JP4437697B2 - Method for determining combined stability of power generation equipment and power converter - Google Patents

Description

  The present invention is a combination of a power generation facility composed of a generator driven by a turbine or diesel engine using oil, gas thermal power, etc., a power converter connected to the generator, and a load facility composed of the load The present invention relates to a method for determining stability in an operating state, and particularly relates to a method for determining in advance the stability of a combined state by grasping individual characteristics of each of the power generation equipment and the power conversion device.

  2. Description of the Related Art Conventionally, not only control signals are exchanged between devices of each facility in a power plant, but also power itself is exchanged. In the above devices, since each device becomes a high-quality power supply source with respect to fluctuations in various loads, there is a trend toward improvement of quick response and miniaturization. On the other hand, in the state where each device is combined, the control system of each device operates separately, so when the natural frequency of each device matches or approaches, resonance and divergence between devices occur. Can occur and cause significant damage. The natural frequency here refers to a specific frequency that is superimposed on the electrical and mechanical outputs not only at the time of steady state but also when the load fluctuates, except for the device rated frequency.

Such a resonance phenomenon and a divergence phenomenon are observed between the power generation facility 100 and the load device 200 having the configuration shown in FIG. The power generation facility 100 includes a drive machine 1 such as a gas turbine, a speed governor 2, a generator 3, an automatic voltage regulator 4, and a coupling device 5 that couples the drive machine 1 and the generator 3.
The load device 200 includes a power conversion device 6 that is a load of the power generation facility 100, a control device 7 for the power conversion device 6, and a load 8 for the power conversion device 6. The power conversion device 6 is used for improving the efficiency of power facilities, enhancing the function of the power system, or taking measures against a voltage sag, and typical examples thereof include an inverter for driving a motor and an uninterruptible power supply. The power conversion device 6 uses semiconductor elements such as diodes, thyristors, IGBTs, etc., and the control device 7 controls the frequency, voltage, current, or power, so these devices are generally called active devices. Yes. When a wide range of control characteristics of the control system of each component of the load facility 200 matches the natural frequency of the power generation facility 100, a resonance phenomenon or a divergence phenomenon occurs between the power generation facility 100 and the load facility 200. .

In order to prevent the occurrence of such resonance and divergence, safety has been confirmed by the following cases (1) to (3).
(1) Preliminary determination of stability in a state where the power generation facility 100 and the load facility 200 are combined is not performed, and measures are taken whenever a resonance or divergence phenomenon occurs in a combination test at a plant construction site.
(2) As prior verification, a large-scale computer simulation simulating the power generation facility 100 and the load facility 200 in detail is performed (see, for example, Non-Patent Document 1).
However, since the method disclosed in Non-Patent Document 1 requires a great deal of time and expense, it is only applied to a limited number of power plants.
(3) A large-scale simulator test simulating the power generation facility 100 and the load facility 200 in detail is performed. However, this method is also not practical because it requires a large-scale dedicated facility and a large amount of cost. Therefore, it is shown that partial preliminary verification is performed by a simulator device that simulates an electric power system (load), a generator, an exciter, and an automatic voltage regulator (AVR) that constitute a part of the plant system (for example, patents). Reference 2).

  In other words, the conventional stability determination is performed when simulation calculations and simulator tests as shown in the cases (2) and (3) are limited, and the rest are combinations at the plant site shown in the case (1). Has been done by testing.

Examination of stability of CVCF and emergency generator 1986 National Congress of the Institute of Electrical Engineers (page 676) Japanese Patent Publication No. 2896039 (FIG. 2)

  However, in order to determine stability, there is a problem in any of the conventional methods described above, and it is appropriate for the shortening of the plant construction process including the local process and the demand for cost reduction. It is impossible to take corrective actions. The present invention has been made to solve the above-described problems, by independently testing each of the power generation equipment and the power conversion device without carrying out a large-scale simulation calculation or a large-scale simulation test. It is an object of the present invention to provide a method for grasping the unit characteristics and determining the stability of the combined state in advance.

