, and the operation parameters and the equipment parameters provide a basis for establishing an electromagnetic model; the basic parameters of new energy operation (described as "subnet operation parameters" in the embodiment of the invention) include control parameters and main power supply parameters, and provide a basis for establishing an accurate new energy electromagnetic model.
After the data support is provided, a complete and operable system is established in simulation software, and the system comprises a generator set, a new energy set, a transformer load, a transmission line and the like.
S2, obtaining an operation parameter set and a short circuit simulation result data set of the electromagnetic simulation model according to the electromagnetic simulation model through a preset short circuit ratio calculation element and a preset three-phase short circuit fault generator.
In order to obtain the short-circuit ratio of the system at the running time more quickly and efficiently, the embodiment of the invention establishes a packaged preset short-circuit ratio calculating element in electromagnetic simulation, and the short-circuit ratio calculation covers the short-circuit ratio calculation under various network topological structures, such as single-feed short-circuit ratio and multi-feed short-circuit ratio.
In order to provide data support for short-circuit ratio calculation, the embodiment of the invention sets a three-phase short-circuit fault in the simulation system through a preset three-phase short-circuit fault generator, measures and outputs rated power and short-circuit current, and inputs parameters to each element in electromagnetic simulation according to default parameters in software and modeling requirements of users, thereby completing the establishment of an electromagnetic simulation model; then, checking and parameter adjustment are carried out on the electromagnetic simulation model, so that the model can be ensured to normally run, and the result and the waveform of the required variable can be output after the simulation is completed; then triggering a three-phase short circuit fault generator (selecting a fault grounding option), and selecting rated voltage and short circuit current from measurement options of elements nearby a fault occurrence point to measure; and finally, calculating the short-circuit ratio of the system containing the new energy by adopting a short-circuit ratio calculating element.
When calculating the short-circuit ratio, the short-circuit ratio calculation formula needs to be divided into a single-feed short-circuit ratio and a multi-feed short-circuit ratio in detail, wherein the single-feed short-circuit ratio refers to the traditional single-feed alternating-current and direct-current short-circuit ratio calculation, an alternating-current system in the single-feed alternating-current and direct-current system is generally simplified into an ideal voltage source series equivalent impedance by using a Thevenin equivalent method, and the multi-feed short-circuit ratio refers to the definition of the short-circuit ratio of the multi-feed alternating-current and direct-current system considering interaction among multi-feed branches.
In one embodiment, the single feed short ratio formula is:
wherein S is ac For short-circuit capacity, p N Is the rated capacity of new energy.
In one embodiment, the multi-feed short ratio formula is:
wherein SCR-Ui represents voltage support at i in grid connection, U N Which represents the voltage at the neutral point,
indicating AC system power supply->
Indicating the voltage variation of node i, U i Representing the node i voltage.
In one embodiment, the operation parameter set and the short circuit simulation result data set of the electromagnetic simulation model are obtained according to the electromagnetic simulation model through a preset short circuit ratio calculation element and a preset three-phase short circuit fault generator, and specifically include: when the electromagnetic simulation model is operated, triggering a preset three-phase short circuit fault generator, and determining a fault occurrence point; determining a corresponding element to be measured according to the fault occurrence point, and measuring the voltage and the current of the element to be measured; calculating the short circuit ratio and the limit short circuit ratio of the system to be decided according to a preset short circuit ratio calculation formula, the voltage and the current through preset short circuit ratio calculation software; storing the voltage and the current into an operation parameter group, and storing the short circuit ratio and the limit short circuit ratio into a short circuit simulation result data group.
In one embodiment, calculating the short-circuit ratio and the limit short-circuit ratio of the system to be decided according to a preset short-circuit ratio calculation formula, the voltage and the current specifically includes: judging the type of the system to be decided and acquiring a preset short circuit ratio calculation formula; the short-circuit ratio calculation formula comprises a single-feed short-circuit ratio formula and a multi-feed short-circuit ratio formula; when the system to be decided is a single feeder system, respectively calculating a first short-circuit ratio of the system to be decided in a stable state and a first limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset single feed-in short-circuit ratio formula; and when the system to be decided is a multi-feeder system, respectively calculating a second short-circuit ratio of the system to be decided in a stable state and a second limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset multi-feed-in short-circuit ratio formula.
