KR20040040530A - Parallel control system of single-phase inverter - Google Patents

Parallel control system of single-phase inverter Download PDF

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KR20040040530A
KR20040040530A KR1020020068682A KR20020068682A KR20040040530A KR 20040040530 A KR20040040530 A KR 20040040530A KR 1020020068682 A KR1020020068682 A KR 1020020068682A KR 20020068682 A KR20020068682 A KR 20020068682A KR 20040040530 A KR20040040530 A KR 20040040530A
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inverter
current
control unit
parallel
parallel operation
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KR1020020068682A
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Korean (ko)
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KR100685444B1 (en
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류승표
신현주
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현대중공업 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

PURPOSE: A parallel control system of a single-phase inverter is provided to minimize the intensity of the circulating current by controlling the current applied to each inverter. CONSTITUTION: A parallel control system of a single-phase inverter includes a first and a second inverter system and a parallel operation control unit(300). The parallel operation control unit(300) includes a first and a second zero crossing circuit(305,310), a DPLL(320), a clock selection circuit(330), a timer(340), an effective power control unit(380), a reactive power controller(350), an output voltage control unit(360), a PWM generator(370), and an IGBT driver(390). The first and the second zero crossing circuits(305,310) are used for converting the first and the second current of the first and the second inverter systems to square waves. The DPLL(320) is used for determining output frequencies of the square waves. The clock selection circuit(330) is used for selecting clocks of the output frequencies. The timer(340) is used for performing a buffering operation to remove the circulation current. The effective power control unit(380) controls the effective power. The reactive power controller(350) controls the reactive power. The output voltage control unit(360) generates a voltage command value by controlling the voltages of the first and the second inverter systems. The PWM generator(370) is used for generating a control signal to operate a first and a second inverter IGBT. The IGBT driver(390) is used for transmitting control signals of the PWM generator to the first and the second inverter IGBTs.

Description

단상인버터의 병렬제어시스템{Parallel control system of single-phase inverter}Parallel control system of single-phase inverter

본 발명은 단상인버터의 병렬제어시스템에 관한 것으로서, 보다 상세하게는 용량증대 또는 신뢰성 향상을 위해 병렬로 운전되는 각 단상인버터에 흐르는 전류 분담을 동일하게 제어함으로써 각 단상인버터에 흐르는 순환전류를 최소화할 수 있도록 한 단상인버터의 병렬제어시스템에 관한 것이다.The present invention relates to a parallel control system of a single-phase inverter, and more particularly, to minimize the circulating current flowing through each single-phase inverter by controlling the current sharing flowing through each single-phase inverter operated in parallel to increase capacity or improve reliability. It relates to a parallel control system of a single-phase inverter.

일반적으로 인버터란 직류 전력을 교류 전력으로 변환하는 장치를 말하는 것으로, 종래의 인버터는 3개의 전압과 3개의 전류를 얻을 수 있는 삼상 시스템으로 구성되어 병렬 운전을 수행하기 위한 제어 방법들이 많다.In general, an inverter refers to a device for converting DC power into AC power, and a conventional inverter is composed of a three-phase system capable of obtaining three voltages and three currents, and thus there are many control methods for performing parallel operation.

종래의 삼상 인버터시스템에 있어서 병렬 운전을 제어하는 방법에는 3개의 전류를 좌표 변환하면 간단하게 유효전력과 무효전력을 얻을 수 있고, 병렬 운전시 얻어낸 유효전력과 무효전력을 이용하여 각 시스템의 전류분담 제어를 수행함으로써 용이하게 병렬 운전을 제어할 수 있다.In the conventional three-phase inverter system, the parallel operation control method can easily obtain the active power and the reactive power by converting three current coordinates, and share the current of each system by using the active power and the reactive power obtained in parallel operation. By performing the control, parallel operation can be easily controlled.

