JP2002084659A - Power system analyzing simulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To analyze a power system to be an object of analog processing and a power system to be an object of digital processing, as one power system. SOLUTION: On the occasion of simulating and analyzing a power system 21 analyzable with a digital model by the use of a real-time digital simulator RDS, and analyzing a power system 22 simulating it by the use of an analog simulator ANS, both simulators are connected to each other with an interface circuit INF, and voltages between both ends of impedances 23, 24 common to the power systems 21, 22 are exchanged with each other. A first voltage command value is found, from a detected value of a voltage detector 33 with a first arithmetic and logic unit 35, and this voltage command value is reflected on the output of a voltage amplifier 26. A second voltage command value is found from a detected value of a voltage detector 34 with a second arithmetic and logic unit 34, and this voltage command value is reflected on the output of a voltage source model 25, and the power systems 21, 22 are analyzed as one power system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system analysis simulator, and more particularly to a power system analysis simulator suitable for analyzing a large-scale and complicated power system by combining an analog simulator and a real-time digital simulator. About.

[0002]

2. Description of the Related Art In an electric power system, wide-area interconnection has been promoted for efficient operation and improvement of reliability of the system. In addition, various power electronics devices and distributed power supplies are being introduced for system stabilization, and the power system is becoming increasingly large-scale.
It tends to be complicated. For this reason, the necessity of grasping the situation by analyzing the power system, grasping the problem in advance, and taking countermeasures is increasing, and detailed analysis of a large-scale and complicated system is required.

As a power system analyzer, a real-time digital simulator (RDS), which has advantages such as compactness, quick and easy startup of analysis, and easy parameter change, has recently been developed. Used for verification and testing of protective equipment.

[0004] Against this background, there has been an increasing need for the development of conventional analyzers combining an analog simulator and a digital simulator. However, detailed reports on the coupling method and the analysis device when analyzing the power system by combining the analog simulator and the digital simulator have been scarce and not clear. For this reason, when a conventional analog simulator and a digital simulator are combined, as an analog simulator, phenomena that are difficult to model with digital processing,
A device that simulates and analyzes the dynamic characteristics of a device or control device that is difficult to simulate due to a small analysis interval time is used.A digital simulator that simulates a device or device whose phenomena is known and whose modeling is known is used. Will be done.

[0005]

When a conventional analog simulator and a digital simulator are used in combination for analysis, the analog simulator continuously performs voltage and current phenomena and can perform detection continuously. The delay due to sampling when passing is not a major problem. On the other hand, in the real-time digital simulator, since the calculation step time exists and the result is a discrete value, the sampling time of the signal exchange with the analog simulator becomes a problem. In particular, when the system scale becomes large, the analysis step by the digital simulator becomes longer, and the time for exchanging signals with the analog simulator becomes longer, so the analysis result at the connection with the analog simulator oscillates, making it impossible to calculate accurately. .

An object of the present invention is to provide a power system analysis simulator capable of analyzing a power system to be subjected to analog processing and a power system to be subjected to digital processing as a single power system.

In order to solve the above-mentioned problems, the present invention provides a real-time digital simulator which simulates and analyzes a first electric power system obtained by reducing an electric power system which can be analyzed by a digital model. An analog simulator that simulates and analyzes a second power system obtained by reducing a power system that can be analyzed by an analog model, and an interface circuit that mediates transmission and reception of information between the analog simulator and the real-time simulator. Wherein the real-time digital simulator comprises:
A first common power common to the first power system and the second power system
First power supply means connected through a common impedance of the first power supply means, and first state quantity detection means for detecting a state quantity at a connection point between the first common impedance and the first power system. , The analog simulator comprises: a second power supply means connected via a second common impedance common to the first power system and the second power system; Second state quantity detection means for detecting a state quantity at a connection point with the power system, and the interface circuit detects a second state quantity for the second power supply means from a detection value of the first state quantity detection means. 1 for calculating the first command value and reflecting the calculation result to the second power supply means, and a second command for the first power supply means based on the detection value of the second state quantity detection means. Calculate value This is a calculation result obtained by configuring the first power system analysis simulator comprising a second arithmetic means to be reflected in the power supply unit.