In one embodiment, the calculating the first short-circuit ratio of the system to be decided in the stable state and the first limit short-circuit ratio of the system to be decided in the unstable state respectively specifically includes: judging the real-time stability state of the system to be decided according to the main network operation parameters and the sub-network operation parameters; when the system to be decided is in a stable state, calculating a first short circuit ratio of the system to be decided in the stable state according to the single feed-in short circuit ratio formula; when the system to be decided is in an unstable state, calculating a first limit short-circuit ratio of the system to be decided in the unstable state according to the single-feed short-circuit ratio formula.
Because the data output of the traditional short-circuit ratio calculation model has limitation and the limit short-circuit ratio of the system in the unstability critical state cannot be monitored, the embodiment of the invention can monitor and judge the real-time stability state of the system in the data acquisition process. In one embodiment, the determining the real-time stability state of the to-be-decided system according to the main network operation parameter and the subnet operation parameter specifically includes: recording the first time when the voltage drop of the central point bus of the system is continuously lower than 0.75pu in transient and dynamic processes, and the voltage of the central point bus of 220kV and above voltage class after the dynamic processes subside; if the first time is not more than 1s and the bus voltage is not less than 0.9pu, judging that the system to be decided is in a stable state; otherwise, judging that the system to be decided is in an unstable state.
And S3, acquiring a stable parameter range of the system to be decided according to the operation parameter set and the short circuit simulation result data set, and performing auxiliary decision of grid-connected parameter setting on the parameter to be decided according to the stable parameter range.
The traditional short-circuit ratio module utilizes elements to build a short-circuit ratio calculation function in an electromagnetic simulation model, only outputs the short-circuit ratio in one direction, and covers the last result after secondary simulation. The embodiment of the invention adds a storage function after the short circuit ratio module, records and stores the short circuit ratio at all times when the system operates, and provides data support for data statistics and subsequent processing. After the operation parameter set and the short circuit simulation result data set are obtained, the storage module stores each group of simulation operation parameters, the corresponding operation result and the short circuit ratio calculation result.
On the basis, in order to overcome the defect that the output of the traditional electromagnetic simulation model has limitation, the embodiment of the invention respectively analyzes and counts each group of parameters in the storage module and sorts out an input parameter reference table (described as a stable parameter range in the text) of a stable range of the new energy grid-connected system.
For clarity of further description, it will be exemplified that, in practical application, an electromagnetic simulation model of a new energy access system including a short ratio calculation element is constructed; setting input parameters, and providing data support for normal operation of the electromagnetic simulation model; performing electromagnetic simulation operation, and analyzing electromagnetic transient stability of new energy after grid connection through simulation results; triggering a short-circuit fault and measuring short-circuit current; calculating a short circuit ratio, and obtaining the short circuit ratio and the limit short circuit ratio of the system in a destabilization critical state through the result of electromagnetic simulation; storing the short circuit ratio calculation result and the simulation operation result, and providing data support for result analysis; and analyzing the result and counting an input parameter reference table of the stable range of the new energy grid-connected system.
In one embodiment, after the stable parameter range is obtained, output content can be checked according to the requirement of a user, input parameter reference tables of the stable range of the new energy grid-connected system are respectively displayed for short circuit ratio and limit short circuit ratio, and auxiliary decision is provided for parameter setting of the new energy grid-connected system.
The embodiment of the invention describes a grid-connected parameter setting auxiliary decision method, wherein a preset short-circuit ratio calculating element is added into a traditional electromagnetic simulation model, so that the system can calculate the short-circuit ratio and the limit short-circuit ratio during simulation operation, and the short-circuit ratio, the limit short-circuit ratio and a corresponding operation parameter set are stored and compared, so that a stable parameter range is determined to provide data support for auxiliary decision.
Second embodiment
Besides the method, the embodiment of the invention also discloses a grid-connected parameter setting auxiliary decision-making device. Fig. 2 is a schematic structural diagram of a grid-connected parameter setting auxiliary decision-making device according to an embodiment of the present invention.
As shown in fig. 2, the auxiliary decision device includes a model building unit 11, a simulation calculation unit 12, and an auxiliary decision unit 13.
The model construction unit 11 is configured to obtain a parameter to be decided, a main network operation parameter and a subnet operation parameter of a system to be decided, and construct an electromagnetic simulation model corresponding to the system to be decided according to the main network operation parameter and the subnet operation parameter.
