TWI574142B - Two path maximum power point tracking off-grid solar inverter apparatus and control method thereof - Google Patents

Two path maximum power point tracking off-grid solar inverter apparatus and control method thereof Download PDF

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TWI574142B
TWI574142B TW104132522A TW104132522A TWI574142B TW I574142 B TWI574142 B TW I574142B TW 104132522 A TW104132522 A TW 104132522A TW 104132522 A TW104132522 A TW 104132522A TW I574142 B TWI574142 B TW I574142B
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maximum power
power point
point tracking
tracking unit
unit
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TW201714032A (en
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盧育成
黃俊芬
汪俊峰
謝卓明
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旭隼科技股份有限公司
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雙路最大功率點追蹤離網型太陽能逆變器裝置及其控制方法 Dual maximum power point tracking off-grid solar inverter device and control method thereof

本發明有關於一種離網型太陽能逆變器裝置,且特別是一種具有兩路最大功率點追蹤的離網型太陽能逆變器裝置及其控制方法。 The invention relates to an off-grid solar inverter device, and in particular to an off-grid solar inverter device with two maximum power point tracking and a control method thereof.

太陽能是綠色潔淨能源的一種良好選擇,當太陽能板要將吸收太陽光而產生的光伏能輸出時,為了提升功率轉換效率,往往需要使用最大功率點追蹤技術。通常,一組太陽能板是對應一個最大功率追蹤設備,然而,在實務應用上,個別太陽能板的設置不同以及環境情況的差異,會造成的太陽能產出電功率的不同,各組的太陽能板需要對其各自的最大功率點進行追蹤,使得使用者需要對每一組太陽能板配置一組對應且獨立的最大功率點追蹤(Maximum Power Point Tracking,MPPT)設備。當該組太陽能板所對應的最大功率點追蹤設備損壞時,使用者需要採購新的設備,如此可能造成設備維護的不便,與太陽能集電系統的不穩定性。 Solar energy is a good choice for green clean energy. When solar panels are to absorb solar energy generated by sunlight, in order to improve power conversion efficiency, it is often necessary to use maximum power point tracking technology. Usually, a set of solar panels corresponds to a maximum power tracking device. However, in practical applications, the difference in the setting of individual solar panels and the difference in environmental conditions will result in different solar power output, and the solar panels of each group need to be Their respective maximum power points are tracked, so that the user needs to configure a corresponding and independent Maximum Power Point Tracking (MPPT) device for each group of solar panels. When the maximum power point tracking device corresponding to the solar panel is damaged, the user needs to purchase new equipment, which may cause inconvenience in equipment maintenance and instability of the solar collector system.

本發明實施例提供一種雙路最大功率點追蹤離網型太陽能逆變器裝置及控制其方法,利用兩路最大功率點追蹤實現動態調整功率轉換以及冗餘(redundancy)功能。藉此,離網型太陽能逆變器裝置可以應用於兩組獨立的太陽能板單元。 The embodiment of the invention provides a dual-channel maximum power point tracking off-grid solar inverter device and a method for controlling the same, and uses two maximum power point tracking to realize dynamic adjustment power conversion and redundancy function. Thereby, the off-grid solar inverter device can be applied to two sets of independent solar panel units.

本發明實施例提供一種雙路最大功率點追蹤離網型太陽能逆變器裝置,包括第一最大功率點追蹤單元、第二最大功率追蹤單元以及逆變主控單元。第一最大功率點追蹤單元用以耦接第一太陽能板單元以產生電能。第二最大功率點追蹤單元用以耦接第二太陽能板單元以產生電能,其中第一最大功率點追蹤單元與第二最大功率點追蹤單元分別自第一太陽能板單元以及第二太陽能板單元產生電能後透過軟硬體組合而成的競爭機制,以分別成為第一從機與第二從機。逆變主控單元耦接第一最大功率點追蹤單元與第二最大功率點追蹤單元,將第一最大功率點追蹤單元與第二最大功率點追蹤單元的電能轉換為直流電,且利用此直流電對電池充電,並且將電池的電力或者第一最大功率點追蹤單元與第二最大功率點追蹤單元產生的電能轉換為交流電以提供給負載。其中,逆變主控單元對第一最大功率點追蹤單元與第二最大功率點追蹤單元進行冗餘控制。其中,逆變主控單元根據負載大小以及使用者所設定的充電電流,主導第一最大功率追蹤單元與第二最大功率追蹤單元的輸出功率,以滿足充電及負載的需求。 Embodiments of the present invention provide a dual-channel maximum power point tracking off-grid solar inverter device, including a first maximum power point tracking unit, a second maximum power tracking unit, and an inverter main control unit. The first maximum power point tracking unit is configured to couple the first solar panel unit to generate electrical energy. The second maximum power point tracking unit is configured to couple the second solar panel unit to generate electrical energy, wherein the first maximum power point tracking unit and the second maximum power point tracking unit are respectively generated from the first solar panel unit and the second solar panel unit After the power is passed through a combination of software and hardware, the competition mechanism becomes the first slave and the second slave, respectively. The inverter main control unit is coupled to the first maximum power point tracking unit and the second maximum power point tracking unit, and converts the electrical energy of the first maximum power point tracking unit and the second maximum power point tracking unit into direct current, and uses the direct current pair The battery is charged, and the power of the battery or the electrical energy generated by the first maximum power point tracking unit and the second maximum power point tracking unit is converted into alternating current to be supplied to the load. The inverter main control unit performs redundancy control on the first maximum power point tracking unit and the second maximum power point tracking unit. The inverter main control unit controls the output power of the first maximum power tracking unit and the second maximum power tracking unit according to the load size and the charging current set by the user to meet the charging and load requirements.

