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1. (WO2015124221) METHOD FOR OPERATING AN INVERTER WITH REACTIVE POWER CAPABILITY HAVING A POLARITY REVERSER, AND INVERTER WITH REACTIVE POWER CAPABILITY HAVING A POLARITY REVERSER

Pub. No.:    WO/2015/124221    International Application No.:    PCT/EP2014/068771
Publication Date: Fri Aug 28 01:59:59 CEST 2015 International Filing Date: Thu Sep 04 01:59:59 CEST 2014
IPC: H02J 3/38
H02M 7/48
H02M 1/44
Applicants: SMA SOLAR TECHNOLOGY AG
Inventors: FRIEBE, Jens
PRIOR, Oliver
Title: METHOD FOR OPERATING AN INVERTER WITH REACTIVE POWER CAPABILITY HAVING A POLARITY REVERSER, AND INVERTER WITH REACTIVE POWER CAPABILITY HAVING A POLARITY REVERSER
Abstract:
During the operation of an inverter (1) with reactive power capability having a voltage intermediate circuit (7) and a polarity reverser (17), wherein poles (8, 9) of the voltage intermediate circuit (7) can be connected to connections (18, 19) of an AC output (20) in different configurations by means of the polarity reverser (17) in order to change a polarity of the AC output (20) in comparison with the voltage intermediate circuit (7), the direction of a current flowing via the voltage intermediate circuit (7) is reversed in the event of a phase shift between alternating current (I) and alternating voltage (U) at the AC output (20). This reversal of the direction of the current flowing via the voltage intermediate circuit (7) involves the AC output (20) being isolated from the voltage intermediate circuit (7), a freewheeling path being provided between the connections (18, 19) of the AC output (20) while the AC output (20) is isolated from the voltage intermediate circuit (7), and the AC output (20) being connected to the voltage intermediate circuit (7) again when the polarity of the AC output (20) has been changed by the polarity reverser (17) in comparison with the voltage intermediate circuit (7).