KR101728681B1 - A relay device and drive control method for transferring power generated in the electrical load testing equipment to grid connection - Google Patents

A relay device and drive control method for transferring power generated in the electrical load testing equipment to grid connection Download PDF

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Publication number
KR101728681B1
KR101728681B1 KR1020150162885A KR20150162885A KR101728681B1 KR 101728681 B1 KR101728681 B1 KR 101728681B1 KR 1020150162885 A KR1020150162885 A KR 1020150162885A KR 20150162885 A KR20150162885 A KR 20150162885A KR 101728681 B1 KR101728681 B1 KR 101728681B1
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South Korea
Prior art keywords
relay
power
regenerative
load testing
electric
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KR1020150162885A
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Korean (ko)
Inventor
채용웅
오현택
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계명대학교 산학협력단
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G01R23/165—Spectrum analysis; Fourier analysis using filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a relay apparatus and a drive control method for transmitting regenerative electric power of an electric load testing apparatus to a system line, and more particularly, A regenerative power generating unit for regenerating and outputting a regenerative power to a commercial power supply and a performance test testing unit for testing an electrical operation characteristic of the device under test using a power source of a load power amount output from the device under test ; A commercial power source for receiving a regenerative power of an AC power outputted from a regenerative power generating unit of the electrical load testing apparatus; And a relay unit connected between the electric load testing apparatus and the system line of the commercial power supply and controlled to be supplied with and cut off the regenerative power of the alternating current power supplied from the regenerative power generating unit of the electric load testing apparatus, It is a feature of the configuration.
According to the relay device and the drive control method for transferring the regenerative electric power of the electric load testing device proposed in the present invention to the system line, the regenerative electric power output from the electric load testing device for testing the electric operation characteristics of the device under test In configuring the relay for transmission to the system line of the power supply, the state of the system line of the commercial power supply is confirmed through the PLL, and the regenerated power of the electric load testing apparatus and the system line of the commercial power supply are synchronized through the PLL The relay can be driven so that the regenerative power can be transmitted to the system line of the commercial power supply.
In addition, according to the present invention, before the relay is driven to connect the regenerative power output from the electric load testing device to the system power line of the commercial power supply, synchronization is performed using the PLL, It is possible to prevent the electric power from being transmitted to the system line from the electric load testing device due to the inconsistency of the electric load testing device or the problem that the regenerative electric power of the electric load testing device is low,
In addition, according to the present invention, since the relay unit in which a plurality of relays are connected in parallel is solved, the problem that the internal resistance value is increased due to the aging of the relay is solved and the life extension of the relay unit through the distributed supply of the regenerative power can be improved .

Description

TECHNICAL FIELD [0001] The present invention relates to a relay device and a drive control method for transferring regenerative electric power of an electric load testing device to a system line,

The present invention relates to a relay apparatus and a drive control method, and more particularly, to a relay for transmitting regenerative power output from an electric load testing apparatus for testing an electric operation characteristic of a device under test to a system line of a commercial power supply In order to prevent the problem that electric power is not transmitted from the electric load testing device to the grid line due to the mismatch of the phase and frequency of the voltage or the problem that the regenerative power of the electric load testing device is low, To a relay device and a drive control method for transferring regenerative electric power of an electric load testing device for synchronizing a regenerative electric power of a load testing device and a grid line of a commercial power source and then driving a relay to transfer regenerative electric power to a grid line .

Generally developed electric power equipment or manufactured power supply equipment shall be tested for electrical operation characteristics before sale or to confirm the performance and reliability of the characteristics of the power supply equipment that is operating normally. In other words, it is possible to test a power supply device such as a transformer, a rectifier, a voltage regulator, an inverter, and a battery that converts power by using a commercial power source inputted, or a power generator, a wind power generator, a solar power generator, The electric load test apparatus is used for the performance test of the battery and the discharge characteristic test of the battery charged with electric energy.

1 is a diagram showing a configuration of a conventional electric load testing apparatus. 1, a conventional electric load testing apparatus 20 includes a performance test testing unit 21 for testing an electric operation characteristic of the device under test 10 with a power source output from the device under test 10 ) And a manual type electric resistance body 21 are connected in multiple. In the electric resistance body 21 used in this test, the electrical operation characteristics of the device under test 10 are measured while discharging all the electric energy supplied from the device under test 10 through heat and consuming heat, During the test of the device under test 10, heat is generated by the amount of electric energy continuously tested and consumed as heat. That is, the conventional electric load testing apparatus 20 including a large number of electric resistors 21 having a large amount of heat can adjust the amount of test electric power by adjusting the electric heating elements according to the voltage and current (electric power) The electrical characteristics of the DUT 10 are measured and the operation state is simulated to determine whether the DUT 10 is suitable for safety and reliability.

