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Novel current control method for active power filter

A technology of power filter and current control, which is applied in active power filter and AC network to reduce harmonics/ripples, etc. It can solve the problems of high investment cost, complex structure, and influence on control performance, and achieve good control performance, Simple structure, to achieve the effect of harmonic compensation

Inactive Publication Date: 2017-06-20
申久祝
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AI Technical Summary

Problems solved by technology

In the traditional control method, it is required to detect the harmonic current, generate the reference current and require the filter current to follow the reference current in real time. The structure is complex, the investment cost is high, and the control performance is affected by many aspects.

Method used

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  • Novel current control method for active power filter

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Embodiment Construction

[0015] As shown in the figure, the present invention includes a main circuit module, a power switch driving module, a DSP development board, a voltage outer loop, a current inner loop and a phase-locked loop.

[0016] The main circuit adopts a three-phase fully-controlled bridge circuit, and the fully-controlled device adopts IGBT, which has the advantages of high input impedance, good thermal stability, high operating frequency, high voltage and current resistance, and low driving power. The IGBT is used as the basic power switching element to form a dedicated functional module of the three-phase inverter.

[0017] The active power filter system of the indirect current control strategy is composed of two control loops, a voltage outer loop and a current inner loop. The voltage outer loop is designed to keep the DC side voltage of the active power filter constant, follow the reference voltage, and help the active power filter respond to sudden load changes to maintain system s...

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Abstract

A novel current control method for an active power filter is disclosed. The control method is based on an indirect current control strategy, that is, does not need to perform load current measurement and harmonic detection but to directly extracts the grid current in the grid side, and controls the grid current by using a proportional integral controller and a vector proportional integral controller in combination, thereby achieving harmonic compensation. A harmonic compensator comprises a PI (Proportional Integral) controller and a VPI (Vector PI) controller in parallel, and operates under a fundamental frequency rotating coordinate system. The PI-VPI controller compensation method makes the active power filter simple in structure and has better performance compared to a conventional method. In addition, the PI-VPI controller compensation method can not only compensate for harmonic current, but also allows the grid side to obtain the unit power factor.

Description

technical field [0001] The invention belongs to the field of harmonic current control, in particular to a parallel active power filter based on an indirect current control strategy. Background technique [0002] In the power system, the harmonics generated by various harmonic sources also cause serious pollution to the power system environment. Especially with the increasingly widespread application of nonlinear loads such as power electronic devices, the harmonics and reactive power generated by them have a great impact on power quality, and the concept of power quality has also emerged. Improving power quality is of great significance to the safe and economical operation of power grids and electrical equipment, the guarantee of product quality, and the normal operation of people's production and life. [0003] In view of the above problems, the commonly used solution is to use filters. Commonly used filters mainly include passive filters and active power filters. Passive ...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 申久祝
Owner 申久祝
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