[0007] In configuring the power system analysis simulator, the following elements can be added.

(1) The first calculating means calculates a first command value by taking in a state quantity from the first state quantity detecting means at each step time, and calculates a past command value during each step time. A predicted value for interpolating the first command value is calculated from the state quantity of (i), and the calculation result of the predicted value is reflected on the second power supply means.

(2) The first state quantity detecting means and the second state quantity detecting means detect a voltage as a state quantity, and
Calculating means calculates a first voltage command value from the detection value of the first state quantity detecting means, and the second calculating means calculates a second voltage command value from the detection value of the second state quantity detecting means. The first power supply means is constituted by a voltage source model, and the second power supply means is constituted by a voltage amplifier.

(3) The first state quantity detecting means and the second state quantity detecting means detect a current as a state quantity, and
Calculating means for calculating a first voltage command value from a detection value of the first state quantity detecting means and an equivalent impedance of the second power system viewed from the second power supply means, The calculating means is configured to detect the detected value of the second state quantity detecting means and the first state quantity.
Calculating a second voltage command value from the equivalent impedance of the first power system viewed from the power supply means, wherein the first power supply means is constituted by a voltage source model, and wherein the second power supply means It consists of a voltage amplifier.

(4) The first state quantity detecting means and the second state quantity detecting means detect a current as a state quantity, and
Calculating means calculates a first current command value from a detection value of the first state quantity detecting means, and the second calculating means calculates a second current command value from a detection value of the second state quantity detecting means. The first power supply means is constituted by a current source model, and the second power supply means is constituted by a current amplifier.

(5) The first state quantity detecting means detects a voltage as a state quantity, the second state quantity detecting means detects a current as a state quantity, and the first calculating means detects a first state. A first voltage command value is calculated from a detection value of the quantity detection means, and the second calculation means calculates a second current command value from a detection value of the second state quantity detection means; The power supply means is constituted by a current source model, and the second power supply means is constituted by a voltage amplifier.

(6) The first state quantity detecting means and the second state quantity detecting means detect a voltage as a state quantity, and
Calculating means for calculating a first current command value from a detection value of the first state quantity detecting means and an equivalent impedance of the second power system viewed from the second power supply means, The calculating means is configured to detect the detected value of the second state quantity detecting means and the first state quantity.
A second current command value is calculated from the equivalent impedance of the first power system as viewed from the power supply means, and the first power supply means is constituted by a current source model, and the second power supply means It consists of a current amplifier.

According to the above-mentioned means, the state quantity detected by the analog simulator and the state quantity detected by the real-time digital simulator are mutually exchanged and reflected on the output of each power supply means. By connecting the power system simulated by the above and the power system simulated by the analog simulator, it is possible to analyze as a single power system.

Further, when the first calculating means calculates the first command value by taking in the state quantity at every step time from the first state quantity detecting means, when the first command value is calculated, the past command value is calculated during each step time. Since a predicted value for interpolating the first command value is calculated from the state quantity and the calculated result of the predicted value is reflected on the second power supply means, the analysis step by the digital simulator is particularly long. Therefore, even when the time for exchanging signals with the analog simulator becomes long, the analysis of the system can be performed with high accuracy without causing vibration in the analysis result.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a power system analysis simulator according to a first embodiment of the present invention. In FIG. 1, a power system analysis simulator includes a real-time digital simulator RDS that simulates and analyzes a first power system 21 that is a reduced model of a power system that can be analyzed with a digital model, and a power system that can be analyzed with an analog model. An analog simulator ANS that simulates and analyzes the second power system 22 that is a reduced model of the above, and an interface circuit INF that mediates the exchange of information between the analog simulator ANS and the real-time digital simulator RDS. It is configured.

