CN104360151A - Detection method and system for reactive power loss of power transmission line - Google Patents
Detection method and system for reactive power loss of power transmission line Download PDFInfo
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Abstract
The invention provides a detection method and system for reactive power loss of a power transmission line. The method includes: acquiring state information of an ice-covered line to be detected; according to the state information, performing calculation to obtain electric field distribution and magnetic field distribution of the initial section of the ice-covered line to be detected; starting the initial section, selecting sections of the ice-covered line to be detected, in order, and according to the electric field distribution and magnetic field distribution of the initial section, performing recursion to obtain electric field distribution and magnetic field distribution of each section; according to the electric field distribution and magnetic field distribution of each section, acquiring three-dimensional spatial electric-magnetic field distribution of the ice-covered line to be detected; according to the three-dimensional spatial electric-magnetic field distribution, performing calculation to obtain reactive power loss of the ice-covered line to be detected. According to the method, the influence of the power transmission line being covered by ice is given to full consideration; thus, calculation of the reactive power loss is more accurate, and the reactive compensation need is met.
Description
Technical field
The application relates to transmission line of electricity reactive power compensation technology field, particularly relates to a kind of transmission line of electricity reactive power loss detection method and system.
Background technology
Reactive power is the operating key factor of electric power system design, with electric system can safe and stable operation and power economy closely bound up.In electric system, the equipment such as asynchronous motor and transformer will consume a large amount of reactive powers, if these reactive powers can not be compensated in time, can have a negative impact to the safety of electrical network, stable operation.First, consumer does not have enough reactive powers to set up normal electromagnetic field, and so these consumers just can not maintain and work in the nominal case, and the terminal voltage of consumer will decline, thus affect the normal operation of consumer.In addition, low power factor will be caused when system lacks reactive power to run and voltage drop, electrical equipment capacity is not in full use.In recent decades, along with expanding economy, the requirement of people to the quality of power supply is more and more higher, and keeps reactive power appropriate in electrical network, is the important leverage of power grid security, stable, economical operation.
At present, the reactive-load compensation of newly-built power transmission line is planned, be all that the single distribution parameter based on transmission capacity and circuit calculates, only considered the preset parameter value of circuit, and do not consider the impact of environmental factor on line parameter circuit value of surrounding.This design can only be effective in the comparatively gentle area of amblent air temperature, but the Northeast that environment is more severe in the winter time or other areas, ice covering on transmission lines is more serious, and ice covering on transmission lines can have an impact to the electric field around power transmission line, cause the loss of reactive power, therefore based on the Reactive Compensation Mode of Traditional calculating methods planning, the reactive compensation requirements under this state cannot be met, cause the inaccurate of reactive-load compensation.
Summary of the invention
In view of this, this application provides a kind of transmission line of electricity reactive power loss detection method and system, do not consider line ice coating when carrying out reactive power loss and calculating in prior art to overcome and cause result inaccurate and then the problem of reactive compensation requirements cannot be met.
For solving the problems of the technologies described above, the application provides following technical scheme:
A kind of transmission line of electricity reactive power loss detection method, comprising:
Gather the status information of icing circuit to be detected;
Described status information is utilized to calculate Electric Field Distribution and the Distribution of Magnetic Field of the initial cross-section of described icing circuit to be detected;
Described icing circuit to be detected is that dot sequency chooses cross section with described initial cross-section, has obtained Electric Field Distribution and the Distribution of Magnetic Field in each cross section according to the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion;
The Electric Field Distribution in described each cross section and Distribution of Magnetic Field is utilized to obtain the three dimensions magnetic distribution of described icing circuit to be detected;
The reactive power loss of described icing circuit to be detected is calculated according to described three dimensions magnetic distribution.
Preferably, described status information comprises: the specific inductive capacity of the voltage of initial end, electric current and described icing circuit to be detected.
Preferably, the Electric Field Distribution of described initial cross-section utilizes square amount-Analogue charge method to calculate;
The Distribution of Magnetic Field of described initial cross-section utilizes Biot-Sha to cut down law and calculates.
Preferably, the Electric Field Distribution in described each cross section and Distribution of Magnetic Field are specifically obtained by the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion according to frequency domain finite difference algorithm.