이러한 인버터의 병렬 제어는 출력단에서 검출된 전류와 자기 자신의 전류 편차를 검출회로를 통하여 유효전력 P와 무효전력 Q로 분리한다. 이때, 유효전력 P로 검출된 전류는 빠른 응답을 위하여 인버터의 출력주파수를 변화시키고, 무효전력 Q로 검출된 전류는 인버터의 전압 진폭을 제어한다.The parallel control of the inverter separates the current detected from the output stage and its own current deviation into active power P and reactive power Q through a detection circuit. At this time, the current detected by the active power P changes the output frequency of the inverter for quick response, and the current detected by the reactive power Q controls the voltage amplitude of the inverter.

도 1은 종래의 인버터시스템에서 유효전력 P의 검출부를 상세하게 나타낸 도면으로서, 유효전력 편차를 검출하는 블록도를 나타낸다.1 is a view showing in detail the detection portion of the active power P in the conventional inverter system, active power deviation Shows a block diagram for detecting.

도 1에 도시된 바와 같이, 제1 인버터(10)의 전류와 전압는 유효전력 검출기에 대한 입력이며, 인버터에 대한 유효전력는 다음과 같은 관계식에 의해서 구해진다.As shown in FIG. 1, the current of the first inverter 10 And voltage Is the input to the active power detector, and the active power to the inverter Is obtained by the following equation.

여기서,는와사이의 위상차이다.here, Is Wow Phase difference between.

마찬가지로, 제2 인버터(20)의 전류와 전압는 유효전력 검출기에 대한 입력이며, 인버터에 대한 유효전력는 다음과 같은 관계식에 의해서 구해진다.Similarly, the current of the second inverter 20 And voltage Is the input to the active power detector, and the active power to the inverter Is obtained by the following equation.

여기서,는와사이의 위상차이다.here, Is Wow Phase difference between.

상기한 바와 같은 관계식에 의해 구해진 유효전력및는 감산회로에 의해및를 생성한다. 이때,일 때는가 정(+)이 되고,는 부(-)가 된다. 그리고,일 때는가 부(-)가 되고,는 정(+)이 된다. 한편,일 때는이 된다.Active power obtained by the above relationship And By the subtraction circuit And Create At this time, When Becomes positive, Becomes negative. And, When Becomes negative, Becomes positive. Meanwhile, When Becomes

상술된 무효전력 Q에 대해서도 동일한 방법으로 제어된다. 따라서,,가 되도록 제어하여,이 되도록 함으로써 전류분담 특성을 얻을 수 있다.The reactive power Q described above is also controlled in the same manner. therefore, , To control , By doing so, current sharing characteristics can be obtained.

그러나, 단상인버터인 경우에는 그 출력이 단상임으로 병렬 운전시 종래의삼상 인버터를 제어하는 방법을 그대로 적용할 수 없는 단점이 있다.However, in the case of a single-phase inverter, since the output is single-phase, there is a disadvantage in that a conventional method of controlling a three-phase inverter during parallel operation cannot be applied as it is.

이에, 본 발명의 목적은 단상인버터를 용량 증대나 신뢰성 향상을 위해 병렬로 운전하는 경우 각 인버터에 흐르는 전류 분담을 동일하게 제어함으로써 각 인버터로 흐르는 순환전류의 크기를 최소화할 수 있도록 한 단상인버터의 병렬제어시스템을 제공하는데 있다.Accordingly, an object of the present invention is to provide a single phase inverter for minimizing the amount of circulating current flowing to each inverter when the single phase inverters are operated in parallel for increased capacity or improved reliability. To provide a parallel control system.

본 발명의 다른 목적은 디지털 기술을 사용함으로써 회로구성을 간단히 하고, 항상 안정된 특성을 가질 수 있도록 한 단상인버터의 병렬제어시스템을 제공하는데 있다.Another object of the present invention is to provide a parallel control system for a single-phase inverter that can simplify the circuit configuration and always have stable characteristics by using digital technology.

