KR101001643B1 - Power converter, energy-saving load test method of power converter and computer-readable recording media including energy-saving load test function - Google Patents

Power converter, energy-saving load test method of power converter and computer-readable recording media including energy-saving load test function Download PDF

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Publication number
KR101001643B1
KR101001643B1 KR1020100083532A KR20100083532A KR101001643B1 KR 101001643 B1 KR101001643 B1 KR 101001643B1 KR 1020100083532 A KR1020100083532 A KR 1020100083532A KR 20100083532 A KR20100083532 A KR 20100083532A KR 101001643 B1 KR101001643 B1 KR 101001643B1
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South Korea
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load
power
converter
test
output
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KR1020100083532A
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Korean (ko)
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김성조
백석민
신기엽
이동주
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국제통신공업 주식회사
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Publication of KR101001643B1 publication Critical patent/KR101001643B1/en
Priority to PCT/KR2011/005588 priority patent/WO2012026683A1/en

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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

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Abstract

The present invention does not use the general resistance or power factor load tester used for load testing of various power converters or DC voltage source discharge tests, and converts the output power of the reverse converter internal power converter through an output switch and a bypass switch. By re-supplying the input power, it does not consume all the energy as heat like general resistance or power factor load tester, but recirculates to the forward conversion part to save energy that requires only the minimum loss of the power conversion device when testing the power converter load. Power conversion device with built-in energy saving load test function that can be utilized without moving or installing a separate load tester and test cable in the power conversion device installed and operated in the field as the type load test function, and the energy saving load of the power conversion device On the computer recording the test method and the method A recording medium that can.

Description

Power converter, energy-saving load test method of power converter and computer-readable recording media including energy-saving load test Function}

The present invention relates to a power conversion device, and more particularly, a power conversion device with a built-in energy saving load test function by the circulation and regenerative power, which enables the load test of the power conversion device without installing a separate load tester; The present invention relates to an energy saving load test method of a power converter and a computer readable recording medium recording the method.

The power converter is a device that converts an input power source into a direct current by an AC-DC conversion and a DC-AC conversion, charges a voltage source (eg, a battery), and converts the DC power source into an AC power source required by the load side.

1 is a block diagram of a conventional power converter. As shown therein,

An input filter unit 10 including a boost reactor and an AC capacitor,

A forward conversion unit 20 for converting AC power output from the input filter unit 10 into DC power;

DC condenser unit 30 for smoothing the DC power converted by the forward conversion unit 20,

A DC voltage source 40 for receiving and storing the stabilized DC power from the DC condenser unit 30 and outputting it when the input power is outage or outputting to an external DC power source;

An inverting converter 50 for converting the DC power of the DC capacitor 30 and the DC voltage source 40 into AC power;

An output filter unit 60 composed of a filter reactor and an AC condenser for filtering the sine wave by removing harmonics of the AC power output from the inverse transform unit 50,

An output switch 70 for outputting the output of the output filter unit 60 to a load side during normal operation;

Bypass switch 80 for bypassing the input power to the load side in the event of a power converter failure and

The forward conversion unit (10) monitors the input voltage and current of the input filter unit 10, the bypass voltage, the voltage and current of the voltage source 40, and the output voltage and current of the output filter unit 60. 20) and a control unit 100 for controlling the drive of the inverse conversion unit 50 and the switch drive control of the output switch 70 and the bypass switch 80.

Here, a breaker is installed between the output end of the output switch 70 and the bypass switch 80 and the load side, and the control unit 100 detects contact information of the breaker and controls the breaker.

The input filter unit 10 includes a boosting capacitor and an AC capacitor, and the boosting reactor stores the input AC energy in the reactor and supplies a voltage applied to the DC capacitor when the semiconductor switch in the forward converter is turned OFF. The voltage is increased and a primary LC filter is formed together with the AC capacitor to prevent the switching noise of the forward conversion unit 20 from flowing back to the power supply side.

