KR101296812B1 - System for examination of grid connected system and method for it - Google Patents

Abstract

The present invention relates to a grid-linked simulation driving system for detecting the performance of the grid-linked system, combining the inductor of the grid-linked system to be simulated, and applying a predetermined power consumption to the rated current in the inductor And an inductor test device for detecting a signal for at least one of the grid voltages, and a data transmission / reception with the inductor test device, and based on a signal detected from the inductor received from the inductor test device. It includes a terminal for analyzing the performance of the system.

Description

System for examination of grid connected system and method for it}

The present invention relates to a grid-linked simulation driving system and its operation method, and more particularly, to provide a system for testing the performance of a three-phase inductor used in a grid-linked inverter system and a control method thereof.

In recent years, as the demand for power surges, the expansion of the power infrastructure has emerged as a very important problem. The increase in electric power demand is due to an increase in household appliances that use electricity and an increase in electric power loads for shopping malls and factories. In the case of such a power demand, the power load used in a specific season or a specific time period is rapidly increased, causing a shortage of standby power at all times, and causing an accident such as a power failure. In order to prevent such problems, various attempts have been made, such as expanding the power infrastructure and restricting use.

One way to solve this problem is to use alternative energy such as solar power, wind power, solar heat, wave power, geothermal power, thermal power generation using methane gas, or natural clean energy. In particular, solar, wind, and solar heat are relatively simple facilities, and they are suitable for the Korean situation, so they are supporting the installation and operation nationwide.

However, in reality, it is a reality that the distributed generation facility and operation using clean energy or renewable energy is not active. This is mainly due to the problem of installation of the distributed generation facility and the difficulty of connecting the power system. That is, in order to connect a distributed generation facility having a smaller power generation capacity to a power system compared to the existing power generation facilities, a direct connection or a device such as a power converter should be used. However, alternate power generation facilities connected to the power system, or power converters for connecting them, act as harmonic loads generating harmonics like nonlinear loads, thereby causing deterioration in the overall power system.

For this reason, KEPCO and power companies that operate power infrastructure are reluctant to accept electricity produced by individuals or small businesses even when electricity is scarce. Even if electricity is supplied, only a limited amount is used to schedule power quality. Efforts are being made to maintain this level.

Therefore, studies have been continuing to increase the efficiency of a grid-connected system in which distributed power generation output such as photovoltaic power generation or wind power generation is connected to a commercial grid (a commercial grid supplied by a power company) and operated in conjunction with each other.

Inductors, which determine the efficiency of grid-connected inverters in power system applications using renewable energy sources, are an essential component in inductor systems and have a direct impact on grid-linked efficiency. Nevertheless, in the current grid-connected inverter system, it is difficult to implement an optimized inductor because of the absence of equipment capable of simulating various system operating conditions and a large capacity inverter due to the high power consumption for performing the rated operation.

An object of the present invention to solve this problem is to propose an inductor simulation driving system and a control method capable of performing a simulation operation for the performance test of a three-phase inductor used in a grid-connected inverter system.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

In order to solve the above-described problems, a system-linked simulation driving system for detecting the performance of a system-associated system according to an embodiment of the present invention may be configured by combining an inductor of a system-linked system to be simulated and An inductor test device detecting a signal related to a rated current in the inductor by applying power consumption of the inductor; And a terminal for transmitting and receiving data to and from the inductor test apparatus, and analyzing the performance of the grid-connected system to be simulated based on a signal detected from the inductor received from the inductor test apparatus.

The inductor test apparatus according to the present invention includes a power supply unit for applying electric power to drive the inductor to simulate driving; A power converter for converting the power applied through the power supply into AC power and inputting the power to the inductor; And a controller for measuring a rated current flowing through the inductor and controlling the power converter or the inductor based on a user control signal received from the terminal.

In this case, the power converter may include at least one of an AC / DC converter and a DC / AC inverter.

On the other hand, the control unit according to the present invention, the signal detection unit for detecting a rated current flowing in the inductor; An inductor current controller for controlling a rated current flowing through the inductor; And a PWM generator for converting the rated current controlled by the inductor current controller into a pulse-width modulation (PWM) waveform. Further, the controller may further include a communication unit for transmitting and receiving data with the terminal.

