间谐波责任量化方法研究

发布时间：2018-03-24 14:06

本文选题：电能质量　切入点：间谐波　出处：《华北电力大学》2017年硕士论文

【摘要】：随着电网中非线性负荷的日益增多,间谐波问题也愈发突出。对间谐波源的责任进行量化,有助于建立科学规范的电能质量管理体系。间谐波源责任划分的前提是进行间谐波参数的提取,论文研究了传统IEC测量方法的不足,并采用了利用Prony方法进行参数提取。为有效进行间谐波源责任分摊,论文提出了三类责任指标,分别是间谐波电流、电压及功率。首先,根据间谐波源分布特性不一致的情况,论文构造了基于核密度估计与重要抽样相结合的蒙特卡洛方法,用以计算多间谐波源同次间谐波电流叠加,并在此基础上,根据向量叠加的原理计算了间谐波电流责任。其次,利用有功功率流向法将间谐波源定位,若间谐波来源为用电方,则计算各个用户的间谐波功率责任,此时功率责任定义为关注的间谐波源有功功率的绝对值占所有间谐波源有功功率绝对值之和的比重。最后,关于传统的间谐波电压责任,关键在于求取系统间谐波阻抗,本文提出了一种细分迭代法与k均值聚类相结合的方法,通过聚类中心的选取替代了精度的手动设置进行计算,并通过PSCAD仿真验证了该方法的有效性和准确性。
[Abstract]:With the increasing of nonlinear load in power network, the problem of interharmonics becomes more and more serious. It is helpful to establish a scientific and standardized power quality management system. The premise of the responsibility division of the interharmonic source is to extract the parameters of the interharmonics. This paper studies the shortcomings of the traditional IEC measurement methods. In order to allocate the responsibility of inter-harmonic source effectively, three kinds of responsibility indexes are proposed, namely, inter-harmonic current, voltage and power. Firstly, according to the inconsistent distribution of inter-harmonic source, the paper proposes three kinds of responsibility indexes: interharmonic current, voltage and power. In this paper, a Monte Carlo method based on kernel density estimation and important sampling is constructed to calculate the harmonic current superposition between multiple harmonic sources, and based on the principle of vector superposition, the responsibility of interharmonic current is calculated. The active power flow method is used to locate the inter-harmonic source. If the inter-harmonic source is the power source, the responsibility of the inter-harmonic power of each user is calculated. At this time, power responsibility is defined as the proportion of the absolute value of the active power of the interharmonic source concerned to the sum of all the absolute values of the active power of the interharmonic source. Finally, with regard to the traditional responsibility of inter-harmonic voltage, the key point is to calculate the inter-harmonic impedance of the system. In this paper, a subdivision iteration method combined with k-means clustering is proposed. The accuracy of the method is verified by PSCAD simulation.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM711

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