In the method for determining the combined stability of the power generation equipment and the power conversion device according to the present invention, the power generation equipment is provided with a generator and a drive unit that drives the power generator,
Before the power generation facility, the power conversion device, and the load connected to the power conversion device are combined, the power generation facility and the power conversion device are each separately tested.
The power generation facility test is performed by combining the test resistance load added to the power generation facility to analyze the frequency obtained to obtain the first natural frequency, and the power conversion device test is added to the power conversion device. The combined natural state is obtained by analyzing the frequency obtained by the combination test with the test power source and the test resistive load, obtaining the second natural frequency, and comparing the first and second natural frequencies. The stability at is determined.

  In the method for determining the stability of the combination of the power generation equipment and the power conversion device according to the present invention, the power generation equipment, the power conversion device, and the load connected to the power conversion device are combined with each other by a sudden load change test for each of the power generation equipment and the power conversion device. Since the stability after the combination can be determined before, the reliability of the plant can be improved, the construction process can be shortened and the cost can be reduced, and it is not necessary to perform a large-scale computer simulation or a large-scale simulator test.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. In the following embodiments including the first embodiment, the configuration of the power generation equipment 100 and the load device 200, the drive unit 1 such as a gas turbine, the governor 2, the generator 3, The automatic voltage regulator 4, the coupling device 5 that couples the drive machine 1 and the generator 3, the power converter 6 that is the load of the power generation equipment, the control device 7 of the power converter 6, and the load 8 of the power converter 6 are Since it is the same as that shown in FIG. 1 described above, description of the function is omitted.

  If the natural frequency of the power conversion device 6 provided in the load facility 200 does not overlap with the natural frequency of the power generation device 100, resonance between the natural frequencies does not occur. Generally, it is safe if the natural frequency is 15% or more away from the rated rotational speed of the drive unit 1. The first embodiment is a method for determining the stability before combination by obtaining the natural frequency of the device from the unit test result and confirming that it is 15% or more away from the rated speed of the drive machine. .

  First, a method for obtaining the natural frequency by a unit test on the power generation equipment 100 side will be described. FIG. 2 is a unit test configuration diagram of the power generation facility 100. In the figure, a load switch 9, a resistance load 10, and a waveform recording device 11 are provided as test equipment. In the configuration of FIG. 2, when the switch 9 provided between the generator 3 and the resistive load 10 is turned on and off, a signal indicating the behavior of the drive 1 and the generator 3, for example, shaft torque Is recorded in the waveform recording device 11. Since a sudden step change of the load 10 gives an infinite order load fluctuation to the apparatus, the natural frequency is obtained by performing FFT analysis on the measured signal and displaying the time series change.

  FIG. 3 and FIG. 4 show the results of conducting the test and analyzing the recorded signal. FIG. 3 shows, for example, a shaft torque recorded as a signal representing the behavior of the drive machine 1, FFT analysis of the shaft torque, and a time series change (water flow). The power generation facility 100 can suppress resonance up to about 10 Hz by a control system (not shown). Therefore, for stability determination, attention should be paid to the natural frequency of 10 Hz or more. The natural frequency is a frequency having a peak when the load suddenly changes. The part A shows the characteristic of the control response of the power generation equipment 100, and can be suppressed by the control system up to this frequency. Since the B and C parts have a peak at the time of sudden load change and are far from the control response, it can be seen that in this example, the natural frequency of the driving machine 1 exists in 12 to 23 Hz (B and C parts).

FIG. 4 shows, for example, the field current of the generator 3 recorded as a signal representing the behavior of the power generation facility 100, and FFT analysis of this to display time-series changes. It can be seen from FIG. 4 that the natural frequency of the power generation facility 100 exists between 12 and 23 Hz (A portion).
3 and 4 shown above, it can be seen that the natural frequency of the power generation facility 100 exists between 12 and 23 Hz.

