As one of the most important energy, power quality is very important to the safe and stable operation of distribution network. According to national standards and evaluation requirements, a power quality evaluation method is proposed based on Minibatch K-Means algorithm and random forest algorithm. At first, abnormal data are processed. Processed data are clustered analysis by Minibatch K-Means algorithm. Imbalance sample is processed for clustering data by SMOTE. At last, labeled data are extracted features by random forest algorithm. The training model is saved. The simulation results show that power quality is evaluated by Minibatch K-Means algorithm and random forest algorithm, which solves the problem that labelless power quality data can't be classified by integrating multiple indexes. It achieves a comprehensive, efficient and rapid evaluation of power quality in distribution network.
KEYWORDS: Data acquisition, Wireless communications, Transformers, Control systems, Calibration, Sensors, Data centers, Standards development, Signal detection, Safety
Traditionally, the voltage and current sampling wiring for the device of low-voltage station area acquisition and monitoring is complex. Furthermore, there are many nodes, and each node is measured by wiring, consequently safety and efficiency have to face great challenges. This paper proposes a new idea of independent voltage and current sampling, using high-precision synchronous time synchronization and high bandwidth wireless transmission technology to promote the miniaturization design of wireless metering devices and smart terminals. It is verified that the synchronous timing accuracy of less than 10us, and the high bandwidth transmission above 1Mbps can be achieved to meet the requirement of 200Kbps. The results show that the ping-pong timing mechanism and broadband wireless technology used in this paper achieve the expected effect. It will improve ubiquitous sensing, data fusion and intelligent application capabilities of distribution equipment at all levels in the future.
KEYWORDS: Telecommunications, Computer architecture, Data acquisition, Software development, Data communications, Wireless communications, Control systems, Internet, Data processing, Statistical analysis
Previous research methods have focused on reuse of application software about embedded software development among smart distribution terminals. However, few investigations have been able to study the reconfigurable method of this software prospectively and in well-layered settings. Moreover, no studies have determined whether the embedded hardware development in the era of power Internet of things that influences the performance improvement of the software platform. The purpose of this paper was to explore the reconfigurable method of architecture level for embedded software development that can be realized only through four steps: start-data operation-control operation-end, and describes the design steps and the application of available high-performance techniques which greatly improves the efficiency of software development. By constructing the three-level reconfigurable software design method of ‘function element-component-system architecture’, this paper realizes the reconfigurable method of smart distribution terminal software development. We further confirmed the feasibility of this method by large-scale application of intelligent distribution terminal to low-voltage distribution station area.
According to the security problems caused by the software definition of distribution terminals in large-scale applications, it is of great significance to study the evaluation technology of terminal embedded operating system. This paper defines the architecture characteristics of micro application of distribution terminal by studying the software, establishes a progressive systematic detection system of micro application of distribution terminal, and forms the evaluation index and automatic test scheme of micro application of distribution terminal through the research of consistency verification modelling and test packaging method, which is helpful for the real realization of informatization, digitization and Modernization has certain scientific significance.
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