CN116660623A - Harmonic detection method and system for power distribution network with distributed power supply - Google Patents
Harmonic detection method and system for power distribution network with distributed power supply Download PDFInfo
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Abstract
The application belongs to the technical field of power distribution network fault detection, and particularly relates to a power distribution network harmonic detection method and system comprising the following steps of: carrying out harmonic treatment partition on a power distribution network containing a distributed power supply; the voltage detection type active filter is connected into the partitioned power distribution network, and a sensitivity matrix of the power distribution network is calculated; constructing a harmonic detection model of the power distribution network by taking the minimum sum of voltage harmonic distortion rates of all nodes in the power distribution network as a target, and finishing the harmonic detection of the power distribution network containing the distributed power supply; the constructed power distribution network harmonic detection model adopts a combined harmonic detection method combining a windowing interpolation algorithm and wavelet packet transformation.
Description
Technical Field
The application belongs to the technical field of power distribution network fault detection, and particularly relates to a power distribution network harmonic detection method and system containing a distributed power supply.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The distributed power supply is flexibly connected into the power distribution network through the converter. The high-capacity distributed power supply is connected into the power distribution network through a 10kV or 35kV bus, and the low-capacity distributed power supply, particularly photovoltaic power generation, is directly connected into a user side through an inverter. Due to the dispersibility, uncertainty and universality of the distributed power supply access to the power distribution network, as the proportion of the distributed power supply access to the power distribution network increases year by year, harmonic superposition effects generated by a large number of distributed power supplies are not negligible, and harmonic amplification can be caused. Therefore, the harmonic problem of the high-proportion distributed power supply connected to the power distribution network is increasingly serious and complex, and harmonic treatment becomes a problem to be solved urgently.
Harmonic suppression is always a research hotspot in the field of power systems. In the traditional power distribution network, the distributed power supply is fewer, harmonic waves are mainly generated by special users, the harmonic waves are concentrated, point-to-point harmonic wave treatment can be performed, and when the number of the harmonic wave sources is fewer, effective treatment can be realized by adopting the current detection type active filter. Along with the large-scale access of the distributed power supply, the number of harmonic sources in the power distribution network is large, the distribution is wide, the distributed point-to-point treatment scheme only makes a decision according to the on-site information quantity, so that a plurality of harmonic treatment devices cannot cooperate with each other, and the treatment effect is poor. Meanwhile, the point-to-point dispersion treatment cost is high, so that comprehensive treatment is performed from the perspective of the whole power grid, and the research on systematically performing harmonic treatment from the perspective of the power grid is necessary.
Disclosure of Invention
In order to solve the problems, the application provides a method and a system for detecting the harmonic waves of a power distribution network with a distributed power supply, and aims at solving the problem that the detection of the power harmonic waves on the unsteady harmonic waves is inaccurate, and the method for detecting the harmonic waves of the power distribution network by combining a Blackman window interpolation algorithm with db44 wavelet packet transformation is adopted.
According to some embodiments, the first scheme of the application provides a method for detecting harmonic waves of a power distribution network with a distributed power supply, which adopts the following technical scheme:
a harmonic detection method for a power distribution network with a distributed power supply comprises the following steps:
carrying out harmonic treatment partition on a power distribution network containing a distributed power supply;
the voltage detection type active filter is connected into the partitioned power distribution network, and a sensitivity matrix of the power distribution network is calculated;
constructing a harmonic detection model of the power distribution network by taking the minimum sum of voltage harmonic distortion rates of all nodes in the power distribution network as a target, and finishing the harmonic detection of the power distribution network containing the distributed power supply;
the constructed power distribution network harmonic detection model adopts a combined harmonic detection method combining a windowing interpolation algorithm and wavelet packet transformation.
As a further technical limitation, in the process of harmonic governance partition, harmonic sensitivity is adopted as a configuration voltage detection type active filter, and governance of node harmonic voltage is performed by controlling the increment of node branch conductance.
Further, the harmonic sensitivity S h,j,i Is thatWherein h is the dominant harmonic frequency, j, i are nodes, U h,j For the h-order harmonic voltage of node j, G h,i Is the equivalent conductance of node i.
As a further technical definition, the sensitivity matrix S isAnd n is a power distribution network node, m is a power distribution network node for configuring the voltage detection type active filter, and the number of controlled nodes is n-m.
