scholarly journals Safety of single-channel control systems implemented in reversible logic

2018 ◽  
Vol 19 (12) ◽  
pp. 608-610
Author(s):  
Roman Pniewski ◽  
Michał Dobrzański
Keyword(s):  
Control Systems ◽  
Single Channel ◽  
Control Method ◽  
Fault Tolerant ◽  
Dynamic Change ◽  
Reversible Logic ◽  
Digital Systems ◽  
Correct Operation ◽  
Control Signals ◽  
Channel Control

The article discusses the method of controlling the correct operation of a control system using reversible gates developed by the authors. Reversible logic allows you to build fault-tolerant digital systems. The authors proposed an improved control method with a dynamic change of control signals, which can significantly improve safety.

scholarly journals Safety of Single-Channel Railway Traffic Control

2020 ◽  
Vol 64 (186) ◽  
pp. 125-131
Author(s):  
Roman Pniewski
Keyword(s):  
Control Systems ◽  
Traffic Control ◽  
Single Channel ◽  
Fault Tolerant ◽  
Reversible Logic ◽  
Digital Systems ◽  
Safety Level ◽  
Digital Devices ◽  
Railway Traffic ◽  
Safe Control

Reversible gates enable the creation of fault tolerant digital devices. The application of these gates allows safe control systems to be realized. At present, control systems based on relays are being replaced by systems based on computer technology. This technology allows the implementation of safe systems. Because this system is composed of many elements, it is very difficult to obtain a high safety level for it. The application of reversible logic in the synthesis of digital systems constitutes an alternative approach. The paper presents reversible gates along with examples of their usage in the synthesis of digital systems. The main advantage of reversible logic is the possibility of synthesis of self testing and fault tolerant circuits. The application of circuits based on reversible logic allows safe control systems to be developed. The paper also presents a proposal for the application of reversible logic in simple control systems. Keywords: reversible logic, railway traffic control, safety

Implementation of a single-channel active noise control system with multiple reference sensors

2020 ◽  
Vol 68 (5) ◽  
pp. 358-366
Author(s):  
H.E. Oh ◽  
W.B. Jeong ◽  
C. Hong
Keyword(s):  
Single Channel ◽  
Control Method ◽  
Reference Signal ◽  
Active Noise Control ◽  
Multiple Source ◽  
Weighted Sum ◽  
Reference Signals ◽  
Feedforward Controller ◽  
Channel Control ◽  
Source Signals

When multiple sources contribute competitively to the noise level, multi-channel control architecture is needed, leading to more cost and time for control computation. We, hence, are concerned with a single-channel control method with a single-reference signal obtained from a linear combination of the multiple source signals. First, we selected 3 source signal sensors for the reference signals and the error sensor, selected a proper actuator and designed the controllers: 3 cases of single-channel feedforward controllers with a single-reference signal respectively from the source signals, a multi-channel feedforward controller with the reference signals from the source signals, and the proposed controller with the reference signal from weighted sum of the source signals. The weighting factors and the filter coefficients of the controller were determined by the FxLMS algorithm. An experiment was then performed to confirm the effectiveness of the proposed method comparing the control performance with other methods for a tower air conditioner. The overall sound pressure level (SPL) detected by the error sensor is compared to evaluate their performance. The reduction in the overall SPL was obtained by 4.74 dB, 1.96 dB and 6.62 dB, respectively, when using each of the 3 reference signals. Also, the overall SPL was reduced by 7.12 dB when using the multi-reference controller and by 7.66 dB when using the proposed controller. Conclusively, under the multiple source contribution, a single-channel feed forward controller with the reference signal from a weighted sum of the source signals works well with lower cost than multi-channel feedforward controller.

scholarly journals Control of a Fault-Tolerant Photovoltaic Energy Converter in Island Operation

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3201
Author(s):  
Marino Coppola ◽  
Pierluigi Guerriero ◽  
Adolfo Dannier ◽  
Santolo Daliento ◽  
Davide Lauria ◽  
...  
Keyword(s):  
Control System ◽  
Control Method ◽  
Fault Tolerant ◽  
Storage System ◽  
Energy Resource ◽  
Energy Storage System ◽  
Correct Operation ◽  
Battery Packs ◽  
Battery Energy ◽  
The Hilbert Transform

The paper deals with design and control of a fault tolerant and reconfigurable photovoltaic converter integrating a Battery Energy Storage System as a standby backup energy resource. When a failure occurs, an appropriate control method makes the energy conversion system capable of operating in open-delta configuration in parallel with the grid as well as in islanded mode. In case network voltage is lacking due to heavy anomalies or maintenance reasons, the proposed control system is able to quickly disconnect the inverter from the grid while ensuring the energy continuity to the local load and the emergency fixtures by means of the integrated battery packs. In particular, the paper proposes a fast islanding detection method essential for the correct operation of the control system. This specific technique is based on the Hilbert transform of the voltage of the point of common coupling, and it identifies the utility lack in a period of time equal to half a grid cycle in the best case (i.e., 10 ms), thus resulting in good speed performance fully meeting the standard requirements. A thorough numerical investigation is carried out with reference to a representative case study in order to demonstrate the feasibility and the effectiveness of the proposed control strategy.

