JP2010048707A - Harmonic component analyzer and control program for harmonic component analysis - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a harmonic component analyzer which analyzes harmonic components effectively for respective parallel input patterns of a plurality of generators. <P>SOLUTION: The harmonic component analyzer 100 incudes: a memory section for storing a first data set representing a mutual connection in a power system, a second data set containing parallel input separation states of the plurality of generators and a third data set containing a separation attribute value in the separation states and a parallel input attribute value; a first extracting means 105A for sequentially extracting the parallel input separation states from the second data set; a second extracting means 105B for extracting the parallel input attribute value and the separation attribute value from the third data set; an analysis means 105C for analyzing the harmonic components, by utilizing an analysis program on the basis of the first data set; and a first repeating means 105E for repeatedly bringing the first extracting means 105A, the second extracting means 105B and the analysis means 105C to function for each parallel input pattern. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a harmonic analysis apparatus and a harmonic analysis control program for analyzing harmonics using an analysis program for analyzing harmonics, and more particularly to efficiently generating harmonics for each parallel pattern of a plurality of generators. The present invention relates to a harmonic analysis apparatus for analyzing waves and a control program for harmonic analysis.

  In power systems including generators and semiconductor devices, harmonic voltage distortion and harmonic current distortion occur in the power system when the connection state (parallel state) of the generators and semiconductor devices is changed. Sometimes. And the harmonics generated in the electric power system including a plurality of generators can be analyzed by using, for example, a harmonic analysis program. In addition, techniques for analyzing harmonics and techniques for reducing the influence of generated harmonic components have been proposed.

  Japanese Patent Laid-Open No. 11-94887 (Patent Document 1) discloses a real-time harmonic analysis apparatus. According to Japanese Patent Laid-Open No. 11-94887 (Patent Document 1), the real-time harmonic analysis apparatus is based on sampling means for sampling a waveform having a fundamental frequency constant in time, and each sampling data sampled by the sampling means. Spectrum calculating means for calculating a discrete Fourier spectrum corresponding to the harmonic component of each order from the Fourier data string. The spectrum calculation means is a discrete Fourier spectrum based on a Fourier data sequence obtained by adding Fourier data corresponding to the latest sampling data to a Fourier data sequence excluding the oldest Fourier data of the previous one period of Fourier data sequences. Is calculated.

  Japanese Patent Laying-Open No. 11-69631 (Patent Document 2) discloses a power generation system and a method for controlling the power generation system. According to Japanese Patent Laid-Open No. 11-69631 (Patent Document 2), a power generation system includes a DC power generation device, a power conversion device that converts DC power of the DC power generation device into AC power, and an output from the power conversion device. Connecting means for connecting to the power distribution system via an insulating transformer, and connecting to the power distribution system by the connecting means when the output of the DC power generator is established. In the power generation system, a filter that removes harmonic components generated from the power conversion device is provided between the insulation transformer and the power conversion device, and the control unit of the connection unit compares the voltage of the distribution system and the voltage command value. A comparator and a power supply phase synchronization system that reads the feedback signal of the distribution system voltage are provided, and when the voltage of the distribution system matches the voltage command value and phase, the connection means is closed, and the current command value of the power converter Is raised over time.

Kenji Yukihira, “Development of Harmonic Source Distribution Estimation Program”, [online], May 11, 1999, Central Research Institute of Electric Power Industry, Research Report, [Search July 23, 2008], On the Internet <URL: http://criepi.denken.or.jp/jp/kenkikaku/cgi-bin/report_download.cgi?download_name=T98043&report_cde=T98043>, as a harmonic analysis technique, for example, a calculation program for the H method Etc. are disclosed.
Japanese Patent Laid-Open No. 11-94887 JP-A-11-69631 Yukihira Kenji, “Development of Harmonic Source Distribution Estimation Program”, [online], May 11, 1999, Central Research Institute of Electric Power Industry, Research Report, [Search July 23, 2008], Internet < URL: http://criepi.denken.or.jp/jp/kenkikaku/cgi-bin/report_download.cgi?download_name=T98043&report_cde=T98043>

  In an electric power system including a large number of generators such as a hydraulic trunk line, there are many parallel patterns of generators, and in the parallel patterns of these generators, harmonic current distortion and harmonic current distortion are large. There is a possibility that a juxtaposed pattern exists.

  However, conventional analyzers and analysis programs for analyzing harmonics accept a generator parallel insertion pattern and harmonic order in the power system from the user, and analyze harmonics corresponding to them. Do. Therefore, it takes a long time for a user to analyze harmonics for a large number of parallel patterns or a large number of dimensions using a conventional analyzer or analysis program.

