The Virtual Damping Control Strategy of Flexible HVDC Connecting to PMSG-Based Wind Farm for Sub-Synchronous Resonance Suppression
There exists a risk of sub-synchronous resonance when the permanent magnet synchronous motor(PMSM)based wind farm is connected to power grids through the flexible high voltage direct current(HVDC)system.Firstly,based on the establishment of the system model,root locus and modal analysis methods have been adopted to study the participation variables and participation factors of sub-synchronous resonance under V/F control mode.Secondly,in order to suppress the sub-synchronous resonance of the system,a virtual damping control strategy with different forms of high-pass filter,low-pass is proposed in the outer loop of converter station,and the selecting ranges and principle of parameters for those damping controllers are derived using analytical calculation methods.After considering the delay,the impact and laws of each damping controller on the impedance characteristics of system are studied with the impedance analysis method.Finally,the effectiveness of the proposed sub-synchronous resonance suppression strategies and the correctness of the parameters are verified by the electromagnetic transient simulation models based on MATLAB.
flexible high voltage direct currentvirtual series impedancepermanent magnet synchronous motor based wind farmsub-synchronous resonance
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