TWI548200B - Inverter apparatus and power conversion method thereof - Google Patents

Inverter apparatus and power conversion method thereof Download PDF

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TWI548200B
TWI548200B TW104105099A TW104105099A TWI548200B TW I548200 B TWI548200 B TW I548200B TW 104105099 A TW104105099 A TW 104105099A TW 104105099 A TW104105099 A TW 104105099A TW I548200 B TWI548200 B TW I548200B
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current
harmonic component
inverter device
rms value
power source
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TW104105099A
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TW201534041A (en
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陳漢威
游俊豪
劉家樺
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全漢企業股份有限公司
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    • 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
    • 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
    • H02M1/36—Means for starting or stopping converters
    • 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
    • H02H7/10—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 converters; for rectifiers
    • H02H7/12—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 converters; for rectifiers for static converters or rectifiers
    • H02H7/122—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 converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1225—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 converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
    • 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
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • 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
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Description

逆變裝置及其電源轉換方法 Inverter device and power conversion method thereof

本發明是有關於一種電子裝置，且特別是有關於一種逆變裝置及其電源轉換方法。 The present invention relates to an electronic device, and more particularly to an inverter device and a power conversion method thereof.

逆變器(inverter)為一種電源轉換裝置，其通常是通過功率半導體元件的切換把直流輸入電源轉換為交流輸出電源。一般並網型逆變裝置的輸出端會連接到電網，當逆變裝置出現故障或被強制關閉時，市電電流會回灌到逆變裝置，而可能造成逆變裝置的逆變器毀損。為避免上述情形，可令操作在邊界傳導模式(boundary conduction mode，BCM)的逆變器在零交越點附近停止動作，此方式雖可有效避免因市電電流回灌而造成逆變器的毀損，但逆變器停止動作所產生的諧波將使電流總諧波失真變大。 An inverter is a power conversion device that typically converts a DC input power source into an AC output power source through switching of power semiconductor components. The output of the general grid-connected inverter device is connected to the grid. When the inverter device fails or is forcibly closed, the utility current will be recharged to the inverter device, which may cause the inverter of the inverter device to be damaged. In order to avoid the above situation, the inverter operating in the boundary conduction mode (BCM) can be stopped near the zero crossing point. This method can effectively avoid the damage of the inverter caused by the recharging of the mains current. However, the harmonics generated by the stop action of the inverter will make the total harmonic distortion of the current larger.

本發明提供一種逆變裝置及其電源轉換方法，可有效降低逆變裝置的電流總諧波失真。 The invention provides an inverter device and a power conversion method thereof, which can effectively reduce current total harmonic distortion of the inverter device.

本發明的逆變裝置包括逆變電路、偵測單元以及控制單元。其中逆變電路接收直流電源，並將直流電源轉換為交流電源。偵測單元偵測交流電源的交流電流的電流諧波分量，並依據電流諧波分量產生電流調整信號。控制單元耦接逆變電路與偵測電路，輸出脈寬調變信號控制逆變電路將直流電源轉換為交流電源，依據電流調整信號產生抵銷電流以疊加至交流電流。 The inverter device of the present invention includes an inverter circuit, a detecting unit, and a control unit. The inverter circuit receives the DC power and converts the DC power to AC power. The detecting unit detects a current harmonic component of the alternating current of the alternating current power source, and generates a current adjusting signal according to the current harmonic component. The control unit is coupled to the inverter circuit and the detection circuit, and the output pulse width modulation signal controls the inverter circuit to convert the DC power source into an AC power source, and generates a canceling current according to the current adjustment signal to superimpose the AC current.

在本發明的一實施例中，上述的控制單元根據疊加抵銷電流後的交流電流來調整脈寬調變信號的工作週期。 In an embodiment of the invention, the control unit adjusts the duty cycle of the pulse width modulation signal according to the alternating current after the offset current is superimposed.