The conventional electric load testing apparatus 20 is provided with a ventilating circulation device 23 and a cooling device 23 for lowering the heat radiated by the test as the electric energy to be tested is consumed through the electric resistor 21 during the test time, There is a problem in that the electric energy is consumed. In addition, since the amount of electric power supplied to the test must be increased, the cost of equipment investment is increased along with electricity consumption, and the heat capacity and configuration of the electric resistor (21) must be changed according to the condition and accuracy of the device under test, Which is excessively large, bulky and heavy in weight, can not be precisely controlled, can only be carried out in a limited place due to a large amount of heat generated, and thus the test site is limited and the loss of electric energy consumed by the test is large, . As an alternative to this, Korean Patent Registration No. 10-1153292 discloses a high-efficiency multi-function electric load test apparatus having a power regeneration function as a prior art document.

On the other hand, the relay used to supply and cut off the power operates when the power input reaches a certain set value, thereby supplying power to the other load circuit. However, since the commercial power source considered as the load is always 60Hz and AC 220V, if the phase and frequency of the voltage of the system line of the commercial power source do not match, the electric load tester transmits the electric power to the system line of the commercial power source A problem that can not be solved can occur. Further, when the regenerative electric power of the electric load testing apparatus is lower than the voltage of the system line of the commercial power supply, there is a problem that the electric current flows back to the electric load testing apparatus from the system line to damage the electric load testing apparatus.

The present invention has been proposed in order to solve the above-mentioned problems of the previously proposed methods, and it is an object of the present invention to provide an electric load testing apparatus for testing an electric operation characteristic of a device under test, In constructing the relay, the state of the system line of the commercial power supply is checked through the PLL, and the regenerative power of the electric load testing device and the system line of the commercial power supply are synchronized through the PLL, It is an object of the present invention to provide a relay device and a drive control method for delivering regenerative electric power of an electric load testing device to a system line, which is transmitted to a system line of a power source.

In addition, the present invention performs synchronization by using a PLL prior to connecting the regenerative power output from the electric load testing device to the system line of the commercial power supply by driving the relays, The regenerative electric power of the electric load test apparatus which can prevent the problem that electric power is not transmitted from the electric load testing apparatus due to the mismatch to the grid line, or that the regenerative electric power of the electric load testing apparatus is low, To a relay line and a drive control method for transmitting the relay line to a system line.

In addition, according to the present invention, since the relay unit in which a plurality of relays are connected in parallel is solved, the problem that the internal resistance value is increased due to the aging of the relay is solved and the life extension of the relay unit through the distributed supply of the regenerative power can be improved It is another object of the present invention to provide a relay device and a drive control method for power supply of an electric load testing device having a power regeneration function.

According to an aspect of the present invention, there is provided a relay apparatus for transmitting regenerative electric power to a system line of an apparatus for testing an electric load,

A relay apparatus for transmitting regenerative electric power of an electric load testing apparatus to a system line,

A regenerative power generator for receiving a power of a load power output from a device under test for testing an electric operation characteristic and regenerating the power to a commercial power source and outputting the regenerative power; An electric load test apparatus having a performance test section for testing an electric operation characteristic of the apparatus;

A commercial power source for receiving a regenerative power of an AC power outputted from a regenerative power generating unit of the electrical load testing apparatus; And

And a relay section which is connected between the electric load testing apparatus and the system line of the commercial power supply and is driven and controlled to supply and cut off the regenerative power of the AC power supplied from the regenerative electric power generating section of the electric load testing apparatus, .

Preferably, the regenerative power generating unit includes:

A rectifying circuit connected to the power supply supplied from the DUT to receive and supply rectified power from the DUT;

A DC filter circuit for filtering the power rectified from the rectifying circuit;

An inverter unit for regenerating the tested electric energy amount applied from the DC filter circuit to a commercial power supply; And

And an AC filter circuit for outputting the electric energy regenerated by the inverter unit to a sinusoidal AC power source from which harmonics have been removed.

Preferably, the relay unit includes:

The state information of the power line of the commercial power source is detected and confirmed through the PLL before the regenerative power of the AC power outputted from the regenerative power generator of the electrical load testing device is supplied to the power line of the commercial power source, It is possible to synchronously regenerate the regenerative power of the AC power outputted from the testing apparatus and drive the relay in a synchronized state so that the electric load testing apparatus can drive the power to be transmitted to the grid line of the commercial power supply.

More preferably, the relay unit includes:

A phase locked loop (PLL) may be used to synchronize the system line of the commercial power supply and the output voltage of the electric load testing apparatus.

More preferably, the relay unit includes:

A main relay for performing a main function of supplying and interrupting regenerative power of an AC power outputted from a regenerative power generating unit of the electric load testing apparatus;

A first sub relay connected in parallel with the main relay and driven to reduce a potential difference across the main relay;

A second sub-relay connected in parallel with the main relay and driven to compensate for an increase in the internal resistance of the main relay due to a contact aging of the main relay;

And controlling the regenerative power of the AC power outputted from the regenerative power generator of the electric load testing device to be synchronized based on the state information of the system line detected by the system line of the commercial power supply, A control unit for controlling the ON or OFF drive of one sub-relay and the second sub-relay, respectively; And

And a PLL (Phase Locked Loop) for reading and detecting the state of the system line of the commercial power supply and for synchronizing the regenerative power of the AC power outputted from the regenerative power generation unit of the electric load tester under the control of the controller Can be configured.

