基于32位浮点DSP的变压器保护的研制

【作者】 吴俊；

【导师】 徐习东；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 励磁涌流的快速鉴别仍然是当前变压器保护面临的一个难点，在实际应用中广泛采用二次谐波制动原理和间断角原理来鉴别励磁涌流。在间断角原理变压器差动保护中，需要测量差动电流导数波形的间断角。在数字式保护中，如果用差分代替求导将导致噪声的百分比误差随着采样频率的提高而剧增，本文对此进行了分析并提出了用分段样条函数最小二乘法来计算电流波形的导数值，以便在提高采样率的同时降低噪声误差的影响，并将其应用于基于32位浮点DSP的新型变压器保护装置。更多还原

【Abstract】 The fast discrimination between magnetizing in-rush current and fault current is a difficulty in transformer protection presently. To solve this problem, second harmonies restraint and dead angle are used widely in practical application. Dead angle of differential currents is measured when realizing the transformer differential protection based on the dead angle. In digital relay, the percentage of noise will increase rapidly with the increase of sampling rate when derivation calculus is substituted by sampled difference term. To solve this problem, a new method using fragment function integrated with the least square algorithm is proposed in this paper. The influence of white noise is greatly reduced and the accuracy of the dead angle calculation is nicely improved after adopting the new method. And it is also used in the new type device of transformer protection based on 32-Bit Floating-Point DSP.更多还原