CN112380711A - Three-phase unbalance calculation method and device based on consideration of zero line loss - Google Patents
Three-phase unbalance calculation method and device based on consideration of zero line loss Download PDFInfo
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Abstract
The application provides a three-phase unbalance calculation method and a three-phase unbalance calculation device based on consideration of zero line loss. The method comprises the following steps: acquiring basic data; building a platform area calculation model according to the basic data; calculating the current of the A phase of each section of the conducting wire and the voltage of the A phase of the tail end node by adopting a transformer area calculation model; calculating the current of the B phase of each section of wire and the voltage of the B phase of the tail end node by adopting a transformer area calculation model; calculating the C-phase current of each section of wire and the C-phase voltage of a tail end node by adopting a transformer area calculation model; and calculating loss of each section of the wire, zero line current and three-phase unbalance degree of the platform area according to part or all of the A-phase current of each section of the wire, the A-phase voltage of the tail end node, the B-phase current of the wire, the B-phase voltage of the tail end node, the C-phase current of the wire and the C-phase voltage of the tail end node. According to the scheme, the three-phase unbalance accurate calculation based on the consideration of zero line loss is realized.
Description
Technical Field
The application relates to the field of distribution room three-phase unbalance calculation, in particular to a three-phase unbalance calculation method, a calculation device, a computer readable storage medium and a processor based on consideration of zero line loss.
Background
The low-voltage transformer area loss electric quantity occupies a great proportion in an electric power system, and for the power grid in China, a large amount of electric energy can be saved by adopting corresponding measures to reduce the transformer area loss, so that the low-voltage transformer area loss electric quantity has great loss reduction and electricity saving potential. The unbalanced three phase of the transformer area is an important factor that the loss electric quantity of the transformer area is high, the unbalanced three phase of the transformer area can cause that a certain phase current is too large, the loss of a circuit can be increased, the risk that the circuit is burnt out is increased, and the safe power supply is influenced.
The relatively accurate platform district full-phase algorithm can play an important guiding role in reducing loss and treating three-phase unbalance of the platform district. The three-phase unbalance calculation method based on the consideration of the zero line loss is an improvement and supplement of the existing transformer area loss algorithm by considering the loss of the zero line, and can calculate the transformer area loss and the transformer area three-phase unbalance more accurately. The calculation logic is optimized and improved correspondingly based on the three-phase unbalance calculation method considering the zero line loss, and the calculation speed is higher under the condition of the same data quantity.
For the current situations of the loss calculation and the three-phase imbalance calculation of the transformer area used by the current power unit, an efficient, standardized and accurate algorithm is needed to support the loss reduction improvement and the three-phase imbalance management of the transformer area.
Disclosure of Invention
The present application mainly aims to provide a method, an apparatus, a computer readable storage medium, and a processor for calculating a three-phase imbalance based on consideration of zero line loss, so as to solve the problem that a high-precision method for calculating a three-phase imbalance based on consideration of zero line loss is lacking in the prior art.
In order to achieve the above object, according to an aspect of the present application, there is provided a method for calculating a three-phase imbalance based on consideration of zero line loss, including: acquiring basic data; building a platform area calculation model according to the basic data; calculating the current of the A phase of each section of the conducting wire and the voltage of the A phase of the tail end node by adopting the transformer area calculation model; calculating the current of the B phase of each section of the conducting wire and the voltage of the B phase of the tail end node by adopting the transformer area calculation model; calculating the C-phase current of each section of the conducting wire and the C-phase voltage of the tail end node by adopting the transformer area calculation model; and calculating loss of each section of the wire, zero line current and three-phase unbalance degree of the transformer area at least according to part or all of the A-phase current of each section of the wire, the A-phase voltage of the tail end node, the B-phase current of the wire, the B-phase voltage of the tail end node, the C-phase current of the wire and the C-phase voltage of the tail end node.
