Event-Triggered Based Sub-Synchronous Supplementary Damping Control Method of DFIG

doi:10.3969/j.issn.1000-7229.2017.09.015

Abstract

Abstract: ABSTRACT： To fast and accurately estimate, and effectively mitigate sub-synchronous control interaction （SSCI） problems which occurs when the doubly-fed induction generator （DFIG） is connected to series compensation transmission system, this paper firstly analyzes the function path of SSCI and presents its occurrence criterion through the mathematical deduction. Then, based on this criterion, this paper puts forward a SSCI event-triggered based sub-synchronous supplementary damping control strategy of DFIG, and proposes the sub-synchronous frequency extraction method for rapid detection demand； adds hysteresis link to solve the misjudgment problems caused by generator parameter uncertainty and improve the robustness of the method； designs a band- pass filter for smoothing phase-frequency characteristics and improves the applicability of the control method to frequency varying SSCI problems. Finally, the simulation results from PSCAD/EMTDC indicate that the proposed control method still has good damping ability for SSCI when the wind speed or the series compensation degree changes, and even when the generator parameters are inaccurate. At the same time, when there is no SSCI risk, the supplementary damping control will quit operation according to the introduced SSCI event judging mechanism, so it will not influence the main control function of the DFIG inverter. Compared with the existing supplementary damping control methods, the proposed method still has better mitigation effect with higher compensation level.

Key words: double fed induction generator（DFIG）, series compensation transmission system, sub-synchronous control interaction（SSCI）, event-triggered, supplementary damping control

CLC Number:

TM 732

CAO Chengsha, XIAO Xiangning, ZHANG Jian. Event-Triggered Based Sub-Synchronous Supplementary Damping Control Method of DFIG [J]. Electric Power Construction, 2017, 38(9): 103-.

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