  The present invention has been made to solve the above problems, and a main object of the present invention is to analyze a harmonic efficiently for each parallel pattern of a plurality of generators and a harmonic. It is to provide a control program for analysis.

  According to an aspect of the present invention, a harmonic analysis apparatus that analyzes harmonics in a power system using an analysis program for analyzing harmonics is provided. The harmonic analysis apparatus associates first data indicating a mutual connection relationship in a power system including a plurality of generators and circuit elements, and a parallel arrangement state of each of the plurality of generators with a parallel pattern. Memory for storing second data to be stored, and third data for storing the first attribute value in the juxtaposed state and the second attribute value in the disconnected state in association with each of the plurality of generators A first extraction means for sequentially extracting each of the plurality of generators corresponding to the insertion pattern from the second data, and each of the plurality of generators extracted Second extraction means for extracting, from the third data, a first attribute value corresponding to the generator in the parallel state and a second attribute value corresponding to the generator in the disconnected state from the third data; Extracted by using an analysis program based on the first data Analysis means for analyzing harmonics based on the first attribute value and the second attribute value, and a first extraction means, a second extraction means, and an analysis means that repeatedly function for each insertion pattern. And repeating means.

  Preferably, the analysis unit calculates a constant related to the power system necessary for the analysis of the harmonics according to the order for the insertion pattern and the order of the harmonics by using the analysis program based on the first data. The harmonics are analyzed based on the extracted first attribute value and second attribute value. The harmonic analysis apparatus further includes a second repetition unit that causes the analysis unit to repeatedly function for each harmonic order.

  Preferably, a memory | storage part memorize | stores the 4th data which stores the analysis result of a harmonic for every insertion pattern and every order of a harmonic. The analyzing means stores the harmonic analysis result in the fourth data. The harmonic analysis apparatus further includes output means for referring to the fourth data and simultaneously outputting an analysis result for each insertion pattern for each order.

  If another situation of this invention is followed, the control program for harmonic analysis for making a computer analyze the harmonic in an electric power system by utilizing the analysis program for analyzing a harmonic will be provided. The computer stores first data indicating a mutual connection relationship in a power system including a plurality of generators and circuit elements, and a parallel arrangement state of each of the plurality of generators in association with a parallel pattern. A storage unit that stores the second data and the third data that stores the first attribute value in the juxtaposed state and the second attribute value in the disconnected state in association with each of the plurality of generators. . The analysis control program extracts, from the second data, the parallel arrangement state of each of the plurality of generators corresponding to the parallel pattern from the second data, and the parallel insertion of each of the extracted plurality of generators. Extracting a first attribute value corresponding to the generator in the parallel state and a second attribute value corresponding to the generator in the disconnected state from the third data based on the disconnected state; Using the analysis program based on the data, the step of analyzing harmonics based on the extracted first attribute value and second attribute value is executed. The analysis control program causes the computer to repeatedly execute the step of extracting the juxtaposed sequence state, the step of extracting the attribute value, and the step of analyzing for each of the juxtaposition patterns.

  Preferably, in the analyzing step, by using an analysis program based on the first data, a constant related to the power system necessary for the analysis of the harmonic is calculated according to the order with respect to the insertion pattern and the order of the harmonic. And analyzing harmonics based on the extracted first attribute value and second attribute value. The harmonic analysis control program causes the computer to repeatedly execute the analyzing step for each harmonic order.

  Preferably, a memory | storage part memorize | stores the 4th data which stores the analysis result of a harmonic for every insertion pattern and every order of a harmonic. The step of analyzing includes the step of storing the analysis result of the harmonic in the fourth data. The harmonic analysis control program causes the computer to further execute a step of referring to the fourth data and simultaneously outputting an analysis result for each insertion pattern for each order.

  As described above, according to the present invention, a harmonic analysis apparatus and a harmonic analysis control program for efficiently analyzing harmonics for each of the parallel patterns of a plurality of generators are provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals, and detailed descriptions of the parts are not repeated when the names and functions of the parts are the same.

<Definition of terms>
The “output” is a concept including not only an operation of performing display and printing based on data and signals but also an operation of providing at least data and signals to other programs and devices. That is, “output” is a concept including an operation of transferring data to another application in the computer and an operation of transmitting data via a network.

  “Accept” or “input” refers to an operation for acquiring at least data and signals. The arithmetic processing unit is not only an operation for accepting information from a human by a keyboard, a mouse, a voice input device, or the like. The concept includes an operation of receiving data and signals from other programs and other media. That is, “accept” and “input” are concepts including an operation of accepting data from another application inside the computer and an operation of receiving data from outside the computer via a network.