本發明實施例提供一種雙路最大功率點追蹤離網型太陽能逆變器的控制方法,包括以下步驟。首先,透過軟硬體組合而成的競爭機制,第一最大功率點追蹤單元與第二最大功率點追蹤單元分別自第一太陽能板單元以及第二太陽能板單元產生電能後,分別成為第一從機與第二從機。然後,第一最大功率點追蹤單元與第二最大功率點追蹤單元分別進行最大功率點追蹤。然後,逆變主控單元根據握手協議,掌握第一從機及第二從機的運作狀況,從而對第一最大功率點追蹤單元與第二最大功率追蹤單元進行冗餘控制。再來,逆變主控單元根據負載大小以及使用者所設定的充電電流,主導第一最大功率點追蹤單元與第二最大功率點追蹤單元的輸出功率,以滿足充電及負載的需求。 Embodiments of the present invention provide a method for controlling a dual-channel maximum power point tracking off-grid solar inverter, including the following steps. First, through the competition mechanism of the combination of the hardware and the hardware, the first maximum power point tracking unit and the second maximum power point tracking unit respectively generate electric energy from the first solar panel unit and the second solar panel unit, respectively, and become the first slaves respectively. Machine and second slave. Then, the first maximum power point tracking unit and the second maximum power point tracking unit respectively perform maximum power point tracking. Then, the inverter main control unit grasps the operating conditions of the first slave and the second slave according to the handshake protocol, thereby performing redundancy control on the first maximum power point tracking unit and the second maximum power tracking unit. Then, the inverter main control unit controls the output power of the first maximum power point tracking unit and the second maximum power point tracking unit according to the load size and the charging current set by the user to meet the charging and load requirements.

綜上所述,本發明實施例提供一種雙路最大功率點追蹤離網 型太陽能逆變器裝置及其控制方法,對於兩個太陽能電力來源做最大功率點追蹤,並且依據所述兩個太陽能電力是否產出而進行冗餘控制,以動態調整功率轉換,藉此提高太陽能板對電池充電或對負載供電的效率。 In summary, the embodiment of the present invention provides a dual-channel maximum power point tracking off-grid. Solar inverter device and control method thereof, perform maximum power point tracking for two solar power sources, and perform redundancy control according to whether the two solar powers are output, to dynamically adjust power conversion, thereby increasing solar energy The efficiency with which the board charges the battery or powers the load.

為使能更進一步瞭解本發明之特徵及技術內容,請參閱以下有關本發明之詳細說明與附圖,但是此等說明與所附圖式僅係用來說明本發明,而非對本發明的權利範圍作任何的限制。 The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

MPPT1、MPPT2、11、12‧‧‧最大功率點追蹤單元 MPPT1, MPPT2, 11, 12‧‧‧ maximum power point tracking unit

10‧‧‧逆變器 10‧‧‧Inverter

1‧‧‧雙路最大功率點追蹤離網型太陽能逆變器裝置 1‧‧‧Two-way maximum power point tracking off-grid solar inverter device

2‧‧‧電池 2‧‧‧Battery

3‧‧‧負載 3‧‧‧load

4‧‧‧電網 4‧‧‧Power grid

SCI‧‧‧串列通訊界面 SCI‧‧‧Serial communication interface

A1‧‧‧第一太陽能板單元 A1‧‧‧First solar panel unit

A2‧‧‧第二太陽能板單元 A2‧‧‧second solar panel unit

111、121‧‧‧微控制器 111, 121‧‧‧Microcontroller

101a、101b‧‧‧太陽能輸入埠 101a, 101b‧‧‧ solar input 埠

102‧‧‧連接埠 102‧‧‧Connector

13‧‧‧逆變主控單元 13‧‧‧Inverter main control unit

14‧‧‧設定單元 14‧‧‧Setting unit

131‧‧‧直流轉換模組 131‧‧‧DC conversion module

132‧‧‧交直流雙向轉換模組 132‧‧‧AC and DC bidirectional conversion module

133‧‧‧中央控制器 133‧‧‧Central controller

134‧‧‧開關 134‧‧‧ switch

103‧‧‧負載連接埠 103‧‧‧Load connection埠

104‧‧‧電網輸入埠 104‧‧‧Grid input埠

105‧‧‧乾接點 105‧‧‧ dry joints

106‧‧‧連接埠 106‧‧‧Connected

107‧‧‧卡插槽 107‧‧‧ card slot

106a‧‧‧介面 106a‧‧ Interface

107a‧‧‧簡單網路管理協議模組 107a‧‧‧Simple Network Management Protocol Module

108‧‧‧顯示模組 108‧‧‧Display module

109‧‧‧功能鍵 109‧‧‧ function keys

PV1、PV2‧‧‧太陽能電力 PV1, PV2‧‧‧ solar power

PW1‧‧‧直流電 PW1‧‧‧DC

PW2、PW3‧‧‧交流電 PW2, PW3‧‧‧ AC

RPP、ON/OFF、PWM‧‧‧控制訊號 RPP, ON/OFF, PWM‧‧‧ control signals

OCP、OVP、NTC‧‧‧工作訊號 OCP, OVP, NTC‧‧‧ work signals

POS+、NEG-、OP-L、OP-N、OP-G、IP-L、IP-N、IP-G‧‧‧端子 POS+, NEG-, OP-L, OP-N, OP-G, IP-L, IP-N, IP-G‧‧‧ terminals

S310、S320、S330、S340‧‧‧步驟流程 S310, S320, S330, S340‧‧‧ step process

圖1是本發明實施例提供的雙路太陽能最大功率點追蹤機制的架構圖。 FIG. 1 is a structural diagram of a two-way solar maximum power point tracking mechanism according to an embodiment of the present invention.

圖2是本發明實施例提供的雙路最大功率點追蹤離網型太陽能逆變器裝置的電路方塊圖。 2 is a circuit block diagram of a dual-channel maximum power point tracking off-grid solar inverter device according to an embodiment of the present invention.

圖3是本發明實施例提供的雙路最大功率點追蹤離網型太陽能逆變器裝置的細部電路方塊圖。 3 is a detailed circuit block diagram of a dual-channel maximum power point tracking off-grid solar inverter device according to an embodiment of the present invention.

圖4是本發明實施例提供的雙路最大功率點追蹤離網型太陽能逆變器裝置的控制方法的流程圖。 4 is a flow chart of a method for controlling a two-way maximum power point tracking off-grid solar inverter device according to an embodiment of the present invention.

