Based on Adaptive Algorithm Is Embedded into the Low Pass Filter APF Harmonic Current Detection

APF harmonic detection is the study of the most important parts of the core , quickly and accurately detect the harmonic current is able to quickly output harmonic compensation circuit current of the premise. Delay compensation system is based on the increase in the method specified time compensation angle , which can accurately detect the harmonic current at the same time , the low-pass filter to minimize the time delay generated by MATLAB simulation, the use of delay compensation system active Filter harmonic Detection and Compensation excellent performance, while ensuring high precision detection and compensation while ensuring at the same time , and fully complete filter real-time functionality .

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An Improved Harmonic Current Detection Method Based on Variable Forgetting Factor RLS Algorithm

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.291-294.2459 ◽

2013 ◽

Vol 291-294 ◽

pp. 2459-2463

Author(s):

Minh Guang Vu ◽

Wei Han ◽

Da Zhi Wang ◽

Yun Lu Li

Keyword(s):

Dynamic Process ◽

Detection Algorithm ◽

Recursive Least Squares ◽

Forgetting Factor ◽

Harmonic Current ◽

Pass Filter ◽

Low Pass Filter ◽

Variable Forgetting Factor ◽

The Impact ◽

Current Detection

The effects of compensating and restraining the power system harmonics using active power filter are determined by the detection precision and its dynamic response characters. To improve both of them, a harmonic current detection algorithm based on variable forgetting factor Recursive Least-Squares algorithm is presented. The occurrence of the dynamic process is identified firstly by the judgment condition which is given by the algorithm, and then the forgetting factor is assigned dynamically, so that the convergent speed is significantly improved. The algorithm overcomes the impact of low-pass filter of traditional p-q or ip-iq algorithm, and releases the contradiction cased by the conflicting requirements of forgetting factor value between steady process and dynamic process. So it has better dynamic performance. Simulation and experiments prove the validity and feasibility of the approaches.

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Low pass filter installation for reducing harmonic current emissions from LED lamps based on EMC standard

2016 International Conference on Control, Electronics, Renewable Energy and Communications (ICCEREC) ◽

10.1109/iccerec.2016.7814966 ◽

2016 ◽

Cited By ~ 4

Author(s):

Fajar Abdul Karim ◽

Mohamad Ramdhani ◽

Ekki Kurniawan

Keyword(s):

Harmonic Current ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

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Based on System Delay Time to Compensate for Harmonic Current Detection Method Research

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.614-615.953 ◽

2012 ◽

Vol 614-615 ◽

pp. 953-956

Author(s):

Xin Yao ◽

Zai Lin Yao ◽

Xin Ying Teng

Keyword(s):

Reactive Power ◽

Detection Method ◽

Matlab Simulation ◽

System Delay ◽

Harmonic Current ◽

Harmonic Compensation ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass ◽

Pros And Cons

Harmonic detection is one of the most important core part of Active Power Filter,which can quickly and accurately detect the harmonic current that is the premise of circuit to quickly output harmonic compensation current,therefore the pros and cons of the detection method,a direct impact on the effect of harmonic compensation.Time compensation method is to add a specific time compensation angle based on the method of instantaneous reactive power compensation,so that it can accurately detect the harmonic currents at the same time,minimize the low-pass filter time delay.By MATLAB simulation,the results show high detection accuracy.And to ensure detection and compensation,while fully to improve the real-time function of the filter.

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Eddy Current Detection for Weld Defect and Automatic Separating System for Defective HFW Pipe

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.457-458.344 ◽

2013 ◽

Vol 457-458 ◽

pp. 344-349

Author(s):

Xiao Qin Shen ◽

Fu Sheng Yu ◽

Ying Bao

Keyword(s):

Eddy Current ◽

Pass Filter ◽

Low Pass Filter ◽

Weld Defect ◽

Low Pass ◽

Phase Sensitive ◽

Welded Pipe ◽

Phase Sensitive Detector ◽

The Mathematical Model ◽

Current Detection

An eddy current detection and automatic separating system is developed to defect the weld defects in HFW pipe and separate the defective pipe. Application of phase sensitive detector, the pure signal of the weld defect is obtained through a low-pass filter. The information of the weld defect signal, the displacement of flying saw and the welding speed of welded pipe are fused together. The mathematical model is established for unfixed length truncation of the defective welded pipe. An automatic separating system is designed to cut and separate the defective welded pipes in the production line. The practice shows that this system can accurately detect the weld defect, cut the welded pipe in the perfect position and maximumly reserve the welded pipe without defect. This detection and separating system can improve the quality of the welded pipes and avoid the waste.

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Detection Experiment Research of Harmonic Current for Single-Phase Active Power Filter

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.701-702.297 ◽

2014 ◽

Vol 701-702 ◽

pp. 297-302

Author(s):

He Feng Shao ◽

Hui Min Quan

Keyword(s):

Single Phase ◽

Moving Average ◽

Response Speed ◽

Superior Performance ◽

Phase System ◽

Harmonic Current ◽

Reactive Component ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

In order to solve the problem of detecting harmonic and reactive currents of single-phase APF, the paper gives a detection method for real time harmonic current and reactive current. In the paper, it makes use of some characteristics of triangle function, and calculates the amplitude of active and reactive component from load current. Then the DC component can be extracted by using a low-pass filter, namely the required active component and reactive component. This paper analyzes the characteristics of two kinds of low pass filter, and selects the superior performance moving average filter for experiment. The paper introduces the design of the software and hardware process. The circuit configuration of the proposed approach used in the single-phase system is simple, its dynamic response speed is fast and its detection precision is high. The result of the experiment shows that the proposed approach is feasible and valid.

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