<Hardware configuration>
FIG. 1 is a perspective view showing a computer 100 which is an example of a harmonic analysis apparatus according to the present embodiment. Referring to FIG. 1, a computer 100 includes a computer main body 101 including an FD (Flexible Disk) driving device 111 and a CD-ROM (Compact Disk-Read Only Memory) driving device 113, a monitor 102, a keyboard 103, and the like. And mouse 104.

  FIG. 2 is a control block diagram illustrating a hardware configuration of a computer 100 that is an example of the harmonic analysis apparatus according to the present embodiment. Referring to FIG. 2, in addition to the above-described FD driving device 111 and CD-ROM driving device 113, the computer main body 101 includes a CPU (Central Processing Unit) 105 and a RAM (Random) connected to each other via an internal bus 108. a memory 106 such as an access memory, a fixed disk 107 such as an HDD (Hard Disk Drive), and a communication interface 109. The FD 112 is attached to the FD driving device 111. A CD-ROM 114 is attached to the CD-ROM drive 113.

  The monitor 102 is composed of a liquid crystal panel and a CRT, and displays information output by the CPU 105. The keyboard 103 receives information from the user by key input. The mouse 104 receives information from the user when clicked or slid. The memory 106 stores various types of information. For example, the memory 106 temporarily stores data necessary for executing a program in the CPU 105. The fixed disk 107 stores a program executed by the CPU 105 and a database.

  The CPU 105 controls each element of the computer 100 and is a device that performs various calculations. Further, as will be described later, the CPU 105 performs harmonic analysis processing in the target power system based on the analysis program read out to the memory 106. The CPU 105 stores the analysis processing result in a predetermined area of the memory 106, outputs the processing result to the monitor 102 via the internal bus 108, and transmits it to an external device via the communication interface 109.

  The communication interface 109 converts information output from the CPU 105 into an electrical signal, that is, a device that converts information output from the CPU 105 into a signal that can be used by other devices. The communication interface 109 is also a device that receives a signal input from the outside of the computer 100 according to the present embodiment and converts it into information that can be used by the CPU 105. Further, the computer 100 can be connected to another output device such as a printer as necessary.

  As already described, the harmonic analysis apparatus and harmonic analysis processing according to the present embodiment are realized by hardware such as the computer 100 and software such as a control program. Generally, such software is stored in a recording medium such as the FD 112 or the CD-ROM 114, or distributed via a network or the like. The software is read from the recording medium by the FD driving device 111 or the CD-ROM driving device 113 or received by the communication interface 109 and stored in the fixed disk 107. Then, the software is read from the fixed disk 107 to the memory 106 and executed by the CPU 105.

<Functional configuration>
Next, each function of the computer 100 according to the present embodiment will be described. FIG. 3 is a block diagram showing a functional configuration of the harmonic analysis apparatus (computer 100) according to the present embodiment. Referring to FIG. 3, computer 100 according to the present embodiment includes first extraction unit 105A, second extraction unit 105B, analysis unit 105C, first repetition unit 105E, and second repetition. Part 105F and output part 105G. Analysis unit 105C includes a constant calculation unit 105D. As described above, the computer 100 includes the memory 106 (or the fixed disk 107) and the monitor 102.

  The first extraction unit 105A, the second extraction unit 105B, the analysis unit 105C, the constant calculation unit 105D, the first repetition unit 105E, the second repetition unit 105F, and the output unit 105G are the CPU 105 It is a functional block realized by the above. More specifically, each function of the CPU 105 is realized by the CPU 105 executing a control program stored in the memory 106, the fixed disk 107, or the like to control each hardware shown in FIGS. It is a function.

  In the present embodiment, the function for executing the harmonic analysis processing is realized by software executed on the CPU 105, but instead of realizing the function of each block and the processing of each step by software. In addition, each may be realized by a dedicated hardware circuit or the like.

  The CPU 105 temporarily transfers the data 1061 (1061A, 1061B), 1062, 1063, 1064 (1064A, 1064B, 1064C), 1065 stored in the nonvolatile fixed disk 107 to the memory 106 that functions as a work memory. After reading, the data 1061 (1061A, 1061B), 1062, 1063, 1064 (1064A, 1064B, 1064C), 1065 stored in the memory 106 is used to execute analysis processing.

  The memory 106 stores data 1061 indicating a model of a power system that is a target of harmonic analysis. More specifically, the memory 106 stores power system data 1061A for storing connection states between circuit elements in the power system, and circuit element data 1061B for storing attribute values of the respective circuit elements. FIG. 4 is an image diagram showing an example of a power system model represented by power system data 1061A and circuit element data 1061B.

