scholarly journals Precision active power measuring channel

2021 ◽  
pp. 28-33
Author(s):  
Dmytro Ornatskyi ◽  
Sergey Yehorov ◽  
Maria Kataieva ◽  
Maryna Graf ◽  
Dmytro Shcherbyna
Keyword(s):  
Working Conditions ◽  
Phase Error ◽  
Measuring Channel ◽  
Active Power ◽  
Metrological Characteristics ◽  
Main Attention ◽  
Measuring Systems ◽  
Destabilizing Factors ◽  
Phase Interference ◽  
Simulation Results

The article is devoted to increasing the reliability, noise protection and improving the metrological characteristics of active power measuring converters. Much attention is paid to the problem of developing effective methods for constructing structural diagrams of active power measuring converters. This is explained by the growing requirements for the basic metrological characteristics of active power measuring converters as elements of information – measuring systems. The main attention in the work is paid to the development of ways to correct the influence of destabilizing factors in working conditions. The undoubted advantage of the work is a thorough analysis of the instrumental errors of the measuring channel, the original means of correction of the phase error and the error due to the limited suppression coefficients of in-phase interference. The obtained simulation results in the Electronics Workbench environment made it possible to determine the most effective way to protect against interference.

scholarly journals A Control Strategy for Smooth Power Tracking of a Grid-Connected Virtual Synchronous Generator Based on Linear Active Disturbance Rejection Control

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 3024 ◽  
Author(s):  
Yaya Zhang ◽  
Jianzhong Zhu ◽  
Xueyu Dong ◽  
Pinchao Zhao ◽  
Peng Ge ◽  
...  
Keyword(s):  
Disturbance Rejection ◽  
Synchronous Generator ◽  
Active Power ◽  
Energy Resources ◽  
Active Disturbance Rejection Control ◽  
Active Disturbance Rejection ◽  
Disturbance Rejection Control ◽  
New Energy ◽  
Simulation Results ◽  
Virtual Synchronous Generator

The power quality of new energy resources has received tremendous attention recently. The control approach for the inverter, an interface between the new energy resources, and the infinite bus system is of vital importance. For the virtual synchronous generator (VSG), one of the research hotspots in the inverter control field, there are some challenges remaining to be dealt with. First is the contradiction between the rapid response and overshoot of active power output if VSG is connected to the grid. Secondly, the active power is deeply influenced by the fluctuation of gird frequency and this may bring power oscillation to VSG in weak grids. In this article, an active power controller for power tracking of grid-connected VSG is designed based on linear active disturbance rejection control (LADRC) by compensating for the lumped disturbance in a feedforward fashion. The parameters of the controller are analyzed and tuned in the frequency domain to acquire a desirable control performance. Moreover, the robustness of the control system is also considered. Simulation results show that the designed control system can transmit active power to the grid in a timely manner with no overshoot, as demanded. Additionally, it can output active power steadily according to the power reference without using a phase-locked loop (PLL) when the grid frequency has different features of fluctuation. In addition, the simulation results demonstrate that the improved VSG has strong robustness to the model parameter perturbation and mismatch.

Study on operating modes of doubly fed induction generator with a short circuit fault on grid near the wind power plant

2021 ◽  
Vol 15 (1) ◽  
pp. 37-44
Author(s):  
Thai Hiep Le ◽  
◽  
Duong Hoang Phuc Tran
Keyword(s):  
Power Plant ◽  
Short Circuit ◽  
Active Power ◽  
Induction Generator ◽  
Wind Power Plant ◽  
Doubly Fed Induction Generator ◽  
Power Characteristic ◽  
Simulation Results ◽  
Doubly Fed ◽  
Short Circuit Fault

In this paper, the operating mode of a doubly fed induction generator (DFIG) wind turbine is studied in order to evaluate its fault ride-through and transient stability with a grid’s short circuit fault at near the wind power plant. Based on the structure of DFIG, external resistors are directly connected to rotor windings, then the generator operates as a wound rotor induction generator (WRIG) when there is a short circuit fault on the grid. According to the simulation results in Matlab, the active power is consumed on the crowbar resistor, causing the active power characteristic of generator is changed from high to low. As a result, the amount of excess mechanical energy is not much, so the generator be not accelerated significantly. These simulation results show that it is appropriate to use the crowbar resistor to change the power characteristic of the DFIG. Thanks to this change, the generator is still connected to the grid, stable operation both during and after a short circuit.