The forward conversion unit 20 is a three-phase full-wave bridge rectifier composed of a semiconductor switching element, and is a switching power supply that continuously supplies a DC voltage having a low ripple to a DC capacitor.

The DC condenser 30 stores DC power from the normal converter 20 at normal times and discharges it instantaneously when the load suddenly changes, thereby supplying and buffering DC power to the reverse converter 50.

The DC voltage source 40 stores the DC energy of the forward conversion unit 20 when the input power of the power converter is normal, and supplies DC energy to the reverse converter 50 when the power converter input power is outage or abnormal. It is an energy storage and discharge device that can be continuously supplied for a certain time. Typical DC voltage sources that can be used include batteries, supercapacitors and flywheel energy storage devices.

The reverse conversion unit 50 is a three-phase full-wave bridge inverter unit composed of a semiconductor switching element switching power supply for converting the DC power from the forward conversion unit 20 and the DC voltage source 40 to the AC power required on the load side to be.

The output filter unit 60 is a primary LC filter including a filter reactor and an AC capacitor installed to remove harmonics included in the output voltage waveform of the inverse transform unit 50. It is a filter part to make it.

The output switch 70 composed of a semiconductor switch is a semiconductor switch capable of energizing an alternating current formed by connecting a thyristor element in parallel and in parallel with the reverse converter 50 and the load side when the reverse converter 50 is abnormal or under load-side overload and short-circuit conditions. It is a high speed switch that can cut off the connection immediately.

The bypass switch 80 constituted by a semiconductor switch is a semiconductor switch capable of energizing an alternating current formed by connecting a thyristor element in reverse parallel, and is a high-speed switch capable of immediately supplying bypass-side power in the event of an inverter failure or overload.

The control unit 100 monitors an input voltage and a current, a bypass voltage, a voltage and a current of a DC voltage source, an output voltage and a current, and drives the forward converter 20 and the reverse converter 50. As a device for controlling and controlling the output switch 70 and the bypass switch 80, it is operated by software in accordance with the operation mode of the driver.

In the power converter configured as described above, the load test for the reliability test of the power converter is a necessary test item for all power converters. Conventionally, the power converter manufacturer manufactures a resistor or a power factor load device for this load test. Had to hold. Such a load dissipates electrical energy passing through the power converter as heat, and consumes electrical energy in proportion to the time during a long time load test of the power converter.

In addition, power converter manufacturers have to provide a separate cooling device for cooling the heat generated from such a load, and the actual cost of the power bill is high. In the reality that the user of the power converter does not have a dedicated load device for such a load test, in spite of the fact that the load test is necessary in case of internal component failure of the power converter in operation or after periodical overhaul and replacement of parts, The reality is that you can't load test.

In order to improve the above problems, the present invention is to provide a power converter having an energy-saving load test function to enable the power converter load test without installing a separate load tester.

The present invention provides an energy-saving load test method of a power converter that performs a virtual load test using a cyclic power by connecting the inverse converter output side with the forward converter input side in order to enable a load test without a separate load tester. .

In another aspect, the present invention is to provide an energy-saving load test method of the power converter that can perform the discharge test of the DC voltage source while regenerating the output power of the reverse converter to the input power side during the DC voltage source discharge test.

In another aspect, the present invention is to provide a computer-readable recording medium recording the energy saving load test method of the power conversion device as a program.

The power converter according to the present invention is a method of performing a virtual load test by software of the control unit of the power converter without having a separate load tester, and connects the reverse converter output side of the power converter to the forward converter input side and circulates. It is a power conversion device that saves the energy saving load test method for the load conversion test of the forward conversion part, the reverse conversion part, the output switch and the bypass switch.

In addition, the power converter according to the present invention stops the operation of the forward converter, and drives only the reverse converter, thereby regenerating the DC power from the DC voltage source to the input power through the reverse converter, the output switch, and the bypass switch to discharge the DC voltage source and This is a power converter that is stored in the control part by a program for the load test of the reverse converter.

