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Research of Key Autonomous and Coordinate Control Technologies for Micro-grid Cluster

Author: GaoChunFeng
Tutor: YangRenGang
School: China Agricultural University
Course: Agricultural Electrification and Automation
Keywords: micro-grid micro-grid cluster virtual frequency states transition matrix hierarchicalcontrol IEC61850
CLC: TM727
Type: PhD thesis
Year: 2014
Downloads: 34
Quote: 0
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Abstract


Along with growth of the world’s population, increased consumption of energy, serious environmental problems and exhaustibility of fossil fuels, the development and utilization of renewable energy attracts much more attention. Micro-grid is an effective way to support distributed generation integrated into, it has become a hot topic that how to make full use of renewable energy, improve power quality and guarantee reliability of power supplement through flexible control technology. Moreover, due to distributed characteristics and permeability of micro-grid increasing gradually, how to effectively control multi-microgrids operation becomes a serious problem that needs to be solved urgently.This paper mainly studies in coordinated control of a micro-grid cluster, which involves control of a power generation unit, control of a micro-grid and control of a micro-grid cluster. The main results of this research are as follows:1) Aim at the frequency deviation problem existing in droop control of distributed generation, an improved droop control method based on virtual frequency is proposed. In this method, adjustment of phase angle is achieved by changing setting value of virtual frequency, and then can get the control coefficient of voltage phase-angle droop. Consequently, reactive power output is achieved in the condition of not changing frequency of distributed generation. Simulations results show that, compared with previous droop control method, when the same effect of power allocation is done, the proposed droop control method based on virtual frequency need not change setting value of frequency.2) Concentrate on problem existing in multiple operation states of micro-grid and multiple control modes of distributed generation, a coordinating control method based on finite-state-machine matrix is presented. The control method can provide global control and management for overall micro-grid. Also, in the condition of off-grid operation, secondary adjustment of voltage and frequency as well as power over-limit control can be achieved through partition coordination and control.3) Not only a method to define the external control characteristic indexes that a micro-grid shows in the micro-grid cluster but also a method to realize the control of external characteristic of a micro-grid are proposed. Furthermore, a three-layer coordinated control architecture of micro-grid cluster is given, which is based on the control method mentioned above. Simulations are carried out to demonstrate the applicability and rationality of the indicator and this method.4) Based on functional decomposition and integration of the micro-grid, a control information model on the grounds of IEC61850communication protocol is established, then providing a control method used this information model to achieved3-layer control of the micro-grid cluster. The information model provides basis for interoperations between different intelligent devices and makes the process of the micro-grid control standardized. Also, typical control functions are tested and proven in the paper.

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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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