H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 1/00 (2007.10) H02J 3/38 (2006.01) H02M 1/08 (2006.01) H02M 7/68 (2006.01)
Patent
CA 2729463
A current controller device (43) using a vector control algorithm for controlling conversion of DC power into AC power by an inverter (27) is provided. The controller device (43) has an open loop control loop gain and comprises: - a first current demand input for receiving a first current demand signal (IQ_NET*); - al least a second current demand input for receiving a second current demand signal (ID_NET*); - a first current feedback input for receiving a first current feedback signal (IQ_NET) representing an AC current of the AC power; - a second current feedback input for receiving a second current feedback signal (ID_NET) representing an AC current of the AC power; - a first voltage feedback input for receiving a first voltage feedback signal (VQ_NET) representing an AC voltage of the AC power; - a second voltage feedback input for receiving a second voltage feedback signal (VD_NET) representing an AC voltage of the AC power; - a first voltage demand output for outputting a first voltage demand signal (VQ_NET*); - a second voltage demand output for outputting a second voltage demand signal (VD_NET*); and - a controller (43, 430) for producing said first voltage demand signal (VQ_NET*) and said second voltage demand signal (VD_NET*) on the basis of said first current demand signal (IQ_NET*), said second current demand signal (ID_NET*), said first current feedback (IQ_NET), said second current feedback (ID_NET), said first voltage feedback (VQ_NET) and said second voltage feedback (VD_NET). The open loop control loop gain depends on the frequencies contained in the first and second current feedback signals (IQ_NET, ID_NET). A first filter (65) is provided at the first current feedback input and a second filter (67) is provided at the second current feedback input. The first and second filters (65, 67) each have a filter characteristics chosen such as to reduce frequencies of the first and second current feedback signals (IQ_NET, ID_NET) at which the frequency dependent open loop control loop gain would become greater than unity and would have a phase less than or equal to minus 180°.
Brogan Paul Brian
Jones Rodney
Aktiengesellschaft Siemens
Smart & Biggar
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