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Harmonic current estimation method based on improved FastICA algorithm

A harmonic current and harmonic voltage technology, applied in the field of harmonic current estimation, can solve the problems of high cost of harmonic measurement equipment and difficulty in obtaining harmonic impedance, and achieve the effects of solving difficult determination, improving accuracy, and overcoming high cost

Inactive Publication Date: 2015-10-14
HOHAI UNIV
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Problems solved by technology

[0003] The purpose of the present invention overcomes the deficiencies in the prior art, proposes a harmonic current estimation method based on the improved FastICA algorithm, and solves the technical problems that the harmonic measurement equipment is expensive and the actual harmonic impedance of the system is difficult to obtain

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  • Harmonic current estimation method based on improved FastICA algorithm
  • Harmonic current estimation method based on improved FastICA algorithm
  • Harmonic current estimation method based on improved FastICA algorithm

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[0048] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0049] figure 1 It is a flow chart of the harmonic current estimation method based on the improved FastICA algorithm of the present invention. The present invention proposes a harmonic current estimation method based on the improved FastICA algorithm, which is characterized in that the quasi-Newton method is used instead of the Newton method as Optimization method for FastICA.

[0050] Specifically include the following steps:

[0051] SS1 measures the harmonic voltage of the busbar: the harmonic injection current is selected as the state variable in the harmonic power flow equation, and the harmonic voltage of the node is used as the quantity measurement, ignoring the measurement error, the m...

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Abstract

The present invention discloses a harmonic current estimation method based on an improved FastICA algorithm. The harmonic current estimation method is characterized in that a quasi-Newton method is adopted to replace a Newton method as an optimization method of FastICA. The present invention has the beneficial effects that (1) harmonic currents in a power grid can be accurately estimated in the condition of unknown harmonic impedance; (2) the problems that a harmonic measuring device is difficultly obtained by the actual harmonic impedance of a system, and the cost is great are overcome; and (3) compared to the original method, the harmonic current estimation method is capable of improving the accuracy of the algorithm and better solving the problem that the harmonic impedance is difficult to determine.

Description

technical field [0001] The invention relates to a harmonic current estimation method based on an improved FastICA algorithm, and belongs to the technical field of power system power quality. Background technique [0002] In the field of harmonic research, the identification of harmonic sources is a very important issue, which is of great significance to the division of harmonic responsibilities and the governance of harmonics. Most of the existing methods are based on the harmonic source identification when the harmonic impedance is known. However, in the actual system, it is difficult to obtain the accurate harmonic parameters of the power grid. Therefore, it is necessary to strengthen research on how to estimate the state of harmonic sources using known harmonic measurement information when the harmonic impedance is unknown. The advantage of the Newton algorithm is that it has second-order local convergence characteristics, but the disadvantage is that it has high require...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01G06F19/00
CPCY02E40/40
Inventor 任立志马宏忠宋树平许高俊张正东梁欢姜鸿羽
Owner HOHAI UNIV
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