TW201534035A - Inverting apparatus and control method thereof - Google Patents

Inverting apparatus and control method thereof Download PDF

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Publication number
TW201534035A
TW201534035A TW104105091A TW104105091A TW201534035A TW 201534035 A TW201534035 A TW 201534035A TW 104105091 A TW104105091 A TW 104105091A TW 104105091 A TW104105091 A TW 104105091A TW 201534035 A TW201534035 A TW 201534035A
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Taiwan
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current
preset
output current
output
capacitance compensation
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TW104105091A
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Chinese (zh)
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TWI535174B (en
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Han-Wei Chen
Chun-Hao Yu
Chia-Hua Liu
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Fsp Technology Inc
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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
    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

An inverting apparatus and a control method thereof are provided. The inverting apparatus includes an inverting circuit, an capacitor, and a control circuit. The inverting circuit receives a direct current (DC) input power and converts the DC input power into an alternative current (AC) output power, where an AC output current of the AC output power presets to a preset output current. The capacitor is coupled to the output terminal of the inverting circuit in parallel. The control circuit is coupled to the inverting circuit and controls power conversion of the inverting circuit. The control circuit adds a preset capacitor compensation current with a phase leading to the preset output current to the preset output current for controlling the inverting circuit to adjust the AC output current, and provides the adjusted AC output current to a power grid.

Description

逆變裝置及其控制方法 Inverter device and control method thereof

本發明是有關於一種電源轉換技術，且特別是有關於一種逆變裝置及其控制方法。 The present invention relates to a power conversion technique, and more particularly to an inverter device and a control method thereof.

一般用於光伏並網系統的逆變裝置中，會在逆變裝置的後端設置一個電磁干擾(EMI)濾波電路與電網連接，所以光伏並網系統利用直流轉交流的逆變裝置將光伏組件的直流電源轉換為交流電源後，會輸出交流電流至EMI濾波電路以進行濾波後提供給電網。 Generally, in an inverter device for a photovoltaic grid-connected system, an electromagnetic interference (EMI) filter circuit is connected to the grid at the rear end of the inverter device, so the photovoltaic grid-connected system uses a DC-to-AC inverter device to connect the photovoltaic module. After the DC power is converted to AC power, the AC current is output to the EMI filter circuit for filtering and then supplied to the grid.

所述EMI濾波電路通常會設置有一安規電容(即，X電容)來進行濾波。然而，此安規電容雖可濾除高頻的電磁干擾，但同時也可能造成逆變裝置所輸出的交流電流其中有部分被安規電容所消耗(即，安規電容的虛部電流)，從而造成電網所接收到的交流電流與逆變裝置所輸出的交流電流的振幅/相位不匹配，導致逆變裝置的功率因數降低。 The EMI filter circuit is typically provided with a safety capacitor (ie, an X capacitor) for filtering. However, although this safety capacitor can filter out high-frequency electromagnetic interference, it may also cause some of the AC current output by the inverter device to be consumed by the safety capacitor (ie, the imaginary current of the safety capacitor), thereby causing the grid. The received AC current does not match the amplitude/phase of the AC current output by the inverter, resulting in a decrease in the power factor of the inverter.

本發明提供一種逆變裝置及其控制方法，其可補償安規電容所造成的電流損耗(虛功)，從而提高逆變裝置的功率因數。 The invention provides an inverter device and a control method thereof, which can compensate current loss (virtual work) caused by a safety capacitor, thereby improving a power factor of the inverter device.

本發明的逆變裝置包括逆變電路、電容以及控制電路。逆變電路接收直流輸入電源，用以將直流輸入電源轉換為交流輸出電源，其中交流輸出電源的交流輸出電流預設為預設輸出電流。電容並接於逆變電路的輸出端。控制電路耦接逆變電路，用以控制逆變電路的電源轉換。控制電路將相位超前於預設輸出電流的預設電容補償電流疊加至預設輸出電流，藉以控制逆變電路調整交流輸出電流，並且將調整後的交流輸出電流提供給電網。 The inverter device of the present invention includes an inverter circuit, a capacitor, and a control circuit. The inverter circuit receives the DC input power for converting the DC input power into an AC output power, wherein the AC output current of the AC output power is preset to a preset output current. The capacitor is connected to the output of the inverter circuit. The control circuit is coupled to the inverter circuit for controlling power conversion of the inverter circuit. The control circuit superimposes the preset capacitance compensation current whose phase is ahead of the preset output current to the preset output current, thereby controlling the inverter circuit to adjust the AC output current, and providing the adjusted AC output current to the grid.

在本發明一實施例中，預設電容補償電流係依據逆變電路的工作頻率與電容的電容值所決定。 In an embodiment of the invention, the preset capacitance compensation current is determined according to the operating frequency of the inverter circuit and the capacitance value of the capacitor.

