摘要
新能源并网发电系统要求并网逆变器具备孤岛检测能力和孤岛保护功能。常见的孤岛检测算法包括主动频率偏移、无功注入、谐波注入等方法。对于多逆变器并联系统,常见的解决方案是“相同检测算法+同步注入”,即所有逆变器采用相同的孤岛检测算法并且同步注入,从而最大程度地降低逆变器之间的相互干扰。然而实际的多逆变器并联系统,可能存在不同型号的产品,不可避免存在孤岛检测算法不相同且各自孤岛检测运行时存在互相干扰的情况。针对该问题,提出了一种基于无功电流注入的并联孤岛检测方法,通过在公共耦合点处接入一个电流传感器以获得总电流数据,再通过主逆变器来集中控制无功注入总电流,从而实现集中式孤岛检测。给出了该方案的具体工作原理和仿真验证,仿真结果验证了所提出方法的可行性。
Islanding detection and anti-islanding protection are two basic functions for grid-tied inverter in new energy generation system.Some commonly used detection algorithm are active frequency shift,reactive power injection and harmonic injection,etc.For parallel inverters system,the most widely used scenario is same detection plus synchronous injection,which means all the inverters use the same detection algorithm and work synchronously in order to avoid the cross disturbance between inverters.However,for real parallel system with multiple inverters,the cross disturbance issue can't be avoided completely due to the fact that the system might contain different model of products.Regarding in this problem,we proposed a method for parallel system with multiple inverters based on reactive current injection.In our proposal,we insert a current transducer to obtain the aggregated current,and control the aggregated injecting current based on the signal from this transducer,so that centralized islanding detection can be implemented.The detailed operational theory and simulation verification of our proposal are presented.The simulation results verified the effectiveness of this method.
作者
朱选才
翁炳文
陈申
谢王杰
ZHU Xuancai;WENG Bingwen;CHEN Shen;XIE Wangjie(Hangzhou Branch of Wanbang Digital Energy Corporation,Hangzhou 311202,China;Hoymiles Power Electronics Inc.,Hangzhou 310022,China)
出处
《通信电源技术》
2022年第10期39-42,共4页
Telecom Power Technology
关键词
新能源发电
逆变器
孤岛
并联
无功电流注入
电流传感器
new energy generation
inverter
islanding
parallel
reactive current injection
current transducer