The simulation calculation unit 12 is configured to obtain, according to the electromagnetic simulation model, an operation parameter set and a short-circuit simulation result data set of the electromagnetic simulation model through a preset short-circuit ratio calculation element and a preset three-phase short-circuit fault generator.
In one embodiment, the simulation calculation unit 12 is further configured to: when the electromagnetic simulation model is operated, triggering a preset three-phase short circuit fault generator, and determining a fault occurrence point; determining a corresponding element to be measured according to the fault occurrence point, and measuring the voltage and the current of the element to be measured; calculating the short circuit ratio and the limit short circuit ratio of the system to be decided according to a preset short circuit ratio calculation formula, the voltage and the current through preset short circuit ratio calculation software; storing the voltage and the current into an operation parameter group, and storing the short circuit ratio and the limit short circuit ratio into a short circuit simulation result data group.
In one embodiment, the simulation calculation unit 12 is further configured to: judging the type of the system to be decided and acquiring a preset short circuit ratio calculation formula; the short-circuit ratio calculation formula comprises a single-feed short-circuit ratio formula and a multi-feed short-circuit ratio formula; when the system to be decided is a single feeder system, respectively calculating a first short-circuit ratio of the system to be decided in a stable state and a first limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset single feed-in short-circuit ratio formula; and when the system to be decided is a multi-feeder system, respectively calculating a second short-circuit ratio of the system to be decided in a stable state and a second limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset multi-feed-in short-circuit ratio formula.
In one embodiment, the simulation calculation unit 12 is further configured to: judging the real-time stability state of the system to be decided according to the main network operation parameters and the sub-network operation parameters; when the system to be decided is in a stable state, calculating a first short circuit ratio of the system to be decided in the stable state according to the single feed-in short circuit ratio formula; when the system to be decided is in an unstable state, calculating a first limit short-circuit ratio of the system to be decided in the unstable state according to the single-feed short-circuit ratio formula.
In one embodiment, the simulation calculation unit 12 is further configured to: recording the first time when the voltage drop of the central point bus of the system is continuously lower than 0.75pu in transient and dynamic processes, and the voltage of the central point bus of 220kV and above voltage class after the dynamic processes subside; if the first time is not more than 1s and the bus voltage is not less than 0.9pu, judging that the system to be decided is in a stable state; otherwise, judging that the system to be decided is in an unstable state.
The auxiliary decision unit 13 is configured to obtain a stable parameter range of the system to be decided according to the running parameter set and the short circuit simulation result data set, and perform auxiliary decision of grid-connected parameter setting on the parameter to be decided according to the stable parameter range.
Wherein the decision-making aid 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 present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by instructing related hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each of the method embodiments described above when executed by a processor. Another embodiment of the present invention provides a computer readable storage medium, where the computer readable storage medium includes a stored computer program, where when the computer program runs, the device in which the computer readable storage medium is located is controlled to execute a front-end element adaptive display method as described above.
Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the units indicates that the units have communication connection, and the connection relation can be specifically realized as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The embodiment of the invention describes a grid-connected parameter setting auxiliary decision device and a computer readable storage medium, wherein a preset short-circuit ratio calculating element is added into a traditional electromagnetic simulation model, so that a system can calculate a short-circuit ratio and a limit short-circuit ratio during simulation operation, and the short-circuit ratio, the limit short-circuit ratio and a corresponding operation parameter set are stored and compared, so that a stable parameter range is determined to provide data support for auxiliary decision.
Detailed description of the preferred embodiments
In addition to the method and the device, the embodiment of the invention also describes a grid-connected parameter setting auxiliary decision-making system.
The grid-tie parameter setting aid decision system comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the grid-tie parameter setting aid decision method as described above when executing the computer program.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is the control center of the device, connecting the various parts of the overall device using various interfaces and lines.
