Simulation analysis of vibration-impact invalidation of low voltage apparatus part

2015 ◽  
pp. 199-201
Author(s):  
X Miao ◽  
Bing Zhang ◽  
Y Huang
Keyword(s):  
Low Voltage ◽  
Simulation Analysis ◽  
Vibration Impact ◽  
Apparatus Part

Modeling and Simulation of Oscillating Water Column Wave Energy Generator

2012 ◽  
Vol 610-613 ◽  
pp. 2525-2529
Author(s):  
Hong Zhan Nie ◽  
Ming Zhang ◽  
Hong Shen
Keyword(s):  
Mathematical Model ◽  
Water Column ◽  
Wave Energy ◽  
Low Voltage ◽  
Simulation Analysis ◽  
Oscillating Water Column ◽  
Synchronous Generators ◽  
Permanent Magnet Synchronous Generators ◽  
Point Tracking ◽  
Power Point

This paper focuses on the oscillating water column (OWC) wave energy generator. An overall mathematical model is established comprising of the wave energy capture, drive system, permanent magnet synchronous generators (PMSG), vector control, maximum power point tracking (MPPT), and low voltage ride through (LVRT) control. With this mathematical model, an OWC wave energy generator based on PMSG simulation model is set up in Matlab/Simulink environment. A simulation analysis of the model is carried out which is connected to the grid under the condition of wave changes and power system faults. The simulation facilitates the MPPT and the decoupling control of power for OWC wave energy generator. Results show that the system with back-to- back PWM converter operates in a satisfying way and the model established works correctly and effectively.

Research on D-PMSG Wind Power System with SDBR for LVRT

2013 ◽  
Vol 448-453 ◽  
pp. 1767-1772
Author(s):  
Xiong Feng He ◽  
Xian Yun Li ◽  
Tong Zhou Ji ◽  
Hao Peng ◽  
Kun Liu
Keyword(s):  
Power System ◽  
Wind Power ◽  
Low Voltage ◽  
Simulation Analysis ◽  
High Reliability ◽  
Low Cost ◽  
Synchronous Generator ◽  
Protection Scheme ◽  
Wind Power System ◽  
Grid Side

For enhancing low voltage ride though (LVRT) capability, this paper proposes a new protection scheme of series dynamic breaking resistor (SDBR) connected to the grid-side inverter (GSI) of directly driven permanent magnet synchronous generator (D-PMSG) wind power system, which has a lot of advantages such as possessing low cost, simple structure and high reliability. The structure, switching control strategy and matched resistance of SDBR are researched. The proposed scheme was then applied to uplift GSI voltage during a fault, maintain active power delivered to grid, inhibit DC-link overvoltage and GSI overcurrent. The simulation analysis shows that the SDBR can substantially improve the LVRT capacity of D-PMSG wind power system in PSCAD/EMTDC.

The Material of the Resonant Vibration Impact Motivates the Influence of and the Simulation Analysis

2012 ◽  
Vol 510 ◽  
pp. 261-265
Author(s):  
Qiang Liu
Keyword(s):  
Response Curve ◽  
Simulation Analysis ◽  
Resonant Vibration ◽  
Test Bed ◽  
Geological Time ◽  
Geological Body ◽  
Balance System ◽  
Zoom Factor ◽  
Vibration Impact ◽  
The Impact

This paper to the resonant vibration conveying material on the effect of the shock of geologic detailed analysis to research, perfect the resonant vibration against the motive of the dynamic model. Application of the method of harmonic balance system dynamics equation of solution, and draw the conclusion that, under geological body dynamics of the zoom factor amplitude frequency response curve. A test bed to the actual parameters is simulated, on the test, the displacement of the geological time response curve. The results show that: consider material impact and without considering the impact of material, compared the antiresonant frequency decreases, and in the near antiresonance point, the amplitude becomes big bodies.

Research of Communication of Low Voltage Feed Switch Based on Power Line Carry

2014 ◽  
Vol 1046 ◽  
pp. 323-326
Author(s):  
Da Wei Wang
Keyword(s):  
Low Voltage ◽  
Simulation Analysis ◽  
Power Line ◽  
Matlab Simulation ◽  
Analysis Methods ◽  
Key Technologies ◽  
Communication Module

The development of power line carry technology provides a new possibility way of reform for low-voltage feed switch. We want to find the realization methods and the key technologies of the communication module in the mine use low voltage flameproof feed switch. It also offering solutions in view of the possible interference, and partly using MATLAB simulation analysis methods to validate. Methods of this paper provide a guideline for the design of communication module in the mine use separated explosion low voltage switch.

scholarly journals Simulation and Experimental Research on Overvoltage Measurement of Hybrid CVT

2021 ◽  
Vol 256 ◽  
pp. 01016
Author(s):  
Yu Nie ◽  
Guoqing Zhang ◽  
Jiakuo Song ◽  
Guizhong Wang
Keyword(s):  
Low Voltage ◽  
Simulation Analysis ◽  
Test Results ◽  
Transient Model ◽  
Medium Voltage ◽  
Analysis Process ◽  
Voltage Division ◽  
In Series ◽  
Power Frequency ◽  
Transient Overvoltage

