【摘要】：光伏陣列的部分遮擋,使陣列功率電壓特性呈現(xiàn)多峰,現(xiàn)有最大功率追蹤方法在速度、準(zhǔn)確度和可操作性方面仍有較大改進(jìn)空間。首先,利用恒流源特性提出全局最大功率追蹤新方法,即調(diào)整電流線(xiàn)法,該方法在P-U特性上沿著電流線(xiàn)斜率單調(diào)變化的方向不斷調(diào)整電流線(xiàn);然后對(duì)所提方法利用恒流源特性加快電流搜索過(guò)程并提高搜索終止條件的準(zhǔn)確性;再?gòu)乃阉鬟^(guò)程和搜索終止條件兩方面對(duì)現(xiàn)有0.8倍開(kāi)路電壓法進(jìn)行改進(jìn);最后,以某光伏陣列3種遮擋模式以及遮擋模式間的變化為例,通過(guò)仿真驗(yàn)證所提兩種方法(調(diào)整電流線(xiàn)法和改進(jìn)的0.8倍開(kāi)路電壓法)均能準(zhǔn)確、快速地追蹤到全局最大功率點(diǎn)。所提方法為多峰最大功率追蹤提供了新的思路。
[Abstract]:The partial occlusion of the photovoltaic array makes the power and voltage characteristics of the array multi-peak. There is still much room for improvement in speed accuracy and maneuverability of the existing maximum power tracking methods. Firstly, a new method of global maximum power tracing is proposed by using constant current source characteristics, namely, the method of adjusting current line, which adjusts the current line in the direction of monotonic change of current line slope in P-U characteristic. Then the proposed method uses the characteristics of constant current source to speed up the current search process and improve the accuracy of the search termination condition. Then the existing 0.8 times open circuit voltage method is improved from the two aspects of the search process and the search termination condition. Finally, Taking the variation of three occlusion modes and occlusion modes of a photovoltaic array as an example, the simulation results show that the proposed two methods (adjusting current line method and improved 0.8 times open circuit voltage method) are accurate and can quickly track the global maximum power point. The proposed method provides a new idea for multi-peak maximum power tracking.
【作者單位】： 天津大學(xué)智能電網(wǎng)教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：天津市科技計(jì)劃項(xiàng)目(13TXSYJC40400)
【分類(lèi)號(hào)】：TM615

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本文編號(hào)：2286010