Distribution power flow calculation is the base of distribution network analysis, it is used to distribution dispatching, operation analysis, operation simulation, planning and design, also is the function that distribution reconfiguration and reactive optimization must call.
The "binary tree" is usually used in distribution network flow calculation for data structure modeling of electrical element,and the traversal technique is used to identify the layer relation of nodes in back /forward sweeping algorthm.
An improved back /forward sweeping algorithm using incidence matrix squaring instead of "binary tree" structure modeling is presented for distribution network flow calculation,which calculates the layered branches in parallel,and needs neither miscellaneous numbering of lines and nodes nor complicated data structure.
In order to solve the problems using traditional methods to calculate distribution network flow,this paper puts forward a new method to calculate distribution network flow based on graph theory. This new method avoids complicated process of matrix calculation,improves the precision of distribution network flow and gets over the problem that traditional methods can not be used in special circumstances of distribution network. The new method doesn′t have convergence problems and many calculation results.
Integrating the power flow program with the tools MATLAB simulates the transient response of the distribution networks with the direct combination wind generator under disturbances, it provides the credible rationale to the research on stability and maximal penetrable power.
In order to reduce the calculation amount of power flow in large-scale distribution networks,a method of power flow algorithm hybrid model of voltage drop model(VDM) and line losses model(LLM) is presented after analyzing VDM and LLM.
This paper proposes a new method for distribution power flow calculation.The method is based on triangular step by step method.First,a method for open loop is developed.Second,a close loop method is developed.At last,some examples are given and discussed.
Some methods for power flow calculation of distribution network presented recently are summarised. On the basis of the convergence and the selection of state variables, these power flow calculation methods are classified as 5 categories, their convergence speed and robostness are discussed.
Based on the branch exchange method,the reconfiguration of the distribution system for loss reduction is presented and the approximate loss in the network is calculated by the power flow analysis in distribution systems. An approximate formula for loss reduction by using feeder current in a single loop as the variable is given. Testing results show that the method is simple and fast.