SGRESmart Grid and Renewable Energy2151-481XScientific Research Publishing10.4236/sgre.2013.42024SGRE-32186ArticlesEarth&Environmental Sciences Engineering Design of a Monitoring System of Micro-Grid iangyangZhao1*ShiyangLiu1*School of Automation Science and Electrical Engineering, Beihang University, Beijing, China* E-mail:zhaoxiangyang@buaa.edu.cn(IZ);phoebus@asee.buaa.edu.cn(SL);270520130402198201September 10th, 2012January 10th, 2013 January 17th, 2013© Copyright 2014 by authors and Scientific Research Publishing Inc. 2014This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

This paper describes a micro-grid system and its monitoring system. This micro-grid system consists of generation systems, consumer electrical equipments, auxiliary equipments and the monitoring system. All the equipments have 485 communication interfaces. In order to monitor and manage this micro-grid system, we built a monitoring system, which contains modular instrument system and industrial personal computer. In order to keep real time, we adopt some measures in software and hardware. We adopt LABVIEW and its program modules in software and adopt modular instrument system in hardware. Supporting by the software and hardware, the micro-grid system can be safe and stable.

Micro-Grid; Real Time; The Monitoring System; Communication1. Introduction

With the rapid development of the economy and the growth of power demand, in the past few decades the China power department has paid most of the attention to the large concentrated power, coal-fired power, hydroelectric power, nuclear power, the construction of ultra high voltage and distance transmission power grids. The electric power industry has made great progress and development. With the constant expansion of power grid, the shortcomings of large scale power system are increasingly prominent. Especially in recent years, large area outages have occurred several times all around the world, and the vulnerability of electric grid has exposed.

In order to solve the problems mentioned above, the distributed power generation is put on the agenda. Distributed power generation has less pollution, higher reliability, higher efficiency, flexible installation and many other advantages.

Although the distributed power generation has a lot of advantages, there are also many problems [1]. For example, it is expensive when the distributed power single accesses the grid. Then the distributed power has some difficulties on control. The distributed power generation is an uncontrolled power supply relative to the large power grid. In order to coordinate the contradiction between the large power grid and the distributed power supply, considering the value and benefits between the distributed energy power grid and the user, scholars have put forward the concept of the micro-grid at the beginning of this century.

As an important component of the distributed power generation, the micro-grid is a necessary development trend for the future [2-5]. It can not only improve the power supply reliability, but also ease up the pressure on energy conservation and environmental protection [6-8]. This paper describes a micro-grid system and its monitoring system which manages this micro-grid system.

2. The Micro-Grid System2.1. The Composition of the Micro-Grid System

Figure 1 shows the micro-grid system which contains

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