在本發明的一實施例中，上述的偵測單元更判斷電流諧波分量的電流均方根值是否高於預設門檻值，當電流諧波分量的電流均方根值高於預設門檻值時，依據電流諧波分量的電流均方根值與交流電流的電流均方根值之比例產生電流調整信號。 In an embodiment of the invention, the detecting unit further determines whether a current rms value of the current harmonic component is higher than a preset threshold, and when the current rms current of the current harmonic component is higher than a preset threshold At the time of the value, a current adjustment signal is generated according to the ratio of the rms current of the current harmonic component to the rms current of the alternating current.

在本發明的一實施例中，上述的抵銷電流之電流均方根值等於電流諧波分量的電流均方根值。 In an embodiment of the invention, the current rms value of the offset current is equal to the current rms value of the current harmonic component.

在本發明的一實施例中，上述的抵銷電流之頻率等於電流諧波分量之頻率。 In an embodiment of the invention, the frequency of the offset current is equal to the frequency of the current harmonic component.

在本發明的一實施例中，上述的電流諧波分量為奇數階的電流諧波分量。 In an embodiment of the invention, the current harmonic component is an odd-order current harmonic component.

在本發明的一實施例中，上述的偵測單元為整合於控制單元內，或是配置於控制單元外。 In an embodiment of the invention, the detecting unit is integrated in the control unit or disposed outside the control unit.

本發明的逆變裝置的電源轉換方法，逆變裝置用以將直流電源壓轉換為交流電源，逆變裝置的電源轉換方法包括下列步 驟。偵測交流電源的交流電流的電流諧波分量。依據電流諧波分量產生電流調整信號。依據電流調整信號產生抵銷電流，並將抵銷電流疊加至交流電流。根據疊加後的交流電流來調整脈寬調變信號的工作週期。依據脈寬調變信號控制逆變裝置輸出交流電流。 In the power conversion method of the inverter device of the present invention, the inverter device is configured to convert the DC power source voltage into an AC power source, and the power source conversion method of the inverter device includes the following steps Step. Detects the current harmonic component of the AC current of the AC power source. A current adjustment signal is generated based on the current harmonic component. The offset current is generated according to the current adjustment signal, and the offset current is superimposed to the alternating current. The duty cycle of the pulse width modulation signal is adjusted according to the superimposed alternating current. The inverter device outputs an alternating current according to the pulse width modulation signal.

在本發明的一實施例中，上述依據電流諧波分量產生電流調整信號的步驟包括下列步驟。判斷電流諧波分量的電流均方根值是否高於預設門檻值。若電流諧波分量的電流均方根值高於預設門檻值，依據電流諧波分量的電流均方根值與交流電流的電流均方根值之比例產生電流調整信號。 In an embodiment of the invention, the step of generating a current adjustment signal based on the current harmonic component comprises the following steps. Determine whether the current rms value of the current harmonic component is higher than a preset threshold. If the current root mean square value of the current harmonic component is higher than the preset threshold value, the current adjustment signal is generated according to the ratio of the current root mean square value of the current harmonic component to the current root mean square value of the alternating current.

在本發明的一實施例中，上述的抵銷電流之電流均方根值等於電流諧波分量的電流均方根值。 In an embodiment of the invention, the current rms value of the offset current is equal to the current rms value of the current harmonic component.

在本發明的一實施例中，上述的抵銷電流之頻率等於電流諧波分量之頻率。 In an embodiment of the invention, the frequency of the offset current is equal to the frequency of the current harmonic component.

基於上述，本發明的實施例依據偵測到的電流諧波分量調整用於控制逆變電路進行電壓轉換的脈寬調變信號，以產生抵銷電流諧波分量的抵銷電流，而可有效地降低逆變裝置的電流總諧波失真。 Based on the above, the embodiment of the present invention adjusts the pulse width modulation signal for controlling the voltage conversion of the inverter circuit according to the detected current harmonic component to generate a canceling current for canceling the harmonic component of the current, which is effective Ground reduces the total harmonic distortion of the inverter.