상기와 같은 목적을 달성하기 위하여 본 발명에 따른 단상인버터의 병렬제어시스템은, 입력 교류전원을 직류전원으로 변환하는 컨버터와, 상기 변환된 직류전원을 교류전원으로 변환하는 단상인버터로 구성되어 서로 병렬 운전을 수행하는 제1 및 제2 인버터시스템; 및 상기 제1 및 제2 인버터시스템 간의 출력전류의 위상과 크기를 비교하여 병렬 운전을 제어하는 병렬운전제어부가 구비된다.In order to achieve the above object, the parallel control system of a single phase inverter according to the present invention comprises a converter for converting an input AC power source into a DC power source, and a single phase inverter for converting the converted DC source power into an AC power source in parallel with each other. First and second inverter systems for performing operation; And a parallel operation control unit configured to control the parallel operation by comparing the phase and magnitude of the output current between the first and second inverter systems.

도 1은 종래의 인버터시스템에서 유효전력 P의 검출부를 상세하게 나타낸 도면.1 is a view showing in detail the detection of the active power P in the conventional inverter system.

도 2는 본 발명에 따른 인버터시스템을 설명하기 위한 도면.2 is a view for explaining an inverter system according to the present invention.

도 3은 본 발명에 따른 단상인버터의 병렬제어시스템을 상세하게 나타낸 도면.Figure 3 is a view showing in detail the parallel control system of a single-phase inverter according to the present invention.

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

100 : 제1 인버터시스템 120 : 제1 인버터100: first inverter system 120: first inverter

122 : 제1 인버터 IGBT 200 : 제2 인버터시스템122: first inverter IGBT 200: second inverter system

220 : 제2 인버터 222 : 제2 인버터 IGBT220: second inverter 222: second inverter IGBT

300 : 병렬운전제어부 305, 310 : 제1 및 제2 제로크로싱 회로300: parallel operation control unit 305, 310: first and second zero crossing circuit

320 : DPLL 330 : 클럭선택회로320: DPLL 330: clock selection circuit

340 : 타이머 350 : 무효전력제어기340: timer 350: reactive power controller

360 : 출력전압제어기 370 : PWM 발생기360: output voltage controller 370: PWM generator

380 : 유효전력제어기 390 : IGBT 드라이버380: active power controller 390: IGBT driver

400 : 부하단400: load stage

이하, 첨부된 도면을 참조하여 본 발명을 상세하게 설명하고자 한다.Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

도 2는 본 발명에 따른 인버터시스템을 설명하기 위한 도면이고, 도 3은 본 발명에 따른 단상인버터의 병렬제어시스템을 상세하게 나타낸 도면이다.2 is a view for explaining an inverter system according to the present invention, Figure 3 is a view showing in detail the parallel control system of a single-phase inverter according to the present invention.

이들 도면을 참조하여 설명하면, 본 발명에 따른 단상인버터의 병렬제어시스템은 도 2 및 도 3에 도시된 바와 같이 서로 병렬 운전을 수행하는 제1 인버터시스템(100) 및 제2 인버터시스템(200)과, 각각의 인버터시스템(100)(200) 간의 출력전류의 위상과 크기를 비교하여 병렬 운전을 제어하는 병렬운전제어부(300)로 구성된다.Referring to these drawings, the parallel control system of a single-phase inverter according to the present invention is the first inverter system 100 and the second inverter system 200 to perform parallel operation with each other as shown in Figs. And a parallel operation control unit 300 comparing the phase and magnitude of the output current between the respective inverter systems 100 and 200 to control the parallel operation.

상기 각각의 인버터시스템(100)(200)은 입력 교류전원을 직류전원으로 변환하는 컨버터(110)(210)와, 상기 변환된 직류전원을 교류전원으로 변환하는 인버터(120)(220)로 구성된다.Each of the inverter systems 100 and 200 includes a converter 110 and 210 for converting an input AC power into a DC power, and an inverter 120 and 220 for converting the converted DC power into AC power. do.