Still more preferably, the main relay includes:

It can function as a high-voltage switch as a large-capacity relay.

Still more preferably, the first and second sub-

And a relay of a small capacity smaller than the main relay.

Still more preferably, the first sub-

The main relay is turned on under the control of the control unit in the off state prior to the on operation of the main relay to raise the system line voltage of the commercial power supply through the resistor R at the rear stage, Which is turned on under the control of the control unit and is capable of detecting a voltage across the resistor R, under the control of the control unit, until the potential difference across the main relay reaches a predetermined reference range, Can be further formed.

Still more preferably, the main relay includes:

The first sub relay is turned off by reducing the potential difference between both ends of the relay in the on driving state and then the potential difference across the relay is turned on under the control of the control unit within a preset reference range Can be driven.

Still more preferably, the second sub-

And a control unit for controlling the regenerative power of the electric load based on the regenerative power of the alternating-current power outputted from the regenerative-power generating unit of the electric load testing apparatus and the phase of the voltage of the utility line of the commercial power supply after the on- Or at a timing in which the frequencies coincide with each other.

Still more preferably, the second sub-

The regenerative power of the alternating current power supplied from the regenerative power generator of the electric load tester can be distributed and supplied to the power line of the commercial power source.

Still more preferably,

A main relay, a first sub relay, and a second sub relay, which are connected in parallel, after controlling the PLL based on the system line state information of the commercial power supply to synchronize the regenerative power of the AC power outputted from the regenerative power generator of the electrical load testing device, The first sub relay, the main relay, and the second sub relay are controlled to be turned on in the order of the first sub relay, the second sub relay, and the second sub relay.

According to another aspect of the present invention, there is provided a method of controlling a relay apparatus for transmitting regenerative power to a system line,

A driving control method of a relay apparatus for transmitting regenerative electric power of an electric load testing apparatus to a system line,

(1) synchronizing the regenerative power of the AC power outputted from the electric load testing device by checking the state of the system line of the commercial power supply;

(2) the control unit controls the first sub relay to be on to minimize the voltage difference across the relay unit;

(3) controlling the main relay to turn on so that the regenerative power can be supplied to the system line of the commercial power supply; And

(4) The control unit controls the second sub relay to be on so that the regenerative power is dispersedly supplied to the system line of the commercial power supply through the main relay.

Preferably, in the step (1)

The controller can use the PLL to synchronize the regenerative power output from the regenerative power generator of the electric load tester from state information detected at the system line of the commercial power supply.

More preferably,

The regenerative power is not transmitted to the system line of the commercial power supply in the electrical load testing apparatus because the phase or frequency of the voltage of the system line of the electrical load testing apparatus and the commercial power supply do not match, It is possible to prevent the current from flowing back to the electric load test apparatus from the system line to damage the electric load test apparatus when the regenerative power is lower than the voltage of the system line of the commercial power supply.

Preferably, the main relay, the first sub-relay, and the second sub-

Wherein the regenerative power generation unit is connected in parallel between the regenerative power generation unit of the electric load test apparatus and the system power supply line of the commercial power supply, and when regenerative power is supplied between the regenerative power generation unit and the power supply line of the commercial power supply, , It is possible to compensate the increase of the internal resistance value of the main relay due to the contact aging.

More preferably, the main relay includes:

It can function as a high-voltage switch as a large-capacity relay.

Still more preferably, the first and second relays comprise:

And a small-capacity relay smaller than the main relay.

More preferably, in the step (2)

The voltage of the commercial power supply is increased through a resistor R connected in series to the rear end of the first sub relay under the control of the control unit. Under the control of the control unit, A current sensor may be further provided which is driven until reaching the set reference range and is turned off under the control of the control unit and can detect the voltage across the resistor R. [

More preferably, in the step (4)

And the second sub relay is driven under the control of the control unit after the main relay is turned on so that the regenerative power of the alternating current power outputted from the regenerative power generating unit of the electric load testing apparatus and the phase of the voltage of the power line of the commercial power supply Or at a timing in which the frequencies coincide with each other.

According to the relay device and the drive control method for transferring the regenerative electric power of the electric load testing device proposed in the present invention to the system line, the regenerative electric power output from the electric load testing device for testing the electric operation characteristics of the device under test In configuring the relay for transmission to the system line of the power supply, the state of the system line of the commercial power supply is confirmed through the PLL, and the regenerated power of the electric load testing apparatus and the system line of the commercial power supply are synchronized through the PLL The relay can be driven so that the regenerative power can be transmitted to the system line of the commercial power supply.