Energy saving load test method of the power converter according to the present invention,

The input power is converted from DC converter to DC power and charged to DC voltage source, and the DC converter converts AC power, and the output of the reverse converter is output to the load through the output switch, or the input power is transferred directly through the bypass switch. In the load test method of the power conversion device configured to output to the load side,

A load blocking checking step of determining whether the connection between the power converter and the load side is cut off when the operation mode is the “load test mode” by determining the operation mode;

A normal startup step of receiving a test load quantity and a test load power factor to be tested from a user, and starting the forward conversion unit and the inverse conversion unit in order;

A phase control step of controlling the forward conversion unit so that the DC voltage output from the forward conversion unit is maintained at a constant value, and controlling the inverse conversion unit such that the voltage waveform of the bypass switch input power and the output waveform of the inverse conversion unit coincide with each other. Wow;

In the phase control step, it is determined whether the phase of the output waveform and the input voltage waveform of the inverse converter are synchronized, and if it is determined that the phase is in a synchronous state, the output switch and the bypass switch are sequentially connected to feed back the output of the output switch to the input power. A circuit forming step;

When the circuit is formed in the circuit forming step, the test load is set by detecting the current and voltage flowing through the output switch, comparing the test load input by the user and the test load power factor, and adjusting the phase and magnitude of the reverse converter output voltage. And a test load control step of controlling to be equal to the test load power factor;

The test load control step monitors the operation state of the power converter including the forward converter and the reverse converter for a preset test time while controlling the current amount of the output switch to be maintained in the same state as the set test load amount and test load power factor. It is characterized in that it is made to perform a test judgment step to determine whether or not normal.

In addition, a computer-readable recording medium recording a program for the energy saving load test of the power conversion device according to the present invention,

In a computer-readable recording medium recording a program for load test of the power converter,

A normal startup step of receiving a test load amount and a test load power factor to be tested from a user, and starting the forward converter and the reverse converter in order;

A phase control step of controlling the forward conversion unit so that the DC voltage output from the forward conversion unit is maintained at a constant value, and controlling the inverse conversion unit such that the voltage waveform of the bypass switch input power and the output waveform of the inverse conversion unit coincide with each other; ;

In the phase control step, it is determined whether the phase of the output waveform and the input voltage waveform of the inverse converter are synchronized, and if it is determined that the phase is in a synchronous state, the output switch and the bypass switch are sequentially connected to feed back the output of the output switch to the input power. A circuit forming step;

When the circuit is formed in the circuit forming step, the test load is set by detecting the current and voltage flowing through the output switch, comparing the test load input by the user and the test load power factor, and adjusting the phase and magnitude of the reverse converter output voltage. And a test load control step of controlling to be equal to the test load power factor;

The test load control step monitors the operation state of the power converter including the forward converter and the reverse converter for a preset test time while controlling the current amount of the output switch to be maintained in the same state as the set test load amount and test load power factor. It is characterized in that it is made to perform a test judgment step to determine whether or not normal.

In addition, the energy saving load test method of the power converter according to the present invention,

The input power is converted from DC converter to DC power and charged to DC voltage source, and the DC converter converts AC power, and the output of the reverse converter is output to the load through the output switch, or the input power is transferred directly through the bypass switch. In the load test method of the power conversion device configured to output to the load side,

When the DC voltage discharge test mode is selected in the operation mode judgment, after confirming the disconnection state between the power converter and the load side and receiving the test load, the operation of the forward converter stops and the reverse converter starts to discharge the DC voltage source. A discharge power phase synchronous control step of converting a power source from an inverse converter to an AC power source and controlling an inverse converter to synchronize phases of an input voltage waveform and an output voltage waveform;

An output current detection step of detecting a current and a voltage flowing through an output switch after the phases are synchronized in the discharge power phase synchronization control step;

A load amount judgment step of judging whether the output current detected in the output current detection step is equal to a test load amount set by a user and a test load power factor;

A load amount following control step of adjusting an output voltage phase of the inverse converter so that an output current amount of an output switch is equal to a set test load amount in the load amount determination step;

In the load follow-up control step, the output current amount is controlled to be equal to the set test load amount, and a discharge test judgment step is performed to monitor whether the reverse conversion unit, the output switch and the bypass switch are in operation during the set test time. It is characterized by.

