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多機(jī)光伏并網(wǎng)逆變器的孤島檢測(cè)技術(shù)研究

摘要：隨著新能源發(fā)電的迅速發(fā)展，越來(lái)越多的可再生能源被轉(zhuǎn)化為電能通過(guò)并網(wǎng)逆變器輸送到電網(wǎng)。并網(wǎng)逆變器要求具備孤島檢測(cè)功能，目前對(duì)光伏并網(wǎng)逆變器的研究主要集中于單機(jī)，通常對(duì)其輸出施加一定的擾動(dòng)以提高孤島檢測(cè)能力。本文從多機(jī)并網(wǎng)運(yùn)行的角度對(duì)孤島檢測(cè)方法進(jìn)行了研究。針對(duì)并網(wǎng)逆變器所常用的移頻與移相兩類主動(dòng)孤島檢測(cè)技術(shù)在多逆變器并聯(lián)工作下的相互聯(lián)系及內(nèi)在影響進(jìn)行了深入分析。同時(shí)給出這兩類方法下的逆變器孤島檢測(cè)設(shè)計(jì)注意事項(xiàng)及孤島算法參數(shù)選取方法，從而為多機(jī)光伏并網(wǎng)逆變器孤島檢測(cè)提供了理論指導(dǎo)。 敘詞：并網(wǎng)逆變器 光伏 孤島檢測(cè) 移頻 移相 Abstract：Due to the development of distributed generation, grid-connected converters are widely employed for renewable energy sources utilization. The islanding detection is a mandatory function for such converters. It usually injects perturbations in the converters' output to improve islanding detection effectiveness. The current research is mainly focusing on the islanding detection of individual converter. This paper is dedicated to investigating the strategies for multiple PV grid-connected converters operation. The characteristics of normally used active frequency shift and active phase shift islanding detection methods in multiple converters system are explored. The design principle and parameters selection rule of the two strategies are also presented. It provides basic islanding detection design guidance for multiple PV grid-connected converters system. Keyword：Grid-connected converter, PV, Islanding detection, Frequency shift, Phase shift

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