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Active power filter parallel operation active damping method

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

Active Publication Date: 2017-04-26
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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[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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  • Active power filter parallel operation active damping method
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  • Active power filter parallel operation active damping method

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

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

[0027] Step one, such as figure 2 In the second-order differentiation link shown, each active power filter performs second-order differentiation on its own output current: record the output current i of the first two control cycles gk1 With i gk2 , After the new control cycle starts, check the current output current i g , The control period is defined as T s , The second-order derivative of the output current of the active power filter u f Expressed as:

[0028]

[0029] Step 2: Calculate the adaptive damping coefficient: calculate the adaptive damping coefficient K according to the active power filter pa...

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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 active power filters in parallel operation. Background technique [0002] As more and more nonlinear loads are connected to the grid, the harmonic pollution of grid current is becoming more and more serious. Active power filters (APF) have always received extensive attention and research, and a large number of The actual application device. Because of its convenience, flexibility and low cost, parallel operation of multiple units has become an important form of application of large-capacity active power filters. Inductance-capacitor-inductance (LCL) filters are increasingly used in active power filters due to their strong high-frequency attenuation ability and small total inductance. [0003] However, due to the resonance problem of the LCL filter, its application in practice is affected. The grid-connected current feedback method is a more commonly used active damping method, which can improve the reso...

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Application Information

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Patent Type & Authority Applications(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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