In addition, the computer-readable recording medium recording the program for the energy saving load test of the power conversion device according to the present invention,

In a computer-readable recording medium recording a program for load test of the power converter,

When the DC voltage discharge test mode is selected in the operation mode judgment, after confirming the disconnection state between the power converter and the load side and receiving the test load, the operation of the forward converter stops and the reverse converter starts to discharge the DC voltage source. A discharge power phase synchronous control step of converting a power source from an inverse converter to an AC power source and controlling an inverse converter to synchronize phases of an input voltage waveform and an output voltage waveform;

An output current and output voltage detection step of detecting current and voltage flowing through an output switch after the phases are synchronized in the discharge power phase synchronization control step;

A load amount determination step of comparing and determining whether the output current detected in the output current and output voltage detection step is equal to a test load amount and a test load power factor set by a user;

A load amount and load power factor following control step of adjusting an output voltage phase and magnitude of the reverse converter so that the output current and output voltage of the output switch are equal to the set test load amount and test load power factor in the load amount determination step;

In the load amount and load power factor following control step, while controlling the output current amount to be equal to the set test load amount and load power factor, the discharge test to determine whether or not normal by monitoring the operating state of the reverse converter, the output switch and the bypass switch during the set test time The determination step is characterized in that the control unit of the power converter is made to perform.

Thus, according to the present invention, through the energy saving load test function, it is possible to drastically reduce the energy wasted by the resistance or power factor loading during the existing load test, and the power conversion device installed and operated without a separate load test facility. By enabling load testing, the serviceability and reliability of power converters can be significantly increased.

1 is a basic configuration of a general power converter
2 is a schematic diagram of power circulation and regeneration in the load test of the power converter according to the present invention.
3 is a cyclic power flow chart of the forward conversion unit / reverse conversion unit / bypass side load test according to the present invention.
Figure 4 is a flow chart of the regenerative power during the reverse load test using a DC voltage source according to the present invention.
5 is a flowchart illustrating a method for testing energy saving load of a power converter according to the present invention.

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

2 is a schematic diagram of power circulation and regeneration in the load test of the power converter according to the present invention. 3 is a cyclic power flow chart during the forward conversion unit / reverse converter / bypass side load test according to the present invention, Figure 4 is a flow chart of the regenerative power during the load conversion load test using a DC voltage source according to the present invention, Figure 5 It is a flowchart explaining the energy saving load test method according to the invention. 3 and 4, the control unit is not shown, but is a configuration included in the power converter.

An input filter unit 10 for receiving power, a forward conversion unit 20 for converting the input AC power into a DC power source, and a DC condenser unit 30 for smoothing the DC power converted in the forward conversion unit 20. ), A DC voltage source 40 for charging a smooth DC power source, a reverse converter 50 for converting DC power of the DC capacitor unit 30 and the DC voltage source 40 to AC power, and an inverse converter ( An output filter unit 60 for filtering the AC power of 50, an output switch 70 for outputting the output power of the output filter unit 60 to the load side, and an input power output directly to the load side in case of a power converter failure; Monitoring the bypass switch 80 and the input voltage and current, the output voltage and current and the voltage and current of the bypass voltage and the direct current voltage source while the forward conversion unit 20 and the reverse conversion unit 50 and the output switch ( 70) and a control unit 100 for controlling the bypass switch 80. In the load test method of the following power converter,

The output of the output switch 70 is fed back to the input filter unit 10 through the bypass switch 80 by software of the control unit 100 of the power converter without a separate load tester. In addition, the forward conversion unit 20 and the inverse conversion unit 50 are controlled to control the output current of the inverse conversion unit 50 to the set test load amount to perform a virtual load test.

