【作者】 王小君；

【导师】 鲍海；

【作者基本信息】 华北电力大学（北京） ， 电力系统及其自动化， 2004， 硕士

【摘要】 本文对电流互感器进行了深入研究，查阅了大量相关资料，针对目前电力系统中某些负荷点变化范围较大，现有互感器不能满足计量要求的情况，进行宽量程电流互感器有源补偿方法的研究。围绕这一工作核心，作者完成了以下几项工作： (1)以实现宽量程电流互感器为目标，提出了基于Bang-Bang控制的有源补偿方法，采用双级电流互感器，将复杂的状态控制分量转化为偏差控制，该方法结构简单，调试方便，有源补偿器输出电流小，可以将0.2级的电流互感器经过补偿后提高到一次电流从额定值的2％变化到120％时，测量误差不超过一次电流额定值100％时准确度为0.1级的测量标准。 (2)针对电流系统中大量运行的0.5级电流互感器，利用物理相似原理在互感器二次构造相似电流互感器，提出基于Bang-Bang控制的相似激磁电流提取方法，能够最大程度的提取相似激磁电流。该方法对工频情况下由激磁电流造成的互感器误差有良好法的补偿效果。 (3)针对电力系统中大部分互感器都采用了匝数补偿的特点，分析了匝数补偿的特点，采用了反匝数补偿方法，以抵消匝数补偿对电流互感器误差特性的影响，恢复电流互感器原有误差特性，确保基于物理相似原理有源补偿方法的补偿效果。 (4)根据相似补偿方法和反匝数补偿方法的共同点，采用了电流互感器的综合有源补偿方法，使得基于物理相似原理的有源补偿法应用范围更广，并在理论上通过对综合补偿方法的误差分析，证明了综合补偿方法的可行性。通过分析相似电流补偿和反匝数补偿的特点，对电流互感器的比差和角差进行了协调控制，补偿效果明显。在实验中将准确度为2级的电流互感器经过补偿以后一次电流从额定值的5％变化到120％时，电流互感器的测量误差不超过一次电流额定值100％时准确度为0.2级的测量标准。更多还原

【Abstract】 In some place of electric system, the load change wide range and the existing current transformers can’t meet the measure request. On the base of consulting a great amount of materials, a deep research on wide range current transformer by active compensation was done in this paper. The author has finished the following several jobs in core of the centre:1) The active compensation method based on Bang-Bang control was put forward to realize the wide range current transformer. The method converts the complex statement space to I/O description by the two-stage current transformer. With the compensation method, the accuracy of 0.2 grade current transformer can be improved to less than the 0.1 grade standard at 100% rating when the primary side current is changed from 2% to 120% of the rating.2) An efficient model based on physical similarity was made to simulate the current transformers’ nonlinear magnetizing characteristics and to compensate error from outside. A similar magnetizing current extracting method based on Bang-Bang control was advanced to maximally extract the similar magnetizing current. This method can effectively compensate the current error caused by magnetizing current at power frequency.3) Because most current transformers have the turn compensation, the characteristic of which was analyzed and the anti-turn compensation model was adopted to offset the action for current transformer with turn compensation.4) A comprehensive active electronic compensation is given which keeps the characteristics of the similar magnetizing current compensation and adds the function of anti-turn compensation. The constitution of the compensation is simplified, and the working area is enlarged by anti-turn compensation method. The coordination control between the angle error and the ratio error was realized through analyzing the common characteristics between the similar magnetizing current compensation and the anti-turn compensation. With the compensator, the accuracy of an 2 grade current transformers can be improved to less than the 0.2 grade standard at 100% rating when the primary side current is changed from 2% to 120% of the rating.更多还原