In addition, according to the present invention, before the relay is driven to connect the regenerative power output from the electric load testing device to the system power line of the commercial power supply, synchronization is performed using the PLL, It is possible to prevent the electric power from being transmitted to the system line from the electric load testing device due to the inconsistency of the electric load testing device or the problem that the regenerative electric power of the electric load testing device is low,

In addition, according to the present invention, since the relay unit in which a plurality of relays are connected in parallel is solved, the problem that the internal resistance value is increased due to the aging of the relay is solved and the life extension of the relay unit through the distributed supply of the regenerative power can be improved .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration of a conventional electric load testing apparatus. FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a relay apparatus,
3 is a view for explaining system line identification and synchronization of a relay apparatus for delivering regenerative electric power of an electric load testing apparatus according to an embodiment of the present invention to a system line;
4 is a view showing a detailed configuration of a relay part of a relay device for transmitting regenerative electric power of an electric load testing device according to an embodiment of the present invention to a system line.
5 is a view showing a flow of a drive control method of a relay apparatus for transmitting regenerative electric power of an electric load testing apparatus according to an embodiment of the present invention to a system line.
6 is a view showing operation timing of a relay unit in a relay apparatus for transmitting regenerative electric power of an electric load testing apparatus according to an embodiment of the present invention to a system line;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

FIG. 2 is a diagram showing the overall configuration of a relay device for transmitting regenerative electric power of an electric load testing apparatus according to an embodiment of the present invention to a system line, and FIG. 3 is a diagram showing an electric load test FIG. 4 is a view for explaining system line identification and synchronization of a relay apparatus for transmitting regenerative power of the apparatus to a system line. FIG. 4 is a diagram illustrating regenerative power of the apparatus for testing an electric load according to an embodiment of the present invention, Fig. 2 is a diagram showing a detailed configuration of a relay unit of a relay apparatus for delivering a relay apparatus. As shown in FIGS. 2 to 4, the relay apparatus for transmitting the regenerative electric power of the electric load testing apparatus according to the embodiment of the present invention to the system line includes an electric load testing apparatus 100, a commercial power source 200 ), And a relay unit 300. [

The electric load testing apparatus 100 includes a regenerative electric power generating unit 110 that receives power of a load electric power output from the device under test 10 for testing electric operation characteristics and regenerates the electric power to be supplied to a commercial power supply and outputs the electric power, And a performance test testing unit 120 for testing the electrical operation characteristics of the device under test 10 using the power of the load power amount output from the device 10. [ The electric load testing apparatus 100 includes a rectifying circuit 111 connected to a power supply supplied from the device under test 10 and supplied with a power of a load power amount output from the device under test 10 and rectifying the rectified power, A direct current filter circuit 112 for filtering the power rectified from the circuit 111, an inverter 113 for regenerating the tested electric energy amount applied from the direct current filter circuit 112 to a commercial power supply, And an alternating-current filter circuit 114 for outputting the electric energy regenerated by the regulator 113 to the sinusoidal-wave alternating-current power source from which harmonics have been removed.

The rectifying circuit 111 of the regenerative power generating unit 110 is connected to the DUT 10 and supplies power to the DUT 10 to rectify the load. Or a full bridge rectifier circuit for converting the direct current power into an electric load test device. The rectifier circuit 111 configured as a full bridge rectifier circuit can perform electrical load testing of various power supplies through a single test facility and can control the power source to be tested in a random manner. The rectifier circuit 111 may be composed of a combination of a low voltage input circuit, a high voltage circuit, a pulse width control rectifier circuit, a boost rectifier circuit, a voltage doubler rectifier circuit, a three-phase rectifier circuit, and the like. The DC filter circuit 112 of the regenerative power generating unit 110 functions to stabilize the electric energy used for the test and to efficiently supply the electric energy regenerated to the commercial power supply 200, A combination of a reactor and a capacitor may be used. That is, the direct current filter circuit 112 supplies the electric power to the inverter unit 113 efficiently and stably by the load test of the DUT 10, and the regenerated AC power is supplied to the AC filter circuit 114 from the harmonic ripple component So that the pure sine wave power can be regenerated to the system line of the commercial power supply 200. [

The commercial power supply 200 is configured to receive the regenerative power of the alternating current power output from the regenerative power generation unit 110 of the electrical load testing apparatus 100. [ The commercial power supply 200 receives the regenerative power of the AC power output from the regenerative power generation unit 110 of the electrical load testing apparatus 100 via the relay line unit 300 via the system line. Since the commercial power supply 200 corresponds to a configuration generally used in a normal power system, an unnecessary description will be omitted.

The relay unit 300 is connected between the electrical load testing apparatus 100 and the system line of the commercial power supply 200 to regenerate the regenerative power supplied from the regenerative power generating unit 110 of the electrical load testing apparatus 100 And is driven and controlled to supply and cut off power. The relay unit 300 is connected to the regenerative power generating unit 110 of the electric load testing apparatus 100 to regenerate the regenerative power of the commercial power supply 200 before supplying the regenerative power of the alternating- The state information of the system line is confirmed through the PLL 305, the regenerative power of the AC power outputted from the electric load testing apparatus 100 is synchronized, and the relay is driven in a synchronized state, And the power is transmitted to the system line of the power source 200. At this time, the relay unit 300 may use a phase locked loop (PLL) 305 to synchronize the system line of the commercial power supply 200 and the output voltage of the electric load testing apparatus 100. Hereinafter, the detailed configuration and operation of the relay unit 300 will be described in detail with reference to FIG.

