Positive Feedforward Control of Three-Phase Voltage Source Inverter for DC Input Bus Stabilization With Experimental Validation

A positive feedforward (PFF) controller is proposed as a new active approach to improve stability of a three-phase voltage source inverter. In particular, the proposed approach solves the source subsystem interaction problem, i.e., a system stability degradation which is commonly observed when the i...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2013-01, Vol.49 (1), p.168-177
Main Authors: Riccobono, A., Santi, E.
Format: Article
Language:English
Subjects:
Constant power load
Frequency control
g-parameter representation
Impedance
Inverters
multi-converter system
negative incremental impedance
passivity
positive feedforward control
Power system stability
stability
Stability criteria
subsystem interaction
Voltage control
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Summary:A positive feedforward (PFF) controller is proposed as a new active approach to improve stability of a three-phase voltage source inverter. In particular, the proposed approach solves the source subsystem interaction problem, i.e., a system stability degradation which is commonly observed when the inverter is connected to a dc voltage source subsystem that presents finite Thévenin impedance. The implemented strategy is to combine the PFF control with the conventional negative feedback (NFB) control. When properly designed, the PFF control modifies the inverter input impedance in the frequency range where the subsystem interaction occurs. As a result, the PFF control stabilizes the dc bus voltage ensuring overall system stability, while allowing the NFB control to maintain good output voltage regulation performance. The approach results in greatly improved stability and damping of the dc bus voltage with a slight reduction of output FB control bandwidth. Complete small-signal models are presented on a dq rotating frame using g-parameter representation. The design criteria for the PFF controller as well as the tradeoff between dynamic output performance and stability improvement are discussed in detail. An extended analysis of stability based on minor loop gain and passivity concept at the dc input bus is also presented. The approach is validated by experimental results.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2012.2229686