Further, the calculating the current of the phase a of each segment of the conducting wire and the voltage of the phase a of the end node by using the platform area calculation model includes: calculating the phase A current of each section of the conducting wire from the tail end to the head end by using initial voltage; calculating the phase voltage of the tail end node A of each section of the conducting wire by using the phase current A of each section of the conducting wire; comparing the voltage of the A-phase of the tail end node of each section of the wire with the voltage of the A-phase of the tail end node of the wire obtained by the last calculation to obtain the maximum value of voltage deviation; judging whether the calculation is convergent according to the maximum value of the voltage deviation calculated in two nearest adjacent times; step five, if convergence occurs, storing the phase A current of each section of the conducting wire and the phase A voltage of the tail end node; and step six, if the convergence is not achieved, repeating the step one to the step four until the convergence is achieved.
Further, calculating the phase A current of each section of wire, comprising: calculating the end user A-phase current by adopting a first formula, wherein the first formula is expressed as:
wherein I represents the terminal user A phase current, A represents the low-voltage A phase user electricity quantity, T represents the power supply time, U represents the A phase voltage,
representing a head end power factor; calculating the A-phase currents of all the wires by adopting a second formula, wherein the second formula is expressed as:
wherein IA represents all the wires A phase current, and Ia represents the connected wires or user A phase current; calculating the voltage drop of each section of the wire by adopting a third formula, wherein the third formula is expressed as: Δ U ═ Ia × R, where Δ U represents the voltage drop per wire segment and R represents the wire segment resistance; calculating the terminal voltage of the wire section by adopting a fourth formula, wherein the fourth formula is expressed as: u end is U head- Δ U, wherein U head represents the voltage at the head end of the wire section, and U end represents the voltage at the tail end of the wire section; according toAnd obtaining the A-phase current of each section of the wire by using a calculation formula of the tail end voltage of the wire section, the user current and the wire section current.
Further, judging whether the calculation is converged according to the maximum voltage deviation values calculated by two nearest adjacent times comprises the following steps: the maximum value of the voltage deviation calculated in two nearest adjacent times is less than 10-5Determining convergence; the maximum value of the voltage deviation calculated in two nearest adjacent times is greater than or equal to 10-5When it is determined not to converge.
According to another aspect of the present application, there is provided a calculation apparatus based on three-phase unbalance considering zero line loss, comprising: an acquisition unit configured to acquire basic data; the building unit is used for building a platform area calculation model according to the basic data; the first calculation unit is used for calculating the current of the phase A of each section of conducting wire and the voltage of the phase A of the tail end node by adopting the distribution room calculation model; the second calculation unit is used for calculating the current of the B phase of each section of the conducting wire and the voltage of the B phase of the tail end node by adopting the distribution room calculation model; the third calculation unit is used for calculating the C-phase current of each section of the conducting wire and the C-phase voltage of the tail end node by adopting the distribution area calculation model; and the fourth calculation unit is used for calculating loss of each section of the conducting wire, zero line current and platform area three-phase unbalance degree at least according to part or all of the A-phase current of each section of the conducting wire, the A-phase voltage of the tail end node, the B-phase current of the conducting wire, the B-phase voltage of the tail end node, the C-phase current of the conducting wire and the C-phase voltage of the tail end node.
According to yet another aspect of the present application, a computer-readable storage medium is provided, which includes a stored program, wherein the program when executed controls an apparatus in which the computer-readable storage medium is located to perform any one of the calculation methods based on the three-phase imbalance considering the zero-line loss.
According to a further aspect of the present application, a processor is provided, the processor is configured to run a program, wherein the program is run to perform any one of the above calculation methods based on three-phase imbalance considering zero-line loss.
By applying the technical scheme, the accurate calculation of three-phase unbalance based on consideration of zero line loss is realized by acquiring basic data, constructing a platform area calculation model according to the basic data, calculating the A-phase current and the A-phase voltage of the tail end node of each section of wire by adopting the platform area calculation model, calculating the B-phase current and the B-phase voltage of the tail end node of each section of wire, calculating the C-phase current and the C-phase voltage of the tail end node of each section of wire, and calculating the loss of each section of wire, the zero line current and the three-phase unbalance of the platform area.
