JP2006042407A - Information processing device, output voltage calculation method, and program for calculation of output voltage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processing device which can decide the output voltage capable of fairly taking partial charge of load, regardless of the length or the thickness of wiring, when operating uninterruptible power units in parallel. <P>SOLUTION: This information processor, which executes the processing of calculating the output voltage of each uninterruptible power unit at the time of operating a plurality of uninterruptible power units in parallel, has an input means (an input device 10i), which receives the input of the information about the length of a interconnect line from each uninterruptible power unit to a connection point and the thickness of the interconnection line, a calculation means (CPU10a) which calculates the impedance that each interconnect line has, referring to the information inputted from the input means; a deciding means (CPU10a) which decides the output voltage of each uninterruptible power unit, referring to the impedance calculated by the calculation means; and an indication means (a video circuit 10e and a display 10h), which indicates the output voltage of each uninterruptive power unit decided by the decision means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an information processing apparatus, an output voltage calculation method, and an output voltage calculation program.

  In a conventional uninterruptible power supply, the so-called constant inverter type uninterruptible power supply converts the DC power obtained by converting AC power from the commercial power source into DC power even when the commercial power source is normal. When output to the load and the commercial power supply fails, the DC power from the storage battery is converted to AC power and output to the load. And this uninterruptible power supply device outputs the inverter circuit for power conversion, and the AC power synchronized with the commercial power by adjusting the output power from the inverter circuit by PWM control of the semiconductor switching element constituting the inverter circuit And an inverter circuit control device including PWM control signal generation means for generating a PWM control signal for the purpose.

  When a large power capacity is required, a plurality of uninterruptible power supply devices of this type are connected in parallel and operated. In addition to uninterruptible power supplies, driving inverters such as motors are also operated in parallel. When a plurality of inverters are operated in parallel, if the load sharing ratio of one inverter becomes extremely large, a large burden may be imposed on the inverter. There is also a problem that parallel operation is not possible due to the safety circuit.

  When a plurality of uninterruptible power supply devices are operated in parallel, a cross current of reactive current is generated if there is a difference in amplitude between the output voltages of the power supply devices. If there is a phase difference in the output voltage, a cross current of effective current is generated. Therefore, conventionally, the reactive current and effective current are extracted from the output current of each uninterruptible power supply, the amplitude of the output voltage is changed according to the change in the reactive current, and the output voltage according to the change in the effective current. By changing the phase of each of the uninterruptible power supply units, the power is fairly shared.

  In Patent Document 1, the output of a differential amplifier circuit that amplifies the difference between an output voltage and a sine wave reference signal is output to a plurality of inverters controlled via a PWM drive circuit, and a plurality of inverters are connected. A method of parallel operation is shown. In this method, means for adding or subtracting the detection signal of the output current of the inverter to the input or output of the differential amplifier circuit is provided. When the output voltage of the inverter is lowered, the output current detection signal is added to the sine wave signal from the sine wave generation circuit and then applied to the differential amplifier circuit together with the output voltage detection signal to raise the inverter output voltage. In this case, a signal obtained by adding the current detection signal and the voltage detection signal and a signal from the sine wave generation circuit are supplied to the error amplification circuit. This controls the cross current between the inverters. If this method is used, the cross current can be controlled by itself without referring to the output of another inverter.

Japanese Patent Laid-Open No. 2-101932 (Claims, Abstract)

  By the way, in the technique disclosed by patent document 1, since each uninterruptible power supply operate | moves separately, in order to share a load fairly, from each uninterruptible power supply to a load (or connection point) Must be set to have the same wiring length.

  However, when installing the uninterruptible power supply, it is difficult to make the wiring lengths of all the uninterruptible power supply equal because of the installation space. For this reason, when installing, it is necessary to connect a dummy load and individually set the control parameters of each uninterruptible power supply using a measuring instrument or the like, which is troublesome.

  Further, when such setting work is not performed, load sharing may not be performed properly, and the load of a specific uninterruptible power supply may be relatively heavy. In addition, when the load sharing is biased to a predetermined amount or more, there is a problem that a warning may be issued or the operation may be stopped.