Alternatively, the controller may control the switching frequency or the system frequency of the power converter based on the user control signal received from the terminal.

In the inductor test apparatus according to the present invention, the output connection portion of the inductor to which the three-phase output of the inductor and the transformer are connected may be shorted to one.

The terminal according to the invention, the communication unit for transmitting and receiving data with the inductor test device; A controller which analyzes the performance of the grid-connected system to be simulated based on a signal detected by the inductor received through the communication unit from the inductor test apparatus; And a display unit for outputting a result analyzed by the controller.

In this case, the control unit of the terminal, based on the signal detected by the inductor may analyze at least one of the overlapping characteristics of the rated current, inductance and grid voltage of the inductor.

In addition, the terminal according to the present invention further comprises a user input unit for inputting a signal according to the user input to the terminal, and the part of the control signal for the inductor test device input through the user input unit via the communication unit Can be sent to the inductor test device. The control signal may include at least one of a rated current value of the inductor, an inductance value of the inductor, a switching frequency value, and a grid frequency value.

In order to solve the above problems, an inductor test apparatus for inspecting the inductor by combining an inductor of a grid-connected system to be simulated according to an embodiment of the present invention and an inspection result of the inductor test apparatus are analyzed. A method of operating a system-driven simulation driving system comprising a terminal for performing the steps of: detecting a signal related to a rated current in the inductor as a predetermined power consumption is applied in the inductor test apparatus; Transmitting a signal detected from the inductor to the terminal; And receiving a user control signal relating to the inductor test apparatus from the terminal.

The method of operating a system-driven simulation driving system according to the present invention further includes controlling the power converter or the inductor according to the received user control signal, wherein the control signal is a rated current value of the inductor. , At least one of an inductance value, a switching frequency value, and a grid frequency value of the inductor.

Another aspect of the present invention for solving the above problems An inductor test apparatus for inspecting the inductor by combining the inductor of the grid-connected system to simulate the operation according to another embodiment and the test results in the inductor test apparatus A method of operating a grid-connected simulation driving system comprising a terminal for receiving the signal, the terminal receiving a signal related to a rated current detected in the inductor according to a predetermined power consumption from the inductor test apparatus; Analyzing at least one of overlapping characteristics of rated current, inductance, and grid voltage of the inductor through a preset inductor modulation application based on the received signal; And outputting the analysis result to a predetermined region of the display unit.

At this time, the operating method of the grid-driven simulation driving system according to the present invention, at least the inductor rated current value, inductance value, switching frequency value, grid frequency value and the index value of the inductor modulation application with respect to the inductor test apparatus. Receiving a user control signal comprising one; And transmitting a part of the received user control signal to the inductor test apparatus.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention by those skilled in the art. And can be understood and understood.

According to the present invention, it is possible to perform a simulation operation for the inductor of the grid-connected system, and to check the inductor performance.

In addition, according to the present invention, by applying a small amount of power consumption to the inductor test apparatus, it is possible to measure the rated current flowing through the inductor under the same conditions as when the actual grid-connected system operates, and analyze the performance of the inductor.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a view showing an example of a system-related system associated with an embodiment of the present invention.
2 is a view showing an example of a system-linked simulation driving system according to an embodiment of the present invention.
3 is a diagram illustrating an example of a configuration of an inductor test apparatus of a grid-driven simulation driving system according to an exemplary embodiment of the present invention.
4 is a diagram illustrating an example of a configuration of a terminal of a system-driven simulation driving system according to an embodiment of the present invention.
5 is a flowchart illustrating an example of a process of transmitting and receiving data in a system-linked simulation driving system according to an exemplary embodiment of the present invention.
6 is a diagram illustrating an example of an inductor test detection result in a system-linked simulation driving system according to an exemplary embodiment of the present invention.
7 is a view showing another example of the inductor test detection result in the grid-driven simulation driving system according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms, and the terms are used only for the purpose of distinguishing one component from another Is used.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

The present invention relates to an inductor simulation driving system and a control method thereof, and more particularly, to provide a system for testing the performance of a three-phase inductor used in a grid-connected inverter system and a control method thereof.

