CN105718583B - Interface conversion method for PFO data format and XLS - Google Patents
Interface conversion method for PFO data format and XLS Download PDFInfo
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Abstract
The invention provides an interface conversion method of a PFO data format and XLS, which is characterized in that a PFO format file exported by BPA software is read in a program, a power flow calculation result of the BPA is positioned and rearranged, and is exported to the XLS file, so that the problems that the information amount in the power flow calculation result is large and the required key information is difficult to obtain intuitively after power system analysis software BPA is generally applied in a power system are solved, and the interface conversion method has strong engineering practicability.
Description
Technical Field
The invention belongs to the field of electric power system analysis application, and particularly relates to an interface conversion method between a PFO data format and an XLS data format derived from BPA software.
Background
PSD-BPA trend and transient stability and human-computer interface programs based on a Windows operating system are widely applied to departments of planning and designing, running and scheduling, teaching and scientific research and the like of an electric power system since the introduction of the PSD-BPA trend and transient stability and human-computer interface programs in 1997. With the large number of practical applications of the BPA program in foreign and domestic countries, people continuously put forward new requirements on the continuous development and perfection of the program, so that BPA is newly developed in the United states and China.
The BPA software package mainly comprises a trend and transient stability program and has the characteristics of large calculation scale, high calculation speed, good numerical stability, strong function and the like. The main functions of the load flow calculation program are as follows: a basic power flow calculation function, which calculates voltage, power and the like; self-defining an output function; a load static characteristic simulation function; a generator power characteristic control function; a node P-V, P-Q, Q-V curve calculation function; analyzing the sensitivity of nodes, lines and loss; n-1 switching on and off simulation; and (4) regional tie line power control. Transient stability procedures are powerful tools for analyzing the dynamic behavior of a power system when it is subjected to various disturbances at steady state. Can be used to simulate the operation and control of an electric power system; calculating short-circuit current; the research on extra-high voltage direct current transmission, wind power, FACTS devices and the like has wide functions in the aspect of large power grid stability analysis and calculation.
Currently, the computational scale on which BPA can be realized is already large and is still growing rapidly. The number of nodes reaches 20000, and the number of branches can reach 80000; in terms of accommodation of the direct current lines, it may include 100 direct current lines and 50 multi-segment direct current lines; more than 100 switched power regions may be included, 300 partitions, and 500 power switching ties may be included between partitions.
The BPA software package has a remarkable characteristic that BPA network data is input in a card form, the data must be strictly input according to a specified format, and otherwise, the software cannot identify the data. The exchange node data card usually fills in a B card, and the selectable node types are a PQ node, a PV node and a V theta node. The line data card is usually an L card, and the per unit values of rated current and resistance, reactance, ground-to-ground electric conduction G/2 and ground-to-ground electric conduction B/2 are required to be filled. The transformer data card generally adopts a T card or an R card, and the per unit values and the transformation ratios of rated capacity, equivalent resistance R, leakage reactance X, equivalent conductance G and excitation susceptance B need to be filled.
The PSD-BPA software has strong operability and an intimate human-computer interaction interface, which makes the PSD-BPA software increasingly popular in power systems. Many power companies and research institutes use BPA software to build power grid models of different regions for simulation research, and when power grid load flow calculation results of the regions are analyzed, load flow calculation results stored in a PFO data format of a power grid need to be derived from the BPA software. And the power flow calculation result stored in the PFO data format comprises the output of each generator, the power flow on each line and the power flow flowing through each transformer.
However, the most important concern of power system operators is the loss and weak links of each partition of the power grid, such as voltage out-of-range nodes, lines with high load rate, transformers and the like. If the indexes which are relatively concerned by the staff are extracted from the PFO files one by one to the XLS files by a manual method, a large amount of work is needed, not only is the time consumption long and the efficiency low, but also various errors are easy to occur, and the waste of manpower and material resources is caused. Therefore, an intelligent interface conversion method is sought, and it is very necessary to extract important information in the PFO format data into an XLS file with a neat, concise and clear format.