The memory may be used to store the computer program and/or modules, and the processor may implement various functions of the apparatus by running or executing the computer program and/or modules stored in the memory, and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
The embodiment of the invention describes a grid-connected parameter setting auxiliary decision system, which adds a preset short-circuit ratio calculating element into a traditional electromagnetic simulation model, so that the system can calculate the short-circuit ratio and the limit short-circuit ratio during simulation operation, and stores and compares the short-circuit ratio, the limit short-circuit ratio and a corresponding operation parameter group, thereby determining a stable parameter range to provide data support for auxiliary decision.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (10)
1. The auxiliary decision-making method for grid-connected parameter setting is characterized by comprising the following steps of:
acquiring parameters to be decided, main network operation parameters and sub-network operation parameters of a system to be decided, and constructing an electromagnetic simulation model corresponding to the system to be decided according to the main network operation parameters and the sub-network operation parameters;
obtaining an operation parameter set and a short circuit simulation result data set of the electromagnetic simulation model according to the electromagnetic simulation model through a preset short circuit ratio calculation element and a preset three-phase short circuit fault generator;
and acquiring a stable parameter range of the system to be decided according to the operation parameter set and the short circuit simulation result data set, and performing auxiliary decision of grid-connected parameter setting on the parameter to be decided according to the stable parameter range.
2. The grid-connected parameter setting aid decision-making method according to claim 1, wherein the operation parameter set and the short-circuit simulation result data set of the electromagnetic simulation model are obtained according to the electromagnetic simulation model by a preset short-circuit ratio calculation element and a preset three-phase short-circuit fault generator, and specifically comprising:
when the electromagnetic simulation model is operated, triggering a preset three-phase short circuit fault generator, and determining a fault occurrence point;
determining a corresponding element to be measured according to the fault occurrence point, and measuring the voltage and the current of the element to be measured;
calculating the short circuit ratio and the limit short circuit ratio of the system to be decided according to a preset short circuit ratio calculation formula, the voltage and the current through preset short circuit ratio calculation software;
storing the voltage and the current into an operation parameter group, and storing the short circuit ratio and the limit short circuit ratio into a short circuit simulation result data group.
3. The grid-connected parameter setting auxiliary decision-making method according to claim 2, wherein calculating the short-circuit ratio and the limit short-circuit ratio of the system to be decided according to a preset short-circuit ratio calculation formula, the voltage and the current specifically comprises:
judging the type of the system to be decided and acquiring a preset short circuit ratio calculation formula; the short-circuit ratio calculation formula comprises a single-feed short-circuit ratio formula and a multi-feed short-circuit ratio formula;
when the system to be decided is a single feeder system, respectively calculating a first short-circuit ratio of the system to be decided in a stable state and a first limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset single feed-in short-circuit ratio formula;
and when the system to be decided is a multi-feeder system, respectively calculating a second short-circuit ratio of the system to be decided in a stable state and a second limit short-circuit ratio of the system to be decided in a destabilizing state according to the short-circuit capacity of the system to be decided, the energy rated capacity and a preset multi-feed-in short-circuit ratio formula.
4. The grid-tie parameter setting aid decision-making method according to claim 3, wherein the single feed short-circuit ratio formula is:
wherein S is ac For short-circuit capacity, p N Is the rated capacity of new energy.
5. The grid-tie parameter setting aid decision-making method according to claim 4, wherein the multi-feed short-circuit ratio formula is:
wherein SCR-Ui represents voltage support at i in grid connection, U N Which represents the voltage at the neutral point,
indicating the power applied by the ac system,
indicating the voltage variation of node i, U i Representing the node i voltage.
6. The grid-connected parameter setting aid decision-making method according to claim 5, wherein the calculating of the first short-circuit ratio of the system to be decided in the steady state and the first limit short-circuit ratio of the system to be decided in the unsteady state respectively includes:
judging the real-time stability state of the system to be decided according to the main network operation parameters and the sub-network operation parameters;
when the system to be decided is in a stable state, calculating a first short circuit ratio of the system to be decided in the stable state according to the single feed-in short circuit ratio formula;
when the system to be decided is in an unstable state, calculating a first limit short-circuit ratio of the system to be decided in the unstable state according to the single-feed short-circuit ratio formula.
7. The grid-connected parameter setting aid decision-making method according to claim 6, wherein the judging the real-time stability state of the system to be decided according to the main network operation parameter and the sub-network operation parameter specifically comprises:
recording the first time when the voltage drop of the central point bus of the system is continuously lower than 0.75pu in transient and dynamic processes, and the voltage of the central point bus of 220kV and above voltage class after the dynamic processes subside;
if the first time is not more than 1s and the bus voltage is not less than 0.9pu, judging that the system to be decided is in a stable state;
otherwise, judging that the system to be decided is in an unstable state.
