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Modeling and Simulation of Micro-grid and Operating Characteristic Analysis

Author: LiXuGuang
Tutor: LiYongLi
School: Tianjin University
Course: Proceedings of the
Keywords: Distributed Power Microgrids Inverter And network operation Island operation Operation mode switching
CLC: TM727
Type: Master's thesis
Year: 2009
Downloads: 791
Quote: 8
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Abstract


With the rapid development of industry and economy in the world, the energy crisis has unfolded before mankind. At the same time, the drawbacks or limitations of ultra-large-scale power systems is becoming increasingly apparent vulnerability of the power grid has been fully exposed, and distributed generation based on renewable energy technology has been rapid development. For the coordination of the contradiction between the large power grids and distributed power to fully tap the value and benefits of distributed energy grid and user the microgrid emerged. As an effective complement to the effective use of distributed energy grid form of micro-grid development has changed the traditional grid single supply mode, greatly improving the reliability of power supply of the electric power system and power supply efficiency. And as a link connecting distributed power grid, grid-connected inverter plays a crucial impact on distributed power and network performance. The paper analyzes the inverter-based distributed power characteristics of the distributed power control interface inverter principle, and combined with the mathematical model of the inverter in dq rotating coordinate system design PQ and V inverter / f control mode. Microgrid can run large power grid network can also be disconnected from the main network run separately in the grid failure or need. Microgrid in different operating modes to meet the power quality requirements of the load, microgrids whether reliable operation key. Traditional control ideas that distributed power with the micro-grid operation mode should be taken to a different control strategies and control the possibility of failure, apparently operating mode switch and control complexity. To solve this problem, we propose a distributed power and energy storage devices combine the form of micro-grid based on constant power control with V / f control, constant power control of distributed power PQ control, energy storage device by detecting local voltage and frequency changes in a timely manner the active and reactive power compensation. This micro-grid model can work in a networked mode can also be run in island mode, the microgrid operation mode switching without changing the micro-grid inverter control strategy. For characteristics of the DIgSILENT inverter control, the paper mentioned micro-grid model model structures and simulation, to verify its feasibility. Based on the the microgrids model structures different type of fault in a the microgrid network run microgrid transient operating characteristics of the different point of failure as well as the island operation microgrid transient stability simulation papers. For load frequently put into / excision issues, analysis and comparison of the operating characteristics of the micro grid load a different location in the state of the island operation inputs / excision. Conducting microgrid splitting simulation using the control inverter to change the power output before splitting method disturbance weakened splitting, the simulation results show that this method is effective to improve the understanding of the columns stability.

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Transmission and distribution technology > The power grid
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