상기 컨버터(110)(210)는 IGBT(Insulated Gate Bipolar Transistor)를 이용한 PWM(Pulse Width Modulation; 펄스폭 변조) 컨버터 방식을 사용하여 입력측의 고조파 뿐만 아니라, 역률 제어도 수행한다.The converters 110 and 210 perform power factor control as well as harmonics on the input side using a pulse width modulation (PWM) converter using an insulated gate bipolar transistor (IGBT).

상기 인버터(120)(220)는 인버터 IGBT(122)(222)와, 변압기 및 콘덴서(도시되지 않음)로 구성된 단상인버터로 컨버터(110)(210)에서 발생된 PWM파를 필터링(Filtering)하여 부하단(400)에 정현파 출력전압을 공급한다. 이때, 상기 컨버터(110)(210)와 인버터(120)(220)를 이용한 병렬제어는 DSP(Digital Signal Processor)를 사용하여 고기능의 디지털 제어에 의하여 수행된다.The inverters 120 and 220 filter the PWM waves generated by the converters 110 and 210 by inverters IGBTs 122 and 222 and single phase inverters composed of transformers and capacitors (not shown). The sine wave output voltage is supplied to the load stage 400. At this time, the parallel control using the converters 110, 210 and the inverters 120, 220 is performed by digital control of a high function using a digital signal processor (DSP).

상술한 바와 같은 제1 및 제2 인버터시스템(100)(200)은 정상인 경우 병렬운전을 수행한다. 이때, 병렬운전을 수행하기 위해서 출력전압의 위상 뿐만 아니라 전압의 크기도 제어되어야 하는데, 상기 제1 및 제2 인버터시스템(100)(200)의 출력전압의 위상 및 크기는 도 3에 도시된 바와 같은 병렬운전제어부(300)에 의해 제어된다.As described above, the first and second inverter systems 100 and 200 perform parallel operation when they are normal. In this case, in order to perform the parallel operation, not only the phase of the output voltage but also the magnitude of the voltage must be controlled. The phase and magnitude of the output voltage of the first and second inverter systems 100 and 200 are shown in FIG. 3. It is controlled by the same parallel operation control unit 300.

상기 병렬운전제어부(300)는 위상제어를 위해 상기 각각의인버터시스템(100)(200)의 출력전류및의 위상과 크기를 비교하여 제어를 수행한다.The parallel operation control unit 300 output current of each inverter system 100, 200 for phase control And Control is performed by comparing the phase and magnitude of.

