Method for islanding microgrid control and optimization based on rotating coordinate virtual impedance

A technology of virtual impedance and rotating coordinates, which is applied in the field of microgrid to achieve power decoupling, improve accuracy, and improve impedance characteristics
CN102623992AInactive Publication Date: 2012-08-01SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2012-08-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for islanding microgrid control and optimization based on rotating coordinate virtual impedance. Aiming to a fact that the actual microgrids have complicated impedance characteristics, the method for islanding microgrid control and optimization based on the rotating coordinate virtual impedance includes utilizing the coordinate rotation orthogonal transformation to design the coordinate rotation virtual impedance, improving the impedance characteristics of the microgrid, compensating errors of power distribution and improving power decoupling performance; establishing a complete small-signal dynamic model of the microgrid, wherein the small-signal dynamic model comprises distributed energy sources, power converters, loads and power grids, and guiding the selection of an optimal value on the basis of the small-signal dynamic analytical method; and simultaneously, providing a theoretical basis for the optimization selection of islanding microgrid control parameters by using the small-signal dynamic analytical method, wherein the islanding microgrid control parameters comprise droop control coefficients of the power distribution, process identifier (PI) parameters of a voltage current feedback controller, feedforward control coefficients and the like. The microgrid after being subjected to optimization design in an islanded operational mode is capable of effectively achieving power decoupling and improving the accuracy of the power distribution, the stability of the system and the dynamic performances.
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Description

technical field

[0001] The invention belongs to the technical field of micro-grids, and in particular relates to an island micro-grid control and optimization method based on rotating coordinate virtual impedance. Background technique

[0002] Under the dual pressure of energy demand and environmental protection, distributed energy supply technology that can not only improve the utilization rate of traditional energy but also make full use of various renewable energy sources has gained more and more attention and application. The microgrid is composed of distributed generators (Distributed Generators, DGs), energy storage devices, energy conversion devices, related loads and monitoring and protection devices, which can give full play to the technology, economy and environment that DG brings to the power system and users. It is an important part of smart grid construction to further improve the flexibility, efficiency and cleanliness of power system operation, and better meet...

Claims

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