為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。 The above described features and advantages of the invention will be apparent from the following description.

102‧‧‧光伏組件 102‧‧‧PV modules

104‧‧‧逆變電路 104‧‧‧Inverter circuit

106‧‧‧偵測單元 106‧‧‧Detection unit

108‧‧‧控制單元 108‧‧‧Control unit

VDC‧‧‧直流電壓 VDC‧‧‧ DC voltage

VAC‧‧‧交流電壓 VAC‧‧‧AC voltage

IDC‧‧‧直流電流 IDC‧‧‧ DC current

IAC‧‧‧交流電流 IAC‧‧‧AC current

S1‧‧‧電流調整信號 S1‧‧‧ current adjustment signal

PWM‧‧‧脈寬調變信號 PWM‧‧‧ pulse width modulation signal

W1、W1'、W2‧‧‧波形 W1, W1', W2‧‧‧ waveforms

S302~S310、S402~S404‧‧‧逆變裝置的電壓轉換方法步驟 S302~S310, S402~S404‧‧‧ Steps for voltage conversion method of inverter

圖1繪示本發明一實施例之逆變裝置使用在光伏系統的示意圖。 FIG. 1 is a schematic diagram of an inverter device used in a photovoltaic system according to an embodiment of the invention.

圖2繪示本發明一實施例之抵銷電流以及交流電流的波形示意圖。 2 is a schematic diagram showing waveforms of offset current and alternating current according to an embodiment of the invention.

圖3繪示本發明一實施例之逆變裝置的電源轉換方法的流程示意圖。 3 is a schematic flow chart of a power conversion method of an inverter device according to an embodiment of the invention.

圖4繪示本發明另一實施例之逆變裝置的電源轉換方法的流程示意圖。 4 is a schematic flow chart of a power conversion method of an inverter device according to another embodiment of the present invention.

圖1繪示本發明一實施例之逆變裝置使用在光伏系統的示意圖。請參照圖1，逆變裝置包括逆變電路104、偵測單元106以及控制單元108，逆變電路104耦接光伏組件102，控制單元108耦接逆變電路104與偵測單元106，偵測單元106耦接逆變電路104的輸出端。光伏組件102可用以將太陽光轉換為直流電源(包含直流電壓VDC與直流電流IDC)，而逆變電路104可接收來自光伏組件102的直流電源，並將其轉換為交流電源(包含交流電壓VAC與交流電流IAC)。進一步來說，逆變電路104中的開關(未繪示)可受控於控制單元108而開啟或關閉，進而將直流電源轉換為交流電源。在本實施例中偵測單元106為配置於控制單元108外，然不以此為限，在其他實施例中，偵測單元106亦可被整合於控制單元108內。 FIG. 1 is a schematic diagram of an inverter device used in a photovoltaic system according to an embodiment of the invention. Referring to FIG. 1 , the inverter device includes an inverter circuit 104 , a detecting unit 106 , and a control unit 108 . The inverter circuit 104 is coupled to the photovoltaic module 102 , and the control unit 108 is coupled to the inverter circuit 104 and the detecting unit 106 . Unit 106 is coupled to the output of inverter circuit 104. The photovoltaic module 102 can be used to convert sunlight into a DC power source (including a DC voltage VDC and a DC current IDC), and the inverter circuit 104 can receive a DC power source from the PV module 102 and convert it to an AC power source (including an AC voltage VAC) With alternating current IAC). Further, a switch (not shown) in the inverter circuit 104 can be turned on or off by the control unit 108 to convert the DC power to an AC power source. In this embodiment, the detecting unit 106 is disposed outside the control unit 108. However, in other embodiments, the detecting unit 106 may be integrated into the control unit 108.