Next, a method for obtaining the natural frequency of the power converter 6 provided in the load facility 200 by a unit test will be described with reference to the drawings, taking as an example the case where the power converter 6 is an uninterruptible power supply. FIG. 5 is a unit test configuration diagram of the uninterruptible power supply 6A. The uninterruptible power supply 6A is configured by a converter 6a that converts alternating current into direct current power, a storage battery 6b, and an inverter 6c that converts direct current power into alternating current power. The test power supply 12 of the uninterruptible power supply 6 </ b> A can vary the voltage of the test power supply 12 by the voltage setting device 13.
In the configuration of FIG. 5, the resistance load 10 is turned on and off, and a signal, such as a DC voltage, that expresses the behavior of the converter 6 a directly connected to the test power supply 12 side is recorded in the waveform recording device 11. By performing FFT analysis on this signal and displaying time-series changes, the natural frequency related to the power converter, in this case, the uninterruptible power supply 6A, can be obtained.

FIG. 6 shows, for example, a DC voltage recorded as a signal representing the behavior of the uninterruptible power supply 6 </ b> A, which is subjected to FFT analysis, and a time series change is displayed. It can be seen from FIG. 6 that the natural frequency of the converter 6a of the uninterruptible power supply 6A exists between 32 to 48 Hz (A portion) and 60 Hz (B portion).
From the FFT analysis results of the test data in the configuration shown in FIG. 2 and FIG. 5, it has been confirmed that the natural frequency of the power generation facility 100 and the natural frequency of the converter 6a of the uninterruptible power supply 6A do not overlap. It can be confirmed that the system combining these is stable.

  Next, an example in which the natural frequency of the power generation facility 100 and the natural frequency of the converter 6a of the uninterruptible power supply 200 are overlapped is shown. FIG. 7 shows another uninterruptible power supply 6A configured as shown in FIG. 5 and performs a sudden load change test by turning on and off the switch 9, records DC voltage, performs FFT analysis, and changes in time series. Is displayed. It can be seen from FIG. 7 that the natural frequency of the converter 6a of the uninterruptible power supply 6A exists between 10 to 36 Hz (A portion) and 36 to 60 Hz (B portion). Since the natural frequency of the power generation facility 100 exists in 12 to 23 Hz, the natural frequency of the power generation facility 100 and the natural frequency of the converter 6a of the uninterruptible power supply 200 are overlapped from 12 to 23 Hz. The system is likely to be unstable.

FIG. 8 summarizes the determination flow of the first embodiment. In STEP 1, a sudden load change test is performed on the power generation facility 100, and in STEP 2, a signal that shows a behavior, for example, FFT analysis of shaft torque and field current is performed, and in STEP 3, the natural frequency of the power generation facility 100 is read. . In STEP 4, a sudden load change test is performed on the uninterruptible power supply 6 </ b> A, and in STEP 5, a signal that exhibits a behavior, for example, DC voltage FFT analysis is performed. In STEP 6, the characteristics of the converter 6 a of the uninterruptible power supply 6 </ b> A Read the frequency. In STEP 7, if the natural frequency of the power generation facility 100 and the converter 6a of the uninterruptible power supply 6A is 15% or more away from the rated motor speed, it is determined to be stable.
As described above, in the first embodiment, the stability after the combination is determined in advance by the rapid load change test of the power generation facility 100 and the load facility 200 without performing the mathematical modeling, the large-scale computer simulation, and the large-scale simulator test. Gender can be determined.

Embodiment 2. FIG.
Next, a second embodiment will be described.
In the second embodiment, the natural frequency is obtained from the input voltage fluctuation test of the power converter, in this case, the uninterruptible power supply 6A. In the combination system shown in FIG. 1, the AC input current (generator output current) of the power converter 6 changes due to the output voltage fluctuation of the generator 3. Therefore, in order to obtain the natural frequency of the power converter 6, a test that varies the input voltage is a more practical operation.
FIG. 9 is a diagram summarizing the determination flow of the second embodiment. STEP 1 to STEP 3 are the same as in the first embodiment. In STEP 4-1, the voltage of the test power supply 12 is varied by the voltage setting device 13, and the input voltage fluctuation test of the uninterruptible power supply 6 </ b> A is performed. In STEP5, an FFT analysis of a signal exhibiting behavior, for example, a DC voltage is performed, and in STEP6, the natural frequency of the converter 6a of the uninterruptible power supply 6A is read. In STEP 7, if the natural frequency of the power generation facility 100 and the converter 6a of the uninterruptible power supply 6A is 15% or more away from the rated motor speed, it is determined to be stable.
As described above, the second embodiment is a more practical operation in which the load change test of the power generation facility and the input voltage are fluctuated without carrying out the mathematical modeling, the large-scale computer simulation, and the large-scale simulator test. The stability after combination can be determined in advance from the natural frequency obtained by the input voltage fluctuation test of the load facility.

