Analysis method for the dynamic behavior of viscoelastically damped structures isstudied.A finite element model of sandwich beams with eight degrees of freedom is set upand the finite element formulation of the equati...Analysis method for the dynamic behavior of viscoelastically damped structures isstudied.A finite element model of sandwich beams with eight degrees of freedom is set upand the finite element formulation of the equations of motion is given for theviscoelastically damped structures.An iteration method for solving nonlinear eigenvalueproblems is suggested to analyze the dynamic behavior of viscoelastically damped structures.The method has been applied to the complex model analysis of a sandwich cantileverbeam with viscoelastic damping material core.展开更多
A virtual synchronous generator(VSG)can provide inertial support through renewables and energy storage.It generally operates in parallel with a diesel generator(DSG)in an islanded microgrid.However,unforeseen interact...A virtual synchronous generator(VSG)can provide inertial support through renewables and energy storage.It generally operates in parallel with a diesel generator(DSG)in an islanded microgrid.However,unforeseen interactive power oscillations occur in the paralleled system when loads fluctuate.These may also burn out the VSG owing to its low overcurrent capacity.The mechanism and suppression strategy of the power oscillation of a VSG-DSG paralleled system are investigated.It reveals that the interactive power oscillation is caused essentially by the physical difference and parameter mismatch between the VSG and DSG.Then,the elimination condition of oscillation generation is derived.Subsequently,a comprehensive suppression control strategy based on virtual inductance and dynamic mutual damping technology is proposed.Finally,the experimental results verify the effectiveness of the proposed method.展开更多
文摘Analysis method for the dynamic behavior of viscoelastically damped structures isstudied.A finite element model of sandwich beams with eight degrees of freedom is set upand the finite element formulation of the equations of motion is given for theviscoelastically damped structures.An iteration method for solving nonlinear eigenvalueproblems is suggested to analyze the dynamic behavior of viscoelastically damped structures.The method has been applied to the complex model analysis of a sandwich cantileverbeam with viscoelastic damping material core.
基金Supported by the Science and Technology Project of China Southern Power Grid(ZBKJXM20180211).
文摘A virtual synchronous generator(VSG)can provide inertial support through renewables and energy storage.It generally operates in parallel with a diesel generator(DSG)in an islanded microgrid.However,unforeseen interactive power oscillations occur in the paralleled system when loads fluctuate.These may also burn out the VSG owing to its low overcurrent capacity.The mechanism and suppression strategy of the power oscillation of a VSG-DSG paralleled system are investigated.It reveals that the interactive power oscillation is caused essentially by the physical difference and parameter mismatch between the VSG and DSG.Then,the elimination condition of oscillation generation is derived.Subsequently,a comprehensive suppression control strategy based on virtual inductance and dynamic mutual damping technology is proposed.Finally,the experimental results verify the effectiveness of the proposed method.