4, the relay unit 300 includes a main relay (not shown) that performs a main function of supplying and interrupting the regenerative power of the alternating current power output from the regenerative power generating unit 110 of the electric load testing apparatus 100 A first sub relay 302 connected in parallel to the main relay 301 and driven to reduce a potential difference across both ends of the main relay 301; A second sub relay 303 which is driven to compensate for an increase in internal resistance of the main relay 301 due to a contact aging of the relay 301 and a second sub relay 303 which is connected to the state information of the power line detected by the power line of the commercial power source 200 The regenerative power of the AC power outputted from the regenerative power generating unit 110 of the electric load testing apparatus 100 is controlled to be synchronized with the main relay 301, the first sub relay 302, When the second sub-relay 303 is turned on or off And a control unit 304 for controlling the electric power supplied from the regenerative electric power generating unit 110 of the electric load tester 100 under the control of the control unit 304. [ And a phase locked loop (PLL) 305 for synchronizing the regenerative power of the power supply.

The main relay 301 functions as a high-voltage switch as a large-capacity relay, and the first and second sub-relays 302 and 303 may be configured as small-capacity relays smaller than the main relay 301. [ Here, the first sub-relay 302 is turned on under the control of the control unit 304 in the off state before the main relay 301 is turned on, The control unit 304 drives the system line voltage of the commercial power supply 200 until the potential difference across the main relay 301 reaches a predetermined reference range under the control of the control unit 304, Turn Off. The main relay 301 is turned off by reducing the potential difference between both ends of the relay in the on driving state of the first sub relay 302 and then the potential difference between both ends of the relay is controlled by the controller 304 And is driven to turn on under the control of the microcomputer. Here, a current sensor 306 capable of detecting a voltage may be further formed at both ends of the resistor R. [ That is, when the potential difference detected through the current sensor 306 is used, it is possible to know whether the current flows from the regenerative power inverter 110 to the system line or vice versa. At this time, in the former case, the main relay 301 is turned on, and in the opposite case, the main relay 301 is kept in the off state. Here, the resistor R uses a very large resistor to make the conducting current very small. Even after the main relay 301 is closed, the potential difference across the resistor R is continuously sensed by the current sensor 306. If a reverse current is detected due to a change in the environment, the main relay 301 is turned off, It is possible to prevent the electric load testing apparatus 100 from being damaged. After the main relay 301 is connected, the amount of current flowing to the main relay 301 is measured using the current sensor 306. When the amount of current exceeds the rated value, the second and third sub-relays 302, .

The second sub relay 303 is turned on under the control of the control unit 304 to turn on the regenerative electric power generating unit 110 of the electric load testing apparatus 100 after the main relay 301 is turned on And the voltage of the system line of the commercial power supply 200 coincide with each other. Here, the second sub-relay 303 is operated by being driven on with the driving of the main relay 301, whereby the regeneration of the alternating current power supplied from the regenerative power generation unit 110 of the electric load tester 100 Power can be distributed and supplied to the system line of the commercial power supply 200. [

The control unit 304 controls the PLL 305 based on the system line state information of the commercial power supply 200 to synchronize the regenerative power of the AC power output from the regenerative power generation unit 110 of the electrical load testing apparatus 100 . Thereafter, the control unit 304 controls on / off operations of the main relay 301, the first sub relay 302 and the second sub relay 303 connected in parallel, respectively, and the first sub relay 302, The relay 301 and the second sub relay 303 in order to regenerate the regenerative power of the AC power outputted from the regenerative power generation unit 110 of the electrical load testing apparatus 100 to the commercial power To the system line of the base station 200.

FIG. 5 is a flowchart illustrating a method of controlling a driving method of a relay apparatus for transmitting regenerative power of an apparatus for testing an electric load according to an embodiment of the present invention to a system line. FIG. Fig. 5 is a diagram showing the operation timing of the relay unit in the relay apparatus for transmitting the regenerative electric power of the electric load testing apparatus to the system line. Fig. As shown in FIG. 5, the driving control method of the relay apparatus for transmitting the regenerative electric power of the electric load testing apparatus according to the embodiment of the present invention to the system line includes a step (S100) of synchronizing the electric load testing apparatus, A step (S300) of operating the regenerative power to supply the regenerative power to the system line of the commercial power supply, and a step (S400) of distributing and supplying the regenerative power to the system line of the commercial power supply, May be implemented.

The relay device applied to the implementation of the driving control method of the relay device for transmitting the regenerative electric power of the electric load testing device according to the embodiment of the present invention to the system line can be configured as shown in Figs. 2 to 4 Will be described in detail with reference to the configurations shown in Figs. 2 to 4, respectively.

2 to 4, the relay device for transmitting the regenerative electric power of the electric load testing apparatus according to an embodiment of the present invention to the system line includes a regenerative power generation unit 110, a performance test A commercial power supply 200 and a relay unit 300. The electrical load testing apparatus 100 includes a testing unit 120, The relay unit 300 includes a main relay 301, a first sub relay 302, a second sub relay 303, a control unit 304, and a PLL 305. The functions of the specific configuration of the relay unit 300 configured as described above have been described above with reference to the relay apparatus, and a repeated description thereof will be omitted.