As a further technical limitation, the minimum sum of voltage harmonic distortion rates of all nodes in the power grid is taken as a target, and the difference degree of the voltage harmonic level requirements of different voltage nodes is considered by setting a weight coefficient in the optimization process of taking the voltage distortion rate as the target in consideration of the different requirements of different electric equipment on the electric energy quality.
Further, the weight coefficient of the node is taken as mu j The objective function of the harmonic detection model of the power distribution network is thatWherein mu j The weight coefficient of the node j; u (U) THD,j As the voltage distortion rate of node j,U 1,j is the fundamental voltage amplitude.
As a further technical limitation, a combination algorithm of Blackman window Fourier transform and db44 wavelet packet transform is adopted to analyze transient harmonics, the db44 wavelet packet transform is adopted to decompose and reconstruct the transient harmonics to obtain waveforms of fundamental wave and sub-harmonic components, and the Blackman window Fourier transform is adopted to analyze the fundamental wave and the sub-harmonic components to obtain frequencies and amplitudes of the fundamental wave and the sub-harmonic components, so that harmonic detection is completed.
According to some embodiments, the second scheme of the application provides a harmonic detection system of a power distribution network with a distributed power supply, which adopts the following technical scheme:
a power distribution network harmonic detection system including a distributed power source, comprising:
a partitioning module configured to perform harmonic remediation partitioning of a power distribution network including a distributed power source;
the calculation module is configured to access the voltage detection type active filter into the partitioned power distribution network and calculate a sensitivity matrix of the power distribution network;
the detection module is configured to construct a harmonic detection model of the power distribution network by taking the minimum sum of voltage harmonic distortion rates of all nodes in the power distribution network as a target, so as to complete the harmonic detection of the power distribution network containing the distributed power supply;
the constructed power distribution network harmonic detection model adopts a combined harmonic detection method combining a windowing interpolation algorithm and wavelet packet transformation.
According to some embodiments, a third aspect of the present application provides a computer-readable storage medium, which adopts the following technical solutions:
a computer readable storage medium having stored thereon a program which when executed by a processor performs the steps of a method for harmonic detection of a power distribution network comprising a distributed power source according to the first aspect of the present application.
According to some embodiments, a fourth aspect of the present application provides an electronic device, which adopts the following technical solutions:
an electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the steps in the method for detecting harmonics of a power distribution network comprising a distributed power supply according to the first aspect of the application when the program is executed by the processor.
Compared with the prior art, the application has the beneficial effects that:
aiming at the problem that the existing power harmonic detection is inaccurate to unsteady harmonic detection, the application adopts a combined harmonic detection method combining a Blackman window interpolation algorithm and db44 wavelet packet transformation, improves the precision of harmonic detection of a power distribution network with a distributed power supply, effectively manages power grid harmonic wave and reduces the voltage harmonic distortion rate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate and explain the embodiments and together with the description serve to explain the embodiments.
Fig. 1 is a flowchart of a method for detecting harmonic waves of a power distribution network including a distributed power supply according to a first embodiment of the present application;
FIG. 2 is a flowchart of a method for joint harmonic detection according to a first embodiment of the present application;
fig. 3 is a block diagram of a harmonic detection system of a power distribution network including a distributed power supply according to a second embodiment of the present application.
Detailed Description
The application will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the application and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment of the application introduces a harmonic detection method for a power distribution network with a distributed power supply.
The method for detecting the harmonic waves of the power distribution network with the distributed power supply shown in fig. 1 comprises the following steps:
carrying out harmonic treatment partition on a power distribution network containing a distributed power supply;
the voltage detection type active filter is connected into the partitioned power distribution network, and a sensitivity matrix of the power distribution network is calculated;
constructing a harmonic detection model of the power distribution network by taking the minimum sum of voltage harmonic distortion rates of all nodes in the power distribution network as a target, and finishing the harmonic detection of the power distribution network containing the distributed power supply;
the constructed power distribution network harmonic detection model adopts a combined harmonic detection method combining a windowing interpolation algorithm and wavelet packet transformation.
In the embodiment, in the process of harmonic governance partition, harmonic sensitivity is adopted as a configuration voltage detection type active filter, and governance of node harmonic voltage is performed by controlling the increment of node branch conductance.
Harmonic sensitivity S h,j,i Is thatWherein h is the dominant harmonic frequency, j, i are nodes, U h,j For the h-order harmonic voltage of node j, G h,i Equivalent conductance for node i; the sensitivity matrix S isAnd n is a power distribution network node, m is a power distribution network node for configuring the voltage detection type active filter, and the number of controlled nodes is n-m.