상기 병렬운전제어부(300)는 도 3에 도시된 바와 같이, 제1 및 제2 인버터시스템(100)(200)의 제1 및 제2 출력전류및를 구형파로 변환하는 제1 및 제2 제로크로싱 회로(305)(310)와, 상기 제1 및 제2 제로크로싱 회로(305)(310)를 통해 변환된 구형파의 출력주파수를 결정하는 DPLL(Digital Phase Lock Loop)(320)과, 상기 하나의 인버터시스템의 전류가 항상 다른 인버터시스템의 전류를 추종하도록 출력주파수의 클럭(Clock)을 선택하는 클럭선택회로(330)와, 상기 하나의 인버터시스템의 고장 또는 하나의 인버터시스템의 동작중 다른 인버터시스템의 투입시 순환전류를 제거하는 완충작용을 수행하는 타이머(340)와, 상기 클럭선택회로(330) 및 타이머(340)를 통해 발생된 클럭에 의해 유효전력을 제어하는 유효전력제어기(380)와, 상기 제1 및 제2 인버터시스템(100)(200)의 제1 및 제2 출력전류및의 차에 의해 무효전력을 제어하는 무효전력제어기(350)와, 상기 제1 및 제2 인버터시스템(100)(200)의 전압을 조정하여 전압 지령치를 생성하는 출력전압제어기(360)와, 상기 유효전력제어기(380), 무효전력제어기(350) 및 출력전압제어기(360)에서 발생된 신호를 조합하여 실제 제1 및 제2 인버터 IGBT(122)(222)를 동작시킬 수 있는 제어신호를 발생하는 PWM 발생기(370)와, 상기 PWM 발생기(370)에서 발생된 제어신호를 제1 및 제2 인버터 IGBT(122)(222)에 전달하여 구동시키는 IGBT 드라이버(Driver)(390)로 구성된다.As shown in FIG. 3, the parallel operation control unit 300 includes first and second output currents of the first and second inverter systems 100 and 200. And First and second zero crossing circuits 305 and 310 for converting a square wave into a square wave, and a DPLL (Digital) for determining an output frequency of the square wave converted through the first and second zero crossing circuits 305 and 310. Phase lock loop) 320, a clock selection circuit 330 for selecting a clock of an output frequency so that the current of the one inverter system always follows the current of the other inverter system, and a clock selection circuit 330 of the one inverter system. By a timer 340 which performs a buffering function for removing a circulating current when a fault or an operation of one inverter system is turned on, and a clock generated by the clock selection circuit 330 and the timer 340. An active power controller 380 for controlling active power, and first and second output currents of the first and second inverter systems 100 and 200; And A reactive power controller 350 for controlling reactive power by the difference of the difference, an output voltage controller 360 for adjusting a voltage of the first and second inverter systems 100 and 200 to generate a voltage command value, and Combining signals generated from the active power controller 380, the reactive power controller 350, and the output voltage controller 360 to generate a control signal that can actually operate the first and second inverters IGBTs 122 and 222. The PWM generator 370 and the IGBT driver 390 which transfers and drives the control signals generated by the PWM generator 370 to the first and second inverters IGBT 122 and 222.

상기와 같은 구성으로 이루어진 단상인버터의 병렬제어시스템의 작용 및 효과를 첨부된 도면을 참조하여 설명하면 다음과 같다.Referring to the accompanying drawings, the operation and effects of the parallel control system of the single-phase inverter having the above configuration are as follows.

먼저, 제1 및 제2 인버터시스템(100)(200)의 병렬 운전이 동작되면 제1 인버터시스템(100)에서 발생된 전류와, 제2 인버터시스템(200)에서 발생된 전류는 병렬운전제어부(300)로 입력된다.First, when parallel operation of the first and second inverter systems 100 and 200 is operated, a current generated in the first inverter system 100 And, the current generated in the second inverter system 200 Is input to the parallel operation control unit 300.

상기 병렬운전제어부(300)에 입력된 전류는 제1 제로크로싱 회로(305)에서, 입력된 전류는 제2 제로크로싱 회로(310)에서 각각 구형파로 변환된다.Current input to the parallel operation control unit 300 In the first zero crossing circuit 305, the input current Are respectively converted into square waves in the second zero crossing circuit 310.

상기 제1 및 제2 제로크로싱 회로(305)(310)를 통해 변환된 구형파는 DPLL(320)를 통과함으로써 출력주파수가 결정된다. 상기 DPLL(320)은 프로그램(Program)에 의한 소프트웨어로 수행되는데, 단지 제1 및 제2 인버터시스템(100)(200)이 병렬 운전을 시작할 경우에만 수행되고, 어느 한 쪽이 고장이 나서 하나의 인버터시스템만 동작하면 DPLL(320)도 동작하지 않는다. 만약, 하나의 인버터시스템만 동작하면 DPLL(320)은 기본파 클럭(Clock)에서 발생된 주파수를 추종한다.The square wave converted by the first and second zero crossing circuits 305 and 310 passes through the DPLL 320 to determine an output frequency. The DPLL 320 is performed by software by a program, and is performed only when the first and second inverter systems 100 and 200 start parallel operation, and either one fails and one If only the inverter system operates, the DPLL 320 also does not operate. If only one inverter system operates, the DPLL 320 follows the frequency generated from the fundamental wave clock.