1 is a view showing an example of a grid-linked inverter system according to an embodiment of the present invention, Figure 1 (a) shows an example of a solar power inverter system, Figure 1 (b) is An example of an inverter system for wind power generation is shown.

Referring to FIG. 1A, the inverter system 110 for solar power generation may link DC power 111 generated from sunlight to a system through a DC / AC inverter 112 that is a power converter. It is a structure to convert to three phase AC power. Three-phase AC power is connected to the grid 114 through the three-phase inductor 113, the voltage across the three-phase inductor 113 is a pulse corresponding to the switching frequency (fs) performed in the DC / AC inverter 112 Pulse-Width Modulation (PWM) waveforms are input.

Referring to FIG. 1B, the inverter system 120 for wind power generation converts an AC / DC converter 122 for converting an AC power source 121 generated from wind power into a DC power source and a DC power source again to an AC power source. The three-phase AC power source is connected to the system through the three-phase inductor 124 via the DC / AC inverter 123. Even in this case, the voltage applied to the three-phase inductor 124 is input a PWM waveform corresponding to the switching frequency (fs) performed in the DC / AC inverter 123, the three-phase inductor 124 is essential for system operation As a factor, it determines the efficiency of the system.

As described above, the performance of the three-phase inductor closely related to the efficiency of the grid-connected inverter system will be tested, and the inductor simulation driving system capable of simulating the three-phase inductor to control the three-phase inductor current and the like will be described.

2 is a view showing an example of a system-linked simulation driving system according to an embodiment of the present invention.

2, the inductor simulation driving system 200 is a waveform of the three-phase current measured in the inductor test device 210 and the inductor test device for operating as a virtual power generation system by connecting the inductor of the power generation system to be tested And a terminal 220 for receiving and analyzing data.

The terminal 220 shown in FIG. 2 transmits and receives data of the inductor test apparatus and activates an inductor modulation application (Man Monitering Interface (MMI)) for controlling the inductor test apparatus, and includes a personal computer and a notebook computer ( laptop computers, tablets, and the like. The inductor test apparatus 210 and the terminal 220 may transmit and receive data through an internet communication network (for example, RS-232 and 485 communication networks).

The inductor test apparatus 210 shown in FIG. 2 may be configured similarly to the configuration of a general grid-connected system. For example, when the three-phase inductor under test is coupled in the device, a small amount of power (DC power or AC power) corresponding to the renewable energy source is applied to allow the rated current to flow through the inverter to the three-phase inductor. It simulates and can detect the three-phase current and three-phase voltage in a three-phase inductor.

When data about the three-phase current and the three-phase voltage detected by the inductor test apparatus 210 is transmitted to the terminal 220, the terminal 220 controls the rated current value of the inductor, the switching frequency fs, etc. through the MMI. The signal is transmitted to the inductor test device 210. In addition, the terminal 220 may perform a function of analyzing an inductance of the inductor or an overlapping characteristic of a DC power source by analyzing a current waveform measured in an actual inductor.

As described above, each configuration of the inductor simulation driving system according to the present invention will be described in detail with reference to FIG. 3.

3 is a diagram illustrating an example of a configuration of an inductor test apparatus of a grid-driven simulation driving system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, an inductor test apparatus 300 according to the present invention includes a power supply unit 310 for applying three-phase AC power to a test device, a power converter 320 for converting applied power, and three to be tested. The phase inductor 330 includes a control unit 340 for controlling the power converter and an output connection unit 350 for connecting the converted power to the power system. The components shown in FIG. 3 are not essential and can be a device having more or fewer components.

Meanwhile, the terminal 360 illustrated in FIG. 3 is the same as the terminal 220 described above with reference to FIG. 2, and the current or voltage waveform of the inductor 330 is obtained by using the MMI activated by the user 360. And to transmit the control signal to the inductor test apparatus 300.

Referring back to FIG. 3, the power converter 320 may include an AC / DC converter 321 and a DC / AC inverter 322 as shown in FIG. 3 according to a power generation form of renewable energy corresponding to the power supply unit 310. It may include or may consist of only a DC / AC inverter. Preferably, the power converter 320 generates AC power in the same load condition (eg, grid, motor, etc.) as the system for grid-driven power generation to be tested.