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The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 shows a flow chart of a method of calculating a three-phase imbalance based on accounting for zero line losses according to an embodiment of the application;
fig. 2 shows a schematic diagram of a computing device based on a three-phase imbalance considering neutral losses according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Also, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background art, a high-precision three-phase imbalance calculation method based on consideration of zero line loss is absent in the prior art, and in order to solve the problem that a high-precision three-phase imbalance calculation method based on consideration of zero line loss is absent in the prior art, embodiments of the present application provide a calculation method based on consideration of zero line loss, a calculation apparatus, a computer-readable storage medium, and a processor.
According to an embodiment of the application, a three-phase imbalance calculation method based on consideration of zero line loss is provided.
Fig. 1 is a flowchart of a three-phase imbalance calculation method based on consideration of zero line loss according to an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:
step S101, acquiring basic data;
step S102, building a platform area calculation model according to the basic data;
step S103, calculating the current of the phase A of each section of the conducting wire and the voltage of the phase A of the tail end node by adopting the transformer area calculation model;
step S104, calculating the current of the B phase of each section of the conducting wire and the voltage of the B phase of the tail end node by adopting the distribution room calculation model;
step S105, calculating the C-phase current of each section of the conducting wire and the C-phase voltage of the tail end node by adopting the transformer area calculation model;
and step S106, calculating loss of each section of wire, zero line current and three-phase unbalance degree of the transformer area at least according to part or all of the A-phase current of each section of wire, the A-phase voltage of the tail end node, the B-phase current of the wire, the B-phase voltage of the tail end node, the C-phase current of the wire and the C-phase voltage of the tail end node.
Specifically, the basic data includes:
A. the head end of the platform area: the name, the line, the transformer substation, the daily active electric quantity, the reactive electric quantity, the average value of the daily phase voltage of the three phases at the head end and the 24-hour current of the three phases at the head end;
B. a feeder section: the line warp, the type, the length and the line type;
C. case: name and access location;
D. the user: name, asset number, access phase, daily power reading;
E. the user gives a user line: the line warp, the type, the length and the line type.
In the scheme, the accurate calculation of three-phase unbalance based on consideration of zero line loss is realized by acquiring basic data, constructing a platform area calculation model according to the basic data, calculating the A-phase current and the A-phase voltage of each section of wire, the B-phase current and the B-phase voltage of each section of wire, the C-phase current and the C-phase voltage of each section of wire by adopting the platform area calculation model, and calculating the loss of each section of wire, zero line current and platform area three-phase unbalance.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
In an embodiment of the present application, calculating the phase a current and the phase a voltage of the end node of each segment of the conducting wire by using the above-mentioned platform area calculation model includes: calculating the phase A current of each section of the conducting wire from the tail end to the head end by using initial voltage; calculating the phase voltage of the tail end node A of each section of the conducting wire by using the phase current A of each section of the conducting wire; comparing the voltage of the end node A of each section of the wire with the voltage of the end node A of the wire obtained by the last calculation to obtain the maximum value of voltage deviation; judging whether the calculation is convergent according to the maximum value of the voltage deviation calculated in two nearest adjacent times; step five, if convergence occurs, storing the phase current A of each section of the conducting wire and the phase voltage A of the tail end node; and step six, if the convergence is not achieved, repeating the step one to the step four until the convergence is achieved. Accurate calculation of the A-phase current of each section of the wire and the A-phase voltage of the tail end node is achieved.
In an embodiment of the present application, calculating the phase a current of each segment of the conducting wire includes: calculating the end user A-phase current by adopting a first formula, wherein the first formula is expressed as follows:
wherein, I represents the A phase current of the end user, A represents the low-voltage A phase user electricity quantity, T represents the power supply time, U represents the A phase voltage,
representing a head end power factor; and calculating the A-phase currents of all the wires by adopting a second formula, wherein the second formula is expressed as follows:
wherein IA represents the A-phase current of all the wires, and Ia represents the A-phase current of the connected wires or users; and calculating the voltage drop of each section of the conducting wire by adopting a third formula, wherein the third formula is represented as: Δ U ═ Ia × R, where Δ U denotes the voltage drop per wire segment, and R denotes the wire segment resistance;and calculating the terminal voltage of the wire section by adopting a fourth formula, wherein the fourth formula is represented as follows: u end is U head- Δ U, wherein U head represents the voltage at the head end of the wire section, and U end represents the voltage at the tail end of the wire section; and obtaining the A-phase current of each section of the wire according to the terminal voltage of the wire section, the user current and a wire section current calculation formula, and realizing accurate calculation of the A-phase current of each section of the wire.