In addition, the present invention, in the discharge test mode of the DC voltage source, by connecting the DC power from the DC voltage source 40 to the input power supply terminal through the reverse converter 50, the output switch 70 and the bypass switch 80 to the DC voltage source The discharge and reverse converter 50 can be loaded.

The load test method of the power converter according to the present invention is implemented by the control program of the controller 100 to use the cyclic power by feeding back the power output from the power converter to the input terminal of the power converter.

Determining the operation mode (S1) and when the operation mode is the “load test mode” (S10), checking whether the load is disconnected from the power converter and the load side (S11);

A normal startup step (S13) of receiving a test load quantity and a test load power factor to be tested from a user (S12), and starting the forward conversion unit 20 and the inverse conversion unit 30 in order;

The forward conversion unit 20 is controlled to maintain the DC voltage output from the forward conversion unit 20 at a constant value, and the inverse conversion is performed such that the voltage waveform of the input power source coincides with the phase of the output waveform of the inverse conversion unit 50. A phase control step (S14) of controlling the unit 50;

In the phase control step S14, it is determined whether the phase of the output waveform and the input voltage waveform of the inverse conversion unit 50 are synchronized, and when it is determined that the phase is synchronized, the output switch 70 and the bypass switch 80 are sequentially turned on. A circulation circuit forming step (S15) of conducting and feeding back the output of the output switch 70 to an input power source;

When the circuit is formed in the circuit forming step (S15), the current and voltage flowing through the output switch 70 is detected (S16), and compared with the test load input by the user, the output voltage of the inverse converter 50 A test load and test load power factor control step (S17, S18) for controlling the phase and magnitude of the waveform to be equal to the set test load and test load power factor;

By the test load and the test load power factor control step (S17, 18) while controlling the current amount of the output switch 70 is maintained at the same state as the set test load factor and the test load power factor, the forward conversion unit 20 for a predetermined test time And it is characterized in that it is made to perform a test judgment step of determining the normal by monitoring the operating state of the power converter including the inverse conversion unit (50).

In addition, the present invention when the DC voltage source discharge test mode is selected in the operation mode determination (S31),

After checking the disconnection state between the power converter and the load side and receiving the test load amount and the test load power factor, the operation of the forward conversion unit 20 is stopped, and the reverse conversion unit 50 is started to operate the DC voltage source ( A discharge power phase synchronous control step (S32) of converting the discharge power of the 40 into an AC power in the inverse conversion unit 50, and controlling the inverse conversion unit 50 to synchronize the phase of the input voltage waveform and the output voltage waveform;

An output current and output voltage detection step (S33) for detecting a current flowing through an output switch after the phases are synchronized in the discharge power phase synchronization control step (S32);

A load amount determination step (S34) for comparing and determining whether the output current detected in the output current detection step is equal to a test load amount and a test load power factor set by a user;

The load amount and load power factor following control step of adjusting the output voltage phase and magnitude of the inverse converter 50 so that the output current amount of the output switch 70 is equal to the set test load amount and the test load power factor in the load amount determination step S34 ( S35);

In the test load amount and the test load power factor following control step (S35), while controlling the output current amount to be equal to the set test load amount and test load power factor, the reverse converter 50, the output switch 70, and the bypass switch during the set test time ( 80) is performed to perform the discharge test determination step of monitoring the operation state of the normal.