〔雙路最大功率點追蹤離網型太陽能逆變器裝置之實施例〕 [Embodiment of Dual Maximum Power Point Tracking Off-grid Solar Inverter Device]

太陽能集電裝置區分為併網型與離網型,併網型可回送電力給電網,而離網型則不需回送電力給電網。本實施例的離網型太陽能逆變器裝置是以雙路太陽能最大功率點追蹤機制實現。請參照圖1,圖1是本發明實施例提供的雙路太陽能最大功率點追蹤機制的架構圖。此架構可以配合太陽能板的組配彈性,使得單一個離網型太陽能逆變器裝置可以對應兩組太陽能板,且運作不受限於任何一組太陽能板的供電與否。在實際應用時,因應氣候環境條件變化,使得每一組太陽能板的供電情況並不相同,也就是功 率轉換大小並不相同。利用本實施例的雙路太陽能最大功率點追蹤機制的架構,本實施例的雙路最大功率點追蹤離網型太陽能逆變器裝置可以實現功率轉換的最大化,並且可以動態調整功率轉換。 The solar collectors are divided into a grid-connected type and an off-grid type. The grid-connected type can return power to the grid, while the off-grid type does not need to return power to the grid. The off-grid solar inverter device of this embodiment is realized by a two-way solar maximum power point tracking mechanism. Please refer to FIG. 1. FIG. 1 is a structural diagram of a two-way solar maximum power point tracking mechanism according to an embodiment of the present invention. This architecture can be combined with the assembly flexibility of the solar panels, so that a single off-grid solar inverter device can correspond to two sets of solar panels, and the operation is not limited to the power supply of any group of solar panels. In practical applications, in response to changes in climatic environmental conditions, the power supply of each group of solar panels is not the same, that is, The rate conversion size is not the same. With the architecture of the two-way solar maximum power point tracking mechanism of the embodiment, the dual maximum power point tracking off-grid solar inverter device of the embodiment can maximize the power conversion and dynamically adjust the power conversion.

兩個最大功率點追蹤單元MPPT1、MPPT2和逆變器(Inverter)10以通訊界面彼此連接,例如是串列通訊界面(SCI)。以串列通訊界面(SCI)為例,最大功率點追蹤單元MPPT1、MPPT2的發送信號端TXD和接收訊號端RXD一併接至逆變器10的發送信號端TXD和接收訊號端RXD,也就是逆變器10和最大功率點追蹤單元MPPT1、MPPT2彼此通過串列通訊介面來交互訊息。逆變器10是作為主機(master)以向最大功率點追蹤單元MPPT1、MPPT2發命令,並即時收取最大功率點追蹤單元MPPT1、MPPT2的回饋訊息。兩個最大功率點追蹤單元MPPT1、MPPT2均為從機(slave),並同時接收逆變器10發出的命令並判斷該命令的對象,作為該命令對象的最大功率點追蹤單元(MPPT1或MPPT2)立即做出回饋,將回饋訊息及發送給逆變器10。 The two maximum power point tracking units MPPT1, MPPT2 and Inverter 10 are connected to each other by a communication interface, such as a serial communication interface (SCI). Taking the serial communication interface (SCI) as an example, the transmission signal terminal TXD of the maximum power point tracking unit MPPT1, MPPT2 and the reception signal terminal RXD are connected to the transmission signal terminal TXD and the reception signal terminal RXD of the inverter 10, that is, The inverter 10 and the maximum power point tracking units MPPT1, MPPT2 exchange messages with each other through the serial communication interface. The inverter 10 acts as a master to issue commands to the maximum power point tracking units MPPT1, MPPT2, and immediately receives feedback messages of the maximum power point tracking units MPPT1, MPPT2. The two maximum power point tracking units MPPT1 and MPPT2 are slaves, and simultaneously receive the command issued by the inverter 10 and determine the object of the command as the maximum power point tracking unit (MPPT1 or MPPT2) of the command object. The feedback is immediately made, and the feedback message is sent to the inverter 10.

此外,最大功率點追蹤單元MPPT1、MPPT2透過軟硬體組合而成的競爭機制,產生自身的實體位址,即自動分配為第一從機(first slave)與第二從機(second slave),進行訊息交換。所謂的軟硬體競爭機制,主要是在各個從機上預設一個的公共參考點。從機產生電源後,透過軟體的方式觀測公共參考點的狀態;定義最早接觸公共參考點的從機為第一從機,第二接觸公共參考點的從機為第二從機。 In addition, the maximum power point tracking units MPPT1 and MPPT2 generate their own physical addresses through a competition mechanism composed of software and hardware, that is, they are automatically assigned as a first slave and a second slave. Exchange information. The so-called software and hardware competition mechanism is mainly to pre-set a common reference point on each slave. After the slave generates power, the state of the common reference point is observed through the software; the slave that first contacts the common reference point is defined as the first slave, and the slave that contacts the common reference point is the second slave.

請參照圖2,圖是本發明實施例提供的雙路最大功率點追蹤離網型太陽能逆變器裝置的電路方塊圖。雙路最大功率點追蹤離網型太陽能逆變器裝置1包括第一最大功率點追蹤單元11、第二最大功率追蹤單元12、逆變主控單元13以及設定單元14。逆變主控單元13耦接第一最大功率點追蹤單元11、第二最大功率追蹤單 元12以及設定單元14。依照圖1的架構,最大功率點追蹤單元11、最大功率點追蹤單元12分別對應圖1的最大功率點追蹤單元MPPT1與最大功率點追蹤單元MPPT2。逆變主控單元13對應於逆變器10。 Please refer to FIG. 2 , which is a circuit block diagram of a dual-channel maximum power point tracking off-grid solar inverter device according to an embodiment of the present invention. The dual maximum power point tracking off-grid solar inverter device 1 includes a first maximum power point tracking unit 11, a second maximum power tracking unit 12, an inverter main control unit 13, and a setting unit 14. The inverter main control unit 13 is coupled to the first maximum power point tracking unit 11 and the second maximum power tracking unit. Element 12 and setting unit 14. According to the architecture of FIG. 1, the maximum power point tracking unit 11 and the maximum power point tracking unit 12 respectively correspond to the maximum power point tracking unit MPPT1 and the maximum power point tracking unit MPPT2 of FIG. The inverter main control unit 13 corresponds to the inverter 10.