The controller 340 controls the AC / DC converter 321 and / or the DC / AC inverter 322. In detail, the controller 340 may include a signal detector 341 for detecting a signal from the three-phase inductor 330, an input power factor 342 for controlling the AC / DC converter input power factor, and a current of the three-phase inductor 330. An inductor current control unit 343 for controlling the, may include a PWM generator 344 for generating a control signal for the current, such as a PWM waveform, and a communication unit 345 for transmitting and receiving data with the terminal 360.

The signal detector 341 detects a three-phase current or three-phase system voltage in the three-phase inductor 330, and a signal regarding the detected current or voltage is transmitted to the terminal 360 through the communication unit 345.

The inductor current controller 343 controls the inductor 330 according to a control signal received from the terminal 360 in which the MMI application is activated through the communication unit 345. For example, the user control signal transmitted from the terminal 360 may be a rated current value or inductance value of the inductor 330 to be operated in the power generation system, a switching frequency value or a grid frequency value of the power converter 320. And the like, and may further include analysis data of waveforms of the three-phase inductor 330 measured according to the operation of the inductor test apparatus 300.

In addition, the inductor test apparatus 300 according to the present invention generally configures the output connection unit 350 to which the three-phase inductor and the transformer are connected in a grid-connected system so that the three-phase inductor output unit is shortened to one. By connecting three phases into one, three-phase inductor current control allows the inductor test device to operate at the desired current value.

As shown in FIG. 3, when the output connection unit 350 is short, the output voltage of the inductor becomes zero and the power consumption of the test apparatus approaches zero. Accordingly, while applying the rated current, it is possible to obtain data on the characteristics of the test inductor 330 during operation, and at the same time, the amount of power consumed by the actual test apparatus 300 may be minimized.

4 is a diagram illustrating an example of a configuration of a terminal of a system-driven simulation driving system according to an embodiment of the present invention.

Referring to FIG. 4, the terminal 400 belonging to the system-driven simulation driving system according to the present invention controls the wired / wireless communication unit 410, a user input unit 420 for inputting a signal according to a user input, and overall operation of the terminal. The control unit 430 includes a display unit 440 and a memory 450 for outputting a result according to a terminal operation. Since the components shown in FIG. 4 are not essential, a terminal having more or fewer components may be implemented.

The controller 430 controls the overall operation of the terminal 400. For example, an application (eg, an MMI program) related to a predetermined inductor modulation for analyzing a result of a grid-driven simulation driving system and inputting a control signal is set. The grid-connected simulation driving system module 431 may further include.

The grid-connected simulation driving system module 431 transmits / receives data with the inductor test device 460 and analyzes the inductor three-phase rated current or three-phase grid voltage based on the detection signal received from the inductor test device 460. can do. In addition, it is possible to analyze the inductance of the inductor or the superposition characteristic of the system voltage flowing through the inductor. The grid-connected simulation driving system module 431 may monitor the simulation driving result of the inductor to be tested and output the analysis result to a predetermined region of the display unit 440.

In addition, a user may control a control signal for at least one of a rated current value of an inductor to be operated in a power generation system, an inductance value required for inverter control, a switching frequency value of a power converter, a grid frequency value, and an index value of an inductor modulation application. It may be input to the terminal 400 through the input unit 420. Accordingly, the system-linked simulation driving system module 431 may transmit a part of the user control signal input through the user input unit 420 to the inductor test apparatus 460 through the communication unit 410. Memory 450 Based on the signal transmitted from the inductor test device 460 stores the information on the rated current and grid voltage of the inductor, the power consumption, switching frequency, etc. applied to the inductor test device 460. Alternatively, information about the control signal input by the user may also be stored.

5 is a flowchart illustrating an example of a process of transmitting and receiving data in a system-linked simulation driving system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, an inductor of the system under test is coupled to the inductor test apparatus 300 described above with reference to FIG. 3 to apply a predetermined amount of power consumption corresponding to the rated power of the system under test (S400). ). For example, the inductor test apparatus 300 according to the present invention may perform the simulation operation by applying the power consumption 626W corresponding to the rated current 9.1KW.