Preferably, described reactive power loss specifically utilizes Poynting vector and the relation of energy loss in passive dielectric space to calculate.
A kind of transmission line of electricity reactive power loss detection system, comprising: acquisition module, initial calculation module, recursion module, three-dimensional structure module and loss calculation module;
Described acquisition module, for gathering the status information of icing circuit to be detected;
Described initial calculation module, for the Electric Field Distribution and the Distribution of Magnetic Field that utilize described status information to calculate the initial cross-section of described icing circuit to be detected;
Described recursion module, for being that dot sequency chooses cross section with described initial cross-section on described icing circuit to be detected, has obtained Electric Field Distribution and the Distribution of Magnetic Field in each cross section according to the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion;
Described three-dimensional builds module, and Electric Field Distribution and Distribution of Magnetic Field for utilizing described each cross section obtain the three dimensions magnetic distribution of described icing circuit to be detected;
Described loss calculation module, for calculating the reactive power loss of described icing circuit to be detected according to described three dimensions magnetic distribution.
Preferably, the status information of described acquisition module collection comprises: the specific inductive capacity of the voltage of initial end, electric current and described icing circuit to be detected.
Preferably, described initial calculation module utilizes square amount-Analogue charge method to calculate the Electric Field Distribution of described initial cross-section;
Described initial calculation module utilize Biot-Sha to cut down Distribution of Magnetic Field that law calculates described initial cross-section.
Preferably, described recursion module is specifically obtained Electric Field Distribution and the Distribution of Magnetic Field in described each cross section by the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion according to frequency domain finite difference algorithm.
Preferably, described loss calculation module specifically utilizes Poynting vector and the relation of energy loss in passive dielectric space to calculate described reactive power loss.
From above technical scheme, this application provides a kind of transmission line of electricity reactive power loss detection method and system, the method comprises: the status information gathering icing circuit to be detected; Described status information is utilized to calculate Electric Field Distribution and the Distribution of Magnetic Field of the initial cross-section of described icing circuit to be detected; Described icing circuit to be detected is that dot sequency chooses cross section with described initial cross-section, has obtained Electric Field Distribution and the Distribution of Magnetic Field in each cross section according to the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion; The Electric Field Distribution in described each cross section and Distribution of Magnetic Field is utilized to obtain the three dimensions magnetic distribution of described icing circuit to be detected; The reactive power loss of described icing circuit to be detected is calculated according to described three dimensions magnetic distribution.The method has taken into full account the impact that powerline ice-covering causes, thus makes the calculating of reactive power loss more accurate, meets the requirement of reactive-load compensation.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The process flow diagram of a kind of transmission line of electricity reactive power loss detection method that Fig. 1 provides for the embodiment of the present application one;
The icing schematic diagram of the difformity that Fig. 2 provides for the embodiment of the present application one and thickness;
Different icing shape reactive loss change curve during the thin icing of one that Fig. 3 provides for the embodiment of the present application one;
Different icing shape reactive loss change curve during the thick icing of one that Fig. 4 provides for the embodiment of the present application one;
The structural representation of a kind of transmission line of electricity reactive power loss detection system that Fig. 5 provides for the embodiment of the present application two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Do not consider line ice coating when carrying out reactive power loss and calculating in prior art for overcoming and cause result inaccurate and then the problem of reactive compensation requirements cannot be met, this application provides a kind of transmission line of electricity reactive power loss detection method and system, concrete scheme is as described below:
Embodiment one
The embodiment of the present application one provides a kind of transmission line of electricity reactive power loss detection method, as shown in Figure 1, and the process flow diagram of a kind of transmission line of electricity reactive power loss detection method that Fig. 1 provides for the embodiment of the present application one.The method comprises:
S101: the status information gathering icing circuit to be detected.
Wherein, status information comprises: the specific inductive capacity of the voltage of initial end, electric current and described icing circuit to be detected.
Concrete, obtain overhead transmission line climatic condition along the line by observatory, adopt which to carry out the calculating of reactive power loss to the transmission line of electricity in the severe area of winter climate.
S102: utilization state information calculates Electric Field Distribution and the Distribution of Magnetic Field of the initial cross-section of icing circuit to be detected.
