Implementation of Grid Synchronization Methods on a Real Time Development System

The paper presents a study regarding the implementation of two representative grid synchronization methods, intended to be used in the control structure of a three phase switch mode voltage rectifier. The methods considered are the Synchronous Reference Frame Phase Locked Loop (SRF PLL) and the Double Synchronous Frame Phase Locked Loop (DSRF PLL), respectively. These synchronization methods have been compared on a real time development system type dSpace 1104 from the point of view of their performance in case of an unbalanced mains voltage system. Finally, the influence of the chosen grid synchronization method on the performance of a synchronous reference frame controlled three-phase switch mode voltage rectifier is studied by simulation, and better results are demonstrated to be provided by the use of the DSRF PLL.

MODEL OF SWITCH-CONTROLLED PWM STRUCTURE FOR ANALYSIS OF PULSE VOLTAGE CONVERTERS WITH ARBITRARY TOPOLOGY

The article considers the problems of analyzing DC-DC voltage converters and analyzes the advantages, disadvantages, as well as the scope of full switched and averaged continuous models of the converters. The feasibility of using the complex of two models (full switch model and averaged continuous model) for analyzing their operation is proved. The general approach to the construction of continuous models of DC-DC voltage converters based on state-space averaging method is considered. Disadvantages of the averaged models using a classic approach are shown. The relevance of the development of universal continuous models of DC-DC converters is substantiated. The possibility of creating such models using averaged models of PWM switching structure included in the DC-DC voltage converter is shown. Analyzed the typical structure of the switch-mode power supply with feedback. An averaged model of the switching structure is proposed, basing on which continuous models of DC-DC converters with any topology can be built. The processes occurring in this switching structure in the mode of continuous and discontinuous choke current are analyzed. A method for constructing continuous models of the main types of DC-DC voltage converters based on switching structure averaged model is proposed. The adequacy of continuous models obtained by this method has been proven. The results of modeling transients on the continuous and full switch models for inverting voltage regulator are demonstrated. The possibility of accounting in the model of active resistances of switches and cumulative choke is shown. The possibility of using the proposed model to obtain the open loop transfer functions is demonstrated, in particular, the characteristics of the duty factor - output voltage. These transfer functions can be used to synthesize control system compensating circuits of the switch-mode power supply. The possibility of using a single generalized averaged model of the switching structure to build continuous models of converters with complex topology using both the Voltage Mode and Current Mode is shown. This creates prerequisites for developing a universal averaged continuous model for DC-DC converter based on this principle

An Integrated Cost-Aware Dual Monitoring Framework for SMPS Switching Device Diagnosis

The ability of a switch-mode AC/DC power supply to shrink supplies is a benefit and a requirement for most electronic devices with limited space. Major failures in switch-mode power supply (SMPS) during adverse working conditions are subject to mostly the switching devices and capacitors. For effective condition monitoring of the SMPS, dual (or multiple) sensing provides a more reliable standpoint against the traditional single sensing techniques as it provides a more comprehensive paradigm for accurate condition monitoring. This study proposes an integrated approach to SMPS condition monitoring by exploiting statistically extracted features from current and voltage signals for system fault diagnosis based on electrical stress. Following a correlation-based feature selection approach, salient features were utilized for improved fault detection and isolation (FDI) using ML-based classifiers. Diagnostic results by the classifiers reveal that the random forest and gradient boosting classifiers are highly reliable but computationally expensive when compared with the others while the decision tree was quite cost-efficient with reliable diagnostic results. The proposed framework is effectively applicable for use in diagnosing the switching devices and classification at different states.

EXPERIMENTAL VERIFICATION OF THREE MODE CONTROLLER FOR HOME APPLIANCE USING WIRELESS TECHNOLOGY

An attempt is made to enhance the automation and sophistication of a home appliance. In this work, electric lamp is considered as a home appliance and it is controlled through three different modes. Technology is a never-ending process, the home automation is a well-known field of recent research, which makes the customer to reach the next level of sophistication. One such next level is presented in this article. The proposed paper is about design, experimentation and testing of three-way control for a lamp, using low cost microcontroller, Bluetooth module and android mobile application. The three modes of control are manual switch mode, Light Dependent Resistor (LDR) mode and Bluetooth based Wireless communication mode. The work is initially simulated using Proteus 8 Professional Application and then implemented as a real time working model. Also, the working performances were tested using the Simulation and developed working model. The control in Bluetooth mode is based on an Android Application. A dedicated Android Application is developed for testing the developed working model, using MIT App Inventor. ABSTRAK: Percubaan dibuat untuk meningkatkan automasi dan kecanggihan perkakas rumah. Dalam karya ini, lampu elektrik dianggap sebagai perkakas rumah dan ia dikendalikan melalui tiga mod yang berbeza. Teknologi adalah proses yang tidak pernah berakhir, automasi rumah adalah bidang penyelidikan baru-baru ini, yang menjadikan pelanggan mencapai tahap kecanggihan yang seterusnya. Satu tahap seterusnya ditunjukkan dalam artikel ini. Makalah yang dicadangkan adalah mengenai reka bentuk, eksperimen dan pengujian kawalan tiga arah untuk lampu, menggunakan mikrokontroler kos rendah, modul Bluetooth dan aplikasi mudah alih android. Tiga mod kawalan tersebut ialah mod suis manual, mod Perintang Bergantung Cahaya (LDR) dan mod komunikasi Tanpa Wayar berasaskan Bluetooth. Karya ini pada mulanya disimulasikan menggunakan Proteus 8 Professional Application dan kemudian dilaksanakan sebagai model kerja masa nyata. Juga, prestasi kerja diuji menggunakan Simulasi dan model kerja yang dikembangkan. Kontrol dalam mod Bluetooth didasarkan pada Aplikasi Android. Aplikasi Android khusus dikembangkan untuk menguji model kerja yang dikembangkan, menggunakan MIT App Inventor.