scholarly journals Modeling and Parameter Design of Voltage-Controlled Inverters Based on Discrete Control

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2154 ◽  
Author(s):  
Ningbo Dong ◽  
Huan Yang ◽  
Junfei Han ◽  
Rongxiang Zhao
Keyword(s):  
Design Method ◽  
Dynamic Performance ◽  
Resonance Peak ◽  
Design Flow ◽  
Discrete Control ◽  
Current Loop ◽  
Current Controller ◽  
Voltage Controller ◽  
The Stability ◽  
The Mathematical Model

Grid-connected inverters are widely used to interface renewable energy and energy storage resources into the grid. Voltage-controlled inverters have attracted more and more attention due to their grid-friendly characteristics. The mathematical models of the voltage and current loops are developed in this paper, considering especially the discrete control delay caused by calculation and modulation. In order to suppress the resonance peak in the current loop, the frequency characteristics of the current loop are analyzed in detail. The optimum design flow of the current controller and voltage controller parameters are presented based on numerical analysis, and the stability, dynamic performance and the resonance peak suppression in voltage loop are also considered. Finally, the validity of the mathematical model and the effectiveness of the controller parameters design method are verified by simulation and experimental results.

scholarly journals Decoupled Current Controller Based on Reduced Order Generalized Integrator for Three-Phase Grid-Connected VSCs in Distributed System

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2426 ◽  
Author(s):  
Sen Zhang ◽  
Jianfeng Zhao ◽  
Zhihong Zhao ◽  
Kangli Liu ◽  
Pengyu Wang ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Design Method ◽  
Reference Signal ◽  
Response Speed ◽  
Critical Issue ◽  
Voltage Source ◽  
Current Loop ◽  
Reduced Order ◽  
Distributed Power Generation ◽  
Current Controller

Grid-connected voltage source converters (GC-VSCs) are used for interfacing the distributed power generation system (DPGS) to the utility grid. Performance of the current loop is a critical issue for these GC-VSCs. Recently, reduced order generalized integrator (ROGI)-based current controller is proposed, such that AC reference signal of positive or negative sequences can be separately tracked without steady-state error, which has the advantage of less computational burden. However, the cross-coupling within the ROGI-based current controller would deteriorate the transient response of the current loop. In this paper, a ROGI-based decoupled current controller is proposed to eliminate the coupling between α -axis and β -axis. Thus, the faster dynamic response performance can be achieved while maintaining the merits of ROGI-based current controller. An optimal gain parameter design method for the proposed current controller is presented to improve the stability and dynamic response speed of current loop. Simulation and experiments were performed in MATLAB/Simulink and TMS320C28346 DSP-based laboratory prototype respectively, which validated the proposed theoretical approach.

Multiobjective Robust Regulating and Protecting Control for Aeroengines

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
Daren Yu ◽  
Xiaofeng Liu ◽  
Wen Bao ◽  
Zhiqiang Xu
Keyword(s):  
Control Method ◽  
Design Method ◽  
Dynamic Performance ◽  
Switching Control ◽  
Linear Matrix ◽  
Matrix Inequality ◽  
Proportional Integral Derivative ◽  
Engine Control System ◽  
Switching Performance ◽  
The Stability

The multiobjective regulating and protecting control method presented here will enable improved control of multiloop switching control of an aeroengine. The approach is based on switching control theory, the switching performance objectives and the strategy are given, and a family of H∞ proportional-integral-derivative controllers was designed by using linear matrix inequality optimization algorithm. The simulation shows that using the switching control design method not only can improve the dynamic performance of the engine control system but also can guarantee the stability in some peculiar occasions.

An FPGA Implementation of the Robust Controller for the Active Magnetic Bearing System

2009 ◽  
Vol 147-149 ◽  
pp. 399-409
Author(s):  
Zbigniew Kulesza ◽  
Zdzisław Gosiewski
Keyword(s):  
Dynamic Properties ◽  
Dynamic Performance ◽  
Magnetic Bearing ◽  
Design Flow ◽  
Active Magnetic Bearing ◽  
Project Design ◽  
Robust Controller ◽  
Fpga Chip ◽  
The Stability ◽  
Bearing System

The article presents the project design flow that leads to the implementation of the robust controller law in the FPGA chip. The designed robust FPGA controller is going to be used in the heteropolar active magnetic bearing system. The hardware and software architectures of the designed controller are presented. The hardware consists of the market available Spartan-3 Development Board and two specially designed A/D and D/A converters boards. The software architecture is made of several VHDL entities that are translated into the target FPGA chip. The results of the experimental preliminary tests show that the dynamic properties of the designed controller are very good and the authors hope that the dynamic performance, especially the stability of the whole active magnetic bearing system, will improve.

