CN115622063A - Photovoltaic power station harmonic analysis and treatment method and system under new energy power grid - Google Patents
Photovoltaic power station harmonic analysis and treatment method and system under new energy power grid Download PDFInfo
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- 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
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- 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
- H02J3/381—Dispersed generators
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- 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
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- H—ELECTRICITY
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- 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
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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Abstract
The invention discloses a method and a system for analyzing and managing harmonic waves of a photovoltaic power station under a new energy power grid, wherein a photovoltaic power station and a superior regional power grid model are established according to equipment, lines, structures, harmonic wave data and superior power grid data of the photovoltaic power station; acquiring a power grid bus of a superior region and a background harmonic of a photovoltaic power station inverter, and establishing a photovoltaic power station harmonic model according to the background harmonic; calculating the content rate of harmonic waves output by the harmonic waves of the photovoltaic power station at harmonic examination points of the photovoltaic power station and a bus of a superior regional power grid according to the harmonic wave model of the photovoltaic power station; and superposing the background harmonic of the bus harmonic evaluation point of the upper-level regional power grid and the output harmonic of the photovoltaic power station to obtain the final harmonic content of the evaluation point, and filtering the harmonic of the evaluation point to obtain the harmonic content of the photovoltaic power station and the upper-level regional power grid after the evaluation point is treated. And the harmonic analysis and treatment of the photovoltaic power station are effectively realized.
Description
Technical Field
The invention relates to the technical field of photovoltaic power station harmonic analysis and treatment, in particular to a photovoltaic power station harmonic analysis and treatment method and system under a new energy power grid.
Background
With the large-scale development and utilization of new energy mainly comprising wind energy and solar energy and the rapid development of a novel power system, a large amount of power electronic equipment such as a current converter and an inverter is introduced into the power system, the characteristics of the power grid gradually evolve towards high permeability, high power electronization and the like, a high-proportion photovoltaic power station is connected into the power grid, and the harmonic problem caused to the power grid is fundamentally changed compared with the traditional power grid.
Harmonic waves in the new energy power grid can affect normal operation of various power equipment, so that the method has important significance for analyzing the harmonic wave problem of the photovoltaic power station and treating the output harmonic waves of the photovoltaic power station.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the invention provides a photovoltaic power station harmonic analysis and treatment method and system under a new energy power grid, and the problem of how to effectively treat to improve the consumption rate of renewable distributed energy sources can be solved.
In order to solve the technical problem, the invention provides the following technical scheme, and the method for analyzing and managing the harmonic waves of the photovoltaic power station under the new energy power grid comprises the following steps:
establishing a photovoltaic power station and an upper-level regional power grid model according to equipment, lines, structures, harmonic data and upper-level power grid data of the photovoltaic power station;
acquiring a power grid bus of a superior region and a background harmonic of a photovoltaic power station inverter, and establishing a photovoltaic power station harmonic model according to the background harmonic;
calculating the content rate of harmonic waves output by the harmonic waves of the photovoltaic power station at harmonic examination points of the photovoltaic power station and a bus of a superior regional power grid according to the harmonic wave model of the photovoltaic power station;
and superposing the background harmonic of the bus harmonic evaluation point of the upper-level regional power grid and the output harmonic of the photovoltaic power station to obtain the final harmonic content of the evaluation point, and filtering the harmonic of the evaluation point to obtain the harmonic content of the photovoltaic power station and the upper-level regional power grid after the evaluation point is treated.
The invention relates to a preferable scheme of a photovoltaic power station harmonic analysis and treatment method under a new energy power grid, wherein the method comprises the following steps: the final harmonic content of the evaluation point comprises,
the background harmonic of the higher-level power grid examination point and the harmonic of the same order of the output harmonic of the photovoltaic power station are superposed in the following way:
wherein, I h1 Is the h-th harmonic current, I, of the harmonic source 1 h2 Is the h-th harmonic current of the harmonic source 2 and theta is the phase angle between the h-th harmonic currents of the harmonic source 1 and the harmonic source 2.
The invention relates to a preferable scheme of a photovoltaic power station harmonic analysis and treatment method under a new energy power grid, wherein the method comprises the following steps: the final harmonic content of the evaluation point further includes,
when the phase angle is uncertain, the final harmonic content is as follows:
and K is a coefficient corresponding to different harmonic times.
