KR100428256B1 - A Device Of Disturbance Power Supply - Google Patents

Abstract

The present invention relates to a servo motor for changing a voltage by a single winding transformer; A servo motor control unit controlling an operation of the servo motor; A frequency converter for varying the commercial frequency of the power supplied to the commercial power; A power unit configured of the single winding transformer, the servo motor, the servo motor controller, and the frequency converter, generating a disturbance by supplying voltage to the load by controlling voltage and frequency; An operation unit to which a selector switch for selecting static test or dynamic test is installed for disturbance supply and load characteristics test; A display unit provided with a digital measuring device for displaying in real time the voltage, current, and frequency according to an operation situation when supplying disturbance to the load machine; Characterized by the disturbance supplied The measurement unit for measuring the voltage and current, the reactive power, the reactive power, the frequency, the power factor of the load device to obtain the data; and a disturbance supply power supply comprising a. In addition, disturbance is generated by the servo motor, the servo motor controller, and the frequency converter. The power supply unit may further include a voltage controller configured to control the static and dynamic characteristics of the voltage by combining the single winding transformer, the servo motor, and the servo motor controller.

Description

A Device Of Disturbance Power Supply

The present invention relates to a disturbance supply power supply that can generate and supply disturbances generated in a power system to a load device, and more specifically, supply a disturbance generated in a power system to a load system similarly to a real system. In addition, the load device can measure the effective / reactive power which is a response characteristic, and the disturbance supply power supply that can lead to the improvement of power quality due to the load due to disturbance, as well as the life and efficiency of the load device will be.

In the power transmission and distribution system, the power quality is lowered due to various disturbances caused by internal and external causes, which causes the malfunction of important facilities, operation stop, and loss of information. Therefore, this causes a huge economic loss, the disturbance of this system is reported to significantly reduce the life of the load device as well as the efficiency of the electric machine.

In order to quantitatively analyze the effects of disturbance, it is necessary to acquire data on the response characteristics of the load equipment. However, the response characteristics of the load equipment should be measured and analyzed when the disturbance occurs in the real system. However, since the occurrence time of the disturbance in the real system is very diverse, irregular and uncertain, direct measurement in the real system is impossible.

However, only indirect measurement, which supplies disturbances similar to the actual system in laboratories and measures and analyzes the response characteristics of the load, is useful. This requires a device capable of supplying disturbances similar to the actual system for loads.

Until now, one method to obtain the characteristic data of the load equipment by simulating the disturbance of the actual system is to artificially create a voltage and frequency similar to the disturbance that may occur in the system using a synchronous generator, etc., and then measure and analyze the characteristic data. come.

However, in reality, since the voltage change of the power system is made in a very short time, it is impossible to simulate the disturbance of the actual system by the synchronous generator, etc., and the operating time of the reclosing relay in the case of system failure also operates within several cycles. Synchronous generators that have been used in the past research do not meet these requirements.

In addition, current research and development and commercialization of voltage and frequency variable devices are used in product development and quality control of export products due to the difference in voltage used in the world. However, it is possible to supply constant voltage and frequency by adopting only power electronic switching elements, but it is impossible to supply disturbances generated from the system. Characterization is impossible.

Therefore, in order to understand the characteristics of the load equipment, it is urgently necessary to develop an integrated disturbance supply power supply device capable of supplying power similar to the disturbance generated in the system, as well as supplying proper power during the development and quality control of export products.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and the first object of the present invention is to supply a power supply similar to the disturbance occurring in the power system, thereby enabling effective / invalid performance, which is a response characteristic of the load. It is to provide a disturbance supply power supply that can measure the power, quantitatively analyze the characteristics of the load caused by the disturbance, and provide basic data applicable to the load model and system analysis.

In addition, the second object of the present invention is to provide a disturbance supply power supply that can supply a high-quality voltage and frequency appropriately in the development and quality control of electrical goods for export products in the foreign countries with different operating voltages.