Inductor test apparatus 300 is a three-phase current in the three-phase inductor 330 that is applied to the three-phase inductor 330 is applied power is converted through the power converter 320, and the input AC power and And / or detect a signal related to the three-phase voltage (S510).

The signal for the three-phase current and / or three-phase voltage detected from the inductor is transmitted to the terminal 400 shown in FIG. 4 through a communication network (S520).

The terminal 400 operates the inductor 330 based on a signal for the detected three-phase current or three-phase voltage in the inductor received from the inductor test apparatus 300 using the grid-connected simulation driving system module 431. The analysis on the characteristic (actual waveform) is performed (S530). In this case, the terminal 400 may analyze an inductance or an AC power overlap characteristic of the inductor 330 during the analysis process.

Accordingly, the terminal 400 configures a UI related to the performance of the inductor 330 or a UI related to the waveform of current or radio waves analyzed by the inductor 330 according to the analysis result and outputs the UI to the display unit 440 (S540). ). An example of this is illustrated in FIGS. 6 and 7 to be described later.

Then, the user based on the UI related to the inductor performance output on the display unit 440 of the terminal 400, the rated current value of the inductor to be operated through the user input unit 420, the inductance value required to control the inverter, A control signal for at least one of a switching frequency value, a grid frequency value, and an index value of an inductor modulation application of the power converter is input (S550).

Accordingly, the terminal 400 performs at least one of the input user control signals (eg, at least one of a rated current value of the inductor, an inductance value required for inverter control, a switching frequency value of the power converter, and a grid frequency value). The device 300 transmits through the communication network (S560).

Next, the inductor test apparatus 300 controls the AC / DC converter 231 or the DC / AC inverter 232 of the power converter 320 based on the user control signal received from the terminal 400, or three-phase. The inductor 330 is controlled (S570).

6 is a diagram illustrating an example of an inductor test detection result in a system-linked simulation driving system according to an exemplary embodiment of the present invention.

In detail, FIG. 6 illustrates an example of analyzing and monitoring inductor performance in a terminal that receives a detection result signal for an inductor of an inductor test apparatus.

According to the present invention, like the inductor test apparatus 300 shown in FIG. 3, the output connection 340 to which the inductor and the grid are connected is shortened to one, thereby minimizing the amount of power lost and simulating operation by applying a small amount of power. You can test the inductor performance at the current value you want.

That is, as shown in FIG. 6, in the grid-linked system to be tested, the rated power consumption 626W corresponding to 9.1KW is applied to the inductor test apparatus to measure the current and the grid voltage flowing in the inductor when 9.1KW is applied. .

7 is a view showing another example of the inductor test detection result in the grid-driven simulation driving system according to an embodiment of the present invention.

The terminal receives a signal detected by the inductor when the rated power consumption 626W is applied in the inductor test apparatus, and the current waveform 701 and the grid voltage waveform 702 flowing in the inductor as shown in FIG. 7 based on the received signal. ) Can be analyzed and output on the display. The current and grid voltage values of the inductor shown in FIG. 7 are the degree of flow through the inductor when 9.1 KW of power is actually applied to the system for generating grid-linked power, and the user applies a small amount of power consumption to the inductor when the rated current flows. Characterize during operation.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments described in the present invention are not intended to limit the technical idea of the present invention but to explain, and the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

Claims (20)

