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1、外文資料翻譯譯文:光伏并網(wǎng)逆變器最近,人們越來越關(guān)注的替代能源,因為化石燃料和核電廠的環(huán)境影響及其穩(wěn)定性長尾和原田,1997年; Myrzlk,2001年。在各種替代能源中,太陽能發(fā)電尤為重視,除了因為它是一種清潔的,無限的能源,此外相當(dāng)多的研究已經(jīng)在這一領(lǐng)域取得了突出的成績。太陽能發(fā)電系統(tǒng)由太陽電池組件,充電電池,和一個逆變器?,F(xiàn)在只有逆變電流模式進(jìn)入主流,原因是光伏逆變是正弦電流進(jìn)入電網(wǎng)。具體表達(dá)在單相并網(wǎng)光伏逆變器中,它具有普遍的拓?fù)浣Y(jié)構(gòu),這是標(biāo)準(zhǔn)的全橋電壓源逆變器電平逆變器,它可以創(chuàng)立一個正弦電網(wǎng)電流Kjaer et al., 2005;
2、0;Kojabadi et al., 2006。這種拓?fù)浣Y(jié)構(gòu)有兩個普遍的問題如下。 1 電池是太陽能發(fā)電廠必不可少的儲存電能設(shè)備。但電池充電是一個短期和有污染的過程,并且有負(fù)面經(jīng)濟(jì)的效率。然而,逆變器可以不使用電池可以解決這些問題。在這個過程中,接口電路為逆變環(huán)節(jié)的直流電 DC 輸出的太陽能電池陣列的交流電源系統(tǒng)。如果輸出電壓的電流源逆變低于電力系統(tǒng)電壓和在發(fā)生短路負(fù)荷或逆變器故障,它沒有電流短路Myrzlk,2001年 。 2 在一般的微處理器作為控制器,以
3、實現(xiàn)良好的特點時,太陽能發(fā)電系統(tǒng)與電流源逆變器的設(shè)計。是在控制器以較少的價值,有高質(zhì)量電感和電波的輸出電流的高開關(guān)頻率變頻器所需要的,但是,受限制的是開關(guān)損耗和處理器的采樣頻率。 圖.1顯示的結(jié)構(gòu)電流源逆變器用作接口電路連接太陽能電池的實用線Mohan et al,1995年 。它由五個開關(guān),一個電感器, LC濾波器,輸出端口。逆變器工作在這兩個開關(guān)模式。質(zhì)量保證開關(guān)只執(zhí)行斬波行動,而第一季度,第四季度交換機(jī)確定方向的輸出電壓根據(jù)極性的電力系統(tǒng)。因此,與一般全橋PWM逆變器執(zhí)行完整的一塊,該系統(tǒng)減少了開關(guān)損耗。圖.2顯示波形的傳統(tǒng)電流源逆變器。
4、它代表了波形的輸出電壓和電流,該電流通過電感,輸入信號,每個開關(guān)。圖.3顯示了脈沖轉(zhuǎn)變電流源逆變器電路,用于降低開關(guān)頻率和提高效率。當(dāng)太陽能電池模塊輸出電壓的是高于或低于輸出電壓的轉(zhuǎn)換器,那么合成的電流源轉(zhuǎn)換,這需要Buck - Boost變換器運作良好。電路降壓頻率的逆變器是固定的,在60 HZ ,這是電力系統(tǒng)頻率。該過濾器LS,CS在輸出端口的逆變器是一種低本錢的能力,以改善波形的輸出電流。如果過濾器的高容量的使用,功率因數(shù)的系統(tǒng)將不統(tǒng)一,因為相位延遲。圖.4顯示波形是電流源逆變器。指標(biāo)代表交換期間的升壓斬波器,這個數(shù)字。國際法協(xié)會, IL
5、F代表波形電感電流各自的轉(zhuǎn)換和IDC代表輸出電流的逆變器。作為一個脈沖波形,輸出波形的六脈沖移轉(zhuǎn)換代表6波形開關(guān)頻率采用了數(shù)字信號處理器 TMS320F2812 產(chǎn)生的PWM 6相移信號電流源逆變本文。由于采用非對稱PWM模式,波形的輸出電流,這幾乎是逆變器的波形相似,六乘以開關(guān)頻率但不完全相同的。圖.5顯示了各自的電感電流和輸出電流的常規(guī)逆變器和逆變器相等的開關(guān)頻率。原文:Grid-connected photovoltaic system using current-source inverterRecentl
6、y, there has been a growing interest in alternative energy sources because fossil fuel and atomic power plants affect the environment and its stability (Nagao and Harada,
7、1997; Myrzlk, 2001). Among the various alternative source of energy, solar power stands apart as it is a clean and unlimited source of energy moreover, a considerable
8、0;amount of research has been conducted recently in this field. A solar power system consists of a photovoltaic module,a charge battery, and an inverter. Only inverters o
9、perating in current-source mode are included in the classification,since one of the aims of the PV inverter is to inject a sinusoidal current into the grid. To embod
10、y the operation of a single-phase-grid-connected inverter for photovoltaic module,it has general topology that is a standard full-bridge voltage source inverter (VSI), which can cr
11、eate a sinusoidal grid current (Kjaer et al., 2005; Kojabadi et al., 2006). This topology has two general problem as below. (1) A battery is essential to store
12、the electric energy generated by a solar power plant. But a charge battery has problems on its a short duration and pollution along with economic efficiency. However,