Embodiment 3 FIG.
Next, a third embodiment will be described. In the third embodiment, as shown in FIG. 10, a power source impedance 14 made of a reactor, a resistor, or a combination thereof is provided between the uninterruptible power supply 6 </ b> A that is the power conversion device 6 and the test power source 12, and is opened and closed. A sudden load change test is performed by turning on and off the device 9, and the behavior of the uninterruptible power supply 6A with respect to the voltage drop of the power source impedance 14 is observed. Thus, the specific frequency of the uninterruptible power supply 6A can be obtained by a practical operation in which the input voltage is changed without requiring any special equipment for changing the power supply.
FIG. 11 is a diagram summarizing the discrimination flow of the third embodiment. STEP 1 to STEP 3 are the same as in the first embodiment. In STEP4-2, a power supply impedance 14 is provided, a sudden load change test is performed on the uninterruptible power supply 6A, a signal that exhibits behavior, for example, a DC voltage FFT analysis is performed in STEP5, and an uninterruptible power supply is detected in STEP6. The natural frequency of converter 6a of power supply device 6A is read. In STEP 7, if the natural frequency of the power generation facility 100 and the converter 6a of the uninterruptible power supply 6A is 15% or more away from the rated motor speed, it is determined to be stable.
As described above, the third embodiment can be obtained by the rapid load change test of the power generation facility and the load sudden change test provided with the power supply impedance of the load facility without carrying out mathematical modeling, large-scale computer simulation, and large-scale simulator test. In addition to being able to determine the stability after combination from the natural frequency in advance, the natural frequency can be determined by the actual operation of changing the input voltage without using special equipment that suddenly changes the power supply voltage. There is an effect that it is required.

Embodiment 4 FIG.
Next, a fourth embodiment will be described. In the fourth embodiment, a reactor 24 that simulates the transient reactance of the generator 3 is provided between the uninterruptible power supply 6A and the test power supply 12 as shown in FIG. Perform a test to determine the natural frequency. In the actual combination system shown in FIG. 1, when the load 8 of the power converter 6 suddenly changes, the AC input current (generator output current) of the power converter 6 changes and is output by the transient reactance of the generator 3. The voltage fluctuates. Furthermore, the AC input current of the power converter 6 changes with respect to the fluctuation of the output voltage. Accordingly, as shown in FIG. 12, a reactor 24 simulating the transient reactance of the generator 3 is provided, a load sudden change test is performed by turning on and off the switch 9, and there is nothing corresponding to the power conversion device 6 with respect to the voltage drop by the reactor 24. By observing the behavior of the power failure power supply device 6A, the natural frequency can be obtained in detail and with high accuracy by the same operation as that at the time of combination.
FIG. 13 is a diagram summarizing the discrimination flow of the fourth embodiment. STEP 1 to STEP 3 are the same as those in the third embodiment. At STEP 4-3, a reactor 24 for simulating transient reactance is provided, and a sudden load change test is performed on the uninterruptible power supply 6A. Then, the natural frequency of the converter 6a of the uninterruptible power supply 6A is read. In STEP 7, if the natural frequency of the power generation facility 100 and the converter 6a of the uninterruptible power supply 6A is 15% or more away from the rated motor speed, it is determined to be stable.
As described above, in the fourth embodiment, the load provided with the reactor for sudden change in the load of the power generation facility and the transient reactance simulation of the load facility without performing the mathematical modeling, the large-scale computer simulation, and the large-scale simulator test. In addition to being able to determine the stability after combination in advance from the natural frequency obtained by the sudden change test, it is unique in the same operation as the combination without using special equipment that suddenly changes the power supply voltage. There is an effect that the frequency is required.

