Hybrid active power filter and its control method
A technology of power filter and source filter, applied in active power filter, harmonic reduction device, AC network to reduce harmonic/ripple, etc., can solve the problem that hybrid active power filter does not have effective output compensation current Issues such as control ability and overload suppression ability, operational safety, load change adaptability, etc.
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[0070] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0071] Such as image 3 As shown, a hybrid active power filter, which consists of an active filter 1 and a passive filter 2 in series to form a filter branch, which is connected in parallel with the nonlinear load that needs to be filtered, and it also includes grid current detection Use current detector I 3 and current detector II 4 for compensation current detection; wherein, current detector I 3 and current detector II 4 are current transformers, and the primary side of current detector I is connected in series in the grid input circuit, The secondary side is connected to the current detection unit I 1-1 in the active filter, the primary side of the current detector II is connected in series in the filter branch, and the secondary side is connected to the current detection unit II 1-1 in the active filter. 2 connections.
[0072] Such as Figure 4...
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