WO2014038861A1 - System and apparatus for grid-connected inverter current control using odd harmonics elimination - Google Patents

System and apparatus for grid-connected inverter current control using odd harmonics elimination Download PDF

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Publication number
WO2014038861A1
WO2014038861A1 PCT/KR2013/008009 KR2013008009W WO2014038861A1 WO 2014038861 A1 WO2014038861 A1 WO 2014038861A1 KR 2013008009 W KR2013008009 W KR 2013008009W WO 2014038861 A1 WO2014038861 A1 WO 2014038861A1
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inverter
grid
current
output
output current
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PCT/KR2013/008009
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French (fr)
Korean (ko)
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김차현
김시경
서봉균
이종희
심성보
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(주) 세스
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Definitions

  • the present invention relates to a grid-linked inverter, and more particularly, grid-linked inverter current control using an odd harmonic elimination method capable of reducing total harmonic distortion (THD) of the grid-linked inverter current.
  • TDD total harmonic distortion
  • the total harmonic distortion (THD) characteristics of the inverter output current or the maximum power point tracking (Maximum Power Point) Inverter output current suitable for tracking (MPPT) characteristics should be formed.
  • TDD total harmonic distortion
  • MPPT maximum Power Point
  • MPPT maximum Power Point
  • the reference waveform of the inverter output current is not a sinusoidal wave having a certain magnitude, but the magnitude is varied according to solar radiation and wind speed conditions.
  • the steady state error of the PI control varies depending on the MPPT conditions (insolation conditions, wind speed conditions).
  • the MPPT condition is good, that is, when the magnitude of the inverter output current is large, the steady state error of the inverter output current through the PI control is small and the harmonic content of the output current is small.
  • the MPPT condition is not good, that is, when the magnitude of the inverter output current is small, the steady state error of the inverter output current through the PI control is large.
  • the MPPT is controlled according to various solar radiation conditions or wind speed conditions.
  • the inverter output current According to the condition, there is a problem that harmonic components appear in the grid-connected inverter output current under many conditions, and this harmonic causes a serious problem that adversely affects the grid power supply, and a compensation technique is required.
  • An object of the present invention for solving the above problems is to detect the inverter output current characteristics and grid-linked Total Harmonic Distortion (THD) characteristics to generate an output current radix harmonic reduction component for current control of the inverter output current,
  • the present invention provides a grid-connected inverter current control system and apparatus using a radix harmonic reduction method for generating information necessary for designing a major radix component size and grid-connected inverter of an inverter output current using the generated output current radix harmonic reduction component.
  • the grid-linked inverter current control system using the odd harmonic reduction method charges the DC power using energy generated from the power generation unit.
  • a converter for outputting An inverter for switching the output power of the converter to a load or a system;
  • a filter unit connected to the inverter output to remove switching harmonics;
  • a synchronization processing unit for performing synchronization processing of the grid voltage and the inverter output current;
  • detecting inverter output current characteristics by sensing voltage, current, and grid voltage inputted and outputted to the inverter, generating current control data of inverter output current using an odd harmonic reduction algorithm, and generating the inverter based on the generated data.
  • It may be configured to include a control unit for PWM control.
  • the power generation unit may include at least one of solar power generation means and wind power generation means as renewable energy generation means.
  • the converter may be a DC / DC converter that charges DC power and PWM outputs the charged DC power.
  • the inverter is switched in accordance with the PWM control signal input from the control unit, may be a grid-connected inverter for converting the DC power input through the converter into an AC to output to the load or grid through the filter unit.
  • the synchronization processor may synchronize the zero crossing time point in order to synchronize the inverter output current and the grid voltage to implement the maximum output operation.
  • control unit is an MPPT control unit for implementing the MPPT through the AD converter after sensing the output current and voltage of the converter to maximize the amount of power generation of the power generation unit;
  • Radix harmonic reduction unit for receiving the output of the MPPT control unit, the synchronization processing unit and the inverter to output as a reference wave of the inverter output current to remove the harmonic components generated according to the output conditions of the inverter;
  • a subtractor for subtracting the reference wave and inverter output current;
  • a PI controller configured to receive the output of the subtractor and implement tracking control of the grid current and the reference wave current.
  • the grid-connected inverter current control device using the odd harmonic reduction method in the grid-linked power generation system in which the independent power source and the grid power supply is connected, A synchronization processor for performing synchronization processing of the voltage and the inverter output current;
  • An MPPT controller configured to sense an input current and a voltage of the inverter to implement a maximum power point tracking (MPPT) for maximizing the amount of power generated by the independent power source;
  • An odd harmonic reduction unit configured to receive output data of the synchronization processing unit and an MPPT control unit and output current values of the inverter to generate output current odd harmonic reduction data for current control of an inverter output current, and output the current harmonic reduction data;
  • a PI controller configured to output a system inverter PWM gate signal according to a difference between the current reference wave and the output current of the inverter to perform PWM duty cycle control.
  • the grid-linked inverter current control device AD converter for converting the inverter output current to a digital value for measuring the inverter output current;
  • a digital filter unit for removing noise components of the inverter output current.
  • the independent power generation source may include at least one of solar power generation means and wind power generation means.
  • the odd harmonic reduction unit may generate an odd harmonic component for reducing a harmonic component of the inverter output current, synthesize the generated odd harmonic component to the inverter output current, and output the current harmonic component.
  • THD Total Harmonic Distortion
  • the present invention can increase the utilization rate of the system inverter output by using a grid-connected inverter output head harmonic reduction method that follows the MPPT under various solar radiation and wind speed conditions to increase the economic effect of renewable energy to increase the economic benefits Can be.
  • the grid inverter is used to control the grid inverter using the PI control method, and the MPPT control output according to the grid-linked inverter.
  • the harmonic content of the grid-connected inverter output current is monitored, the initial value of the harmonic reduction current controller is set according to the magnitude, and the operation of the current controller is changed from proportional integral control to harmonic reduction proportional control according to the control switching unit. After that, since the output current command value of the grid-connected inverter is changed, it is possible to perform a stable start without overshooting the direct-current voltage.
  • FIG. 1 is a block diagram showing the configuration of a grid-linked inverter current control system using the odd harmonic reduction method according to the present invention.
  • FIG. 2 is a functional block diagram illustrating a functional configuration of a microcontroller for implementing the current control inverter harmonic extraction means applied to FIG. 1.