On the other hand, in the normal operation mode in the operation mode determination step (S1), the normal startup step (S21) for starting the forward conversion unit 20 and the reverse conversion unit 50 normally; The forward conversion unit 20 is controlled to maintain the DC voltage output from the forward conversion unit 20 at a constant value, and the voltage waveform of the input power of the bypass switch 80 and the output waveform of the inverse conversion unit 50. A phase control step (S22) of controlling the inverse transform unit 50 so that the phases of the phases coincide with each other; When the phase synchronization is achieved, the output switch 70 is turned on, and the bypass switch 80 is turned off (S24) to perform an output step of supplying the output of the power converter to the load side. Here, although only the test load amount is described in step S11 and step S17 of FIG. 5, the present invention is not limited thereto, and the test load amount and the test load amount according to the detected current amount are input (S11) and the test load amount and test power factor are input. The load power factor is compared (S17).

Such a present invention may be implemented by a control program of the control unit 100 of the power converter, the load test control program of the power converter may be a program stored in its own memory area of the controller 100, It is connected to the control unit 100 can be stored in the program recording medium for executing the program by the control unit 100, the program recording medium as an internal storage means (e.g. memory) or an external storage means (e.g. USB memory).

In the "load test mode" S10 according to the present invention, as illustrated in FIG. 3, the forward conversion unit 20, the inverse conversion unit 50, the output switch 70, and the bypass switch ( The load test of 80) can be carried out at one time without additional load. To this end, the forward converter 20 and the reverse converter 50 are normally started, and the reverse converter 50 is controlled such that the output voltage waveform of the reverse converter 50 is synchronized with the voltage waveform of the input side (bypass side). The output switch 70 and the bypass switch 80 are simultaneously conducted.

In order to apply only the test load and the load power factor set by the user to the forward converter 20 and the reverse converter 50, the phase and magnitude of the output voltage waveform of the reverse converter 50 with respect to the input (bypass) voltage waveform are adjusted. It is a technique for adjusting and monitoring the current and voltage flowing through the output switch 70 to follow the set test load.

Therefore, in the 100% load test, only 10% of the power converter (based on 90% efficiency) is enough to actually enter the power converter from the input power source.

In addition, the "DC voltage source discharge test mode" according to the present invention, as shown in Figure 4, during the discharge test of the DC voltage source 40 through the reverse converter 50, the output power of the reverse converter 50 output switch 70 Regeneration to the input power through the bypass switch 80 and. Since the power converter fed back to the input power terminal is in a state where the forward conversion unit 20 is in a stop state, power is supplied to another power converter or another load side connected to the input power terminal, thereby regenerating power discharged from the DC voltage source 40. It can be used.

In order to ensure that only the test load set by the user is applied to the inverse conversion unit 50, the phase and magnitude of the output voltage waveform of the inverse conversion unit 50 with respect to the input side (bypass side) voltage waveform are adjusted and flowed to the output switch 70. Monitor current and voltage to follow set test load and test load power factor.

Therefore, if the load applied to the reverse converter 50 is equal to the capacity of the power converter, since 100% of the energy is regenerated to the input power source and can be used in another power converter connected to the input power source, a separate external load is installed and Significant energy savings can be achieved compared to the voltage source discharge test.

Thus, according to the present invention, through the energy saving load test function, it is possible to drastically reduce the energy wasted by the resistance or power factor loading during the existing load test, and the power conversion device installed and operated without a separate load test facility. By enabling load testing, the serviceability and reliability of power converters can be significantly increased.

For example, in case of 100kW load test of power converter, considering power converter efficiency, input power capacity needs 110kW and at least 10 hours load test, power consumption is 110kW x 10h = 1100 kWh.

However, when the 10 hour load test of the power converter using the energy saving load test function using circulating power, the power consumption is 10kW x 10h = 100kWh, which is only 9.1% (100kWh / 1100kWh x 100 = 9.1%) of the power consumption during the existing load test. The same load test can be carried out, which saves 90.9% of energy.

The present invention is not limited to the above-described embodiments, and of course, modifications can be made by those skilled in the art without departing from the spirit of the present invention. Therefore, the scope of the claims in the present invention will not be defined within the scope of the detailed description, but will be limited to the claims below.

