JPH0564371A - System simulator - Google Patents

Abstract

PURPOSE:To provide a system simulator which, exchanging energy between a digital calculator and an analog device due to a combination of those two devices, performs complicated system simulation including a reaction of an energy generating analog mode and the flow of tidal current, flexibly at real time. CONSTITUTION:When the simulation conditions are so set at a data inputting section 2 that current may be caused to flow from an analog device 16 to a system simulator 13, actual current is caused to flow into a voltage/current outflow and inflow-type amplifier 8 to be absorbed and then the actual current is converted into voltage by an input converter 9 and is inputted in form of digital data into a digital calculator 1A through an insulation amplifier 10 and an A/D converter 11 and is calculated at real time and the result is indicated on an indicating section 12. When the current flow is reversed, the digital data of the digital calculator 1A is converted into voltage by a D/A converter 6 and then is inputted into the voltage/current outflow and inflow-type amplifier 8 through an insulation amplifier 7 and then the actual current is caused to flow out into the analog device 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system simulating device capable of simulating, for example, a power system in real time.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram of a conventional system simulating device disclosed in, for example, Japanese Patent Publication No. 2-27886. Figure 2
In the figure, 1 is a digital computer for calculating transient phenomena of voltage and current in the power system, 2 is a data input section for inputting system conditions, initial values of steady state data, and 3 is a digital value output from the digital computer 1. Is a D / A conversion device for converting into an analog value, 4 is a protective relay device for testing, and 5 is a system simulation device composed of a digital computer 1 and a data input unit 2.

Next, the operation will be described. The digital computer 1 inputs the system data or the system state from the data input unit 2, calculates the transient phenomenon using the general-purpose transient analysis program EMTP under the input conditions, and obtains the resulting voltage, The current data is directly output to the D / A converter 3 as digital data. The D / A converter 3 converts the input digital data into an analog signal and supplies it to the protective relay device 4. The protective relay device 4 outputs the device digital output to the digital computer 1 in accordance with the response and sequence of the protective relay unit. Further, when there is a device digital output of the protective relay device 4, the digital computer 1 calculates by changing the calculation condition of the transient phenomenon, and the voltage / current data under the condition is digitalized as D /
Output to the A converter 3.

[0004]

Since the conventional system simulating device is configured as described above and is intended only for verification of the dynamic characteristic test against the simulated voltage and current of the system fault of the protective relay in the system simulation. There is a problem in that the computer can obtain only the output related to it, and the analog model that generates energy, for example, the mathematical model cannot respond to an analog device having an unknown non-linear characteristic or system simulation that flows a current. ..

The present invention has been made to solve the above problems, and is a system capable of flexibly performing in real time a complex system simulation such as the response of an analog model that generates energy or the flow of tidal current. The purpose is to obtain a simulated device.

[0006]

A system simulation device according to the present invention is a digital computer for performing system calculation, a D / A conversion means for converting the output of the digital computer into an analog signal, and the D / A conversion means. And an A / D conversion means for converting the output of the analog device into an analog-digital signal and supplying it to the digital computer.

[0007]

In the present invention, the digital output (voltage) of the digital computer that is performing the system calculation in real time is digital-analog converted by the D / A conversion means,
The analog output (voltage) is amplified by an amplifier and converted into a current, or is supplied as it is to an analog device as a voltage. Further, the output (current or voltage) of the analog device is analog-digital converted by the A / D conversion means, and the digital output (voltage) is fed back to the digital computer to simulate the system.

[0008]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, in which 2 is the same as the conventional device. 1A is a digital computer for performing system calculation in real time, and 6 is an analog output (voltage) by digital-analog converting the digital output of the digital computer 1A.
Is provided on the output side of the D / A conversion apparatus 6, and an isolation amplifier for protecting the D / A conversion apparatus 6 and the digital computer 1A, and 8 is provided on the output side of the isolation amplifier 7. Digital computer 1A that simulates tidal current
The input / output (voltage) and the input / output (for example, current) of an analog device to be described later have a conversion function of converting voltage / current outflow / inflow type in real time including the flowing direction, and 9 is a current on the analog device side. Input converter for converting to voltage, 1
0 is an isolation amplifier which is provided on the output side of the input converter 9 and protects the digital computer 1A from an A / D conversion device described later,
Reference numeral 11 is an A / D converter for analog-digital converting the output (analog voltage) of the isolation amplifier 10 and supplying it to the digital computer 1A. Reference numeral 12 is connected to the digital computer 1A and displays a simulated state by, for example, a CRT or a printer. A display unit, 13 is a system simulator including the digital computer 1A to display unit 12, 14 is a generator, 15 is a coil,
Reference numeral 16 is an analog device including an electric generator 14 and a coil 15 as an analog model for generating energy. The D / A converter device 6 and the isolation amplifier 7
Constitutes a D / A conversion means, and the input converter 9, the isolation amplifier 10 and the A / D conversion device 11 constitute an A / D conversion device.