The invention relates to a preferable scheme of a photovoltaic power station harmonic analysis and treatment method under a new energy power grid, wherein the method comprises the following steps: the coefficients corresponding to the different harmonic orders include,
when the harmonic times are three times, the coefficient K corresponding to different harmonic times is 1.62;
when the harmonic times are five, the coefficient K corresponding to different harmonic times is 1.28;
when the harmonic frequency is seven, the coefficient K corresponding to different harmonic frequencies is 0.72;
when the harmonic frequency is eleven, taking the coefficient K corresponding to different harmonic frequencies as 0.18;
when the harmonic times are thirteen times, the coefficient K corresponding to different harmonic times is 0.08;
and when the harmonic frequency is nine or even, taking 0 as the coefficient K corresponding to different harmonic frequencies.
As a preferred scheme of the photovoltaic power station harmonic analysis and treatment method under the new energy power grid, the method comprises the following steps: the photovoltaic power station and the upper-level regional power grid model comprise a power model and a harmonic model,
the power model comprises a photovoltaic power station power equivalent model, the photovoltaic power station power equivalent model comprises a photovoltaic system and a boosting grid-connected system, the photovoltaic system is formed by connecting a solar photovoltaic module with an inverter, and battery parameters and control parameters are determined by actual photovoltaic power station values;
the boosting grid-connected system achieves classification grid connection according to an inverter grid-connected control strategy, wherein parameters of a transformer are consistent with parameters of a transformer of a boosting station of a photovoltaic power station.
The invention relates to a preferable scheme of a photovoltaic power station harmonic analysis and treatment method under a new energy power grid, wherein the method comprises the following steps: the background harmonic waves of the upper-level regional power grid bus and the photovoltaic power station inverter comprise,
before the photovoltaic power station is not accessed, harmonic voltage is obtained by carrying out harmonic test on a transformer substation and a power plant of a photovoltaic power station access point, and the measured harmonic voltage is used as bus background harmonic;
when the photovoltaic power station is not accessed, the measured harmonic voltage is harmonic waves output by the photovoltaic power station, the inverter harmonic waves are harmonic current content of the photovoltaic inverters under 100% operation, a harmonic source model of the harmonic current content of the photovoltaic inverters under 100% output is superposed on each inverter, and a harmonic model of the photovoltaic power station is established.
The invention relates to a preferable scheme of a photovoltaic power station harmonic analysis and treatment method under a new energy power grid, wherein the method comprises the following steps: the filtering includes the steps of, in response to the filtering,
after the evaluation point harmonic wave is obtained, filtering is carried out on the overproof harmonic wave when the evaluation point harmonic wave is configured by adopting an SVG method, and the evaluation point harmonic wave content is calculated after the SVG is configured;
if the harmonic wave exceeds the standard and is below the third harmonic wave, the SVG configuration filtering parameter and the placement position are changed, and reactive power capable of offsetting the first harmonic wave, the second harmonic wave and the third harmonic wave is emitted until the harmonic wave content rate is qualified;
if the harmonic wave exceeds the standard and is the harmonic wave above the third harmonic wave, the SVG configuration filtering parameter and the placement position are changed, reactive power capable of offsetting the first harmonic wave, the second harmonic wave and the third harmonic wave is emitted, and the reactive power above the third harmonic wave is absorbed until the harmonic wave content rate is qualified.
The invention relates to a preferable scheme of a photovoltaic power station harmonic analysis and treatment method under a new energy power grid, wherein the method comprises the following steps: the utility model provides a photovoltaic power plant harmonic analysis and treatment system under new forms of energy electric wire netting which characterized in that: comprises a power grid model establishing module, a harmonic model establishing module, a calculating module and a filtering module,
the power grid model building module builds a photovoltaic power station and a superior regional power grid model according to the size, the circuit, the structure, the power and harmonic data of the photovoltaic power station;
the harmonic model building module is used for obtaining a power grid bus of a superior region and background harmonic of a photovoltaic power station inverter and building a photovoltaic power station harmonic model according to the background harmonic;
the calculation module is used for calculating the content rate of harmonic waves output by the photovoltaic power station in the photovoltaic power station and the higher-level regional power grid bus harmonic wave examination points according to the photovoltaic power station harmonic wave model;
and the filtering module is used for superposing the bus harmonic evaluation point background harmonic of the upper-level regional power grid of the filtering module and the output harmonic of the photovoltaic power station to obtain the final harmonic content rate of the evaluation point, filtering the harmonic of the evaluation point to obtain the harmonic content rate of the photovoltaic power station and the upper-level regional power grid after the evaluation point is treated.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method as described above when executing the computer program.
A computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the steps of the method as set forth above.
The invention has the beneficial effects that: the invention provides a photovoltaic power station harmonic analysis and treatment method and a photovoltaic power station harmonic analysis and treatment system under a new energy power grid, which are used for analyzing the harmonic interaction between the new energy power grid and a photovoltaic power station and realizing the effective treatment of photovoltaic power station harmonics under the new energy power grid.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor. Wherein:
fig. 1 is a method flowchart of a photovoltaic power plant harmonic analysis and governance method and system under a new energy power grid according to an embodiment of the present invention;
fig. 2 is a photovoltaic power plant model diagram of a photovoltaic power plant harmonic analysis and governance method and system under a new energy power grid according to an embodiment of the present invention;
fig. 3 is an internal structural diagram of a computer device of a photovoltaic power plant harmonic analysis and governance method and system in a new energy power grid according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 3, a first embodiment of the present invention provides a method and a system for analyzing and managing harmonics of a photovoltaic power plant in a new energy power grid, including:
102, establishing a photovoltaic power station and a superior regional power grid model according to equipment, lines, structures, harmonic data and superior power grid data of the photovoltaic power station;
the DIGSILENT models of the photovoltaic power station and the upper-level regional power grid are divided into a power model and a harmonic model, and the power model and the harmonic model are shown in FIG. 3.
Specifically, a power model of a photovoltaic power station and a superior regional power grid is established, the power equivalent model of the photovoltaic power station comprises a photovoltaic system and a boosting grid-connected system, and the photovoltaic system is formed by connecting a solar photovoltaic module with an inverter;
furthermore, the photovoltaic system model is modeled by a general photovoltaic system model in DIGSILENT, an inverter grid-connected control strategy has a plurality of control strategies to realize grid connection, a photovoltaic power station inverter is generally connected to the grid by adopting a constant power factor control mode under MPPT, the photovoltaic power factor is 1.0, other photovoltaic battery parameters and inverter control parameters are consistent with those of an actual photovoltaic power station, a boosting grid-connected system is the same as that of a traditional transformer substation, the DIGSILENT is modeled by a transformer, the transformer parameters of a boosting station of the photovoltaic power station of the transformer are consistent, a higher-level regional power grid model is modeled according to a power grid framework of the photovoltaic power station incorporated into a regional power grid, and the higher-level regional power grid comprises a power plant and a transformer substation in the region.
104, acquiring background harmonic waves of a power grid bus and a photovoltaic power station inverter of a higher-level region, and establishing a photovoltaic power station harmonic wave model according to the background harmonic waves;
the bus background harmonic waves to be evaluated by the power plant and the transformer substation refer to harmonic voltage and the like obtained by performing harmonic wave test on the transformer substation and the power plant of a photovoltaic power station access point before the photovoltaic power station is accessed, and the test harmonic waves do not include harmonic waves output by the photovoltaic power station.
Specifically, the background harmonic waves of the upper-level regional power grid bus and the photovoltaic power station inverter comprise harmonic wave voltages obtained by carrying out harmonic wave tests on a transformer substation and a power plant of a photovoltaic power station access point before the photovoltaic power station is accessed, and the measured harmonic wave voltages are used as bus background harmonic waves;
furthermore, when the photovoltaic power station is not accessed, the measured harmonic voltage is harmonic waves output by the photovoltaic power station, the inverter harmonic waves are harmonic current content of the photovoltaic inverters under 100% operation, a harmonic source model of the harmonic current content of the photovoltaic inverters under 100% output is superposed on each inverter, and a harmonic model of the photovoltaic power station is established.
106, calculating the content rate of harmonic waves output by the photovoltaic power station in the photovoltaic power station and the higher-level regional power grid bus harmonic wave evaluation points according to the photovoltaic power station harmonic wave model;
the photovoltaic power station and the upper-level regional power grid model comprise a power model and a harmonic model.
