共查询到20条相似文献，搜索用时 156 毫秒
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电力系统上的电能计量装置普遍是由有功和无功电能表、电压和电流互感器以及二次回路等重要部分组成,这使得电能计量装置计量的准确性不能单纯的依赖于电能表计量精准度的提升及计量误差的降低,这主要是因为电能计量装置中的电流互感器及电压互感器自身存在角差及比差,且电压互感器所处的二次回路上普遍存在着相对严重的压降,这均影响着电能计量装置的综合性计量误差。文章在分析介绍电能计量装置综合误差的基础上,立足于电能计量装置的组成结构,功电能表、无功电能表、电压互感器、电流互感器及二次回路等,开展综合误差的规范化管理可实现综合误差的有效降低。 相似文献
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谢方和 《大科技．科学之谜》2013,(21):80-81
电能计量装置的准确性直接影响着供电方和用电方的切实利益。因此,降低电能计量装置的误差,提高电能计量装置的准确性,做到准确、公正计量,是非常必要的。在实际运行中,影响电能计量装置准确性的因素较多,具体包括：电能表误差、二次回路误差、二次导线压降误差、电流互感器误差以及电压互感器误差等。为了优化电能计量装置的准确性,就应当采取选用合格的电能表,选用恰当的电流互感器与电压互感器,降低二次回路电压降以及强化管理等措施。 相似文献
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浅谈电能计量装置常见的技术问题及解决措施 总被引：1，自引：0，他引：1
电能计量装置是电力系统电能计量的重要设备,它的准确可靠直接关系到电力系统的经济效益。国内应用的电能计量装置主要由电能表、电压互感器、电压互感器二次回路导线等组成。近年来,随着市场经济的发展,以及商业化运营的管理日趋成熟,国家电力系统对电能计量装置的准确性越来越重视,各计量点的电能计量装置的综合误差就显得尤为重要,特别关键的是电能计量装置的综合误差是追补电量的重要依据。 相似文献
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电能计量装置包含各种类型的电能表,计量用电压、电流互感器及其二次回路、电能计量柜(箱)等。其中,电压互感器及其二次回路如果配置和使用不当,将会产生较大的计量误差。为了保证计量量值的准确、统一和计量装置的安全、可靠,加强对电压互感器及其二次回路的管理便显得尤为重要。下面将对电能计量装置中电压互感器及其二次回路产生计量误差的原因做详细的论述。 相似文献
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引起电能计量综合误差的原因是多种多样的,本文主要从电能表、电流互感器以及电压互感器三个方面分析了导致电能计量装置综合误差的原因,并提出了相应的措施。 相似文献
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电能计量装置是电能贸易结算的关键设备。国家技术监督部门及电力部门对电能计量装置都有严格的管理规定。但是,长期以来,人们都重视计费电能表的准确度而忽视提高计量CT（电流互感器）、PT（电压互感器）的准确度。这种不正确的认识,使现场电能计量装置的综合误差,常难以达到有关规定的要求。 相似文献
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在对供配电系统中电能计量装置的现状进行总结后,认真分析了电度表、计量用电流互感器、计量用电压互感器配置不合理给电能计量带来的危害,认识到只有当计量装置在选型和安装时具有合理的配置才能保证计量装置高效准确的进行电能计量统计. 相似文献
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对于供电企业来说,电能计量装置的准确性直接关系到其公司效益,关系到电力交易的公平公正。长期以来,电力工作者也一直致力于降低电能计量装置的误差,提高其准确性。在实际操作中,对电能计量装置准确性造成影响的因素众多,包括:表计误差、二次回路误差、线损误差、互感器误差等等。本文针对这些误差进行研究,并就解决方案进行了探讨。 相似文献
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Flow-through gold film perforated with periodically arrayed sub-wavelength nano-holes can cause extraordinary optical transmission (EOT), which has recently emerged as a label-free surface plasmon resonance sensor in biochemical detection by measuring the transmission spectral shift. This paper describes a systematic study of the effect of microfluidic field on the spectrum of EOT associated with the porous gold film. To detect biochemical molecules, the sub-micron-thick film is free-standing in a microfluidic field and thus subject to hydrodynamic deformation. The film deformation alone may cause spectral shift as measurement error, which is coupled with the spectral shift as real signal associated with the molecules. However, this microfluid-induced measurement error has long been overlooked in the field and needs to be identified in order to improve the measurement accuracy. Therefore, we have conducted simulation and analytic analysis to investigate how the microfluidic flow rate affects the EOT spectrum and verified the effect through experiment with a sandwiched device combining Au/Cr/Si3N4 nano-hole film and polydimethylsiloxane microchannels. We found significant spectral blue shift associated with even small flow rates, for example, 12.60 nm for 4.2 μl/min. This measurement error corresponds to 90 times the optical resolution of the current state-of-the-art commercially available spectrometer or 8400 times the limit of detection. This really severe measurement error suggests that we should pay attention to the microfluidic parameter setting for EOT-based flow-through nano-hole sensors and adopt right scheme to improve the measurement accuracy. 相似文献
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《Journal of The Franklin Institute》2022,359(12):6503-6522
