基于差分平面法的CT饱和检测及补偿研究  

Research of CT saturation detection and compensation based on differential plane method

作　　者：林国营 宋强 潘峰 李开成 王凌云 Lin Guoying;Song Qiang;Pan Feng;Li Kaicheng;Wang Lingyun(Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510000 [2]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《电测与仪表》2018年第17期146-152,共7页Electrical Measurement & Instrumentation

基　　金：广东电网有限责任公司电力科学研究院科技项目(GDKJXM00000011)

摘　　要：文中提出了电流互感器饱和检测、补偿的新方法。使用互感器二次侧电流的一阶差分作为横坐标、二阶差分作为纵坐标组成差分平面。利用差分平面上连续各点之间的距离来检测电流互感器饱和。在判断得到电流互感器饱和起始时刻后,使用改进的最小二乘法对饱和后的二次电流进行校正。PSCAD仿真证明基于差分平面的电流互感器饱和检测、校正方法在微弱饱和时仍有较高的精度,且不受互感器负载、剩磁等影响。A new method to detect and compensate the saturation of current transformer is proposed in this paper.The two order difference of secondary current is used as abscissa and as third order difference of secondary current as ordinate,and the differential plane is formed.The current transformer saturation is detected by the distance between successive points on the difference planes.After determining the starting time of the current transformer saturation,the modified least square method is used to correct the saturation current.PSCAD simulation shows that the method of saturation detection and correction of current transformer based on differential plane has a high accuracy in weak saturation,and is not affected by the load and remanence of the transformer.

关 键 词：饱和检测 饱和补偿 差分平面 最小二乘法 

分 类 号：TM935[电气工程—电力电子与电力传动]