  • FIG. 1 is a block diagram showing a simple configuration of a grid-connected inverter current control system using a radix harmonic reduction method according to an embodiment of the present invention
  • Figure 2 is a grid-linked inverter using a radix harmonic reduction method according to an embodiment of the present invention
  • the power generation unit 110 includes at least one of solar power generation means such as solar cells, solar modules, solar arrays, or wind power generation means.
  • solar power generation means such as solar cells, solar modules, solar arrays, or wind power generation means.
  • the photovoltaic power generation and the wind power generation have been described as an example of renewable energy.
  • the present invention is not limited thereto, and all power generation means of the same level as the geothermal power generation means may be applied.
  • the DC / DC converter 120 PWM-DC-DCs the first capacitor C1 to charge the DC power and the DC power charged to the first capacitor C1 to output DC power (Vdc). It includes a second capacitor (C2).
  • the DC / DC converter 120 may include an inductor, a switching semiconductor device, and a diode.
  • the grid-connected inverter 130 is switched in accordance with the PWM control signal input from the microcontroller 200, a plurality of output by converting the DC power (Vdc) input through the DC / DC converter 120 to an alternating current Switching semiconductor device MOSFET or IGBT. That is, the grid-connected inverter 130 is provided with a plurality of switching semiconductor elements between the single-phase or three-phase full bridge, the output terminal is a commercial power source for solar power / wind power generation through the LCL filter unit 170 It is a three-phase or single-phase inverter configured to supply to.
  • the grid-linked inverter 130 may be a three-phase or single-phase power inverter, the grid power may be a commercial AC power (AC 220V) single-phase and three-phase power.
  • AC 220V commercial AC power
  • the synchronization processor 140 implements the maximum output operation by synchronizing the grid-connected inverter output current and the grid voltage (E). For this purpose, the zero-crossing time point is synchronized.
  • the microcontroller 200 senses a voltage, a current, and a grid voltage (E) input and output to the DC / DC converter 120 and the grid-connected inverter 130 to process a signal, and then controls the system power synchronous inverter PWM on / off. And PWM control the output current of the grid-connected inverter 130.
  • the microcontroller 200 may be provided with a current sensor (not shown) for sensing the output current shape of the grid-connected inverter 130.
  • the power generation unit 110 When the power generation unit 110 generates energy, the voltage Vpv is charged in the first capacitor C1 to generate energy according to solar radiation or wind speed.
  • the microcontroller 200 may boost the generated energy to a predetermined voltage (Vdc) through the DC / DC converter 120 and then output a current to the system 300 through the grid-linked inverter 130. Invert to ensure
  • the microcontroller 200 output-controls the DC / DC converter 120 to maintain the DC power input to the grid-connected inverter 130 at a constant voltage (Vdc) and outputs to the grid through the grid-linked inverter 130. It should be operated to adjust the current to be made.
  • Vdc constant voltage
  • the grid-linked inverter current control system 100 is provided with a synchronization processing unit 140 for synchronizing the zero crossing time point in order to synchronize the grid voltage to implement the maximum output operation.
  • the microcontroller 200 is an MPPT algorithm unit for maximizing the amount of power generation of the power source 110, such as radix harmonic reduction unit 150, solar / wind power to remove various radix harmonic components included in the system current ( 160) and a PI controller 180 and a subtractor 190 for implementing tracking control of the grid current and the reference wave current.
  • FIG. 2 is a functional block diagram illustrating a functional configuration of a grid-connected inverter current control device using a radix harmonic reduction method according to an embodiment of the present invention.
  • the grid-linked inverter 130 and the entire system 100 of FIG. 1 are controlled. It shows a configuration for.
  • the grid-connected inverter current control device includes a synchronization processor 240 for synchronizing the grid voltage E, an odd harmonic reduction unit 250 for removing harmonic components, and an MPPT controller for maximizing the amount of power generated by the power generation unit 110.
  • a synchronization processor 240 for synchronizing the grid voltage E
  • an odd harmonic reduction unit 250 for removing harmonic components
  • an MPPT controller for maximizing the amount of power generated by the power generation unit 110.
  • 260, the PI controller 280, and a subtractor 290 may be configured.
  • the components may be functional components corresponding to the components of the microcontroller 200 of FIG. 1.
  • the synchronization processor 240 for synchronizing the grid voltage (E) is operated to PLL processing for the synchronization of the grid voltage (E) and the inverter output current (), the MPPT controller 260 of the power generation unit 110 MPPT is implemented through the AD converter 262 after sensing current and voltage in order to maximize solar / wind power generation.
  • the digital filter unit 264 may be further provided at the output terminal of the AD converter 262 to remove noise included in the inverter output current.
  • the output of the MPPT controller 260, the output of the synchronization processor 240 and the output current () of the grid-linked inverter 130 respectively, the odd harmonics.
  • the odd harmonic reduction unit 250 may generate an odd harmonic component for reducing a harmonic component of the inverter output current, synthesize the generated odd harmonic component to the inverter output current, and output the current harmonic component.
  • a reference wave Iref of the grid-linked inverter 130 output current () and the grid-linked inverter output current inputted to the subtractor 290 is input to the PI controller 280, and the control output is controlled through the PWM duty cycle control. Outputs the inverter PWM gate signal.
  • the system-driven inverter current control system and apparatus detect the characteristics of the inverter output current by sensing the inverter output current and obtain waveform information, and detect the characteristics of the inverter output current and reduce the THD of the system inverter current through the harmonic reduction method. Can be reduced.

Abstract

The present invention relates to a system and an apparatus for grid-connected inverter current control using odd harmonics elimination. More particularly, the grid-connected power generation system according to the present invention comprises: a converter for charging and outputting DC power using the energy generated by a generating unit; an inverter for switching the output power of the converter to a load or a system; a filter unit connected to the output of the inverter in order to eliminate switching harmonics; a synchronization processing unit for performing synchronization between the system voltage and the output current of the inverter; and a control unit for sensing the voltage and current being input into and output from the inverter and the system voltage in order to detect output current characteristics of the inverter, generating current control data from the output current of the inverter using an odd harmonics elimination algorithm, and PWM controlling the inverter based on the generated data. Thus, the present invention may sense the output current of the inverter and thereby acquire information on the waveform of the output current of the inverter, and reduce the total harmonic distortion (THD) of the grid-connected inverter current by harmonics elimination.