10: input filter unit composed of a booster reactor and an AC condenser
20: forward conversion unit for converting AC power into DC power
30: DC condenser
40 DC voltage source
50: reverse conversion unit for converting AC power to DC power
60: output filter unit composed of filter reactor and AC condenser
70: output switch composed of a semiconductor switch
80: bypass switch composed of a semiconductor switch
100: control unit

Claims (6)

The input power is converted from DC converter to DC power and charged to DC voltage source, and the DC converter converts DC power to AC power and supplies it to the load side through output switch, or input power directly to the load side through bypass switch. In the power converter configured to control the control unit to supply,
With the output switch and the bypass switch turned on simultaneously with the power converter and the load side disconnected, the reverse converter output power is circulated to the forward converter input side, and the output current amount of the output switch is set by the user. The control unit is a program for performing a load test method of the power converter which performs a load test by controlling the output voltage phase and magnitude of the inverse converter so as to follow the load and the test load power factor. The power converter characterized in that stored in the executable.
The input power is converted from DC converter to DC power and charged to DC voltage source, and the DC converter converts DC power to AC power and supplies it to the load side through output switch, or input power directly to the load side through bypass switch. In the power converter configured to control the control unit to supply,
With the connection between the power converter and the load side disconnected, the operation of the forward converter is stopped, and the DC power source from the DC voltage source is connected to the input power source through the reverse converter, output switch and bypass switch while driving only the reverse converter. Power conversion to perform discharge load test of DC current source by controlling the output voltage phase and magnitude of the reverse converter so that the output current amount of the switch follows the test load amount and the test load power factor set by the user to monitor the operation state of the power converter. And a program for performing a load test method of the device is executable to the control unit.
The input power is converted from DC converter to DC power and charged to DC voltage source, and the DC converter converts AC power, and the output of the reverse converter is output to the load through the output switch, or the input power is transferred directly through the bypass switch. In the load test method of the power conversion device configured to output to the load side,
A load blocking checking step of determining whether the connection between the power converter and the load side is cut off when the operation mode is the “load test mode” by determining the operation mode;
A normal startup step of receiving a test load amount and a test load power factor to be tested from a user, and starting the forward converter and the reverse converter in order;
A phase for controlling the forward conversion unit so that the DC voltage output from the forward conversion unit is maintained at a constant value, and controlling the inverse conversion unit such that the voltage waveform of the bypass switch input power and the phase and magnitude of the output waveform of the inverse conversion unit coincide with each other. A control step;
In the phase control step, it is determined whether the phase of the output waveform and the input voltage waveform of the inverse converter are synchronized, and if it is determined that the phase is in a synchronous state, the output switch and the bypass switch are sequentially connected to feed back the output of the output switch to the input power. A circuit forming step;
When the circuit is formed in the circuit forming step, the current and voltage flowing through the output switch are detected, and the phase and magnitude of the inverse converter output voltage are adjusted by comparing with the test load and the test load power factor input by the user. A test load control step of controlling to be equal to the test load and the test load power factor; and
The test load control step monitors the operation state of the power converter including the forward converter and the reverse converter for a preset test time while controlling the current amount of the output switch to be maintained in the same state as the set test load amount and test load power factor. Energy saving load test method of the power converter characterized in that it is made to perform a test judgment step to determine whether or not normal.
The input power is converted from DC converter to DC power and charged to DC voltage source, and the DC converter converts AC power, and the output of the reverse converter is output to the load through the output switch, or the input power is transferred directly through the bypass switch. In the load test method of the power conversion device configured to output to the load side,
When the DC voltage discharge test mode is selected in the operation mode judgment, after confirming the disconnection state between the power converter and the load side and receiving the test load, the operation of the forward converter stops, and the reverse converter starts to discharge the DC voltage source. A discharge power phase synchronous control step of converting a power source from an inverse converter to an AC power source and controlling an inverse converter to synchronize phases of an input voltage waveform and an output voltage waveform;