Research on Double-Closed-Loop Control for the Frequency Converters in Parallel Operation

2013 ◽  
Vol 722 ◽  
pp. 503-506
Author(s):  
Hao Long ◽  
Xue Jun Li ◽  
Jing Long Huang ◽  
Kuan Fang He
Keyword(s):  
Closed Loop ◽  
Frequency Converter ◽  
Dynamic Performance ◽  
Response Speed ◽  
Current Loop ◽  
Parallel Operation ◽  
Loop Control ◽  
Frequency Converters ◽  
The Stability ◽  
Classical Control

In order to achieve the two drive synchronous operation , it's necessary to add an inner current loop on the basis of the outer voltage regulator which improve the system s dynamic response speed in the premise of ensure the stability of the system. The frequency converter parallel technology controlled by voltage and current double closed loop is researched. Design the controllers parameters of the current inner ring and voltage outer ring and these parameters are demonstrated according to the classical control theory. At last we conduct the simulation whose results show that the parallel converter system which controlled by the voltage and current double closed loop has good static and dynamic performance.

Simulation Technologies for Tamper System of Asphalt-Paver Based on AMESim

2010 ◽  
Vol 129-131 ◽  
pp. 1098-1103 ◽  
Author(s):  
Tian Hong Luo ◽  
Xin Fu Gan ◽  
Wen Jun Luo
Keyword(s):  
Mathematical Model ◽  
Simulation Model ◽  
Pid Controller ◽  
Dynamic Performance ◽  
Operating Principle ◽  
Simulation Results ◽  
The Stability ◽  
The Mathematical Model

Tamper mechanism is one of the most important parts in all of Asphalt-pavers. In this article, the mathematical model of the tamper system has been established and the stability of the system has been analyzed by using Matlab. According to the operating principle of tamper system of Asphalt-paver, the simulation model of tamper system of Asphalt-paver has been established by using AMESim. The main parameters of the model were set, and then, the simulation results were analyzed, which show that the system is stable and the dynamic performance of system will be improved, when accumulator and PID controller were equipped. Besides, the tamping frequency of hammer is very important to the performance of system. When tamping frequency of hammer over 20HZ, the performance of system will go bad.

scholarly journals A Control Parameters Design Method With Multi-Constrains for an LCL-Filtered Grid-Connected Inverter in a Weak Grid

2022 ◽  
Vol 9 ◽  
Author(s):  
Fuyun Wu ◽  
Zhuang Sun ◽  
Weiji Xu ◽  
Zhizhou Li ◽  
Jianguo Lyu
Keyword(s):  
Steady State ◽  
Design Method ◽  
Dynamic Performance ◽  
Active Damping ◽  
Parameter Design ◽  
Control Parameters ◽  
Weak Grid ◽  
Current Controller ◽  
Grid Impedance ◽  
Grid Connected Inverter

Under weak grid conditions, the variation of the grid impedance will affect the steady-state and dynamic performance of the LCL-filtered grid-connected inverter and even make the inverter unstable. To ensure the system stability and further improve the dynamic performance in a weak grid, a control parameter design method with multi-constrains considering the system bandwidth for the current controller and active damping is proposed in this paper. First, based on the current controller and active damping with only grid current feedback, the effects of control parameters and grid impedance on the LCL resonant suppression and the performance of the inverter are analyzed. Moreover, the parameter constraints of the controllers are derived considering the grid impedance, including stability, resonance suppression, and margin constraints. Furthermore, as the system bandwidth affects the dynamic performance of the inverter, combined with the obtained multi-constraints, the optimal control parameters are determined by achieving the maximum bandwidth of the system against the impedance variation. Compared with other two methods, when the proposed method is applied, the system can operate with a better dynamic and steady-state performance. Finally, experiments are performed on a 2 kW three-phase grid-connected inverter in the weak grid, which verify the effectiveness of the parameter design method proposed in this paper.

The Robust Design of Four-Bar Linkage with Clearance Based on Sensitivity Analysis

2010 ◽  
Vol 34-35 ◽  
pp. 1656-1660 ◽  
Author(s):  
Ying Cai Yuan ◽  
Yi Lun Liu ◽  
Yan Li
Keyword(s):  
Sensitivity Analysis ◽  
Mechanical System ◽  
Robust Design ◽  
Optimization Design ◽  
Design Method ◽  
Dynamic Performance ◽  
Nonlinear Dynamic Model ◽  
The Stability ◽  
And Control ◽  
Four Bar Linkage

Clearance is inevitable，so, with the increasing of machine’s speed, nonlinear vibration phenomenon caused by clearance is more apparent, which influences the precision and stability of mechanical system. For increasing the stability of mechanical system, a robust design method based on sensitivity analysis is studied, by using four-bar linkage as the research object, deducing the nonlinear dynamic model with clearance and the sensitivity of dynamic response, based on the rational planning to the tracks and control the sensitivities. In the design example, it shows that although the track deviation of robust design is slightly bigger than that of optimization design, the comprehensive dynamic performance of the mechanical system is much better than the latter, which means the stability of mechanical system is improved greatly. Thus, the robust design based on sensitivity analysis is an effective way to improve the stability of the mechanical system.