Disclosure of Invention
The invention aims to provide an interface conversion method of a PFO data format and XLS, which aims to solve the problems that the PFO file redundant information of a BPA load flow calculation result is more and the required key information is difficult to obtain intuitively.
In order to achieve the purpose, the invention adopts the following technical scheme:
1) reading a PFO (Power flow calculation) file of a power system analysis platform BPA (Business Process analysis) in a program;
2) after the step 1), extracting available information of the load flow calculation result;
3) and storing the available information obtained by extraction into an XLS data format.
The program is selected from a compiler with file reading capability, such as a C + + program.
The step 2) specifically comprises the following steps:
determining the starting position and the ending position of a data list containing available information in the PFO file, and then extracting and storing corresponding available information into a structure body array according to the structure of the data list.
The starting position of the data list is determined by matching the characteristic character string (with uniqueness) of the specific position in the row of the head of the data list.
The method for judging the end position of the data list comprises the following steps: if the data list is a continuous list without empty rows, the end position of the continuous list is reached when the data list is read to the first empty row from the initial position; if the data list is a discontinuous list containing empty rows, the end position of the discontinuous list is reached when the content of the next data list is read from the starting position.
The data list includes one or more of a voltage out-of-range list, a system loss data list, a heavy haul line list, and a heavy haul transformer list.
The available information includes one or more of voltage out-of-range information, system loss information, heavy duty line information, and heavy duty transformer information.
The invention has the beneficial effects that:
the PFO data format and XLS interface conversion method can be used as an interface program, so that BPA software and various kinds of software capable of identifying XLS file formats are effectively combined, the method can be applied to the fields of planning and operation of a power grid and the like, calculation is more convenient, and the method has engineering practical value.
Further, when weak links of a power grid are analyzed or network loss is calculated, search needs to be conducted in a PFO file of a BPA load flow calculation result. If manual statistical information is used, not only is it difficult to quickly locate the required information, but also it is time consuming and error prone. According to the method, a large amount of unnecessary information parts such as control sentences in a PFO (Power flow Performance) file of a BPA (Business platform) load flow calculation result and the distribution of the load flow on each line are skipped, the key information which is concerned by power system workers and positioned in a voltage out-of-range list, a partition loss list, a heavy-load line list and a heavy-load transformer list is quickly, accurately and effectively introduced into an XLS file with a regular format, manual statistics information is not needed, the calculation efficiency is greatly improved, and the method has strong engineering practicability.
Drawings
Fig. 1 is a flow chart of an interface conversion method according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples. Taking power flow calculation as an example, the invention has generality.
A data file (DAT format) needing to be calculated is opened in power system analysis software PSD-BPA (BPA), and a path where a BPA program is located and an execution path of the data file are set. And then executing a BPA flow program, and if the flow calculation result is converged, generating a PFO (flow calculation result) file at the execution path of the data file. The PFO file includes all information of the power flow calculation result, such as convergence of the power flow result, power flow on each line of the network frame to be solved, voltage of each node, power flow on each transformer, and the like. Since the PFO file is automatically generated by BPA software and the format is fixed, it is difficult for power system staff to intuitively find the required key information, and therefore the PFO file needs to be converted. The following provides a format conversion method of PFO files exported by BPA software to XLS files in an orderly format. The following is a detailed description:
PFO File export
Exporting the PFO file in the BPA software is to prepare for data format conversion, and the correctness of data export is directly related to the correctness and accuracy of the subsequent data format conversion. The basic steps for exporting PFO files are as follows:
1) opening a DAT file required to be calculated in BPA software, setting a path of the BPA software and a path of the DAT file, and adjusting an output control statement in the DAT file to enable the information storage format in a calculation result file to be a specified format. The given output control statement is shown in table 1:
TABLE 1
2) And clicking a button for executing a BPA power flow program in BPA software after preparation is made, completing power flow calculation of the DAT file of the input data by the BPA at the moment, and storing all information of a power flow calculation result into a newly generated PFO file under a path where the DAT file is located.