13、0;transmitting the generated energy directly into the utility line without using a battery can solve these problems. In this process, an interface circuit called an inverter
14、160;links the direct current (DC) output from the solar cell array to the AC power system. It does not matter if the output voltage of the current-source-inverter is
15、 lower than the power system voltage and in case of a shorted load or inverter malfunction, it does not have a surge current from a short-circuit (Myrzlk, 2001)
16、. (2) In general a microprocessor is used as the controller to achieve good characteristics when designing solar power systems with the current-source-inverters. In the contro
17、ller, to reduce the value of the inductance and the ripple of the output current, a high switching frequency is required for the inverter, however, the frequency is&
18、#160;restricted by the switching loss and sampling frequency of a processor. Fig. 1 shows the structure of a current-source PWM inverter used as the interface circuit for
19、 linking solar cells to the utility line (Mohan et al., 1995). It consists of fiveswitches, one inductor, and an LC filter at the output port. This inverter ope
20、rates in two switching modes. The QA switch only performs the chopping action, while the Q1Q4 switches determine the directions of the output voltage according to the
21、0;polarity of the power system. Therefore, compared with general full-bridge PWMinverter that performs complete chopping, this system reduces the switching loss.Fig. 2 shows the wa
22、veforms of the conventional current-source PWM inverter. It represents the waveforms of the output voltage and current, the current through the inductor, and the input signals
23、 to each switch.Fig. 3 shows the proposed six-pulse-shift current-source PWM inverter circuit that is used to reduce the switching frequency and improve the efficiency. Whenev
24、er the output voltage of solar cell module is higher or lower than the output voltage of the converter in compositing the current-source converter, it is required th
25、at the buck-boost converter operate well. The proposed circuit has buck-frequency of the inverter is fixed at 60 Hz, which is the value of power system frequency. Th
26、e filter (LS, CS) at the output port of the inverter is of a low capacity to improve the waveform of the output current. If a high capacity filter were
27、0;to be used, the power factor of the system would not be unity because of the phase delay.Fig. 4 shows the waveforms of the proposed current source PWM inverte
28、r. TS represents the switching period of the buck-boost choppers in this figure. ILAILF represent the waveforms of the inductor currents of the respective converters and IDC represents the output current of the inverter. As a operational waveform, the output waveform of
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