A Two-Leg Converter and Control Strategy to Compensate the Three-Phase Imbalanced and Harmonic Currents

2021 ◽  
Author(s):  
Shuai Zhang ◽  
Linghui Meng ◽  
Jiangpeng Yang ◽  
Tao Yin ◽  
Weiwei Zhu ◽  
...  
Keyword(s):  
Control Strategy ◽  
Harmonic Currents ◽  
Three Phase ◽  
And Control

The Selective Harmonic Detection for the Integration Photovoltaic Generation and Active Power Filter

2011 ◽  
Vol 58-60 ◽  
pp. 781-786
Author(s):  
Yan Dan Lin ◽  
Li Qing Tong ◽  
Yao Jie Sun
Keyword(s):  
Control Strategy ◽  
Detection Method ◽  
Active Power Filter ◽  
Active Power ◽  
Positive Sequence ◽  
Harmonic Detection ◽  
Power Filter ◽  
Three Phase ◽  
Frequency Domains ◽  
And Control

To improve the utilization of the inverter of the photovoltaic grid connected systems and decrease the harmonic of the grid, a novel selective harmonic detection method based on the synchronous rotator frame is proposed. Utilizing three-phase Park transform, the rotator vector is transferred to the static vector, and the synchronous harmonic is separated and acquired. The characteristic of negative and positive sequence harmonic is fleetly and exactly presented in all frequency domains. Additional, a new control strategy based on this harmonic detection is proposed for the integration photovoltaic grid connected generation and active power filter. Validity and practicality of the proposed selective harmonic detection method and control strategy are proved.

Research on the Control Method of High Power APF for Oil Drilling Rig

2013 ◽  
Vol 734-737 ◽  
pp. 1450-1459
Author(s):  
Neng Qian Jiang ◽  
Ming Hua Zhu ◽  
Yi Feng Xie
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Electrical Equipment ◽  
Current Control ◽  
Harmonic Current ◽  
Oil Drilling ◽  
Drilling Rig ◽  
Harmonic Currents ◽  
Domain Transformation ◽  
And Control

The wide use of oil drilling rig brings nominated economic profits for oil drilling industry. However, it will bring about great quantities of harmonic current to the grid, lowering the power quality and reliability of the power grid. Meanwhile, harmonic currents will have a deteriorated influence to surrounding electrical equipment and grid. This paper studies the distribution characteristics of the harmonic current in the oil industry and puts forward a control strategy aiming for improving stability and reliability of the power supply system. This paper also proposes an algorithm for detecting harmonic current based on time domain transformation and control strategy based on two cascade (voltage and current) control loop. Experiment and simulation results validate the proposed control strategy.

Control Strategy for Fault-Tolerant Paralleling Active Power Filter

2013 ◽  
Vol 655-657 ◽  
pp. 1566-1570
Author(s):  
Jin Jie Peng ◽  
Xiao Ping Fan
Keyword(s):  
Control Strategy ◽  
Normal State ◽  
Fault Tolerant ◽  
High Reliability ◽  
Active Power Filter ◽  
Active Power ◽  
Power Filter ◽  
Harmonic Currents ◽  
Three Phase ◽  
Fault State

A control strategy for a fault-tolerant paralleling active power filter was proposed. The structure and running models of the fault-tolerant paralleling active power filter were given. When the inverter of APF had fault in some phase, the fault structure of the inverter was analyzed. Its fault-tolerant structure was three-phase four-switch. The bridge composed of two capacitors replaced the fault phase for the inverter based on three-phase four-switch. It was important to stay stable for inverter DC-side. The method to stabilize the DC-side voltage was proposed. The controlling strategy for APF working on both normal state and fault state was proposed. The simulating results showed that harmonic currents were suppressed by the fault-tolerant paralleling APF whether working on normal state or fault state. The DC-side voltage stayed stable and the system has high reliability.

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