在本發明一實施例中，預設電容補償電流的相位實質上超前預設輸出電流90度，並且與流經電容的電流實質上具有相同的振幅。 In an embodiment of the invention, the phase of the predetermined capacitance compensation current substantially exceeds the preset output current by 90 degrees and has substantially the same amplitude as the current flowing through the capacitor.

在本發明一實施例中，電網所接收到的交流輸出電流實質上等同於預設輸出電流。 In an embodiment of the invention, the AC output current received by the power grid is substantially equivalent to the preset output current.

在本發明一實施例中，控制電路包括第一訊號產生器、第二訊號產生器、加法器以及控制器。第一訊號產生器用以儲存對應於預設輸出電流的相位特性的第一查找表，並且依據第一查找表產生指示預設輸出電流的第一電流訊號。第二暫存器用以儲存對應於預設電容補償電流的相位特性的第二查找表與指示預設 電容補償電流的振幅強度的電流命令，並且依據第二查找表與電流命令產生指示預設電容補償電流的第二電流訊號。加法器接收第一電流訊號與第二電流訊號，藉以產生指示預設輸出電流與預設電容補償電流之疊加的參考電流。控制器耦接加法器與逆變電路，並且取樣交流輸出電流。控制器比較交流輸出電流與參考電流，以產生相應的控制訊號來控制逆變電路的開關責任周期，藉以將交流輸出電流的波形調整為參考電流的波形。 In an embodiment of the invention, the control circuit includes a first signal generator, a second signal generator, an adder, and a controller. The first signal generator is configured to store a first lookup table corresponding to a phase characteristic of the preset output current, and generate a first current signal indicating the preset output current according to the first lookup table. The second register is configured to store a second lookup table and an indication preset corresponding to a phase characteristic of the preset capacitance compensation current The capacitor compensates for the current command of the amplitude intensity of the current, and generates a second current signal indicative of the preset capacitance compensation current in accordance with the second lookup table and the current command. The adder receives the first current signal and the second current signal to generate a reference current indicating a superposition of the preset output current and the preset capacitance compensation current. The controller is coupled to the adder and the inverter circuit, and samples the AC output current. The controller compares the AC output current with the reference current to generate a corresponding control signal to control the switching duty cycle of the inverter circuit, thereby adjusting the waveform of the AC output current to the waveform of the reference current.

本發明的逆變裝置的控制方法包括以下步驟：接收直流輸入電源；將直流輸入電源轉換為交流輸出電源，其中交流輸出電源的交流輸出電流預設為預設輸出電流；將調整後的交流輸出電流提供給電網。 The control method of the inverter device of the present invention comprises the steps of: receiving a DC input power; converting the DC input power into an AC output power, wherein the AC output current of the AC output power is preset to a preset output current; and the adjusted AC output is to be adjusted. Current is supplied to the grid.

在本發明一實施例中，藉控制電路將相位超前於預設輸出電流的預設電容補償電流疊加至預設輸出電流，藉以控制逆變電路調整交流輸出電流的步驟包括：依據第一查找表產生指示預設輸出電流的第一電流訊號，其中第一查找表指示預設輸出電流的相位特性；依據第二查找表與電流命令產生指示預設電容補償電流的第二電流訊號，其中第二查找表指示預設電容補償電流的相位特性並且電流命令指示預設電容補償電流的振幅強度；以及依據第一電流訊號與第二電流訊號產生指示預設輸出電流與預設電容補償電流之疊加的參考電流。 In an embodiment of the invention, the step of controlling the inverter circuit to adjust the AC output current by the control circuit superimposing the preset capacitance compensation current whose phase is ahead of the preset output current to the preset output current comprises: according to the first lookup table Generating a first current signal indicating a preset output current, wherein the first lookup table indicates a phase characteristic of the preset output current; generating a second current signal indicating the preset capacitance compensation current according to the second lookup table and the current command, wherein the second The lookup table indicates a phase characteristic of the preset capacitance compensation current and the current command indicates an amplitude intensity of the preset capacitance compensation current; and the superposition of the preset output current and the preset capacitance compensation current according to the first current signal and the second current signal generation Reference current.

在本發明一實施例中，藉控制電路將相位超前於預設輸出電流的預設電容補償電流疊加至預設輸出電流，藉以控制逆變 電路調整交流輸出電流的步驟更包括：比較交流輸出電流與參考電流，據以產生控制訊號；以及以控制訊號控制逆變電路的開關責任週期，藉以控制逆變電路將交流輸出電流的波形調整為參考電流的波形。 In an embodiment of the invention, the control circuit superimposes the preset capacitance compensation current whose phase is ahead of the preset output current to the preset output current, thereby controlling the inverter The step of adjusting the AC output current of the circuit further comprises: comparing the AC output current with the reference current to generate a control signal; and controlling the switching duty cycle of the inverter circuit by the control signal, thereby controlling the inverter circuit to adjust the waveform of the AC output current to The waveform of the reference current.