Wherein, in this application, the Electric Field Distribution of initial cross-section utilizes square amount-Analogue charge method to calculate, and the Distribution of Magnetic Field of initial cross-section utilizes Biot-Sha to cut down law and calculates.
Concrete, when calculating the two dimensional electric field distribution of the irregular icing of power transmission line, because icing mainly changes the dielectric coefficient around wire, magnetic field is not had an impact, thus mainly utilize square amount-Analogue charge method to calculate for Electric Field Distribution, the mathematical model of square amount-Analogue charge method is summed up as with potential function
for the Poisson equation of unknown quantity or the Definite problem of Laplace's equation.
Control of Electric potentials equation:
or
First Boundary Condition:
The interface condition of different medium:
Obtain electric field intensity:
In formula,
for the current potential on interphase in two media; ε
1, ε
2for the specific inductive capacity of two media; P coefficient of potential matrix; ρ is the volume density of free charge in medium.Then cut down law in conjunction with Biot-Sha and calculate initial cross-section magnetic distribution, repeat no more in this application.
S103: be that dot sequency chooses cross section with initial cross-section on icing circuit to be detected, obtains Electric Field Distribution and the Distribution of Magnetic Field in each cross section according to the Electric Field Distribution of initial cross-section and Distribution of Magnetic Field recursion.
Wherein, the Electric Field Distribution in each cross section and Distribution of Magnetic Field are specifically obtained by the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion according to frequency domain finite difference algorithm.
Concrete, from frequency domain finite difference FDFD (finite-differencefrequency-domain) algorithm of space stepping, for certain cross section to be asked, if the boundary condition in this cross section known, can the magnetic distribution in this cross section of recursion according to adjacent sections magnetic distribution known above, realize the Parallel Recursive computing of each cross section magnetic distribution of three dimensions.Therefore when after the magnetic distribution obtaining initial cross-section, adopt the frequency domain finite difference algorithm of space stepping, the identical cross section of some size shape is intercepted at equal intervals to whole power transmission line, in turn from the magnetic distribution in a cross section after the recursion of first cross section, until last cross section.
S104: utilize the Electric Field Distribution in each cross section and Distribution of Magnetic Field to obtain the three dimensions magnetic distribution of icing circuit to be detected.
The two dimensional electric field distribution in each cross section gone out according to the FDFD algorithmic derivation by space stepping and Distribution of Magnetic Field can obtain three dimensions electromagnetic field and the electromagnetic energy distribution situation of the power transmission line energy-transmission channel of the long distance of large space, i.e. the three dimensions magnetic distribution of icing circuit to be detected.
S105: the reactive power loss calculating icing circuit to be detected according to three dimensions magnetic distribution.
Wherein, reactive power loss specifically utilizes Poynting vector and the relation of energy loss in passive dielectric space to calculate.
Concrete, after the three dimensions magnetic distribution obtaining icing circuit to be detected, the relation in passive dielectric space by Poynting vector and energy loss, draws the reactive loss in icing transmission line of electricity.Poynting vector and the relation of energy loss in passive dielectric space:
Wherein, Δ Q
efor unit volume electric field energy increment rate, tried to achieve by previous calculations electric field; Δ Q
mfor unit volume magnetic field energy, increment rate is tried to achieve by previous calculations magnetic field; Δ P
jfor unit volume heating loss.
Above formula both sides are divided can obtain whole transmission space cubes:
Try to achieve the loss situation of reactive power transmission
It should be noted that, as shown in Figure 2, the icing schematic diagram of the difformity that Fig. 2 provides for the embodiment of the present application one and thickness, wherein ice covering on transmission lines shape comprises: circular thin icing, oval thin icing, crescent thin icing, the thick icing of concentration ellipse, the thick icing of eccentric elliptic, wing thick icing etc.
From Fig. 3 and Fig. 4, the power transmission line reactive loss Δ Q Changing Pattern of different thin icing shape is: the oval < of circular < is crescent.Sectional area is that the total reactive loss of crescent icing power transmission line of 1.25sc is maximum, relatively adds about 2.56% without icing situation.