Specifically, the power model comprises a photovoltaic power station power equivalent model, the photovoltaic power station power equivalent model comprises a photovoltaic system and a boosting grid-connected system, the photovoltaic system is formed by connecting a solar photovoltaic assembly with an inverter, and battery parameters and control parameters are determined by actual photovoltaic power station values;
furthermore, the boosting grid-connected system realizes classification grid connection according to an inverter grid-connected control strategy, wherein parameters of the transformer are consistent with parameters of the transformer of the photovoltaic power station booster station.
And 108, superposing the bus harmonic evaluation point background harmonic of the higher-level regional power grid and the output harmonic of the photovoltaic power station to obtain the final harmonic content of the evaluation point, and filtering the harmonic of the evaluation point to obtain the harmonic content of the photovoltaic power station and the higher-level regional power grid after the evaluation point is subjected to treatment.
The final harmonic content of the examination evaluation point comprises the following steps that the background harmonic of the upper-level power grid examination evaluation point and the harmonic of the same order of the output harmonic of the photovoltaic power station are superposed in the following mode:
wherein, I h1 Is the h-th harmonic current, I, of the harmonic source 1 h2 Is the h-th harmonic current of the harmonic source 2 and theta is the phase angle between the h-th harmonic currents of the harmonic source 1 and the harmonic source 2.
The final harmonic content of the evaluation point further includes,
further, when the phase angle is uncertain, the final harmonic content is:
and K is a coefficient corresponding to different harmonic times.
It should be noted that the coefficients corresponding to the different harmonic orders include,
when the harmonic frequency is three, the coefficient K corresponding to different harmonic frequencies is 1.62;
when the harmonic times are five, the coefficient K corresponding to different harmonic times is 1.28;
when the harmonic times are seven, the coefficient K corresponding to different harmonic times is 0.72;
when the harmonic times are eleven, the coefficient K corresponding to different harmonic times is 0.18;
when the harmonic frequency is thirteen times, the coefficient K corresponding to different harmonic frequencies is 0.08;
and when the harmonic times are nine times or even times, the coefficients K corresponding to different harmonic times are 0.
It should be noted that the filtering includes, after acquiring the evaluation point harmonic, filtering the overproof harmonic when adopting an SVG method, and calculating the evaluation point harmonic content after configuring the SVG;
furthermore, if the harmonic wave exceeds the standard and is below the third harmonic wave, the SVG configuration filtering parameter and the placement position are changed, and reactive power capable of offsetting the first harmonic wave, the second harmonic wave and the third harmonic wave is emitted until the harmonic wave content rate is qualified;
furthermore, if the harmonic wave exceeds the standard and is more than three harmonic waves, the SVG configuration filtering parameter and the placement position are changed, reactive power capable of offsetting the first harmonic wave, the second harmonic wave and the third harmonic wave is emitted, and the reactive power more than the third harmonic wave is absorbed until the harmonic wave content rate is qualified.
The utility model provides a photovoltaic power plant harmonic analysis and treatment system under new forms of energy electric wire netting which characterized in that: comprises a power grid model building module, a harmonic model building module, a calculation module and a filtering module,
the power grid model building module builds a photovoltaic power station and a superior regional power grid model according to the size, the circuit, the structure, the power and harmonic data of the photovoltaic power station;
the harmonic model building module is used for obtaining a power grid bus of a higher-level region and background harmonic of a photovoltaic power station inverter and building a photovoltaic power station harmonic model according to the background harmonic;
the calculation module is used for calculating the content rate of harmonic waves output by the harmonic waves of the photovoltaic power station at harmonic examination points of the photovoltaic power station and a bus of a superior regional power grid according to the harmonic wave model of the photovoltaic power station;
and the filtering module is used for superposing the bus harmonic evaluation point background harmonic of the higher-level regional power grid and the output harmonic of the photovoltaic power station to obtain the final harmonic content of the evaluation point, and filtering the harmonic of the evaluation point to obtain the harmonic content of the photovoltaic power station and the higher-level regional power grid after the evaluation point is subjected to treatment. The above unit modules may be embedded in a hardware form or may be independent from a processor in the computer device, or may be stored in a memory in the computer device in a software form, so that the processor calls and executes operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 3. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for communicating with an external terminal in a wired or wireless manner, and the wireless manner can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to realize a photovoltaic power station harmonic analysis and treatment method under a new energy power grid. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
establishing a photovoltaic power station and an upper-level regional power grid model according to equipment, lines, structures, harmonic data and upper-level power grid data of the photovoltaic power station;
acquiring a power grid bus of a superior region and a background harmonic of a photovoltaic power station inverter, and establishing a photovoltaic power station harmonic model according to the background harmonic;
calculating the content rate of harmonic waves output by the photovoltaic power station in the photovoltaic power station and the higher-level regional power grid bus harmonic wave examination points according to the photovoltaic power station harmonic wave model;
and superposing the background harmonic of the bus harmonic evaluation point of the upper-level regional power grid and the output harmonic of the photovoltaic power station to obtain the final harmonic content of the evaluation point, and filtering the harmonic of the evaluation point to obtain the harmonic content of the photovoltaic power station and the upper-level regional power grid after the evaluation point is treated.
