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中文摘要：
根据孤岛发生时电压幅值变化特点及并网逆变器脉宽调制控制原理，提出一种基于调制比定向偏移控制的主动式孤岛检测方法。该方法采用调制比参数作为脉宽调制的电压控制信号，可在孤岛状态下改变系统公共耦合点的电压幅值。通过调制比定向偏移的控制方法，孤岛发生时可将电压幅值加速降低至检测阈值，实现无盲区孤岛检测，同时不会对电能质量产生负面影响。与传统的电压幅值检测方法相比，该方法有效提高了在不同有功功率环境中检测速度的稳定性，并消除了在最大功率状态时存在的检测失效问题，仿真结果证明了该方法的有效性。
英文摘要：
According to the voltage magnitude tendency toward islanding and the pulse width modulation control principle of grid-connected inverter,an active islanding detection method based on modulation ratio directional shift control is proposed. The modulation ratio,as the voltage control signal of pulse width modulation,is able to change the voltage magnitude in the islanding mode.The modulation ratio directional shift control method can rapidly decrease the voltage magnitude to detection threshold to eliminate the non detection zone without negative influence on power quality.Compared with the traditional islanding detection by voltage magnitude,this method has improved the stability of detection speed in different active power conditions while doing away with the ineffectiveness of the traditional method in the maximum active power mode.Simulation results verify the effectiveness of the method.
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