  The present invention has been made based on the above circumstances, and the purpose of the present invention is to share the load fairly regardless of the length and thickness of the wiring when the uninterruptible power supply devices are operated in parallel. An object of the present invention is to provide an information processing apparatus, an output voltage calculation method, and an output voltage calculation program capable of determining a possible output voltage.

  In order to achieve the above-described object, the present invention provides an information processing apparatus that executes a process of calculating an output voltage of each uninterruptible power supply when a plurality of uninterruptible power supplies are operated in parallel. An input unit that receives input of information on the length of the connection line to the connection point and the thickness of the connection line, a calculation unit that calculates the impedance of each connection line with reference to the information input from the input unit; Referring to the impedance calculated by the calculating means, determining means for determining the output voltage of each uninterruptible power supply, and presenting means for presenting the output voltage of each uninterruptible power supply determined by the determining means .

  For this reason, when an uninterruptible power supply unit is operated in parallel, an information processing apparatus capable of determining an output voltage capable of performing load sharing fairly regardless of the length and thickness of the wiring is provided. Can do.

  In addition to the above-described invention, the information processing apparatus according to another aspect of the invention may be configured such that the calculation unit calculates the impedance from the length and thickness of the connection line and adds a correction value obtained from the actual measurement value. Is calculated. For this reason, since it becomes possible to calculate | require the impedance of a connecting line correctly, an output voltage can be calculated | required more correctly.

  In addition to the above-described invention, in the information processing apparatus according to another invention, the calculation means calculates the impedance in consideration of the contact resistance of the connection line. For this reason, since it becomes possible to obtain | require the impedance of a connection line more correctly, an output voltage can be calculated | required more correctly.

  In addition to the above-described invention, in the information processing apparatus of another invention, the determining means determines the output voltage while ignoring the cross current flowing between the uninterruptible power supply devices. For this reason, it becomes possible to simplify calculation.

  In addition to the above-described invention, in the information processing apparatus of another invention, when the determining means connects a load that is approximately 50% of the maximum rated load, the output currents of all the uninterruptible power supply apparatuses are substantially equal. In this way, the output voltage is determined. For this reason, even when the load fluctuates, variation in output current of each uninterruptible power supply can be reduced.

  Further, in addition to the above-described invention, the information processing apparatus according to another aspect of the invention may be configured such that, when the load is constant during operation, when the load is connected, the output current of all uninterruptible power supplies The output voltage is determined so that the two are substantially equal. For this reason, the optimal setting according to load can be performed.

  Further, the present invention relates to an output voltage calculation method for calculating an output voltage of each uninterruptible power supply when a plurality of uninterruptible power supplies are operated in parallel, and a length of a connection line from each uninterruptible power supply to a connection point. Receives input of information regarding connection line thickness, calculates the impedance of each connection line with reference to the input information, and determines the output voltage of each uninterruptible power supply with reference to the calculated impedance Then, the determined output voltage of each uninterruptible power supply is presented.

  For this reason, when the uninterruptible power supply devices are operated in parallel, an output voltage calculation method capable of determining an output voltage that can perform load sharing fairly regardless of the length and thickness of the wiring is provided. be able to.

  Further, the present invention provides a computer-readable output voltage calculation program for causing a computer to function to calculate the output voltage of each uninterruptible power supply when operating a plurality of uninterruptible power supplies in parallel. Referring to the input means for receiving information about the length of the connection line from the uninterruptible power supply to the connection point and the thickness of the connection line, and the information input from the input means, the impedance of each connection line is calculated. The calculation means and the impedance calculated by the calculation means are referred to function as a determination means for determining the output voltage of each uninterruptible power supply.

  For this reason, when operating uninterruptible power supplies in parallel, we provide an output voltage calculation program that can determine the output voltage that can be used to share the load fairly regardless of the length and thickness of the wiring. can do.