Example 2
Referring to fig. 1 to 3, in order to verify the beneficial effects of the invention, scientific demonstration is performed through comparative experiments.
TABLE 1 distinguishing features of the conventional technical means from the present application
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 so forth) having computer-usable program code embodied therein. The scheme in the embodiment of the application can be implemented by adopting various computer languages, such as object-oriented programming language Java and transliterated scripting language JavaScript.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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 the preferred embodiments of the present application 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 alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A photovoltaic power station harmonic analysis and treatment method under a new energy power grid is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
establishing a photovoltaic power station and an upper-level regional power grid model according to equipment, lines, structures, harmonic data and upper-level power grid data of the photovoltaic power station;
acquiring a power grid bus of a higher-level region and a background harmonic wave of a photovoltaic power station inverter, and establishing a photovoltaic power station harmonic wave model according to the background harmonic wave;
calculating the content rate of harmonic waves output by the harmonic waves of the photovoltaic power station at harmonic examination points of the photovoltaic power station and a bus of a superior regional power grid according to the harmonic wave model of the photovoltaic power station;
and superposing the background harmonic of the bus harmonic evaluation point of the upper-level regional power grid and the output harmonic of the photovoltaic power station to obtain the final harmonic content of the evaluation point, and filtering the harmonic of the evaluation point to obtain the harmonic content of the photovoltaic power station and the upper-level regional power grid after the evaluation point is treated.
2. The photovoltaic power station harmonic analysis and governance method under the new energy power grid as claimed in claim 1, wherein: the final harmonic content of the evaluation point includes,
the background harmonic of the higher-level power grid examination point and the harmonic of the same order of the output harmonic of the photovoltaic power station are superposed in the following way:
wherein, I h1 Is the h-th harmonic current, I, of the harmonic source 1 h2 Is the h-th harmonic current of the harmonic source 2 and theta is the phase angle between the h-th harmonic currents of the harmonic source 1 and the harmonic source 2.
3. The method for analyzing and governing the harmonic waves of the photovoltaic power station under the new energy power grid as claimed in claim 2, wherein: the final harmonic content of the evaluation point further includes,
when the phase angle is uncertain, the final harmonic content is as follows:
and K is a coefficient corresponding to different harmonic times.
4. The method for analyzing and governing the harmonic waves of the photovoltaic power station under the new energy power grid as claimed in claim 3, wherein: the coefficients corresponding to the different harmonic orders include,
when the harmonic frequency is three, the coefficient K corresponding to different harmonic frequencies is 1.62;
when the harmonic times are five, the coefficient K corresponding to different harmonic times is 1.28;
when the harmonic times are seven, the coefficient K corresponding to different harmonic times is 0.72;
when the harmonic frequency is eleven, taking the coefficient K corresponding to different harmonic frequencies as 0.18;
when the harmonic times are thirteen times, the coefficient K corresponding to different harmonic times is 0.08;
and when the harmonic times are nine times or even times, the coefficients K corresponding to different harmonic times are 0.