In step S100, the control unit 304 confirms the state of the system line of the commercial power supply 200 and synchronizes the regenerative power of the AC power outputted from the electrical load testing apparatus 100. [ That is, in step S110, the control unit 304 calculates the regenerative power output from the regenerative power generation unit 110 of the electric load testing apparatus 100 using the PLL 305 from the state information detected on the system line of the commercial power supply 200 Thereby synchronizing the power. As described above, the synchronization in the step S100 is not synchronized with the phase of the voltage of the system line of the electric load testing apparatus 100 and the power line 200 of the commercial power source 200, If the regenerative power is not delivered or the regenerative power output from the electric load testing apparatus 100 is lower than the voltage of the system line of the commercial power supply 200, the current flows back from the system line to the electric load testing apparatus 100 So that the electrical load testing apparatus 100 can be prevented from being damaged.

In step S200, when the synchronization is performed through the operation in step S100, the control unit 304 controls the first sub relay 302 to be on to minimize the voltage difference across the relay unit 300 . In this step S200, the system line voltage of the commercial power supply 200 is increased through the resistor R connected in series to the rear end of the first sub relay 302 which is turned on under the control of the control unit 304, Under the control of the controller 304, until the potential difference across the relay reaches a predetermined reference range, and can be turned off under the control of the controller 304. [ That is, step S200 shows the process of the operation timing 1 in Fig.

In step S300, when the first sub relay 302 is turned off through step S200, the control unit 304 controls the main relay 301 to be turned on so that the regenerated electric power is supplied to the system line of the commercial power supply 200 So that it can be supplied. In this operation S300, the first and second sub relays 302 and 303 are kept in the off state, and only the main relay 301 is operated. Here, a current sensor 306 capable of detecting a voltage across the resistor R may be further formed. That is, when the potential difference detected through the current sensor 306 is used, it is possible to know whether the current flows from the regenerative power inverter 110 to the system line or vice versa. At this time, in the former case, the main relay 301 is turned on, and in the opposite case, the main relay 301 is kept in the off state. Here, the resistor R uses a very large resistor to make the conducting current very small. Even after the main relay 301 is closed, the potential difference across the resistor R is continuously sensed by the current sensor 306. If a reverse current is detected due to a change in the environment, the main relay 301 is turned off, It is possible to prevent the electric load testing apparatus 100 from being damaged. After the main relay 301 is connected, the amount of current flowing to the main relay 301 is measured using the current sensor 306. When the amount of current exceeds the rated value, the second and third sub-relays 302, .

In step S400, the control unit 304 controls the second sub relay 303 to turn on, and the regenerative power is distributedly supplied to the system line of the commercial power supply 200 through the main relay 301. [ Here, in step S400, the second sub relay 303 is turned on under the control of the control unit 304 after the main relay 301 is turned on to output the regenerative power from the regenerative power generation unit 110 of the electric load tester 100 The regenerative power of the alternating-current power source and the voltage of the system line of the commercial power source 200 coincide with each other. That is, step S400 shows the process of operation timing 3 in Fig. Here, the second sub-relay 303 functions as a relay for compensating for an increase in the internal resistance of the relay due to the contact aging of the main relay 301, Even if the resistance value increases, the rise of the internal resistance value can be compensated for by the second sub relay 303 connected in parallel.

According to the relay device and the drive control method for transmitting the regenerative electric power of the electric load testing device according to the embodiment of the present invention to the system line, the regenerative electric power outputted from the electric load testing device for testing the electric operation characteristics of the device under test The PLL is used to check the state of the system line of the commercial power supply and the synchronization of the regenerative power of the electric load testing apparatus and the system line of the commercial power supply is performed through the PLL And the regenerative electric power is transmitted to the system line of the commercial power supply by driving the relay after the regenerative electric power is supplied to the power line, the power is not transmitted from the electric load testing device to the power line due to mismatch of the phase and frequency of the output regenerative power, The regenerative power of the load test device is low so that the problem of the current flowing back in the system line can be prevented It is good.

The present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics of the invention.

10: EUT device 20: Electrical load test device
21: Performance test Test section 22: Electrical resistance
23: ventilation circulation device 24: cooling device
100: electric load tester 110: regenerative power generator
111: rectification circuit 112: DC filter circuit
113: inverter unit 114: AC filter circuit
120: Performance test test section 200: Commercial power (line)
300: relay unit 301: main relay
302: first sub relay 303: second sub relay
304: control unit 305: PLL
306: Current sensor
S100: Synchronizing the electric load test apparatus
S200: Step of minimizing the voltage difference between the terminals of the relay
S300: Step of operating so that the regenerative power is supplied to the system line of the commercial power source
S400: Step of distributing and supplying regenerative power to the grid line of the commercial power source

Claims (20)

