Three-phase power flow analysis method for droop control island micro-grid

A technology of three-phase power flow and analysis method, which is applied in the field of three-phase power flow analysis of droop-controlled island microgrids, which can solve the problems of difficult convergence and large amount of power flow calculation in the trust region method.

Inactive Publication Date: 2018-10-19
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a three-phase power flow analysis method of droop control type island microgrid, which solves the problem that the trust region method has a large amount of power flow calculation and is conventional in the three-phase power flow method of droop control type island microgrid existing in the prior art. Difficult Convergence Problems of Newton's Method

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  • Three-phase power flow analysis method for droop control island micro-grid
  • Three-phase power flow analysis method for droop control island micro-grid
  • Three-phase power flow analysis method for droop control island micro-grid

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Embodiment Construction

[0095] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0096] The present invention is a three-phase power flow analysis method of the droop control island microgrid, the flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0097] Step 1. Establish the three-phase model of each droop-controlled DG, load and line elements in the island microgrid and calculate the node admittance matrix Y of the system. Specifically, follow the steps below:

[0098] Step 1.1, first establish the three-phase model of the droop-controlled micro-power supply:

[0099] Let the set of all nodes in the microgrid be B, and B PQ , B PV and B DroopRepresents the collection of PQ nodes, PV nodes and Droop droop nodes in the microgrid. The three-phase voltage amplitudes of the droop nodes are equal and the waveforms are symmetrical. The droop nodes adjust the three-phase total active power of t...

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Abstract

The invention discloses a three-phase power flow analysis method for a droop control island micro-grid. The method comprises steps of: firstly establishing the three-phase models of a droop control DG, a load and a circuit element in an island micro-grid, calculating the node admittance matrix Y of a system, writing the node power balance equation of the droop control island micro-grid, and obtaining three-phase power flow equations; then deriving the modified equation of the three-phase power flow equations during the solution of a Newton method and a calculation formula of a Jacobian matrixJ; and finally calculating droop node power and branch power and outputting a power flow calculation result. The method solves the problem that the trust region method has a large calculated amount and the conventional Newton method is difficult in convergence in the three-phase power flow method for a droop control island micro-grid in the prior art.

Description

technical field [0001] The invention belongs to the technical field of power system analysis, and in particular relates to a three-phase power flow analysis method of a droop-controlled island microgrid. Background technique [0002] Power flow calculation is to determine the calculation of the steady-state operating state parameters of each part of the power system based on the given grid structure, parameters, and operating conditions of generators, loads and other components. , the basis for planning and running research. [0003] As a form of flexible and efficient utilization of distributed energy, microgrid has two forms: grid-connected and islanded. The island microgrid has two structures: master-slave control and peer-to-peer control. The microgrid with master-slave control structure has the main power supply to provide voltage and frequency support. Its operating mechanism is similar to that of the traditional power grid. In the power flow calculation, the main po...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J3/388H02J2203/20
Inventor 潘忠美刘健
Owner XIAN UNIV OF TECH
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