CN111157794A - Method and system for quickly calculating harmonic impedance of flexible direct current transmission system - Google Patents
Method and system for quickly calculating harmonic impedance of flexible direct current transmission system Download PDFInfo
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- CN111157794A CN111157794A CN202010059400.5A CN202010059400A CN111157794A CN 111157794 A CN111157794 A CN 111157794A CN 202010059400 A CN202010059400 A CN 202010059400A CN 111157794 A CN111157794 A CN 111157794A
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Abstract
The invention discloses a method and a system for quickly calculating harmonic impedance of a flexible direct current transmission system, which comprises the steps of obtaining current data of alternating current side tide of a converter valve and parameters of converter valve equipment; converting the data format of converter valve alternating current side tidal stream data and converter valve equipment parameters to obtain data in a readable format; performing steady-state harmonic calculation on the data in the readable format, and constructing an MMC type flexible direct-current power transmission system steady-state model by using a bridge arm average model; carrying out harmonic impedance calculation on the stable state model of the MMC type flexible direct current power transmission system to obtain a harmonic impedance model of the flexible direct current power transmission system and generate a harmonic impedance data table; and generating a harmonic impedance data visualization file based on the harmonic impedance data table, and generating a corresponding harmonic impedance amplitude-frequency characteristic image and a corresponding harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system. The invention has the beneficial effects that: and quickly calculating the harmonic impedance of the flexible direct-current transmission system under different frequencies.
Description
Technical Field
The invention relates to the field of flexible direct current transmission, in particular to a method and a system for quickly calculating harmonic impedance of a flexible direct current transmission system.
Background
Direct current system harmonics are one of the issues of great concern in the field of high voltage direct current transmission research. Because power electronic equipment such as a converter valve has the characteristic of nonlinearity, the phenomenon of significant harmonic transmission exists on the two sides of alternating current and direct current, and the harmonic impedance characteristic of a direct current system is very complex. In practical engineering, a harmonic impedance scanning system is mostly adopted to analyze the harmonic impedance characteristics of a direct current system, and the harmonic impedance scanning system is used as a parameter for configuring equipment.
The existing harmonic impedance scanning system of the flexible direct current transmission system generally adopts a signal injection method and can be divided into three steps. First, a harmonic current with frequency fn is injected at the measurement point. And after the system is stable, measuring the harmonic voltage variation of the system response. And finally, calculating the harmonic impedance value with the frequency of fn according to the measurement result. When it is desired to measure the harmonic impedance of multiple frequencies, the frequency fn of the injected signal is modified and the three steps are repeated. The method obtains discrete data points, and needs to process the measured data, such as plotting the harmonic impedance characteristic of the dc system by curve fitting, in order to obtain the desired harmonic impedance characteristic of the system.
However, in order to obtain the harmonic impedance characteristic of the dc system in the target frequency band, the impedance scanning method for the flexible dc transmission system needs to perform measurement for multiple times in the frequency band, and then process the measurement data. The wider the frequency band to be measured, the corresponding increase in the number of measurements will occur. Meanwhile, if the requirement on the accuracy of the finally obtained system harmonic impedance characteristic is high, the measurement times are correspondingly increased. In addition, after the parameters of the injected harmonic source are changed each time, the data sampling can be performed after the system is stabilized. This procedure takes a certain amount of time, which directly results in a tedious scanning process and a long time.
Disclosure of Invention
Aiming at the problems, the invention provides a method and a system for quickly calculating harmonic impedance of a flexible direct current transmission system, which mainly solve the problems of complicated scanning process and long time consumption of the existing impedance scanning method of the flexible direct current transmission system.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the method for quickly calculating the harmonic impedance of the flexible direct current transmission system comprises the following steps:
acquiring alternating current side tidal stream data of the converter valve and converter valve equipment parameters;
converting the data format of converter valve alternating current side tidal stream data and converter valve equipment parameters to obtain data in a readable format;
performing steady-state harmonic calculation on the data in the readable format, and constructing an MMC type flexible direct-current power transmission system steady-state model by using a bridge arm average model;
carrying out harmonic impedance calculation on the stable state model of the MMC type flexible direct current power transmission system to obtain a harmonic impedance model of the flexible direct current power transmission system and generate a harmonic impedance data table;
and generating a harmonic impedance data visualization file based on the harmonic impedance data table, and generating a corresponding harmonic impedance amplitude-frequency characteristic image and a corresponding harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system.