Optionally, the determining whether the calculation converges according to the maximum voltage deviation values calculated in two nearest adjacent times includes: the maximum value of the voltage deviation calculated in two nearest adjacent times is less than 10-5Determining convergence; the maximum value of the voltage deviation calculated in two nearest adjacent times is greater than or equal to 10-5When it is determined not to converge.
The embodiment of the present application further provides a three-phase imbalance calculating device based on consideration of zero line loss, and it should be noted that the three-phase imbalance calculating device based on consideration of zero line loss according to the embodiment of the present application may be used to execute the three-phase imbalance calculating method based on consideration of zero line loss according to the embodiment of the present application. The three-phase imbalance calculation device based on consideration of zero line loss provided by the embodiment of the application is described below.
Fig. 2 is a schematic diagram of a three-phase imbalance calculation device based on consideration of neutral loss according to an embodiment of the present application. As shown in fig. 2, the apparatus includes:
an acquisition unit 10 for acquiring basic data;
a building unit 20, configured to build a platform region calculation model according to the basic data;
the first calculating unit 30 is configured to calculate a phase a current of each segment of the conducting wire and a phase a voltage of the end node by using the above-mentioned distribution room calculation model;
a second calculating unit 40, configured to calculate, by using the distribution room calculation model, a current of a B-phase of each segment of the conducting wire and a voltage of a B-phase of the end node;
a third calculating unit 50, configured to calculate, using the distribution room calculation model, a C-phase current of each segment of the conducting wire and a C-phase voltage of the end node;
and a fourth calculating unit 60 for calculating loss of each section of the wire, current of the zero line and unbalance of three phases of the platform area at least according to part or all of the current of the phase a of each section of the wire, the voltage of the phase a of the end node, the current of the phase B of the wire, the voltage of the phase B of the end node, the current of the phase C of the wire and the voltage of the phase C of the end node.
In the scheme, the obtaining unit obtains basic data, the building unit builds a platform area calculation model according to the basic data, the first calculation unit calculates the A-phase current and the A-phase voltage of the tail end node of each section of conducting wire by adopting the platform area calculation model, the second calculation unit calculates the B-phase current and the B-phase voltage of the tail end node of each section of conducting wire, the third calculation unit calculates the C-phase current and the C-phase voltage of the tail end node of each section of conducting wire, and the fourth calculation unit calculates the loss of each section of conducting wire, the zero line current and the three-phase unbalance degree of the platform area, so that the three-phase accurate unbalance calculation based on the consideration of the zero line loss is realized.
The three-phase unbalance calculation device considering zero line loss comprises a processor and a memory, wherein the acquisition unit, the construction unit, the first calculation unit, the second calculation unit, the third calculation unit, the fourth calculation unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to be one or more, and accurate calculation of three-phase unbalance based on consideration of zero line loss is achieved by adjusting kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
The embodiment of the invention provides a computer-readable storage medium, which comprises a stored program, wherein when the program runs, a device where the computer-readable storage medium is located is controlled to execute the three-phase imbalance calculation method based on consideration of zero line loss.
The embodiment of the invention provides a processor, which is used for running a program, wherein the program runs to execute the three-phase imbalance calculation method based on consideration of zero line loss.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein when the processor executes the program, at least the following steps are realized:
step S101, acquiring basic data;
step S102, building a platform area calculation model according to the basic data;
step S103, calculating the current of the phase A of each section of the conducting wire and the voltage of the phase A of the tail end node by adopting the transformer area calculation model;
step S104, calculating the current of the B phase of each section of the conducting wire and the voltage of the B phase of the tail end node by adopting the distribution room calculation model;
step S105, calculating the C-phase current of each section of the conducting wire and the C-phase voltage of the tail end node by adopting the transformer area calculation model;
and step S106, calculating loss of each section of wire, zero line current and three-phase unbalance degree of the transformer area at least according to part or all of the A-phase current of each section of wire, the A-phase voltage of the tail end node, the B-phase current of the wire, the B-phase voltage of the tail end node, the C-phase current of the wire and the C-phase voltage of the tail end node.
