PQD

Online monitoring of Power Quality disturbances ( PQD) is a direct and effective way to obtain PQ information, and it has become a hot research subject in IEC technical fields.

电能质量扰动在线监测是获取电能质量信息的直接有效途径，其方法研究业已成为电工技术领域的热门前沿研究课题。

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Amplitude deviation ( AD) and phase deviation ( PD) are the important compositions of power quality disturbance ( PQD).

幅度变化（AD）与相位变化（PD）是电能质量扰动的重要组成部分。

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Aimed at power quality disturbance ( PQD), several transformation-based analysis methods are introduced. By comparing those methods, a method is brought forward based on the wavelet packet ( WP) energy chart.

针对电能质量扰动问题，通过介绍几种基于变换理论的电能质量扰动检测和分类方法，对比分析各种方法之利弊，提出了基于小波包能量谱的电能质量短期扰动检测与分类新方法。

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As an example of the application of PQD the design of SE was introduced.

结合热气机样机的开发设计,介绍了产品质量设计方法的具体应用.

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A new classification method for power quality disturbance ( PQD) based on singular value ( SV) feature vectors of S-transform ( ST) time-frequency matrixes ( TFM) has been proposed.

提出了一种基于S变换时频矩阵奇异值特征向量的电能质量扰动分类方法。

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In the present paper, we obtain stability of sums of weighted for pairwise PQD sequences and pairwise NQD sequences.

本文讨论了两两PQD列及两两NQD列两类相关列的加权和的稳定性。

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Objective To observe the mechanism of action panax quinquefolium diolsaponins ( PQDS ) on anti-ventricular remodeling in rats.

目的:观察西洋参叶二醇组皂苷 ( PQDS ) 对抗大鼠心室重构的作用机制.

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Investigating the levels of lipid peroxidase ( LPO) and superoxide dismutase ( SOD) in serum, bronchoalveolar lavage fluid ( BALF) and alveolar macrophage ( AM) were determined in 40 chronic bronchitis patients with Pulmonary Qi Deficiency ( PQD) Syndrome and 36 normal subjects.

检测40例慢性支气管炎肺气虚证患者及36名健康人外周血、支气管肺灌洗液（BALF）中超氧化物歧化酶（SOD）、过氧化脂质（LPO）以及肺泡巨噬细胞（AM）内SOD含量。

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The proposed algorithm is simple and suitable for programming with low computational load, and case study shows that it locates the PQD sources automatically and accurately.

算例分析表明，该算法不仅可实现配电网络中电能质量扰动源的自动、精确定位，而且具有简洁直观、计算量小、适于计算机编程实现等优点。

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