第一最大功率點追蹤單元11用以耦接第一太陽能板單元A1以產生電能PV1。第二最大功率點追蹤單元11用以耦接第二太陽能板單元A2以產生電能PV2。第一太陽能板單元A1以及第二太陽能板單元A2是彼此獨立的太陽能發電單元。其中,如前所述,第一最大功率點追蹤單元11與第二最大功率點追蹤單元12分別自第一太陽能板單元A1以及第二太陽能板單元A2產生電能後透過軟硬體組合而成的競爭機制,以分別成為第一從機與第二從機。逆變主控單元13將第一最大功率點追蹤單元11與第二最大功率點追蹤單元12的電能轉換為直流電PW1,且利用此直流電PW1對電池2充電,並且將電池2的電力或者第一最大功率點追蹤單元11與第二最大功率點追蹤單元12產生的電能轉換為交流電PW2以提供給負載3。其中,逆變主控單元13對第一最大功率點追蹤單元與第二最大功率點追蹤單元進行冗餘控制。逆變主控單元13也根據負載大小以及使用者透過設定單元14所設定的充電電流,主導第一最大功率追蹤單元11與第二最大功率追蹤單元12的輸出功率,以滿足充電及負載的需求。 The first maximum power point tracking unit 11 is configured to couple the first solar panel unit A1 to generate electrical energy PV1. The second maximum power point tracking unit 11 is configured to couple the second solar panel unit A2 to generate the electrical energy PV2. The first solar panel unit A1 and the second solar panel unit A2 are solar power generation units independent of each other. As described above, the first maximum power point tracking unit 11 and the second maximum power point tracking unit 12 respectively generate electrical energy from the first solar panel unit A1 and the second solar panel unit A2, and then combine the soft and hard bodies. The competition mechanism is to become the first slave and the second slave respectively. The inverter main control unit 13 converts the electric energy of the first maximum power point tracking unit 11 and the second maximum power point tracking unit 12 into the direct current PW1, and charges the battery 2 with the direct current PW1, and the electric power of the battery 2 or the first The electric energy generated by the maximum power point tracking unit 11 and the second maximum power point tracking unit 12 is converted into an alternating current PW2 to be supplied to the load 3. The inverter main control unit 13 performs redundancy control on the first maximum power point tracking unit and the second maximum power point tracking unit. The inverter main control unit 13 also dominates the output power of the first maximum power tracking unit 11 and the second maximum power tracking unit 12 according to the load size and the charging current set by the user through the setting unit 14 to meet the charging and load requirements. .

接著,請參照圖3,圖3是本發明實施例提供的離網型太陽能逆變器裝置的細部電路方塊圖。雙路最大功率點追蹤離網型太陽能逆變器裝置1包括最大功率點追蹤單元11、最大功率點追蹤單元12、逆變主控單元13、顯示模組108、功能鍵109,以及外部設定輸入埠(105、106、107)及其控制電路(106a、107a)。顯示模組108、功能鍵109,以及外部設定輸入埠(105、106、107)是屬於圖2的設定單元14的各種實現方式。例如,顯示模組108(如液晶顯示模組)與功能鍵109,可將其設計為控制面板,使用者也可以直 接在控制面板操作此雙路最大功率點追蹤離網型太陽能逆變器裝置1的各種功能與參數控制。而關於外部設定輸入埠(105、106、107)及其控制電路(106a、107a),將於後續另外說明。 Next, please refer to FIG. 3. FIG. 3 is a detailed circuit block diagram of an off-grid solar inverter device according to an embodiment of the present invention. The two-way maximum power point tracking off-grid solar inverter device 1 includes a maximum power point tracking unit 11, a maximum power point tracking unit 12, an inverter main control unit 13, a display module 108, function keys 109, and an external setting input.埠 (105, 106, 107) and its control circuits (106a, 107a). Display module 108, function keys 109, and external setting inputs 105 (105, 106, 107) are various implementations of setting unit 14 of FIG. For example, the display module 108 (such as a liquid crystal display module) and the function key 109 can be designed as a control panel, and the user can also be straight. Connected to the control panel to operate the two-way maximum power point to track various functions and parameter controls of the off-grid solar inverter device 1. The external setting input 埠 (105, 106, 107) and its control circuit (106a, 107a) will be described later.

此雙路最大功率點追蹤離網型太陽能逆變器裝置1具有多個連接埠,包括太陽能輸入埠101a、101b、連接電池2的連接埠102,連接負載3的負載連接埠103與連接電網4的電網輸入埠104。太陽能輸入埠101a、101b與連接電池2的電池連接埠102都具有兩個端子POS+、NEG-,以導通直流電。負載連接埠103與電網輸入埠104則可各自具有三個端子,以導通交流電。負載連接埠103的三個端子為OP-L、OP-N、OP-G。電網輸入埠104的三個端子為IP-L、IP-N、IP-G,用於接收電網的交流電PW3,電網輸入埠104透過開關134耦接交直流雙向轉換模組132。外部設定輸入埠(105、106、107)耦接中央控制器133,提供外部設定訊號,以控制雙路最大功率點追蹤離網型太陽能逆變器裝置1,關於外部設定輸入埠(105、106、107)將於後續說明。 The dual-channel maximum power point tracking off-grid solar inverter device 1 has a plurality of ports, including solar input ports 101a, 101b, a port 102 connecting the batteries 2, a load port 103 connecting the load 3, and a connection grid 4 The grid input 埠 104. The solar input ports 101a, 101b and the battery port 102 connecting the batteries 2 have two terminals POS+, NEG- to conduct direct current. The load port 103 and the grid input port 104 can each have three terminals to conduct AC power. The three terminals of the load port 103 are OP-L, OP-N, and OP-G. The three terminals of the power grid input port 104 are IP-L, IP-N, and IP-G, and are used to receive the AC power PW3 of the power grid. The power grid input port 104 is coupled to the AC/DC bidirectional conversion module 132 through the switch 134. The external setting input 埠 (105, 106, 107) is coupled to the central controller 133 to provide an external setting signal to control the dual maximum power point tracking off-grid solar inverter device 1 with respect to the external setting input 埠 (105, 106) , 107) will be explained later.

最大功率點追蹤單元11、12各自具有微控制器(MCU)111、121。並且,最大功率點追蹤單元11具有太陽能輸入埠101a,對來自太陽能輸入埠101a的電力進行最大功率點追蹤以產生電能PV1。最大功率點追蹤單元12具有太陽能輸入埠101b,對來自太陽能輸入埠101b的電力進行最大功率點追蹤以產生電能PV2。 The maximum power point tracking units 11, 12 each have a microcontroller (MCU) 111, 121. And, the maximum power point tracking unit 11 has a solar energy input port 101a for performing maximum power point tracking on the power from the solar energy input port 101a to generate electric energy PV1. The maximum power point tracking unit 12 has a solar input port 101b that performs maximum power point tracking on the power from the solar input port 101b to generate electrical energy PV2.