3) The obtained PFO file is renamed to be 'result', and then the export work of the PFO file is completed.
PFO File Format conversion
After the above PFO file is obtained, it is subjected to format conversion. The invention utilizes C + + program to write interface conversion program, the flow is as shown in figure 1, the concrete steps are as follows:
a. and completing the positioning of the voltage out-of-range list, wherein the positioning is realized by judging whether the 1 st character to the 5 th character of a certain line in the PFO format data is 'low'. Under a given output control statement, the head of the voltage out-of-range list is a ". low voltage and overvoltage node data list" to which the identification of five characters in a specific position ". low" can be uniquely located.
In the voltage out-of-range list, the partition names of the voltage out-of-range nodes are in columns 12-13, the node names are in columns 18-25, the rated voltage of the nodes are in columns 27-32, the node types are in columns 35, the actual voltages of the nodes are in columns 42-47, the voltage per unit value of the nodes is in columns 50-55, the lower limit of the voltage is in columns 60-65, the upper limit of the voltage is in columns 68-73, and the information (indicating the positive and negative of the out-of-range voltage value) for marking the voltage is higher or lower is in columns 78-84. According to the difference of partition names, the number of voltage out-of-range nodes can be counted in a partition mode through distinguishing the partition names, and the number of low-voltage nodes and high-voltage nodes can be counted through judging 78 th column characters (the column characters are minus or plus, if the column characters are minus, the voltage is low, and if the column characters are plus, the voltage is high).
b. After the number of the out-of-range voltage nodes of each partition is obtained, a plurality of structure body arrays can be defined, and the size of each structure body array is the number of the out-of-range voltage nodes of the partition. The members of the structure body comprise a partition name, a node rated voltage, a node type, a node actual voltage, a node voltage per unit value, a voltage lower bound, a voltage upper bound and an out-of-bound voltage value. And storing the voltage out-of-range information of each partition one by using the defined structure array.
c. And completing the positioning of the system loss data list, wherein the positioning is realized by judging whether the 6 th character to the 9 th character of a certain line in the PFO format data is the score or not. Under a given output control statement, the head of the system loss data list is a system loss data list in a partition order, and the list can be uniquely located through the identification of four characters in a specific position of the system loss data list.
In the system loss data list, the partition names are in columns 4-5, the numbers of the four characters occupying columns 12-15 are in a 'small knot' shape, the active loss of a line is in columns 29-35, the reactive loss of the line is in columns 37-43, the active loss of a transformer is in columns 48-54, the reactive loss of the transformer is in columns 57-63, the active loss of a direct current converter is in columns 67-73, the reactive loss of the direct current converter is in columns 77-83, the total active loss in the partition is in columns 86-92 and the total reactive loss in the partition is in columns 96-102, and according to the difference of the partition names, the different types of loss in each partition can be counted through distinguishing the partition names.
d. And defining a structure array for storing the system loss of each partition, wherein the size of the structure array represents the number of the partitions. The members of the structure body comprise partition names, small nodes, line active loss, line reactive loss, transformer active loss, transformer reactive loss, direct current converter active loss, direct current converter reactive loss, total active loss and total reactive loss in corresponding partitions. And storing the system loss information of each partition one by using the structure array.
e. The location of the reloading route list is completed by judging whether the characters 6-9 of a certain line in the PFO format data are 'way negative'. Under a given output control statement, the head of the heavy load line list is a data list of line loads exceeding 80.0% of the rated value, and the list can be uniquely located through the identification of four characters of line loads at specific positions.