Embodiment 5 FIG.
Next, a fifth embodiment will be described. In the first to fourth embodiments described above, the shaft torque of the three signal drivers 1 selected from the unit test results of the uninterruptible power supply 6A corresponding to the power converter 6 of the power generation facility 100 and the load facility 200, the generator 3 The previous stability evaluation was performed relatively easily by subjecting each of the field current and the DC voltage of the converter 6a to FFT analysis. In the fifth embodiment, a prior stability evaluation method in the case where an FFT analyzer that can obtain a Bode diagram or the like as a graph for stability determination by multi-input FFT analysis will be described.
Embodiment 5 of the present invention will be described below with reference to the drawings. FIG. 14 is a block diagram showing the configuration of FIG. In the figure, reference numeral 51 denotes a block representing the mechanical system of the drive machine 1 and the generator 3, where the input is the generator reaction force and the output is the generator rotational angular velocity. Reference numeral 52 denotes a block representing the electrical system of the generator 3. The input is the generator rotational angular velocity and the generator output current, and the output is the generator reaction force and the generator output voltage. Reference numeral 53 denotes a block representing the power converter system, where the input is the generator output voltage and the output is the generator output current. Reference numeral 54 is a block showing a power generation facility in which the blocks 51 and 52 are combined. An input is a generator output current and an output is a generator output voltage.
In the fifth embodiment, frequency responses corresponding to blocks 53 and 54 are individually measured by a unit test, and a round-trip frequency response is obtained to determine stability.

  The frequency response of the block 54 is obtained by recording the generator output current and the generator output voltage with an FFT analyzer or the like when the resistance load 10 is turned on and off with the switch 9 in the configuration of FIG. FIG. 16 shows a frequency response example of the block 54.

When obtaining the frequency response of the block 53, the input is the input voltage (generator output voltage) of the power conversion device 6 and the output is the input current (generator output current) of the power conversion device 6. As shown in FIG. 17, it is necessary to change the voltage of the test power supply 12 suddenly and observe the input current of the power converter 6. However, in the case of the large-capacity power converter 6, it is often difficult to change the power supply voltage suddenly in terms of equipment. Therefore, in the fifth embodiment, as shown in FIG. 18, a power supply impedance 14 is provided between the uninterruptible power supply 6A corresponding to the power converter 6 and the test power supply 12, and the switch 9 is turned on and off. An abrupt load change test is performed, the change in the input current detected by the current sensor 17 with respect to the voltage drop of the power supply impedance 14 is observed, and this is input to the FFT analyzer 15 to obtain the frequency response such as a Bode diagram. Thus, the frequency response of the block 53 can be obtained without using equipment that changes the power supply voltage suddenly. FIG. 19 shows a frequency response example of the block 53.
FIG. 20 shows an example of a round transfer function of the block 53 and the block 54. As shown in FIG. 20, the stability evaluation is usually performed from the phase margin, the gain margin, etc., as in the case of performing the stability analysis by the control engineering. Can do.
As described above, even in the fifth embodiment, without performing mathematical modeling, large-scale computer simulation, and large-scale simulator test, by the load sudden change test of the power generation equipment and the load sudden change test provided with the power impedance of the load equipment, Each frequency response is measured, and the combinational stability can be easily determined in advance by a round transfer function.

  In the first to fourth embodiments, the natural frequency of the power generation facility 100 is obtained from the load sudden change test of the drive machine 1 and the generator 3, but the speed change test of the speed governor 2 command provided in the drive machine 1 is performed. Alternatively, it may be obtained from a sudden change test of a generator voltage command by the automatic voltage regulator 4 or a generator controller (not shown).