接著,說明最大功率點追蹤單元11、12的異常處理與工作。當最大功率點追蹤單元11、12其中任一個出現異常,另一個最大功率點追蹤單元則仍能正常與逆變器10通訊,並執行正常的工作。當最大功率點追蹤單元11、12同時出現失效(loss)或失去電力(power off),則逆變主控單元13通過判斷與最大功率點追蹤單元11、12的通訊狀態,將狀況判斷為太陽能電力失去(PV loss)。 Next, the abnormal processing and operation of the maximum power point tracking units 11, 12 will be described. When an abnormality occurs in any of the maximum power point tracking units 11, 12, the other maximum power point tracking unit can still normally communicate with the inverter 10 and perform normal operation. When the maximum power point tracking unit 11, 12 simultaneously experiences loss or power off, the inverter main control unit 13 determines the status as solar energy by judging the communication state with the maximum power point tracking unit 11, 12. Power loss (PV loss).

最大功率點追蹤單元11、12可依據下數的兩種特定條件進行工作。條件(一),僅最大功率追蹤單元11、12其中之一有電(供電): 自身配置為第一從機,且與逆變主控單元13建立通訊。由逆變主控單元13發送相關訊息給最大功率追蹤單元開啟正常充電模式(對電池2充電)。並且,逆變主控單元可以間隔時間(如兩秒)反覆檢查最大功率點追蹤單元的狀態。條件(二),最大功率點追蹤單元11、12兩者皆供電:透過競爭機制,產生第一從機與第二從機,先啟動(產生電能)的最大功率點追蹤單元是第一從機,後啟動者則成為第二從機,逆變主控單元13通過串列通訊界面(SCI)分時與最大功率點追蹤單元11、12建立通訊,逆變主控單元13發送相關訊息給最大功率點追蹤單元11對電池2充電,逆變主控單元13發送相關訊息給最大功率點追蹤單元12對電池2充電。 The maximum power point tracking units 11, 12 can operate according to two specific conditions of the next number. Condition (1), only one of the maximum power tracking units 11, 12 has electricity (power supply): It is configured as a first slave and establishes communication with the inverter master unit 13. The relevant information is sent by the inverter main control unit 13 to the maximum power tracking unit to turn on the normal charging mode (charging the battery 2). Moreover, the inverter master unit can repeatedly check the state of the maximum power point tracking unit at intervals (eg, two seconds). Condition (2), the maximum power point tracking unit 11 and 12 are both powered: through the competition mechanism, the first slave and the second slave are generated, and the maximum power point tracking unit that starts (generates electric energy) is the first slave. The post-starter becomes the second slave, and the inverter main control unit 13 establishes communication with the maximum power point tracking unit 11, 12 through the serial communication interface (SCI), and the inverter main control unit 13 sends the relevant message to the maximum. The power point tracking unit 11 charges the battery 2, and the inverter main control unit 13 transmits a related message to the maximum power point tracking unit 12 to charge the battery 2.

換句話說,最大功率點追蹤單元11或12在有接入太陽能量之後,可以對太陽能進行最大功率點追蹤,並且最大功率點追蹤單元11、12是冗餘的設計,當其中一個最大功率點追蹤單元損壞或失效,不會影響另一個最大功率點追蹤單元的正常通訊與工作。並且,逆變主控單元13會隨時根據第一從機與第二從機的供電能力,搭配充電電流的設定(使用者所設定),適時調整充電及負載功率。 In other words, the maximum power point tracking unit 11 or 12 can perform maximum power point tracking on the solar energy after having access to the solar energy amount, and the maximum power point tracking unit 11, 12 is a redundant design, when one of the maximum power points Damage or failure of the tracking unit will not affect the normal communication and operation of another maximum power point tracking unit. Moreover, the inverter main control unit 13 adjusts the charging and load power in time according to the power supply capability of the first slave and the second slave, and the setting of the charging current (set by the user).

接著,進一步說明逆變主控單元13。逆變主控單元包括直流轉換模組(DC/DC module)131、交直流向轉換模組(AC/DC or DC/AC bi-directional module)132、中央控制器133與開關134。直流轉換模組131耦接最大功率點追蹤單元11、最大功率點追蹤單元12與電池13。交直流雙向轉換模組132耦接於直流轉換模組131與負載3之間。中央控制器133耦接直流轉換模組131、交直流雙向轉換模組132,且利用串列通訊界面(SCI)耦接最大功率點追蹤單元11、12,以控制直流轉換模組131、交直流雙向轉換模組132與最大功率點追蹤單元11、12。 Next, the inverter main control unit 13 will be further described. The inverter main control unit includes a DC/DC module 131, an AC/DC or DC/AC bi-directional module 132, a central controller 133 and a switch 134. The DC conversion module 131 is coupled to the maximum power point tracking unit 11, the maximum power point tracking unit 12, and the battery 13. The AC/DC bidirectional conversion module 132 is coupled between the DC conversion module 131 and the load 3. The central controller 133 is coupled to the DC conversion module 131, the AC/DC bidirectional conversion module 132, and coupled to the maximum power point tracking unit 11 and 12 by a serial communication interface (SCI) to control the DC conversion module 131, AC and DC. The bidirectional conversion module 132 and the maximum power point tracking unit 11, 12.

對於直流轉換模組131而言,其接收最大功率點追蹤單元11、12輸出的電能或者是電池2的電力,並將其轉送至交直流雙向轉 換模組132。或者,直流轉換模組131將來自交直流雙向轉換模組132的電力(電網的交流電PW3轉換成直流電後的電力)傳送至電池2。詳細的說,中央控制器133產生控制訊號RPP、ON/OFF以控制直流轉換模組131,直流轉換模組131則回饋工作訊號OVP、NTC給中央控制器133。中央控制器133可以是微控制器(MCU)或中央處理器(CPU)。直流轉換模組131可以是常見的升壓轉換器、降壓轉換器或升降壓轉換器,並且一般而言前述的控制訊號與回饋的工作訊號屬於所屬技術領域的習知技術,不再贅述。 For the DC conversion module 131, it receives the power output by the maximum power point tracking unit 11, 12 or the power of the battery 2, and transfers it to the AC and DC bidirectional rotation. Change module 132. Alternatively, the DC conversion module 131 transmits the power from the AC/DC bidirectional conversion module 132 (the power of the AC PW3 of the power grid to the DC power) to the battery 2. In detail, the central controller 133 generates control signals RPP, ON/OFF to control the DC conversion module 131, and the DC conversion module 131 returns the working signals OVP, NTC to the central controller 133. The central controller 133 can be a microcontroller (MCU) or a central processing unit (CPU). The DC conversion module 131 can be a common boost converter, a buck converter, or a buck-boost converter. Generally, the foregoing control signals and feedback operation signals are well-known in the art, and are not described herein.

