Parallel type quasi-proportional resonance active power filter and control method thereof

Abstract

The invention provides a parallel type quasi-proportional resonance active power filter and a control method thereof, for tracking a line frequency more accurately, solving the problem that floating track to alternating quantity by PI track cannot be achieved, and thus improving the filter performance of the active power filter. The control method of the parallel type quasi-proportional resonance active power filter comprises the following steps: 1, enabling obtained power grid voltage signals to be subjected to software phase-locked loop to real-time monitor the frequency of the power grid, and thus obtaining a phase angle of A phase positive sequence voltage; 2, real-time modifying resonance angular frequency being subjected to the control of quasi-proportional resonance, so as to enable the resonance angular frequency of the quasi-proportional resonance to always keep fixed proportional relation with the power grid frequency; 3, according to a real-time modified resonance angular frequency and an obtained load current signal, performing quasi-proportional resonance control to take out the reference current of a selected filtering frequency; 4, performing quasi-proportional resonance control to difference of the output reference current and actual output current of the active power filter, outputting a drive signal to drive the connection of IGBT (Insulated Gate Bipolar Transistor).

Description

technical field [0001] The invention relates to the technical field of active power filters, in particular to a parallel quasi-proportional resonant active power filter and a control method. Background technique [0002] Since the 1970s, the power electronic equipment with a large number of nonlinear loads in the power grid has been increasing, resulting in serious harmonic pollution of the power grid. This is mainly due to the non-linear, impact and unbalanced power consumption characteristics of these loads. Therefore, the active power filter technology for harmonic suppression has become one of the research hotspots in the field of power electronics and electrotechnical. Active power filter (APF: Active power filter) is a new type of power electronic device used to dynamically suppress harmonics and compensate reactive power. It can quickly track and compensate harmonics of different sizes and frequencies, so it is called Active, compared to the passive LC filter, which...

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention proposes a parallel quasi-proportional resonant active power filter and a control method to achieve more accurate tracking of the grid frequency and solve the problem that PI tracking cannot achieve static-difference tracking of AC volume , to improve the filtering performance of the active power filter

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