Compressive Strength Analysis of MWD Microchip Tracer

2014 ◽  
Vol 511-512 ◽  
pp. 561-564
Author(s):  
Ji Bo Li ◽  
Wei Ning Ni ◽  
San Guo Li ◽  
Zu Yang Zhu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Compressive Strength ◽  
Working Conditions ◽  
Failure Criterion ◽  
Strength Analysis ◽  
Design Phase ◽  
Key Issues ◽  
Simulation Results ◽  
Better Than

Pressure resistant performance of Measure While Drilling (MWD) microchip tracer to withstand the harsh downhole environment is one of the key issues of normal working. Therefore, it is an effective way to analyze pressure resistant performance of the tracer in the design phase. Compressive strength of the tracer was studied based on finite element method. Considering downhole complexity and working conditions during the processing of tracer roundness, material non-uniformity and other factors. In this study, researchers took sub-proportion failure criterion to determine the failure of tracer. Simulation results of two structures, with pin and without pin, show that both structures met the requirement of downhole compressive strength, and the structure with pin was better than the structure without pin. This study provides basis for downhole application of microchip tracers.

scholarly journals NCREASING IMMUNITY TO NOISE AND INDUSTRIAL INTERFERENCE OF HIGHLY SENSITIVE MEASURING CHANNELS OF THE SENSOR SYSTEMS

2021 ◽  
Vol 2021 (1) ◽  
pp. 73-83
Author(s):  
V.G. Melnyk ◽  
◽  
P.I. Borschov ◽  
V.K. Beliaev ◽  
O.D. Vasylenko ◽  
...  
Keyword(s):  
High Speed ◽  
Alternating Current ◽  
Measuring Channel ◽  
Measuring Systems ◽  
Basic Module ◽  
Highly Sensitive ◽  
Power Frequency ◽  
New Construction ◽  
Informative Signals ◽  
Electronic Channels

The article discusses the new construction principles of the highly sensitive and high-speed electronic channels for sensor measuring systems with parallel-sequential conversion of the dynamic informative signals of direct or alternating current in wide ranges of its amplitude and frequency. The possibilities of improving suppression of noise and the interferences on industrial power frequency with several methods of processing the obtained data shown analytically and experimentally. A prototype of a unified basic module of the measuring channel described, intended for the implementation of information-measuring systems for various purposes; its main characteristics are given. References 7, figures 14, table 1.

scholarly journals Prefabricated Urban Underground Utility Tunnels: A Case Study on Mechanical Behaviour with Strain Monitoring and Numerical Simulation

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yonggang Xiao ◽  
Jubing Zhang ◽  
Jie Cao ◽  
Changhong Li
Keyword(s):  
Numerical Simulation ◽  
Working Conditions ◽  
Failure Modes ◽  
Mechanical Performance ◽  
Low Cost ◽  
Side Wall ◽  
Operating Conditions ◽  
Land Occupation ◽  
Depth Analysis ◽  
Simulation Results

The prefabricated urban utility tunnels (UUTs) have many advantages such as short construction period, low cost, high quality, and small land occupation. However, there is still a lack of in-depth analysis of the mechanical performance of the prefabricated urban utility tunnel (UUT) structure with bolted connections under different working conditions. In this paper, the force performance of a prefabricated UUT in Tongzhou District, Beijing, was studied under different working conditions using two methods: field monitoring and numerical simulation. The multichannel strain monitor was used for monitoring, and the internal wall concrete and bolt strain change data under the two conditions of installation and backfill were obtained. Combined with the construction process of the UUTs, a three-dimensional numerical model was established by COMSOL, where the build-in bolt assembly was used to simulate the longitudinal connection of the tunnel. The simulation results were compared with the measured data to verify the rationality of the computational model. The simulation results showed that the concrete and bolts on the inner wall of the tunnel work well under the two conditions of installation and backfilling; The deformation of the top plate of the prefabricated tunnel was approximately parabolic, with the largest vertical displacement (0.37 mm) in the middle and the most sensitive to the vertical load in the central part of the roof. The central portion of the side wall had the largest displacement (0.17 mm) in the inner concave. The tensile stress of bolt 3 increased the most (30.75 MPa) but was still much smaller than the yield strength of the bolt. The concrete and bolts of the UUT were found to work well through force analysis under operating conditions. In conclusion, analysis of structural forces and deformation failure modes will help design engineers understand the basic mechanisms and select the appropriate UUT structure.

scholarly journals Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Fei Yao ◽  
Guangyu Chen ◽  
Jianhong Su
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Working Conditions ◽  
Acoustic Impedance ◽  
Shield Tunnel ◽  
Test Results ◽  
Impact Echo ◽  
Simulation Results ◽  
The Impact ◽  
Impact Echo Method