  The present invention relates to an information processing apparatus capable of determining an output voltage capable of fairly sharing a load regardless of the length and thickness of the wiring when the uninterruptible power supply devices are operated in parallel, and the output voltage. A calculation method and an output voltage calculation program can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration example of an information processing apparatus according to an embodiment of the present invention. As shown in this figure, an information processing apparatus 10 according to an embodiment of the present invention is configured by a personal computer, for example, and includes a central processing unit (CPU) 10a, a read only memory (ROM) 10b, a random access memory (RAM). ) 10c, HDD (Hard Disk Drive) 10d, video circuit 10e, I / F (Interface) 10f, bus 10g, display device 10h, and input device 10i.

  Here, the CPU 10a as the calculation unit and the determination unit is a central processing unit that executes various arithmetic processes and controls each unit of the apparatus according to a program stored in the HDD 10d.

  The ROM 10b is a semiconductor storage device that stores a program executed by the CPU 10a. The RAM 10c is a semiconductor storage device that temporarily stores a program executed by the CPU 10a.

  The HDD 10d stores programs and data executed by the CPU 10a. Specifically, the HDD 10d has a simulation program 10d1 and simulation data 10d2. Here, as will be described later, the simulation program 10d1 calculates the output voltage of each uninterruptible power supply with reference to the length and thickness of the connection line when a plurality of uninterruptible power supplies are operated in parallel. It is a program. As the simulation data 10d2, data for obtaining the impedance from the length and thickness of the connection line are stored.

  The video circuit 10e as the presenting means executes a drawing process according to the drawing command supplied from the CPU 10a, converts an image obtained as a result of the drawing process into a video signal, and outputs the video signal to the display device 10h.

  The I / F 10f executes a process of converting the expression format of the signal output from the input device 10i and inputting it. The bus 10g is a signal line group for connecting the CPU 10a, the ROM 10b, the RAM 10c, the HDD 10d, the video circuit 10e, and the I / F 10f to each other so that information can be exchanged between them.

  The display device 10h is a device for displaying a video signal output from the video circuit 10e, and includes a CRT (Cathode Ray Tube) monitor or the like. The input device 10i as input means is configured by, for example, a keyboard or a mouse.

  Next, an uninterruptible power supply apparatus that is an object of simulation by the information processing apparatus according to the present embodiment will be described.

  FIG. 2 is an example of an uninterruptible power supply system targeted for simulation by the information processing apparatus according to the present embodiment. In this example, the uninterruptible power supply system includes uninterruptible power supply devices 50 to 70, and connection lines 81 to 83 each having a length from the uninterruptible power supply devices 50 to 70 to the connection point D are X1 to X3, respectively. And connected to the load 90 via a connection line 84. The uninterruptible power supply devices 50 to 70 perform parallel operation and drive the load 90 by three units.

  3 is a block diagram showing a detailed configuration example of the uninterruptible power supply 50 shown in FIG. Since the uninterruptible power supply 60 and 70 have the same configuration as the uninterruptible power supply 50, the following description will be made by taking the uninterruptible power supply 50 as an example. The explanation is omitted.

  As shown in FIG. 3, the uninterruptible power supply 50 includes a converter 50a, a storage battery 50b, an inverter 50c, a PWM (Pulse Width Modulation) drive circuit 50d, an error amplification circuit 50e, a reference sine wave generation circuit 50f, and a reference clock generation circuit 50g. A control circuit 50h, a current transformer 50i, a transformer 50j, and switches 50k and 50m.

  Here, the converter 50a is a conversion device that converts commercial power into DC power. The storage battery 50b is composed of, for example, a lead storage battery, and is charged by DC power output from the converter 50a during normal operation, and supplies power to the inverter 50c during a power failure.

  The inverter 50c is a conversion device that converts the DC power output from the converter 50a or the DC power output from the storage battery into AC power and outputs the AC power. The PWM drive circuit 50d compares the sine wave output from the error amplifier circuit 50e with the internally generated triangular wave, and drives the inverter 50c according to the comparison result.

  The error amplifier circuit 50e compares the reference sine wave output from the reference sine wave generation circuit 50f with the output voltage Vo, detects a deviation (error) of the output voltage Vo from the reference sine wave, and outputs the detected deviation. The reference sine wave generation circuit 50f generates and outputs a reference sine wave having an amplitude and frequency according to the control of the control circuit 50h based on the reference clock output from the reference clock generation circuit 50g.

