With the gradual increase of the proportion of new energy sources,the small disturbance stability problem caused by new power systems is becoming more and more complex.It is particularly important to study the small disturbance stability problem of the composite unit-converter scenario containing new energy and traditional energy units.In this paper,the composite unit converter power system including photovoltaic and high voltage direct current(HVDC)is studied.In this paper,a nodal mode potential energy method is proposed to analyze the power oscillation characteristics of the combined unit converter power system,and the expression of the nodal mode potential energy of the photovoltaic and HVDC grid-connected power transmission under small interference is derived.The power oscillation characteristics of the compound unit-rectifier power system are analyzed and summarized.Finally,the feasibility of this method is verified by simulation analysis and low frequency oscillation evaluation index calculation.
small signal stabilityphotovoltaiccompound unit-rectifier power systemnode mode potential energy
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