KR20040041183A - Method for regulating converter out voltage by using pulse counter of dynamic break unit - Google Patents

Method for regulating converter out voltage by using pulse counter of dynamic break unit Download PDF

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Publication number
KR20040041183A
KR20040041183A KR1020020069010A KR20020069010A KR20040041183A KR 20040041183 A KR20040041183 A KR 20040041183A KR 1020020069010 A KR1020020069010 A KR 1020020069010A KR 20020069010 A KR20020069010 A KR 20020069010A KR 20040041183 A KR20040041183 A KR 20040041183A
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South Korea
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regenerative braking
converter
counter
unit
units
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KR1020020069010A
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Korean (ko)
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KR100899698B1 (en
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권성팔
김광호
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주식회사 포스코
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/08—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor
    • H02P3/14—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor by regenerative braking

Abstract

PURPOSE: A method for stabilizing an output voltage of a converter using a pulse counter of a regenerative braking unit is provided to easily monitor a state of the regenerative braking unit by counting accurately the operation number of the regenerative braking unit. CONSTITUTION: Current signals are detected from resistors(4a,4b) when an output voltage of a converter(1) exceeds a predetermined level and the first and the second regenerative braking units(2,3) are operated thereby. The detected current signals are amplified and converted to digital signals. The current signals are standardized by a counting process. The operation number of the first and the second regenerative braking units(2,3) is displayed on a counter display unit(10) through a sequential display control circuit. An error detection mode is selected by a dip switch. A CPU decides each trouble state of the first and the second regenerative braking units by comparing the count values of the first and the second regenerative braking units.

Description

회생제동유니트의 펄스카운터를 이용한 컨버터 출력전압 안정화 방법{METHOD FOR REGULATING CONVERTER OUT VOLTAGE BY USING PULSE COUNTER OF DYNAMIC BREAK UNIT}Converter output voltage stabilization method using regenerative braking unit pulse counter {METHOD FOR REGULATING CONVERTER OUT VOLTAGE BY USING PULSE COUNTER OF DYNAMIC BREAK UNIT}

본 발명은 다이오드소자를 이용한 컨버터의 경우 다이오드소자의 특성상 부하측의 전력을 입력전원 라인측으로 회생제어를 할 수가 없으므로 회생제동유니트를 이용하여 스위칭 제어하여 디시링크(DC LINK) 전압 상승분을 저항기를 통해 소모시킴으로써 디시링크 전압을 일정하게 유지 및 제어할 수 있도록 한 회생제동유니트의 펄스카운터를 이용한 컨버터 출력전압 안정화 방법에 관한 것이다.In the case of the converter using the diode element, the regenerative control of the load side power to the input power line side cannot be performed due to the characteristics of the diode element, so that the switching control using the regenerative braking unit consumes the DC link voltage rise through the resistor. The present invention relates to a method of stabilizing a converter output voltage using a pulse counter of a regenerative braking unit that can maintain and control a decilink voltage.

종래에는 도 1의 도시와 같이, 컨버터부(1)에서 출력되는 전압을 벡터모터제어반(5)과 주파수제어 모터제어반(6)에 디시링크(DC LINK) 전원으로 공급하게 되며, 회생제동유니트1,2(2,3)는 상기 디시링크 전압을 일정하게 제어하기 위해 정격전압의 130%이상일 때 그 레벨을 검출하여 회생제동유니트1,2(2,3) 내부의 사이리스터(THYRISTOR)의 게이트를 스위칭하여 저항기(4a,b)에서 소모되도록 제어하게 된다.Conventionally, as shown in FIG. 1, a voltage output from the converter unit 1 is supplied to a vector motor control panel 5 and a frequency control motor control panel 6 by using a DC LINK power supply, and a regenerative braking unit 1 2 (2,3) detects the level of the thyristor in the regenerative braking units 1, 2 (2, 3) when it is 130% or more of the rated voltage in order to control the dish link voltage constantly. The switching is controlled to be consumed by the resistors 4a and b.

그런데, 상기 회생제동유니트1,2(2,3)가 고장나 작동되지 않을 경우에는 디스링크의 전압이 계속하여 상승하게 되고 140% 이상이 되게 되면 과전압검출로 상기 디시링크 전압을 사용하는 벡터모터제어반(5) 및 주파수제어 모터제어반(6)의 드라이버 패널이 트립(TRIP)되게 되는데 이러한 과정에서 회생제동유니트1,2(2,3)의 이상유무를 판단할 수 있는 기능이 없기 때문에 조업중 부하의 변동상황을 파악할 수 없음은 물론 그 원인조차 규명할 수 없어 이를 수정하기 위한 작업지연이 가중되게 된다.However, when the regenerative braking units 1, 2 (2, 3) are broken or inoperable, the voltage of the dislink continues to rise and becomes 140% or more. The driver panel of the control panel 5 and the frequency control motor control panel 6 is tripped, and in this process there is no function to determine the abnormality of the regenerative braking units 1, 2 (2, 3). Not only can the load fluctuate, but the cause can not be identified, and the delay for correcting the load is increased.

