三相四线制变频电网的谐波及无功电流检测

发布时间：2019-02-25 14:51

【摘要】：为了满足变频电网提高电能质量的需要,提出一种基于通用瞬时无功理论和正序基波滤波器的谐波、无功及不平衡电流检测方法。针对基于传统通用瞬时无功理论的方法在电源电压畸变或不对称时检测不准确的问题,提出了改进算法。详细分析了正序基波滤波器的特性,采用带有自适应参数的正序基波滤波器提取正序基波电压,采用平均值法获得平均功率,同时应用到改进算法中,适应了电网基频的各种变化,克服了低通滤波器在变频工况下使用的缺陷。在飞机交流变频电网并联APF系统中对所提方法进行了仿真验证,并与Ip-Iq改进法和PHC法进行了对比。研究表明所提方法在电网基频处于不同稳态值或在稳态值间快速变化时均能实现准确,快速地检测。与传统方法相比,具有检测精度高,受变频环境影响小的优点。
[Abstract]:In order to meet the need of improving power quality in frequency conversion power grid, a method of detecting harmonic, reactive and unbalanced current based on general instantaneous reactive power theory and positive sequence fundamental filter is proposed. In order to solve the problem of inaccurate detection of power supply voltage distortion or asymmetry based on the traditional instantaneous reactive power theory, an improved algorithm is proposed. The characteristics of the positive sequence fundamental filter are analyzed in detail. The positive sequence fundamental filter with adaptive parameters is used to extract the positive sequence fundamental voltage, and the average power is obtained by means of the average method, which is applied to the improved algorithm at the same time. It adapts to the change of fundamental frequency of power network and overcomes the defect of low-pass filter in frequency conversion. The proposed method is simulated and verified in the aircraft AC frequency conversion power grid parallel APF system, and compared with the improved Ip-Iq method and the PHC method. The results show that the proposed method can detect the fundamental frequency accurately and rapidly when the fundamental frequency is in different steady-state values or when the steady-state values change rapidly. Compared with the traditional method, it has the advantages of high detection precision and less influence by frequency conversion environment.
【作者单位】：西北工业大学自动化学院;
【基金】：高等学校博士学科点专项科研基金(20106102110032)
【分类号】：TM933.1

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