基於上述，本發明實施例提出一種逆變裝置及其控制方法。所述逆變裝置可藉由提供包含有預設輸出電流成分與預設電容補償電流成分的交流輸出電流給後端的電網，其中預設電容補償電流可用來補償安規電容的虛部電流，使得電網實際接收到的交流輸出電流可實質上等同於預設輸出電流，進而提高逆變電路的功率因數。 Based on the above, an embodiment of the present invention provides an inverter device and a control method thereof. The inverter device can provide an AC output current including a preset output current component and a preset capacitor compensation current component to the power grid of the back end, wherein the preset capacitor compensation current can be used to compensate the imaginary current of the safety capacitor, so that the power grid The actually received AC output current can be substantially equivalent to the preset output current, thereby increasing the power factor of the inverter circuit.

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.

100‧‧‧逆變裝置 100‧‧‧Inverter

110‧‧‧逆變電路 110‧‧‧Inverter circuit

120‧‧‧電容 120‧‧‧ Capacitance

130‧‧‧控制電路 130‧‧‧Control circuit

132、134‧‧‧訊號產生器 132, 134‧‧‧ signal generator

136‧‧‧加法器 136‧‧‧Adder

138‧‧‧控制器 138‧‧‧ Controller

ACout‧‧‧交流輸出電源 ACout‧‧‧AC output power supply

C‧‧‧控制訊號 C‧‧‧Control signal

DCin‧‧‧直流輸入電源 DCin‧‧‧DC input power supply

CF‧‧‧電流命令 CF‧‧‧current command

EG‧‧‧電網 EG‧‧‧ grid

Iin‧‧‧直流輸入電流 Iin‧‧‧DC input current

Icx‧‧‧虛部電流 Icx‧‧‧ imaginary current

Icx’‧‧‧預設電容補償電流 Icx’‧‧‧Preset Capacitor Compensation Current

Io’‧‧‧交流輸出電流 Io’‧‧‧ AC output current

Io‧‧‧預設輸出電流 Io‧‧‧Preset output current

IREF‧‧‧參考電流 IREF‧‧‧reference current

LT1、LT2‧‧‧查找表 LT1, LT2‧‧‧ lookup table

Si1、Si2‧‧‧電流訊號 Si1, Si2‧‧‧ current signal

S210~S240、S231~S234‧‧‧步驟 S210~S240, S231~S234‧‧‧ steps

VAC‧‧‧交流輸出電壓 V AC ‧‧‧AC output voltage

Vin‧‧‧直流輸入電壓 Vin‧‧‧DC input voltage

圖1為本發明一實施例的逆變裝置的示意圖。 FIG. 1 is a schematic diagram of an inverter device according to an embodiment of the present invention.

圖2為本發明一實施例的交流輸出電流的電流波形圖。 2 is a current waveform diagram of an alternating current output current according to an embodiment of the present invention.

圖3為本發明一實施例的控制電路的示意圖。 3 is a schematic diagram of a control circuit in accordance with an embodiment of the present invention.

圖4為本發明一實施例的逆變裝置的控制方法的步驟流程圖。 4 is a flow chart showing the steps of a method for controlling an inverter device according to an embodiment of the present invention.

圖5為本發明另一實施例的逆變裝置的控制方法的步驟流程圖。 FIG. 5 is a flow chart showing the steps of a method for controlling an inverter device according to another embodiment of the present invention.

為了使本揭露之內容可以被更容易明瞭，以下特舉實施例做為本揭露確實能夠據以實施的範例。另外，凡可能之處，在圖式及實施方式中使用相同標號的元件/構件/步驟，係代表相同或類似部件。 In order to make the disclosure of the present disclosure easier to understand, the following specific embodiments are examples of the disclosure that can be implemented. In addition, wherever possible, the same elements, components, and steps in the drawings and embodiments are used to represent the same or similar components.

圖1為本發明一實施例的逆變裝置的示意圖。請參照圖1，本實施例的逆變裝置100可應用於光伏並網系統(未繪示)中。逆變裝置100可從前端的光伏組件(photovoltaic module，未繪示)接收直流輸入電源DCin(包括直流輸入電壓Vin與直流輸入電流Iin)，並且將所接收的直流輸入電源DCin轉換為交流輸出電源ACout(包括交流輸出電壓VAC與交流輸出電流Io’)給後端的電網EG。 FIG. 1 is a schematic diagram of an inverter device according to an embodiment of the present invention. Referring to FIG. 1, the inverter device 100 of the present embodiment can be applied to a photovoltaic grid-connected system (not shown). The inverter device 100 can receive a DC input power source DCin (including a DC input voltage Vin and a DC input current Iin) from a front-end photovoltaic module (not shown), and convert the received DC input power source DCin into an AC output power source. ACout (including AC output voltage V AC and AC output current Io') is given to the back end of the grid EG.