특히, 상기 드라이버 패널의 트립에 의해 폴공정중 산세처리(7)가 중단되게 되어 제품에 롤마크나 녹무늬를 형성시켜 제품불량을 초래함은 물론 이로 인한 급격한 생산성 저하를 불러 일으키게 된다.In particular, the pickling process 7 is interrupted during the pole process by the trip of the driver panel, thereby forming a roll mark or a rust pattern on the product, causing product defects and causing a sudden decrease in productivity.

본 발명은 상술한 바와 같은 종래 기술이 갖는 제반 문제점을 감안하여 이를해결하고자 창출한 것으로, 회생제동유니트 자체에 이들 양자의 작동횟수를 카운트하여 비교할 수 있는 카운터를 부설함으로써 조업중 발생되는 오차의 범위 값 이상을 초과하였을 경우 회생제동유니터의 고장임을 판단하고 신속히 조처하여 과부하에 의한 드라이버 패널의 트립을 방지함음 물론 산세라인의 중단을 방지하여 고품위의 제품 생산에 일조할 수 있도록 한 회생제동유니트의 펄스카운터를 이용한 컨버터 출력전압 안정화 방법을 제공함에 그 목적이 있다.The present invention has been made in view of the above-described problems of the prior art, and has been created to solve the problem. If it exceeds the value, it is determined that the regenerative braking unit is faulty, and it is promptly taken to prevent the driver panel from tripping due to overload and of course, to prevent the interruption of pickling lines and to contribute to the production of high quality products. The purpose of the present invention is to provide a converter output voltage stabilization method using a pulse counter.

도 1은 종래 컨번터와 회생제동유니트의 구성도,1 is a configuration diagram of a conventional converter and a regenerative braking unit,

도 2는 본 발명을 설명하기 위한 컨버터와 회생제동유니트의 구성도,2 is a configuration diagram of a converter and a regenerative braking unit for explaining the present invention;

도 3은 도 2를 설명하기 위한 카운터를 위한 부분 회로도,3 is a partial circuit diagram for a counter for explaining FIG. 2;

도 4는 본 발명 안정화 방법의 플로우챠트.4 is a flow chart of the stabilization method of the present invention.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1....컨버터 2,3....회생제동유니트Converter 2, 3. Regenerative braking unit

4a,b....저항기 9....전류파형4a, b ... resistor 9 .... current waveform

10....카운터표시기10 .... counter indicator

본 발명의 상기한 목적은, 컨버터의 출력전압이 일정레벨을 초과하여 회생제동유니트1,2가 스위치동작하게 될 때 저항기로 흐르는 전류를 션트를 이용하여 전류신호를 검출하는 과정과; 검출된 전류신호를 카운트하기에 용이하도록 증폭하고 디지털로 변환한 후 연속된 다수의 스위칭에 의한 전류신호를 한번의 카운트로 규격화하는 과정과; 회생제동유니트1,2의 동작회수를 카운트하여 순차표시제어회로를 통해 카운터표시기에 동작회수를 표시하는 과정과; 딥스위치의 선택에 의해 고장검출모드로 절환시킨 후 회생제동유니트1,2의 각 중앙처리장치간의 인터페이스를 통한 카운트값의 상호비교를 거쳐 그 오차의 누적이 일정치 이상을 넘어서게 되면 회생제동유니트1,2의 고장으로 판단함과 동시에 카운터표시기를 자동으로 리셋시키는 과정을 포함하여 구성되는 것을 특징으로 하는 회생제동유니트의 펄스카운터를 이용한 컨버터 출력전압 안정화 방법을 제공함에 그 목적이 있다.The above object of the present invention comprises the steps of: detecting a current signal using a shunt for the current flowing through the resistor when the regenerative braking units 1 and 2 are switched when the output voltage of the converter exceeds a predetermined level; Amplifying and digitally converting the detected current signal to be easy to count, and then normalizing the current signal by a plurality of consecutive switching to a single count; Counting the number of operations of the regenerative braking units 1 and 2 and displaying the number of operations on the counter indicator through the sequential display control circuit; After switching to the fault detection mode by the selection of the dip switch, after the comparison of the count values through the interface between the regenerative braking units 1,2, the regenerative braking unit 1 when the accumulation of the error exceeds a certain value. It is an object of the present invention to provide a converter output voltage stabilization method using a pulse counter of a regenerative braking unit, which comprises a step of automatically determining a fault of 2 and automatically resetting a counter indicator.

