Analysis Of Power System Reactive Power Based On Power Flow Tracing

As an important part of safe and economic operation of power grid, operation and the optimal control of reactive power attracts more and more attention. Considering the locality of reactive power flow, through reactive power flow tracing, based on the dispatch of reactive power flow, proposing new methods for reactive power compensation and Partition of power system is the main work of this paper.First, based on the analysis of transmission paths of reactive flow thronging the method of power flow tracing, a method for locating and sizing reactive power compensation to reduce reactive power transmission and power system losses is proposed. Through reactive power flow tracing, the method identifies transmission paths of reactive power load and then, references the basic idea of concentric relaxation, Combines reactive power distribution with the concept of concentric layers, discusses the characteristics of transmission paths of reactive power load and reactive power layered distribution. Using the relationship between reactive power flow and branch real (reactive) power losses, defines real (reactive) power loss allocation coefficient. The locations of reactive compensation are chosen to be the buses having larger coefficients. Under certain assumptions, the expression of the coefficient to reactive load is derived, and then, the formula for optimal capacities of reactive compensation is obtained from an approximate model of power loss optimization.And then, considering the reactive flow between different nodes, analysis the coupling of the nodes, combines the theory of complex network, a method for solving the problem of partition of power system based on power flow tracing is proposed. We calculate the contribution of each source node for the injected reactive power flow of each node, define the coupling matrix between system nodes. Based on this, we propose a new algorithm for power system partition. Considering the structural features of complex network, we draw on the concept of modularity, Merge different partitions. Proposed method can solve the problem of partition of power system efficiently. At last, according to the dispatch of reactive flow, on the basis of range of generators'reactive flow, we plot the state diagram of reactive flow, and decide the partition, we guarantee the strong coupling within the region and weak coupling between different regions. Proposed method based on network topology and reactive power flow distribution, simplifies the power system, divides the system to different supply areas according to the generator power supply range, determines the system state diagram, and divided the system to several partitions according to the degree of coupling between the different supply areas.Several cases are used to analyze the validity and rationally of the proposed method.