The matched system discloses a fast calculation system for harmonic impedance of a flexible direct current transmission system, which comprises:
the power grid parameter acquisition module is used for acquiring alternating current side tidal current data of the converter valve and converter valve equipment parameters;
the data format conversion module is used for carrying out data format conversion on the converter valve alternating current side tidal stream data and the converter valve equipment parameters to obtain data in a readable format;
the steady-state harmonic calculation module is used for performing steady-state harmonic calculation on the data in the readable format and constructing an MMC type flexible direct-current power transmission system steady-state model by utilizing a bridge arm average model;
the flexible direct current power transmission system harmonic impedance calculation module is used for calculating the harmonic impedance of the flexible direct current power transmission system on the MMC type flexible direct current power transmission system steady-state model to obtain a flexible direct current power transmission system harmonic impedance model and generate a harmonic impedance data table;
and the data analysis module generates a harmonic impedance data visualization file according to the harmonic impedance data table, and generates a corresponding harmonic impedance amplitude-frequency characteristic image of the flexible direct current power transmission system and a corresponding harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system.
Also discloses a device for quickly calculating harmonic impedance of a flexible direct current transmission system, which comprises a memory and a processor, wherein,
the memory is used for storing executable program codes;
the processor is coupled with the memory;
and the processor calls the executable program codes stored in the memory to execute the method for quickly calculating the harmonic impedance of the flexible direct current power transmission system.
The computer storage medium stores computer instructions, and when the computer instructions are called, the method is used for quickly calculating the harmonic impedance of the flexible direct current power transmission system.
The invention has the beneficial effects that:
1. the harmonic wave linear harmonic wave impedance calculation method is based on the harmonic wave linear principle, the equivalent impedance model of the flexible direct current transmission system is constructed, and the harmonic wave impedance of the flexible direct current transmission system under different frequencies is calculated rapidly. The system has simple measurement links, and can obtain the harmonic impedance characteristic of the direct current system in a specified frequency range only by inputting/passively acquiring two groups of data, namely 'tidal current data on the alternating current side of the converter valve' and 'equipment parameters of the converter valve', by a user. The problems that the traditional signal testing method needs to change the testing parameters repeatedly and the calculation time is too long are solved.
2. According to the method, a harmonic source is not required to be injected into the system, repeated data sampling is not required to be carried out on the system, and the harmonic impedance data table in the specified frequency range can be generated by taking 1Hz as the frequency interval of data points. Errors caused by improper harmonic source parameter selection and measurement links are avoided.
3. The invention outputs the calculation result in the form of excel file named as 'harmonic impedance data'. And simultaneously, automatically generating a format image of 'harmonic impedance amplitude-frequency characteristic of the flexible direct current transmission system' and 'harmonic impedance phase-frequency characteristic of the flexible direct current transmission system' jpg or png. Compared with the traditional measurement method, the method can directly obtain the expected harmonic impedance characteristic curve of the flexible direct current transmission system without analyzing and fitting the discrete data by a user.
Drawings
Fig. 1 is a flowchart of a method for quickly calculating harmonic impedance of a flexible direct-current power transmission system according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a system for rapidly calculating harmonic impedance of a flexible direct-current power transmission system according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the following detailed description of the present invention is provided with reference to the accompanying drawings and detailed description. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
Example one
As shown in fig. 1, the present embodiment provides a method for quickly calculating harmonic impedance of a flexible direct current transmission system, including the following steps:
s1, acquiring tidal stream data of the alternating current side of the converter valve and converter valve equipment parameters; the alternating-current side power flow data of the converter valve comprises valve side alternating current, valve side alternating voltage and network side alternating voltage.