[0017] Real-time digital simulator RD
S has an analysis engine microprocessor or digital signal processor and software (software). This software simulates the power system (PS1) 21 that can be analyzed by a digital model, for example, to know the phenomenon. It is supposed to. Further, the real-time digital simulator RDS is provided with the first power system 2
A voltage source model 25 as a first power supply means connected to the first and second power systems 22 via a first common impedance 23 common to the first and second power systems 22; AC voltage detector 33 with the first state quantity detecting means for detecting the state quantity (voltage) at the connection point
The AC voltage detector 33 is connected to the first arithmetic unit 35 of the interface circuit INF, and the voltage source model 25 is connected to the second arithmetic unit 3 of the interface circuit INF.
6 is connected. Here, the voltage source model 25 is an equivalent voltage source representing a digital simulator coupling unit simulated by the analog simulator ANS, and functions as a constant voltage source having a fixed frequency, voltage amplitude, and phase.

The analog simulator ANS is constituted by a miniature model of a real system, and simulates a power system 22 including a model of a device or an apparatus which is difficult to analyze by digital processing and has a fast response and a small time constant. It will be analyzed. Further, the analog simulator ANS includes a first power system 21 and a second power system 22.
, A voltage amplifier 26 as a second power supply means connected through a second common impedance 24 common to the first and second common impedances 24, and a state quantity (voltage) at a connection point between the second common impedance 24 and the second power system 22. , And an AC voltage detector 34 as a second state quantity detecting means for detecting the voltage change. The AC voltage detector 34 is connected to the second arithmetic unit 36 of the interface circuit INF, and the voltage amplifier 26 is connected to the interface circuit INF. It is connected to the first arithmetic unit 35. Here, the voltage amplifier 26 is an equivalent voltage source representing an analog simulator coupling unit simulated by the real-time digital simulator RDS, and has an input signal (command value).
Is amplified.

The interface circuit INF supplies the first voltage to the voltage amplifier 26 based on the value detected by the AC voltage detector 33.
A first voltage command value is calculated as a command value of the first voltage, and a calculation device 35 as first calculation means for reflecting the calculation result on the output of the voltage amplifier 26, and a voltage source model based on a detection value of the AC voltage detector 34. 25 as the second command value for
Calculation device 36 as second calculation means for calculating the voltage command value of
It is comprised including. In the arithmetic unit 35, the first
When calculating the voltage command value of the AC voltage detector 3
The voltage value detected by 3 is converted into a par unit (pu) according to the rated value of the power system 22 simulated by the analog simulator ANS. Further, when calculating the second voltage command value in the arithmetic unit 36, the voltage value detected by the voltage detector 34 is adjusted according to the rated value of the power system 21 simulated by the real-time digital simulator RDS. ) To convert.

In the power system analysis simulator having the above configuration, a real-time digital simulator RD
When the S and the analog simulator ANS are coupled, the voltage at both ends of the impedance is exchanged by using the impedance of a transmission line or a device of a power system.

This is because the two power systems simulated by the digital simulator RDS and the analog simulator ANS are connected to each other and analyzed as one power system by exchanging the voltage across the common impedance. The reason why it can be analyzed as one electric power system by linking the power systems will be described.

Assuming that the impedance common to the analog simulator ANS and the digital simulator RDS is Xe, and the voltages at both ends are V1 and V2, the active power P flowing through Xe is given by the following equation (1).

[0023]

P = V1 · V2 sin θ / Xe where θ represents the phase difference between V1 and V2. Also, Xe
Is given by equation (2).

[0024]

Q = (V1 · V2 cos θ−V2 · V2) / Xe When V1 and V2 at both ends of the impedance are determined, it means that the active power and the reactive power flowing through the impedance are uniquely determined. Here, V1 and V2 are detection values V1 (t) of the AC voltage detector 33 in the digital simulator RDS.
And the voltage V2 (t−τ) of the voltage source model 25. In the analog simulator ANS, the voltage V2 of the voltage amplifier 26
1 (t−τ) and the detected value V2 of the AC voltage detector 34. Therefore, by exchanging the voltages detected by the AC voltage detectors 33 and 34 with the analog simulator ANS and the digital simulator RDS via the interface circuit INF, it is possible to match the power flows in the common impedance of the digital simulator RDS and the analog simulator ANS. It is possible to perform an analysis combining these.

