Research on the Influence of Load Characteristics of Distributed Power Grid on Electric Energy Metering
Journal of Electrical and Electronic Engineering
Volume 6, Issue 3, June 2018, Pages: 94-103
Received: Jul. 6, 2018;
Accepted: Aug. 15, 2018;
Published: Sep. 15, 2018
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Li Pengcheng, Guizhou Power Grid Co., Ltd., Guiyang, China
Zhao Yantao, Wasion Group Co., Ltd., Changsha, China
Cong Zhongxiao, Guizhou Power Grid Co., Ltd., Guiyang, China
Zhao Yunbin, Guizhou Power Grid Co., Ltd., Guiyang, China
Xu Hongwei, Guizhou Power Grid Co., Ltd., Guiyang, China
Su Yuhua, Wasion Group Co., Ltd., Changsha, China
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As a large number of Distributed Generation Connecting Electric Grid put into operation, there are many impacts on power metering of power grid due to the problems of large fluctuation of load and frequent reverse of power, injecting DC component and harmonic component into power grid, generating voltage deviation, voltage fluctuation and flicker, and voltage unbalance. Measurement accuracy of traditional metering devices is difficult to guarantee. Therefore, the adaptability of traditional metering devices in the distributed power grid environment and the improvement of new technical methods to the Distributed Generation Connecting Electric Grid need to be studied. In this paper, through the analysis of the field operation data, it is proposed that the load fluctuation and frequent reverse of power can be solved by using the bidirectional and wide-range metering gateway meter; by analyzing the influence of the secondary transformer on the DC component, it is proposed that the influence of the DC component on the power metering can be almost ignored under the 0.5% DC component injection of the Distributed Generation Connecting Electric Grid. By analyzing zero flux technology, phase matching technology and high frequency sampling technology, a method to solve the problem of synchronous sampling of voltage and current under the influence of harmonics is proposed. By analyzing the point product and harmonic algorithm, the sampling rate requirement of accurate measurement of electric energy is proposed. A series of reasonable technical means and requirements are put forward in this paper, which greatly improves the power metering problem under the Distributed Generation Connecting Electric Grid.
Distributed Power, Wide Range, DC Component, Harmonics, Power Factor, Energy Metering
To cite this article
Research on the Influence of Load Characteristics of Distributed Power Grid on Electric Energy Metering, Journal of Electrical and Electronic Engineering.
Vol. 6, No. 3,
2018, pp. 94-103.
Copyright © 2018 Authors retain the copyright of this article.
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