A relay apparatus for transmitting regenerative electric power of an electric load testing apparatus to a system line,
A regenerative power generation unit 110 for receiving a power of a load power amount output from the device under test 10 for testing an electric operation characteristic and regenerating and supplying the power to a commercial power source, An electric load testing apparatus (100) comprising: a performance test testing unit (120) for testing an electric operation characteristic of the device under test (10) using a power source;
A commercial power supply 200 for receiving regenerative power of the alternating current power output from the regenerative power generating unit 110 of the electrical load testing apparatus 100; And
The regenerative power generation unit 110 is connected between the electric load testing apparatus 100 and the utility power supply 200 and supplies regenerative power of the alternating current power supplied from the regenerative power generation unit 110 of the electric load testing apparatus 100 And a relay unit (300)
The relay unit 300 includes:
Before supplying the regenerative power of the AC power outputted from the regenerative power generation unit 110 of the electric load testing apparatus 100 to the power line of the commercial power source 200, the state information of the power line of the commercial power source 200 Is synchronized with the regenerative power of the alternating-current power outputted from the electric load testing device 100, and then the relay is driven in a synchronized state, Power is transmitted to the system line of the power source 200,
The relay unit 300 includes:
A phase locked loop (PLL) 305 is used for synchronizing the system line of the commercial power supply 200 and the output voltage of the electric load testing apparatus 100,
The relay unit 300 includes:
A main relay 301 for performing a main function of supplying and interrupting the regenerative power of the AC power outputted from the regenerative power generation unit 110 of the electric load testing apparatus 100, A first sub relay 302 connected to the main relay 301 and driven to reduce a potential difference across the main relay 301 and a second sub relay 302 connected in parallel with the main relay 301, A second sub relay (303) driven to compensate for an increase in the internal resistance value of the main relay (301); and a second sub relay The first sub relay 302 and the second sub relay 303 in synchronization with each other after controlling the regenerative power of the AC power outputted from the regenerative power generating unit 110 of the first relay 301 and the second relay 302 ) Is driven on or off A control unit 304 for controlling each of the power supplies 200 and 300 and a control unit 304 for reading and detecting the state of the power supply line of the commercial power supply 200 and controlling the regenerative power generation unit 110 of the electric load testing device 100, And a phase locked loop (PLL) 305 for synchronizing the regenerative power of the output AC power,
The control unit 304,
Controls the PLL 305 based on the grid line state information of the commercial power supply 200 to synchronize the regenerative power of the AC power outputted from the regenerative power generating unit 110 of the electric load testing apparatus 100, The first sub relay 302, the main relay 301, the second sub relay 302, and the second sub relay 303, which are connected in parallel to the main relay 301, the first sub relay 302 and the second sub relay 303, And the second sub relay (303) in order from the first sub relay (303) to the second sub relay (303).
2. The power converter according to claim 1, wherein the regenerative power generator (110)
A rectifying circuit 111 connected to the power supply supplied from the DUT 10 and supplied with power of a load power amount output from the DUT 10 and rectifying the rectified power;
A DC filter circuit (112) for filtering the power rectified from the rectifying circuit (111);
An inverter unit 113 for regenerating the tested electric energy amount applied from the DC filter circuit 112 to a commercial power supply; And
And an AC filter circuit (114) for outputting the electric energy regenerated by the inverter unit (113) to a sinusoidal AC power supply from which harmonics have been removed. The regenerative electric power of the electric load testing apparatus Relay device for transmitting.
delete delete delete The apparatus of claim 1, wherein the main relay (301)
A relay device for transmitting regenerative electric power of an electric load testing device to a system line, characterized by functioning as a high-voltage switch as a large-capacity relay.
7. The apparatus of claim 6, wherein the first and second sub-relays (302, 303)
And a relay having a small capacity smaller than that of the main relay (301), for relaying the regenerative electric power of the electric load testing apparatus to the system line.
The apparatus of claim 1, wherein the first sub-relay (302)
The main relay 301 is turned on under the control of the control unit 304 in the off state before the main relay 301 is turned on and is turned on via the resistor R The main relay 301 is driven until the potential difference between both ends of the main relay 301 reaches a predetermined reference range under the control of the control unit 304 and the turn- ), And a current sensor (306) capable of detecting a voltage across the resistor (R) is further formed. The relay device for delivering the regenerative electric power of the electric load testing apparatus to the system line.
The apparatus of claim 8, wherein the main relay (301)
The first sub relay 302 is turned off by reducing the potential difference between both ends of the relay in the on driving state and then the potential difference between both ends of the relay is turned on under the control of the controller 304 And the relay device is driven to turn on the relay device for transmitting the regenerative electric power of the electric load testing device to the system line.
2. The apparatus of claim 1, wherein the second sub-relay (303)
After the main relay 301 is turned on, the AC power supply is turned on under the control of the control unit 304 to output the AC power outputted from the regenerative power generating unit 110 of the electric load testing apparatus 100 And the regenerative electric power is operated only at a timing at which the regenerative power and the voltage of the system line of the commercial power supply (200) coincide with each other.
11. The apparatus of claim 10, wherein the second sub-relay (303)