  Referring to FIG. 4, power system data 1061A represents, for example, a connection relationship between a plurality of generators G1 and G2 and other circuit elements (such as power transmission lines and filters) included in the power system. The circuit element data 1061B stores, for example, attribute values of circuit elements such as electric resistance R, inductance L, and capacitor C in association with each circuit element. The CPU 105 can calculate the impedance corresponding to the harmonic order between the nodes 11, 12, 13 and the filter 10 based on the power system data 1061A and the circuit element data 1061B.

  The CPU 105 receives input of information related to the connection state between circuit elements in the power system from the user, and stores the power system data 1061A in the memory 106 or updates the power system data 1061A. Further, the CPU 105 receives an input of an attribute value of the circuit element from the user, and stores the circuit element data 1061B in the memory 106 or updates the power system data 1061A.

  The memory 106 stores parallel pattern data 1062 indicating a parallel pattern of generators included in the power system. FIG. 5 is an image diagram showing an example of the data structure of the juxtaposed pattern data 1062.

  Referring to FIG. 5, juxtaposed pattern data 1062 stores, for each juxtaposed pattern, a flag indicating whether each of the generators included in the target power system is in a juxtaposed state or a disconnected state. To do. Specifically, the juxtaposition pattern 1 shows a state in which all the generators are juxtaposed. That is, the juxtaposition pattern 1 indicates that all the generators can generate power. The parallel insertion pattern 2 shows a state in which the generators 1 to 6 are disconnected and the generators 7 to 19 are inserted in parallel. In other words, the insertion pattern 2 indicates that the generators 1 to 6 are in a dormant state and the generators 7 to 19 are in a state capable of generating power. The insertion pattern 3 shows a state in which the generators 1, 2, 4, 5, and 6 are disconnected and other generators are inserted in parallel.

  The CPU 105 receives input of information related to the generator parallel insertion pattern included in the electric power system from the user, and stores the parallel insertion pattern data 1062 in the memory 106 or updates the parallel insertion pattern data 1062.

  The memory 106 stores attribute value data 1063 for storing a parallel attribute value (first attribute value) in the parallel state and a disengagement attribute value (second attribute value) in the disengagement state for each of the generators. Remember. FIG. 6 is an image diagram showing an example of the data structure of the attribute value data 1063.

  Referring to FIG. 6, attribute value data 1063 includes, for each generator included in the power system, a parallel attribute value such as a generator terminal voltage and a generator effective voltage in the parallel state, and a parallel state in the disconnected state. Stores the separation attribute values such as the generator terminal voltage and the generator effective voltage. In FIG. 6, the insertion attribute value and the separation attribute value are shown using the unit method (PU method).

  The CPU 105 accepts input of information related to the parallel attribute value in the parallel state and the parallel attribute value in the parallel state for each of the generators from the user, and stores the attribute value data 1063 in the memory 106, The attribute value data 1063 is updated.

  The memory 106 stores an analysis program 1065 for analyzing harmonics. As a result, the CPU 105 reads out the analysis program 1065 from the fixed disk 107 to the memory 106, and analyzes the harmonics by executing the analysis program 1065 for each parallel pattern and each harmonic. More specifically, the CPU 105 uses the analysis program 1065, and based on the power system data 1061A, the circuit element data 1061B, the attribute value of each generator, etc., harmonic voltage distortion and harmonic current in the target power system. Analyze distortion.

  With reference to FIG. 3, each function of the CPU 105 will be described. 105 A of 1st extraction parts receive the command to the effect of performing a harmonic analysis process from a user or another application, and the parallel insertion sequence of each of the generators included in an electric power system from the parallel insertion pattern data 1062 The state is sequentially extracted for each juxtaposed pattern. That is, when the first extraction unit 105A performs harmonic analysis processing for one juxtaposed pattern, each generator is in a juxtaposed state or in a disconnected state with reference to the juxtaposed pattern data 1062. Reads information indicating whether there is. And the 1st extraction part 105A delivers the information which shows whether each generator is a parallel insertion state or a disconnection state to the 2nd extraction part 105B.

  Based on the information from the first extraction unit 105A, the second extraction unit 105B determines from the attribute value data 1063 the parallel attribute value of the generator in the parallel state and the solution of the generator in the parallel state. Extract column attribute values. That is, the second extraction unit 105B determines from the attribute value data 1063 the parallel attribute values of the generators in the parallel state and the parallels based on the parallel parallel state of the generators corresponding to the parallel pattern. The disconnection attribute value of the generator in the state is read and transferred to the analysis unit 105C.