8. A grid-connected parameter setting auxiliary decision-making device is characterized by comprising a model construction unit, a simulation calculation unit and an auxiliary decision-making unit, wherein,
the model construction unit is used for acquiring parameters to be decided, main network operation parameters and sub-network operation parameters of a system to be decided, and constructing an electromagnetic simulation model corresponding to the system to be decided according to the main network operation parameters and the sub-network operation parameters;
the simulation calculation unit is used for obtaining an operation parameter set and a short circuit simulation result data set of the electromagnetic simulation model according to the electromagnetic simulation model through a preset short circuit ratio calculation element and a preset three-phase short circuit fault generator;
the auxiliary decision unit is used for acquiring a stable parameter range of the system to be decided according to the operation parameter set and the short circuit simulation result data set, and carrying out auxiliary decision of grid-connected parameter setting on the parameter to be decided according to the stable parameter range.
9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform the grid-tie parameter setting aid decision method according to any one of claims 1 to 7.
10. Grid tie parameter setting aid decision system comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the grid tie parameter setting aid decision method according to any of claims 1 to 7 when the computer program is executed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310006341.9A CN116111644A (en) | 2023-01-04 | 2023-01-04 | Grid-connected parameter setting auxiliary decision-making method, device, storage medium and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310006341.9A CN116111644A (en) | 2023-01-04 | 2023-01-04 | Grid-connected parameter setting auxiliary decision-making method, device, storage medium and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116111644A true CN116111644A (en) | 2023-05-12 |
Family
ID=86266840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310006341.9A Pending CN116111644A (en) | 2023-01-04 | 2023-01-04 | Grid-connected parameter setting auxiliary decision-making method, device, storage medium and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116111644A (en) |
-
2023
- 2023-01-04 CN CN202310006341.9A patent/CN116111644A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111913145B (en) | Method and device for testing measurement deviation of electronic transformer measurement system | |
| CN109586272B (en) | Method and system for generating power grid continuous operation simulation section | |
| CN110212548B (en) | Configuration method and device of STATCOM (static synchronous compensator) of multi-DC feed-in receiving end system | |
| CN109659934B (en) | New energy grid-connected planning optimization method based on short-circuit current margin | |
| CN112766783B (en) | Method and system for evaluating operation quality of power equipment, terminal equipment and medium | |
| CN114336634A (en) | Load flow calculation method, device and equipment of power grid system | |
| CN116488267B (en) | Modeling-based wind farm reactive capacity limit simulation calculation method and device | |
| CN109376392B (en) | Overvoltage calculation method and system for series compensation device | |
| CN110445119B (en) | Multi-direct-current cooperative stability control method, device and equipment | |
| CN116111644A (en) | Grid-connected parameter setting auxiliary decision-making method, device, storage medium and system | |
| CN111679235A (en) | Real-time simulation test method and device for electromagnetic transformer measuring system | |
| Parihar et al. | Power flow analysis of balanced radial distribution system with composite load model | |
| KR100543543B1 (en) | An implementation method of training system applied the power system restorative training algorithm | |
| CN115940157A (en) | Method, device and equipment for automatically generating load flow scene of stability control strategy checking task | |
| CN114942361A (en) | Low-voltage distribution line operation parameter monitoring method and system | |
| CN111737875B (en) | Active power unbalance rate analysis and diagnosis method, system and computer equipment | |
| CN109088413B (en) | Dynamic reactive power planning and site selection method and device for direct-current receiving-end power grid | |
| CN114123164B (en) | Method and device for calculating short-circuit capacity of power system and terminal equipment | |
| Bian et al. | Identification and improvement of probabilistic voltage instability modes of power system with wind power integration | |
| CN112564134A (en) | Method, device, equipment and medium for configuring primary frequency modulation reserve capacity of power grid | |
| CN105429143A (en) | Harmonic quality monitor point address selecting method for special photovoltaic line of power system | |
| CN112217220B (en) | Safety and stability defense method and device for new energy source sending multi-terminal flexible direct current power grid | |
| CN113437763B (en) | Method and system for determining limit access scale and short-circuit capacity of new energy station | |
| Pielahn et al. | Modeling solar converters for harmonic and resonance studies | |
| CN112928773B (en) | Method and system for quantifying maximum access scale of new energy |
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 |