And in the optimization process of taking the voltage distortion rate as a target by taking the minimum sum of the voltage harmonic distortion rates of all nodes in the power grid into consideration, the different requirements of different electric equipment on the electric energy quality, and taking the degree of difference of the voltage harmonic level requirements of different voltage nodes into consideration by setting a weight coefficient. Taking the weight coefficient of the node as mu j The objective function of the harmonic detection model of the power distribution network is thatWherein mu j The weight coefficient of the node j; u (U) THD,j For the voltage distortion rate of node j, +.>U 1,j Is the fundamental voltage amplitude.
Even though the Blackman Fourier transform algorithm has the advantages of simple implementation method, high detection precision and convenient use, the characteristics of the transient signals cannot be extracted, the wavelet packet transform can detect the transient signals, but for the steady-state signals, the frequency and amplitude information of each steady-state signal cannot be obtained accurately as the Fourier transform. The method for detecting the transient power harmonic wave by adopting a combined harmonic wave detection method combining a Blackman window Fourier transform algorithm and wavelet packet transform comprises the following specific scheme: the detection signal is decomposed into a low-frequency approximate part and a high-frequency detail part through wavelet packet transformation, transient components are contained in the high-frequency detail part, each sub-steady-state component is in the low-frequency approximate part, and the wavelet packet transformation is used for analyzing the part to obtain characteristic information of the transient components. Analyzing the decomposed steady-state component by using a Blackman window interpolation algorithm to obtain the frequency and amplitude of the steady-state component; a flowchart of the joint harmonic detection method in this embodiment is shown in fig. 2.
The combined harmonic detection algorithm combining the Blackman window interpolation algorithm and the wavelet packet transform employed in the present embodiment is possible. The principle is that the time-frequency characteristic of wavelet packet transformation is utilized, after the signal is decomposed by wavelet packet transformation, the attenuation component is contained in the decomposed high-frequency part, so that the time when the signal is attenuated is determined, and the attenuation component of the signal can be well observed by wavelet packet transformation. However, wavelet packet transformation does not have fourier transform characteristics, and accurate frequency and amplitude information cannot be obtained by analyzing a steady-state limit number. Therefore, the low-frequency part containing each sub-steady-state component after wavelet packet transformation is analyzed by a Blackman window interpolation algorithm to obtain accurate frequency and amplitude information of each sub-steady-state. The time when the signal is attenuated can be determined by a combined algorithm combining the Blackman window interpolation algorithm and the wavelet packet transformation, and the frequency and the amplitude of each stable signal can be accurately obtained.
Aiming at the problem that the existing power harmonic detection is inaccurate to unsteady harmonic detection, the embodiment adopts a combined harmonic detection method combining a Blackman window interpolation algorithm and db44 wavelet packet transformation, improves the precision of harmonic detection of a power distribution network with a distributed power supply, effectively governs power grid harmonic waves and reduces the voltage harmonic distortion rate.
Example two
The second embodiment of the application introduces a harmonic detection system of a power distribution network with a distributed power supply.
A harmonic detection system for a power distribution network including a distributed power source as shown in fig. 3, comprising:
a partitioning module configured to perform harmonic remediation partitioning of a power distribution network including a distributed power source;
the calculation module is configured to access the voltage detection type active filter into the partitioned power distribution network and calculate a sensitivity matrix of the power distribution network;
the detection module is configured to construct a harmonic detection model of the power distribution network by taking the minimum sum of voltage harmonic distortion rates of all nodes in the power distribution network as a target, so as to complete the harmonic detection of the power distribution network containing the distributed power supply;
the constructed power distribution network harmonic detection model adopts a combined harmonic detection method combining a windowing interpolation algorithm and wavelet packet transformation.
The detailed steps are the same as those of the method for detecting the harmonic waves of the power distribution network including the distributed power supply provided in the first embodiment, and are not described herein again.
Example III
The third embodiment of the application provides a computer readable storage medium.
A computer readable storage medium having stored thereon a program which when executed by a processor performs the steps of a method for harmonic detection of a power distribution network having distributed power sources according to an embodiment of the present application.
The detailed steps are the same as those of the method for detecting the harmonic waves of the power distribution network including the distributed power supply provided in the first embodiment, and are not described herein again.