That is, the voltage source model 2 of the power system 21, the common impedance Xe, and the system voltage V2 detected by the power system 22 simulated by the analog simulator ANS.
5 is constituted by a digital simulator RDS, and a power system 22, a common impedance Xe, and a voltage amplifier 26 serving as a voltage source of a system voltage V1 detected by the power system 21 simulated by the digital simulator RDS are constituted by an analog simulator ANS. . Thereby, the active power and the reactive power flow between the two simulators can be matched, and the analysis of the power system connected by the two simulators can be performed.

However, when the power system simulated by the digital simulator RDS becomes large-scale and complicated, a step time (sampling timing) for real-time analysis is used.
Must be increased, and the change in the voltage and the change in the current at the coupling portion increase. Especially analog simulator A
Since NS has a stray capacitance and a stray inductance, if the voltage command value or the current command value from the digital simulator RDS greatly changes in a stepwise manner, it causes noise. For this reason, the first arithmetic unit 35 of the interface device INF has a function of interpolating data during the interval time of the digital simulator RDS as a function of interpolating a voltage as a state quantity from the AC voltage detector 33 at each interval time. In the process of calculating the voltage command value, a prediction value for interpolating the first voltage command value is calculated from the past state quantity (voltage) during each interval time, and the calculation result of the prediction value is calculated by the voltage amplifier 26. Functions are added to reflect the output.

Next, according to FIG.
Will be described. FIG. 2A shows a processing flow, and FIG. 2B shows a time sequence. In the process, first, the voltage V1 (Tn) [n = 1, 2, 3,...] At the detection point is fetched by the AC voltage detector 33 as data at every interval time ΔT, and the data is stored. In the prediction calculation, a voltage command value to the analog simulator ANS is calculated using the stored data. The predicted value can be easily obtained by the following equation, for example.

[0028]

## EQU3 ## V1 (Tn + tk) = V1 (Tn) + k.multidot..DELTA.V
1 (Tn) k = 1, 2,..., M−1 where m: the number of divisions within the analysis interval time ΔV1 (Tn) = (V1 (Tn) −V1 (Tn−1))
/ M Tn, Tn−1 (= Tn−ΔT): output time of digital simulator ΔT: analysis step time of digital simulator tk = k · ΔT / m Tn + tm is output time T of digital simulator
n, the output time Tn + 1 (= Tn + Δ
T), and V1 (Tn + tm) at that time is not a predicted value but a detected value V1 (Tn + 1) based on the analysis result.

The predicted value is tk (= k · Δ) until the next data is output from the digital simulator RDS.
T / m) is output to the voltage amplifier 26 of the analog simulator ANS. The time sequence is shown in FIG.
t1 'is the time required for data capture and storage, t2'
Represents the time required for calculating the predicted value, and t3 'represents the time required for outputting the predicted value. According to the above equation, once the prediction value is calculated, it is simple because the calculation is performed only by sequentially adding ΔV1 (Tn). The calculation after the output at the time of the first Tn + t1 takes almost no calculation time.

Although the simplest example of obtaining the predicted value of V1 has been described above, it is also possible to perform more accurate prediction by using a value of V1 in the past.

The timing for outputting the predicted value is generated by a distribution circuit based on a clock signal synchronized with the step time of the digital simulator RDS, and the predicted value is output to the analog simulator ANS at time intervals obtained by dividing the step time by m. .

