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A hybrid state feedback virtual damping control method for lcl type active power filter

A technology of power filter and mixed state, which is applied in the field of active power filter control, can solve the problems of increasing SAPF hardware design difficulty and manufacturing cost, achieve the effect of reducing hardware design difficulty and manufacturing cost, and suppressing resonance peaks

Active Publication Date: 2020-08-18
ZHEJIANG UNIV OF TECH
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Problems solved by technology

However, if the filter capacitor current feedback control is used, an additional set of current sensors is required to collect the filter capacitor current, which increases the difficulty of hardware design and manufacturing cost of SAPF

Method used

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  • A hybrid state feedback virtual damping control method for lcl type active power filter
  • A hybrid state feedback virtual damping control method for lcl type active power filter
  • A hybrid state feedback virtual damping control method for lcl type active power filter

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention will be further described.

[0031] refer to Figure 1 ~ Figure 4 , a hybrid state feedback virtual damping control method for an LCL type active power filter, comprising the following steps:

[0032] a. Acquisition of current signal

[0033] Use two sets of current sensors to collect grid side current i s and inverter side current i 1 ;

[0034] b. Hybrid state feedback control

[0035] grid side current i s and inverter side current i 1 The difference is used as a state variable, after passing through a second-order high-pass filter, it is fed back to the inverter side voltage u i ;

[0036] c. Current control

[0037] The fundamental wave loop adopts the control strategy of the voltage outer loop plus the current inner loop to obtain the fundamental wave loop current control command, and the harmonic loop uses the second-order generalized integrator SOGI to control the harmonics without st...

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Abstract

The invention discloses a hybrid state feedback virtual damping control method for an LCL-type active power filter. The method comprises the following steps: a, using two groups of current sensors to collect current is at the position of a PCC and current il on the side of an inverter respectively; b, taking a difference value of current is at the position of the PCC and current il on the side of the inverter as a state variable, after passing through a second-order high-pass filter, feeding back to voltage ui on the side of the inverter; c, using a control strategy of voltage outer ring plus current inner ring by a fundamental wave ring to obtain a fundamental wave ring current control command, and carrying out astatic control on harmonic waves by using a second-order generalized integrator SOGI by a harmonic wave ring to obtain a harmonic ring current control command; and d, taking the sum of the fundamental wave ring current control command obtained in step c and the harmonic ring current control command and a feedback valve obtained through step a as active power filter control signals, and controlling the on-off action of a power device to generate compensating current. According to the method, active damping control of the LCL-type filter is realized by using an original sensor of the SAPF, so that a harmonic peak is inhibited.

Description

technical field [0001] The invention relates to the technical field of active power filter control, and specifically designs a method for suppressing resonance peaks of an LCL type active power filter. Background technique [0002] With the use of a large number of power electronic devices in the grid, it brings serious harmonic pollution. Compared with passive filters, shunt active power filters (Shunt Active Power Filter, SAPF) have obvious advantages in terms of stability and flexibility, and are currently the most effective method for controlling power harmonics. [0003] The high-order harmonics generated by the SAPF itself due to carrier modulation must be filtered out by L or LCL filters. The LCL filter is a third-order system, and it has better high-frequency suppression performance than the L-type filter when the total inductance value is equal. The transfer function of the LCL filter lacks a second-order item, which causes it to generate a resonance peak at a spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/01
CPCH02J3/01H02J3/1842Y02E40/20
Inventor 潘国兵金裕嘉王坚锋何铁锋欧阳康金丽炳
Owner ZHEJIANG UNIV OF TECH
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