Flow analysis system and method for intelligent power distribution networks containing distributed generation

Abstract

The invention relates to a flow analysis system and a method for intelligent power distribution networks containing distributed generation. The system comprises a detection module, an A / D conversion module, a master network analysis module, a connection module, a slave network analysis module, a keyboard and liquid crystal display module, a communication module and an upper computer. The method has the advantages of simple programming and high calculation speed; moreover, P is calculated according to the active output probability density of distributed generation, so the actual situation of distributed generation is sufficiently considered; in the process of iteration, the reactive power of nodes is adopted as a judgment basis for the condition of convergence, moreover, according to the difference of the voltages of nodes in the process of iteration, a formula is utilized to correct the reactive power of nodes, so the relation between the reactive power of distributed generation points and the voltages of nodes is fully considered, and thereby calculation is more accurate.

Description

technical field [0001] The invention belongs to the technical field of power system power flow analysis, and in particular relates to a power flow analysis device and method for an intelligent power distribution network including distributed power sources. Background technique [0002] Traditional radial distribution network power flow analysis methods are mainly divided into three types: direct method, forward-backward method and Newton-Raphson method. The direct method is also called Zbus or Ybus method, which is based on iterative calculation of node voltage. The principle of superposition is used in each iteration process. This method has a strong ability to deal with weak ring networks, and is suitable for dealing with node types with static voltage characteristics, but it cannot effectively deal with networks containing PV nodes; Alternative method is oriented to radial network with single power supply, which has the advantages of easy programming and high calculation ...

AI Technical Summary

Problems solved by technology

[0003] The existing radial smart grid power flow analysis method with distributed power generally adopts the Newton-Raphson method to calculate, but after the radial grid is added to the distributed power, the grid network structure changes, from the radial network to the weak ring network , although the traditional forward push-back substitution method cannot solve this problem, the Newton-Raphson method has higher requirements for calculating the initial value. If the initial value is not set properly, it will not only increase the number of iterations, but also affect the calculation speed. It is also possible to make the iteration diverge; there is currently another processing method, which is an improvement on the traditional push-back method, and the distributed power point is regarded as the rated output power of the generator is P, the maximum reactive power of the generator and the minimum reactive power The PQ node with the median power value of Q, this processing does not fully consider the actual situation of distributed power generation, causing the calculation results to deviate from the actual situation

Images