A Distributed Power Flow And Reactive Power Optimization Method Based On Ward Equivalent

The integrated simulation of wide area data distribution emerges as an issue with the interconnection and development of area network. While the conventional power flow and reactive power optimization methods are usually based on concentrated network data, the integrated network data simulation becomes intricate since the network power scheduling management by voltage levels and areas under various dispatching centers is hard to concentrate. This paper, by accounting for static ward equivalent method, probes into distributed power flow and reactive power optimization methods with new insights. The results are followed below.The network-based ward equivalent discrete power flow method by area is presented. The method first uses ward equivalent principles to determine the injection power and equivalent impedance of external network boundary buses. Then compute the power flow of equivalent network by Newton method with proper modification of equivalent injection power of boundary buses. The procedures are repeated with iterative equivalent Newton modification values until the integrated power flow convergence is gained. This method makes full use of Ward equivalent in revealing power, voltage and structure information of adjacent areas, which renders the power flow computation better convergence and quality. The simulation results verify the credibility of the proposed method.In light of the defeats of Ward equivalent method in reactive response, a new Ward-PV equivalent method is presented in stead of Ward equivalent, which follows the similar iterative equivalent and Newton modification procedures to simulate the integrated power flow. The results demonstrate that the Ward-PV equivalent based discrete power flow arithmetic takes on better convergence in the case of multiple system PV buses.A new discrete reactive optimization method is also proposed in combination of Ward-PV equivalent method. This method applies Ward-PV equivalent principles to determine the injection power and equivalent impedance of external network boundary buses, and then predictor-corrector primal-dual interior point method of discrete control variables to address the sub-problem of reactive optimization of equivalent network. The procedures of iterative equivalent and internal bus modification are followed to gain the convergence of distributed reactive optimization. The simulation results further verify the...