A Control Method for Active Power Filters with Three-Level NPC Inverter

2011 ◽  
Vol 268-270 ◽  
pp. 428-433
Author(s):  
Chen Guo ◽  
Cun Bing Gui ◽  
Zhong Ren Chen
Keyword(s):  
Control Algorithm ◽  
Control Method ◽  
Sampling Period ◽  
Active Power ◽  
Pi Control ◽  
State Variables ◽  
Active Power Filters ◽  
Power Filters ◽  
Repetitive Nature ◽  
Periodic Error

This paper researches control problem for active power filters with three-level NPC inverter and proposes a novel PI control algorithm for tracking harmonic command current. This novel PI control algorithm can suppress the periodic error in the whole system to achieve zero steady error tracking. In this scheme, the state variables are estimated with a state observer to cancel the delay of one sampling period in this digital control system. Harmonic current is predicted with a repetitive algorithm simultaneity, which makes use of the repetitive nature of load current. The controller is analyzed and designed in the paper, and the experiment results illustrate that this APF can be controlled in a satisfactory way.

scholarly journals An Improved Control Method Based on Source Current Sampled for Shunt Active Power Filters

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1405 ◽  
Author(s):  
Xudong Cao ◽  
Kun Dong ◽  
Xueliang Wei
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Active Power ◽  
Current Control ◽  
Pi Control ◽  
Current Loop ◽  
Active Power Filters ◽  
Power Filters ◽  
Source Current ◽  
The Impact

Active power filters (APFs) are dynamic power electronic devices that suppress harmonics and reactive power. To simplify the detection and extraction of traditional APF harmonics and reactive current, this paper proposes a direct source current control based on a three-phase three-wire shunt APF. The compensation principle and control method of the source current are analyzed systematically. The currents can be controlled without static errors by a proportional-integral (PI) controller in d-q rotating coordinates. Therefore, the compensation accuracy and dynamic performance of the system can be improved by the control strategy. Moreover, considering the grid voltage fluctuations, a droop regulator is proposed to address the impact of DC-link voltages on APF power losses and compensation performance. The regulator is combined with a traditional voltage outer loop PI control to achieve a comprehensive optimization between the power loss and compensation performance of the APF system. Finally, the inner current loop and the outer voltage loop form a double closed-loop cascade PI control structure to achieve the control effect of the APF. Simulation and experimental results verified the validity and feasibility of the APF control approach.

Control Method for Fault-Tolerant Active Power Filters

2015 ◽  
Vol 15 (3) ◽  
pp. 796-805 ◽  
Author(s):  
Chenyu Zhang ◽  
Jianyong Zheng ◽  
Jun Mei ◽  
Kai Deng ◽  
Fuju Zhou
Keyword(s):  
Control Method ◽  
Fault Tolerant ◽  
Active Power ◽  
Active Power Filters ◽  
Power Filters
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