  The reference clock generation circuit 50g generates a reference clock signal for generating a reference sine wave and supplies it to the reference sine wave generation circuit 50f. The control circuit 50h refers to the output of the current transformer 50i indicating the output current Io and the output voltage Vo to control the reference sine wave generation circuit 50f to adjust the amplitude of the sine wave and to control the reference clock generation circuit 50g. Adjust the frequency of the sine wave.

  The current transformer 50i converts the output current Io (current flowing into the primary winding of the transformer 50j) into a corresponding voltage and outputs it. The transformer 50j converts the voltage applied to the primary winding into a voltage corresponding to the turn ratio and outputs it to the secondary winding.

  The switch 50k is a bypass switch and is turned on when the electric power from the commercial power supply is output as it is, and is turned off in other cases. The switch 50m is turned on when the electric power from the inverter 50c is output, and is otherwise turned off.

  FIG. 4 is an equivalent circuit of the uninterruptible power supply system shown in FIG. As shown in this example, uninterruptible power supplies 50 to 70 are represented by voltage sources whose output voltages are V1 to V3, respectively, and load 90 is represented as an element having an impedance of ZL. Connection lines connecting uninterruptible power supply 50-70 and load 90 are represented as elements of impedances Z1-Z3 calculated from their lengths and thicknesses. That is, when the thickness of the connection line is r, the resistance value per unit length of the connection line with respect to the thickness is Rr, the inductance value per unit length is Lr, and the length of each connection line is X1. ˜X3, Z1 to Z3 are theoretically obtained by the following formula.

  The above are theoretical values, but according to actual measurements, Z1 to Z3 are deviated from the theoretical values. In addition, since contact resistance exists between the uninterruptible power supply devices 50 to 70 and the connection line, an actual equivalent circuit is as shown in FIG. Here, Z1 'to Z3' are corrected impedance values obtained by adding correction values based on actual measurement values to theoretical values, and are represented by the following equations. R1 to R3 are contact resistances, and are values determined by, for example, the type of uninterruptible power supply.

  Here, ΔZ (X1) to ΔZ (X3) are respective correction values of the connection lines 81 to 83, and are values determined by the thickness r and the lengths X1 to X3. These values can be obtained from an approximate expression derived from a value obtained by actual measurement and obtained from the approximate expression, or a database can be generated from the value obtained by actual measurement and obtained from the database.

  Incidentally, in the equivalent circuit as shown in FIG. 5, when the impedance ZL of the load 90 is changed when the length of each connection line is not constant, the output currents I1 to I3 flowing out from the uninterruptible power supply devices 50 to 70. Varies depending on the load, but the behavior is not the same because Z1 ′ to Z3 ′ and R1 to R3 are not the same.

  In such a case, since the output currents I1 to I3 of the uninterruptible power supply devices 50 to 70 do not coincide with each other, the load sharing is not fair. It may be emitted or the device may be stopped.

  Therefore, in the information processing apparatus 10 according to the present embodiment, when the impedance value ZL of the load 90 is 50%, each uninterruptible power supply apparatus is configured such that the output currents of all the uninterruptible power supply apparatuses 50 to 70 match. A simulation (approximate calculation) for setting 50 to 70 output voltages V1 to V3 is performed. After describing the outline below, specific processing will be described.

  In this embodiment, when the maximum load that can be connected to the uninterruptible power supply devices 50 to 70 in parallel operation is ZLmax, each uninterruptible power supply is obtained when this 50% load, 2 · ZLmax, is connected. It is assumed that a current of Imax / 2 that is 50% of the maximum rated current Imax flows from the power supply devices 50 to 70, and that the cross current is negligible. In such a condition, the output voltage of each uninterruptible power supply 50-70 is represented by the following equation.

  Therefore, the information processing apparatus 10 receives the input of the connection line thickness r and the lengths X1 to X3, and obtains V1 to V3 by the above formula, thereby setting the output voltage of the uninterruptible power supply 50 to 70. The value can be determined.