  The analysis unit 105C receives the parallel attribute value of the generator in the parallel state and the parallel attribute value of the generator in the parallel state from the second extraction unit 105B, and executes the analysis program 1065 The harmonics are analyzed for each of the incoming patterns and for each harmonic order. The analysis unit 105 </ b> C sequentially stores the analysis results in the analysis result data 1064 of the memory 106.

  Here, the constant calculation unit 105D of the analysis unit 105C refers to the circuit element data 1061B, and calculates (acquires) the impedance in each node and each filter, for example, for each harmonic order based on the attribute value for each circuit element. To do. In this way, the analysis unit 105C calculates the harmonic voltage and the harmonic current at the node and filter designated by the user using the impedance for each harmonic order calculated by the constant calculation unit 105D ( To analyze.

  When the second repetitive unit 105F finishes analyzing the harmonics of the harmonic order of 1 in one type of juxtaposed pattern, the second repetitive unit 105F informs the analyzing unit 105C about the orders of other harmonics in the juxtaposed pattern. Perform harmonic analysis. For example, the second repetition unit 105F causes the analysis unit 105C to repeatedly perform harmonic analysis from the first order to the sixth order in one juxtaposed pattern. The constant calculation unit 105D of the analysis unit 105C calculates an impedance or the like according to the order of the target harmonic based on the circuit element data 1061B.

  When the first repeating unit 105E finishes analyzing the harmonics of all orders for one juxtaposed pattern, the first repetitive unit 105E causes the first extracting unit 105A to transmit another juxtaposed pattern (next juxtaposed pattern). Then, the parallel-release state of each generator included in the power system is extracted from the parallel-pattern data 1062. That is, the first extraction unit 105A refers to the parallel pattern data 1062 and reads information indicating whether each generator is in a parallel state or a disconnected state with respect to other parallel patterns.

  As a result, the second extraction unit 105B determines from the attribute value data 1063 the parallel attribute value of the generator that is in the juxtaposed state in the other juxtaposed pattern and the power generation in the disconnected state in the other juxtaposed pattern Extract the machine release attribute value. The analysis unit 105C executes the analysis program 1065 to analyze the harmonics for each harmonic order with respect to other parallel patterns. That is, the second repetition unit 105F causes the analysis unit 105C to repeatedly perform harmonic analysis for each harmonic order for the juxtaposed pattern.

  Since computer 100 according to the present embodiment has such a configuration, it is possible to efficiently analyze harmonics for each of the parallel patterns of a plurality of generators.

  The computer 100 according to the present embodiment analyzes harmonics for each incoming pattern and for each harmonic order, and sequentially stores the analysis results in the analysis result data 1064. FIG. 7 is an image diagram illustrating an example of information represented by the analysis result data 1064.

  Referring to FIG. 7, analysis result data 1064 stores an analysis result for each insertion pattern calculated by CPU 105 for the 1st order of the harmonic. For example, the analysis result data 1064 stores the generator parallel input state and harmonic current (harmonic voltage) in association with each parallel pattern. Examples of the juxtaposed state include a parallel capacity [MVA] of generators and the number of generators.

  Referring to FIGS. 3 and 7, the output unit 105G outputs the analysis result for each insertion pattern to the monitor 102 or the like by referring to the analysis result data 1064 according to an output command from the outside.

  Since the computer 100 according to the present embodiment has such a configuration, the user can easily grasp a suitable insertion pattern (operable range) by referring to the output analysis result. . For example, when it is preferable that the harmonic voltage or the harmonic current is equal to or less than a first predetermined value (limit value), when the analysis result shown in FIG. 7 is obtained, the user can select a suitable number of parallel generators. Can easily be recognized as 7 or more.

  Here, the output unit 105 </ b> G is a boundary indicating a boundary between a suitable generator juxtaposition pattern and an inappropriate generator juxtaposition pattern so that the user can more easily recognize the suitable generator juxtaposition pattern. The line may be displayed on the monitor 102 together with the analysis result. Further, the output unit 105G may display character information and image information indicating a suitable generator insertion pattern on the monitor 102 together with the analysis result. For example, when it is preferable that the harmonic voltage or the harmonic voltage is equal to or lower than the limit value, when the analysis result shown in FIG. 7 is obtained, the output unit 105G indicates to the monitor 102 that “the number of suitable parallel generators is 7 It may be displayed that "there is more than a unit."