상기 DPLL(320)에서 결정된 출력주파수의 클럭은 클럭선택회로(330)에서 선택된다.The clock of the output frequency determined by the DPLL 320 is selected by the clock select circuit 330.

그러나, 하나의 인버터시스템의 고장 또는 하나의 인버터시스템이 동작중 다른 인버터시스템이 투입되는 경우, 타이머(40)에서 완충작용을 수행함으로써 순환전류가 제거된다. 이때, 발생된 클럭은 유효전력제어기(380)에 입력됨으로써 유효전력을 제어한다.However, when one inverter system malfunctions or another inverter system is put into operation while the inverter system is in operation, the circulating current is eliminated by performing a buffering action in the timer 40. At this time, the generated clock is input to the active power controller 380 to control the active power.

한편, 무효전력제어기(350)는 제1 및 제2 인버터시스템(100)(200)으로부터 출력된 전류및의 차에 의해 무효전력을 제어한다.On the other hand, the reactive power controller 350 is a current output from the first and second inverter system (100, 200) And The reactive power is controlled by the difference of.

그리고, 출력전압제어기(360)는 인버터시스템의 전류의 크기가 큰 경우에는 전압을 줄이는 방향으로, 인버터시스템의 전류가 적은 경우에는 전압을 키우는 방향으로 동작을 수행하여 인버터시스템(100)(200)의 전압을 조정한다. 이때, 인버터시스템(100)(200)의 기준전압은 Vref를 추종하고, Vin은 실제로 인버터시스템(100)(200)에 발생된 전압인데, 출력전압제어기(360)는 Vref 전압과 실제의 전압 Vin을 비교하여 전압 지령치를 생성한다.In addition, the output voltage controller 360 operates in a direction of decreasing the voltage when the current of the inverter system is large and increases the voltage when the current of the inverter system is small, thereby increasing the voltage of the inverter system 100 (200). Adjust the voltage. At this time, the reference voltage of the inverter system 100, 200 follows Vref, and Vin is actually the voltage generated in the inverter system 100, 200, and the output voltage controller 360 is the Vref voltage and the actual voltage Vin. Comparing to generate a voltage setpoint.

상기 유효전력제어기(380), 무효전력제어기(350) 및 출력전압제어기(360)에서 발생된 신호는 각각 PWM 발생기(370)에 입력된다.The signals generated by the active power controller 380, the reactive power controller 350, and the output voltage controller 360 are input to the PWM generator 370, respectively.

상기 PWM 발생기(370)는 입력된 유효전력제어기(380), 무효전력제어기(350) 및 출력전압제어기(360)에서 발생된 신호를 조합하여 실제로 제1 및 제2 인버터 IGBT(122)(222)를 동작시킬 수 있는 최종 제어신호를 생성하여 IGBT 드라이버(390)에 출력한다.The PWM generator 370 combines the signals generated by the input active power controller 380, the reactive power controller 350, and the output voltage controller 360 to actually use the first and second inverters IGBTs 122 and 222. Generates a final control signal capable of operating and outputs it to the IGBT driver 390.

상기 IGBT 드라이버(390)는 입력된 제어신호를 인버터시스템(100)(200)의 제1 및 제2 인버터 IGBT(122)(222)에 전달하여 이들을 동작시킴으로써 두 인버터시스템(100)(200) 간의 병렬 운전을 제어한다. 이때, 이들 간의 병렬 제어는 DSP(Digital Signal Processor)를 이용하여 고기능의 디지털로 이루어진다.The IGBT driver 390 transmits the input control signals to the first and second inverters IGBT 122 and 222 of the inverter system 100 and 200 to operate them, thereby operating the two inverter systems 100 and 200. Control parallel operation. At this time, the parallel control between them is made of digital with high functionality using a digital signal processor (DSP).