As described above, according to the present embodiment, analysis of a single power system in which the power system 22 simulated by the analog simulator ANS and the power system 21 simulated by the real-time digital simulator RDS are performed with high accuracy. And a large-scale and complicated power system can be analyzed efficiently. Furthermore, even when the time required for the analysis by the digital simulator becomes longer and the time for exchanging signals with the analog simulator becomes longer, the analysis of the system can be performed with high accuracy without causing vibration in the analysis results.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a configuration diagram of a hybrid power system analysis simulator including a real-time digital simulator RDS and an analog simulator ANS.
In the present embodiment, the AC voltage detectors 33 and 34 are replaced with the power systems 21 and 22 and the common impedance 2.
1 is different from that of FIG. 1 in that AC current detectors 37 and 38 for detecting an AC current at respective connection points with 3 and 24 are used. This is analog simulator A
In NS, current detection can be performed faster than voltage detection, and the delay time for coupling can be reduced accordingly.

In this case, each of the arithmetic units 35 and 36 multiplies the current value flowing through the common impedances 23 and 24 by the impedance to generate a voltage command value to the voltage source model 25 and the voltage amplifier 26. Therefore, in the digital simulator RDS, the equivalent impedance of the power system 22 as viewed from the voltage amplifier 26 of the analog simulator ANS is necessary.
In S, voltage source model 2 of digital simulator RDS
5, the equivalent impedance of the power system 21 is required. For this reason, when analyzing the power system, it is necessary to prepare in advance, for example, a rough impedance from a system diagram. Note that the prediction operation is performed by the first arithmetic unit 35, which is the same processing as that in FIG. Further, the predicted value of the voltage command value may be obtained by using the current detection value detected by the AC current detector 37. However, it is troublesome to convert the detected current value to the voltage command value by multiplying by the equivalent impedance. Therefore, when the voltage command value is obtained, it is preferable to calculate the predicted value of the voltage command value in the same manner as in the calculation by the above equation (3).

According to the present embodiment, it is possible to analyze a single power system in which the power system 22 simulated by the analog simulator ANS and the power system 21 simulated by the real-time digital simulator RDS are combined with high accuracy. A large-scale and complicated power system can be analyzed efficiently. Furthermore, even when the time required for the analysis by the digital simulator becomes longer and the time for exchanging signals with the analog simulator becomes longer, the analysis of the system can be performed with high accuracy without causing vibration in the analysis results.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a configuration diagram of a power system analysis simulator including a real-time digital simulator RDS and an analog simulator ANS. In FIG.
This embodiment is different from that of FIG. 3 in that a current source model 27 and a current amplifier 28 are used instead of the voltage source model 25 and the voltage amplifier 26.

The computing devices 35 and 36 in the present embodiment compute a first current command value and a second current command value from the detection values of the current detectors 37 and 38, and divide this computation result into a current source model 27. 3 is reflected on the output of the current amplifier 28.
There is an advantage that the trouble of calculating the voltage command value by multiplying the current detection value by the impedance at 36 is eliminated.

However, the current amplifier 28 is
However, there is a dislike that the response of the output to the command value takes a longer time and the delay of the coupling increases.

The predicted value of the current command value can be easily obtained by replacing the voltage detection value of Equation 3 with a current detection value.

According to the present embodiment, it is possible to analyze a single power system in which the power system 22 simulated by the analog simulator ANS and the power system 21 simulated by the real-time digital simulator RDS are combined with high accuracy. A large-scale and complicated power system can be analyzed efficiently. Furthermore, even when the time required for the analysis by the digital simulator becomes longer and the time for exchanging signals with the analog simulator becomes longer, the analysis of the system can be performed with high accuracy without causing vibration in the analysis results.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a configuration diagram of a power system analysis simulator including a real-time digital simulator RDS and an analog simulator ANS. In FIG.
In this embodiment, the digital simulator RDS is provided with a current source model 27 as a current source based on the current value detected on the analog simulator ANS side, and the analog simulator ANS is used as a voltage source based on the voltage value detected on the digital simulator RDS side. Is provided.

First arithmetic unit 35 in this embodiment
Calculates the first voltage command value from the detection value of the AC voltage detector 33, reflects the calculation result on the output of the voltage amplifier 26, and calculates the first voltage command value from the detection value of the second calculation device 36 and the AC current detector 38. The second current command value is calculated, and the calculation result is reflected on the output of the current source model 27.