具體而言，逆變裝置100包括逆變電路110、電容120以及控制電路130。逆變電路110接收直流輸入電源DCin，並且用以將直流輸入電源DCin轉換為交流輸出電源ACout。其中，所述逆變電路110的電路組態可例如為半橋非對稱式、半橋對稱式、全橋式或其他可行的逆變電路組態，本發明不對此加以限制。另外，本實施例之電容120可為一安規電容(例如：X電容)或其他類型之電容。 Specifically, the inverter device 100 includes an inverter circuit 110, a capacitor 120, and a control circuit 130. The inverter circuit 110 receives the DC input power source DCin and converts the DC input power source DCin into an AC output power source ACout. The circuit configuration of the inverter circuit 110 can be, for example, a half bridge asymmetric, a half bridge symmetric, a full bridge or other feasible inverter circuit configuration, which is not limited by the present invention. In addition, the capacitor 120 of this embodiment may be a safety capacitor (eg, X capacitor) or other type of capacitor.

電容120並接於逆變裝置100的輸出端，其可作為高頻放電路徑，藉以濾除交流輸出電源ACout中可能存在的雜訊。控制電路130耦接逆變電路110，用以控制逆變電路110的電源轉 換，所述控制訊號C可例如為用以控制逆變電路110的切換週期的一脈寬調變訊號(PWM signal)，但本發明不以此為限。 The capacitor 120 is connected to the output end of the inverter device 100, and can be used as a high-frequency discharge path to filter out noise that may exist in the AC output power ACout. The control circuit 130 is coupled to the inverter circuit 110 for controlling the power conversion of the inverter circuit 110. For example, the control signal C can be, for example, a PWM signal for controlling the switching period of the inverter circuit 110, but the invention is not limited thereto.

詳細而言，在逆變電路110進行電源轉換的期間，控制電路130會產生控制訊號C來控制逆變電路110的開關責任週期，藉以控制逆變電路110所產生交流輸出電源ACout中的交流輸出電流Io’的大小。在本實施例中，控制電路130會藉由調變控制訊號C來將相位超前於預設輸出電流Io的預設電容補償電流Icx’疊加至預設輸出電流Io上，藉以控制逆變電路110調整交流輸出電流Io’，並且將調整後的交流輸出電流Io’提供給後端的電網EG。其中，調整後的交流輸出電流Io’可以下式表示：Io’=Io+Icx’ (1) In detail, during the power conversion of the inverter circuit 110, the control circuit 130 generates a control signal C to control the switching duty cycle of the inverter circuit 110, thereby controlling the AC output in the AC output power ACout generated by the inverter circuit 110. The magnitude of the current Io'. In this embodiment, the control circuit 130 superimposes the preset capacitance compensation current Icx′ whose phase is ahead of the preset output current Io to the preset output current Io by the modulation control signal C, thereby controlling the inverter circuit 110. The AC output current Io' is adjusted, and the adjusted AC output current Io' is supplied to the power grid EG at the back end. Wherein, the adjusted AC output current Io' can be expressed by the following formula: Io'=Io+Icx' (1)

在本實施例中，疊加至預設輸出電流Io的預設電容補償電流Icx’的大小是依據逆變電路110的工作頻率與電容120的電容值所決定。換言之，設計者可預先地依據逆變電路110的工作頻率與電容120的電容值計算出流經電容120的虛部電流Icx的振幅，再依據所述虛部電流Icx設定對應的控制訊號C，藉以疊加對應於虛部電流Icx的預設電容補償電流Icx’至逆變電路110的預設輸出電流Io上。 In the present embodiment, the magnitude of the preset capacitance compensation current Icx' superimposed to the preset output current Io is determined according to the operating frequency of the inverter circuit 110 and the capacitance value of the capacitor 120. In other words, the designer can calculate the amplitude of the imaginary part current Icx flowing through the capacitor 120 according to the operating frequency of the inverter circuit 110 and the capacitance value of the capacitor 120, and then set the corresponding control signal C according to the imaginary part current Icx. The preset capacitance compensation current Icx' corresponding to the imaginary part current Icx is superimposed on the preset output current Io of the inverter circuit 110.