This paper focuses on the dynamic event-based recursive filtering problem for a class of time-varying networked systems under the encoding-decoding mechanism. For the purpose of saving energy consumption, a dynamic event-triggered protocol is applied to determine whether the measurement of the sensor is transmitted or not. In the transmission process of the measurement, a dynamic-quantization-based encoding-decoding mechanism is introduced to encrypt the transmitted measurement. In specific, the measurement outputs are first encoded into codewords which are then transmitted from the encoder to the decoder. After received by the decoder, the codewords are first decoded and then sent to the filter. A bounded uncertainty is introduced to characterize the difference between the original measurement and the decoded measurement. This paper is devoted to developing a recursive filtering algorithm for the considered system such that a minimal upper bound on the filtering error covariance is derived through appropriately designing filter gain. Moreover, the mean-square exponential boundedness of the filtering error is analyzed. Finally, the efficiency and superiority of the proposed algorithm are verified through two simulation examples. 相似文献
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《Journal of The Franklin Institute》2023,360(12):8973-8996
In this paper, the measurement outlier-resistant target tracking problem is investigated in wireless sensor networks (WSNs) with energy harvesting constraints. Each WSN node can acquire energy stochastically from surroundings. No matter whether the WSN node acquires energy or not, the WSN node’s measurement can be transmitted if the energy amount of the WSN node is greater than zero. In such a case, the sensor energy-induced missing measurement (SE-IMM) phenomenon may occur. The objective of this paper is to develop a solution for the considered target tracking problem by devising the filter including a saturation constraint such that, in the simultaneous presence of outliers and the SE-IMM phenomenon, the tracking performance can meet the given performance index. Firstly, the relation between the energy level of the WSN node and its probability distribution is computed recursively. Then, an upper bound of the tracking error covariance is derived which is minimized by appropriately choosing the filter parameter. Finally, the feasibility of the proposed target tracking scheme is validated by conducting a set of comparative experiments and the relationship between the energy of the WSN node and the tracking performance is also disclosed. 相似文献
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Edwin Engin Yaz Chung Seop Jeong Yvonne Ilke Yaz 《Journal of The Franklin Institute》2007,344(6):918-928
A class of discrete-time nonlinear system and measurement equations having incrementally conic nonlinearities and finite energy disturbances is considered. A linear matrix inequality-based design approach is presented, which guarantees the satisfaction of a variety of performance criteria ranging from simple estimation error boundedness to dissipativity. Some simulation examples are included to illustrate and provide support to the proposed design methodology. 相似文献
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Cong Huang Bo Shen Hongwei Chen Huisheng Shu 《Journal of The Franklin Institute》2019,356(15):8870-8889
In this paper, a dynamically event-triggered filtering problem is investigated for a class of discrete time-varying systems with censored measurements and parameter uncertainties. The censored measurements under consideration are described by the Tobit measurement model. In order to save the communication energy, a dynamically event-triggered mechanism is utilized to decide whether the measurements should be transmitted to the filter or not. The aim of this paper is to design a robust recursive filter such that the filtering error covariance is minimized in certain sense for all the possible censored measurements, parameter uncertainties as well as the effect induced by the dynamically event-triggered mechanism. By means of the mathematical induction, an upper bound is firstly derived for the filtering error covariance in terms of recursive matrix equations. Then, such an upper bound is minimized by designing the filter gain properly. Furthermore, the boundedness is analyzed for the minimized upper bound of the filtering error covariance. Finally, two numerical simulations are exploited to demonstrate the effectiveness of the proposed filtering algorithm. 相似文献
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