The valve side ac current, valve side ac voltage, and net side ac voltage are stored in txt text format. The rated alternating voltage, the rated direct voltage, the rated capacity, the PI parameter of the controller, the capacitance parameter, the converter transformer parameter, the direct current line parameter and the frequency range of the converter valve are stored in an excel format.
S2, converting the data format of the converter valve alternating current side tide flow data and the converter valve equipment parameters to obtain data with a readable format; the converter valve equipment parameters comprise a converter valve rated alternating voltage, a converter valve rated direct voltage, a converter valve rated capacity, a controller PI parameter, a capacitor parameter, a converter transformer parameter, a direct current line parameter and a frequency range.
S3, performing steady-state harmonic calculation on the data in the readable format, and constructing an MMC type flexible direct-current power transmission system steady-state model by using a bridge arm average model;
s4, carrying out harmonic impedance calculation on the stable state model of the MMC type flexible direct current power transmission system to obtain a harmonic impedance model of the flexible direct current power transmission system and generate a harmonic impedance data table; the harmonic impedance calculation of the flexible direct current transmission system specifically comprises the following steps: based on a harmonic linearization principle, an MMC type flexible direct current power transmission system steady-state model is used as an input parameter, a flexible direct current power transmission system harmonic impedance model considering bridge arm multi-harmonic coupling is constructed, 1Hz is used as a frequency interval of different data points, and a harmonic impedance data table in a specified frequency range is generated.
And S5, generating a harmonic impedance data visualization file based on the harmonic impedance data table, and generating a corresponding harmonic impedance amplitude-frequency characteristic image and a corresponding harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system. The harmonic impedance data visualization file is stored in an excel format, and the harmonic impedance amplitude-frequency characteristic image of the flexible direct current power transmission system and the harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system are stored in a jpg or png format.
The harmonic wave linear harmonic wave impedance calculation method is based on the harmonic wave linear principle, the equivalent impedance model of the flexible direct current transmission system is constructed, and the harmonic wave impedance of the flexible direct current transmission system under different frequencies is calculated rapidly. The system has simple measurement links, and can obtain the harmonic impedance characteristic of the direct current system in a specified frequency range only by inputting/passively acquiring two groups of data, namely 'tidal current data on the alternating current side of the converter valve' and 'equipment parameters of the converter valve', by a user. The problems that the traditional signal testing method needs to change the testing parameters repeatedly and the calculation time is too long are solved.
Different from the prior art, the harmonic impedance data table in the appointed frequency range can be generated by taking 1Hz as the frequency interval of the data point without injecting a harmonic source into the system and repeatedly sampling data of the system. Errors caused by improper harmonic source parameter selection and measurement links are avoided.
And outputting the calculation result in an excel file named as 'harmonic impedance data'. And simultaneously, automatically generating a format image of 'harmonic impedance amplitude-frequency characteristic of the flexible direct current transmission system' and 'harmonic impedance phase-frequency characteristic of the flexible direct current transmission system' jpg or png. Compared with the traditional measurement method, the method can directly obtain the expected harmonic impedance characteristic curve of the flexible direct current transmission system without analyzing and fitting the discrete data by a user.