更具體地說，預設輸出電流Io與預設電容補償電流Icx’的波形可如圖2所示。其中，預設輸出電流Io與預設電容補償電流Icx’分別具有弦波形式。此外，所計算出的預設電容補償電流Icx’會設計為與流經電容120的虛部電流Icx具有相同相位與振 幅。換言之，預設電容補償電流Icx’的相位實質上會超前預設輸出電流Io約90度。 More specifically, the waveform of the preset output current Io and the preset capacitance compensation current Icx' can be as shown in FIG. The preset output current Io and the preset capacitance compensation current Icx' respectively have a sine wave form. In addition, the calculated preset capacitance compensation current Icx' is designed to have the same phase and vibration as the imaginary current Icx flowing through the capacitor 120. Width. In other words, the phase of the preset capacitance compensation current Icx' will substantially exceed the preset output current Io by about 90 degrees.

藉由提供包含有預設輸出電流Io成分與預設電容補償電流Icx’成分的交流輸出電流Io’，其中預設電容補償電流Icx’可用來補償電容120的虛部電流Icx，使得電網EG實際接收到的交流輸出電流Io’可實質上等同於預設輸出電流Io，進而提高逆變電路110的功率因數。其中，電網EG實際接收到的交流輸出電流Io’可以下式表示：Io’=Io+Icx’-Icx (2) By providing an AC output current Io' including a preset output current Io component and a preset capacitance compensation current Icx' component, wherein the preset capacitance compensation current Icx' can be used to compensate the imaginary part current Icx of the capacitor 120, so that the grid EG is actually The received AC output current Io' may be substantially equivalent to the preset output current Io, thereby increasing the power factor of the inverter circuit 110. The AC output current Io' actually received by the grid EG can be expressed by the following formula: Io'=Io+Icx'-Icx (2)

為了更具體地說明控制電路130如何控制逆變電路110產生包含有預設輸出電流Io成分與預設電容補償電流Icx’成分的交流輸出電流Io’，底下以圖3來說明控制電路130的具體實施範例。其中，圖3為本發明一實施例的控制電路的示意圖。 To more specifically describe how the control circuit 130 controls the inverter circuit 110 to generate an AC output current Io' including a predetermined output current Io component and a preset capacitance compensation current Icx' component, the specific description of the control circuit 130 will be described below with reference to FIG. Implementation examples. FIG. 3 is a schematic diagram of a control circuit according to an embodiment of the present invention.

請參照圖3，在本實施例中，控制電路130包括訊號產生器132與134、加法器136以及控制器138。訊號產生器132用以儲存對應於預設輸出電流Io的相位特性的查找表LT1，並且訊號產生器134用以儲存對應於預設電容補償電流Icx’的相位特性的查找表LT2與電流命令CF。其中，所述查找表LT1可例如包含預設輸出電流Io在不同時間點下的電流大小資訊，而所述查找表LT2可例如包含預設電容補償電流Icx’在不同時間點下的單位電流大小資訊。而所述電流命令CF是指示預設電容補償電流Icx’的振幅強度，其可依據逆變電路110的工作頻率與電容120的電容值來 設定。 Referring to FIG. 3, in the present embodiment, the control circuit 130 includes signal generators 132 and 134, an adder 136, and a controller 138. The signal generator 132 is configured to store a lookup table LT1 corresponding to the phase characteristic of the preset output current Io, and the signal generator 134 is configured to store a lookup table LT2 and a current command CF corresponding to the phase characteristics of the preset capacitance compensation current Icx′. . The lookup table LT1 may include, for example, current size information of the preset output current Io at different time points, and the lookup table LT2 may include, for example, a unit current of the preset capacitance compensation current Icx′ at different time points. News. The current command CF is indicative of the amplitude strength of the preset capacitance compensation current Icx', which may be based on the operating frequency of the inverter circuit 110 and the capacitance value of the capacitor 120. set up.

在本實施例中，訊號產生器132會依據查找表LT1產生指示預設輸出電流Io的電流訊號Si1，並且訊號產生器134會依據查找表LT2與電流命令CF產生指示預設電容補償電流Icx’的電流訊號Si2。 In this embodiment, the signal generator 132 generates a current signal Si1 indicating the preset output current Io according to the lookup table LT1, and the signal generator 134 generates a preset capacitance compensation current Icx' according to the lookup table LT2 and the current command CF. Current signal Si2.

加法器136耦接訊號產生器132與134，用以接收訊號產生器132與134所產生的電流訊號Si1與Si2，藉以將預設輸出電流Io與預設電容補償電流Icx’疊加在一起，並產生指示預設輸出電流Io與預設電容補償電流Icx’之疊加的參考電流IREF。 The adder 136 is coupled to the signal generators 132 and 134 for receiving the current signals Si1 and Si2 generated by the signal generators 132 and 134, thereby superimposing the preset output current Io and the preset capacitance compensation current Icx'. A reference current IREF indicating a superposition of the preset output current Io and the preset capacitance compensation current Icx' is generated.

