A Power Flow Calculation Method Applicable to Microgrids in Various Operating Modes

Abstract

The invention discloses a microgrid flow model suitable for various operation modes, and a calculation method. The invention discloses a flow calculation method suitable for microgrids in various operation modes, and the method comprises the steps: forming five types of microgrid operation modes and four types of nodes according to two types of basic operation modes and three types of control strategies of a microgrid; enabling the microgrid flow calculation in five types of different operation modes to be divided into two types of flow calculation; building a unified flow model; and proposing an LM-TR (Levenberg Marquardt method combined with trust region technique, LM-TR) flow algorithm for solving. The method does not need the jacobian matrix of a flow equation to be nonsingular, has global convergence, is small in dependence on initial values of unknown variables, effectively improves the convergence of flow calculation, and can solve a problem that the convergence of flow calculation of a microgrid system is difficult because that the jacobian matrix is singular or there is no balance point. Moreover, the method can process various types of nodes conveniently, and can solve a problem of the diversity of microgrid flow calculation in different operation modes. The method is suitable for the flow calculation of the microgrid in various operation modes, and is good in engineering application value.

Description

technical field [0001] The invention relates to the field of power system analysis, in particular to a power flow calculation method applicable to micro-grids in various operating modes. Background technique [0002] Usually power flow calculation refers to deterministic conventional power flow calculation. It is the calculation of determining the steady-state operating state parameters of each part of the power system according to the given grid structure, parameters, and operating conditions of generators, loads and other components. It is the most important method for power system analysis. Basic calculations. Dynamic power flow, continuous power flow and stochastic power flow are some extensions of conventional power flow for different application requirements. [0003] Microgrid power flow calculation is an important field of microgrid technology research. In microgrid planning and design, operation research, etc., it is generally necessary to quantitatively compare t...

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Problems solved by technology

When the microgrid system has balanced nodes, its power flow calculation is similar to that of the traditional main network, and the traditional main network power flow algorithm can be used for its power flow calculation; when the microgrid system has no balanced nodes and non-traditional node types appear, the traditional main network power flow algorithm will no longer applicable

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