Example two
As shown in fig. 2, a fast calculation system for harmonic impedance of a flexible direct current transmission system includes:
the power grid parameter acquisition module is used for acquiring alternating current side tidal current data of the converter valve and converter valve equipment parameters;
the data format conversion module is used for carrying out data format conversion on the converter valve alternating current side tidal stream data and the converter valve equipment parameters to obtain data in a readable format;
the steady-state harmonic calculation module is used for performing steady-state harmonic calculation on the data in the readable format and constructing an MMC type flexible direct-current power transmission system steady-state model by utilizing a bridge arm average model;
the flexible direct current power transmission system harmonic impedance calculation module is used for calculating the harmonic impedance of the flexible direct current power transmission system on the MMC type flexible direct current power transmission system steady-state model to obtain a flexible direct current power transmission system harmonic impedance model and generate a harmonic impedance data table;
and the data analysis module generates a harmonic impedance data visualization file according to the harmonic impedance data table, and generates a corresponding harmonic impedance amplitude-frequency characteristic image of the flexible direct current power transmission system and a corresponding harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system.
Furthermore, the converter valve ac-side power flow data acquired by the grid parameter acquisition module includes a valve-side ac current, a valve-side ac voltage, and a grid-side ac voltage, and the converter valve device parameters acquired by the grid parameter acquisition module include a converter valve rated ac voltage, a rated dc voltage, a rated capacity, a controller PI parameter, a capacitance parameter, a converter transformer parameter, a dc line parameter, and a frequency range.
In some embodiments, the valve side ac current, the valve side ac voltage, and the grid side ac voltage are stored in txt text format. The rated alternating voltage, the rated direct voltage, the rated capacity, the PI parameter of the controller, the capacitance parameter, the converter transformer parameter, the direct current line parameter and the frequency range of the converter valve are stored in an excel format. Of course, the storage may be in some other visualization/operational format, and is not limited to the several storage formats listed.
In some embodiments, the flexible direct current transmission system harmonic impedance calculation is specifically: based on a harmonic linearization principle, an MMC type flexible direct current power transmission system steady-state model is used as an input parameter, a flexible direct current power transmission system harmonic impedance model considering bridge arm multi-harmonic coupling is constructed, 1Hz is used as a frequency interval of different data points, and a harmonic impedance data table in a specified frequency range is generated.
In some embodiments, the harmonic impedance data visualization file is stored in an excel format, and the harmonic impedance amplitude-frequency characteristic image of the flexible direct current power transmission system and the harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system are stored in a jpg or png format.
EXAMPLE III
The embodiment provides a fast calculation device for harmonic impedance of a flexible direct current transmission system, which comprises a memory and a processor, wherein,
the memory is used for storing executable program codes;
a processor coupled with the memory;
the processor calls the executable program codes stored in the memory to execute the method for quickly calculating the harmonic impedance of the flexible direct current power transmission system described in the first embodiment.
Example four
The embodiment of the invention discloses a computer-readable storage medium which stores a computer program for electronic data exchange, wherein the computer program enables a computer to execute the steps in the method for quickly calculating the harmonic impedance of a flexible direct current power transmission system described in the first embodiment.
The above-described embodiments of the system and apparatus are only schematic, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above detailed description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. Based on such understanding, the above technical solutions may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, wherein the storage medium includes a Read-Only Memory (ROM), a Random Access Memory (RAM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an Electrically Erasable rewritable Read-Only Memory (EEPROM), a compact disc-Read-Only Memory (CD-ROM) or other magnetic disk memories, a magnetic tape Memory, a magnetic disk, a magnetic tape Memory, a magnetic tape, and a magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
Finally, it should be noted that: the method and system for fast calculating harmonic impedance of a flexible direct current transmission system disclosed in the embodiments of the present invention are only preferred embodiments of the present invention, and are only used for illustrating the technical solutions of the present invention, not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A method for quickly calculating harmonic impedance of a flexible direct current transmission system is characterized by comprising the following steps:
acquiring alternating current side tidal stream data of the converter valve and converter valve equipment parameters;
converting the data format of the converter valve alternating current side tide flow data and the converter valve equipment parameters to obtain data in a readable format;
performing steady-state harmonic calculation on the data with the readable format, and constructing an MMC type flexible direct-current power transmission system steady-state model by using a bridge arm average model;
carrying out harmonic impedance calculation on the MMC type flexible direct current power transmission system steady-state model to obtain a flexible direct current power transmission system harmonic impedance model and generate a harmonic impedance data table;
and generating a harmonic impedance data visualization file based on the harmonic impedance data table, and generating a corresponding harmonic impedance amplitude-frequency characteristic image of the flexible direct current power transmission system and a corresponding harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system.