  FIG. 8A is an image diagram showing information represented by analysis result data 1064A of the nth harmonic. As shown in FIGS. 3 and 8A, the analysis unit 105C stores the analysis result of the nth harmonic in the analysis result data 1064A for each insertion pattern. More specifically, when the analysis of the nth harmonic is completed for each parallel pattern, the analysis unit 105C determines the number of parallel generators corresponding to the parallel pattern and the harmonic current (harmonic voltage). Are associated with each other and stored in the analysis result data 1064A.

  Then, the output unit 105G refers to the analysis result data 1064A according to an output command from the outside, and outputs the analysis result of the nth harmonic for each insertion pattern to the monitor 102 or the like.

  As in the case shown in FIG. 7, the output unit 105 </ b> G allows the user to easily recognize a suitable generator parallel insertion pattern (operable range) and a suitable generator parallel insertion pattern and inappropriate power generation. A boundary line indicating the boundary with the machine insertion pattern may be displayed on the monitor 102 together with the analysis result. Further, the output unit 105G may display character information and image information indicating a suitable generator insertion pattern on the monitor 102 together with the analysis result. For example, in the case where the harmonic current is preferably 300 A or less, when the analysis result shown in FIG. 8A is obtained, the output unit 105G indicates to the monitor 102 that “the number of suitable parallel generators is five or more. May be displayed.

  FIG. 8B is an image diagram showing information represented by analysis result data 1064B of the (n + 1) th-order harmonic. As shown in FIGS. 3 and 8B, the analysis unit 105C stores the analysis result of the (n + 1) th-order harmonic in the analysis result data 1064B for each insertion pattern. More specifically, when the analysis of the (n + 1) th-order harmonic is completed for each parallel pattern, the analysis unit 105C determines the number of parallel generators corresponding to the parallel pattern and the harmonic current (harmonic voltage). Are associated with each other and stored in the analysis result data 1064B.

  And the output part 105G outputs the analysis result of the n + 1st-order harmonic for every insertion pattern to the monitor 102 etc. with reference to the analysis result data 1064B according to the output command from the outside.

  As in the case shown in FIG. 7, the output unit 105 </ b> G allows the user to easily recognize a suitable generator parallel insertion pattern (operable range) and a suitable generator parallel insertion pattern and inappropriate power generation. A boundary line indicating the boundary with the machine insertion pattern may be displayed on the monitor 102 together with the analysis result. Further, the output unit 105G may display character information and image information indicating a suitable generator insertion pattern on the monitor 102 together with the analysis result. For example, in the case where the harmonic current is preferably 300 A or less, when the analysis result shown in FIG. 8B is obtained, the output unit 105G indicates to the monitor 102 that “the number of suitable parallel generators is four or less. And 21 or more ”may be displayed.

  FIG. 8C is an image diagram showing information represented by analysis result data 1064C of the (n + 2) th harmonic. As shown in FIGS. 3 and 8C, the analysis unit 105C stores the analysis result of the (n + 2) th harmonic in the analysis result data 1064C for each parallel pattern. More specifically, when the analysis of the (n + 2) th order harmonic is completed for each parallel pattern, the analysis unit 105C determines the number of parallel generators corresponding to the parallel pattern and the harmonic current (harmonic voltage). Are associated with each other and stored in the analysis result data 1064C.

  Then, the output unit 105G refers to the analysis result data 1064C in accordance with an output command from the outside, and outputs the analysis result of the n + second harmonic for each insertion pattern to the monitor 102 or the like.

  As in the case shown in FIG. 7, the output unit 105 </ b> G allows the user to easily recognize a suitable generator parallel insertion pattern (operable range) and a suitable generator parallel insertion pattern and inappropriate power generation. A boundary line indicating the boundary with the machine insertion pattern may be displayed on the monitor 102 together with the analysis result. Further, the output unit 105G may display character information and image information indicating a suitable generator insertion pattern on the monitor 102 together with the analysis result. For example, when it is preferable that the harmonic current is 300 A or less, when the analysis result shown in FIG. 8C is obtained, the output unit 105G indicates to the monitor 102 that “the number of suitable parallel generators is 21 or less. May be displayed.

  As described above, the computer 100 according to the present embodiment allows each of the parallel patterns of the plurality of generators or the harmonics without inputting the attribute value regarding the power system for each parallel pattern or for each harmonic order. Harmonics can be efficiently analyzed for each order. That is, the computer 100 according to the present embodiment can shorten the harmonic analysis time in the power system including a plurality of generators and circuit elements.

<Processing Procedure of Computer 100>
Next, an overall processing procedure of the computer 100 according to the present embodiment will be described. FIG. 9 is a flowchart showing an overall processing procedure of the computer 100 according to the present embodiment.

  Referring to FIG. 9, first, the user inputs data related to the target power system to computer 100 (step S102). That is, the CPU 105 accepts connection information between circuit elements necessary for generating a power system model.