Description

기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템 및 장치Inverter current control system and device for grid connection using radix harmonic reduction method
본 발명은 계통 연계 인버터에 관한 것으로, 더욱 상세하게는 계통 연계 인버터 전류의 전고조파 왜곡(Total Harminc Distortion: THD)을 감소시킬 수 있는 기수 고조파 저감(Odd Harmonics Elimination) 방식을 이용한 계통 연계 인버터 전류제어 시스템 및 장치에 관한 것이다.The present invention relates to a grid-linked inverter, and more particularly, grid-linked inverter current control using an odd harmonic elimination method capable of reducing total harmonic distortion (THD) of the grid-linked inverter current. A system and apparatus are described.
일반적으로, 태양광 셀 또는 풍력 발전 출력 전압 및 전류의 크기에 따른 출력 전력을 최대로 이용하기 위하여, 인버터 출력 전류의 전고조파 왜곡(Total Harminc Distortion: THD) 특성이나 최대 전력점 추종(Maximum Power Point Tracking: MPPT) 특성에 맞는 인버터 출력 전류를 형성하여야 한다. 이를 위해, 적용대상이 되는 계통 전압 파형을 검출하여 제로 크로싱(Zero Crossing)을 검출하고, 계통에 연계 되는 인버터 출력 전류의 크기를 조절하여, 각 태양광 셀 또는 풍력 발전 출력의 최대점을 추종하는 MPPT 제어를 수행한다. 따라서 태양광의 일사특성이나, 풍속 여건에 따라 계통 연계 인버터 출력전류 크기가 변동된다. 즉, 일사량이 적거나 풍속이 작은 경우 계통 연계 인버터 출력 전류의 크기는 작아지고, 반대로 일사량이 크거나 풍속이 큰 경우의 계통연계 인버터 출력 전류의 크기는 커져야 한다. 일반적으로 계통 연계 인버터 출력 전류 제어 기법으로는 PI(Proportional Integral) 제어, 데드 비트, 퍼지 제어, 신경회로망 제어 등 여러 방법이 사용 되고 있으며, 이 중에서 PI 제어기법이 제어기 설계의 일반성 및 효율성으로 인하여 가장 널리 사용되고 있는 상황이다. In general, in order to maximize the output power according to the size of the solar cell or wind power output voltage and current, the total harmonic distortion (THD) characteristics of the inverter output current or the maximum power point tracking (Maximum Power Point) Inverter output current suitable for tracking (MPPT) characteristics should be formed. To this end, by detecting the grid voltage waveform to be applied to detect the zero crossing (Zero Crossing), by adjusting the magnitude of the inverter output current associated with the grid, to follow the maximum point of each solar cell or wind power output Perform MPPT control. Therefore, the magnitude of the output current of the grid-connected inverter varies according to the solar radiation characteristics or the wind speed. That is, when the amount of solar radiation is small or the wind speed is small, the magnitude of the grid-connected inverter output current is small, on the contrary, the magnitude of the grid-connected inverter output current when the solar radiation is large or the wind speed is large. In general, various methods such as PI (Proportional Integral) control, dead bit, fuzzy control, and neural network control are used for the grid-inverted inverter output current control technique. It is a widely used situation.
PI 제어 기법을 통하여 MPPT를 구현 하는데 있어서, 인버터 출력 전류의 기준 파형이 일정 크기를 가지는 정현파가 아니라 태양광 일사량과 풍속 조건에 따라 크기가 변동되게 된다. 이러한 상황에서 PI 제어가 가지고 있는 정상 상태 에러는 MPPT 조건(일사량 조건, 풍속조건)에 따라 변동되게 된다. MPPT 조건이 좋은 경우, 즉 인버터 출력 전류의 크기가 큰 경우에는 PI 제어를 통한 인버터 출력 전류의 정상 상태 에러가 적어 출력 전류의 고조파 성분이 적다. 반면에 MPPT 조건이 좋지 않은 경우, 즉 인버터 출력 전류의 크기가 작은 경우에는 PI 제어를 통한 인버터 출력 전류의 정상 상태 에러가 크게 나타난다.In implementing MPPT through the PI control technique, the reference waveform of the inverter output current is not a sinusoidal wave having a certain magnitude, but the magnitude is varied according to solar radiation and wind speed conditions. In this situation, the steady state error of the PI control varies depending on the MPPT conditions (insolation conditions, wind speed conditions). When the MPPT condition is good, that is, when the magnitude of the inverter output current is large, the steady state error of the inverter output current through the PI control is small and the harmonic content of the output current is small. On the other hand, when the MPPT condition is not good, that is, when the magnitude of the inverter output current is small, the steady state error of the inverter output current through the PI control is large.
이러한 문제를 해결하기 위하여 계통 전압을 측정하여 피드포워드(FeedForward) 제어를 통하여 PI 제어기 출력전류의 고조파를 저감하기 위한 방법이 사용되고 있으나, 이 기법 또한 계통 전압에 고조파 성분이 함유된 경우 고조파 성분들이 전류 기준파에 반영되어 인버터 출력 전류의 정상 상태 에러가 커지고 출력 전류의 고조파 성분이 증가되는 문제점이 있다. In order to solve this problem, a method for reducing the harmonics of the PI controller output current through the feedforward control by measuring the grid voltage has been used, but this technique also includes the harmonic components when the grid voltage contains harmonic components. As reflected by the reference wave, a steady state error of the inverter output current increases and a harmonic component of the output current increases.
따라서 종래의 PI 제어 기법을 이용한 계통 연계 인버터 출력 전류제어 방법이나, 계통 전압을 측정을 이용한 피드 포워드 제어를 통한 계통 연계 인버터 출력 전류제어 방법의 경우에서와 같이, 다양한 일사량 조건 또는 풍속조건에 따라 MPPT 조건에 맞는 인버터 출력 전류를 제어하는 경우, 많은 조건에서 계통 연계 인버터 출력 전류에 고조파 성분이 나타나는 문제가 있으며 이러한 고조파는 계통 전원에 악영향을 끼치는 심각한 문제를 초래하므로 이에 대한 보상 기법이 필요하다.Therefore, as in the case of a grid-connected inverter output current control method using a conventional PI control method or a grid-linked inverter output current control method through a feed forward control using a grid voltage measurement, the MPPT is controlled according to various solar radiation conditions or wind speed conditions. In the case of controlling the inverter output current according to the condition, there is a problem that harmonic components appear in the grid-connected inverter output current under many conditions, and this harmonic causes a serious problem that adversely affects the grid power supply, and a compensation technique is required.