5. The photovoltaic power station harmonic analysis and governance method under the new energy power grid as claimed in claim 4, wherein: the photovoltaic power station and the upper-level regional power grid model comprise a power model and a harmonic model,
the power model comprises a photovoltaic power station power equivalent model, the photovoltaic power station power equivalent model comprises a photovoltaic system and a boosting grid-connected system, the photovoltaic system is formed by connecting a solar photovoltaic module with an inverter, and battery parameters and control parameters are determined by actual photovoltaic power station values;
the boosting grid-connected system achieves classification grid connection according to an inverter grid-connected control strategy, wherein parameters of a transformer are consistent with parameters of a transformer of a boosting station of a photovoltaic power station.
6. The method for analyzing and governing the harmonic waves of the photovoltaic power station under the new energy power grid as claimed in claim 5, wherein: the background harmonic waves of the upper-level regional power grid bus and the photovoltaic power station inverter comprise,
before the photovoltaic power station is not accessed, harmonic voltage is obtained by carrying out harmonic test on a transformer substation and a power plant of a photovoltaic power station access point, and the measured harmonic voltage is used as bus background harmonic;
when the photovoltaic power station is not accessed, the measured harmonic voltage is harmonic waves output by the photovoltaic power station, the inverter harmonic waves are harmonic current content of the photovoltaic inverters under 100% operation, a harmonic source model of the harmonic current content of the photovoltaic inverters under 100% output is superposed on each inverter, and a harmonic model of the photovoltaic power station is established.
7. The method for analyzing and governing the harmonic waves of the photovoltaic power station under the new energy power grid as claimed in claim 6, wherein: the filtering includes the steps of, in response to the filtering,
after the evaluation point harmonic wave is obtained, filtering is carried out on the overproof harmonic wave when the evaluation point harmonic wave is configured by adopting an SVG method, and the evaluation point harmonic wave content is calculated after the SVG is configured;
if the harmonic waves exceed the standard and are harmonic waves below the third harmonic wave, changing the filter parameters and the placement position of the SVG configuration, and sending reactive power capable of offsetting the first harmonic wave, the second harmonic wave and the third harmonic wave until the harmonic wave content rate is qualified;
if the harmonic wave exceeds the standard and is the harmonic wave above the third time, the SVG configuration filtering parameter and the placement position are changed, reactive power capable of offsetting the first harmonic wave, the second harmonic wave and the third harmonic wave is emitted, and the reactive power above the third harmonic wave is absorbed until the harmonic wave content rate is qualified.
8. The utility model provides a photovoltaic power plant harmonic analysis and treatment system under new forms of energy electric wire netting which characterized in that: comprises a power grid model building module, a harmonic model building module, a calculation module and a filtering module,
the power grid model building module builds a photovoltaic power station and a superior regional power grid model according to power and harmonic data of the photovoltaic power station;
the harmonic model building module is used for obtaining a power grid bus of a superior region and background harmonic of a photovoltaic power station inverter and building a photovoltaic power station harmonic model according to the background harmonic;
the calculation module is used for calculating the content rate of harmonic waves output by the harmonic waves of the photovoltaic power station at harmonic examination points of the photovoltaic power station and a bus of a superior regional power grid according to the harmonic wave model of the photovoltaic power station;
and the filtering module is used for superposing the bus harmonic evaluation point background harmonic of the upper-level regional power grid of the filtering module and the output harmonic of the photovoltaic power station to obtain the final harmonic content rate of the evaluation point, filtering the harmonic of the evaluation point to obtain the harmonic content rate of the photovoltaic power station and the upper-level regional power grid after the evaluation point is treated.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116885775A (en) * | 2023-07-10 | 2023-10-13 | 郭栋 | Analysis method for influence of grid-connected photovoltaic power generation system on power quality of power grid |
| CN117650521A (en) * | 2023-11-30 | 2024-03-05 | 深圳南控新能源有限公司 | Modeling method for harmonic interaction influence analysis model of photovoltaic power station and power distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116885775A (en) * | 2023-07-10 | 2023-10-13 | 郭栋 | Analysis method for influence of grid-connected photovoltaic power generation system on power quality of power grid |
| CN116885775B (en) * | 2023-07-10 | 2024-02-27 | 郭栋 | Analysis method for influence of grid-connected photovoltaic power generation system on power quality of power grid |
| CN117650521A (en) * | 2023-11-30 | 2024-03-05 | 深圳南控新能源有限公司 | Modeling method for harmonic interaction influence analysis model of photovoltaic power station and power distribution network |
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