Design And Implementation Of Islanded Microgrid Monitoring System

Microgrid is a new structure of power grid which consists of Distributed Generation (DG), energy storage equipment, load and control system. There are two operation modes of microgrid:grid-connected mode and off-grid mode. Islanded microgrid is a special structure of microgrid, which operation mode is off-grid mode. Usually, islanded microgrid is used in remote areas, such as islands and mountainous regions. Compared with typical microgrid, the islanded microgrid has its typical characteristics:One is that the large proportion and a variety of distributed generations, such as solar power, wind power and wave power generation. The other one is that energy storage equipments are necessary, because energy storage equipments can maintain steable system voltage and keep the balance between energy storage and energy release. Technological developments in islanded microgrid have benefits on the society, economy and environment, etc.This thesis focuses on the islanded microgrid technology. Firstly, system structures of islanded microgrid are discussed. The thesis then analyzes their advantages and disadvantages, and choose suitable islanded microgrid system structure to set up a islanded microgrid system according to the project’s needs. This thesis designs Microgrid Energy Management System (MEMS) to guarante the stable running of the system, and MEMS is a hierarchical design. Top layer is distribution dispatching layer. Middle layer is centralized controllayer, the main equipments are Microgrid Controller (MC) and Microgrid Monitoring System (MMS). The bottom layer is local controller which includes Microsource Controller (MC) and Load Controller (LC).Secondly, this thesis designs algorithms for system capacity configuration and strategy for energy management. The reliability and economy are two key indicators of power grid. Stability is an important prerequisite for the power grid. Economy of power grid includes reducing system investment, resources consumption, and reducing environmental pollution. Based on load demand, this capacity configuration algorithm is used for optimizing configuration of power generation equipments, energy storage devices and inverter equipments, to ensure that the system has the better economical performance. The target of energy management strategy is to guarantee the stable running of the system, and to prolong the life of storage battery and system running time.Thirdly, this thesis detailed analyses system function requirement and completes the design of the soft. This thesis completes the debugging between microgrid controller and microgrid monitoring system at the same time.Finally, this thesis tests and analyzes the system performance. The thesis calibrates sampled data to guarantee the accuracy of data. The thesis verifies the algorithms for microgrid system capacity configuration and microgrid energy management strategy. And the thesis tests system continuous running and stability to analyze system performance. According to the test results, the strategies are effective, and the test system has stable performance.