偵測單元106可對逆變電路104輸出的交流電流IAC進行偵測，以獲得交流電流IAC的電流諧波分量，並依據電流諧波分量產生電流調整信號S1給控制單元108，其中電流諧波分量可例如因為逆變電路104停止動作而產生，或因為電壓波形失真、開關切換而產生。進一步來說，偵測單元106產生電流調整信號S1的方式可例如為，先判斷其所偵測到之電流諧波分量的電流均方根值是否高於預設門檻值，當電流諧波分量的電流均方根值高於預設門檻值時，依據電流諧波分量的電流均方根值與交流電流的電流均方根值之比例產生電流調整信號S1。 The detecting unit 106 can detect the alternating current IAC outputted by the inverter circuit 104 to obtain a current harmonic component of the alternating current IAC, and generate a current adjusting signal S1 according to the current harmonic component to the control unit 108, wherein the current harmonic The component may be generated, for example, because the inverter circuit 104 stops operating, or due to voltage waveform distortion, switching, and switching. Further, the detecting unit 106 generates the current adjustment signal S1 by, for example, first determining whether the current rms value of the current harmonic component detected is higher than a preset threshold value, and when the current harmonic component is When the current rms value is higher than the preset threshold value, the current adjustment signal S1 is generated according to the ratio of the current rms value of the current harmonic component to the current rms value of the alternating current.

控制單元108用以輸出脈寬調變信號PWM至逆變電路104，以控制逆變電路104將直流電壓VDC轉換為交流電壓VAC，並可依據偵測單元106所輸出的電流調整信號S1調整脈寬調變信號PWM的工作週期，以產生抵銷電流來抵銷電流諧波分量，亦即控制單元108會依據電流調整信號S1調整脈寬調變信號PWM的工作週期，以將抵銷電流疊加至交流電流IAC，疊加後的交流電流包括交流電流IAC以及抵銷電流，其中疊加後的交流電流中所包含的抵銷電流可用來抵銷電流諧波分量，而使逆變電路104輸出的交流電流IAC的電流諧波分量變小。其中抵銷電流之電流均方根值等於電流諧波分量的電流均方根值，而抵銷電流之頻率等於電流諧波分量之頻率。 The control unit 108 is configured to output a pulse width modulation signal PWM to the inverter circuit 104 to control the inverter circuit 104 to convert the DC voltage VDC into an AC voltage VAC, and adjust the pulse according to the current adjustment signal S1 output by the detecting unit 106. The duty cycle of the wide-tuning signal PWM is generated to offset the current harmonic component, that is, the control unit 108 adjusts the duty cycle of the pulse width modulation signal PWM according to the current adjustment signal S1 to superimpose the offset current. To the alternating current IAC, the superposed alternating current includes an alternating current IAC and a canceling current, wherein the offset current included in the superposed alternating current can be used to offset the current harmonic component, and the alternating current output from the inverter circuit 104 The current harmonic component of the current IAC becomes small. The rms value of the current of the offset current is equal to the rms current of the current harmonic component, and the frequency of the offset current is equal to the frequency of the current harmonic component.

舉例來說，圖2繪示本發明一實施例之抵銷電流以及交流電流的波形示意圖。請參照圖2，在本實施例中，為避免逆變電 路104毀損，控制單元108使操作在邊界傳導模式(boundary conduction mode，BCM)的逆變器在零交越點附近停止動作。在圖2中，波形W1為逆變電路104所輸出的交流電流IAC，正弦波W2為控制單元108依據電流調整信號S1產生的抵銷電流，而波形W1'則為波形W1加上正弦波W2後，亦即交流電流IAC在被注入用以抵消電流諧波分量的抵消電流後所得到的波形(亦即上述疊加後的交流電流的波形)。 For example, FIG. 2 is a schematic diagram showing waveforms of offset current and alternating current according to an embodiment of the invention. Please refer to FIG. 2, in this embodiment, to avoid inverter power The path 104 is broken, and the control unit 108 causes the inverter operating in the boundary conduction mode (BCM) to stop operating near the zero crossing point. In FIG. 2, the waveform W1 is the alternating current IAC outputted by the inverter circuit 104, the sine wave W2 is the offset current generated by the control unit 108 according to the current adjustment signal S1, and the waveform W1' is the waveform W1 plus the sine wave W2. After that, that is, the waveform obtained by the AC current IAC after being applied to cancel the cancellation current of the current harmonic component (that is, the waveform of the superimposed AC current).