  The user inputs a generator insertion pattern for which harmonic analysis is desired to the computer 100 (step S104). That is, the CPU 105 receives information related to the generator entry pattern. Specifically, the CPU 105 accepts a selection command for a parallel state or a disconnected state for each generator.

  The user selects data extracted as an analysis result (step S106). That is, the CPU 105 receives from the user an instruction for selecting a node or filter to be analyzed for harmonics.

  The user inputs an attribute value for each generator into the computer 100 (step S108). That is, the CPU 105 accepts a parallel attribute value and a disconnect attribute value for each generator.

  Next, the CPU 105 determines whether or not an analysis process start command has been received from the user (step S110). That is, the CPU 105 waits for an analysis processing start command.

  When CPU 105 receives an analysis process start command (YES in step S110), CPU 105 executes the analysis process (step S200). The analysis process (step S200) will be described later.

  When the analysis process (step S200) ends, the CPU 105 outputs an analysis result (step S110).

<Processing Procedure of Analysis Processing in Computer 100>
Next, a processing procedure of harmonic analysis processing in computer 100 according to the present embodiment will be described. FIG. 10 is a flowchart showing a processing procedure of harmonic analysis processing in computer 100 according to the present embodiment. Here, the computer 100 relates to an electric power system including 19 generators, and the harmonics from the second order to the sixth order (N = 6) with respect to nine (M = 9) juxtaposition patterns (see FIG. 5). The case of analyzing is described.

  With reference to FIG. 10, first, the CPU 105 initializes a target insertion pattern number m (step S202). Next, the CPU 105 extracts the juxtaposed state of the m-th juxtaposed pattern. That is, the CPU 105 reads from the parallel pattern data 1062 the parallel / disconnected state for each generator in the m-th parallel pattern (step S204).

  Next, the CPU 105 initializes the order n of the target harmonic (step S206). The CPU 105 selectively extracts the entry attribute value or the separation attribute value for each generator from the attribute value data 1063 based on the entry / disconnection state for each generator (step S208).

  The CPU 105 analyzes the nth harmonic using the analysis program (step S210), and stores the analysis result in the analysis result data 1064 (step S212). The CPU 105 increments the target harmonic order n (step S214).

  The CPU 105 determines whether or not the order n of the current harmonic is larger than 6 (n> 6) (step S216). CPU105 repeats the process from step S208, when the order n of the harmonic currently made into object is 6 or less (when it is n <= 6) (when it is NO in step S216).

  On the other hand, when the harmonic order n of the current target is larger than 6 (n> 6) (YES in step S216), CPU 105 increments insertion pattern number m (step S218). ). The CPU 105 determines whether or not the current insertion pattern number m is greater than 9 (m> 9) (step S220).

  CPU105 repeats the process from step S204, when the insertion pattern number m currently made into is 9 or less (m <= 9) (when it is NO in step S220). On the other hand, CPU105 complete | finishes an analysis process (step S200), when the insertion pattern number m currently made into object is larger than 9 (m> 9) (when it is YES in step S220).

<Other embodiments>
The program according to the present invention may be a program module that is provided as a part of a computer operating system (OS) and that calls necessary modules in a predetermined arrangement at a predetermined timing to execute processing. . In that case, the program itself does not include the module, and the process is executed in cooperation with the OS. A program that does not include such a module can also be included in the program according to the present invention.

  The program according to the present invention may be provided by being incorporated in a part of another program. Even in this case, the program itself does not include the module included in the other program, and the process is executed in cooperation with the other program. Such a program incorporated in another program can also be included in the program according to the present invention.

  The provided program product is installed in a program storage unit such as a hard disk and executed. Note that the program product includes the program itself and a storage medium in which the program is stored.

  Furthermore, part or all of the functions (for example, the functional blocks shown in FIGS. 5 and 20) realized by the program according to the present invention may be configured by dedicated hardware.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a perspective view which shows the computer which is an example of the harmonic analyzer which concerns on this Embodiment. It is a control block diagram which shows the hardware constitutions of the computer which is an example of the harmonic analyzer which concerns on this Embodiment. It is a block diagram which shows the function structure of the harmonic analyzer (computer) which concerns on this Embodiment. It is an image figure which shows an example of the model of the electric power system represented by electric power system data and circuit element data. It is an image figure which shows an example of the data structure of insertion pattern data. It is an image figure which shows an example of the data structure of attribute value data. It is an image figure which shows an example of the information which analysis result data represent. An example of information represented by analysis result data of the nth harmonic, an example of information represented by analysis result data of the (n + 1) th harmonic, and an example of information represented by analysis result data of the (n + 2) th harmonic are shown. It is an image figure. It is a flowchart which shows the whole process sequence of the computer which concerns on this Embodiment. It is a flowchart which shows the process sequence of the analysis process of the harmonic in the computer which concerns on this Embodiment.