對於交直流雙向轉換模組132而言,其將來自太陽能的電力(PV1、PV2)或者電池2的電力轉送至負載3。或者,交直流雙向轉換模組132將來自電網4的交流電PW3轉換成直流電力後提供給直流轉換模組131,用於對電池2充電。詳細的說,中央控制器133產生控制訊號PWM、ON/OFF以控制交直流雙向轉換模組132,交直流雙向轉換模組132則回饋工作訊號OCP、OVP、NTC給中央處理器。交直流雙向轉換模組132及其控制訊號與回饋的工作訊號是屬於所屬技術領域的習知技術,不再贅述。 For the AC/DC bidirectional conversion module 132, it transfers power from solar energy (PV1, PV2) or battery 2 to the load 3. Alternatively, the AC/DC bidirectional conversion module 132 converts the AC power PW3 from the power grid 4 into DC power and supplies it to the DC conversion module 131 for charging the battery 2. In detail, the central controller 133 generates control signals PWM, ON/OFF to control the AC/DC bidirectional conversion module 132, and the AC/DC bidirectional conversion module 132 feeds the working signals OCP, OVP, and NTC to the central processing unit. The AC/DC bidirectional conversion module 132 and its control signals and feedback operation signals are well-known technologies in the art, and are not described again.

開關134受控於中央控制器133以將太陽能(PV1、PV2)或者電池2的電力傳送給負載3,或者將電網4的電力轉送給負載(若沒有太陽能電力或者電池2沒電時)。 The switch 134 is controlled by the central controller 133 to transfer the power of the solar energy (PV1, PV2) or the battery 2 to the load 3, or to transfer the power of the grid 4 to the load (if there is no solar power or when the battery 2 is depleted).

接著,說明可讓使用者控制雙路最大功率點追蹤離網型太陽能逆變器裝置1各項參數的外部設定輸入埠。外部設定輸入埠例如是圖3中的乾接點105、連接埠106與卡插槽107。連接埠106如通用串行總線(USB)或RS232連接埠,以讓介面106a(USB/COM)可轉送外部控制訊號給中央控制器133。另外,做為外部設定輸入埠的卡插槽107藉由簡單網路管理協議(SNMP,Simple Network Management Protocol)模組107a耦接中央控制器133,可設定、監控及管理此離網型太陽能逆變器裝置1的硬體,當SNMP/WEB硬體管理卡插入卡插槽107後,再將連線及網路設定完成,使用者 即可遠端用WEB介面操控此雙路最大功率點追蹤離網型太陽能逆變器裝置1,功能包含狀態監控及設定,異常狀態通知等。 Next, an external setting input port that allows the user to control the two-way maximum power point tracking off-grid solar inverter device 1 parameters will be described. The external setting input 埠 is, for example, the dry contact 105, the connection port 106, and the card slot 107 in FIG. A port 106 such as a universal serial bus (USB) or RS232 port is provided to allow the interface 106a (USB/COM) to forward external control signals to the central controller 133. In addition, the card slot 107 as an external setting input port is coupled to the central controller 133 by a Simple Network Management Protocol (SNMP) module 107a, which can set, monitor, and manage the off-grid solar counter. The hardware of the transformer device 1, when the SNMP/WEB hardware management card is inserted into the card slot 107, the connection and network settings are completed, and the user The remote terminal can control the dual-channel maximum power point tracking off-grid solar inverter device 1 with functions including state monitoring and setting, abnormal state notification, and the like.

〔離網型太陽能逆變器裝置的控制方法之實施例〕 [Embodiment of Control Method of Off-Grid Solar Inverter Device]

請同時參照圖3與圖4,圖4是本發明實施例提供的雙路最大功率點追蹤離網型太陽能逆變器裝置的控制方法的流程圖。首先,在步驟S310中,透過軟硬體組合而成的競爭機制,第一最大功率點追蹤單元(11)與第二最大功率點追蹤單元(12)自太陽能板產生電能(PV1、PV2)後,分別成為第一從機與第二從機。然後,在步驟S320中,第一最大功率點追蹤單元(11)與第二最大功率追蹤單元(12)分別進行最大功率點追蹤。接著,在步驟S330中,逆變主控單元(13)根據握手協議,掌握第一從機及第二從機的運作狀況,從而對第一最大功率點追蹤單元(11)與第二最大功率點追蹤單元(12)進行冗餘控制。上述握手協議可透過串列通訊界面(SCI)進行。然後,在步驟S340中,逆變主控單元(13)根據負載大小以及使用者所設定的充電電流,主導第一最大功率點追蹤單元與第二最大功率點追蹤單元的輸出功率,以滿足充電及負載的需求。其中,當第一太陽能電力(PV1)與第二太陽能電力(PV2)未產生時,逆變主控單元(13)則將電池(2)的電力轉換為交流電(PW2)以對負載(3)供電,詳細的電力轉換過程已於前面實施例提及,不再贅述。 Please refer to FIG. 3 and FIG. 4 simultaneously. FIG. 4 is a flowchart of a method for controlling a dual-channel maximum power point tracking off-grid solar inverter device according to an embodiment of the present invention. First, in step S310, after the first maximum power point tracking unit (11) and the second maximum power point tracking unit (12) generate electrical energy (PV1, PV2) from the solar panel through a competition mechanism composed of soft and hard bodies. , respectively become the first slave and the second slave. Then, in step S320, the first maximum power point tracking unit (11) and the second maximum power tracking unit (12) respectively perform maximum power point tracking. Next, in step S330, the inverter main control unit (13) grasps the operating conditions of the first slave and the second slave according to the handshake protocol, thereby tracking the first maximum power point tracking unit (11) and the second maximum power. The point tracking unit (12) performs redundancy control. The above handshake protocol can be performed through a serial communication interface (SCI). Then, in step S340, the inverter main control unit (13) leads the output power of the first maximum power point tracking unit and the second maximum power point tracking unit according to the load size and the charging current set by the user to satisfy the charging. And the demand for the load. Wherein, when the first solar power (PV1) and the second solar power (PV2) are not generated, the inverter main control unit (13) converts the power of the battery (2) into alternating current (PW2) to the load (3). Power supply, detailed power conversion process has been mentioned in the previous embodiment, and will not be described again.