Visualized Analysis and Simulation Research on Dynamic Performance of the Whole NC Machine Tool

2010 ◽  
Vol 118-120 ◽  
pp. 815-819
Author(s):  
Bo Wang ◽  
Wei Sun ◽  
Yan Chen ◽  
Le Tang ◽  
Bang Chun Wen
Keyword(s):  
Machine Tool ◽  
Performance Optimization ◽  
Design Method ◽  
Dynamic Performance ◽  
Digital Design ◽  
Design Flow ◽  
Numerical Control ◽  
Visual Design ◽  
Simulation Research ◽  
Nc Machine

The dynamic performance of numerical control (NC) machine is not only basis of evaluation for the vibration resistance and stability, but also theory basis of optimizing dynamic performance, and improving processed quality. As digital design method, visual design realizes "visibility" during the whole design process, increases design efficiency and guarantees the quality, which make visual design preferred design method in large mechanical engineering. In this paper, the analysis of dynamic performance on NC machine and visual design method will be integrated, taking a NC machining center built by Shenyang machine tool group as a study case, the dynamic visual design flow to be proposed, including the design purpose, content and design methods, finally, the dynamic performance of visual simulation we have done, taking the strength, inherent characteristics and harmonic response into account, offers the foundation about structural performance optimization on the machine.

scholarly journals Harmonic Suppression Strategy of Photovoltaic Grid Connected Inverter Based on Repetitive and PI Control

2021 ◽  
Vol 2136 (1) ◽  
pp. 012032
Author(s):  
Shengqing Li ◽  
Wang Han ◽  
Xiaobao Li ◽  
Zhijian Wang
Keyword(s):  
Dynamic Performance ◽  
Pi Control ◽  
Harmonic Suppression ◽  
Current Feedback ◽  
Current Harmonics ◽  
Current Controller ◽  
Grid Connected Inverter ◽  
The Mathematical Model ◽  
Suppression Strategy ◽  
Harmonic Problem

Abstract To address the serious harmonic problem of grid connected current in photovoltaic grid-connected inverter, a harmonic suppression strategy based on Repetitive and PI control is proposed in this thesis. According to this strategy, the mathematical model of LCL photovoltaic grid-connected inverter is established with the harmonic mechanism analyzed, the repetitive and PI control is added into the current controller, and the capacitive-current feedback is added to enhance the system damping. Furthermore, it puts PI control on the inner loop and the repetitive control on the outer loop to improve the dynamic performance and achieve the harmonic suppression of the system. Moreover, the simulation results show that this method improves the dynamic response ability of the system, and effectively suppress the grid-connected current harmonics as THD of grid-connected current is 19.65% lower than that of PI controller.

Dynamic Performance of High-Speed Electric Multiple Unit within Multi-Body System Simulation

2019 ◽  
Vol 12 (4) ◽  
pp. 339-349
Author(s):  
Junguo Wang ◽  
Daoping Gong ◽  
Rui Sun ◽  
Yongxiang Zhao
Keyword(s):  
High Speed ◽  
Rapid Development ◽  
Dynamic Performance ◽  
Body System ◽  
High Speed Railway ◽  
Evaluation Indexes ◽  
Actual Operation ◽  
Multiple Unit ◽  
The Stability ◽  
Multi Body

Background: With the rapid development of the high-speed railway, the dynamic performance such as running stability and safety of the high-speed train is increasingly important. This paper focuses on the dynamic performance of high-speed Electric Multiple Unit (EMU), especially the dynamic characteristics of the bogie frame and car body. Various patents have been discussed in this article. Objective: To develop the Multi-Body System (MBS) model of EMU, verify whether the dynamic performance meets the actual operation requirements, and provide some useful information for dynamics and structural design of the proposed EMU. Methods: According to the technical characteristics of a typical EMU, a MBS model is established via SIMPACK, and the measured data of China high-speed railway is taken as the excitation of track random irregularity. To test the dynamic performance of the EMU, including the stability and safety, some evaluation indexes such as wheel-axle lateral forces, wheel-axle lateral vertical forces, derailment coefficients and wheel unloading rates are also calculated and analyzed in detail. Results: The MBS model of EMU has better dynamic performance especially curving performance, and some evaluation indexes of the stability and safety have also reached China’s high-speed railway standards. Conclusion: The effectiveness of the proposed MBS model is verified, and the dynamic performance of the MBS model can meet the design requirements of high-speed EMU.

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