The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program of initializing at least the following method steps when executed on a data processing device:
step S101, acquiring basic data;
step S102, building a platform area calculation model according to the basic data;
step S103, calculating the current of the phase A of each section of the conducting wire and the voltage of the phase A of the tail end node by adopting the transformer area calculation model;
step S104, calculating the current of the B phase of each section of the conducting wire and the voltage of the B phase of the tail end node by adopting the distribution room calculation model;
step S105, calculating the C-phase current of each section of the conducting wire and the C-phase voltage of the tail end node by adopting the transformer area calculation model;
and step S106, calculating loss of each section of wire, zero line current and three-phase unbalance degree of the transformer area at least according to part or all of the A-phase current of each section of wire, the A-phase voltage of the tail end node, the B-phase current of the wire, the B-phase voltage of the tail end node, the C-phase current of the wire and the C-phase voltage of the tail end node.
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 the like) having computer-usable program code embodied therein.
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.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Examples
The embodiment relates to a specific three-phase imbalance calculation method based on consideration of zero line loss. The method comprises the following steps:
the method comprises the steps that firstly, data of source systems such as an existing PMS/GIS/marketing system and the like are called, the data comprise a platform area name, a belonging line, a belonging transformer substation, a name, a model and a length wiring type of a feeder line section, a meter box name access position, a user name, an asset number and an access phase, a user service wire diameter, a model, a length and a wiring type, and a platform area calculation model is constructed based on the data of the source systems such as the existing PMS/GIS/marketing system and the like;
and step two, acquiring daily active electric quantity and reactive electric quantity of the head end of the transformer area, the average value of daily phase voltage of three phases of the head end, the average current of three phases of the head end for 24 hours by using the acquisition system and the distribution transformer monitoring system, and recording the electric quantity daily by a user.
Step three, firstly calculating the phase current of each section of wire and the phase voltage of the head end node A based on the transformer area calculation model constructed in the step one and the transformer area and user operation data acquired in the step two, and specifically comprising the following steps:
step A: calculating the phase A current of each section of the conducting wire from the tail end to the head end;
and B: and calculating the A phase voltage of the tail end node of each section of the wire by using the A phase current of each section of the wire.
And C: comparing the voltage of each node with the last calculated voltage value to find out the maximum value of the voltage deviation;
step (ii) ofD: comparing the calculated voltage deviation maximum values twice to judge whether the calculation is convergent or not, wherein the judgment standard is whether the difference value of the voltage deviation maximum values twice is less than 10-5。
Step E: if the maximum value of the voltage deviation obtained by two calculations is less than 10-5And if so, considering the calculation convergence, and archiving the phase A current of each section of the conducting wire and the phase A voltage of the first node and the last node.
Step F: if the maximum value of the voltage deviation obtained by two calculations is not less than 10-5And D, judging that the calculation is not converged, repeatedly executing the steps A to D until the calculation is converged, and archiving the phase A current of each section of the conducting wire and the phase A voltage of the first node and the last node.
And step four, calculating the phase B current and the voltages of the first node and the last node according to the process of the step three.
And step five, calculating the phase C current and the voltages of the first node and the last node according to the process of the step three.
And step six, calculating the loss of each section of the lead, the zero line current and the three-phase unbalance degree.
The sixth step comprises:
1. the zero line current calculating method comprises the following steps:
after the three-phase current of each section of wire is calculated, the zero line current can be calculated according to the following formula:
2. the total loss calculation method of the transformer area comprises the following steps:
after the three-phase current and the zero line current are calculated, the total loss can be calculated:
k represents a load shape factor;
Rirepresenting the resistance (omega) of the ith lead (if the resistances of the leads of the phase line and the zero line are different, the losses of the phase line and the zero line are calculated separately and then added together);
t represents the power supply time (h).
