A Method of Error Estimation and Parameter Adaptive Adjustment Suitable for Implicit Projection Algorithm

Abstract

An error estimation and parameter adaptive adjustment method suitable for the implicit projection algorithm, which makes full use of the numerical stability characteristics of the implicit projection algorithm's numerical stability domain and its algorithm parameter M, which is basically unrelated, and is aimed at active distribution systems with rigid characteristics Stability simulation model, taking into account possible faults and switch operations during the simulation process, respectively, according to the pre-error estimation method and the post-event error estimation method, the calculation error of each projection integration step of the implicit projection algorithm is estimated beforehand and estimated afterwards , and control the simulation error of the projection algorithm through the adaptive change of the algorithm parameters, which has obvious advantages over the implicit projection algorithm with fixed parameters, and is especially suitable for large-scale active power distribution with significant multi-time scale characteristics under large disturbances The fast and accurate solution to the system stability simulation problem greatly improves the applicability of the projection integral algorithm and lays a solid foundation for the development of efficient and reliable active distribution system simulation programs.

Description

technical field [0001] The invention relates to a stability simulation method of an active power distribution system. In particular, it relates to an error estimation and parameter self-adaptive adjustment method suitable for the implicit projection algorithm, which is suitable for the stability simulation application of the active power distribution system containing a large number of distributed power sources based on the implicit projection integral algorithm. Background technique [0002] In recent years, with the widespread application of distributed generation (distributed generation, DG), energy storage, and demand-side response technologies at the power distribution level, the traditional one-way passive power distribution system is gradually transitioning And an active power distribution system with bidirectional power flow. The active power distribution system is a complex power distribution system capable of combined control of various distributed energy sources ...

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Problems solved by technology

However, since the implicit projection integration algorithm uses a fixed step size and fixed parameters for integral calculation, if a larger M value is selected for integral calculation, although the calculation efficiency of the projection algorithm will be significantly improved, when the system occurs during the simulation process such as short circuit In the fast dynamic process caused by operations or events such as faults, switch on / off, load switching on / off, etc., the fluctuations of each variable in the system per unit time are large, and the large-step integral calculation of the external integrator may produce large simulation errors and even It cannot accurately reflect the fast dynamic characteristics of the system at this time; and if a small M value is blindly adopted, when the system is in a stable operation or a slow dynamic process, the fluctuation of each variable per unit time is relatively small, which will cause many unnecessary Small step calculation process, which seriously affects the simulation calculation efficiency

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