基于逆变电源的孤岛检测方法研究

An isolated island detection methods of the inversion power supply

分析了现有的孤岛检测方法的优、缺点,提出了频率-功率反馈的逆变器孤岛检测方法。通过研究逆变电源的控制以及反馈原理,采用abc-dq0变换机制实现频率-无功反馈,增加逆变器无功输出与无功负荷的不匹配程度,加速频率变化,使之能够有效检测孤岛。理论分析及PSCAD仿真结果证明,此方法简单有效,能够有效减小检测盲区,且对电能质量影响微弱。

Analyzes the merits and demerits of the current isolated island detection methods, puts forward the isolated island detection methods of frequency and power feedback inverter. Through studying the control and feedback principle of the inversion power supply, uses abe-dq0 convertion mechanism to realize the frequency and reactive power feedback, increases the unmatchable degree between the reactive power export and reactive power load of the inverter, accelerates the frequency change, detects the isolated island effectively. The theory analysis and PSCAD simulation results prove the method is simple and effective, which can reduce the blind area of the detection and has weak effect on the electric energy quality.