In the grid linked simulation driving system for detecting the performance of the grid linked system,
An inductor testing device for coupling a inductor of a grid-connected system to be simulated and applying a predetermined power consumption to detect a signal relating to a rated current in the inductor; And
And a terminal for transmitting and receiving data to and from the inductor test apparatus and analyzing the performance of the grid-connected system to be simulated based on a signal detected from the inductor received from the inductor test apparatus.
The inductor test device,
A power converter for converting the applied power into AC power to drive the inductor to simulate driving the inductor; And
And a control unit for measuring the rated current flowing through the inductor and controlling the power converter or the inductor based on a user control signal received from the terminal. delete The method of claim 1,
The power converter includes at least one of an AC / DC converter and a DC / AC inverter, grid-driven simulation driving system. The method of claim 1,
The control unit,
A signal detector for detecting a rated current flowing through the inductor;
An inductor current controller for controlling a rated current flowing through the inductor; And
And a PWM generation unit for converting the rated current controlled by the inductor current controller into a pulse-width modulation (PWM) waveform. 5. The method of claim 4,
The control unit,
Further comprising a communication unit for transmitting and receiving data with the terminal, system-driven simulation driving system. The method of claim 1,
The control unit,
A system-linked simulation driving system for controlling the switching frequency or grid frequency of the power conversion unit based on the user control signal received from the terminal. The method of claim 1,
The inductor test device,
And short-circuit the output connection of the inductor to which the three-phase output of the inductor and the transformer are connected. The method of claim 1,
The terminal,
Communication unit for transmitting and receiving data with the inductor test device;
A controller which analyzes the performance of the grid-connected system to be simulated based on a signal detected by the inductor received through the communication unit from the inductor test apparatus; And
A system-linked simulation driving system including a display unit for outputting the results analyzed by the control unit. 9. The method of claim 8,
The control unit,
And analyzing at least one of the overlapping characteristics of the rated current, inductance, and grid voltage of the inductor based on the signal detected by the inductor. 9. The method of claim 8,
Further comprising a user input unit for inputting a signal according to a user input to the terminal,
And a part of a control signal relating to the inductor test apparatus input through the user input unit to the inductor test apparatus through the communication unit. The method of claim 10,
Wherein the control signal comprises:
And at least one of a rated current value of the inductor, an inductance value of the inductor, a switching frequency value, and a grid frequency value. In the method of operating a grid-connected simulation driving system comprising an inductor test device for inspecting the inductor by coupling the inductor of the grid-linked system to be simulated and a terminal for analyzing the test results in the inductor test device ,
Detecting a signal relating to a rated current in the inductor as a predetermined power consumption is applied in the inductor test apparatus;
Transmitting a signal detected from the inductor to the terminal; And
And receiving a user control signal relating to the inductor test device from the terminal. The method of claim 12,
Controlling a predetermined power converter or the inductor included in the inductor test apparatus according to the received user control signal;
Wherein the control signal comprises:
And at least one of a rated current value of the inductor, an inductance value of the inductor, a switching frequency value, and a grid frequency value. In the method of operating a grid-connected simulation driving system comprising an inductor test device for inspecting the inductor by coupling the inductor of the grid-linked system to be simulated and a terminal for analyzing the test results in the inductor test device ,
Receiving, by the terminal, a signal regarding a rated current detected in the inductor according to application of a predetermined power consumption from the inductor test apparatus;
Analyzing at least one of overlapping characteristics of rated current, inductance, and grid voltage of the inductor through a preset inductor modulation application based on the received signal; And
And outputting the analysis result to a predetermined area of the display unit. 15. The method of claim 14,
Receiving a user control signal with respect to the inductor testing device including at least one of a rated current value, an inductance value, a switching frequency value, a grid frequency value, and an index value of the inductor modulation application; And
And transmitting a portion of the received user control signal to the inductor test device. In the test apparatus for detecting the performance of the grid-connected system by coupling the inductor of the grid-connected system to be simulated,
A power converter for converting the applied power into AC power to drive the inductor to simulate driving the inductor;
A control unit for generating a detection signal by measuring a rated current flowing through the inductor, and controlling the power converter or the inductor based on a user control signal received from a predetermined terminal; And
Including the communication unit for transmitting a detection signal for the inductor to the user terminal, inductor testing apparatus. 17. The method of claim 16,
The power converter includes at least one of an AC / DC converter and a DC / AC inverter. 17. The method of claim 16,
The control unit,
A signal detector for detecting a rated current flowing through the inductor;
An inductor current controller for controlling a rated current flowing through the inductor; And
And a PWM generator for converting a rated current controlled by the inductor current controller into a pulse-width modulation (PWM) waveform. 17. The method of claim 16,
The control unit,
And controlling a switching frequency or a grid frequency of the power converter based on a user control signal received from the terminal. 17. The method of claim 16,
The inductor test device,
Inductor test apparatus, characterized in that for shorting the output connection of the inductor to the three-phase output of the inductor and the transformer to one short (short).

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