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Negative-sequence voltage elimination for distributed generators in grid-feeding operation mode

Abstract:

A major concern of the power quality in distributed systems is related to the mitigation of voltage imbalances. Thisfunction can be implemented directly in the control system of the distributed generation power converters workingsimultaneously with the standard operation modes. This study presents a negative-sequence voltage elimination technique fordistributed generators in grid-feeding operation mode. The proposal guarantees a complete elimination of the negativesequence voltage, while operating without a priori in-depth knowledge of the grid configuration and its characteristics. Theproposed control architecture is presented together with its pseudocode, a controller flowchart and a discussion of theimplementation aspects. A closed-loop modelling is derived based on a complex transfer function approach, which is used todetermine stability margins and control design guidelines. A laboratory setup was implemented to verify the performance of theproposed strategy.