이하에서는, 첨부도면을 참고하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 방법 설명을 위해 구성된 회로관계를 보인 도면으로서, 회생제동유니트1,2(2,3)와 저항기(4a,b)를 연결하는 부위에 션트(SHUNT)(8a,b)를 연결하고, 상기 션트(8a,b)로부터 인출된 라인으로부터 발생되는 회생제동유니트1,2(2,3)의 각 전류파형(9)을 구하되 이들이 각각 카운터표시기(10)가 부설된 PCB(11a,b)를 경유하여 전류파형(9)의 정해진 카운터 횟수가 다를 경우 이를 인식하여 고장유무를 판단할 수 있도록 구성한 것이다.FIG. 2 is a diagram illustrating a circuit relationship for explaining a method according to the present invention, in which a shunt (SHUNT) 8a, b is connected to a portion connecting the regenerative braking units 1, 2 (2, 3) and resistors 4a, b. ), And obtain the current waveforms 9 of the regenerative braking units 1, 2 (2, 3) generated from the lines drawn from the shunts 8a, b, respectively. If the predetermined number of counters of the current waveform (9) is different via the PCB (11a, b) is configured to determine whether there is a failure.

본 발명에 따른 카운터용 회로구성은 공지된 것으로 상세한 설명을 생략하고 도 3으로 대용한다.The circuit configuration for the counter according to the present invention is well known and the detailed description is omitted and is substituted in FIG.

도 2 내지 도 4를 참조하여 본 발명을 안정화 방법에 대하여 설명하면 다음과 같다.Referring to Figures 2 to 4 with reference to the stabilization method of the present invention.

먼저, 컨버터(1)의 출력전압이 일정레벨을 초과하여 회생제동유니트1,2(2,3)가 스위칭 동작하게 될 때 저항기(4a,b)로 전류가 흐르는 것을 션트(8a,b)를 이용하여 전류신호(9)를 검출하게 된다.First, when the regenerative braking units 1, 2 (2, 3) are switched and the output voltage of the converter 1 exceeds a predetermined level, the shunt 8a, b is turned off. To detect the current signal 9.

이때, 검출된 전류는 도 3과 같이, 입력증폭회로(12)에서 증폭되고 아날로그/디지털변환회로를 거쳐 중앙처리장치(13)에서 규격화된 후 카운터표시기(10)를 통해 그 카운터된 회수가 표시되게 된다.At this time, the detected current is amplified by the input amplification circuit 12, normalized by the central processing unit 13 via an analog / digital conversion circuit as shown in FIG. 3, and the counter counted by the counter indicator 10 is displayed. Will be.

이와 같은 과정에서 펄스의 규격화를 위해 도 2의 전류파형(9)과 같이 약 2.8sec 동안 22번의 연속적인 스위칭 동작을 한번의 동작으로 카운트되도록 동작시점의 펄스 전압레벨이 수미리볼트 이상 발생한 시점에서 정상조업중에 발생하는 회생제동유니트의 가장 긴 동작시간과 짧은 동작주기를 산점도로 분석하여 구한 일정시간을 불감대로 설정하여 중앙처리장치(13)의 프로그램으로 규격화하게 된다.In this process, as shown in the current waveform 9 of FIG. 2, when the pulse voltage level at the time of operation occurs several millivolts or more, 22 consecutive switching operations are counted as one operation for about 2.8 sec. The longest operating time and shortest operating period of the regenerative braking unit that occur during normal operation are analyzed by scatterplot, and the predetermined time period is set as deadband and standardized by the program of the central processing unit 13.

이러한 규격화를 통하여 한번으로 카운트되면 풀업회로(14)를 거쳐 순차표시제어회로(15)를 통해 카운터표시기(10)에 카운터한 회수인 '0001'을 표시하게 된다.When counted once through this standardization, the number of times that the counter is counted on the counter indicator 10 is displayed through the pull-up circuit 14 through the sequential display control circuit 15.

또한, 카운터될 때마다 가산 카운트방식으로 '9999'까지 표시가 가능하며 딥스위치(16)의 선택에 의해 고장검출모드로 절환되어 정밀측정학적인 측면에서 통상 발생되는 오차의 누적이 고장검출레벨과 비슷해지는 100여회의 범위내에서 회생제동유니트1,2(2,3)는 자동리세쇠고 '0000'부터 다시 카운트되게 된다.In addition, it is possible to display up to '9999' by the addition count method whenever it is countered, and it is switched to the fault detection mode by the selection of the dip switch 16, so that the accumulation of the error that is normally generated in terms of precision measurement is related to the fault detection level. The regenerative braking units 1, 2 (2, 3) are automatically reset and counted again from '0000' within the range of approximately 100 times.

리셋스위치(17)로 리셋하게 되면 우선적으로 카운터표시기(10)의 값은 '0000'으로 되게 된다.When the reset switch 17 is reset, the value of the counter indicator 10 becomes '0000' first.