scholarly journals Digital control systems for power supplies of space vehicles

2018 ◽  
Vol 158 ◽  
pp. 01030
Author(s):  
Andrey Soldatov ◽  
Juriy Shinyakov ◽  
Maxim Sukhorukov
Keyword(s):  
Control Systems ◽  
Digital Control ◽  
Output Voltage ◽  
Fault Tolerant ◽  
Control Unit ◽  
Power Supplies ◽  
Space Vehicles ◽  
Theoretical Studies ◽  
Digital Control Systems ◽  
Channel Control

The principle of building fault-tolerant digital control systems for power supplies of space vehicles is considered in the article. The analysis of the circuits by sampling the controlled component of the output voltage at discrete instants of time is carried out. The possibility of using this approach in multi-channel digital control systems is shown. The results of theoretical studies are confirmed by the example of a four-channel control unit.

Single Channel Control Simulation Used on Servo Control

2014 ◽  
Vol 1028 ◽  
pp. 191-194
Author(s):  
Hong Cheng Zhou ◽  
Cun Bao Chen
Keyword(s):  
Single Channel ◽  
Control Method ◽  
Servo Control ◽  
Control Law ◽  
Tracking Loop ◽  
Low Velocity ◽  
Channel Control ◽  
Classical Control ◽  
And Control ◽  
Velocity Tracking

Based on analysis for characteristic of the motion configuration, the control strategy and control law used on the motion control system are presented. The controller in velocity tracking loop and location loop are respectively designed by frequency correcting method and normal control method which belongs to classical control theory. The problem of location control loop low velocity creeping is solved. A simulating experimentation demonstrates the effectiveness of the proposed approach.

A Carrier-Based Fault-Tolerant Control Method for Three-Level Neutral-Point-Clamped Inverter

2020 ◽  
Author(s):  
Zhan Gao ◽  
YaoHua Li ◽  
QiongXuan Ge ◽  
Lu Zhao ◽  
Ke Wang ◽  
...  
Keyword(s):  
Control Method ◽  
Fault Tolerant ◽  
Fault Tolerant Control ◽  
Neutral Point

A fault tolerant control method of EPS based on novel fault diagnosis

2015 ◽  
Author(s):  
S.L. Feng ◽  
H.X. Liu ◽  
X. Wang ◽  
F. Xiao ◽  
G.L. Wang
Keyword(s):  
Fault Diagnosis ◽  
Control Method ◽  
Fault Tolerant ◽  
Fault Tolerant Control

A fault-tolerant software strategy for digital systems

1984 ◽  
Author(s):  
E. HITT ◽  
J. WEBB
Keyword(s):  
Fault Tolerant ◽  
Digital Systems ◽  
Software Strategy

scholarly journals Output-feedback ℋ2/ℋ∞ control of a class of networked fault tolerant control systems

2008 ◽  
Vol 10 (1) ◽  
pp. 34-44 ◽  
Author(s):  
S. Aberkane ◽  
J. C. Ponsart ◽  
D. Sauter
Keyword(s):  
Control Systems ◽  
Output Feedback ◽  
Fault Tolerant ◽  
Fault Tolerant Control

scholarly journals Internal Leakage Fault Detection and Tolerant Control of Single-Rod Hydraulic Actuators

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Jianyong Yao ◽  
Guichao Yang ◽  
Dawei Ma
Keyword(s):  
Fault Detection ◽  
Simple Structure ◽  
Control Method ◽  
Fault Tolerant ◽  
Parameter Adaptation ◽  
Servo Systems ◽  
Hydraulic Actuators ◽  
Quadratic Lyapunov Functions ◽  
Safety And Reliability ◽  
Hydraulic Servo

The integration of internal leakage fault detection and tolerant control for single-rod hydraulic actuators is present in this paper. Fault detection is a potential technique to provide efficient condition monitoring and/or preventive maintenance, and fault tolerant control is a critical method to improve the safety and reliability of hydraulic servo systems. Based on quadratic Lyapunov functions, a performance-oriented fault detection method is proposed, which has a simple structure and is prone to implement in practice. The main feature is that, when a prescribed performance index is satisfied (even a slight fault has occurred), there is no fault alarmed; otherwise (i.e., a severe fault has occurred), the fault is detected and then a fault tolerant controller is activated. The proposed tolerant controller, which is based on the parameter adaptive methodology, is also prone to realize, and the learning mechanism is simple since only the internal leakage is considered in parameter adaptation and thus the persistent exciting (PE) condition is easily satisfied. After the activation of the fault tolerant controller, the control performance is gradually recovered. Simulation results on a hydraulic servo system with both abrupt and incipient internal leakage fault demonstrate the effectiveness of the proposed fault detection and tolerant control method.

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