Improved projection integral algorithm based active power distribution system dynamic simulation method

Abstract

Disclosed is an improved projection integral algorithm based active power distribution system dynamic simulation method. The method includes inputting active power distribution system example power flow data, dynamic element data and fault and operation set information, setting simulation parameters, forming a total system node admittance matrix according to the system example parameters and the dynamic data, simulating initialization calculation, setting simulation time t=0 and an integral step number s=1, perform calculation in time periods of t<n> to t<n+1>, judging whether a system breaks down or is operated, judging whether the simulation time t is larger than the set time T, judging whether an integral step number s in an improved projection integral algorithm is larger than the set step number k+1, judging whether fault or operation exists in the Mh time, setting simulation time t=t+Mh, executing an external integrator correction step in the improved projection integral algorithm, and judging whether the simulation time t reaches the set simulation time T. The improved projection integral algorithm based active power distribution system dynamic simulation method is high in numerical precision, good in numerical stability, high in computational efficiency, and applicable to active power distribution system dynamic simulation with rigid features.

Description

technical field [0001] The invention relates to a dynamic simulation method of an active power distribution system. In particular, it relates to a dynamic simulation method of an active power distribution system based on an improved projection integral algorithm. Background technique [0002] The large-scale and extensive access of distributed generation (DG) and the change of system load characteristics after the implementation of demand-side response technology all bring new challenges to the planning and operation of power distribution systems. The distribution network without DG is "passive", and the power used by the connected users is provided by the upper-level transmission network. When the distribution network is connected to DG to generate bidirectional power flow, the system is called "active distribution system". ". Active power distribution system is a complex power distribution system capable of combined control of various distributed energy resources (DER, s...

AI Technical Summary

Problems solved by technology

For the explicit integration method, the amount of calculation in each time step is small, but because the numerical stability of the explicit method is poor, it can only take a small simulation step to solve the rigid problem, and the simulation speed is greatly affected. limit

Although the implicit integration method has better numerical stability and can guarantee numerical stability in the process of solving rigid problems, it needs to iteratively solve the equations at each time step. Compared with the explicit integration algorithm, its calculation and programming work is more complicated and limited. Its application in dynamic simulation of active power distribution system

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