Abstract
With a large number of distributed power connected to the grid, there are many new node types in the distribution network. The traditional power flow calculation method cannot be applied to the distribution network with multiple distributed generations. Three kinds of distributed power grid model such as synchronous machine, asynchronous machine and inverter are established, according to the characteristics of different distributed power. The P0 node model is proposed for nodes with reactive power output as active power output and terminal voltage function. To improve the condition number of Jacobian matrix included P0 node model, the optimal multiplier is introduced to correct Jacobian matrix. Through the simulation of a variety of operation mode in certain district grid, the results show that the introduction of distributed generation has effects on the process of power flow calculation. The optimal multiplier can effectively improve the ill-posed problem of power flow caused by P0 node model, and increase the fast convergence speed of power flow calculation.
Highlights
With the development of economy and the increasing capacity of power grid, the hidden danger of power supply of large power grid is becoming more and more prominent
(3), it can be seen that the reactive power output is a function of P and U, so when the asynchronous generator is grid-connected, it can be regarded as a P0 node
According to the output characteristics of distributed power generation, the P0 node model is proposed in this paper
Summary
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