The regenerative power generator 110 of the electric load tester 100 regenerates the regenerative power of the AC power supplied from the commercial power supply 200 by operating the on- And the regenerative power of the electric load testing device is supplied to the system line of the relay device.
delete A driving control method of a relay apparatus for transmitting regenerative electric power of an electric load testing apparatus to a system line,
(1) synchronizing the regenerative power of the AC power outputted from the electric load testing apparatus 100 by checking the state of the system line of the commercial power supply 200 by the control unit 304;
(2) controlling the first sub relay 302 to be on by the control unit 304 to minimize the voltage difference across the relay unit 300;
(3) controlling the main relay 301 to be turned on by the controller 304 so that regenerative power can be supplied to the system line of the commercial power supply 200; And
(4) controlling the second sub relay 303 to be on by the control unit 304 so that the regenerative power is distributed and supplied to the system line of the commercial power source 200 through the main relay 301 , ≪ / RTI &
In the above step (1)
The control unit 304 uses the PLL 305 from the status information detected at the system line of the commercial power supply 200 to synchronize the regenerative power output from the regenerative power generation unit 110 of the electrical load testing apparatus 100 And,
The main relay 301, the first sub relay 302 and the second sub relay 303 are connected to the regenerative power generating unit 110 of the electric load testing apparatus 100 and the system line of the commercial power supply 200, And when regenerative power is supplied between the regenerative power generating unit 110 and the system power supply line 200, the deterioration of the relay contacts, the deterioration of the relay contacts, The main relay 301 performs the main function of supplying and interrupting the regenerative power of the alternating current power output from the regenerative power generating unit 110 of the electric load testing apparatus 100, 1 sub relay 302 is driven to reduce the potential difference across both ends of the main relay 301 and the second sub relay 303 is connected to the main relay 301, Is driven to compensate for the increase in resistance value,
The control unit 304,
Controls the PLL 305 based on the grid line state information of the commercial power supply 200 to synchronize the regenerative power of the AC power outputted from the regenerative power generating unit 110 of the electric load testing apparatus 100, The first sub relay 302, the main relay 301, the second sub relay 302, and the second sub relay 303, which are connected in parallel to the main relay 301, the first sub relay 302 and the second sub relay 303, And the second sub relay (303) in order from the first sub relay (303) to the second sub relay (303).
delete 14. The method of claim 13,
Since the phase and frequency of the voltage of the system line of the electrical load testing apparatus 100 and the commercial power supply 200 do not coincide with each other, the regenerative power is not transferred from the electrical load testing apparatus 100 to the system line of the commercial power supply 200 Or when the regenerative power output from the electric load testing apparatus 100 is lower than the voltage of the system line of the commercial power supply 200, the current flows back from the system line to the electric load testing apparatus 100, And a function of preventing the test apparatus (100) from being damaged is characterized in that a regenerative electric power of the electric load testing apparatus is transmitted to the system line.
delete 14. The apparatus of claim 13, wherein the main relay (301)
And a high-voltage switch serving as a relay of a large capacity, and for transmitting the regenerative electric power of the electric load tester to the system line.
18. The apparatus of claim 17, wherein the first and second relays (302, 303)
And a relay having a small capacity smaller than that of the main relay (301), wherein the regenerative power of the relay is transmitted to the system line.
14. The method according to claim 13, wherein in the step (2)
The line voltage of the commercial power supply 200 is increased through the resistor R connected in series to the rear end of the first sub relay 302 which is turned on under the control of the controller 304, Which is turned off under the control of the control unit 304 and is capable of detecting a voltage across the resistor R, under the control of the control unit 304 until the potential difference across the relay reaches a predetermined reference range, (306) is further formed between the first and second electric load testing devices.
14. The method of claim 13, wherein in step (4)
The second sub relay 303 is turned on under the control of the control unit 304 and is output from the regenerative electric power generating unit 110 of the electric load tester 100 after the main relay 301 is turned on Characterized in that the regenerative electric power generator is operated only at a timing when the regenerative electric power of the AC power source and the voltage of the system line of the commercial power source (200) coincide with each other. Control method.
KR1020150162885A 2015-11-19 2015-11-19 A relay device and drive control method for transferring power generated in the electrical load testing equipment to grid connection KR101728681B1 (en)

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CN109283419A (en) * 2018-12-03 2019-01-29 河北工业大学 Low-voltage electrical apparatus electrical endurance test device based on DC solid fictitious load
CN109617436A (en) * 2018-11-07 2019-04-12 易事特集团股份有限公司 A kind of and off-network inverter locking phase pre-synchronization method

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Publication number Priority date Publication date Assignee Title
JP2002078208A (en) * 2000-08-28 2002-03-15 Honda Motor Co Ltd Engine generating device
KR101153292B1 (en) * 2010-12-15 2012-06-08 주식회사 뉴피에스 Power saving and electrical load multi testing system

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Publication number Priority date Publication date Assignee Title
JP2002078208A (en) * 2000-08-28 2002-03-15 Honda Motor Co Ltd Engine generating device
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109617436A (en) * 2018-11-07 2019-04-12 易事特集团股份有限公司 A kind of and off-network inverter locking phase pre-synchronization method
CN109283419A (en) * 2018-12-03 2019-01-29 河北工业大学 Low-voltage electrical apparatus electrical endurance test device based on DC solid fictitious load
CN109283419B (en) * 2018-12-03 2023-08-18 河北工业大学 DC solid-state simulation load-based electric life test device for piezoelectric device

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