An active damping method for parallel operation of active power filters

A power filter and damping technology, which is used in active power filtering, AC network to reduce harmonics/ripples, etc., to reduce resonance phenomenon, reduce high-frequency harmonic current, and improve compensation effect.

Active Publication Date: 2019-01-08
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing grid-connected current feedback active damping method, and propose an active damping method for parallel operation of active power filters, which can reduce the resonance of multiple active power filters in parallel operation, and significantly reduce the Minimize the high-frequency harmonic current output to the grid to improve the compensation effect

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  • An active damping method for parallel operation of active power filters
  • An active damping method for parallel operation of active power filters
  • An active damping method for parallel operation of active power filters

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[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] Such as figure 1 As shown, the active damping method for parallel operation of the active power filter of the present invention includes the following steps, and each active power filter in the parallel operation system independently performs all steps:

[0027] Step 1, such as figure 2 In the second-order differential link shown, each active power filter performs a second-order differential on its own output current: record the output current i of the first two control cycles gk1 with i gk2 , after the start of a new control cycle, detect the current output current i g , the control period is defined as T s , the second order differential u of the active power filter output current f Expressed as:

[0028]

[0029] Step 2. Calculate the adaptive damping coefficient: Calculate the adaptive damping coefficient K according to the...

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Abstract

The invention relates to an active power filter parallel operation active damping method. The method includes the following steps of: output current secondary quadratic differential calculation: the actual output current values of the first two control periods are recorded, when a current control period starts, the actual output current value of the current control period is read, and the quadratic differential value of output current is calculated based on the actual output current value and the output current values of the first two control periods; and adaptive damping coefficient calculation: an adaptive damping coefficient is calculated according to parameters such as the number of parallel units and power grid inner impedance, and the quadratic differential value of the output current is multiplied by the adaptive damping coefficient, so that an active damping set value can be obtained.

Description

technical field [0001] The invention relates to an active damping method for parallel operation of an active power filter. Background technique [0002] As more and more nonlinear loads are connected to the power grid, the harmonic pollution of the grid current is becoming more and more serious. The active power filter (APF) has been widely concerned and researched, and a large number practical application device. Because of the convenience and flexibility of use and low cost, multiple parallel operation has become an important form of large-capacity active power filter applications. Inductor-capacitor-inductor (LCL) filters are increasingly used in active power filters due to their strong high-frequency attenuation capability and small total inductance. [0003] However, due to the resonance problem of the LCL filter, its practical application is affected. The grid-connected current feedback method is a commonly used active damping method, which can improve the resonance...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 许晓笛李子欣楚遵方王平李耀华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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