In thick icing situation, Δ Q still increases with icing sectional area and increases.When icing sectional area is identical, the Δ Q loss rule of different icing shape is: concentration ellipse is substantially identical with the Δ Q of eccentric elliptic, only there is nuance when icing sectional area is less, because eccentric elliptic side-play amount is fixed as 12mm, its relative displacement becomes large along with icing sectional area and diminishes, and illustrates that oval icing eccentric situation when relative displacement is less is little with concentric situation difference.Wing icing Δ Q is large compared with the above two.From in figure relatively, 40cm
2the Δ Q relative increment that causes of wing icing be 4.61%.According to result of calculation, the reactive-load compensation design that finally can be the new transmission line of electricity built provides reference.
Embodiment two
The embodiment of the present application two provides a kind of transmission line of electricity reactive power loss detection system, as shown in Figure 5, and the structural representation of a kind of transmission line of electricity reactive power loss detection system that Fig. 5 provides for the embodiment of the present application two.This system comprises: acquisition module 501, initial calculation module 502, recursion module 503, three-dimensional structure module 504 and loss calculation module 505.
Acquisition module 501, for gathering the status information of icing circuit to be detected.
The status information that acquisition module 501 gathers comprises: the specific inductive capacity of the voltage of initial end, electric current and described icing circuit to be detected.
Concrete, obtain overhead transmission line climatic condition along the line by observatory, adopt which to carry out the calculating of reactive power loss to the transmission line of electricity in the severe area of winter climate.
Initial calculation module 502, calculates Electric Field Distribution and the Distribution of Magnetic Field of the initial cross-section of icing circuit to be detected for utilization state information.
Initial calculation module 501 specifically utilizes square amount-Analogue charge method to calculate the Electric Field Distribution of initial cross-section, utilize Biot-Sha to cut down Distribution of Magnetic Field that law calculates initial cross-section.
Concrete, when calculating the two dimensional electric field distribution of the irregular icing of power transmission line, because icing mainly changes the dielectric coefficient around wire, magnetic field is not had an impact, thus mainly utilize square amount-Analogue charge method to calculate for Electric Field Distribution, the mathematical model of square amount-Analogue charge method is summed up as with potential function
for the Poisson equation of unknown quantity or the Definite problem of Laplace's equation.
Control of Electric potentials equation:
or
First Boundary Condition:
The interface condition of different medium:
Obtain electric field intensity:
In formula,
for the current potential on interphase in two media; ε
1, ε
2for the specific inductive capacity of two media; P coefficient of potential matrix; ρ is the volume density of free charge in medium.Then cut down law in conjunction with Biot-Sha and calculate initial cross-section magnetic distribution, repeat no more in this application.
Recursion module 503, for being that dot sequency chooses cross section with initial cross-section on icing circuit to be detected, has obtained Electric Field Distribution and the Distribution of Magnetic Field in each cross section according to the Electric Field Distribution of initial cross-section and Distribution of Magnetic Field recursion.
Recursion module 503 is specifically obtained Electric Field Distribution and the Distribution of Magnetic Field in each cross section by the Electric Field Distribution of initial cross-section and Distribution of Magnetic Field recursion according to frequency domain finite difference algorithm.
Concrete, from frequency domain finite difference FDFD (finite-differencefrequency-domain) algorithm of space stepping, for certain cross section to be asked, if the boundary condition in this cross section known, can the magnetic distribution in this cross section of recursion according to adjacent sections magnetic distribution known above, realize the Parallel Recursive computing of each cross section magnetic distribution of three dimensions.Therefore when after the magnetic distribution obtaining initial cross-section, adopt the frequency domain finite difference algorithm of space stepping, the identical cross section of some size shape is intercepted at equal intervals to whole power transmission line, in turn from the magnetic distribution in a cross section after the recursion of first cross section, until last cross section.
Three-dimensional structure module 504, Electric Field Distribution and Distribution of Magnetic Field for utilizing each cross section obtain the three dimensions magnetic distribution of icing circuit to be detected.
The two dimensional electric field distribution in each cross section gone out according to the FDFD algorithmic derivation by space stepping and Distribution of Magnetic Field can obtain three dimensions electromagnetic field and the electromagnetic energy distribution situation of the power transmission line energy-transmission channel of the long distance of large space, i.e. the three dimensions magnetic distribution of icing circuit to be detected.