在本實例中，交流電流的電流均方根值為1A，電流均方根值的預設門檻值為0.2A，而偵測單元106所偵測到交流電流的電流諧波分量的電流均方根值為0.4A，且交流電流具有階數為3階、頻率為180Hz的電流諧波分量。由於交流電流的電流諧波分量的電流均方根值高於預設門檻值，此時控制單元108便可依據偵測單元106所輸出的電流調整信號S1調整脈寬調變信號PWM的工作週期，產生具有與偵測單元106所偵測到的電流諧波分量相同階數(3階)、相同頻率(180Hz)以及電流均方根值為0.4A的抵消電流(亦即正弦波W2)，以抵消電流諧波分量，進而降低電流總諧波失真。 In this example, the current rms value of the alternating current is 1A, the preset threshold value of the current rms value is 0.2A, and the current mean square of the current harmonic component of the alternating current detected by the detecting unit 106. The root value is 0.4A, and the alternating current has a current harmonic component of order 3 and frequency of 180 Hz. Since the current rms value of the current harmonic component of the alternating current is higher than the preset threshold, the control unit 108 can adjust the duty cycle of the pulse width modulation signal PWM according to the current adjustment signal S1 output by the detecting unit 106. And generating a cancellation current (ie, a sine wave W2) having the same order (3rd order), the same frequency (180Hz), and a current rms value of 0.4A as the current harmonic component detected by the detecting unit 106, To offset the current harmonic components, thereby reducing the current total harmonic distortion.

值得注意的是，本實施例為以電流諧波分量為3階的例子進行抵消電流諧波分量的說明，然電流諧波分量的階數並不以本實施例為限，在其他實施例中，電流諧波分量可為更高的奇數階數(例如：5階、7階...等)，亦可為偶數階的電流諧波分量，且交流電流亦可能同時具有不同階數的電流諧波分量。 It should be noted that, in this embodiment, the description of the current harmonic component is performed by using the current harmonic component as the third order. However, the order of the current harmonic component is not limited to this embodiment. In other embodiments, The current harmonic component can be a higher odd order (for example, 5th order, 7th order, etc.), or an even order current harmonic component, and the alternating current may have different order currents at the same time. Harmonic component.

圖3繪示本發明一實施例之逆變裝置的電源轉換方法的流程示意圖。請參照圖3，由上述實施例可知，逆變裝置的電源轉換方法可包括下列步驟。首先，偵測交流電源的交流電流的電流諧波分量(步驟S302)，其中電流諧波分量可例如為奇數階或偶數階的電流諧波分量。接著，依據電流諧波分量產生電流調整信號(步驟S304)。然後，依據電流調整信號產生抵銷電流，並將抵銷電流疊加至交流電流(步驟S306)。接著，根據疊加後的交流電流來調整脈寬調變信號的工作週期(步驟S308)。最後再依據脈寬調變信號控制逆變裝置輸出的交流電流(步驟S310)，以產生抵銷電流來抵銷電流諧波分量，其中抵銷電流之電流均方根值等於電流諧波分量的電流均方根值，而抵銷電流之頻率等於電流諧波分量之頻率。 3 is a schematic flow chart of a power conversion method of an inverter device according to an embodiment of the invention. Referring to FIG. 3, it can be seen from the above embodiment that the power conversion method of the inverter device may include the following steps. First, a current harmonic component of an alternating current of an alternating current power source is detected (step S302), wherein the current harmonic component may be, for example, an odd-order or even-order current harmonic component. Next, a current adjustment signal is generated in accordance with the current harmonic component (step S304). Then, a cancel current is generated according to the current adjustment signal, and the cancel current is superimposed to the alternating current (step S306). Next, the duty cycle of the pulse width modulation signal is adjusted based on the superimposed alternating current (step S308). Finally, the alternating current outputted by the inverter device is controlled according to the pulse width modulation signal (step S310) to generate a canceling current to offset the current harmonic component, wherein the current rms value of the offset current is equal to the current harmonic component. The current rms value, and the frequency of the offset current is equal to the frequency of the current harmonic component.

