The Energy Function of Grid-Following VSC with the Additional Proportional Coefficient of Kinetic Energy and Potential Energy
This paper proposes a new energy function with additional ratio coefficient of kinetic and potential energy for the transient stability analysis of grid-following converters under large disturbances,which improves the inherent conservatism of the traditional energy function.First,the form of the energy function is calculated based on the undetermined gradient method;second,with the positive definiteness of the energy function as a constraint,the range of additional coefficient is preliminarily determined;furthermore,the dissipation of the energy function is determined based on gradients and differential equations,further narrowing the range;thirdly,the stability domain of the energy function is analyzed and compared,and suggestions are proposed for improving conservatism.Finally,the conclusions obtained are applied to the electromagnetic transient simulation model of grid-connected converters,and the effectiveness is verified.
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