多机下无功扰动孤岛检测法的改进与参数设计  

Improvement and Parameter Design of Reactive Power Variation Islanding Detection Method for Multiple Inverters

作　　者：宋璇 彭特 白晨曦 段善旭[1] SONG Xuan;PENG Te;BAI Chen-xi;DUAN Shan-xu(Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《电力电子技术》2023年第12期105-108,共4页Power Electronics

摘　　要：针对孤岛检测中无功扰动(RPV)法在多台逆变器并联的情况下出现扰动稀释的问题,此处提出一种公共耦合点(PCC)频率与扰动状态相结合的方法。所提方法一方面在孤岛可能发生时重置扰动序列以实现多台逆变器RPV同步,另一方面将频率正反馈引入RPV幅值中以降低并网时扰动幅值。另外,此处对所提方法中的扰动幅值与同步阈值等参数进行理论分析与设计,使所提方法具有良好的检测效果。根据IEEE Std.1547中的反孤岛测试条例,通过仿真和实验验证了参数理论分析的正确性及所提方法的有效性和可靠性。Aiming at the problem that the reactive power variation(RPV)method for islanding detection has disturbances that cancel each other with multiple inverters connected in parallel,a method that combines the common coupling point(PCC)frequency with the state of disturbance is proposed.On the one hand,the proposed method resets the disturbance sequence when islanding may occur to synchronize the RPV of multiple inverters.On the other hand,it introduces frequency positive feedback into the RPV amplitude to reduce the impact of disturbance when grid-connected.In addition,the parameters such as disturbance amplitude and synchronization threshold in the proposed method are analyzed and designed theoretically,which makes the proposed method have good detection effect.Simulations and experiments are conducted according to the anti-islanding test regulations in IEEE Std.1547 to verify the validity and reliability of the proposed islanding detection method.

关 键 词：逆变器 孤岛检测 无功扰动 频率正反馈 

分 类 号：TM464[电气工程—电器]