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发明公开
CN107221950A 一种基于SVG调节功率因数的光伏电站的孤岛检测法 无效 - 驳回

一种基于SVG调节功率因数的光伏电站的孤岛检测法
摘要：
本发明公开了基于SVG调节功率因数的光伏电站的孤岛检测法，包括以下步骤：(1)光伏电站输出的有功功率等于或高于阈值时执行步骤(2)，光伏电站输出的有功功率低于阈值时执行步骤(3)；(2)SVG按照光伏电站并网运行时系统对电压幅值或功率因数的要求输出无功功率，如果光伏电站处于孤岛运行，进行孤岛检测并执行步骤(4)；(3)光伏电站系统输出到PCC处的功率因数比预定值降低0.05～0.1，如果PCC处频率变化超出阈值，光伏电站处于孤岛运行，光伏电站输出的有功功率超出或等于阈值时，光伏电站系统输出到PCC的功率因数为确定值；(4)采集PCC处的三相电压信号，计算电压幅值和频率；(5)根据电压幅值和频率的数值判断系统的运行状态。
摘要（英）：

The invention discloses an island detection method for a photovoltaic power plant based on SVG regulating power factors. The island detection method comprises the following steps: (1) executing the step (2) when the active power outputted by the photovoltaic power plant is equal to or higher than a threshold value, and executing the step (3) when the active power outputted by the photovoltaic power plant is lower than the threshold value; (2) the SVG outputting reactive power according to the requirements of the voltage amplitude or power factor as the photovoltaic power plant is under grid-connected operation, and carrying out the island detection and performing the step (4)if the photovoltaic power station is under islanded operation; (3) the power factor output to the PCC by the photovoltaic power plant system being reduced by 0.05 to 0.1 than the predetermined value, and the power factor output to the PCC by the photovoltaic power plant system being a determined value if the frequency change at the PCC exceeds the threshold, the photovoltaic power station is under islanded operation and the active power outputted by the photovoltaic plant exceeds or equals to the threshold; (4) collecting the three-phase voltage signal at PCC, calculating the voltage amplitude and frequency; and determining the operating status of the system according to the voltage amplitude and the frequency value.

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