Loss calculation module 505, for calculating the reactive power loss of icing circuit to be detected according to three dimensions magnetic distribution.
Loss calculation module 505 specifically utilizes Poynting vector and the relation of energy loss in passive dielectric space to calculate reactive power loss.
Concrete, after the three dimensions magnetic distribution obtaining icing circuit to be detected, the relation in passive dielectric space by Poynting vector and energy loss, draws the reactive loss in icing transmission line of electricity.Poynting vector and the relation of energy loss in passive dielectric space:
Wherein, Δ Q
efor unit volume electric field energy increment rate, tried to achieve by previous calculations electric field; Δ Q
mfor unit volume magnetic field energy, increment rate is tried to achieve by previous calculations magnetic field; Δ P
jfor unit volume heating loss.
Above formula both sides are divided can obtain whole transmission space cubes:
Try to achieve the loss situation of reactive power transmission
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a transmission line of electricity reactive power loss detection method, is characterized in that, comprising:
Gather the status information of icing circuit to be detected;
Described status information is utilized to calculate Electric Field Distribution and the Distribution of Magnetic Field of the initial cross-section of described icing circuit to be detected;
Described icing circuit to be detected is that dot sequency chooses cross section with described initial cross-section, has obtained Electric Field Distribution and the Distribution of Magnetic Field in each cross section according to the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion;
The Electric Field Distribution in described each cross section and Distribution of Magnetic Field is utilized to obtain the three dimensions magnetic distribution of described icing circuit to be detected;
The reactive power loss of described icing circuit to be detected is calculated according to described three dimensions magnetic distribution.
2. method according to claim 1, is characterized in that, described status information comprises: the specific inductive capacity of the voltage of initial end, electric current and described icing circuit to be detected.
3. method according to claim 1, is characterized in that, the Electric Field Distribution of described initial cross-section utilizes square amount-Analogue charge method to calculate;
The Distribution of Magnetic Field of described initial cross-section utilizes Biot-Sha to cut down law and calculates.
4. method according to claim 1, is characterized in that, the Electric Field Distribution in described each cross section and Distribution of Magnetic Field are specifically obtained by the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion according to frequency domain finite difference algorithm.
5. method according to claim 1, is characterized in that, described reactive power loss specifically utilizes Poynting vector and the relation of energy loss in passive dielectric space to calculate.
6. a transmission line of electricity reactive power loss detection system, is characterized in that, comprising: acquisition module, initial calculation module, recursion module, three-dimensional structure module and loss calculation module;
Described acquisition module, for gathering the status information of icing circuit to be detected;
Described initial calculation module, for the Electric Field Distribution and the Distribution of Magnetic Field that utilize described status information to calculate the initial cross-section of described icing circuit to be detected;
Described recursion module, for being that dot sequency chooses cross section with described initial cross-section on described icing circuit to be detected, has obtained Electric Field Distribution and the Distribution of Magnetic Field in each cross section according to the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion;
Described three-dimensional builds module, and Electric Field Distribution and Distribution of Magnetic Field for utilizing described each cross section obtain the three dimensions magnetic distribution of described icing circuit to be detected;
Described loss calculation module, for calculating the reactive power loss of described icing circuit to be detected according to described three dimensions magnetic distribution.
7. system according to claim 6, is characterized in that, the status information of described acquisition module collection comprises: the specific inductive capacity of the voltage of initial end, electric current and described icing circuit to be detected.
8. system according to claim 6, is characterized in that, described initial calculation module utilizes square amount-Analogue charge method to calculate the Electric Field Distribution of described initial cross-section;
Described initial calculation module utilize Biot-Sha to cut down Distribution of Magnetic Field that law calculates described initial cross-section.
9. system according to claim 6, is characterized in that, described recursion module is specifically obtained Electric Field Distribution and the Distribution of Magnetic Field in described each cross section by the Electric Field Distribution of described initial cross-section and Distribution of Magnetic Field recursion according to frequency domain finite difference algorithm.
10. system according to claim 6, is characterized in that, described loss calculation module specifically utilizes Poynting vector and the relation of energy loss in passive dielectric space to calculate described reactive power loss.
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Application publication date: 20150218 |