  In the first to fourth embodiments, the natural frequency of the driving machine 1 is obtained from the shaft torque, but it may be obtained from the rotational speed.

  In the first to fourth embodiments, the natural frequency of the generator 3 is obtained from the field current, but may be obtained from the generator output voltage and the generator output current.

  In the second embodiment, the natural frequency of the uninterruptible power supply 6A is obtained from an amplitude sudden change test of the input voltage of the power converter 6 (uninterruptible power supply 6A) by moving the output voltage of the generator 3. However, it may be obtained from the same input voltage phase sudden change test.

  In the first to fourth embodiments, the natural frequency of the uninterruptible power supply 6A is obtained from the DC voltage. Similarly, the input current, input active power, input reactive power, or converter output current of the uninterruptible power supply 6A ( It may be obtained from (DC current).

  In the fifth embodiment, the power supply impedance 14 is provided between the uninterruptible power supply 6A and the test power supply 12, and the load sudden change test is performed to obtain the natural frequency. Of course, the natural frequency may be obtained from the measurement in a state closer to the actual condition.

  In the fifth embodiment, the power supply impedance 14 is provided between the uninterruptible power supply 6A and the test power supply 12, and the load sudden change test is performed to obtain the natural frequency. Of course, the natural frequency may be obtained by performing an input voltage amplitude sudden change test or an input voltage phase sudden change test of the uninterruptible power supply 6A.

  In the first to fifth embodiments, in consideration of fluctuations in the natural frequency due to the load amount, the load change test of the power generation facility 100 and the load facility 200 is performed not only by opening and closing the rated load, but also by 25%, 50%, and 75%. Of course, it is possible to change the load amount and perform the test a plurality of times. This includes the verification of this characteristic because the mechanical system such as the drive machine 1 and the generator 3 has a characteristic that the natural frequency slightly changes in accordance with the load amount.

  In Embodiments 1 to 5, the natural frequency may be obtained by gradually increasing or decreasing the load when a sudden load change test of the load facility 200 is difficult or when there is a possibility of resonance. Furthermore, the present invention can be applied to the case where the natural frequency in a steady load state is obtained.

  In the first to fifth embodiments, the case where the power conversion device 6 is the uninterruptible power supply 6A has been described. However, active devices such as an air conditioner, an inverter for driving a motor, and inverter lighting, and natural frequency components Even in the case of a communication facility using a power carrier line that can generate noise and a device that generates harmonics between orders, the stability can be similarly determined in advance.

If the stability cannot be clearly determined in the first embodiment, the stability is determined in more detail in the second to fifth embodiments, and the stability cannot be clearly determined in the second embodiment. In the case where the stability is determined in detail in the third to fifth embodiments, and in the case where the stability cannot be clearly determined in the third embodiment, the details are described in the fourth to fifth embodiments. In the case where the stability is determined and the stability cannot be clearly determined in the fourth embodiment, the stability can be determined in more detail in the fifth embodiment.
In the first to fifth embodiments, an example in which the waveform recording device and the FFT analyzer are provided in the converter has been described. However, the converter may be provided in the inverter.

  As described above, the first to fifth embodiments of the present invention can be applied to the preliminary verification of the combined stability of the power plant generator, its driver and the load connected to the generator.

It is a block diagram which shows Embodiment 1 thru | or 5 of this invention. It is a block diagram which shows Embodiment 1 thru | or 5 of this invention. This is FFT analysis data used in the first to fourth embodiments of the present invention. This is FFT analysis data used in the first to fourth embodiments of the present invention. It is a block diagram which shows Embodiment 1 of this invention. It is FFT analysis data used in Embodiment 1 of this invention. It is FFT analysis data used in Embodiment 1 of this invention. It is a flowchart figure which shows Embodiment 1 of this invention. It is a flowchart figure which shows Embodiment 2 of this invention. It is a block diagram which shows Embodiment 3 of this invention. It is a flowchart figure which shows Embodiment 3 of this invention. It is a block diagram which shows Embodiment 4 of this invention. It is a flowchart figure which shows Embodiment 4 of this invention. It is a block diagram which shows Embodiment 5 of this invention. It is a block diagram which shows Embodiment 5 of this invention. It is a frequency response figure explaining Embodiment 5 of this invention. It is a block diagram which shows Embodiment 5 of this invention. It is a block diagram which shows Embodiment 5 of this invention. It is a frequency response figure explaining Embodiment 5 of this invention. It is a frequency response figure explaining Embodiment 5 of this invention.

