微電網(wǎng)的脆弱性評估及故障后的重構(gòu)研究
[Abstract]:In recent years, the large power grid has been developing rapidly through its advantages, but the characteristics of centralized power supply lead to its increasingly obvious drawbacks, it is difficult to meet the security and reliability requirements of users. Distributed power generation technology with high efficiency and environmental protection has been developed rapidly. The research of microgrid with small capacity distributed generation has become a hot spot. Microgrid can be connected with large power grid or disconnected from the main network in the event of fault. As a complex system, the vulnerability of microgrid can not be ignored. In this paper, the current situation and main problems of vulnerability assessment and post-fault reconfiguration in microgrid are introduced, and the vulnerability and reconfiguration of micro-grid are studied. Five vulnerability indexes are established by using the analytic hierarchy process (AHP) to evaluate the microgrid from different angles such as line overload and voltage instability. On the basis of this, the index of system comprehensive vulnerability is proposed to evaluate the vulnerability of microgrid. Ant colony algorithm (ACA) is used as an optimization algorithm for microgrid reconfiguration. It has the ability of global searching and does not depend on the setting of initial parameters. Aiming at the disadvantage that the traditional algorithm can blindly select the initial solution, the updating rule of pheromone in ant colony algorithm is improved, and the searching efficiency is greatly improved. It is proposed that the system comprehensive vulnerability and the minimum network loss are taken as the objective function of micro-grid reconfiguration. The multi-objective optimization problem is transformed into single-objective optimization, which improves the efficiency of the algorithm, and obtains the microgrid reconfiguration and operation scheme. It provides a reference for the safe operation, maintenance and reconstruction of microgrid. Experimental results show that the optimal scheme of microgrid reconfiguration can be obtained accurately. Taking CERTS and the standard 33-bus model as examples, the vulnerability comprehensive evaluation index and post-fault reconfiguration of microgrid are simulated with MATLAB/SIMULINK to verify the feasibility of the evaluation method adopted in this paper.
【學(xué)位授予單位】:哈爾濱理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TM732
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