따라서, 본 발명에 따른 단상인버터의 병렬제어시스템은 부하단(400)에 흐르는 전력을 무효전력과 유효전력으로 구별되도록 각각의 인버터시스템(100)(200)의 출력전류를 제로크로싱하여 한 쪽의 전류가 항상 다른 쪽의 전류를 추종하도록 함으로써 유효전력과 무효전력의 제어가 가능하고, 각 인버터시스템(100)(200)에서 발생된 전류가 모두 부하단(400)으로 흐르게 하여 순환전류를 최소화할 수 있다.Therefore, the parallel control system of the single-phase inverter according to the present invention by zero-crossing the output current of each inverter system 100, 200 so that the power flowing through the load stage 400 is divided into reactive power and active power By controlling the current to always follow the other side, it is possible to control the active power and the reactive power, and to minimize the circulating current by allowing the current generated in each inverter system 100, 200 to flow to the load stage 400. Can be.

이상에서 설명한 것은 본 발명에 따른 단상인버터의 병렬제어시스템에 대한 하나의 실시예에 불과한 것으로서, 본 발명이 속하는 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변경 실시가 가능한 범위까지 본 발명의 기술적 정신이 있다고 할 것이다.What has been described above is only one embodiment of a parallel control system of a single-phase inverter according to the present invention, anyone skilled in the art to which the present invention belongs to the technical scope of the present invention can be variously modified It will be said to have a spirit.

이상에서 살펴본 바와 같이, 본 발명에 따른 단상인버터의 병렬제어시스템은 다음과 같은 효과가 있다.As described above, the parallel control system of the single-phase inverter according to the present invention has the following effects.

첫째, 단상인버터를 병렬 운전하는 경우 각 인버터시스템의 출력전류를 제로크로싱하여 한 쪽의 전류가 항상 다른 쪽의 전류를 추종하도록 함으로써 각 인버터시스템에 흐르는 전류 분담을 동일하게 제어하여 각 인버터로 흐르는 순환전류의 크기를 최소화시킬 수 있는 잇점이 있다.First, when single-phase inverters are operated in parallel, the output current of each inverter system is zero-crossed so that one current always follows the other, so that the current sharing flowing through each inverter system is controlled equally and the circulation flows to each inverter. This has the advantage of minimizing the magnitude of the current.

둘째, DSP를 이용하여 디지털 병렬 제어를 수행함으로써 회로구성을 간단히 하고, 항상 안정된 회로특성을 갖도록 하는 효과가 있다.Second, there is an effect of simplifying the circuit configuration and always having stable circuit characteristics by performing digital parallel control using the DSP.

Claims (3)

