A Novel Method for Solving the Divergence of Power Flow and Controlling Voltage in Integrated Distributed Generators Network

摘要

In this paper, a new method for solving the divergence of power flow is proposed. The salient feature of the new method is that instead of focusing on computation techniques as in prevalent methods, physical conditions of networks are changed to overcome problem of divergence, i.e. reallocating reactive power compensations. Since incongruous distribution of reactive power may lead to divergence of load flow, switched shunts are controlled to re-appropriate reactive power in power systems. As a result, mismatch decreases over iterations of Newton-Raphson method and power flow quickly converges. The most important contribution of the proposed method is ability to prevent voltage collapse. Numerical test on a large scale electric power system is analyzed. Moreover, an approach to derive a simple formula to control voltage at some heavy load bus is presented. The reactive power source used in this research is the distributed generator which is adjacent to the heavy load. Linearizing the power network using Power Transfer Distribution Factors is a simple method with accepted errors. A new value of voltage at the distributed generator terminal is computed in terms of the voltage deviation of load buses. In this approach, solving the entire system is unnecessary.