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A three-phase three-level active filter control method incorporating anti-disturbance technology

A source filter, active disturbance rejection control technology, applied in electrical components, circuit devices, AC network circuits, etc.

Active Publication Date: 2018-09-07
NORTHEAST DIANLI UNIVERSITY
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  • Claims
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Problems solved by technology

Therefore, there is a trade-off between output voltage response speed and ripple amplitude

Method used

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  • A three-phase three-level active filter control method incorporating anti-disturbance technology
  • A three-phase three-level active filter control method incorporating anti-disturbance technology
  • A three-phase three-level active filter control method incorporating anti-disturbance technology

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Embodiment Construction

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

[0062] In order to improve ...

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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 technical field of power electronics, in particular to a three-phase three-level active filter control method integrated with anti-disturbance technology. Background technique [0002] With the massive application of nonlinear loads such as nonlinear power electronic devices, the problem of harmonics in power systems is becoming more and more serious, which also promotes the development of active power filters for harmonic control. The topology of the active power filter has developed from the original two-level structure to the three-level structure. This not only reduces the withstand voltage strength of the original power electronic switch, but also can effectively reduce the operating frequency of the power electronic switch, increase its equivalent switching frequency and utilization efficiency, and then improve the compensation effect of high-frequency subharmonic current. [0003] Because of its simple principle and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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