控制器138耦接加法器136與逆變電路110的輸出端，以接收參考電流IREF並且取樣交流輸出電流Io’。其中，控制器138會比較交流輸出電流Io’與參考電流IREF，以產生相應的控制訊號C來控制逆變電路110的開關責任周期，藉以將交流輸出電流Io’的波形調整為參考電流IREF的波形。 The controller 138 is coupled to the adder 136 and the output of the inverter circuit 110 to receive the reference current IREF and sample the AC output current Io'. The controller 138 compares the AC output current Io' with the reference current IREF to generate a corresponding control signal C to control the switching duty cycle of the inverter circuit 110, thereby adjusting the waveform of the AC output current Io' to the reference current IREF. Waveform.

圖4為本發明一實施例的逆變裝置的控制方法的步驟流程圖。所述控制方法可應用於如圖1或圖3所繪示的逆變裝置100與控制電路130(但不僅限於此)。所述控制方法包括以下步驟：首先，逆變電路110會接收直流輸入電源DCin(步驟S210)；藉逆變電路110將直流輸入電源DCin轉換為交流輸出電源ACout，其中交流輸出電源ACout中的交流輸出電流Io’預設為預設輸出電流Io(步驟S220)；在逆變電路110運作的過程中，控制電路130會將相位超前於預設輸出電流Io的預設電容補償電流Icx’疊加至 預設輸出電流Io上，藉以控制逆變電路110調整交流輸出電流Io’(步驟S230)；以及將調整後的交流輸出電流Io’提供給後端的電網(步驟S240)。 4 is a flow chart showing the steps of a method for controlling an inverter device according to an embodiment of the present invention. The control method can be applied to (but not limited to) the inverter device 100 and the control circuit 130 as illustrated in FIG. 1 or FIG. 3 . The control method includes the following steps: First, the inverter circuit 110 receives the DC input power DCin (step S210); and the inverter circuit 110 converts the DC input power DCin into an AC output power ACout, wherein the AC output AC outlet AC The output current Io' is preset to a preset output current Io (step S220); during the operation of the inverter circuit 110, the control circuit 130 superimposes the preset capacitance compensation current Icx' whose phase is ahead of the preset output current Io to The output current Io is preset to control the inverter circuit 110 to adjust the AC output current Io' (step S230); and the adjusted AC output current Io' is supplied to the power grid of the back end (step S240).

更具體地說，請參照圖5，在本實施例的控制逆變電路110調整交流輸出電流Io’的動作中(步驟S230)，其具體控制步驟流程如下：依據第一查找表(如LT1)產生指示預設輸出電流Io的電流訊號Si1(步驟S231)；依據第二查找表(如LT2)與電流命令CF產生指示預設電容補償電流Icx’的第二電流訊號Si2(步驟S232)；依據第一電流訊號Si1與第二電流訊號Si2產生指示預設輸出電流Io與預設電容補償電流Icx’之疊加的參考電流IREF(步驟S233)；比較交流輸出電流Io’與參考電流IREF，據以產生控制訊號C(步驟S234)；以及以控制訊號C控制逆變電路(如110)的開關責任週期，藉以控制逆變電路將交流輸出電流Io’的波形調整為參考電流IREF的波形(步驟S235)。 More specifically, referring to FIG. 5, in the action of controlling the inverter circuit 110 to adjust the AC output current Io' (step S230), the specific control procedure is as follows: according to the first lookup table (such as LT1) Generating a current signal Si1 indicating the preset output current Io (step S231); generating a second current signal Si2 indicating the preset capacitance compensation current Icx' according to the second lookup table (eg, LT2) and the current command CF (step S232); The first current signal Si1 and the second current signal Si2 generate a reference current IREF indicating a superposition of the preset output current Io and the preset capacitance compensation current Icx' (step S233); comparing the alternating current output current Io' with the reference current IREF, The control signal C is generated (step S234); and the switching duty cycle of the inverter circuit (such as 110) is controlled by the control signal C, thereby controlling the inverter circuit to adjust the waveform of the AC output current Io' to the waveform of the reference current IREF (step S235) ).

其中，圖4與圖5實施例所述之控制方法可根據前述圖1至圖3的說明而獲得充足的支持與教示，故相似或重複之處於此不再贅述。 The control method described in the embodiment of FIG. 4 and FIG. 5 can obtain sufficient support and teaching according to the foregoing description of FIG. 1 to FIG. 3, and thus similarities or repetitions are not described herein again.

