Research on AC Electronic Load

2014 ◽  
Vol 556-562 ◽  
pp. 1811-1813 ◽  
Author(s):  
Xue Fei Yan ◽  
Chang Qing Zhu ◽  
Yue Fei Zhao ◽  
Qiao Jing An
Keyword(s):  
Control Method ◽  
Current Method ◽  
Current Control ◽  
Control Mode ◽  
Pwm Converter ◽  
Model And Simulation ◽  
Electronic Load ◽  
Control Instruction ◽  
Hysteresis Control ◽  
Load Circuit

The AC electronic load circuit is studied, PWM converter is used in this circuit in order to achieve the simulation function of load characteristics.The methods of how to get the command current mathematical model and simulation module is given which is based of the Matlab/Simulink platform, Hysteresis control mode is used in order to get fast and stable actual current and then carried on the simulation of the proposed electronic load. The simulation results show that the proposed algorithm and the control instruction current method and the effectiveness of the current control method, realized the simulation of ac electronic load.

scholarly journals Digital Adaptive Hysteresis Current Control for Multi-Functional Inverters

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2422 ◽  
Author(s):  
Triet Nguyen-Van ◽  
Rikiya Abe ◽  
Kenji Tanaka
Keyword(s):  
High Speed ◽  
Power Flow ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Control Device ◽  
Current Control ◽  
Control Mode ◽  
Control Technique ◽  
Sampled Data ◽  
Hysteresis Current Control

This paper proposes a digital adaptive hysteresis current control method for multi-functional inverters in a power-flow control device called digital grid router. Each inverter can be controlled in master, grid-connected, or stand-alone modes, which can be specified by the controller. While the popular linear sine-triangle pulse width modulation (SPWM) control technique requires complicated proportional-integral (PI) regulators with an unavoidable time delay, hysteresis current control has a simple structure, fast responses, and robustness due to its independent system of parameters. Since the hysteresis current control method controls the output current stay around the reference current directly, in the multi-functional inverter, the reference output is not given by a current directly. Thus, the reference current used to implement the hysteresis current control in this study is calculated from the given reference voltage or power in each control mode. The controller uses high-speed sampled data at MHz level and is implemented by using a field-programmable gate array (FPGA). Experimental results show good performances of the proposed controller in controlling power exchanges in the digital grid router.

Double-Hysteresis Current Control Strategy of PWM Rectifier

2013 ◽  
Vol 433-435 ◽  
pp. 1037-1044
Author(s):  
Wen Shao Bu ◽  
Lei Lei Xu ◽  
Xian Bo Wang ◽  
Xin Win Niu
Keyword(s):  
Control Method ◽  
Current Control ◽  
Switching Frequency ◽  
Current Response ◽  
Pwm Rectifier ◽  
Hysteresis Current Control ◽  
Switching Power ◽  
Three Phase ◽  
Hysteresis Controller ◽  
Hysteresis Control

to hold the merits of the traditional hysteresis controller, and at the same time, hold back the change of switching frequency and reduce the switching power loss in hysteresis control of PWM rectifier, based on the relationship between line currents and switching status, an improved algorithm of double-hysteresis current control method for three-phase voltage-type PWM converter was proposed. In the strategy, the position of reference voltage vector can be detected by double hysteresis, PLL circuit can detect the output of switching states. The proposed algorithms not only hold the merits of traditional hysteresis, such as quick current response and current limited capacity, but also, it can overcome the drawback of non-fixed switching frequency of traditional hysteresis. The algorithm has been simulated and verified by MATLAB/simulink platform, and the system operates stably.

Fixed Frequency Hysteresis Control Based STATCOM

2011 ◽  
Vol 383-390 ◽  
pp. 5936-5939
Author(s):  
Jun Li Zhang ◽  
Jian Zhuo Li ◽  
Yu Ren Zhang
Keyword(s):  
Control Method ◽  
Response Speed ◽  
Fast Response ◽  
Current Control ◽  
Circuit Switching ◽  
Fixed Frequency ◽  
Direct Current Control ◽  
Static Compensator ◽  
Hysteresis Control ◽  
The Impact

The operation principle of STATCOM (Synchronous Static Compensator - STATCOM) is analyzed. To improve STATCOM response speed, and to sustain the STATCOM main circuit switching device operating frequency stability, the direct current control method is introduced. Fixed frequency hysteresis control method based on the traditional hysteresis control strategy is proposed. The proposed strategy is simple, high precision, fast response speed, while it has less fluctuation with the impact of load parameters, and good robust characteristics.

The Application of BP Algorithm in Electronic Load Current Control

2013 ◽  
Vol 846-847 ◽  
pp. 185-189
Author(s):  
Gui Xiu Jiang ◽  
Shu Jie
Keyword(s):  
Control Method ◽  
Sampling Frequency ◽  
Current Control ◽  
Bp Algorithm ◽  
Load Current ◽  
Hysteresis Current Control ◽  
Three Phase ◽  
Simulation Results ◽  
The Difference ◽  
Electronic Load

The current control method based on double hysteresis current control and space vector is taken, so that the current tracing control of three phase VSR can realized. The predictive current control based on BP algorithm is presented, and the drawback that there is beat during the control of SVPWM based on hysteresis can be made up, which has serious influence on the current tracing when the difference value changed violently. Without the rise of sampling frequency, the reference offset current of next time is predicted using of historical current. The simulation results show that the predictive current control based on BP algorithm is correct and valid. The deadbeat control of SVPWM based on hysteresis is realized, less harmonic current and better tracing are got.

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