In the heavy load line list, the name of a head end node of the line is in columns 4-11, the voltage of the head end node is in columns 12-18, the name of an end node of the line is in columns 19-26, the voltage of the end node is in columns 27-33, the current of the line is in columns 37-44, the rated current is in columns 46-53, the current ratio is in columns 56-63, the apparent power is in columns 64-71, the rated apparent power is in columns 73-80, the apparent power ratio is in columns 87-92, the power factor is in columns 94-101, and the angle is in columns 102-108.
f. After the number of the heavy load lines is obtained through statistics, a structure array for storing the information of the heavy load lines can be defined, and the size of the structure array is the number of the heavy load lines. The structure members include a head end node name, a head end node voltage, an end node name, an end node voltage, a line current, a rated current, a current ratio, an apparent power, a rated apparent power, an apparent power ratio, a power factor, and an angle. And storing the heavy load circuit information one by using the structure array.
g. And completing the positioning of the heavy-duty transformer list, wherein the positioning is realized by judging whether the 8 th character to the 11 th character of a certain line in the PFO format data is 'machine negative'. Under a given output control statement, the head of the list of heavy-duty transformers is a data list ". about 80.0% of rated value of transformer load", which list can be uniquely located by identifying four characters in which a specific position "machine negative".
In the heavy-duty transformer list, the name of an A-side node is in the 4 th to 11 th columns, the name of an A-side node is in the 12 th to 18 th columns, the name of a B-side node is in the 19 th to 26 th columns, the name of a B-side node is in the 27 th to 33 th columns, the apparent power is in the 35 th to 42 th columns, the rated apparent power is in the 46 th to 52 th columns, the power ratio is in the 56 th to 61 th columns, and the power factor is in the 64 th to 69 th columns.
h. After the number of the heavy-duty transformers is obtained through statistics, a structure body array used for storing the information of the heavy-duty transformers can be defined, and the size of the structure body array is the number of the heavy-duty transformers. The structural body members comprise an A-side node name, an A-side node voltage, a B-side node name, a B-side node voltage, apparent power, rated apparent power, apparent power proportion and power factors. And storing the heavy-load transformer information one by using the structure array.
i. Determination of the end of a certain data list: in the above list, if the list is a continuous list (i.e. a list containing no empty row), the reading of the continuous list is finished when the empty row is encountered; if the list is a non-contiguous list (i.e., a list containing empty rows), then the reading of the non-contiguous list ends when the next list content is encountered.
Based on the structure, the structure array respectively storing the voltage out-of-range information, the system loss information, the heavy-load line information and the heavy-load transformer information is obtained. And respectively exporting the information stored in each structure array to different XLS files, namely completing the conversion of the format of the PFO file into the XLS.
Claims (2)
1. A PFO data format and XLS interface conversion method is characterized in that: the method comprises the following steps: opening a DAT file required to be calculated in BPA software, setting a path where the BPA software is located and a path where the DAT file is located, and adjusting an output control statement in the DAT file to enable the information storage format in a calculation result file to be a specified format;
clicking a button of 'executing BPA power flow program' in BPA software, finishing power flow calculation on an input data DAT file by the BPA at the moment, and storing all information of a power flow calculation result into a newly generated PFO file under a path where the DAT file is located;
after a PFO file used for recording a load flow calculation result is read in a compiler with file reading capacity, determining the initial position of a data list by matching the characteristic character string of a data list header containing available information in the PFO file at a specific position under a given output control statement; judging the end position of the data list: if the data list is a continuous list without empty rows, the end position of the continuous list is reached when the data list is read to the first empty row from the initial position, and if the data list is a discontinuous list with empty rows, the end position of the discontinuous list is reached when the content of the next data list is read from the initial position;
the data list comprises one or more of a voltage out-of-range list, a system loss data list, a heavy-load line list and a heavy-load transformer list, available information of the load flow calculation result is judged and extracted according to a data list structure, and corresponding available information is extracted and stored into a structure body array; and storing the available information obtained by extraction into an XLS data format.
2. The PFO data format to XLS interface conversion method of claim 1, wherein: the available information includes one or more of voltage out-of-range information, system loss information, heavy duty line information, and heavy duty transformer information.
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