Explanation of symbols

1 drive machine, 2 speed governor, 3 generator, 4 automatic voltage regulator, 6 power converter,
6A uninterruptible power supply, 9 switch, 10 resistance load for test, 12 power supply for test,
13 voltage setting device, 14 impedance, 24 reactor, 100 power generation equipment,
200 Load equipment.

Claims (11)

A method for determining the combined stability of a power generation facility and a power converter,
The power generation facility is provided with a generator and a drive for driving the generator,
Before the power generation facility, the power conversion device, and the load connected to the power conversion device are combined, the power generation facility and the power conversion device are each separately tested,
The test of the power generation facility analyzes a frequency obtained by a combination test with a resistance load for testing added to the power generation facility to obtain a first natural frequency, and the test of the power conversion device By analyzing the frequency obtained by the combination test with the test power supply and the test resistive load added to the conversion device, obtaining the second natural frequency, and comparing the first and second natural frequencies A method for determining the combined stability of a power generation facility and a power converter, wherein the stability in a combined state is determined. A method for determining the combined stability of a power generation facility and a power converter,
The power generation facility is provided with a generator and a drive for driving the generator,
Before the power generation facility, the power conversion device, and the load connected to the power conversion device are combined, the power generation facility and the power conversion device are each separately tested,
The test of the power generation facility obtains a first frequency response by being tested in combination with a test resistive load added to the power generation facility,
In the test of the power converter, a second frequency response is obtained by a combination test with a test power source and a test resistive load added to the power converter, and the first and second frequency responses are used. A method for determining the combined stability of a power generation facility and a power conversion device, wherein the stability in a combined state is determined. The test of the power generation facility is characterized by a sudden load change test of the test resistance load by turning on and off a switch provided between the generator and the test resistance load. The discrimination | determination method of combination stability of the power generation equipment and power converter device of any one of Claim 1 or Claim 2 to do. The drive unit provided in the power generation facility is provided with a speed governor, and the power generation facility test is a voltage command sudden change test of the generator or a speed change command of the speed governor command by the speed governor. The method for determining the combined stability of the power generation equipment and the power conversion device according to any one of claims 1 and 2. The test of the power converter is a rapid load change test of the test load by turning on and off a switch provided between the power converter and the test load. A method for determining the combined stability of the power generation equipment and the power conversion device according to claim 1 or 3. The test power supply added to the power converter is provided with a voltage setting device, and the test of the power converter is performed by the input voltage amplitude sudden change test by the voltage setting device controlling the test power supply or The method for determining the combined stability of the power generation equipment and the power converter according to any one of claims 1 and 2, wherein the input voltage phase sudden change test is used. The power generation equipment and power converter according to claim 1, wherein an inductance component impedance is additionally provided in the test power supply added to the power converter. Of determining the stability of combination. 8. The method for determining the combined stability of a power generation facility and a power converter according to claim 7, wherein the inductance component impedance is a reactor that simulates a transient reactance of the generator. The value of the resistance load for a test added to the said power generation equipment and a power converter device is made variable, and the test of the said power generation equipment and a power converter device is implemented in multiple times. A method for determining the combined stability of a power generation facility and a power converter. 2. The first natural frequency of the power generation facility is obtained from any one of shaft torque and rotational speed of the drive machine, or field current, output voltage, and output current of the generator. A method for determining the combined stability of the power generation facility and the power conversion device described in 1. The second natural frequency of the power converter is obtained from any one of a DC voltage, a DC current, an input current, an input active power, and an input reactive power of the power converter. Method for determining the combined stability of power generation equipment and power converters.

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