The object of the present invention, the servo motor for changing the voltage by a single winding transformer;

A servo motor control unit controlling an operation of the servo motor;

A frequency converter for varying the commercial frequency of the power supplied to the commercial power;

A power unit configured of the single winding transformer, the servo motor, the servo motor controller, and the frequency converter, generating a disturbance by supplying voltage to the load by controlling voltage and frequency;

An operation unit to which a selector switch for selecting static test or dynamic test is installed for disturbance supply and load characteristics test;

A display unit provided with a digital measuring device for displaying in real time the voltage, current, and frequency according to an operation situation when supplying disturbance to the load machine;

Characterized by the disturbance supplied by the disturbance supply power supply characterized in that it comprises a; measuring unit for measuring the voltage and current, active and reactive power, frequency, power factor of the load device to be tested to obtain data.

In addition, disturbance is generated by the servo motor, the servo motor controller, and the frequency converter.

The power supply unit may further include a voltage controller configured to control the static characteristics of the voltage and the occurrence of disturbances to the dynamic characteristics by combining the single winding transformer, the servo motor, and the servo motor controller.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

1 is a block diagram showing a disturbance supply power supply apparatus according to the present invention,

Figure 2a is a graph showing the static characteristic state of the voltage change in the disturbance power supply device according to the present invention,

Figure 2b is a graph showing the state of dynamic characteristics of the voltage change in the disturbance power supply device according to the present invention,

3 is an exemplary view showing a control circuit of the voltage control device according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: commercial power 100: power supply

110: single winding transformer 120: servo motor

130: frequency converter 140: servo motor controller

200: operation unit 300: display unit

400: measuring unit 500: voltage control device

510: first switch 520: second switch

900: disturbance supply power supply device 999: load target device

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram showing a disturbance supply power supply apparatus according to the present invention.

As illustrated in FIG. 1, the disturbance supply power supply device 900 may simulate various disturbances generated in the power system to measure and grasp the static characteristics and dynamic characteristics of the load similar to the real system.

The disturbance supply power supply device 900 is composed of a power supply unit 100, the operation unit 200, the display unit 300, the measuring unit 400.

The power supply unit 100 is a voltage control device capable of controlling the occurrence of disturbances to the static characteristics and dynamic characteristics of the voltage by combining the single winding transformer 110, the servo motor 120 and the servo motor control unit 140; The frequency converter 130 was configured for the purpose of varying the frequency. Then, the voltage and frequency can be automatically or manually controlled to suit the user's purpose of use.

Here, the single winding transformer 110 and the servo motor 120 are connected using a coupler, electrically insulated from the disturbance supply device 900, and the frequency converter 130 also includes an enclosure of the disturbance supply device 900. And electrically isolated.

The operation unit 200 is provided with a selector switch for static test and dynamic test so as to facilitate the supply of a constant power during the development and quality control of the export product, as well as the characteristic test of the load device 999 to be tested. . In the case of static experiments, automatic / manual selection switches were installed to allow automatic or manual experiments, and dynamic experiments can supply rapid disturbances as set by the start / stop switch.

Here, the configuration of the operation unit 200 is composed of a variety of switches so that the static test, dynamic test, the characteristic test of the test target load device 999 can be operated in accordance with the needs of the user automatically or manually. It is also possible to adjust the voltage and frequency, the degree of disturbance change, that is, the degree of voltage dip and the duration of disturbance.

The display unit 300 monitors the operation of the disturbance supply device 900 by installing a digital measuring instrument that can display the current voltage, current, and frequency in real time.

The measurement unit 400 adds a power converter to measure the voltage and current of the load facility, the reactive power, the reactive power, the frequency, the power factor, etc., when supplying the disturbance to the test target load device 999, The acquisition of data was made possible in real time.

When the disturbance is supplied by the power supply unit 100 of the present invention, when the voltage and frequency are varied and the frequency is used by the commercial power supply 10 and only the change of the voltage is to be applied, the selection can be selected by switching the selection switch. have.

Figure 2a is a graph showing the static characteristic state of the voltage change in the disturbance supply power supply according to the present invention, Figure 2b is a graph showing the dynamic characteristic state of the voltage change in the disturbance supply power supply according to the present invention.

