Three-phase three-level active filter control method of fused anti-disturbance technology

A technology of source filter and control method, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc.

Active Publication Date: 2016-12-21
NORTHEAST DIANLI UNIVERSITY
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Problems solved by technology

Therefore, there is a trade-off between outpu

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  • Three-phase three-level active filter control method of fused anti-disturbance technology
  • Three-phase three-level active filter control method of fused anti-disturbance technology
  • Three-phase three-level active filter control method of fused anti-disturbance technology

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Embodiment Construction

[0061] Reference figure 1 , Where i sa , I sb , I sc Represents the three-phase current of the grid side power supply; i la , I lb , I lc Represents the three-phase load current of the nonlinear load; i ca , I cb , I cc Represents the three-phase compensation current output by the active filter; u sa , U sb , U sc Is the three-phase power supply voltage; L sa , L sb , L sc Represents the equivalent inductance of the three-phase filter reactor of the active filter; R sa , R sb , R sc Indicates the equivalent resistance of the three-phase filter reactor of the active filter; C d Indicates the DC capacitance of the active filter; u dc1 ,u dc2 Represents the voltage drop across two DC capacitors respectively; the 12 switches of the three phases A, B, and C are abbreviated as T j1,2,3,4(j=a,b,c) ; R, S, T are the nodes of the active filter connected to the output filter circuit of each phase; point O is the neutral point of the three-phase power supply.

[0062] In orde...

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Abstract

A three-phase three-level active filter control method of a fused anti-disturbance technology is disclosed. During actual engineering, output filter equivalence inductance and equivalence resistance parameters of an active electric power filter can be deviated from designed parameter values because of being influenced by an operating temperature and other environment factors; and operation of an active filter is unavoidably influenced by various kinds of disturbance factors. Aiming at the above problems, the method is characterized by based on an expanded ohm law in a non-sinusoidal alternating-current circuit, carrying out on-line real-time detection on three-phase output filter equivalence resistance and equivalence inductance parameters of the active electric power filter; and then sending the actually-measured equivalence resistance and equivalence inductance parameters to a controller of the active electric power filter so as to update a corresponding control parameter; and simultaneously introducing auto-disturbances-rejection control into an active filter direct voltage control outer loop. Stability of the active electric power filter can be increased, harmonic wave compensation precision of the active electric power filter is improved, a direct-voltage transient response speed of the active electric power filter is increased and a ripple amplitude is reduced.

Description

Technical field [0001] The invention relates to the field of power electronics technology, in particular to a three-phase three-level active filter control method fused with anti-disturbance technology. Background technique [0002] With the large-scale application of nonlinear loads such as nonlinear power electronic devices, the problem of harmonics in the power system has become increasingly serious, which has also promoted the development of active power filters for harmonic control. The topology of the active power filter has evolved from the original two-level structure to a three-level structure. This not only reduces the withstand voltage strength of the original power electronic switch, but also effectively reduces the working frequency of the power electronic switch, improves its equivalent switching frequency and utilization efficiency, and improves the compensation effect of high-frequency sub-harmonic currents. [0003] Deadbeat control is widely used in two-level and...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1857Y02E40/30Y02E40/40
Inventor 金国彬李玲李国庆王振浩
Owner NORTHEAST DIANLI UNIVERSITY
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