另外,除了上述步驟,在雙路最大功率點追蹤離網型太陽能逆變器裝置(1)有接電網(4)的情況下,此方法更包括,逆變主控單元(13)將電網(4)的交流電(PW3)轉送至負載(3)(成為交流電(PW2)),以對負載(3)供電。 In addition, in addition to the above steps, in the case where the two-way maximum power point tracking off-grid solar inverter device (1) has a power grid (4), the method further includes that the inverter main control unit (13) will connect the power grid ( 4) The alternating current (PW3) is transferred to the load (3) (becomes alternating current (PW2)) to supply power to the load (3).

另外,在雙路最大功率點追蹤離網型太陽能逆變器裝置(1)有接電網(4)的情況下,此方法更可包括,當第一太陽能電力(PV1)與第二太陽能電力(PV2)未產生時,逆變主控單元(13)將電網(4)的交流電(PW3)轉換為直流電(PW1)以對電池(2)充電。 In addition, in the case where the two-way maximum power point tracking off-grid solar inverter device (1) has a power grid (4), the method may further include, when the first solar power (PV1) and the second solar power ( When PV2) is not generated, the inverter main control unit (13) converts the alternating current (PW3) of the grid (4) into direct current (PW1) to charge the battery (2).

除了上述步驟,此方法更包括以下步驟,使用者透過外部設定訊號控制直流電的功率。外部設定訊號的輸入方式與來源已於前面實施例提及,不再贅述。 In addition to the above steps, the method further includes the following steps: the user controls the power of the direct current through an external setting signal. The input mode and source of the external setting signal have been mentioned in the previous embodiments, and will not be described again.

〔實施例的可能功效〕 [Possible effects of the examples]

綜上所述,本發明實施例所提供的雙路最大功率點追蹤離網型太陽能逆變器裝置及其控制方法,對於兩個太陽能電力來源做最大功率點追蹤,並且依據所述兩個太陽能電力是否產出而進行冗餘控制,以動態調整功率轉換,藉此提高太陽能板對電池充電或對負載供電的效率。另外,依據所使用的兩個最大功率點追蹤單元的供電情況,可以提供負載分享(或平衡)的功能,藉此控制對於電池或負載的直流電供電功率。 In summary, the dual-channel maximum power point tracking off-grid solar inverter device and the control method thereof are provided by the embodiments of the present invention, and the maximum power point tracking is performed for two solar power sources, and according to the two solar energy The power is output and redundantly controlled to dynamically adjust the power conversion, thereby increasing the efficiency with which the solar panel charges the battery or powers the load. In addition, depending on the power supply conditions of the two maximum power point tracking units used, a load sharing (or balancing) function can be provided, thereby controlling the DC power supply to the battery or load.

以上所述僅為本發明之實施例,其並非用以侷限本發明之專利範圍。 The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

1‧‧‧雙路最大功率點追蹤離網型太陽能逆變器裝置 1‧‧‧Two-way maximum power point tracking off-grid solar inverter device

2‧‧‧電池 2‧‧‧Battery

3‧‧‧負載 3‧‧‧load

11、12‧‧‧最大功率點追蹤單元 11, 12‧‧‧ Maximum power point tracking unit

13‧‧‧逆變主控單元 13‧‧‧Inverter main control unit

A1‧‧‧第一太陽能板單元 A1‧‧‧First solar panel unit

A2‧‧‧第二太陽能板單元 A2‧‧‧second solar panel unit

14‧‧‧設定單元 14‧‧‧Setting unit

PV1、PV2‧‧‧電能 PV1, PV2‧‧‧ electric energy

PW1‧‧‧直流電 PW1‧‧‧DC

PW2‧‧‧交流電 PW2‧‧‧AC

Claims (9)