  FIG. 7 illustrates a flow of processing executed when the information processing apparatus 10 illustrated in FIG. 1 calculates the set value of the output voltage of each uninterruptible power supply 50 to 70 of the uninterruptible power supply system illustrated in FIG. It is a flowchart to do. Note that the processing of this flowchart is realized by the cooperation of the simulation program 10d1 stored in the HDD 10d and hardware resources. When the processing of this flowchart is started, the following steps are executed.

  Step S10: The CPU 10a receives an input of the number N of uninterruptible power supply devices that operate in parallel from the input device 10i. For example, in the example of FIG. 2, N = 3 is input.

  Step S11: The CPU 10a receives an input of a connection line thickness r (wire diameter) connecting the uninterruptible power supply devices 50 to 70 and the connection point D.

  Step S12: The CPU 10a initializes a value “1” to a variable i for counting the number of processing times.

  Step S13: The CPU 10a receives an input of the length Xi of the connection line connecting the i-th uninterruptible power supply and the connection point D. For example, in the example of FIG. 2, when i = 1, X1 is input as the line length.

  Step S14: The CPU 10a increments the variable i for counting the number of processes by the value “1”.

  Step S15: The CPU 10a determines whether or not the value of the variable i for counting the number of processes is larger than the number N of uninterruptible power supply units that are operated in parallel. If larger, the process proceeds to step S16. Returns to step S13 and repeats the same processing.

  Step S16: The CPU 10a initializes a value “1” to a variable i for counting the number of processing times.

  Step S17: The CPU 10a obtains the impedance (Rr + jω · Lr) per unit length of the connection line whose line thickness is r from the simulation data 10d2, and multiplies it by the line length to obtain the impedance of the connection line. Zi is calculated. For example, in the example of FIG. 2, the impedance shown in Formula (1) is obtained as the impedance of the connection line of the uninterruptible power supply 50.

  Step S18: The CPU 10a acquires the correction value ΔZ of the connection line having the line thickness r and the length Xi from the simulation data 10d2 from the simulation data 10d2 of the HDD 10d, and obtains the corrected impedance value Zi ′. For example, in the example of FIG. 2, the impedance shown in Formula (4) is obtained as the impedance of the connection line of the uninterruptible power supply 50. As described above, the correction value ΔZ is generated based on the value obtained from the actual measurement value and is calculated based on the approximate expression, or is calculated based on the value obtained from the actual measurement value ( For example, a table or the like can be generated and acquired from the database.

  Step S19: When the load of 50% of the maximum load (= 2 · ZLmax) is connected, the CPU 10a assumes that the output current of each uninterruptible power supply is equal to 50% of the maximum current (= Imax / 2) Next, obtain the output voltage of each uninterruptible power supply. For example, in the example of FIG. 2, the output voltage shown in Expression (7) is obtained as the output voltage of the uninterruptible power supply 50. The contact resistance Ri can be obtained from the simulation data 10d2 of the HDD 10d as a value corresponding to the thickness of the connection line. Further, since the contact resistance Ri is often determined depending on the type of the uninterruptible power supply 50 to 70, the user inputs the model number of the uninterruptible power supply 50 to 70 and simulates the value of the contact resistance according to the model number. You may make it acquire from data 10d2.

  Step S20: The output voltage Vi calculated in step S19 is supplied to the video circuit 10e and displayed on the display device 10h. As a result, the value of the output voltage to be set for each uninterruptible power supply is displayed on the display device 10h.

  Step S21: The CPU 10a increments the variable i for counting the number of processes by the value “1”.

  Step S22: The CPU 10a determines whether or not the value of the variable i for counting the number of times of processing is larger than the number N of uninterruptible power supply units that are operated in parallel. Returns to step S17 and repeats the same processing.

