Take Africa -- there are about 110 million households in the region without access to the grid, compared with only 20 million who are connected.

拿非洲为例，在这一地区，有大约一亿一千万的家庭没有介入电网，与之形成对比的是只有两千万家庭接入电网。

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Not only the of maximum power point tracking and islanding protecting techniques, but also the technique for inverter to connected with grid are discussed in detail.

通过对光伏并网逆变器最大功率点跟踪、孤岛效应和并网控制等问题的分析，提出了具体的解决方案。

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