Next, the operation will be described. The simulation condition is digitally set in the computer 1A by the data input unit 2, and the generator 14 of the analog device 16 is now connected to the coil 1A.
When a power flow is flowing to the system simulating device 13 simulating the electric power system via 5, the actual current from the analog device 16 is supplied to the voltage / current outflow / inflow amplifier 8 via the primary side of the input converter 9. It flows and is absorbed, at which time the input converter 9
Of the current flowing through the primary side of the converter is converted into a voltage on the secondary side thereof and taken out, and this voltage is passed through the isolation amplifier 10 to A /
The digital value is supplied to the D converter 11 and subjected to analog-digital conversion, and the digital value is supplied to the digital computer 1A. The digital computer 1A uses the input digital value to determine the current (or voltage) on the analog device 16 side,
Real-time system simulation is performed by calculating the frequency and phase.

Further, the power flow is reversed, and the system simulation device 1
In the case of flowing from 3 to the analog device 16, the digital value from the digital computer 1A and the D / A conversion device 6 are converted into an analog value (voltage) and the voltage / voltage is supplied via the isolation amplifier 7.
It is supplied to the current outflow inflow amplifier 8 and converted into an actual current corresponding to the analog value (voltage) input here, and this current is passed through the primary side of the input converter 9 to the analog device 16
Is leaked to. Then, the input converter 9 takes out a voltage corresponding to the current flowing through the primary side to the secondary side, and feeds this voltage back to the digital computer 1A via the isolation amplifier 10 and the A / D conversion device 11. ,
The digital computer 1A can detect a change in the current state of the analog device 16, control the current, frequency, phase, etc., and perform real-time system simulation. The simulated state in the digital computer 1A is displayed on the display unit 12
Displayed in.

Embodiment 2. In the above embodiment, the case where the voltage / current outflow / inflow type amplifier 9 for the current is provided has been described, but the voltage may be simulated by providing the voltage amplifier for the voltage. In this case, as the input converter 9, for example, voltage-voltage conversion such as a converter is used.

Embodiment 3. Further, in the above embodiment, the analog device is shown to have a single phase, but it may have three phases. Further, in the above-described embodiment, the real-time system simulation using the system simulation device 13 and the analog device 16 has been described. However, a test device for an analog device that generates energy such as a generator may be used, similar to the above-described embodiment. Produce the effect of. Further, although the above embodiment has been described with respect to the case of a large-scale power system, it can be similarly applied to other systems, for example, a small-scale circuit system.

[0013]

As described above, according to the present invention, the digital computer for performing the system calculation, the D / A converting means for converting the output of the digital computer into the analog, and the output of the D / A converting means. Since it has an amplifier for amplifying and supplying the analog signal to an analog device and an A / D conversion means for converting the output of the analog device into an analog-digital signal and supplying it to the digital computer, the response of the analog model for generating energy is provided. There is an effect that it is possible to obtain a system simulation device capable of flexibly performing complicated system simulation such as flowing a current or a tidal current in real time.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional system simulation device.

[Explanation of symbols]

 1A Digital computer 6 D / A converter 7 Amplifier 8 Voltage / current outflow / inflow amplifier 9 Input converter 10 Insulation amplifier 11 A / D converter 13 System simulator 16 Analog device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Noguchi 1-2-2 Wadazaki-cho, Hyogo-ku, Kobe Sanryo Electric Co., Ltd. Control Works (72) Inventor Takahiro Takahashi 6-1, Hamayama-dori, Hyogo-ku, Kobe No. 1 Mitsubishi Electric Engineering Co., Ltd. Kobe Office (72) Inventor Nobuyuki Sato 2-4-1, Nishitsujikeoka, Chofu City, Tokyo Metropolitan Technology Research Laboratory (72) Inventor Taro Nakazawa 2 Nishiazajigaoka, Chofu City, Tokyo 4-1-1 TEPCO Technical Research Institute

Claims (1)

[Claims] 1. A digital computer for performing system calculation, a D / A conversion means for converting the output of the digital computer into an analog signal, and an amplifier for amplifying the output of the D / A conversion means and supplying it to an analog device. , A / D conversion means for converting the output of the analog device into analog-digital and supplying it to the digital computer.