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Method for controlling sliding mode of simplified model based three-phase parallel connection type active power filter (APF)

A power filter and simplified model technology, applied in active power filtering, harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve problems such as poor robustness, inability to compensate, and poor compensation effects

Inactive Publication Date: 2011-08-17
CENT SOUTH UNIV
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Problems solved by technology

[0003] Traditional digital control methods for active power filters, such as space vector modulation, predict the command current at the next time node based on inertia, and the compensation effect is poor when the current changes drastically, especially when the load is switched.
The load in the actual power grid changes very frequently, and the existing active power filter cannot have a better compensation effect when the load changes, and the robustness is poor

Method used

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  • Method for controlling sliding mode of simplified model based three-phase parallel connection type active power filter (APF)
  • Method for controlling sliding mode of simplified model based three-phase parallel connection type active power filter (APF)
  • Method for controlling sliding mode of simplified model based three-phase parallel connection type active power filter (APF)

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Embodiment 1

[0045] 1) System modeling in the three-phase coordinate system (abc)

[0046] The topology of the three-phase shunt active power filter (see figure 1 ), according to Kirchhoff’s nodal voltage law, there is the following formula:

[0047] v a = L di a dt + v XM + v MN

[0048] v b = L di b dt + v YM + v MN - - - ( 1 )

[0049] v c = L di c dt + v ZM + v MN ...

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Abstract

The invention discloses a method for controlling the sliding mode of a simplified model-based three-phase parallel connection type active power filter (APF). The concrete method comprises the following steps of: establishing a control model of a three-phase parallel connection type APF according to a circuit theory; converting a three-dimensional nonlinear control model into two isomorphic one-dimensional linear models according to the characteristic of less direct current side voltage change of the APF; designing a sliding mode function by adopting a constant speed reaching law method and deducing a novel control method according to a sliding mode control theory; and then compensating direct current side voltage fluctuation according to fundamental wave current by adopting a PI (Proportional-Integral) controller. Tests prove that the method can be used for favorably compensating power grid harmonic waves under the condition of power grid load change. In the method, the movement characteristics of the system on the sliding mode surface are irrelevant to the system parameters, and the method shows strong robustness and is suitable for the fluctuation of loads in a power grid to obtain a favorable harmonic wave compensation effect.

Description

technical field [0001] The invention relates to a sliding mode control method of a three-phase parallel active power filter based on a simplified model. The invention is used for the control of a three-phase parallel active power filter so that it can maintain a good current compensation performance. Background technique [0002] With the wide application of frequency conversion speed control devices, rectifiers and various power electronic equipment in the power grid, a large number of harmonics and reactive currents have been injected into the power grid, causing serious pollution to the power grid environment, affecting the normal use of power grid equipment, and even cause security problems. In order to reduce the harmonic and reactive current in the grid, reactive power compensation devices and active power filters can be used to compensate the harmonic and reactive components of the grid current. The reactive power compensation device can only compensate fixed harmon...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/22Y02E40/40Y02E40/20
Inventor 胡志坤何志敏华长春丁家峰王会海张乾
Owner CENT SOUTH UNIV
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