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Implementation of Dual Current Controller and Realtime Power Limiting Algorithm in Grid-connected Inverter during Unbalanced Voltage Conditions  

Song Seung-Ho (전북대학교 전자정보공학부)
Kim Jeong-Jae (한국전기안전공사)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers B / v.55, no.1, 2006 , pp. 54-60 More about this Journal
Abstract
A power limiting algorithm is proposed for stable operation of grid-connected inverter in case of grid voltage unbalance considering the operation limit of inverter. During the voltage unbalance the control performance of Inverter. is degraded and the output power contains 120Hz ripple due to the negative sequence of voltage. In this paper, conventional dual sequence current controller is implemented to solve these problems using separated control of positive and negative sequence. Especially the maximum power limit which guarantees the maximum rated current of the inverter is automatically calculated as the instant grid voltage changes. As soon as the voltage recovers the proposed algorithm can return to the normal power control mode accomplishing low voltage ride through. Proposed algorithm is verifed using PSCAD/EMTDC simulations and tested experimentally at 4.4kW wind turbine simulator set-up.
Keywords
Dual Current Controller; Voltage Unbalance; Inverter Current Limit; Maximum Power;
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