상기와 같은 문제점을 해결하기 위한 본 발명의 목적은, 인버터 출력 전류 특성 및 계통 연계 THD(Total Harmonic Distortion) 특성을 검출하여 인버터 출력 전류의 전류제어를 위한 출력 전류 기수 고조파 저감 성분을 생성하고, 상기 생성된 출력 전류 기수 고조파 저감 성분을 이용하여 인버터 출력 전류의 주요 기수 고조파 성분 크기 및 계통 연계 인버터 설계에 필요한 정보를 생성하는 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템 및 장치를 제공하는데 있다.An object of the present invention for solving the above problems is to detect the inverter output current characteristics and grid-linked Total Harmonic Distortion (THD) characteristics to generate an output current radix harmonic reduction component for current control of the inverter output current, The present invention provides a grid-connected inverter current control system and apparatus using a radix harmonic reduction method for generating information necessary for designing a major radix component size and grid-connected inverter of an inverter output current using the generated output current radix harmonic reduction component.
상기와 같은 목적을 달성하기 위해 본 발명의 실시예에 따른 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템은, 계통 연계형 발전 시스템에 있어서, 발전부로부터 생성된 에너지를 이용하여 DC 전원을 충전하고 출력하는 컨버터; 상기 컨버터의 출력전원을 부하나 계통으로 스위칭하는 인버터; 상기 인버터 출력에 연결되어 스위칭 고조파를 제거하는 필터부; 계통전압과 인버터 출력전류의 동기처리를 수행하는 동기 처리부; 및 상기 인버터에 입출력되는 전압과 전류 및 계통전압을 센싱하여 인버터 출력 전류 특성을 검출하고, 기수 고조파 저감 알고리즘을 이용하여 인버터 출력 전류의 전류제어 데이터를 생성하고, 생성된 데이터를 기반으로 상기 인버터를 PWM 제어하는 제어부를 포함하여 구성될 수 있다.In order to achieve the above object, the grid-linked inverter current control system using the odd harmonic reduction method according to the embodiment of the present invention, in the grid-linked power generation system, charges the DC power using energy generated from the power generation unit. A converter for outputting; An inverter for switching the output power of the converter to a load or a system; A filter unit connected to the inverter output to remove switching harmonics; A synchronization processing unit for performing synchronization processing of the grid voltage and the inverter output current; And detecting inverter output current characteristics by sensing voltage, current, and grid voltage inputted and outputted to the inverter, generating current control data of inverter output current using an odd harmonic reduction algorithm, and generating the inverter based on the generated data. It may be configured to include a control unit for PWM control.
바람직하게, 상기 발전부는 신재생 에너지 발전 수단으로서, 태양광 발전 수단과 풍력 발전 수단 중 적어도 하나를 포함할 수 있다.Preferably, the power generation unit may include at least one of solar power generation means and wind power generation means as renewable energy generation means.
바람직하게, 상기 컨버터는 DC 전원을 충전하고, 충전된 DC전원을 PWM 스위칭하여 출력하는 DC/DC 컨버터일 수 있다.Preferably, the converter may be a DC / DC converter that charges DC power and PWM outputs the charged DC power.
바람직하게, 상기 인버터는 상기 제어부로부터 입력된 PWM 제어신호에 따라 스위칭 되어, 상기 컨버터를 통해 입력되는 DC전원을 교류로 변환하여 상기 필터부를 통해 부하나 계통으로 출력하는 계통 연계 인버터일 수 있다.Preferably, the inverter is switched in accordance with the PWM control signal input from the control unit, may be a grid-connected inverter for converting the DC power input through the converter into an AC to output to the load or grid through the filter unit.
바람직하게, 상기 동기 처리부는 인버터 출력 전류와 계통전압을 동기화하여 최대 출력 동작을 구현하기 위하여 제로크로싱 시점을 동기화 처리할 수 있다.Preferably, the synchronization processor may synchronize the zero crossing time point in order to synchronize the inverter output current and the grid voltage to implement the maximum output operation.
바람직하게, 상기 제어부는 상기 발전부의 발전량을 최대로 하기 위해 상기 컨버터의 출력전류 및 전압을 센싱한 후 AD 컨버터를 통하여 MPPT를 구현하는 MPPT 제어부; 상기 인버터의 출력 조건에 따라 발생되는 고조파 성분을 제거하기 위해 상기 MPPT 제어부, 동기 처리부 및 인버터의 출력을 받아 인버터 출력 전류의 기준파로 출력하는 기수 고조파 저감부; 상기 기준파와 인버터 출력 전류를 감산하는 감산기; 및 상기 감산기의 출력을 받아 계통 전류와 기준파 전류의 추종 제어를 구현하는 PI제어부를 포함하여 구성될 수 있다.Preferably, the control unit is an MPPT control unit for implementing the MPPT through the AD converter after sensing the output current and voltage of the converter to maximize the amount of power generation of the power generation unit; Radix harmonic reduction unit for receiving the output of the MPPT control unit, the synchronization processing unit and the inverter to output as a reference wave of the inverter output current to remove the harmonic components generated according to the output conditions of the inverter; A subtractor for subtracting the reference wave and inverter output current; And a PI controller configured to receive the output of the subtractor and implement tracking control of the grid current and the reference wave current.