Example IV
The fourth embodiment of the application provides electronic equipment.
An electronic device includes a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor implements the steps in the method for detecting harmonics of a power distribution network including a distributed power supply according to the first embodiment of the application when the program is executed by the processor.
The detailed steps are the same as those of the method for detecting the harmonic waves of the power distribution network including the distributed power supply provided in the first embodiment, and are not described herein again.
The above description is only a preferred embodiment of the present embodiment, and is not intended to limit the present embodiment, and various modifications and variations can be made to the present embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Claims (10)
1. The utility model provides a distribution network harmonic detection method that contains distributed power supply which characterized in that includes:
carrying out harmonic treatment partition on a power distribution network containing a distributed power supply;
the voltage detection type active filter is connected into the partitioned power distribution network, and a sensitivity matrix of the power distribution network is calculated;
constructing a harmonic detection model of the power distribution network by taking the minimum sum of voltage harmonic distortion rates of all nodes in the power distribution network as a target, and finishing the harmonic detection of the power distribution network containing the distributed power supply;
the constructed power distribution network harmonic detection model adopts a combined harmonic detection method combining a windowing interpolation algorithm and wavelet packet transformation.
2. The method for detecting harmonic waves of a power distribution network with a distributed power supply according to claim 1, wherein in the process of harmonic wave treatment and partitioning, harmonic wave sensitivity is adopted as a configuration voltage detection type active filter, and node harmonic wave voltage treatment is performed by controlling the increment of node branch circuit conductance.
3. A method for harmonic detection in a power distribution network including a distributed power source as claimed in claim 2, wherein said harmonic sensitivity S h,j,i Is thatWherein h is the dominant harmonic frequency, j, i are nodes, U h,j For the h-order harmonic voltage of node j, G h,i Is the equivalent conductance of node i.
4. A method for harmonic detection in a power distribution network including a distributed power source as claimed in claim 1, wherein said sensitivity matrix S isAnd n is a power distribution network node, m is a power distribution network node for configuring the voltage detection type active filter, and the number of controlled nodes is n-m.
5. The method for detecting harmonic waves of a power distribution network with a distributed power supply according to claim 1, wherein the method is characterized in that the sum of voltage harmonic distortion rates of all nodes in the power distribution network is taken as a target, different requirements of different electric equipment on electric energy quality are considered, and in the process of optimizing the voltage distortion rates as the target, the degree of difference of the voltage harmonic level requirements of different voltage nodes is considered by setting weight coefficients.
6. The method for detecting harmonic waves of power distribution network with distributed power supply as claimed in claim 5, wherein the weighting coefficient of the node is μ j The objective function of the harmonic detection model of the power distribution network is thatWherein mu j The weight coefficient of the node j; u (U) THD,j For the voltage distortion rate of node j, +.>U 1,j Is the fundamental voltage amplitude.
7. The method for detecting harmonic waves of a power distribution network with a distributed power supply according to claim 1, wherein a combination algorithm of Blackman window Fourier transform and db44 wavelet packet transform is adopted to analyze transient harmonic waves, the transient harmonic waves are decomposed and reconstructed through db44 wavelet packet transform to obtain waveforms of fundamental wave and sub-harmonic components, and then Blackman window Fourier transform is adopted to analyze the fundamental wave and the sub-harmonic components to obtain frequencies and amplitudes of the fundamental wave and the sub-harmonic components, so that harmonic wave detection is completed.
8. A power distribution network harmonic detection system including a distributed power source, comprising:
a partitioning module configured to perform harmonic remediation partitioning of a power distribution network including a distributed power source;
the calculation module is configured to access the voltage detection type active filter into the partitioned power distribution network and calculate a sensitivity matrix of the power distribution network;
the detection module is configured to construct a harmonic detection model of the power distribution network by taking the minimum sum of voltage harmonic distortion rates of all nodes in the power distribution network as a target, so as to complete the harmonic detection of the power distribution network containing the distributed power supply;
the constructed power distribution network harmonic detection model adopts a combined harmonic detection method combining a windowing interpolation algorithm and wavelet packet transformation.
9. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of a method for harmonic detection of a power distribution network comprising a distributed power supply as claimed in any one of claims 1 to 7.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the method for harmonic detection of a power distribution network comprising a distributed power supply as claimed in any one of claims 1 to 7 when the program is executed by the processor.
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