scholarly journals Control Strategy of Photovoltaic Grid Connected System Based on PI and QPR Double Closed Loop Control

2021 ◽  
Vol 2136 (1) ◽  
pp. 012017
Author(s):  
Shengqing Li ◽  
Na Deng ◽  
Jian Zheng ◽  
Jiaxing Yu
Keyword(s):  
Control Strategy ◽  
Closed Loop ◽  
System Stability ◽  
Closed Loop Control ◽  
Static Error ◽  
Loop Control ◽  
Phase Inverter ◽  
Suppression Effect ◽  
Three Phase ◽  
Three Phase Inverter

Abstract The traditional proportional integral (PI) controller in photovoltaic three-phase inverter system has the problems of no static error tracking and poor resonance suppression effect. In order to improve the resonance suppression effect and current control effect of photovoltaic three-phase inverter system, a control strategy of photovoltaic three-phase inverter system based on PI and quasi proportional resonance (QPR) double closed-loop control is proposed. The control strategy and control block diagram based on PI and QPR double closed-loop control are designed to realize no static error tracking of incoming current, which has better waveform of incoming current and resonance suppression effect, and improves system stability. Finally, the effectiveness of the control strategy are verified by simulation.

Research on High Precision and Stability of Three-Phase Rectifier Based on Fractional PIλ Order Controller

2011 ◽  
Vol 130-134 ◽  
pp. 2489-2494
Author(s):  
Fei Yu ◽  
Yi Ming Zhang
Keyword(s):  
Fractional Order ◽  
Control Strategy ◽  
Closed Loop ◽  
Pso Algorithm ◽  
Closed Loop Control ◽  
Loop Control ◽  
Three Phase ◽  
The Stability ◽  
Fractional Order Controller ◽  
Deep Exploration

According to the demand of transmitter for deep exploration, this paper presents a strategy of current double closed loop control based on fractional order controller, which used to improve the tracing performance and anti-interference capability of the current regulating loop, also the stability of load current. And also presents a modified GA-PSO algorithm to get the parameters of fractional order controller. Results show that modified GA-PSO algorithm has faster convergence speed and higher accuracy, new control strategy using in three-phase PWM voltage rectifier has remarkably improved the stability and anti-interference capability of system.

A Novel Control Strategy Based on Virtual dc Voltage Feedback for an Improved Three-Phase to Single-Phase Matrix Converter

2013 ◽  
Vol 291-294 ◽  
pp. 2452-2458
Author(s):  
Wen Bin Zhang ◽  
Hong Juan Ge
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Loop Control ◽  
Decoupling Method ◽  
Dc Voltage ◽  
Three Phase ◽  
Power Decoupling ◽  
Voltage Feedback

This paper presents an improved topology for three-phase to single-phase matrix converter (3-1 MC), and discusses the power decoupling method, closed-loop control strategy, etc. These studies make the single-output MC have good features, such as sinusoidal input current, low total harmonic distortion (THD), compensating the shortcomings of traditional 3-1 MC caused by the output power pulsation. According to the improved scheme, a novel closed-loop control strategy based on virtual dc voltage feedback is proposed. The strategy completes the closed-loop control of 3-1 MC by taking the virtual dc voltage as outer-loop controlled variable and the input current as inner-loop controlled variable. Consequently, the power factor correction (PFC) of 3-1 MC is achieved, and the control stability is improved. Finally, a series of stimulation and experiments for a prototype with 115V/400Hz output are conducted, the results show that the power decoupling method and control strategy are practically correct and feasible.

A Control Strategy for Intelligent Stamp Forming Tooling

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
William J. Emblom ◽  
Klaus J. Weinmann
Keyword(s):  
Fuzzy Logic ◽  
Control Systems ◽  
Control Strategy ◽  
Pid Controller ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Linear Quadratic ◽  
Blank Holder ◽  
Loop Control ◽  
Stamp Forming

This paper describes the development and implementation of closed-loop control for oval stamp forming tooling using MATLAB®’s SIMULINK® and the dSPACE®CONTROLDESK®. A traditional PID controller was used for the blank holder pressure and an advanced controller utilizing fuzzy logic combining a linear quadratic gauss controller and a bang–bang controller was used to control draw bead position. The draw beads were used to control local forces near the draw beads. The blank holder pressures were used to control both wrinkling and local forces during forming. It was shown that a complex, advanced controller could be modeled using MATLAB’s SIMULINK and implemented in DSPACE CONTROLDESK. The resulting control systems for blank holder pressures and draw beads were used to control simultaneously local punch forces and wrinkling during the forming operation thereby resulting in a complex control strategy that could be used to improve the robustness of the stamp forming processes.

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