상기와 같은 목적을 달성하기 위해 본 발명의 실시예에 따른 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 장치는, 독립 발전원과 계통 전원이 연계된 계통 연계형 발전 시스템에 있어서, 상기 계통전원의 전압과 인버터 출력전류의 동기처리를 수행하는 동기 처리부; 상기 인버터의 입력 전류 및 전압을 센싱하여 상기 독립 발전원의 발전량을 최대로 하기 위한 최대 전력점 추종(MPPT)을 구현하는 MPPT 제어부; 상기 동기 처리부, MPPT 제어부의 출력 데이터와 상기 인버터의 출력 전류값을 받아 인버터 출력전류의 전류제어를 위한 출력전류 기수 고조파 저감 데이터를 생성하고, 전류 기준파로서 출력하는 기수 고조파 저감부; 및 상기 전류 기준파와 상기 인버터의 출력 전류 차이에 따른 계통 인버터 PWM 게이트 신호를 출력하여 PWM Duty Cycle 제어를 수행하는 PI제어부를 포함하여 구성될 수 있다.In order to achieve the above object, the grid-connected inverter current control device using the odd harmonic reduction method according to the embodiment of the present invention, in the grid-linked power generation system in which the independent power source and the grid power supply is connected, A synchronization processor for performing synchronization processing of the voltage and the inverter output current; An MPPT controller configured to sense an input current and a voltage of the inverter to implement a maximum power point tracking (MPPT) for maximizing the amount of power generated by the independent power source; An odd harmonic reduction unit configured to receive output data of the synchronization processing unit and an MPPT control unit and output current values of the inverter to generate output current odd harmonic reduction data for current control of an inverter output current, and output the current harmonic reduction data; And a PI controller configured to output a system inverter PWM gate signal according to a difference between the current reference wave and the output current of the inverter to perform PWM duty cycle control.
바람직하게, 계통 연계 인버터 전류제어 장치는, 인버터 출력 전류 측정을 위해 인버터 출력 전류를 디지털 값으로 변환하는 AD 컨버터; 및 인버터 출력 전류의 노이즈 성분을 제거하는 디지털 필터부를 더 포함하여 구성될 수 있다.Preferably, the grid-linked inverter current control device, AD converter for converting the inverter output current to a digital value for measuring the inverter output current; And a digital filter unit for removing noise components of the inverter output current.
바람직하게, 상기 독립 발전원은 태양광 발전 수단과 풍력 발전 수단 중 적어도 하나를 포함할 수 있다.Preferably, the independent power generation source may include at least one of solar power generation means and wind power generation means.
바람직하게, 상기 기수 고조파 저감부는 인버터 출력전류의 고조파 성분을 저감시키는 기수 고조파 성분을 생성하고, 생성된 기수 고조파 성분을 인버터 출력전류에 합성하여 전류 기준파로서 출력할 수 있다.Preferably, the odd harmonic reduction unit may generate an odd harmonic component for reducing a harmonic component of the inverter output current, synthesize the generated odd harmonic component to the inverter output current, and output the current harmonic component.
본 발명에 따르면, 계통 인버터 전류의 THD(Total Harmonic Distortion)를 감소시킬 수 있으며, 또한 계통 연계 인버터 기동 시 인버터 입력 직류 전압의 오버 슛(overshoot)을 막을 수 있어 신뢰성 높은 제어와 소자 내압의 저감을 도모할 수 있다.According to the present invention, THD (Total Harmonic Distortion) of the grid inverter current can be reduced, and overshoot of the inverter input DC voltage can be prevented when the grid-linked inverter is started, so that reliable control and reduction of device breakdown voltage can be prevented. We can plan.
또한 본 발명은 다양한 일사량 및 풍속 조건하에서 MPPT를 추종하는 계통 연계 인버터 출력 기수 고조파 저감 법을 이용하여 계통 인버터 출력 이용률을 높일 수 있어 신재생 에너지의 매전(賣電) 효과를 높여 경제적 이익을 상향 시킬 수 있다.In addition, the present invention can increase the utilization rate of the system inverter output by using a grid-connected inverter output head harmonic reduction method that follows the MPPT under various solar radiation and wind speed conditions to increase the economic effect of renewable energy to increase the economic benefits Can be.
또한 본 발명은 계통 연계 인버터에 의하면 상기 MPPT제어 출력이 큰 경우 즉, 태양광, 풍력 발전 출력이 큰 경우, 전류 제어 인버터의 제어 방식을 PI　제어 방식을 이용하여 계통 인버터를 제어하고, MPPT제어 출력이 작은 경우 즉, 계통 연계 인버터 출력 전류의 고조파 성분을 모니터링 하고 크기에 따라 고조파 저감 전류 제어기의 초기치를 설정함과 동시에 제어 전환부에 따라 전류제어기의 동작을 비례 적분 제어로부터 고조파 저감 비례 제어에 바꾼 후, 계통 연계 인버터 출력 전류 지령치가 변동 되므로 직류 전압(direct-current voltage)이 오버슛(overshoot) 하지 않는 안정된 기동을 실시할 수 있는 효과가 있다.In addition, according to the present invention, when the MPPT control output is large, that is, when the photovoltaic or wind power output is large, the grid inverter is used to control the grid inverter using the PI control method, and the MPPT control output according to the grid-linked inverter. In this small case, the harmonic content of the grid-connected inverter output current is monitored, the initial value of the harmonic reduction current controller is set according to the magnitude, and the operation of the current controller is changed from proportional integral control to harmonic reduction proportional control according to the control switching unit. After that, since the output current command value of the grid-connected inverter is changed, it is possible to perform a stable start without overshooting the direct-current voltage.
도 1은 본 발명에 따른 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템의 구성을 나타낸 블록도이다.1 is a block diagram showing the configuration of a grid-linked inverter current control system using the odd harmonic reduction method according to the present invention.
도 2는 도 1에 적용된 전류 제어 인버터 고조파 추출 수단의 구현을 위한 마이크로 컨트롤러의 기능적 구성을 나타낸 기능 블록도이다.FIG. 2 is a functional block diagram illustrating a functional configuration of a microcontroller for implementing the current control inverter harmonic extraction means applied to FIG. 1.
이하, 본 발명의 바람직한 실시 예들을 첨부한 도면을 참조하여 상세히 설명한다. 도면들 중 동일한 구성요소들은 가능한 한 어느 곳에서든지 동일한 부호들로 나타내고 있음에 유의해야 한다. 또한 본 발명의 요지를 불필요하게 흐릴 수 있는 공지 기능 및 구성에 대한 상세한 설명은 생략한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.