An output current and output voltage detection step of detecting current and voltage flowing through an output switch after the phases are synchronized in the discharge power phase synchronization control step;
A load amount and load power factor determination step of comparing and determining whether the output current detected in the output current detection step is equal to a test load amount and a test load power factor set by a user;
A load follow-up control step of adjusting an output voltage phase and magnitude of the inverse converter so that an output current amount of an output switch is equal to a set test load amount and a test load power factor in the load amount and load power factor determination step;
In the load follow-up control step, the output current amount is controlled to be equal to the set test load amount and load power factor, and the discharge test judgment step of determining whether or not it is normal by monitoring the operating states of the reverse converter, the output switch and the bypass switch during the set test time. Energy saving load test method of the power converter characterized in that it is made to perform.
In a computer-readable recording medium recording a program for load test of the power converter,
A load blocking checking step of determining whether the connection between the power converter and the load side is cut off when the operation mode is the “load test mode” by determining the operation mode;
A normal startup step of receiving a test load amount and a test load power factor to be tested from a user, and starting the forward conversion unit and the inverse conversion unit normally;
A phase control step of controlling the forward conversion unit so that the DC voltage output from the forward conversion unit is maintained at a constant value, and controlling the inverse conversion unit such that the voltage waveform of the bypass switch input power and the output waveform of the inverse conversion unit coincide with each other; ;
In the phase control step, it is determined whether the phase of the output waveform and the input voltage waveform of the inverse converter are synchronized, and if it is determined that the phase is in a synchronous state, the output switch and the bypass switch are sequentially connected to feed back the output of the output switch to the input power. A circuit forming step;
When the circuit is formed in the circuit forming step, the current and voltage flowing through the output switch are detected, and the phase and magnitude of the inverse converter output voltage are adjusted by comparing with the test load and the test load power factor input by the user. A test load control step of controlling to be equal to a test load; and
The test load control step monitors the operation state of the power converter including the forward converter and the reverse converter for a preset test time while controlling the current amount of the output switch to be maintained in the same state as the set test load amount and test load power factor. A computer-readable recording medium recording a program for testing an energy saving load of a power converter, characterized in that the control unit of the power converter performs the test determination step of determining whether the test is normal.
In a computer-readable recording medium recording a program for load test of the power converter,
When the DC voltage source discharge test mode is selected in the operation mode judgment, after confirming the disconnection state between the power converter and the load side and receiving the test load amount and the test load power factor, the operation of the forward converter stops and the reverse converter is started. A discharge power phase synchronous control step of converting the discharge power of the DC voltage source from the reverse converter to the AC power and controlling the reverse converter to synchronize phases of the input voltage waveform and the output voltage waveform;
An output current and output voltage detection step of detecting current and voltage flowing through an output switch after the phases are synchronized in the discharge power phase synchronization control step;
A load amount and load power factor determination step of comparing and determining whether the output current detected in the output current and output voltage detection step is equal to a test load amount and a test load power factor set by a user;
A load amount and load power factor following control step of adjusting an output voltage phase and magnitude of the inverse converter so that an output current amount of an output switch is equal to a set test load amount and a test load power factor in the load amount and load power factor determination step;
In the load amount and load power factor following control step, the output current amount is controlled to be equal to the set test load amount and test load power factor, and the discharge is determined by monitoring the operating states of the reverse converter, the output switch and the bypass switch during the set test time. A computer-readable recording medium having recorded thereon a program for testing an energy saving load of a power converter, characterized in that the control unit of the power converter performs the test judgment step.
KR1020100083532A 2010-08-27 2010-08-27 Power converter, energy-saving load test method of power converter and computer-readable recording media including energy-saving load test function KR101001643B1 (en)

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PCT/KR2011/005588 WO2012026683A1 (en) 2010-08-27 2011-07-29 Power converter, energy-saving load test method for power converter, and computer-readable recording medium containing the method

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