In this embodiment, since the analog simulator ANS is provided with the AC current detector 38 and the voltage amplifier 26 with a fast output response, the delay of the coupling is small. It is possible to accurately analyze a large-scale complicated AC system. The calculation of the predicted value by the first calculation device is the same as that in the case of FIG.

According to the present embodiment, it is possible to analyze a single power system in which the power system 22 simulated by the analog simulator ANS and the power system 21 simulated by the real-time digital simulator RDS are combined with high accuracy. A large-scale and complicated power system can be analyzed efficiently. Furthermore, even when the time required for the analysis by the digital simulator becomes longer and the time for exchanging signals with the analog simulator becomes longer, the analysis of the system can be performed with high accuracy without causing vibration in the analysis results.

Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a configuration diagram of a power system analysis simulator including a real-time digital simulator RDS and an analog simulator ANS. In FIG.
In the present embodiment, the current source model 27 shown in FIG. 4 is provided in place of the voltage source model 25 shown in FIG. 1, and the current amplifier 28 shown in FIG.
Other configurations are the same as those in FIG.

In the first arithmetic unit 35 of the present embodiment, the first current command value is obtained by dividing the detection value of the AC voltage detector 33 by the equivalent impedance of the second power system 22 as viewed from the voltage amplifier 26. The second arithmetic unit 36 calculates the second current command value by dividing the detection value of the AC voltage detector 34 by the equivalent impedance of the first power system 21 viewed from the current source model 27. Therefore, as compared with FIG. 1, it is necessary to perform an operation of dividing the detected voltage value by the equivalent impedance and converting it into a current command value.

In the prediction operation performed by the first arithmetic unit 35, the predicted value of the current command value may be obtained by dividing the voltage detection value detected by the AC voltage detector 33 by impedance and calculating the current command value. At the stage when the command value is obtained, it is preferable to calculate the predicted value of the current command value in the same manner as the calculation using Expression 3.

There is also a method of connecting an analog simulator and a digital simulator using a distributed constant line. In this case, too, when a command value is output from the digital simulator to the analog simulator, the connection using the above-described predicted value is performed. Obviously, the method can be used. Even in this coupling method, by taking a method of interpolating the command value during the analysis step of the digital simulator, it is possible to prevent the occurrence of noise in the state quantity of voltage and current due to a large step change of the command value, and to achieve accurate analysis. I can do it.

According to the present embodiment, it is possible to analyze a single power system in which the power system 22 simulated by the analog simulator ANS and the power system 21 simulated by the real-time digital simulator RDS are combined with high accuracy. A large-scale and complicated power system can be analyzed efficiently. Furthermore, even when the time required for the analysis by the digital simulator becomes longer and the time for exchanging signals with the analog simulator becomes longer, the analysis of the system can be performed with high accuracy without causing vibration in the analysis results.

[0050]

As described above, according to the present invention,
Since the state quantity detected by the analog simulator and the state quantity detected by the real-time digital simulator are exchanged and reflected on the output of each power supply means, the simulation is performed by the power system simulated by the real-time digital simulator and the analog simulator. The connected power systems can be connected and analyzed as a single power system.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power system analysis simulator according to a first embodiment of the present invention, which includes an analog simulator and a real-time digital simulator.

FIG. 2 shows a processing flow of a prediction operation of the simulator shown in FIG. 1 and a time sequence of the processing.

FIG. 3 is a configuration diagram of a power system analysis simulator according to a second embodiment of the present invention, which includes an analog simulator using a current detection value for coupling and a real-time digital simulator.

FIG. 4 is a configuration diagram of a power system analysis simulator including an analog simulator using a coupling current amplifier and a real-time digital simulator according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a power system analysis simulator according to a fourth embodiment of the present invention, which includes an analog simulator using a current amplifier and a voltage amplifier for coupling and a real-time digital simulator.

FIG. 6 is a configuration diagram of a power system analysis simulator according to a fifth embodiment of the present invention, which includes an analog simulator using a voltage detector and a current amplifier for coupling, and a real-time digital simulator.