또한, 이하에서의 본 발명은 인버터 출력 전류의 전류제어 주파수 성분을 측정하기 위해, 인버터 출력 전류의 기수 고조파 성분 생성 수단으로 전류성분을 추출하여 인버터 출력 전류의 THD 특성정보를 생성하는 기수 고조파 저감(Odd Harmonics Elimination) 방식을 이용한 계통 연계 인버터 전류제어 시스템을 바람직한 실시 예로써 설명할 것이나, 본 발명의 기술적 사상은 이에 한정되거나 제한되지 않고 당업자에 의해 변형되어 다양하게 실시될 수 있음은 자명한 것이다.In addition, the present invention below, in order to measure the current control frequency component of the inverter output current, by extracting the current component by the radix harmonic component generating means of the inverter output current to reduce the harmonic harmonics of generating THD characteristic information of the inverter output current ( Odd Harmonics Elimination) will be described as a system-driven inverter current control system as a preferred embodiment, but the technical spirit of the present invention is not limited or limited to this, it will be apparent that various modifications can be made by those skilled in the art.
도 1은 본 발명의 실시 예에 따른 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템의 간략한 구성을 나타낸 블록도이고, 도 2는 본 발명의 실시 예에 따른 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 장치의 기능적 구성을 나타낸 기능 블록도이다. 도 1 및 도 2를 참조하면, 계통 연계 인버터 전류제어 시스템(100)은, 발전부(110)로부터 생성된 에너지를 이용하여 DC 전원을 충전하고 출력하는 DC/DC 컨버터(120), 계통 연계 인버터(130), 계통(300)의 계통전압(E)을 동기화하는 동기 처리부(140) 및 마이크로컨트롤러(200)를 포함한다.1 is a block diagram showing a simple configuration of a grid-connected inverter current control system using a radix harmonic reduction method according to an embodiment of the present invention, Figure 2 is a grid-linked inverter using a radix harmonic reduction method according to an embodiment of the present invention A functional block diagram showing the functional configuration of the current control device. 1 and 2, the grid-linked inverter current control system 100 includes a DC / DC converter 120 and a grid-linked inverter that charge and output DC power using energy generated from the power generation unit 110. 130, the synchronization processor 140 and the microcontroller 200 for synchronizing the system voltage E of the system 300 are included.
상기 발전부(110)는 태양전지나 태양광 모듈, 태양광 어레이와 같은 태양광 발전 수단 또는 풍력 발전 수단 중 적어도 하나를 포함한다. 본 발명에서는 신재생 에너지로서 태양광 발전과 풍력 발전을 예로 들어 설명하였으나 이에 국한되지 않으며, 지열 발전 수단과 같은 동등한 수준의 발전 수단이 모두 적용될 수 있다.The power generation unit 110 includes at least one of solar power generation means such as solar cells, solar modules, solar arrays, or wind power generation means. In the present invention, the photovoltaic power generation and the wind power generation have been described as an example of renewable energy. However, the present invention is not limited thereto, and all power generation means of the same level as the geothermal power generation means may be applied.
상기 DC/DC 컨버터(120)는 DC 전원을 충전하는 제1 커패시터(C1)와, 상기 제1 커패시터(C1)에 충전된 DC전원을 PWM 스위칭하여 DC/DC 변환하여 DC전원(Vdc)을 출력하는 제2 커패시터(C2)를 포함한다. 상기 DC/DC 컨버터(120)는 인덕터와 스위칭 반도체 소자 및 다이오드를 포함하여 구성될 수 있다.The DC / DC converter 120 PWM-DC-DCs the first capacitor C1 to charge the DC power and the DC power charged to the first capacitor C1 to output DC power (Vdc). It includes a second capacitor (C2). The DC / DC converter 120 may include an inductor, a switching semiconductor device, and a diode.
상기 계통 연계 인버터(130)는 마이크로 컨트롤러(200)로부터 입력된 PWM 제어신호에 따라 스위칭 되어, 상기 DC/DC 컨버터(120)를 통해 입력되는 DC전원(Vdc)을 교류로 변환하여 출력하는 복수의 스위칭 반도체 소자 MOSFET 또는 IGBT를 구비한다. 즉, 상기 계통 연계 인버터(130)는 단상 또는 3상 풀브릿지(Full Bridge) 사이에 복수의 스위칭 반도체 소자를 구비하여, 출력단이 LCL 필터부(170)를 통하여 태양광/풍력 발전 전력을 상용전원에 공급하도록 구성된 3상 또는 단상 인버터이다.The grid-connected inverter 130 is switched in accordance with the PWM control signal input from the microcontroller 200, a plurality of output by converting the DC power (Vdc) input through the DC / DC converter 120 to an alternating current Switching semiconductor device MOSFET or IGBT. That is, the grid-connected inverter 130 is provided with a plurality of switching semiconductor elements between the single-phase or three-phase full bridge, the output terminal is a commercial power source for solar power / wind power generation through the LCL filter unit 170 It is a three-phase or single-phase inverter configured to supply to.
상술한 바와 같이, 상기 계통 연계 인버터(130)는 3상 또는 단상전원 인버터일 수 있고, 계통전원은 상용 교류전원(AC 220V) 단상 및 3상 전원일 수 있다.As described above, the grid-linked inverter 130 may be a three-phase or single-phase power inverter, the grid power may be a commercial AC power (AC 220V) single-phase and three-phase power.
상기 동기 처리부(140)는 계통 연계 인버터 출력 전류와 계통전압(E)을 동기화하여 최대 출력 동작을 구현하는데, 이를 위하여 제로크로싱 시점을 동기화 처리한다.The synchronization processor 140 implements the maximum output operation by synchronizing the grid-connected inverter output current and the grid voltage (E). For this purpose, the zero-crossing time point is synchronized.
