Microgrid power flow calculation method based on full-pure function

Abstract

The invention discloses a microgrid power flow calculation method based on a full-pure function, and the method comprises the steps: 1) constructing the full-pure function of a balance node, a PQ nodeand a PV node, and obtaining a microgrid power flow model based on a node full-pure function equation; 2) recursively solving a full-pure function equation of the microgrid node based on equivalent Maxlalin series expansion of a full-pure function to obtain coefficients of full-pure function Maxlalin series expansion of the PQ node, PV node voltage and PV node injection reactive power; and 3) constructing a solved Pade approximation formula of the unknown variable full-pure function Maxlalin series expansion of the microgrid to obtain a feasible microgrid power flow solution. According to themethod, non-iterative recursive solution is adopted, an initial value of an unknown variable does not need to be set, a Jacobian matrix does not need to be solved, whether a power flow solution exists in the system or not can be judged, a feasible solution can be solved under the condition that the power flow solution exists, a calculation result has great guiding significance in planning designand operation control of the microgrid, and the method has very high engineering application value.

Description

technical field [0001] The invention relates to the technical field of microgrid engineering for new energy power generation, in particular to a method for calculating the power flow of a microgrid based on a holomorphic function. Background technique [0002] At present, under the dual pressure of energy requirements and environmental protection, distributed power generation technologies that make full use of various new energy sources (such as solar energy, wind energy, etc.) have developed rapidly. In order to coordinate the contradiction between the main grid and the distributed generator (DG), and promote the comprehensive application of distributed generation, especially renewable energy, a reasonable and effective solution is to use a microgrid. Microgrid is a small power generation and distribution system that organically integrates DG, loads, energy storage devices, converters, and monitoring and protection devices. Power system power flow calculation is the calcul...

AI Technical Summary

Problems solved by technology

The close distance between the power source and the load in the microgrid, the access of DG, the diversity of DG types and control methods, etc., make the Jacobian matrix of the conventional power flow equation of the microgrid easy to be singular and the range of the power flow solution is narrow. The traditional distribution network is complex

In addition, in most cases, especially when the system load level is far away from its voltage collapse point, the conventional power flow algorithm converges to a feasible solution; but when the conventional power flow algorithm does not converge or converges to an infeasible solution, there will be Hard questions: Is the system truly inoperable? Or is the system feasible but the power flow algorithm cannot find a feasible solution?

Images