Algorithm Research on Parallel Topology of Large-scale Power System On-line Simulation

With the continuous expansion of calculation scale, on-line simulation analysis of large-scale power grid requires that network topology analysis is more efficient, while parallel topology is one good solution. Parallel topology of large scale power system on-line simulation calculation is studied in detail; this paper presented a parallel network topology algorithm, and this algorithm is successfully applied to large power electromechanical transient simulation in real time. According to the initial load flow, the algorithm firstly defines main power grid topology structure; the network partitioning algorithm based on optimization boundary surface is applied to put substations which include lots of switches into the corresponding sub network, then one parallel topology algorithm is realized based on multi point interface. Based on parallel electromechanical transient simulation program of power system analysis software package, in order to achieve effective integration, switching logic between topology switch shift and disconnection fault is defined. For real-time electromechanical transient simulation of large-scale power grid, this paper does not increase the complexity of the contact system in original parallel electromechanical transient algorithms, plants and substations topology analysis is distributed in the sub network in parallel. At the same time, in order to speed up the solving efficiency and power grid topology analysis, the local topology changes, admittance matrix modification technology, etc. is used in this paper. Large power system examples are tested to show that the proposed parallel topology algorithm can obtain good acceleration effect, substations operation can be simulated fast without modifying the power grid model, and the overall efficiency is basically meet the requirement of real-time simulation..