A Modified Aalborg Inverter Extracting Maximum Power From One PV Array Source
A Modified Aalborg Inverter Extracting Maximum Power From One PV Array Source
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DOI：
10.24295/cpsstpea.2019.00011
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Houqing Wang;Weimin Wu;Shuai Zhang;Yuanbin He;H. Chung;F. Blaabjerg
中科院分区：
文献类型：
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作者：
Houqing Wang;Weimin Wu;Shuai Zhang;Yuanbin He;H. Chung;F. Blaabjerg
分布式光伏发电（DPVG）系统已成为越来越重要的，在最近几年，由于能源夹点和空气污染。并网逆变器作为DPVG系统中不可缺少的组成部分，受到了广泛的研究关注。在各种构造者中，奥尔堡逆变器被提出作为光伏阵列和电网之间的接口的候选者，具有一些潜在的优点，例如输入直流电压范围宽、效率高、成本低和无泄漏电流。然而，对于传统的奥尔堡逆变器，为了获得对称的电网注入电流，当由光伏阵列产生的输入直流电压不相等时，必须丢弃部分输入直流能量，这将降低整个系统的转换效率。本文提出了一种改进的奥尔堡逆变器与一个单一的输入直流电源，以提取光伏阵列的最大直流能量。通过等效电路说明了工作原理。控制策略的目的是平衡电容电压和平滑的电网注入电流。一台110 V/50 Hz/800 W的样机验证了所提出的逆变器的有效性以及控制策略的有效性。
Distributed Photovoltaic Generation (DPVG) systems have become more important in recent years because of energy pinch and air pollution. Grid-tied inverters, as the indispensable parts of the DPVG systems, have drawn a lot of research attentions. Among various constructors, the Aalborg inverter was proposed as a candidate for the interface between the PV arrays and the power grid for some potential advantages, such as the wide range of input DC voltages, high efficiency, low cost and no leakage current. For a conventional Aalborg inverter, however, in order to gain a symmetrical gird-injected current, when the input DC voltages generated by the PV arrays are not equal, part of the input DC energy has to be discarded, which will reduce the conversion efficiency of the whole system. In this paper, a modified Aalborg inverter with a single input DC source is proposed to extract the maximum DC energy of PV arrays. The operating principle is illustrated via equivalent circuits. The control strategy is designed to balance the capacitor voltages and smooth the grid-injected current. A 110 V/50 Hz/800 W prototype has been built to verify the validity of the proposed inverter together with the effectiveness of the control strategy.