scholarly journals Seamless Switching Control Technology for the Grid-Connected Converter in Micro-Grids

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2109
Author(s):  
Changli Shi ◽  
Tongzhen Wei ◽  
Yushu Sun ◽  
Dongqiang Jia ◽  
Tianchu Li
Keyword(s):  
Control Strategy ◽  
Power Supply ◽  
Current Source ◽  
Switching Control ◽  
Local Load ◽  
Voltage Source ◽  
Control Technology ◽  
Loop Control ◽  
Reliable Power Supply ◽  
Micro Grids

In order to ensure the reliable power supply of the local load in the micro-grid (MG), a seamless switching control technology (SSCT) suitable for grid-connected converter (GCC) is proposed. This technology includes silicon-controlled rectifiers (SCR) forced shutdown control strategy (SCR-FSCS) and three-loop control strategy (TLCS). The SCR-SSCT adjusts the load voltage in real time to form a back voltage at the grid-connected inductor, which greatly reduces the SCR shutdown time and ensures the reliability of local load power supply. The TLCS can easily realize the switching between the current source mode and the voltage source mode of the GCC. An experimental platform is established to carry out the relevant experiments. The experimental results show the rationality and effectiveness of the theoretical analysis and the proposed control technology.

Research on Energy Saving Directing at Building Lighting System

2012 ◽  
Vol 253-255 ◽  
pp. 679-683
Author(s):  
Jiang Hong Xie ◽  
Jin Ping Wang ◽  
Ming Xia Shang Guan ◽  
Yang Shao
Keyword(s):  
Energy Saving ◽  
Power Supply ◽  
Supply Voltage ◽  
Current Source ◽  
Source Model ◽  
Voltage Source ◽  
Lighting System ◽  
Work Processes ◽  
Power Supply Voltage ◽  
Optimal Power

The thesis states the building lighting regulated system composition, basic functions and work processes. Based on the compensation principle, making use of transformer controlled voltage source and the controlled current source model, the thesis analyzes the principle of the system voltage. According to the illumination and life span character of the lighting lamps and lanterns in different voltage, the thesis gets the optimal power supply of building lighting system electric lamps and lanterns. Finally, the building indoor lighting using optimal power supply voltage lighting and energy saving rate of building exterior wall using time-varying stabilized voltage control scheme are analyzed and calculated.

scholarly journals Research on Operating Characteristics of Two-Terminal Flexible Direct Transmission with Improved Deadbeat Control

2021 ◽  
Vol 256 ◽  
pp. 01043
Author(s):  
Mei Jianchun ◽  
Qian Junxia ◽  
Zhao Shengjie ◽  
Ma Hongjuan ◽  
Song Pengcheng ◽  
...  
Keyword(s):  
Control Strategy ◽  
Operation Mode ◽  
Electricity Consumption ◽  
Transmission System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Basic Operation ◽  
Deadbeat Control ◽  
Operating Characteristics ◽  
Loop Control

Traditional DC transmission technology has obvious defects in power adjustment speed, loss reduction, protection and control, etc., and it has been unable to meet the diverse needs of electricity consumption. The flexible DC transmission system not only solves the above shortcomings, but also has the advantages of independently controllable power and power supply to passive network. It is widely applied in distributed power generation by new energy, micro grid and other fields. This paper takes the two-terminal flexible DC transmission system as the research object, establishes the mathematical mode of two-terminal flexible DC transmission system, and studies the basic operation mode of the system and the voltage source converter (VSC) control strategy on this basis. Considering the problems of control delay and poor responsiveness of current closed-loop control when the traditional deadbeat control is applied to VSC converters, an improved deadbeat control strategy is proposed to solve the above-mentioned defects by predicting the current sampling at k+2 moment. Finally, the co-simulation is used to verify the correctness and reliability of the above-mentioned method.

Design and implementation of maximum constant boost switched inductor z-source inverter for three-phase on-line uninterrupted power supply

2015 ◽  
Vol 34 (4) ◽  
pp. 1101-1121 ◽  
Author(s):  
K. Chitra ◽  
A. Jeevanandham
Keyword(s):  
Power Supply ◽  
Current Source ◽  
Experimental Results ◽  
Voltage Source ◽  
Pwm Control ◽  
Content Type ◽  
Third Harmonic ◽  
Three Phase ◽  
Voltage Stress ◽  
On Line

Purpose – The purpose of this paper is to present the Switched Inductor Z-Source Inverter (SLZSI) topology for three-phase on-line uninterruptible power supply (UPS) by employing third harmonic injected maximum constant boost pulse width modulation (PWM) control. Conventional UPS consists of step-up transformer or boost chopper along with voltage source inverter (VSI) which reduces the efficiency and increases energy conversion cost. The proposed three-phase UPS by using SLZSI has the voltage boost capability through shoot through zero state which is not available in traditional VSI and current source inverter. Design/methodology/approach – Performance of three-phase on-line UPS based on ZLZSI by using third harmonic injected maximum constant boost PWM control is analyzed and evaluated in MATLAB/Simulink software and the results are compared with Z-source inverter (ZSI) fed UPS. Experimental results are presented for the validation of the simulation and theoretical analysis. Findings – The output voltages, currents, THD values, voltage stress and efficiencies for different loading condition are determined and compared with the theoretical values and UPS with ZSI. The experimental results validate the theoretical and simulation results. Originality/value – Compared with the traditional ZSI, the SLZSI provides high-voltage boost inversion ability with a very short shoot through zero state. This proposed UPS by using SLZSI increases the efficiency with less number of components, reduces the harmonics, increases the voltage gain and reduces the voltage stress.

Simplified Model and Control Strategy of Three-Phase PWM Current Source Rectifiers for DC Voltage Power Supply Applications

2015 ◽  
Vol 3 (4) ◽  
pp. 1090-1099 ◽  
Author(s):  
Yu Zhang ◽  
Yongxian Yi ◽  
Peimeng Dong ◽  
Fangrui Liu ◽  
Yong Kang
Keyword(s):  
Control Strategy ◽  
Power Supply ◽  
Current Source ◽  
Simplified Model ◽  
Dc Voltage ◽  
Three Phase ◽  
And Control

Novel Design for LC-VSI Double-Loop Control System of Microsources in Microgrid Based on Typical System Setting Method

2014 ◽  
Vol 556-562 ◽  
pp. 2436-2439
Author(s):  
Jia Ming Li ◽  
Peng Li
Keyword(s):  
Control System ◽  
Power Control ◽  
Control Strategy ◽  
Voltage Source ◽  
Double Loop ◽  
Loop Control ◽  
Typical System ◽  
Loop Control System ◽  
Lc Filter ◽  
Novel Design

Control strategy of inverter is the foundation of microsource’s power control. Based on a typical system setting method, double-loop control system of LC filter and inverter for voltage-source inverter in microgrid is designed. The feasibility is verified via the simulation.

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