Active power distribution network dynamic simulation method based on multistage optimization pursuit variational iteration method

Abstract

The invention discloses an active power distribution network dynamic simulation method based on a multistage optimization pursuit variational iteration method. The method comprises the steps offirstlycarrying out the improvement of a variational iteration algorithm in two aspects: on one hand, considering a solved approximate analytical solution at the right side of a correction functional,and onthe other hand, preferentially calculating a differential equation with higher coupled frequency such that an optimization pursuit variational iteration method with faster off-line convergence is provided,secondly, solving approximate analytical solutions corresponding to dynamic elements in a photovoltaic system and a synchronous generator system in the active power distribution network based onthe method,and then, introducing a multi-stage mechanism is introduced.An approximate analytical solution is applied to continuous time intervals, and a limited convergence domain of an original variational iteration method is broken through, so that the method can be applied to active power distribution network simulation requiring an accurate solution in a larger time span. Compared with a traditional numerical integration method, the method is higher in solving speed.

Description

technical field [0001] The invention discloses a dynamic simulation method of an active distribution network based on a multi-level optimization catch-up variation iteration method, and belongs to the technical field of power system simulation and analysis. Background technique [0002] In recent years, renewable energy is moving towards becoming a major part of the future global energy mix. The large-scale access of distributed renewable energy such as photovoltaics to the distribution network has brought changes in power flow and voltage distribution to the distribution network, making the single-source radial distribution network develop towards a multi-source active distribution network. . Distributed renewable power with a high penetration rate will bring many power system problems to the distribution network. For example, a photovoltaic power station is a highly nonlinear system, and the power it provides is random and uncertain. The distribution network brings serio...

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Problems solved by technology

[0003] However, the research work on dynamic simulation of active distribution network with high penetration distributed generation faces many technical difficulties and challenges

For the high-dimensional nonlinear system of the active distribution network, the traditional explicit and implicit integration algorithms, on the one hand, in the dynamic simulation operation, the simulation efficiency is low due to too many iterations; on the other hand, in a variety of distributed power In the computing environment of the rigid differential system of the connected active distribution network, the traditional integral algorithm needs to match the rigid characteristics with a smaller step size, so it is difficult to balance the computational efficiency and numerical stability of the dynamic simulation

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