상기 마이크로컨트롤러(200)는 상기 DC/DC 컨버터(120) 및 계통 연계 인버터(130)에 입출력되는 전압과 전류 및 계통전압(E)을 센싱하여 신호 처리한 후 계통 전원 동기 인버터 PWM 온/오프 제어와 상기 계통 연계 인버터(130)의 출력 전류 PWM 제어를 한다. 이를 위해 상기 마이크로컨트롤러(200)는 상기 계통 연계 인버터(130)의 출력 전류 형상을 센싱하는 전류센서(미도시)를 구비할 수 있다. 상기 발전부(110)에서 에너지를 발생하면, 상기 제1 커패시터(C1)에 전압(Vpv)이 충전되면서 일사량 또는 풍속에 따른 에너지를 발생할 수 있게 된다. 상기 마이크로콘트롤러(200)는 이렇게 발생된 에너지를 상기 DC/DC 컨버터(120)를 통해 일정 전압(Vdc)까지 승압시킨 후 상기 계통 연계 인버터(130)를 통해 계통(300)에 전류를 출력할 수 있도록 인버팅을 한다.The microcontroller 200 senses a voltage, a current, and a grid voltage (E) input and output to the DC / DC converter 120 and the grid-connected inverter 130 to process a signal, and then controls the system power synchronous inverter PWM on / off. And PWM control the output current of the grid-connected inverter 130. To this end, the microcontroller 200 may be provided with a current sensor (not shown) for sensing the output current shape of the grid-connected inverter 130. When the power generation unit 110 generates energy, the voltage Vpv is charged in the first capacitor C1 to generate energy according to solar radiation or wind speed. The microcontroller 200 may boost the generated energy to a predetermined voltage (Vdc) through the DC / DC converter 120 and then output a current to the system 300 through the grid-linked inverter 130. Invert to ensure
상기 마이크로컨트롤러(200)는 상기 계통 연계 인버터(130)로 입력되는 DC 전원을 일정한 전압(Vdc)으로 유지하도록 DC/DC 컨버터(120)를 출력 제어하고 계통 연계 인버터(130)를 통해 계통에 출력되는 전류를 조정하도록 동작되어야 한다.The microcontroller 200 output-controls the DC / DC converter 120 to maintain the DC power input to the grid-connected inverter 130 at a constant voltage (Vdc) and outputs to the grid through the grid-linked inverter 130. It should be operated to adjust the current to be made.
이를 위해, 본 발명에 따른 계통 연계 인버터 전류제어 시스템(100)에서는 계통전압을 동기화하여 최대 출력 동작을 구현하기 위하여 제로크로싱 시점을 동기화 처리하는 동기 처리부(140)가 구비된다. 또한 상기 마이크로컨트롤러(200)는 계통 전류에 포함된 다양한 기수 고조파 성분을 제거하기 위한 기수 고조파 저감부(150), 태양광/풍력 등 발전원(110)의 발전량을 최대로 하기 위한 MPPT 알고리즘부(160) 및 계통 전류와 기준파 전류의 추종 제어를 구현하는 PI제어부(180), 감산기(190)을 포함하여 구성된다.To this end, the grid-linked inverter current control system 100 according to the present invention is provided with a synchronization processing unit 140 for synchronizing the zero crossing time point in order to synchronize the grid voltage to implement the maximum output operation. In addition, the microcontroller 200 is an MPPT algorithm unit for maximizing the amount of power generation of the power source 110, such as radix harmonic reduction unit 150, solar / wind power to remove various radix harmonic components included in the system current ( 160) and a PI controller 180 and a subtractor 190 for implementing tracking control of the grid current and the reference wave current.
도 2는 본 발명의 실시 예에 따른 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 장치의 기능적 구성을 나타낸 기능 블록도로서, 상기 도 1의 계통 연계 인버터(130) 및 전체 시스템(100)을 제어하기 위한 구성을 나타낸 것이다. FIG. 2 is a functional block diagram illustrating a functional configuration of a grid-connected inverter current control device using a radix harmonic reduction method according to an embodiment of the present invention. The grid-linked inverter 130 and the entire system 100 of FIG. 1 are controlled. It shows a configuration for.
계통 연계 인버터 전류제어 장치는, 계통전압(E)을 동기화하는 동기 처리부(240), 고조파 성분을 제거하기 위한 기수 고조파 저감부(250), 발전부(110)의 발전량을 최대로 하기 위한 MPPT 제어부(260), PI제어부(280), 감산기(290)를 포함하여 구성될 수 있다. 상기 구성 요소들은 상기 도 1의 마이크로컨트롤러(200)의 구성 요소들에 대응되는 기능적인 구성 요소일 수 있다.The grid-connected inverter current control device includes a synchronization processor 240 for synchronizing the grid voltage E, an odd harmonic reduction unit 250 for removing harmonic components, and an MPPT controller for maximizing the amount of power generated by the power generation unit 110. 260, the PI controller 280, and a subtractor 290 may be configured. The components may be functional components corresponding to the components of the microcontroller 200 of FIG. 1.
계통전압(E)을 동기화하는 동기 처리부(240)는 계통 전압(E)과 인버터 출력전류()의 동기처리를 위하여 PLL처리 되게 동작 되며, 상기 MPPT 제어부(260)는 상기 발전부(110)의 태양광/풍력 발전량을 최대로 하기 위하여 전류 및 전압을 센싱 후 AD 컨버터(262)를 통하여 MPPT를 구현한다. 이때 인버터 출력 전류 등에 포함된 노이즈 제거를 위해 상기 AD 컨버터(262) 출력단에 디지털필터부(264)가 더 구비될 수 있다. 상기 계통 연계 인버터(130)의 출력 조건에 따라 발생되는 고조파 성분을 제거하기 위하여, MPPT 제어부(260) 출력, 동기 처리부(240) 출력 및 계통 연계 인버터(130) 출력전류()는 각각 상기 기수 고조파 저감부(250)에 입력되어 계통 연계 인버터(130) 출력 전류의 기준파(Iref)를 출력한다. 상기 기수 고조파 저감부(250)는 인버터 출력전류의 고조파 성분을 저감시키는 기수 고조파 성분을 생성하고, 생성된 기수 고조파 성분을 인버터 출력전류에 합성하여 전류 기준파로서 출력할 수 있다.The synchronization processor 240 for synchronizing the grid voltage (E) is operated to PLL processing for the synchronization of the grid voltage (E) and the inverter output current (), the MPPT controller 260 of the power generation unit 110 MPPT is implemented through the AD converter 262 after sensing current and voltage in order to maximize solar / wind power generation. In this case, the digital filter unit 264 may be further provided at the output terminal of the AD converter 262 to remove noise included in the inverter output current. In order to remove the harmonic components generated according to the output condition of the grid-connected inverter 130, the output of the MPPT controller 260, the output of the synchronization processor 240 and the output current () of the grid-linked inverter 130, respectively, the odd harmonics. It is input to the reduction unit 250 to output a reference wave (Iref) of the output current of the grid-connected inverter 130. The odd harmonic reduction unit 250 may generate an odd harmonic component for reducing a harmonic component of the inverter output current, synthesize the generated odd harmonic component to the inverter output current, and output the current harmonic component.