綜上所述，本發明實施例提出一種逆變裝置及其控制方法。所述逆變裝置可藉由提供包含有預設輸出電流成分與預設電容補償電流成分的交流輸出電流給後端的電網，其中預設電容補償電流可用來補償安規電容的虛部電流，使得電網實際接收到的交流輸出電流可實質上等同於預設輸出電流，進而提高逆變電路 的功率因數。 In summary, the embodiment of the invention provides an inverter device and a control method thereof. The inverter device can provide an AC output current including a preset output current component and a preset capacitor compensation current component to the power grid of the back end, wherein the preset capacitor compensation current can be used to compensate the imaginary current of the safety capacitor, so that the power grid The actually received AC output current can be substantially equivalent to the preset output current, thereby improving the inverter circuit Power factor.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。 Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧逆變裝置 100‧‧‧Inverter

110‧‧‧逆變電路 110‧‧‧Inverter circuit

120‧‧‧電容 120‧‧‧ Capacitance

130‧‧‧控制電路 130‧‧‧Control circuit

ACout‧‧‧交流輸出電源 ACout‧‧‧AC output power supply

C‧‧‧控制訊號 C‧‧‧Control signal

DCin‧‧‧直流輸入電源 DCin‧‧‧DC input power supply

EG‧‧‧電網 EG‧‧‧ grid

Iin‧‧‧直流輸入電流 Iin‧‧‧DC input current

Icx‧‧‧虛部電流 Icx‧‧‧ imaginary current

Icx’‧‧‧預設電容補償電流 Icx’‧‧‧Preset Capacitor Compensation Current

Io’‧‧‧交流輸出電流 Io’‧‧‧ AC output current

Io‧‧‧預設輸出電流 Io‧‧‧Preset output current

Vin‧‧‧直流輸入電壓 Vin‧‧‧DC input voltage

VAC‧‧‧交流輸出電壓 V AC ‧‧‧AC output voltage

Claims (11)