As shown in FIGS. 2A and 2B, the disturbance supply power supply 900 may similarly simulate a situation in which a voltage changes with a change in frequency. That is, as shown in the graph shown in FIG. 2A, the voltage fluctuation range can be freely changed for a predetermined time in the static characteristic state. In addition, as shown in the graph shown in FIG. 2B, a sudden voltage change, that is, voltage sags, can be simulated, and time control at this time is possible.

Accordingly, the voltage control device of the power supply unit 100 may control the combination of the servo motor 120 and the single winding transformer 110 to test the static characteristics shown in FIG. 2A.

In addition, the voltage control device configures a voltage control circuit as shown in FIG. 3 to simulate dynamic characteristics as shown in FIG. 2B. In addition, the voltage control device is provided with a device for adjusting the fault duration such as 'a' and the degree of fault voltage such as 'b' in the experiment of the dynamic characteristics of FIG. 2B.

3 is an exemplary view showing a control circuit of the voltage control device according to the present invention.

As shown in FIG. 3, the degree of the fault voltage may be adjusted as shown in FIG. 2B by adjusting the voltage of the single winding transformer 110, and the switch MC # 1 may operate in a normal state. Design the circuit.

At this time, the first switch (MC # 1) 510 and the second switch (MC # 2) 520 employ an interlock circuit to suppress fluctuations in the output terminal voltage. In addition, as shown in 'a' of FIG. 2B, whether the failure time is continued may be controlled according to the excitation time of the second switch (MC # 2) 520. In the same manner, the steady state power supply time may be controlled according to the excitation time control of the first switch (MC # 1) 510.

The disturbance supply power supply 900 of the present invention can simulate various disturbances generated in the power system similarly to the actual system. In other words, the load characteristics can be simulated similarly to the disturbance that is frequently generated in transmission and distribution systems.

The disturbance supply power supply device 900 is characterized in that it is easy to static load test and dynamic test of the load by using the commercial power supply 10, and can easily supply appropriate high quality voltage and frequency required for product development and quality control. have.

As described above, according to the disturbance supply power supply device 900 according to the present invention, the disturbance generated in the power system can be supplied to the load device 999 similarly to the actual system, and the response characteristics of the load device 999 can be provided. Phosphorus effective / reactive power can be measured, leading to an improvement in power quality according to the load device 999 as well as the life and efficiency of the load device 999 in relation to disturbance.

That is, in order to quantitatively analyze the effects of the disturbance, by developing a disturbance supply power supply unit 900 capable of supplying a disturbance similar to a real system, the enormous economic loss and power loss of the load device 999 due to the deterioration of power due to various disturbances. It is possible to prevent the decrease in life, the efficiency of the electric machine, and the like.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various other modifications and variations may be made without departing from the spirit and scope of the invention. Accordingly, it is intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

Claims (3)

A servo motor 120 for changing the voltage by the single winding transformer 110; A servo motor controller 140 for controlling the operation of the servo motor 120; A frequency converter 130 for varying the commercial frequency of the power supplied to the commercial power source 10; The single winding transformer 110, the servo motor 120, the servo motor controller 140, and the frequency converter 130 are configured to generate a disturbance by controlling voltage and frequency to supply the load device 999. A power supply unit 100; An operation unit 200 to which a selection switch for selecting static test or dynamic test is installed for disturbance supply and load characteristic test; A display unit 300 having a digital measuring device for displaying in real time a voltage, a current, and a frequency according to an operation situation when a disturbance is supplied to the load device 999; Disturbance supply power supply device characterized in that it comprises a; measuring unit (400) for measuring the voltage and current, active and reactive power, frequency, power factor of the characteristic load test device (999) by the disturbance supplied to obtain data. The disturbance power supply apparatus according to claim 1, wherein disturbance is generated by the servo motor (120), the servo motor controller (140) and the frequency converter (130). According to claim 1, The power supply unit 100 controls the occurrence of disturbances to the static characteristics and dynamic characteristics of the voltage by combining the single winding transformer 110, the servo motor 120 and the servo motor controller 140 Disturbance supply power supply, characterized in that to further configure the voltage control device 500.