考虑孤岛划分策略的多源微网孤岛检测技术研究  

Study on Multi-Source Micro-Grid Islanding Detection Technique with Islanding Scheme

作　　者：杨国华[1,2] 肖龙[1,3] 杨涌涛[4] 王金梅[1] 

机构地区：[1]宁夏大学电气工程与自动化系,银川750021 [2]宁夏信息感知与智能沙漠重点实验室,银川750021 [3]民航宁夏空管分局,银川750001 [4]宁夏电力公司银川供电局,银川750011

出　　处：《电测与仪表》2014年第1期35-39,共5页Electrical Measurement & Instrumentation

基　　金：宁夏自治区自然基金资助项目(NZ12140)

摘　　要：孤岛检测是多源微网系统的必备功能之一,检测性能的优劣直接关系到设备的安全运行。鉴于目前采用有源检测法对分布式电源检测时会向系统注入扰动量,从而影响电能质量的现实,提出一种基于孤岛划分策略的可控短路阻抗测量孤岛检测方法:首先提出了基于不同负荷等级、内功率平衡等因素的孤岛划分策略,其次,分析了短路脉冲电流信号对电能质量的影响,最后利用matlab/simulink对系统孤岛、并网运行状态进行建模并仿真,结果表明阻抗测量法不仅能够有效准确的检出测孤岛状态,而且降低了对电能质量的影响。Islanding detection is one of the most essential functions for multi-source micro-grid system, which directly relates to equipment safety. Although active detection is widely used among islanding detection methods, it has influ- ence on power quality for the introduction of disturbance variable into the distributed power system. Therefore, an is- landing detection method using controlled short-circuit impedance measurement is proposed based on islanding scheme. First, the islanding scheme is proposed based on different load levels and internal power balance. Then the impact of short circuit pulse current signal on power quality is analyzed. MATLAB/Simulink is used for modeling and simulation of the system in islanding and grid-connected states. Experimental results show that the proposed method is reliable and accurate in detecting islanding conditions and reducing the impact on power quality.

关 键 词：孤岛检测 阻抗测量 多源微网 分布式电源 孤岛划分 

分 类 号：TM76[电气工程—电力系统及自动化]