The CVT equipment running on site is slightly modified to form a hybrid CVT to achieve transient overvoltage measurement, which is theoretically feasible and practical. In order to study the voltage division method based on the hybrid CVT to measure the overvoltage of the power system, that is, the low voltage capacitor C3 is connected in series between the low voltage terminal of the medium voltage capacitor C2 of the traditional CVT and the ground, and the transient overvoltage measurement is realized through C3. This article uses ATP-EMTP to establish its high-frequency transient model for simulation analysis. For further verification, a power frequency voltage test and an impulse voltage test were carried out on the 110kV hybrid CVT produced by Taikai Transformer Factory, focusing on the analysis of the partial voltage characteristics of the capacitor C3. The simulation results show that the C3 partial pressure method can achieve a relatively accurate measurement of the transient overvoltage. The test results show that the voltage across C3 is affected by uncertain factors and has an impact phenomenon. The above analysis process and results have certain practical value for designing actual products.

scholarly journals Prediction and Simulation Analysis of Current Turn-off Behavior of Low-Voltage DC Circuit Breaker

2021 ◽  
Vol 2005 (1) ◽  
pp. 012136
Author(s):  
Yuebin Wu ◽  
Lei Hou ◽  
Tianxing Qi ◽  
Tao Ma ◽  
Yuhui Kong ◽  
...  
Keyword(s):  
Low Voltage ◽  
Simulation Analysis ◽  
Circuit Breaker ◽  
Dc Circuit Breaker ◽  
Prediction And Simulation

scholarly journals A Low-Voltage, Ultra-Low-Power, High-Gain Operational Amplifier Design for Portable Wearable Devices

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 74
Author(s):  
Na Bai ◽  
Xiaolong Li ◽  
Yaohua Xu
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Operational Amplifier ◽  
Low Voltage ◽  
Simulation Analysis ◽  
Supply Voltage ◽  
High Gain ◽  
Common Mode ◽  
Ultra Low Power ◽  
The Common

Based on the SMIC 0.13 um CMOS technology, this paper uses a 0.8 V supply voltage to design a low-voltage, ultra-low-power, high-gain, two-stage, fully differential operational amplifier. Through the simulation analysis, when the supply voltage is 0.8 V, the design circuit meets the ultra-low power consumption and also has the characteristic of high gain. The five-tube, fully differential, and common-source amplifier circuits provide the operational amplifier with high gain and large swing. Unlike the traditional common-mode feedback, this paper uses the output of the common-mode feedback as the bias voltage of the five-tube operational transconductance amplifier load, which reduces the design cost of the circuit; the structure involves self-cascoding composite MOS, which makes the common-mode feedback loop more sensitive. The frequency compensation circuit adopts Miller compensation technology with zero-pole separation, which increases the stability of the circuit. The input of the circuit uses the current mirror. A small reference current is chosen to reduce power consumption. A detailed performance simulation analysis of this operational amplifier circuit is carried out on the Cadence spectre platform. The open-loop gain of this operational amplifier is 74.1 dB, the phase margin is 61°, the output swing is 0.7 V, the common-mode rejection ratio is 109 dB, and the static power consumption is only 11.2 uW.

scholarly journals A Novel Power Sharing Strategy Based on Virtual Flux Droop and Model Predictive Control for Islanded Low-Voltage AC Microgrids

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4893
Author(s):  
Saheb Khanabdal ◽  
Mahdi Banejad ◽  
Frede Blaabjerg ◽  
Nasser Hosseinzadeh
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Control Strategy ◽  
Low Voltage ◽  
Simulation Analysis ◽  
Power Sharing ◽  
Droop Control ◽  
Software Environment ◽  
Microgrid Control ◽  
Virtual Flux

The droop control scheme based on Q − ⍵ and P − V characteristics is conventionally employed to share the load power among sources in an islanded low-voltage microgrid with resistive line impedances. However, it suffers from poor active power sharing, and is vulnerable to sustained deviations in frequency and voltage. Therefore, accurate power sharing and maintaining the frequency and voltage in the desired ranges are challenging. This paper proposes a novel microgrid control strategy to address these issues. The proposed strategy consists of a virtual flux droop and a model predictive control, in which the virtual flux is the time integral of the voltage. Firstly, the novel virtual flux droop control is proposed to accurately control the power sharing among DGs. Then, the model predictive flux control is employed to generate the appropriate switching signals. The proposed strategy is simple without needing multiple feedback control loops. In addition, pulse width modulation is not required and tuning challenges for PI regulators are avoided. In order to evaluate the effectiveness of the proposed microgrid control strategy, simulation analysis is carried out in Matlab/Simulink software environment. The results show that accurate power sharing is achieved while a good dynamic response is provided. Furthermore, the voltage and frequency deviations are significantly improved.

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