Error estimation and parameter adaptive adjusting method suitable for implicit projection algorithm

Abstract

The invention provides an error estimation and parameter adaptive adjusting method suitable for an implicit projection algorithm. The numerical stability domain of the implicit projection algorithm and the numerical stable characteristic that parameters M of the implicit projection algorithm are irrelevant basically are utilized sufficiently. The error estimation and parameter adaptive adjusting method is used for a stability simulation model of an active power distribution system with a rigid feature, events such as faults and switch operation which are possibly caused in a simulation process are considered, calculation errors of projection integration steps of the implicit projection algorithm can be subjected to prior estimation and posterior estimation respectively according to a prior error estimation method and a posterior error estimation method, and simulation errors of the projection algorithm are controlled by adaptive change of the parameters of the algorithm; compared with the implicit projection algorithm with fixed parameters, the implicit projection algorithm has obvious advantages; particularly, the problem on stability simulation of a large-sized active power distribution system with remarkable multi-time scale features can be quickly and accurately solved under the condition of large-disturbance motion; the applicability of the projection integration algorithm is greatly improved; and a firm foundation is established for development of a simulation procedure of an efficient and reliable active power distribution system.

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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