아울러, 회생제동유니트의 동작상태를 감시하기 위한 고장 검출방법은 회생제동유니트1,2(2,3) 가운데 어느 하나가 고장으로 인해 동작하지 않게 되면 이를 검출하기 위해 중앙처리장치(13)의 인터페이스부(18)를 이용하여 회생제동유니트1(2)의 중앙처리장치(13a)와 회생제동유니트2(3)의 중앙처리장치(13b) 간의 동작회수 카운트정보를 공유하여 이 값을 상호 비교함으로써 카운트값의 오차가 정밀측정학적인 측면에서 정상적인 조업중 일정기간 동안 발생할 수 있는 통상의 오차발생인 수회 이상일 경우 이를 회생제동유니트의 고장으로 판단하고 출력하는 기능을 제공하게 된다.In addition, the failure detection method for monitoring the operation state of the regenerative braking unit is the interface of the central processing unit 13 to detect if any one of the regenerative braking units 1, 2 (2, 3) does not operate due to a failure By using the unit 18, the operation count count information is shared between the central processing unit 13a of the regenerative braking unit 1 (2) and the central processing unit 13b of the regenerative braking unit 2 (3), and the values are compared with each other. If the error of count value is more than several times, which is normal error that can occur for a certain period of time during normal operation in terms of precision measurement, it is provided as a function of determining and outputting the failure of the regenerative braking unit.

이상에서와 같이, 회생제동유니트의 동작회수를 자동검출하는 것에 의해 회생제동유니트의 고장을 자동으로 검출하여 표시할 수 있으며, 이를 통한 부하의 변동상황파악과 고장검출 및 회생제동유니트의 상태를 용이하게 감시할 수 있게 된다.As described above, by automatically detecting the number of operation of the regenerative braking unit, it is possible to automatically detect and display the failure of the regenerative braking unit. Can be monitored.

상술한 제어과정은 도 4의 플로우챠트에 상세히 도시되어 있으며, 그에 대한 설명은 도 2,3을 통하여 전술하였으므로 생략하기로 한다.The above-described control process is shown in detail in the flowchart of FIG. 4, and a description thereof will be omitted since it has been described above with reference to FIGS. 2 and 3.

상술한 바와 같이, 본 발명은 다이오드 정류방식의 컨버터에서 회생제동유니트의 회수를 정확하게 카운트함으로써 회생제동유니트가 정상적인 동작을 하고 있는지의 여부를 용이하게 감시할 수 있으며, 이로 인해 신속한 조치가 가능하여 설비관리에 있어 효용성이 제고된다.As described above, the present invention can easily monitor whether or not the regenerative braking unit is operating normally by accurately counting the number of regenerative braking units in the diode rectifier converter, which enables quick measures. The utility is enhanced in management.

Claims (1)

컨버터의 출력전압이 일정레벨을 초과하여 회생제동유니트1,2가 스위치동작하게 될 때 저항기로 흐르는 전류를 션트를 이용하여 전류신호를 검출하는 과정과;Detecting a current signal using a shunt for the current flowing through the resistor when the regenerative braking units 1 and 2 are switched by the output voltage of the converter exceeding a predetermined level; 검출된 전류신호를 카운트하기에 용이하도록 증폭하고 디지털로 변환한 후 연속된 다수의 스위칭에 의한 전류신호를 한번의 카운트로 규격화하는 과정과;Amplifying and digitally converting the detected current signal to be easy to count, and then normalizing the current signal by a plurality of consecutive switching to a single count; 회생제동유니트1,2의 동작회수를 카운트하여 순차표시제어회로를 통해 카운터표시기에 동작회수를 표시하는 과정과;Counting the number of operations of the regenerative braking units 1 and 2 and displaying the number of operations on the counter indicator through the sequential display control circuit; 딥스위치의 선택에 의해 고장검출모드로 절환시킨 후 회생제동유니트1,2의 각 중앙처리장치간의 인터페이스를 통한 카운트값의 상호비교를 거쳐 그 오차의 누적이 일정치 이상을 넘어서게 되면 회생제동유니트1,2의 고장으로 판단함과 동시에 카운터표시기를 자동으로 리셋시키는 과정을 포함하여 구성되는 것을 특징으로 하는 회생제동유니트의 펄스카운터를 이용한 컨버터 출력전압 안정화 방법.After switching to the fault detection mode by the selection of the dip switch, after the comparison of the count values through the interface between the regenerative braking units 1,2, the regenerative braking unit 1 when the accumulation of the error exceeds a certain value. And determining the failure of 2 and simultaneously resetting the counter indicator. A method of stabilizing a converter output voltage using a pulse counter of a regenerative braking unit, comprising: resetting the counter indicator.
KR1020020069010A 2002-11-08 2002-11-08 Method for regulating converter out voltage by using pulse counter of dynamic break unit KR100899698B1 (en)

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