一種逆變裝置，包括：一逆變電路，接收一直流輸入電源，用以將該直流輸入電源轉換為一交流輸出電源，其中該交流輸出電源的交流輸出電流預設為一預設輸出電流；一電容，並接於該逆變電路的輸出端；以及一控制電路，耦接該逆變電路，用以控制該逆變電路的電源轉換，其中該控制電路將一相位超前於該預設輸出電流的預設電容補償電流疊加至該預設輸出電流，藉以控制該逆變電路調整該交流輸出電流，並且將調整後的交流輸出電流提供給一電網。 An inverter device includes: an inverter circuit that receives a DC input power source for converting the DC input power source into an AC output power source, wherein an AC output current of the AC output power source is preset to a preset output current; a capacitor connected to the output end of the inverter circuit; and a control circuit coupled to the inverter circuit for controlling power conversion of the inverter circuit, wherein the control circuit leads a phase ahead of the preset output A preset capacitance compensation current of the current is superimposed on the preset output current, thereby controlling the inverter circuit to adjust the AC output current, and supplying the adjusted AC output current to a power grid. 如申請專利範圍第1項所述的逆變裝置，其中該預設電容補償電流係依據該逆變電路的工作頻率與該電容的電容值所決定。 The inverter device of claim 1, wherein the preset capacitance compensation current is determined according to an operating frequency of the inverter circuit and a capacitance value of the capacitor. 如申請專利範圍第1項所述的逆變裝置，其中該預設電容補償電流的相位實質上超前該預設輸出電流90度，並且與流經該電容的電流實質上具有相同的振幅。 The inverter device of claim 1, wherein the phase of the preset capacitance compensation current substantially advances the preset output current by 90 degrees and has substantially the same amplitude as the current flowing through the capacitor. 如申請專利範圍第1項所述的逆變裝置，其中該電網所接收到的交流輸出電流實質上等同於該預設輸出電流。 The inverter device of claim 1, wherein the AC output current received by the power grid is substantially equal to the preset output current. 如申請專利範圍第1項所述的逆變裝置，其中該控制電路包括：一第一訊號產生器，用以儲存對應於該預設輸出電流的相位特性的一第一查找表，並且依據該第一查找表產生指示該預設輸 出電流的一第一電流訊號；一第二訊號產生器，用以儲存對應於該預設電容補償電流的相位特性的一第二查找表與指示該預設電容補償電流的振幅強度的一電流命令，並且依據該第二查找表與該電流命令產生指示該預設電容補償電流的一第二電流訊號；；一加法器，接收該第一電流訊號與該第二電流訊號，藉以產生指示該預設輸出電流與該預設電容補償電流之疊加的一參考電流；以及一控制器，耦接該加法器與該逆變電路，並且取樣該交流輸出電流，其中該控制器比較該交流輸出電流與該參考電流，以產生一相應的控制訊號來控制該逆變電路的一開關責任周期，藉以將該交流輸出電流的波形調整為該參考電流的波形。 The inverter device of claim 1, wherein the control circuit comprises: a first signal generator for storing a first lookup table corresponding to a phase characteristic of the preset output current, and according to the The first lookup table generates an indication of the preset input a first current signal for outputting current; a second signal generator for storing a second lookup table corresponding to a phase characteristic of the preset capacitance compensation current and a current indicating an amplitude strength of the preset capacitance compensation current Commanding, and generating a second current signal indicating the preset capacitance compensation current according to the second lookup table and the current command; and an adder receiving the first current signal and the second current signal to generate the indication a reference current of a preset output current and a preset capacitance compensation current; and a controller coupled to the adder and the inverter circuit, and sampling the AC output current, wherein the controller compares the AC output current And the reference current is used to generate a corresponding control signal to control a switching duty cycle of the inverter circuit, thereby adjusting the waveform of the AC output current to a waveform of the reference current. 一種逆變裝置的控制方法，其中該逆變裝置包括一逆變電路、一電容以及一控制電路，該控制方法包括：接收一直流輸入電源；將該直流輸入電源轉換為一交流輸出電源，其中該交流輸出電源的交流輸出電流預設為一預設輸出電流；藉該控制電路將一相位超前於該預設輸出電流的預設電容補償電流疊加至該預設輸出電流，藉以控制該逆變電路調整該交流輸出電流；以及將調整後的交流輸出電流提供給一電網。 A control method of an inverter device, wherein the inverter device comprises an inverter circuit, a capacitor and a control circuit, the control method comprises: receiving a DC input power source; converting the DC input power source into an AC output power source, wherein The AC output current of the AC output power source is preset to a preset output current; the control circuit superimposes a preset capacitance compensation current of a phase ahead of the preset output current to the preset output current, thereby controlling the inverter The circuit adjusts the AC output current; and provides the adjusted AC output current to a power grid. 如申請專利範圍第6項所述的逆變裝置的控制方法，其中 該預設電容補償電流係依據該逆變電路的工作頻率與該電容的電容值所決定。 The control method of the inverter device according to claim 6, wherein The preset capacitance compensation current is determined according to the operating frequency of the inverter circuit and the capacitance value of the capacitor. 如申請專利範圍第6項所述的逆變裝置的控制方法，其中該預設電容補償電流的相位實質上超前該預設輸出電流90度，並且與流經該電容的電流實質上具有相同的振幅。 The control method of the inverter device according to claim 6, wherein the phase of the preset capacitor compensation current substantially advances the preset output current by 90 degrees, and has substantially the same current as the current flowing through the capacitor. amplitude. 如申請專利範圍第6項所述的逆變裝置的控制方法，其中該電網所接收到的交流輸出電流實質上等同於該預設輸出電流。 The control method of the inverter device according to claim 6, wherein the AC output current received by the power grid is substantially equal to the preset output current. 如申請專利範圍第6項所述的逆變裝置的控制方法，其中藉該控制電路將該相位超前於該預設輸出電流的預設電容補償電流疊加至該預設輸出電流，藉以控制該逆變電路調整該交流輸出電流的步驟包括：依據一第一查找表產生指示該預設輸出電流的一第一電流訊號，其中該第一查找表指示該預設輸出電流的相位特性；依據一第二查找表與一電流命令產生指示該預設電容補償電流的一第二電流訊號，其中該第二查找表指示該預設電容補償電流的相位特性並且該電流命令指示該預設電容補償電流的振幅強度；以及依據該第一電流訊號與該第二電流訊號產生指示該預設輸出電流與該預設電容補償電流之疊加的一參考電流。 The control method of the inverter device according to claim 6, wherein the control circuit superimposes the preset capacitance compensation current whose phase is ahead of the preset output current to the preset output current, thereby controlling the inverse The step of adjusting the AC output current by the variable circuit includes: generating a first current signal indicating the preset output current according to a first lookup table, wherein the first lookup table indicates a phase characteristic of the preset output current; The second lookup table and a current command generate a second current signal indicating the preset capacitance compensation current, wherein the second lookup table indicates a phase characteristic of the preset capacitance compensation current and the current command indicates the preset capacitance compensation current An amplitude intensity; and generating a reference current indicating the superposition of the preset output current and the preset capacitance compensation current according to the first current signal and the second current signal. 如申請專利範圍第10項所數的逆變裝置的控制方法，其中藉該控制電路將該相位超前於該預設輸出電流的預設電容補償電流疊加至該預設輸出電流，藉以控制該逆變電路調整該交流輸 出電流的步驟更包括：比較該交流輸出電流與該參考電流，據以依據該參考電流產生一控制訊號；以及以該控制訊號控制該逆變電路的一開關責任週期，藉以控制該逆變電路將該交流輸出電流的波形調整為該參考電流的波形。 The control method of the inverter device according to claim 10, wherein the control circuit superimposes a preset capacitance compensation current whose phase is ahead of the preset output current to the preset output current, thereby controlling the inverse Variable circuit to adjust the AC input The step of outputting current includes: comparing the AC output current with the reference current to generate a control signal according to the reference current; and controlling a switching duty cycle of the inverter circuit by the control signal, thereby controlling the inverter circuit The waveform of the AC output current is adjusted to the waveform of the reference current.
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