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Multilevel active power filter based on LCL filtering

A power filter, multiple technology, applied in active power filter, AC network to reduce harmonics/ripples and other directions, can solve the problems of poor dynamic performance of APF, high switching frequency requirements of power devices, etc., to solve the problem of circulating current The effect of suppressing problems, improving accuracy and flexibility, improving real-time and rapidity

Inactive Publication Date: 2014-07-09
HUAIYIN INSTITUTE OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

If the inductance is too large, the compensation current changes slowly, and the dynamic performance of the APF is not good; if the over-inductance is too small, the compensation current changes quickly, and the dynamic performance of the APF is high, but the switching frequency of the power device is required to be high, and the compensation current contains a large amount of higher harmonics of

Method used

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  • Multilevel active power filter based on LCL filtering
  • Multilevel active power filter based on LCL filtering
  • Multilevel active power filter based on LCL filtering

Examples

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Embodiment

[0027] Example: figure 1 It is the three-phase four-wire parallel multiple APF topology structure of the present invention and the internal topology structure of each parallel converter. For ease of understanding, figure 2 A structural diagram of the mathematical model of the APF system of the present invention is given. The switching function defining each bridge arm is:

[0028] And the output voltage of the converter is:

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Abstract

The invention relates to a multilevel active power filter based on LCL filtering. The multilevel active power filter comprises a two-level three-phase four-bridge arm current transformer, a three-phase LCL output filter and a shunt capacitor. The output end of the three-phase LCL output filter is connected with a three-phase power grid, the input end of the three-phase LCL output filter is connected with a bridge arm port of the three-phase four-bridge arm current transformer, a zero-sequence bridge arm of the three-phase four-bridge arm current transformer is connected with a three-phase power grid null line through a filter inductor, and direct current bus sections of all sets of current transformer bodies of the three-phase four-bridge arm current transformer are respectively connected with the two ends of the capacitor. By the adoption of the multilevel active power filter, the problem of harmonic wave and three-phase imbalance in a three-phase four-wire system is solved.

Description

technical field [0001] The invention relates to the technical field of power system harmonic suppression, in particular to a multiple active power filter based on LCL filtering. Background technique [0002] In recent years, with the rapid development of power electronic technology, especially the development of power semiconductor devices and power electronic converter technology, various power electronic devices have emerged in an endless stream, and have been widely used in various industries. However, power electronic devices are nonlinear loads, which also bring great harm to the power supply quality of the power system during their operation, such as harmonics, electromagnetic radiation, etc., which not only pollute the public power grid, but also deteriorate other electrical equipment. The application environment, especially the vigorous growth of high-precision electrical equipment in recent years, the harm caused by the deterioration of power quality has reached the...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 丁祖军刘保连张宇林
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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