Multiple Objective Programming With Distributed Power Distribution Network Considering Vulnerability

With the rapid development of the economy in the 21st century,the energy problem is becoming more and more serious,the power system power supply scale is expanding.As a new type of green power generation technology,distributed power generation can effectively avoid to bring energy consumption,environmental pollution,energy shortage,system reliability and other defects compared to the traditional energy.In recent years,more and more distributed power was supplied to distribution network,the distribution network node voltage,tributary distribution network vulnerability and so on,and the degree of their influence has a great relationship with the capacity of the distributed generation,it is necessary to analyze the security and reliability of the distribution after the distributed generation be connected.This paper introduces the objects and methods of the research on the vulnerability of distribution network,analyzes the influence of important nodes and lines on the distribution network on the critical operation state,and analyzes the necessity of considering the electrical characteristics and network topology characteristics.The application of worm algorithm in the vulnerability of distribution network is expounded from the aspects of principle and mathematical model.The mechanism of worm propagation is applied into the fault distribution of distribution network.The evaluation model of distribution network node importance based on worm algorithm is established.The vulnerability of nodes is defined,and verify the superiority of the index by using simulation examples.In this paper,the multiple objective planning of distribution network with distributed generation is studied,and the power flow calculation model of two kinds of distributed power supply of wind power generation and photovoltaic power generation is constructed.In view of the characteristics of distributed power output randomness,this paper use the semi-invariant method to calculate the power flow of the distribution network.Considering the interest of the distribution companies and users,the multiple objective planning model of distribution network with the total cost of investment operation and the vulnerability of distribution network is established in view of the economy and vulnerability.The model is optimized by using the gravitational algorithm,and the 14-node distribution network is used as an example to simulate.In comparison with other standard functions,it shows that the gravitational algorithm has good performance.The distribution network planning scheme can effectively reduce the fragility of the distribution network node,and its economy is obviously improved compared with the distributed power supply.