圖4繪示本發明一實施例之逆變裝置的電源轉換方法的流程示意圖。請參照圖4，進一步來說，圖3中依據電流諧波分量產生電流調整信號的步驟(步驟S304)可如圖4所示，包括步驟S402與步驟S404。亦即先判斷電流諧波分量的電流均方根值是否高於預設門檻值(步驟S402)，若電流諧波分量的電流均方根值高於預設門檻值，依據電流諧波分量的電流均方根值與交流電流的電流均方根值之比例產生電流調整信號(步驟S404)，然後再進入步驟依據S306，依據電流調整信號產生抵銷電流，並將抵銷電流疊加至交流電流。相反地，若電流諧波分量的電流均方根值未高於預設門檻值，則回到步驟S302，繼續偵測交流電源的交流電流的電 流諧波分量。 4 is a schematic flow chart of a power conversion method of an inverter device according to an embodiment of the present invention. Referring to FIG. 4, further, the step of generating a current adjustment signal according to the current harmonic component in FIG. 3 (step S304) may be as shown in FIG. 4, including steps S402 and S404. That is, it is first determined whether the current rms value of the current harmonic component is higher than a preset threshold value (step S402), if the current rms value of the current harmonic component is higher than a preset threshold value, according to the current harmonic component The ratio of the current rms value to the current rms value of the alternating current generates a current adjustment signal (step S404), and then proceeds to step S306, generating a cancellation current according to the current adjustment signal, and superimposing the offset current to the alternating current . Conversely, if the current rms value of the current harmonic component is not higher than the preset threshold, returning to step S302, continuing to detect the AC current of the AC power source Flow harmonic component.

綜上所述，本發明實施例的控制單元依據交流電流的電流諧波分量產生一抵銷電流諧波分量的抵銷電流，而將抵銷電流疊加至交流電流，並根據疊加後的交流電流調整用於控制逆變電路進行電源轉換的脈寬調變信號，進而有效地降低逆變裝置的電流總諧波失真。 In summary, the control unit of the embodiment of the present invention generates a canceling current that cancels the harmonic component of the current according to the current harmonic component of the alternating current, and superimposes the offset current to the alternating current, and according to the superposed alternating current. The pulse width modulation signal for controlling the power conversion of the inverter circuit is adjusted, thereby effectively reducing the current total harmonic distortion of the inverter device.

S302~S310‧‧‧逆變裝置的電源轉換方法步驟 S302~S310‧‧‧Power conversion method steps of inverter

Claims (9)

