Electric Power Quantities in the Presence of Harmonics - A Case Study

M. Kutija, L. Pravica
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引用次数: 1

Abstract

This paper analyzes electrical power quantities obtained by different power theories and measurement methods in the presence of harmonics. In this case, the power factor is significantly reduced, and the correct measurement of power and energy is challenging. International standards do not specify accuracy requirements for power and energy meters under non-sinusoidal conditions, and their accuracy is therefore questionable. On the other hand, penalization of low power factor operation and power factor correction are based on power and energy measurement. The guidelines for power measurement under non-sinusoidal conditions can be found in IEEE 1459 and are rarely used in practice. In this paper, a case study is carried out with measured data from an industrial plant where high harmonic distortions of current and voltage are present and active harmonic filters are installed. From the measured voltages and currents under sinusoidal and non-sinusoidal conditions, the electric power quantities are calculated according to IEEE 1459, the Budeanu theory, DIN40110, and two methods used by typical power meters: the quarter-cycle voltage delay method and the integral voltage phase shift method. The results have shown that typical power meters are subject to significant errors under industrial conditions. In addition, the electric power quantities determined by different power theories and standards can vary significantly under non-sinusoidal conditions.
谐波存在下的电量-一个案例研究
本文分析了在谐波存在的情况下,用不同的功率理论和测量方法得到的电功率。在这种情况下,功率因数显着降低,并且功率和能量的正确测量具有挑战性。国际标准没有规定非正弦条件下的功率和电能表的精度要求,因此其精度值得怀疑。另一方面,低功率因数操作的惩罚和功率因数校正是基于功率和能量测量。非正弦条件下的功率测量准则可以在IEEE 1459中找到,但在实际中很少使用。在本文中,用一个工业工厂的测量数据进行了案例研究,该工厂存在电流和电压的高谐波畸变,并安装了有源谐波滤波器。根据正弦波和非正弦波条件下的测量电压和电流,根据IEEE 1459、Budeanu理论、DIN40110以及典型功率计采用的四分之一周期电压延迟法和积分电压相移法计算电功率。结果表明,在工业条件下,典型的功率表存在较大的误差。此外,在非正弦条件下,由不同功率理论和标准确定的电量会有很大的变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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