Large-scale Power Grid Digital Parallel Simulation System based on Supercomputing Technology

With the most HVDC projects in operation and largest renewable energy generation capacity, State Grid has become one of the most complex power grids worldwide, which makes it difficult to simulate, analyze and control. To improve the characteristic cognition level of State Grid, more detailed simulation method such as hybrid simulation of TS and EMT is widely applied in routine operation, and meanwhile more scenarios and contingencies are considered. However, these enormously increase the computing loads, and the conventional simulation tools are too slow to support the actual daily operation. In this paper, a novel digital parallel simulation system of State Grid is proposed, which adopts supercomputing technology to deal with massive simulation cases in parallel, and then provides simulation services to remote users. The system architecture and subsystems are introduced in detail. Firstly, two levels of parallel computing are carried out to speed up the simulation, case parallelism and sub-grid parallelism. Secondly, relying on cloud simulation technology, remote access is realized to the national dispatching center and dozens of regional/provincial dispatching centers. Moreover, several key technologies of the system are explained, including TS-EMT hybrid simulation, multi-layer sub-grid parallel simulation, automatic initialization of EMT simulation, etc., which promote the system performance greatly. Since the system has been applied in State Grid to support routine operation simulation and analysis, several actual applications are introduced at the last, which demonstrates the great enhancement of power grid simulation efficiency.