입력 교류전원을 직류전원으로 변환하는 컨버터와, 상기 변환된 직류전원을 교류전원으로 변환하는 단상인버터로 구성되어 서로 병렬 운전을 수행하는 제1 및 제2 인버터시스템; 및First and second inverter systems configured to convert an input AC power source into a DC power source and a single phase inverter converting the converted DC power source into an AC power source to perform parallel operation with each other; And 상기 제1 및 제2 인버터시스템 간의 출력전류의 위상과 크기를 비교하여 병렬 운전을 제어하는 병렬운전제어부가 구비됨을 특징으로 하는 단상인버터의 병렬제어시스템.And a parallel operation control unit for controlling parallel operation by comparing the phase and magnitude of the output current between the first and second inverter systems. 청구항 1에 있어서, 상기 병렬운전제어부는,The method according to claim 1, wherein the parallel operation control unit, 제1 및 제2 인버터시스템의 제1 및 제2 출력전류를 구형파로 변환하는 제1 및 제2 제로크로싱 회로와,First and second zero crossing circuits for converting first and second output currents of the first and second inverter systems into square waves, 상기 제1 및 제2 제로크로싱 회로를 통해 변환된 구형파의 출력주파수를 결정하는 DPLL(Digital Phase Lock Loop)과,A digital phase lock loop (DPLL) for determining an output frequency of the square wave converted through the first and second zero crossing circuits; 상기 하나의 인버터시스템의 전류가 항상 다른 인버터시스템의 전류를 추종하도록 출력주파수의 클럭(Clock)을 선택하는 클럭선택회로와,A clock selection circuit for selecting a clock of an output frequency such that a current of the one inverter system always follows a current of another inverter system; 상기 하나의 인버터시스템의 고장 또는 하나의 인버터시스템의 동작중 다른 인버터시스템의 투입시 순환전류를 제거하는 완충작용을 수행하는 타이머와,A timer for performing a buffering operation to remove the circulating current when the one inverter system fails or the other inverter system is turned on during operation of the inverter system; 상기 클럭선택회로 및 타이머를 통해 발생된 클럭에 의해 유효전력을 제어하는 유효전력제어기와,An active power controller controlling active power by a clock generated through the clock selection circuit and a timer; 상기 제1 및 제2 인버터시스템의 제1 및 제2 출력전류의 차에 의해 무효전력을 제어하는 무효전력제어기와,A reactive power controller for controlling reactive power by a difference between first and second output currents of the first and second inverter systems; 상기 제1 및 제2 인버터시스템의 전압을 조정하여 전압 지령치를 생성하는 출력전압제어기와,An output voltage controller for adjusting a voltage of the first and second inverter systems to generate a voltage command value; 상기 유효전력제어기, 무효전력제어기, 출력전압제어기에서 발생된 신호를 조합하여 실제 제1 및 제2 인버터 IGBT를 동작시킬 수 있는 제어신호를 발생하는 PWM 발생기와,A PWM generator for generating a control signal capable of operating the first and second inverters IGBTs by combining signals generated from the active power controller, reactive power controller, and output voltage controller; 상기 PWM 발생기에서 발생된 제어신호를 제1 및 제2 인버터 IGBT에 전달하여 구동시키는 IGBT 드라이버(Driver)가 구비됨을 특징으로 하는 단상인버터의 병렬제어시스템.Parallel control system of a single-phase inverter, characterized in that the IGBT driver (Driver) for transmitting and driving the control signal generated by the PWM generator to the first and second inverter IGBT. 청구항 1에 있어서, 상기 제1 및 제2 인버터시스템과 병렬운전제어부는,The method according to claim 1, wherein the first and second inverter system and the parallel operation control unit, 병렬 운전을 제어하는 과정에서 DSP(Digital Signal Processor)를 사용하여 고기능의 디지털 제어를 수행함을 특징으로 하는 단상인버터의 병렬제어시스템.A parallel control system for a single-phase inverter, characterized in that the digital signal processor (DSP) is used to control the parallel operation.
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CN102842918A (en) * 2012-06-11 2012-12-26 乐金电子研发中心(上海)有限公司 Current grid-connected method and device utilizing digital phase-locked loop and phase compensation
CN112909974A (en) * 2021-02-02 2021-06-04 台州宏远电力设计院有限公司 Composite energy storage and reactive compensation integrated system
KR20230040003A (en) * 2021-09-15 2023-03-22 전남대학교산학협력단 Single-phase independent inverter with cooperative control structure of two sets of parallel inverters for voltage stabilization

Family Cites Families (1)

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Publication number Priority date Publication date Assignee Title
KR100209311B1 (en) * 1996-12-19 1999-07-15 오상수 The control device of inverter for motor driving

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KR100689326B1 (en) * 2005-11-18 2007-03-08 엘에스산전 주식회사 Dc power supply apparatus and method
CN102842918A (en) * 2012-06-11 2012-12-26 乐金电子研发中心(上海)有限公司 Current grid-connected method and device utilizing digital phase-locked loop and phase compensation
CN112909974A (en) * 2021-02-02 2021-06-04 台州宏远电力设计院有限公司 Composite energy storage and reactive compensation integrated system
KR20230040003A (en) * 2021-09-15 2023-03-22 전남대학교산학협력단 Single-phase independent inverter with cooperative control structure of two sets of parallel inverters for voltage stabilization

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