APF control method based on active disturbance rejection and repetitive control

A technology of active disturbance rejection controller and power filter, applied in active power filtering, AC network to reduce harmonics/ripples, etc., can solve the problem of not taking into account the system robustness tracking waveform dynamic response and steady state response, etc.

Active Publication Date: 2014-11-05
STATE GRID CORP OF CHINA +3
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Problems solved by technology

And because the PWM inverter is inherently nonlinear and uncertain, the current waveform control technology proposed does no

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  • APF control method based on active disturbance rejection and repetitive control
  • APF control method based on active disturbance rejection and repetitive control
  • APF control method based on active disturbance rejection and repetitive control

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[0088] Example: In this example, Q(z) is simply taken as 0.95, and K in the compensator r =0.92, leading link Z k Used to compensate for the total phase lag, where Z is selected 5for phase compensation. Taking APF as the object, it is simulated and verified in the Matlab / Simulink environment. The simulation platform uses controllable thyristors, the sampling frequency is 20KHz, the maximum switching frequency is 10KHz, and the circuit parameters are: L=8mH, C=2500μF. The system parameters are: the phase voltage of the power supply is 200V / 50Hz, and the given value of the capacitor voltage is 600V.

[0089] Such as Figure 4 It is the waveform diagram of the three-phase voltage on the grid side; Figure 5 is the grid-side current waveform before filtering under the nonlinear load; Image 6 In order to use this method to invent the grid-side current waveform after APF filtering. Depend on Figure 5-6 It can be seen that under the proposed method, the output current of the...

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Abstract

The invention discloses an APF control method based on active disturbance rejection and repetitive control. The APF control method based on active disturbance rejection and repetitive control includes the following steps that 1, a non-linear dynamic model of an APF inverter is built according to power electronics; 2, an APF inverter controller is designed according to the non-linear dynamic model built in the step 1 and an active disturbance rejection and repetitive control combined method; 3, the dynamic response performance of a current control loop of the inverter is improved through an active disturbance rejection controller; 4, the steady response performance of the current control loop of the inverter is improved through a repetitive controller; 5, a voltage loop controller of the inverter is designed through a PI algorithm, and a reference current value needing to be tracked by the output current of the inverter is figured out. The active disturbance rejection and repetitive control combined method has the advantages that the design process is simple and engineering realization is easy, and the dynamic response performance and the steady response performance of the output tracking current of the inverter are further improved.

Description

technical field [0001] The invention relates to an active power filter control method based on self-disturbance rejection and repetitive control, belonging to the field of power system control. Background technique [0002] With the increase of diversity of power grid topology and circuit load, the impact of harmonic pollution on power grid system is becoming more and more serious and has aroused widespread concern. Harmonic pollution is not only an obstacle to the development of power electronics technology, harmonics may also cause local series resonance or parallel harmonics in the power system, thereby amplifying the harmonic content and causing equipment burnout, and harmonics will also cause damage to communication systems and electronic equipment cause serious interference. It can be seen that harmonic pollution makes the power system deviate from the ideal and normal electrical process and behavior, and the decline of power quality not only affects the safe and reli...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/20
Inventor 王建明葛乐袁晓冬李强许德智
Owner STATE GRID CORP OF CHINA
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