Title:
COMPENSATING CURRENT COMMAND VALUE CALCULATOR FOR ACTIVE FILTER
Document Type and Number:
Japanese Patent JP3261852
Kind Code:
B2
Abstract:
PURPOSE: To compensate a harmonic current in an active filter capacity by using a fundamental wave anti-phase current generated due to a load unbalance, etc., as out of an object for compensating the filter.
CONSTITUTION: An anti-phase effective component current i2p and an anti-phase reactive component current i2q of a fundamental wave anti-phase component current are respectively detected to be separated by low-pass filters 18, 18', and subtracted from a two-phase load detection current ir by matching circuits 20, 20', thereby removing the fundamental wave anti-phase component current from the current ir. Accordingly, the current ir becomes only a harmonic component current of out of an object of the filters, and three-phase compensating current command value ic* of the filter is obtained through a coordinate inverter 19' of a voltage phase reference signal 2ωt of twice frequency of a fundamental frequency of a system for returning coordinates to the original, a coordinate inverter 13' of a voltage phase reference signal ωt of the fundamental frequency and a phase converter 12'. Thus, a harmonic current can be compensated within the capacity of the filter.
Inventors:
Minoru Nishitoba
Application Number:
JP5555994A
Publication Date:
March 04, 2002
Filing Date:
March 25, 1994
Export Citation:
Assignee:
KABUSHIKI KAISHA MEIDENSHA
International Classes:
H02J3/01; H02J3/18; H02J3/26; H03H11/04; (IPC1-7): H02J3/01; H02J3/18; H02J3/26
Attorney, Agent or Firm:
Fujiya Shiga (1 person outside)
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