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Improved FBD harmonic current detection method based on adaptive principle

A harmonic current and harmonic detection technology, applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., can solve the problem that the FBD algorithm cannot take into account the response speed and control precision self-adaptive algorithm

Active Publication Date: 2013-12-25
SOUTHEAST UNIV
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Problems solved by technology

[0005] Purpose of the invention: In order to solve the problem that the traditional FBD algorithm cannot take into account the two technical indicators of response speed and control accuracy, and the self-adaptive algorithm needs to be reconfigured when used in a three-phase system, the present invention designs an active filter based An improved FBD harmonic current detection algorithm based on the principle of self-adaptation, and based on the proposed algorithm, the core of the self-adaptive algorithm is improved, and an acceleration algorithm based on the principle of phase shift positive feedback is introduced

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  • Improved FBD harmonic current detection method based on adaptive principle
  • Improved FBD harmonic current detection method based on adaptive principle
  • Improved FBD harmonic current detection method based on adaptive principle

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Embodiment 1

[0162] Use Matlab / Simulink software to build such as Image 6 The simulation model of the three-phase three-wire nonlinear load shown. The rectified full bridge is used as the nonlinear load to simulate the harmonic source. The system simulation parameters are shown in Table 1.

[0163] Table 1 Simulation parameters

[0164]

[0165] In order to verify the response speed of the improved FBD harmonic current detection algorithm based on the adaptive principle when the load current changes suddenly, the switch on the rectifier side is now controlled to be put into parallel load at 0.1s.

[0166] Figure 7 It is the fundamental waveform of the three-phase circuit detected by the algorithm when the load changes suddenly. Compared with the traditional FBD method, the dynamic response characteristics of the FBD detection algorithm based on the adaptive principle have been greatly improved. The fundamental wave component of the system can be accurately tracked in less than 1 / ...

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Abstract

The invention discloses an improved FBD harmonic current detection method based on an adaptive principle. The improved FBD harmonic current detection method comprises the following steps: output information of a traditional FBD harmonic current detecting algorithm is fed back to an input terminal to form a closed-loop detection system; an adaptive algorithm inner core is used for replacing a low pass filter in a traditional FBD algorithm and is improved; an obtained harmonic signal is imported into the input terminal through a phase shift positive feedback element. According to the improved FBD harmonic current detection method based on the adaptive principle, the advantage that a traditional FDB harmonic current detection method is wide in application range is reserved, closed-loop control is formed by the FBD algorithm, and therefore the anti-jamming capability of the system is enhanced; meanwhile, the phase shift positive feedback element is imported to the current input terminal of the system, and therefore a high response speed of the harmonic current detection method to a current sudden change of the system is reserved; the improved FBD harmonic current detection method based on the adaptive principle is suitable for an SAPF system with a DSP as a core control chip.

Description

technical field [0001] The invention relates to an improved FBD harmonic current detection method based on an adaptive principle, belonging to the technical field of power quality. Background technique [0002] In recent years, with the use of nonlinear loads of power electronic devices and a large number of distributed power generation systems connected to the distribution network, the harmonic content of the grid current has increased sharply. power quality problems. Among the existing technical means, the power active filter (APF) technology is an effective means to control the harmonic pollution of the power grid, and the efficient harmonic detection algorithm is the premise to ensure the reliable operation of the APF. The proposed wave detection algorithm has positive significance for solving the problem of harmonic pollution in power system. [0003] The commonly used harmonic detection algorithms mainly include FFT algorithm based on Fourier decomposition, ip-iq alg...

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Application Information

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IPC IPC(8): G01R19/00
Inventor 吴在军施晔窦晓波胡敏强秦申蓓
Owner SOUTHEAST UNIV
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