Digital excitation systems—Growing obsolescence of aging systems

2017 ◽  
Author(s):  
C. Schaefer
Keyword(s):  
Digital Excitation

scholarly journals Simulation and Test Bed of a Low-Power Digital Excitation System for Industry 4.0

Processes ◽  
2018 ◽  
Vol 6 (9) ◽  
pp. 145 ◽  
Author(s):  
Jun-Ho Huh ◽  
Hoon-Gi Lee
Keyword(s):  
Low Power ◽  
Large Scale ◽  
Technical Assistance ◽  
System Analysis ◽  
Economic Effect ◽  
Critical Element ◽  
Test Bed ◽  
Actual System ◽  
Excitation System ◽  
Digital Excitation

Since modeling and simulation are the two most effective tools that can be used in the design or analysis process, they play a vital role in developing such system. In many cases, they are the only possible means of making a safe engineering decision for a new concept of process for a large-scale system. Elsewhere, they are used as a critical element in the analysis of energy systems or to suggest a method of developing a novel and effective energy system model. Thus, in this study, simulations and test bed experiment were carried out to assess a low-power digital excitation system in order to validate its effectiveness. The excitation systems currently used by most of the power stations in the Republic of Korea were installed during the 1970s or 1980s. Unfortunately, it is difficult to seek technical assistance for them as they depend on foreign technologies, requiring a large sum to be paid when requesting one or more engineers to be dispatched. As such, technical updates have always been made by foreign companies, since it is not easy to make modifications to the system without the help of the original system developer. The technology developed in this study was designed to address such problem. The inability to conduct a test for an actual system can be solved by using a power system analysis program to analyze the characteristics of the controller. The study confirmed the system’s effectiveness, and the Test Bed was proven to be flexible and adequate for the experiment. The proposed excitation system is expected to increase the stability and economic effect of the system by optimizing existing systems. In the future, the authors plan to focus on student education by establishing an education system that allows students to learn about the digital excitation system and its simulation.

scholarly journals A Digital Calibration Technique of MEMS Gyroscope for Closed-Loop Mode-Matching Control

Micromachines ◽  
2019 ◽  
Vol 10 (8) ◽  
pp. 496
Author(s):  
Cheng Li ◽  
Bo Yang ◽  
Xin Guo ◽  
Lei Wu
Keyword(s):  
Theoretical Analysis ◽  
Real Time ◽  
Closed Loop ◽  
Mode Matching ◽  
Loop Analysis ◽  
Calibration Technique ◽  
Mems Gyroscope ◽  
Real Time Mode ◽  
Digital Excitation ◽  
Bias Instability

A digital excitation-calibration technique of dual-mass MEMS gyroscope for closed-loop mode-matching control is presented in this paper. The technique, which takes advantage of the symmetrical amplitude response of MEMS gyroscope, exploits a two-side excitation signal to actuate the sense mode to obtain the corresponding DC tuning voltage. The structural characteristics of dual-mass decoupled MEMS gyroscope and the tuning principle of excitation-calibration technique are introduced firstly. Then, the scheme of digital excitation-calibration system for the real-time mode-matching control is presented. Simultaneously, open-loop analysis and closed-loop analysis are deduced, respectively, to analyze the sources of tuning error and system stability. To verify the validity of the scheme and theoretical analysis, the system model was established by SIMULINK. The simulation results are proved to be consistent with the theoretical analysis, verifying the feasibility of the digital excitation-calibration technique. The control algorithms of the system were implemented with a FPGA device. Experimental results demonstrate that digital excitation-calibration technique can realize mode-matching within 1 s. The prototype with real-time mode-matching control has a bias instability of 0.813 ∘ /h and an ARW (Angular Random Walk) of 0.0117 ∘ / h . Compared to the mode-mismatching condition, the bias instability and ARW are improved by 3.25 and 4.49 times respectively.

Research and Simulation of Excitation Regulator Model Based on DSP

2013 ◽  
Vol 732-733 ◽  
pp. 697-701
Author(s):  
Zhi Tian Zhang ◽  
Xiao Ping Shi ◽  
Xiao Ling Shi
Keyword(s):  
Digital Signal Processor ◽  
Digital Signal ◽  
Synchronous Generator ◽  
Synchronous Motor ◽  
Self Monitoring ◽  
Proposed Regulation ◽  
Digital Excitation ◽  
Regulation Model ◽  
Self Protection ◽  
Excitation Regulator

This paper introduces the research on the Excitation Regulator of the Synchronous Generator with dual CPUs, based on Digital Signal Processor (TMS320LF2812). With the multiple functions of monitoring, analysis, controlling and protection, it overcomes the shortage of the domestic excitation device in terms of self-monitoring and self-protection,which effectively improves device reliability. By analyzing the allocation of reactive load of the interconnected Synchronous Motor group, the model of the digital excitation regulator by Simulink of MATLAB is produced. The results of the simulation show that the proposed regulation model are feasible, satisfying various running demands of the Synchronous Motor and Power System.

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