3. Three-phase unbalance calculation method
For three-phase imbalance, only line loss and transformer copper loss are calculated on the assumption that the calculation grid structure and load are unchanged, and the operation mode is unchanged after imbalance optimization, and hysteresis loss and eddy current loss of the transformer and loss change of power equipment such as reactive compensation devices are not considered. First, the definition of the phase current imbalance is introduced as follows:
wherein, IaRepresenting the maximum value of the effective values of the three-phase currents, IavAnd represents the average value of the three-phase current effective values.
Therefore, in the original operation state, the three-phase current of the feeder line can be represented by the magnitude of the three-phase current value and the phase angle of each phase current, and the representation method is as follows:
wherein, betaA、βB、βCRespectively represent the unbalance degrees of the three-phase current,
respectively representing three-phase currents in ampere (A),
respectively representing the phase angle of three-phase current, IavAnd the average value of the effective values of the three-phase current is expressed in ampere (A). All the data can be acquired by a three-phase unbalance monitoring device.
The unbalance degree of the distribution transformer outlet current is as follows:
β0＝max{βA，βB，βC}，
the above steps are only descriptions of preferred implementation manners of the present invention, and in the current DL686-2018T _ power grid electric energy loss calculation guide rule, a full-phase theoretical line loss calculation algorithm for the platform area three-phase imbalance calculation is not included yet, that is, theoretical line loss results calculated by assuming that three phase lines of the platform area are in a balanced state. However, in the actual wiring of the power grid, a three-phase balanced state is almost impossible to occur in a transformer area, and a certain zero line loss is generated due to unbalanced three-phase load, so that the actual access phase information and the actual measured current or electric quantity information of the transformer area are combined to perform the all-phase theoretical line loss calculation considering the zero line loss, so that the actual situation of the transformer area can be more approximate to the actual situation of the site, the three-phase unbalanced state of each area such as a main line, a branch line and the like of the transformer area can be reflected through the calculation result, and the three-phase unbalanced optimization analysis of a basic unit of. The three-phase unbalance algorithm of the system firstly provides a calculation logic considering zero line loss, is better than the algorithm logic for calculating guide rules, and is an innovation in the aspect of theoretical line loss calculation of a transformer area.
From the above description, it can be seen that the above-described embodiments of the present application achieve the following technical effects:
1) according to the three-phase unbalance calculation method considering the zero line loss, the basic data are obtained, the transformer area calculation model is built according to the basic data, the transformer area calculation model is adopted to calculate the A-phase current and the A-phase voltage of the tail end node of each section of wire, the B-phase current and the B-phase voltage of the tail end node of each section of wire, the C-phase current and the C-phase voltage of the tail end node of each section of wire, and then the loss of each section of wire, the zero line current and the three-phase unbalance degree of the transformer area are calculated, so that the three-phase unbalance based on considering the zero line loss is accurately calculated.
2) The three-phase unbalance calculation device based on consideration of zero line loss comprises an acquisition unit, a construction unit, a platform area calculation model, a first calculation unit, a second calculation unit, a third calculation unit, a fourth calculation unit and a third calculation unit, wherein the construction unit is used for constructing a platform area calculation model according to basic data, the first calculation unit is used for calculating the A-phase current of each section of wire and the A-phase voltage of a tail end node, the second calculation unit is used for calculating the B-phase current of each section of wire and the B-phase voltage of the tail end node, the third calculation unit is used for calculating the C-phase current of each section of wire and the C-phase voltage of the tail end node, and the fourth calculation unit is used for calculating the loss of each section of wire, the zero line current and.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A three-phase unbalance calculation method based on consideration of zero line loss is characterized by comprising the following steps:
acquiring basic data;
building a platform area calculation model according to the basic data;
calculating the current of the A phase of each section of the conducting wire and the voltage of the A phase of the tail end node by adopting the transformer area calculation model;
calculating the current of the B phase of each section of the conducting wire and the voltage of the B phase of the tail end node by adopting the transformer area calculation model;
calculating the C-phase current of each section of the conducting wire and the C-phase voltage of the tail end node by adopting the transformer area calculation model;
and calculating loss of each section of the wire, zero line current and three-phase unbalance degree of the transformer area at least according to part or all of the A-phase current of each section of the wire, the A-phase voltage of the tail end node, the B-phase current of the wire, the B-phase voltage of the tail end node, the C-phase current of the wire and the C-phase voltage of the tail end node.