Explanation of symbols

  10 Filter, 11, 12, 13 node, 100 computer, 101 computer main body, 102 monitor, 103 keyboard, 104 mouse, 105A first extraction unit, 105B second extraction unit, 105C analysis unit, 105D constant calculation unit, 105E First repetition unit, 105F Second repetition unit, 105G output unit, 106 memory, 107 fixed disk, 108 internal bus, 109 communication interface, 1061 data, 1061A power system data, 1061B circuit element data, 1062 parallel pattern data , 1063 attribute value data, 1064, 1064A, 1064B, 1064C analysis result data, 1065 analysis program.

Claims (6)

A harmonic analysis device that analyzes harmonics in the power system using an analysis program for analyzing harmonics,
Second data for storing first data indicating a mutual connection relationship in a power system including a plurality of generators and circuit elements, and a parallel arrangement state of each of the plurality of power generators in association with a parallel pattern. A storage unit for storing data and third data for storing the first attribute value in the juxtaposed state and the second attribute value in the disconnected state in association with each of the plurality of generators;
First extraction means for sequentially extracting the juxtaposed state of each of the plurality of generators corresponding to the juxtaposition pattern from the second data;
The first attribute value corresponding to the power generator in the juxtaposed state and the power generator in the shunt state from the third data based on the juxtaposed parallel state of each of the plurality of generators extracted. Second extracting means for extracting the second attribute value corresponding to
Analyzing means for analyzing harmonics based on the first attribute value and the second attribute value extracted by using the analysis program based on the first data;
A harmonic analysis apparatus comprising: a first repetition unit that repeatedly functions the first extraction unit, the second extraction unit, and the analysis unit for each of the juxtaposed patterns. The analysis means uses the analysis program based on the first data, so that a constant related to the power system necessary for harmonic analysis is determined according to the order for the parallel pattern and the harmonic order. Calculating and analyzing harmonics based on the extracted first and second attribute values;
The harmonic analysis apparatus according to claim 1, further comprising second repetition means for causing the analysis means to repeatedly function for each order of the harmonics. The storage unit stores fourth data for storing harmonic analysis results for each of the juxtaposed patterns and for each order of the harmonics,
The analysis means stores harmonic analysis results in the fourth data,
3. The harmonic analysis apparatus according to claim 1, further comprising an output unit configured to simultaneously output an analysis result for each of the juxtaposition patterns with respect to each of the orders with reference to the fourth data. A control program for harmonic analysis for causing a computer to analyze harmonics in the power system by using an analysis program for analyzing harmonics,
The computer stores first data indicating a mutual connection relationship in a power system including a plurality of generators and circuit elements, and a parallel arrangement state of each of the plurality of generators in association with a parallel pattern. Storage for storing second data to be stored and third data for storing the first attribute value in the juxtaposed state and the second attribute value in the disconnected state in association with each of the plurality of generators Part
The control program for analysis is stored in the computer.
Extracting the juxtaposed state of each of the plurality of generators corresponding to the juxtaposition pattern from the second data;
The first attribute value corresponding to the power generator in the juxtaposed state and the power generator in the shunt state from the third data, based on the parallel juxtaposed state of each of the plurality of generators extracted. Extracting the second attribute value corresponding to
Analyzing the harmonics based on the extracted first attribute value and the second attribute value by using the analysis program based on the first data;
A harmonic analysis control program that repeatedly executes the step of extracting the juxtaposed sequence, the step of extracting the attribute value, and the step of analyzing for each of the juxtaposed patterns. The analyzing step uses the analysis program based on the first data to determine constants relating to the power system necessary for harmonic analysis for the parallel pattern and the harmonic order according to the order. And analyzing harmonics based on the extracted first attribute value and the second attribute value,
The harmonic analysis control program is stored in the computer.
The harmonic analysis control program according to claim 4, wherein the analyzing step is repeatedly executed for each harmonic order. The storage unit stores fourth data for storing harmonic analysis results for each of the juxtaposed patterns and for each order of the harmonics,
The step of analyzing includes storing harmonic analysis results in the fourth data,
The harmonic analysis control program is stored in the computer.
The harmonic analysis control program according to claim 4 or 5, further comprising the step of simultaneously outputting an analysis result for each of the juxtaposition patterns with respect to each of the orders with reference to the fourth data.

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