상기 감산기(290)로 입력되는 계통 연계 인버터(130) 출력전류()와 계통 연계 인버터 출력 전류의 기준파(Iref)는 PI제어부(280)에 입력되고, 제어 출력은 PWM Duty Cycle 제어를 통하여 계통 인버터 PWM 게이트 신호를 출력하게 된다.A reference wave Iref of the grid-linked inverter 130 output current () and the grid-linked inverter output current inputted to the subtractor 290 is input to the PI controller 280, and the control output is controlled through the PWM duty cycle control. Outputs the inverter PWM gate signal.
상기와 같은 구성을 통해 본 발명에 따른 계통 연계 인버터 전류제어 시스템 및 장치는, 인버터 출력 전류를 센싱하고 파형 정보를 알아냄으로써, 인버터 출력 전류의 특성을 검출하고 고조파 저감법을 통해 계통 인버터 전류의 THD를 감소시킬 수 있다.Through the above configuration, the system-driven inverter current control system and apparatus according to the present invention detect the characteristics of the inverter output current by sensing the inverter output current and obtain waveform information, and detect the characteristics of the inverter output current and reduce the THD of the system inverter current through the harmonic reduction method. Can be reduced.
이상에서는 본 발명에서 특정의 바람직한 실시 예에 대하여 도시하고 또한 설명하였다. 그러나, 본 발명은 상술한 실시 예에 한정되지 아니하며, 특허 청구의 범위에서 첨부하는 본 발명의 요지를 벗어남이 없이 당해 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 누구든지 다양한 변형 실시가 가능할 것이다.In the above, specific preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art without departing from the gist of the present invention attached to the claims. will be.

Claims (5)

  1. 계통 연계형 발전 시스템에 있어서,In the grid-connected power generation system,
    발전부로부터 생성된 에너지를 이용하여 DC 전원을 충전하고 출력하는 컨버터;A converter for charging and outputting DC power using energy generated from the power generation unit;
    상기 컨버터의 출력전원을 부하나 계통으로 스위칭하는 인버터;An inverter for switching the output power of the converter to a load or a system;
    상기 인버터 출력에 연결되어 스위칭 고조파를 제거하는 필터부;A filter unit connected to the inverter output to remove switching harmonics;
    계통전압과 인버터 출력전류의 동기처리를 수행하는 동기 처리부; 및A synchronization processing unit for performing synchronization processing of the grid voltage and the inverter output current; And
    상기 인버터에 입출력되는 전압과 전류 및 계통전압을 센싱하여 인버터 출력 전류 특성을 검출하고, 기수 고조파 저감 알고리즘을 이용하여 인버터 출력 전류의 전류제어 데이터를 생성하고, 생성된 데이터를 기반으로 상기 인버터를 PWM 제어하는 제어부를 포함하며,Detects the inverter output current characteristics by sensing the voltage, current and grid voltage input and output to the inverter, generates current control data of the inverter output current using the odd harmonic reduction algorithm, PWM based on the generated data It includes a control unit for controlling,
    상기 제어부는 상기 컨버터의 출력전류 및 전압을 센싱하여 상기 발전부의 발전량을 최대로 하는 최대 전력점 추종(MPPT)을 구현하는 MPPT 제어부;The controller may include an MPPT controller configured to sense an output current and a voltage of the converter to implement a maximum power point tracking (MPPT) for maximizing the amount of power generated by the generator;
    상기 인버터의 출력 조건에 따라 발생되는 고조파 성분을 제거하기 위해 상기 MPPT 제어부, 동기 처리부 및 인버터의 출력을 받아 기수 고조파 알고리즘을 적용하여 인버터 출력 전류의 기준파로서 출력하는 기수 고조파 저감부;Radix harmonic reduction unit for receiving the output of the MPPT control unit, the synchronization processing unit and the inverter to output a reference wave of the inverter output current by applying an odd harmonic algorithm to remove the harmonic components generated according to the output conditions of the inverter;
    상기 기준파와 인버터 출력 전류를 감산하는 감산기; 및A subtractor for subtracting the reference wave and inverter output current; And
    상기 감산기의 출력을 받아 계통 전류와 기준파 전류의 추종 제어를 구현하는 PI제어부를 포함하는 것을 특징으로 하는 기수 고조파 저감 방식을 이용한 계통연계 인버터 전류제어 시스템.A grid-connected inverter current control system using a radix harmonic reduction method characterized in that it comprises a PI control unit for receiving the output of the subtractor to implement the following control of the grid current and the reference wave current.
  2. 제1항에 있어서, 상기 발전부는According to claim 1, wherein the power generation unit
    태양광 발전 수단과 풍력 발전 수단 중 적어도 하나를 포함하는 것을 특징으로 하는 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템.Grid-connected inverter current control system using a radix harmonic reduction method characterized in that it comprises at least one of solar power generation means and wind power generation means.
  3. 제1항에 있어서, 상기 컨버터는The method of claim 1, wherein the converter
    DC 전원을 충전하고, 충전된 DC전원을 PWM 스위칭하여 출력하는 DC/DC 컨버터인 것을 특징으로 하는 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템.A system-driven inverter current control system using a radix harmonic reduction method characterized in that the DC / DC converter to charge the DC power, PWM output the charged DC power.
  4. 제1항에 있어서, 상기 인버터는The method of claim 1, wherein the inverter
    상기 제어부로부터 입력된 PWM 제어신호에 따라 스위칭 되어, 상기 컨버터를 통해 입력되는 DC전원을 교류로 변환하여 상기 필터부를 통해 부하나 계통으로 출력하는 계통 연계 인버터인 것을 특징으로 하는 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템.Switched in accordance with the PWM control signal input from the control unit, using a radix harmonic reduction method characterized in that the system-connected inverter converts the DC power input through the converter into an AC to output to the load or system through the filter unit Grid-connected inverter current control system.
  5. 제1항에 있어서, 상기 동기 처리부는The method of claim 1, wherein the synchronization processing unit
    최대 출력 동작을 구현하기 위하여 인버터 출력 전류와 계통전압을 동기화 처리하는 것을 특징으로 하는 기수 고조파 저감 방식을 이용한 계통 연계 인버터 전류제어 시스템.A grid-connected inverter current control system using a radix harmonic reduction method characterized by synchronizing the inverter output current and the grid voltage to realize maximum output operation.
PCT/KR2013/008009 2012-09-06 2013-09-05 System and apparatus for grid-connected inverter current control using odd harmonics elimination WO2014038861A1 (en)

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