2. The method of fast calculation of harmonic impedance of a flexible direct current transmission system according to claim 1, characterized in that the converter valve alternating current side power flow data comprises valve side alternating current, valve side alternating voltage and grid side alternating voltage.
3. The method of fast calculation of harmonic impedance of a flexible direct current transmission system according to claim 1, characterized in that said converter valve equipment parameters comprise converter valve rated alternating voltage, rated direct voltage, rated capacity, controller PI parameters, capacitance parameters, converter transformer parameters, direct current line parameters and frequency range.
4. The flexible direct current transmission system harmonic impedance fast calculation method according to claim 2, characterized in that the valve side alternating current, the valve side alternating voltage and the grid side alternating voltage are stored in a text format of txt.
5. The method of claim 3, wherein the converter valve rated AC voltage, rated DC voltage, rated capacity, controller PI parameters, capacitance parameters, converter transformer parameters, DC line parameters, and frequency ranges are stored in an excel format.
6. The method according to claim 1, wherein the harmonic impedance of the flexible direct current transmission system is calculated by: based on a harmonic linearization principle, the MMC type flexible direct current power transmission system steady-state model is used as an input parameter, a flexible direct current power transmission system harmonic impedance model considering bridge arm multi-harmonic coupling is constructed, and a harmonic impedance data table in a specified frequency range is generated by using 1Hz as a frequency interval of different data points.
7. The method for rapidly calculating the harmonic impedance of the flexible direct current transmission system according to claim 1, wherein the harmonic impedance data visualization file is stored in an excel format, and the harmonic impedance amplitude-frequency characteristic image of the flexible direct current transmission system and the harmonic impedance phase-frequency characteristic image of the flexible direct current transmission system are stored in a jpg or png format.
8. A fast calculation system for harmonic impedance of a flexible direct current transmission system is characterized by comprising:
the power grid parameter acquisition module is used for acquiring alternating current side tidal current data of the converter valve and converter valve equipment parameters;
the data format conversion module is used for carrying out data format conversion on the converter valve alternating current side tidal stream data and the converter valve equipment parameters to obtain data in a readable format;
the steady-state harmonic calculation module is used for performing steady-state harmonic calculation on the data in the readable format and constructing an MMC flexible direct-current power transmission system steady-state model by utilizing a bridge arm average model;
the flexible direct current power transmission system harmonic impedance calculation module is used for calculating the harmonic impedance of the flexible direct current power transmission system on the MMC type flexible direct current power transmission system steady-state model to obtain a flexible direct current power transmission system harmonic impedance model and generate a harmonic impedance data table;
and the data analysis module generates a harmonic impedance data visualization file according to the harmonic impedance data table, and generates a corresponding harmonic impedance amplitude-frequency characteristic image of the flexible direct current power transmission system and a corresponding harmonic impedance phase-frequency characteristic image of the flexible direct current power transmission system.
9. A fast calculation device for harmonic impedance of a flexible direct current transmission system is characterized by comprising a memory and a processor, wherein,
the memory is used for storing executable program codes;
the processor is coupled with the memory;
the processor calls the executable program code stored in the memory to execute the flexible direct current transmission system harmonic impedance fast calculation method according to any one of claims 1 to 7.
10. A computer-storable medium storing computer instructions for performing a fast calculation method of harmonic impedance of a flexible direct current power transmission system according to any one of claims 1-7 when being called.
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| CN113189532A (en) * | 2021-04-23 | 2021-07-30 | 国家电网有限公司 | Method and device for online correction of harmonic measurement error of capacitor voltage transformer |
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