A microgrid stability control method based on bifurcation theory

A stability control and micro-grid technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve the problem that the stability control method of micro-grid cannot be well satisfied, and the energy function of high-order nonlinear state space equation is difficult to determine, etc. question

Inactive Publication Date: 2018-12-21
HUAZHONG UNIV OF SCI & TECH +3
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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problems that the microgrid stability control method in the prior art cannot satisfy the large disturbance of the microgrid and the energy function of the high-order nonlinear state space equation is difficult to determine

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  • A microgrid stability control method based on bifurcation theory
  • A microgrid stability control method based on bifurcation theory
  • A microgrid stability control method based on bifurcation theory

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[0073] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0074] A microgrid stability control method based on bifurcation theory, the method includes the following steps:

[0075] S1. According to the circuit structure and electrical relationship of the microgrid, establish the state equations of each distributed power supply, transmission line and load;

[0076] S2. Consider the frequency difference between distributed power sources and the frequency difference between distributed power sources and large power grids, and establish a unified state space equation for microgrids that considers distributed power output differences;

[0077] S3. Under the e...

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Abstract

The invention discloses a microgrid stability control method based on bifurcation theory, which comprises the following steps: according to the microgrid circuit structure and the electrical relationship, respectively establishing the state equations of each distributed power source, a transmission line and a load; by Considering the frequency difference between DGs and between DGs and large powergrids, establishing a unified state space equation of micro-grid considering the output difference of DGs; Under the unified state space equation, determining the dominant factors affecting the stability of microgrid; Based on the bifurcation theory, when the dominant factors change, enabling the equilibrium solution of stable operation state of micro-grid popular, and then determining the boundary conditions of stable operation of micro-grid. The invention accurately describes the dynamic characteristics of the system, and makes up for the deficiency that the small disturbance analysis method can only be adopted in the current research. By detecting whether the bifurcation point occurs when the parameters of the system change, the condition of stable operation of the system is determined, and the limitation of stability control method in analyzing the stability of high-order system is solved.

Description

technical field [0001] The invention belongs to the technical field of micro-grid control, and more specifically relates to a method for controlling the stability of a micro-grid based on bifurcation theory. Background technique [0002] At present, under the dual pressure of energy demand and environmental protection, distributed power generation technology using clean and renewable energy has become a research hotspot at home and abroad. Most distributed power sources have the characteristics of volatility and intermittency. To realize the access and consumption of large-scale distributed power sources, traditional control methods can no longer meet the needs of users for power reliability and safety. Power electronics The introduction of devices will aggravate the nonlinear characteristics of the distribution network, making the stability analysis of the microgrid system more difficult. [0003] The microgrid introduces a large number of power electronic devices, and the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381H02J2203/20
Inventor 晁凯云苗世洪曹新慧李娟刘子文刘昱良李忠政周二彪张三春栗磊郝佳楠
Owner HUAZHONG UNIV OF SCI & TECH
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