2. The method of claim 1, wherein calculating the phase a current and the phase a voltage of the end node for each segment of the conductor using the region calculation model comprises:
calculating the phase A current of each section of the conducting wire from the tail end to the head end by using initial voltage;
calculating the phase voltage of the tail end node A of each section of the conducting wire by using the phase current A of each section of the conducting wire;
comparing the voltage of the A-phase of the tail end node of each section of the wire with the voltage of the A-phase of the tail end node of the wire obtained by the last calculation to obtain the maximum value of voltage deviation;
judging whether the calculation is convergent according to the maximum value of the voltage deviation calculated in two nearest adjacent times;
step five, if convergence occurs, storing the phase A current of each section of the conducting wire and the phase A voltage of the tail end node;
and step six, if the convergence is not achieved, the steps one to four are repeatedly executed until the convergence is achieved.
3. The calculation method according to claim 1, wherein calculating the phase-a current of each segment of the wire comprises:
calculating the end user A-phase current by adopting a first formula, wherein the first formula is expressed as:
calculating the A-phase currents of all the wires by adopting a second formula, wherein the second formula is expressed as:
wherein IA represents all the wires A phase current, and Ia represents the connected wires or user A phase current;
calculating the voltage drop of each section of the wire by adopting a third formula, wherein the third formula is expressed as: Δ U ═ Ia × R, where Δ U represents the voltage drop per wire segment and R represents the wire segment resistance;
calculating the terminal voltage of the wire section by adopting a fourth formula, wherein the fourth formula is expressed as: u end is U head- Δ U, wherein U head represents the voltage at the head end of the wire section, and U end represents the voltage at the tail end of the wire section;
and obtaining the A-phase current of each section of the wire according to the tail end voltage of the wire section, the user current and a wire section current calculation formula.
4. The calculation method according to claim 2, wherein determining whether the calculation converges according to the maximum voltage deviation values calculated in two nearest neighbors comprises:
the maximum value of the voltage deviation calculated in two nearest adjacent times is less than 10-5Determining convergence;
the maximum value of the voltage deviation calculated in two nearest adjacent times is greater than or equal to 10-5When it is determined not to converge.
5. A device for calculating three-phase imbalance based on consideration of zero line loss, comprising:
an acquisition unit configured to acquire basic data;
the building unit is used for building a platform area calculation model according to the basic data;
the first calculation unit is used for calculating the current of the phase A of each section of conducting wire and the voltage of the phase A of the tail end node by adopting the distribution room calculation model;
the second calculation unit is used for calculating the current of the B phase of each section of the conducting wire and the voltage of the B phase of the tail end node by adopting the distribution room calculation model;
the third calculation unit is used for calculating the C-phase current of each section of the conducting wire and the C-phase voltage of the tail end node by adopting the distribution area calculation model;
and the fourth calculation unit is used for calculating loss of each section of the conducting wire, zero line current and platform area three-phase unbalance degree at least according to part or all of the A-phase current of each section of the conducting wire, the A-phase voltage of the tail end node, the B-phase current of the conducting wire, the B-phase voltage of the tail end node, the C-phase current of the conducting wire and the C-phase voltage of the tail end node.
6. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein when the program runs, the computer-readable storage medium is controlled to execute the method for calculating three-phase imbalance based on consideration of zero-line loss according to any one of claims 1 to 4.
7. A processor, characterized in that the processor is configured to run a program, wherein the program is run to perform the method of any one of claims 1 to 4 based on a three-phase imbalance calculation taking into account neutral losses.
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