一種逆變裝置，包括：一逆變電路，接收一直流電源，並將該直流電源轉換為一交流電源；一偵測單元，偵測該交流電源的交流電流的一電流諧波分量，並依據該電流諧波分量產生一電流調整信號；以及一控制單元，耦接該逆變電路與該偵測單元，輸出一脈寬調變信號控制該逆變電路將該直流電源轉換為該交流電源，依據該電流調整信號產生一抵銷電流以疊加至該交流電流，其中該偵測單元更判斷該電流諧波分量的電流均方根值是否高於一預設門檻值，當該電流諧波分量的電流均方根值高於該預設門檻值時，依據該電流諧波分量的電流均方根值與該交流電流的電流均方根值之比例產生該電流調整信號。 An inverter device includes: an inverter circuit that receives a DC power source and converts the DC power source into an AC power source; and a detecting unit that detects a current harmonic component of the AC current of the AC power source, and according to The current harmonic component generates a current adjustment signal; and a control unit coupled to the inverter circuit and the detection unit, and outputting a pulse width modulation signal to control the inverter circuit to convert the DC power source into the AC power source, And generating, according to the current adjustment signal, a canceling current to be superimposed on the alternating current, wherein the detecting unit further determines whether a current rms value of the current harmonic component is higher than a preset threshold, when the current harmonic component When the current rms value is higher than the preset threshold value, the current adjustment signal is generated according to the ratio of the current rms value of the current harmonic component to the current rms value of the alternating current. 如申請專利範圍第1項所述的逆變裝置，其中該控制單元根據疊加該抵銷電流後的該交流電流來調整該脈寬調變信號的工作週期。 The inverter device of claim 1, wherein the control unit adjusts a duty cycle of the pulse width modulation signal according to the alternating current after the offset current is superimposed. 如申請專利範圍第1項所述的逆變裝置，其中該抵銷電流之電流均方根值等於該電流諧波分量的電流均方根值。 The inverter device of claim 1, wherein the current rms value of the offset current is equal to a current rms value of the current harmonic component. 如申請專利範圍第1項所述的逆變裝置，其中該抵銷電流之頻率等於該電流諧波分量之頻率。 The inverter device of claim 1, wherein the offset current has a frequency equal to a frequency of the current harmonic component. 如申請專利範圍第1項所述的逆變裝置，其中該電流諧波分量為奇數階的電流諧波分量。 The inverter device of claim 1, wherein the current harmonic component is an odd-order current harmonic component. 如申請專利範圍第1項所述的逆變裝置，其中該偵測單元為整合於該控制單元內，或是配置於該控制單元外。 The inverter device of claim 1, wherein the detecting unit is integrated in the control unit or disposed outside the control unit. 一種逆變裝置的電源轉換方法，該逆變裝置用以將一直流電源轉換為一交流電源，該逆變裝置的電源轉換方法包括：偵測該交流電源的交流電流的一電流諧波分量；依據該電流諧波分量產生一電流調整信號；依據該電流調整信號產生一抵銷電流，並將該抵銷電流疊加至該交流電流；根據疊加後的該交流電流來調整一脈寬調變信號的工作週期；以及依據該脈寬調變信號控制該逆變裝置輸出該交流電流，其中依據該電流諧波分量產生該電流調整信號的步驟包括：判斷該電流諧波分量的電流均方根值是否高於一預設門檻值；以及若該電流諧波分量的電流均方根值高於該預設門檻值，依據該電流諧波分量的電流均方根值與該交流電流的電流均方根值之比例產生該電流調整信號。 A power conversion method for an inverter device, wherein the inverter device is configured to convert a DC power source into an AC power source, and the power source conversion method of the inverter device includes: detecting a current harmonic component of the AC current of the AC power source; Generating a current adjustment signal according to the current harmonic component; generating a cancel current according to the current adjustment signal, and superimposing the offset current on the alternating current; adjusting a pulse width modulation signal according to the superposed alternating current And controlling the inverter device to output the alternating current according to the pulse width modulation signal, wherein the step of generating the current adjustment signal according to the current harmonic component comprises: determining a current rms value of the current harmonic component Whether it is higher than a preset threshold value; and if the current rms value of the current harmonic component is higher than the preset threshold value, the current rms value according to the current harmonic component and the current mean square of the alternating current current The ratio of the root values produces the current adjustment signal. 如申請專利範圍第7項所述的逆變裝置的電源轉換方法，其中該抵銷電流之電流均方根值等於該電流諧波分量的電流均方根值。 The power conversion method of the inverter device according to claim 7, wherein the current rms value of the offset current is equal to a current rms value of the current harmonic component. 如申請專利範圍第7項所述的逆變裝置的電源轉換方法，其中該抵銷電流之頻率等於該電流諧波分量之頻率。 The power conversion method of the inverter device according to claim 7, wherein the frequency of the offset current is equal to the frequency of the current harmonic component.
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