串联式中高压光伏方阵及系统探索

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Abstract This article explores a series-connected high-voltage photovoltaic block and system strategy, in order to deal with the problem, that the number of PV modules in series-connected is limited because of the withstand voltage of PV modules is no more than 1000V. With the aim to increase the generating capacity, the traditional strategy is using convergence devices to parallel the PV strings, which results in high currents, cable waste, power loss and high investment. This article presents a relatively high-voltage tandem photovoltaic block system strategy, which using the technique of maximum power point tracking (MPPT), DC/DC, security monitoring, power-adjusting high-voltage isolation component (isolation voltage >U_xmax), to isolate numbers of PV stringswith high-voltage. So that, the aims of increasing the input voltage of inverter and other DC devices, increasing the generating capacity, reducing the current and power loss, even reducing the rate of equipment failure, will be achieved. Furthermore, it also could cancel the convergence devices while power-adjusting the requirements of PV strings with different capacity, making PV transmitting current in high-voltage.

Key words： power-adjusting high-voltage isolation component of PV string series-connected PV strings series-connected high-voltage photovoltaic block withstand voltage of PV string

Published: 10 February 2015

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	Articles by authors
	Wang Zhe
	Liu Limin
	Wang Shengli
	Lin Yanmei
	Liu Xuanxuan

Cite this article:

Wang Zhe,Liu Limin,Wang Shengli等. The Exploration of Series-Connected High-Voltage Photovoltaic Block and System[J]. Electrical Engineering, 2015, 16(02): 137-144.

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http://dqjs.cesmedia.cn/EN/Y2015/V16/I02/137