  With reference to the output voltages V1 to V3 obtained as described above, the output voltages are set for the control circuits 50h to 70h of the uninterruptible power supply devices 50 to 70, respectively. As a result, the control circuits 50h to 70h control the reference sine wave generation circuit 50f to adjust the amplitude of the sine wave output to the error amplification circuit 50e. As a result, since the uninterruptible power supply devices 50 to 70 output the output voltages V1 to V3 obtained by the above processing, respectively, when the load is 50% of the maximum rated load, FIG. As shown, the output currents of all the uninterruptible power supply units 50 to 70 become equal.

  According to the above processing, the output voltage of each uninterruptible power supply in the uninterruptible power supply system can be easily obtained. For this reason, it is not necessary to perform a load test using a dummy load after the uninterruptible power supply system is installed as in the prior art.

  In the above embodiment, when the impedance value ZL of the load 90 is 50% of the maximum rated load ZLmax, the output currents of all the uninterruptible power supply devices 50 to 70 are 50% of the maximum rated current Imax. However, the output voltage can also be determined by other methods.

  For example, in FIG. 5, when the voltage at point D is V0, the respective output currents I1 to I3 of the uninterruptible power supply devices 50 to 70 are represented by the following equations.

  Here, if the cross current is ignored, the current flowing through the load 90 is represented by the sum of I1 to I3, and therefore the voltage V0 at the point D is represented by the following equation.

  When the load 90 is 50% of the maximum rated load ZLmax, assuming that I1 to I3 are all equal and I1 to I3 = I0, the equation (13) is expressed by the following equation.

  By substituting Equation (14) into Equations (10) to (12) and changing I1 to I3 = I0 and changing each equation, the following equations are obtained.

  Even if such equations (15) to (17) are used, the output voltages V1 to V3 of the uninterruptible power supply devices 50 to 70 can be calculated. In this equation, since the applied voltage V0 to the load 90 is a given value (for example, 100 V or 200 V), V1 to V3 can be obtained by using this given value.

  The above-described embodiments are preferred examples of the present invention, but the present invention is not limited to these, and various modifications and changes can be made without departing from the scope of the present invention. is there.

  For example, in the above embodiment, the case where the uninterruptible power supply system is configured by the three uninterruptible power supply devices 50 to 70 has been described as an example, but for example, by two or four or more uninterruptible power supply devices. It goes without saying that the present invention can be applied to an uninterruptible power supply system configured.

  In the above embodiment, as shown in FIG. 6, the output voltage is determined so that the output currents coincide with each other at a load of 50% of the maximum rated load ZLmax. For example, the output voltage is connected to the uninterruptible power supply system. When the applied load is stable at 60%, the output voltage may be calculated so that the output currents match at 60%. For example, when it fluctuates between 50% and 70%, for example, the output currents may be made to coincide with each other at a median value of 60%. Further, even when the fluctuation is in the range of 50% to 70%, the output current may be made to match at 70% if the time during which the fluctuation is stable at 70% is long. Also, for example, when the load takes two values (for example, when the load is 20% at night and 60% during the day), the output current should be set to match when the load is large (when 60%). That's fine.

  In the above embodiment, the thickness and length of the connection line are input. For example, as simulation data 10d2, the model number of the connection line is associated with the electrical characteristics of the connection line of the model number. When the model number and the length of the connection line are input from the user, the corresponding electrical characteristics may be searched from the simulation data 10d2 and the simulation may be performed.

  Further, although cases have been described with the above embodiments as examples where the information processing apparatus is implemented as a personal computer, it can also be implemented as, for example, a PDA (Personal Digital Assistant) or a mobile phone. Needless to say.

  The above processing functions are realized by a computer as shown in FIG. 1, for example. In that case, a program describing the processing contents of the functions that the information processing apparatus should have is provided. By executing the program on the computer, the processing function is realized on the computer. The program describing the processing contents can be recorded on a computer-readable recording medium. Examples of the computer-readable recording medium include a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory. Examples of the magnetic recording device include a hard disk device (HDD), a flexible disk (FD), and a magnetic tape. Optical disks include DVD, DVD-RAM, CD-ROM, CD-R (Recordable) / RW (Rewritable), and the like. Magneto-optical recording media include MO (Magneto-Optical disk).