一種雙路最大功率點追蹤離網型太陽能逆變器裝置,包括:一第一最大功率點追蹤單元,用以耦接一第一太陽能板單元以產生電能;一第二最大功率點追蹤單元,用以耦接一第二太陽能板單元以產生電能,其中該第一最大功率點追蹤單元與該第二最大功率點追蹤單元分別自該第一太陽能板單元以及該第二太陽能板單元產生電能後透過軟硬體組合而成的競爭機制,以分別成為一第一從機與一第二從機;以及一逆變主控單元,耦接該第一最大功率點追蹤單元與該第二最大功率點追蹤單元,該逆變主控單元將該第一最大功率點追蹤單元與該第二最大功率點追蹤單元產生的電能轉換為一直流電,且利用該直流電對一電池充電,並且將該電池的電力或者該第一最大功率點追蹤單元與該第二最大功率點追蹤單元產生的電能轉換為一交流電以提供給一負載;其中,該逆變主控單元對該第一最大功率點追蹤單元與該第二最大功率點追蹤單元進行冗餘控制;其中,該逆變主控單元根據該負載大小以及使用者所設定的一充電電流,主導第一最大功率追蹤單元與第二最大功率追蹤單元的輸出功率;該逆變主控單元中包括有一中央控制器,該中央控制器經由一串列通訊界面(SCI)耦接該第一最大功率點追蹤單元與該第二最大功率點追蹤單元,以分時控制該第一最大功率點追蹤單元與該第二最大功率點追蹤單元。 A dual-channel maximum power point tracking off-grid solar inverter device includes: a first maximum power point tracking unit for coupling a first solar panel unit to generate electrical energy; and a second maximum power point tracking unit, The second solar panel unit is coupled to the second solar panel unit to generate electrical energy, wherein the first maximum power point tracking unit and the second maximum power point tracking unit respectively generate electrical energy from the first solar panel unit and the second solar panel unit. a competition mechanism composed of a combination of hardware and software to respectively become a first slave and a second slave; and an inverter master unit coupled to the first maximum power point tracking unit and the second maximum power a point tracking unit, the inverter main control unit converts the electric energy generated by the first maximum power point tracking unit and the second maximum power point tracking unit into a continuous current, and uses the direct current to charge a battery, and the battery is charged The power generated by the power or the first maximum power point tracking unit and the second maximum power point tracking unit is converted into an alternating current to be supplied to a load; The inverter main control unit performs redundancy control on the first maximum power point tracking unit and the second maximum power point tracking unit; wherein the inverter main control unit is based on the load size and a charging current set by the user And controlling the output power of the first maximum power tracking unit and the second maximum power tracking unit; the inverter main control unit includes a central controller, and the central controller is coupled to the first via a serial communication interface (SCI) The maximum power point tracking unit and the second maximum power point tracking unit control the first maximum power point tracking unit and the second maximum power point tracking unit in a time division manner. 根據請求項第1項之雙路最大功率點追蹤離網型太陽能逆變器裝置,其中該逆變主控單元包括:一直流轉換模組,耦接該第一最大功率點追蹤單元、該第二最大功率追蹤單元與該電池;及一交直流雙向轉換模組,耦接於該直流轉換模組與該負載之間; 其中該中央控制器,耦接該直流轉換模組與該交直流雙向轉換模組,控制該直流轉換模組與該交直流雙向轉換模組。 The off-grid solar inverter device is tracked according to the two-way maximum power point of the first item of the claim, wherein the inverter main control unit comprises: a DC conversion module coupled to the first maximum power point tracking unit, the first a maximum power tracking unit and the battery; and an AC/DC bidirectional conversion module coupled between the DC conversion module and the load; The central controller is coupled to the DC conversion module and the AC/DC bidirectional conversion module to control the DC conversion module and the AC/DC bidirectional conversion module. 根據請求項第2項之雙路最大功率點追蹤離網型太陽能逆變器裝置,更包括:一電網輸入埠,接收一電網的交流電,該電網輸入埠耦接該交直流雙向轉換模組;其中,該交直流雙向轉換模組與該直流轉換模組將該電網輸入埠所接收到的交流電轉換成該直流電,以對該電池充電。 The off-grid solar inverter device according to the two-way maximum power point of claim 2 further includes: a grid input port, receiving an AC power of a power grid, and the grid input port is coupled to the AC/DC bidirectional conversion module; The AC/DC bidirectional conversion module and the DC conversion module convert the AC power received by the grid input port into the DC power to charge the battery. 根據請求項第3項之雙路最大功率點追蹤離網型太陽能逆變器裝置,其中該直流轉換模組與該交直流雙向轉換模組將該電池的電力轉換為該交流電,以對該負載供電。 Tracking the off-grid solar inverter device according to the dual maximum power point of the third item of claim 3, wherein the DC conversion module and the AC/DC bidirectional conversion module convert the power of the battery into the alternating current to the load powered by. 根據請求項第2項之雙路最大功率點追蹤離網型太陽能逆變器裝置,更包括:一外部設定輸入埠,耦接該中央控制器,提供一外部設定訊號,以控制該雙路最大功率點追蹤離網型太陽能逆變器裝置。 According to the two-way maximum power point tracking off-grid solar inverter device of claim 2, the method further includes: an external setting input port coupled to the central controller to provide an external setting signal to control the two-way maximum Power point tracking off-grid solar inverter device. 一種雙路最大功率點追蹤離網型太陽能逆變器的控制方法,包括:透過軟硬體組合而成的競爭機制,一第一最大功率點追蹤單元與一第二最大功率點追蹤單元分別自一第一太陽能板單元以及一第二太陽能板單元產生電能後,分別成為一第一從機與一第二從機;該第一最大功率點追蹤單元與該第二最大功率點追蹤單元分別進行最大功率點追蹤;該逆變主控單元根據握手協議,掌握該第一從機及該第二從機的運作狀況,從而判斷該第一最大功率點追蹤單元與該第二最大功率點追蹤單元是否輸出電能,以對該第一最大功率點追蹤單元與該第二最大功率點追蹤單元進行冗餘控制;以及 該逆變主控單元根據一負載大小以及使用者所設定的一充電電流,主導該第一最大功率點追蹤單元與該第二最大功率點追蹤單元的輸出功率;其中該逆變主控單元中有一中央控制器,該中央控制器經由一串列通訊界面(SCI)耦接該第一最大功率點追蹤單元與該第二最大功率點追蹤單元,以分時控制該第一最大功率點追蹤單元與該第二最大功率點追蹤單元。 A dual-channel maximum power point tracking off-grid solar inverter control method includes: a competition mechanism composed of a combination of hardware and software, a first maximum power point tracking unit and a second maximum power point tracking unit respectively After the first solar panel unit and the second solar panel unit generate electrical energy, respectively, a first slave and a second slave; the first maximum power point tracking unit and the second maximum power point tracking unit respectively perform The maximum power point tracking; the inverter main control unit grasps the operation status of the first slave and the second slave according to the handshake protocol, thereby determining the first maximum power point tracking unit and the second maximum power point tracking unit Whether to output electrical energy to perform redundancy control on the first maximum power point tracking unit and the second maximum power point tracking unit; The inverter main control unit leads the output power of the first maximum power point tracking unit and the second maximum power point tracking unit according to a load size and a charging current set by the user; wherein the inverter main control unit a central controller, the central controller coupling the first maximum power point tracking unit and the second maximum power point tracking unit via a serial communication interface (SCI) to control the first maximum power point tracking unit in a time-sharing manner And the second maximum power point tracking unit. 根據請求項第6項之雙路最大功率點追蹤離網型太陽能逆變器的控制方法,更包括:當該第一太陽能電力與該第二太陽能電力未產生時,該逆變主控單元將一電網的交流電轉換為該直流電,以對一電池充電。 The method for controlling the off-grid solar inverter according to the two-way maximum power point of claim 6 further includes: when the first solar power and the second solar power are not generated, the inverter main control unit The alternating current of a power grid is converted to the direct current to charge a battery. 根據請求項第6項之雙路最大功率點追蹤離網型太陽能逆變器的控制方法,更包括:該逆變主控單元將一電網的交流電轉送至該負載,以對該負載供電。 The method for controlling the off-grid solar inverter according to the two-way maximum power point of claim 6 further includes: the inverter main control unit transfers the alternating current of a power grid to the load to supply the load. 根據請求項第6項之雙路最大功率點追蹤離網型太陽能逆變器的控制方法,更包括:使用者透過一外部設定訊號設定該直流電的功率。 The method for controlling the off-grid solar inverter according to the two-way maximum power point of claim 6 further includes: setting the power of the direct current through an external setting signal.
TW104132522A 2015-10-02 2015-10-02 Two path maximum power point tracking off-grid solar inverter apparatus and control method thereof TWI574142B (en)

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