Improved broadband self-adaption resonance control method for active power filter

A power filter and resonance control technology, which is applied in active power filtering, electrical components, circuit devices, etc., can solve the problems of increasing the calculation amount of the control system, and achieve the effects of saving storage space, shortening calculation time, and simple structure

CN106786639AInactive Publication Date: 2017-05-31UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-05-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an improved broadband self-adaption resonance control method for an active power filter. The method comprises the steps that the three-phase voltage of a common coupling point is collected, and a phase-locked loop is used to acquire the voltage frequency fpll and the phase theta; a harmonic detection module extracts the harmonic signal command of nonlinear load current iL; the harmonic signal command is added to an output active current command acquired through a direct current voltage controller; subtracting the command and an output current feedback signal to acquire the input error signal of a current controller; the current controller composed of a harmonic controller and a PI controller is used to acquire the output control amount; and the output control amount, the common coupling point voltage feed forward amount and the filter capacitor current feedback amount through an active damping module are added to acquire a PWM wave modulation instruction signal.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics, and more specifically relates to an improved broadband adaptive resonance control method of an active power filter. Background technique

[0002] With the rapid development of distributed generation technology, nonlinear loads have been applied on a large scale, which has also led to serious harmonic pollution problems in the power grid. In order to improve the power quality of the power grid, active power filters have been widely used. At present, the current control technology in active power filters has become a research hotspot because it can effectively improve the accuracy of harmonic current compensation.

[0003] The hysteresis controller can be used to increase the gain of the current control loop, thereby improving the accuracy of harmonic current compensation. However, the switching frequency of the hysteresis controller is variable, and the anti-interference ability is poo...

Examples

Embodiment

[0040] For the convenience of description, this embodiment takes a three-phase parallel active power filter as an example to compensate the harmonics generated by nonlinear loads, and describes the control frequency fs In the case of =10KHz, the specific method of compensating the 5th, 7th, 11th and 13th harmonic signals of the current in the grid:

[0041] In this example, if figure 1 As shown, an active power filter of the present invention improves a broadband adaptive resonance control method, comprising the following steps:

[0042] (1), collect the three-phase voltage u of the common coupling point pcc , use the phase-locked loop to lock it, and get the frequency f of the common coupling point voltage pll and phase angle θ;

[0043] (2), collecting nonlinear load current i L , carry out the abc-αβ coordinate transformation on it, and get the load current i in the static reference frame Lαβ , and then get the harmonic reference signal i of the current controller throu...