scholarly journals A Novel Digital Control Method of a Single-Phase Grid-Connected Inverter Based on a Virtual Closed-Loop Circuit and Complex Vector Representation

Energies ◽  
2017 ◽  
Vol 10 (12) ◽  
pp. 2068 ◽  
Author(s):  
Kun Xie ◽  
Gangyi Hu ◽  
Hong Yi ◽  
Zhibi Lyu ◽  
Yangxiao Xiang
Keyword(s):  
Digital Control ◽  
Single Phase ◽  
Closed Loop ◽  
Control Method ◽  
Vector Representation ◽  
Complex Vector ◽  
Grid Connected Inverter

scholarly journals A Control Strategy of a Single-phase H6-type Grid-connected Inverter with Low Harmonic Current

2018 ◽  
Vol 173 ◽  
pp. 02041
Author(s):  
Lin Chunxu ◽  
Zhou Chunhua ◽  
Li Wei ◽  
Chen Rui
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Closed Loop ◽  
High Efficiency ◽  
Control Method ◽  
Harmonic Distortion ◽  
Outer Loop ◽  
Lcl Filter ◽  
Loop Control ◽  
Grid Connected Inverter

In order to reduce the total harmonic distortion (THD) of the grid-connected current caused by the high-frequency switching of the inverter, this paper combines the high efficiency single-phase H6-type inverter with LCL filter. The double closed-loop control method that consists of grid-connected current outer loop and capacitor current inner loop is put forward, by which a resonance peak of a low damping LCL filter is eliminated. In the grid-connected current outer loop, quasi proportion resonant (QPR) controller is adopted to overcome the steady-state error and weak anti-jamming capability in traditional PI controller. Finally, a simulation model is built in SIMULINK to verify the research. The simulation results show that, based on the single-phase H6-type inverter and LCL filter, the double closed-loop QPR control strategy can achieve the static error free tracking control of grid-connected current, which makes the system more stable and reduces the THD of grid-connected current effectively.

The Effect of Digital Process of Single-Phase Photovoltaic Grid Connected Inverter

2014 ◽  
Vol 1070-1072 ◽  
pp. 60-63
Author(s):  
Hong Tao Shan ◽  
Bin Zhou
Keyword(s):  
Digital Control ◽  
Single Phase ◽  
Zero Order ◽  
System Stability ◽  
Stability Range ◽  
Delay Control ◽  
One Step ◽  
Grid Connected Inverter ◽  
The Stability ◽  
Sample Time

Digital control possesses evident advantages and has become a mainstream control of photovoltaic grid connected inverter.The mathematical model and parameter setting of the single phase photovoltaic grid connected inverter with L filter was introduced in the paper.It was analysed on the effect on system stability of digital process from the two aspects which were the zero-order-hold and one-step-delay control. The bode diagram was verified the theoretical analysis on system stability.The conclusions were made that the introduction of digital control reduces the critical stable gain of photovoltaic grid connected inverter system,system stability is varied with sample time, the parameters of L can affect the system stability range,zero-order-hold reduces the stability range and limits the performance improved of digital control system,one-step-delay control on photovoltaic grid connected inverter reduces again the stability range on the basis of the zero-order-hold control.

scholarly journals A Novel Double Closed-loop Control Method for Single-phase PWM Rectifier

2020 ◽  
Vol 53 (5) ◽  
pp. 518-523
Author(s):  
Wang Zeting ◽  
Zhu Guiqing ◽  
Zhang Hu
Keyword(s):  
Single Phase ◽  
Closed Loop ◽  
Control Method ◽  
Closed Loop Control ◽  
Pwm Rectifier ◽  
Loop Control

Optimized Pulse Modulation: A Novel Idea of a Digital Control Method for On/Off Valves

2011 ◽  
Author(s):  
Ingo Schepers ◽  
Daniel Weiler ◽  
Juergen Weber
Keyword(s):  
Digital Control ◽  
Closed Loop ◽  
Control Method ◽  
Closed Loop Control ◽  
The Novel ◽  
Control Methods ◽  
Pulse Control ◽  
Pulse Modulation ◽  
Loop Control ◽  
The Common

This article describes how on/off valves can be used in the closed loop control. After studying different industrial hydraulic applications typical requirements will be compiled. From these requirements a basic on/off valve architecture will be derived. In this article the number of parallel connected on/off valves per control edge is limited to one valve. So the typical digital hydraulics with a high number of parallel connected valves is not considered. The on/off valves could not be controlled like normal directional valves. To control on/off valves digital control methods are common to use. The digital control methods are not optimized for the hydraulic on/off valves, because the origins of the digital control methods will be found in the electrical engineering. The novel idea for the digital control methods is the optimized pulse control which eliminates the disadvantages of the common digital control methods. How the optimized pulse control works is described in this article.

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