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PLL for Unbalanced Three-Phase Utility Voltage using Positive Sequence Voltage Observer  

Kim, Hyeong-Su (경북대 전기공학과)
Choi, Jong-Woo (경북대 전자전기컴퓨터학부)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.13, no.2, 2008 , pp. 145-151 More about this Journal
Abstract
This paper proposes the PLL method using positive sequence voltage which is estimated by full-order state observer to find an accurate phase angle under the condition of unbalanced utility voltage. The proposed method uses the full-order state observer instead of existing method(APF All Pass Filter) to find a positive sequence of a utility voltage and this proposed method improves transient response of an estimated phase angle when a three-phase utility voltage becomes unbalanced. To compare proposed method withexisting method, experiments have been done for a phase angle detection of utility voltage when a three-phase utility voltage becomes unbalanced. Their results show that transient state response of proposed method is improved.
Keywords
PLL(Phase Locked Loop); State observer; Unbalanced source; APF(All Pass Filter); Custom Power Devices;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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