  When distributing the program, for example, a portable recording medium such as a DVD or a CD-ROM in which the program is recorded is sold. It is also possible to store the program in a storage device of a server computer and transfer the program from the server computer to another computer via a network.

  The computer that executes the program stores, for example, the program recorded on the portable recording medium or the program transferred from the server computer in its own storage device. Then, the computer reads the program from its own storage device and executes processing according to the program. The computer can also read the program directly from the portable recording medium and execute processing according to the program. In addition, each time the program is transferred from the server computer, the computer can sequentially execute processing according to the received program.

  INDUSTRIAL APPLICABILITY The present invention can be used for an information processing device that obtains each output voltage of an uninterruptible power supply that performs parallel operation.

It is a figure which shows the structural example of the information processing system which concerns on embodiment of this invention. It is a block diagram which shows the structural example of the uninterruptible power supply system used as the process target of the information processing apparatus shown in FIG. It is a block diagram which shows the structural example of the uninterruptible power supply device shown in FIG. It is an equivalent circuit of the uninterruptible power supply system shown in FIG. FIG. 5 is a circuit diagram in a case where contact resistance and deviation from a theoretical value are considered in the equivalent circuit shown in FIG. 4. It is a figure which shows the relationship between the load and electric current of the uninterruptible power supply system shown in FIG. 3 is a flowchart illustrating an example of processing executed in the information processing apparatus illustrated in FIG. 1.

Explanation of symbols

10 Information processing apparatus 10a CPU (calculation means, determination means)
10e Video circuit (presentation means)
10i input device (input means)
50 to 70 Uninterruptible power supply 81 to 84 Connection line 90 Load

Claims (8)

In the information processing apparatus that executes processing for calculating the output voltage of each uninterruptible power supply when operating a plurality of uninterruptible power supplies in parallel,
Input means for receiving input of information on the length of the connection line from each uninterruptible power supply to the connection point, and the thickness of the connection line;
With reference to the information input from the input means, calculating means for calculating the impedance of each connecting line;
Determining means for determining the output voltage of each uninterruptible power supply with reference to the impedance calculated by the calculating means;
Presenting means for presenting the output voltage of each uninterruptible power supply determined by the determining means;
An information processing apparatus comprising:   The information processing apparatus according to claim 1, wherein the calculating unit calculates the impedance by calculating an impedance based on a length and a thickness of the connection line and adding a correction value obtained from an actual measurement value.   The information processing apparatus according to claim 1, wherein the calculation unit calculates the impedance in consideration of a contact resistance of a connection line.   The information processing apparatus according to claim 1, wherein the determining unit determines an output voltage while ignoring a cross current flowing between the uninterruptible power supply apparatuses.   The said determination means determines an output voltage so that the output current of all the uninterruptible power supply devices may become substantially equal when a load of approximately 50% of the maximum rated load is connected. Information processing device.   When the load is constant during operation, the determining means determines the output voltage so that the output currents of all the uninterruptible power supply devices are substantially equal when the load is connected. Item 6. The information processing apparatus according to Item 1. In the output voltage calculation method for calculating the output voltage of each uninterruptible power supply when operating a plurality of uninterruptible power supplies in parallel,
Receives information on the length of the connection line from each uninterruptible power supply to the connection point and the thickness of the connection line,
Calculate the impedance of each connecting line with reference to the input information,
Refer to the calculated impedance, determine the output voltage of each uninterruptible power supply,
Present the determined output voltage of each uninterruptible power supply,
The output voltage calculation method characterized by the above-mentioned. In a computer-readable output voltage calculation program for causing a computer to function to calculate the output voltage of each uninterruptible power supply when operating a plurality of uninterruptible power supplies in parallel,
Computer
An input means for receiving input of information on the length of the connection line from each uninterruptible power supply to the connection point and the thickness of the connection line,
A calculation means for calculating the impedance of each connection line with reference to the information input from the input means;
Determining means for determining the output voltage of each uninterruptible power supply with reference to the impedance calculated by the calculating means;
An output voltage calculation program characterized in that it functions as a program.

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