To identify shield grouting quality based on impact echo method, an impact echo test of segment-grouting (SG) test piece was carried out to explore effect of acoustic impedance of grouting layers and grouting defects on impact echo law. A finite element numerical simulation on the impact echo process was implemented. Test results and simulation results were compared. Results demonstrated that, under some working conditions, finite element simulation results and test results both agree with theoretical values. The acoustic impedance ratio of SG material influenced the echo characteristics significantly. But thickness frequency could not be detected under some working conditions because the reflected energy is weak. Frequency feature under grouting defects was more complicated than that under no grouting defects.

scholarly journals A Model of the On-State Voltage across IGBT Modules Based on Physical Structure and Conduction Mechanisms

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 851 ◽  
Author(s):  
Qingyi Kong ◽  
Mingxing Du ◽  
Ziwei Ouyang ◽  
Kexin Wei ◽  
William Hurley
Keyword(s):  
Working Conditions ◽  
Conduction Mechanism ◽  
Electrical Parameter ◽  
Physical Structure ◽  
Model Parameters ◽  
Insulated Gate Bipolar Transistor ◽  
Igbt Modules ◽  
Igbt Module ◽  
Detailed Method ◽  
Simulation Results

The on-state voltage is an important electrical parameter of insulated gate bipolar transistor (IGBT) modules. Due to limits in instrumentation and methods, it is difficult to ensure accurate measurements of the on-state voltage in practical working conditions. Based on the physical structure and conduction mechanism of the IGBT module, this paper models the on-state voltage and gives a detailed method for extracting the on-state voltage. Experiments not only demonstrate the feasibility of the on-state voltage separation method but also suggest a method for measuring and extracting the model parameters. Furthermore, on-state voltage measurements and simulation results certified the accuracy of this method.

scholarly journals Modified Modeling and System Stabilization of Shunt Active Power Filter Compensating Loads with μF Capacitance

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2084 ◽  
Author(s):  
Yuqi Bing ◽  
Daozhuo Jiang ◽  
Yiqiao Liang ◽  
Chongxi Jiang ◽  
Tianxiang He ◽  
...  
Keyword(s):  
Working Conditions ◽  
Simulation Analysis ◽  
Active Power Filter ◽  
Active Power ◽  
System Model ◽  
Conventional Model ◽  
Shunt Active Power Filter ◽  
Stability Problems ◽  
Power Filter ◽  
Hybrid Controller

The interactions between shunt active power filter (APF) and capacitance load tend to result in stability problems and resonance. The conventional model of a shunt APF is not precise enough to reflect this phenomenon. To address it, this paper proposes a modified shunt APF system model to accurately reflect various stability problems. This paper also studies the mechanism of positive feedback resonance brought by capacitance load and proposes a modified hybrid controller to improve the stable margin of the system, making the shunt APF work stably under different working conditions where there are μF capacitors on the demand side. The correctness and validity of the proposed strategy are verified by simulation analysis and prototype experiments.

Research of Amplification Frame Optimization Based on Optistruct

2012 ◽  
Vol 510 ◽  
pp. 541-544
Author(s):  
Bing Zhong
Keyword(s):  
Stress Distribution ◽  
Structural Optimization ◽  
Working Conditions ◽  
Simulation Software ◽  
Dynamics Simulation ◽  
Body Dynamics ◽  
Utilization Ratio ◽  
Simulation Results ◽  
The Cost ◽  
Multi Body

The motion of amplification frame of dumper was simulated by multi-body dynamics simulation software ADAMS, and the danger working conditions of amplification frame were calculated. The stress of amplification frame was simulated and analyzed by Optistruct software. The results show that the stress distribution in amplification frame is not uniform and it is big in the middle and small in the edge zeros. The structure of amplification is optimized according to the simulation results. The utilization ratio of the material increases and the cost of production decreases after structural optimization.

An Optimum UPQC with Minimum VA Requirement and Mitigation of Unbalanced Voltage Sag

2005 ◽  
Vol 2 (2) ◽  
Author(s):  
Y. Y. Kolhatkar ◽  
S. P. Das
Keyword(s):  
Active Power ◽  
Voltage Sag ◽  
Dynamic Voltage Restorer ◽  
Active Power Filters ◽  
Power Filters ◽  
Voltage Restorer ◽  
Unbalanced Voltage ◽  
Dynamic Voltage ◽  
Simulation Results ◽  
Power Quality Conditioner

The paper deals with an optimized Unified Power Quality Conditioner (UPQC), which aims at the integration of series active and shunt active power filters with minimum VA loading of the UPQC. The series active filter is a Dynamic Voltage Restorer (DVR), which is operated in twofold functioning mode. During the unbalanced voltage sag, the DVR compensates the unbalance in the voltage sag. It also regulates the voltage at the load end with minimum VA loading of the overall UPQC by optimum angle voltage injection. Validity of the proposed scheme is proved through extensive simulation results.

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