Economic Operation Optimization Of Microgrid

Nowadays, power system is sustaining the pressure from both traditional fossil energy shortageand environmental pollution, which promotes the rapid development of new energy technologies(such as wind power, solar power, etc). The capacity of new energy power generation is small andsuitable to link the low voltage system as the form of distributed generator (DG), which couldprovide flexible, economical and friendly power to load. Due to differences in the characteristics ofDG significantly, the contral, stability, reliability, power quality and other aspects of traditional powersystem are facing unprecedented challenges. Microgrid solves these issues effectively. This thesisfocuses on microgrid economic optimization, and is organized as follows.1. To achieve the optimal operation of microgrid, a island optimal model with energy storage isproposed, in which the constraints of equipment operation capacity, system physical operation andpower loss are considered, such as climbing constraints, power flow constraints, state of charge andcharge or discharge current constraints, etc. Based on C++/GAMS, a microgrid system is analyzed toexhibit the effectiveness of the proposed approach, which could provide a reference for microgrideconomic scheduling containing wind, solar, storage and turbines.2. It presents a connected-grid model to achieve the optimal operation of microgrid, in which theconstraints of equipment operation capacity and system physical operation are considered, at thesame time, the influence of the uniform rice, peak valley price and spot price to the cost of microgridare discussed, making full use of interactive features between gird and microgird to reduce microgridoperation cost. Combined with the actual microgrid model and analyzed to exhibit the effectivenessof the proposed approach in C++/GAMS.3. It presents a model for microgrid optimal scheduling considering grid-connected and islanded,the microgrid optimal scheduling problem is decomposed into a grid-connected operation masterproblem and islanded operation subproblem by cut1and cut2. A T-t islanding criterion is supposed.Based on GAMS, numerical simulations demonstrate the effectiveness of proposed microgrid optimalscheduling model.The last chapter summarizes the main findings of this paper, and points out the future researchdirections.This dissertation is supported by national science and technology supportplan comprehensive interactive characters for smart grid comprehensive demonstration project.