[Explanation of symbols]

 RDS Real-time digital simulator ANS Analog simulator INF Interface circuit 21, 22 Power system 23, 24 Common impedance 25 Voltage source model 26 Voltage amplifier 27 Current source model 28 Current amplifier 33, 34 AC voltage detector 35 First arithmetic unit 36 Second Arithmetic units 37, 38 AC current detectors,

Claims (7)

[Claims] A real-time digital simulator for simulating and analyzing a first power system in which a power system that can be analyzed by a digital model is reduced, and a second real-time simulator in which a power system that can be analyzed by an analog model is reduced. An analog simulator that simulates and analyzes the power system of No. 2 and an interface circuit that mediates the transmission and reception of information between the analog simulator and the real-time simulator.
A first common power common to the first power system and the second power system
First power supply means connected through a common impedance of the first power supply means, and first state quantity detection means for detecting a state quantity at a connection point between the first common impedance and the first power system. , The analog simulator comprises: a second power supply means connected via a second common impedance common to the first power system and the second power system; Second state quantity detection means for detecting a state quantity at a connection point with the power system, and the interface circuit detects a second state quantity for the second power supply means from a detection value of the first state quantity detection means. 1 for calculating the first command value and reflecting the calculation result to the second power supply means, and a second command for the first power supply means based on the detection value of the second state quantity detection means. Calculate value Second calculating means and the power system analysis simulator comprising a to reflect the result of the calculation to the first power supply means. 2. The power system analysis simulator according to claim 1, wherein said first calculating means fetches a state quantity from said first state quantity detecting means at every step time to calculate a first command value. And calculating a predicted value for interpolating the first command value from the past state quantity during each step time, and reflecting the calculated result of the predicted value on the second power supply means. Characteristic power system analysis simulator. 3. The power system analysis simulator according to claim 1, wherein said first state quantity detecting means and said second state quantity detecting means detect a voltage as a state quantity, and said first calculating means. Calculates a first voltage command value from the detection value of the first state quantity detection means, and the second calculation means calculates a second voltage command value from the detection value of the second state quantity detection means. Wherein the first power supply means is constituted by a voltage source model and the second power supply means is constituted by a voltage amplifier. 4. The power system analysis simulator according to claim 1, wherein said first state quantity detecting means and said second state quantity detecting means detect a current as a state quantity, and said first calculating means. Calculates a first voltage command value from a detection value of a first state quantity detection means and an equivalent impedance of the second power system viewed from the second power supply means, and the second calculation means Calculating a second voltage command value from a detection value of the second state quantity detection means and an equivalent impedance of the first power system viewed from the first power supply means, Is composed of a voltage source model, and the second
A power supply means comprising a voltage amplifier. 5. The power system analysis simulator according to claim 1, wherein said first state quantity detection means and said second state quantity detection means detect a current as a state quantity, and said first calculation means. Calculates the first current command value from the detection value of the first state quantity detection means, and the second calculation means calculates the second current command value from the detection value of the second state quantity detection means. Wherein the first power supply means is constituted by a current source model and the second power supply means is constituted by a current amplifier. 6. The power system analysis simulator according to claim 1, wherein the first state quantity detecting means detects a voltage as a state quantity, and the second state quantity detecting means detects a current as a state quantity. The first calculating means calculates a first voltage command value from a detection value of the first state quantity detecting means;
The second computing means computes a second current command value from a detection value of the second state quantity detecting means, the first power supply means is constituted by a current source model, and the second power supply means Is a power system analysis simulator comprising a voltage amplifier. 7. The power system analysis simulator according to claim 1, wherein the first state quantity detecting means and the second state quantity detecting means detect a voltage as a state quantity, and the first calculating means. Calculates a first current command value from a detection value of a first state quantity detection means and an equivalent impedance of the second power system viewed from the second power supply means, and the second calculation means Calculating a second current command value from a detection value of the second state quantity detection means and an equivalent impedance of the first power system viewed from the first power supply means, Is composed of a current source model, and the second
Wherein the power supply means comprises a current amplifier.