Study on the detection methods of harmonic and reactive current in rural power system | 农村电网中谐波与无功电流检测方法研究
2012
Guo Wei, Shanxi Agricultural University, Taigu (China), College of Engineering | Cao Jing, Department of Animal Husbandry and Veterinary, Beijing (China), Beijing Vocational College of Agriculture | Chen Zujian, Lenze Drive Systems (Shanghai) Co.Ltd, Shanghai (China)
chinois. 对谐波与无功电流检测方法进行了对比,提出基于瞬时无功功率理论的谐波与无功电流检测方法适合农村电网, 对其中3种方法进行了仿真对比研究。仿真结果表明, 农村电网电压发生畸变时, p-q检测法得到的基波电流畸变最为厉害, ip-iq法较为接近标准正弦波, 但检测精度不高。d-q法得到的基波电流为标准正弦波形式, 不仅可检测出谐波电流, 还能得到准确的基波有功电流, 且不受电源电压畸变的影响。该方法能够准确、实时的跟踪电网谐波电流变化, 其检测精确度和准确度都符合农村电网的要求。
Afficher plus [+] Moins [-]anglais. By comparing the detection methods of harmonic and reactive power, detection methods based on the theory of instantaneous reactive power was raised for use in rural power system. Simulations by comparing the three methods showed that when the rural power voltage was aberrated, the fundamental circuit detected by p-q method has seriously distorted, those detected by ip-iq method approximated standard sine wave, but with low accuracy. The fundamental circuit detected by d-q method was absolutely standard sine wave, can not only detect harmonic circuit, but also get accurate fundamental active circuit. Besides, it did not influenced by power voltage distortion. This method can track the real-time change of harmonic circuit accurately, and the detection precision and accuracy can satisfy the demands of rural power system.
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