Model Merging Method Based on Fast Topology Coloring and Device Fuzzy Matching

Abstract

Model merging method is used to form a large power grid simulation model and to test dispatching system functions. A model merging method based on power grid model file that meets CIM-E standard is proposed, and fast topology coloring separates inner-grid from the whole file-based power grid model. According to edit distance, device name fuzzy matching method for different grid models is given, and then grid model merging is achieved. The simulation results demonstrate that the proposed method is available. I. INTRODUCTION The test platform (1-2) provides parallel test services for multi-dispatching, multi-version dispatching system, and supports to test one or more dispatching systems at the same time. Test platform provides initial power grid model and operation mode for the dispatching system to be tested, which is a black box for the test platform. The test platform simulates real-time operation of power grid in test process, and sets disturbances by cases. It sends power grid data and the secondary signal after the disturbance to dispatching system by simulated front in real time. The dispatching system should do data processing based on these input data, and returns various types of process data to test platform to validate the results. It needs to provide a realistic simulation environment for dispatching system to be test. The simulation model of power grid is primary problem to be solved. The test platform provides parallel test for multi-dispatching system such as state, regional, provincial and local dispatching systems. Therefore, the simulation model must cover the whole power grid models. The device information such as key ID needs to retain to interact with the simulation data and dispatching data. The upper dispatching department gathers the power grid model file from all subordinate dispatching departments, and merges these models. Reference (3) discusses model merging method from standard CIM61970, and proposes an online distributed modeling system design scheme of china southern power grid. Reference (4) studies the space-time coordinated modeling system from the standardized management, and proposes an online model merging method for D5000 system. Reference (5) updates the model connection incremental via updating the model incremental based on online model merging. However, these methods are inflexible to build model for dispatching system function test. Common power grid model (CIM-E) is mainly used as model exchange format (6), and the document includes power grid model, parameters and operation mode. The grid model files are exported from each dispatching system, which are used for model merging. It provides better convenience to build power grid simulation model. The dispatching system model is usually a part of the large simulation grid model. It needs to associate it with the large grid devices, which can obtain all needed device data from the large grid simulation data set for dispatching system test. Therefore, the matching relationship between different grid models needs to be considered while merging grid models. For the reasons above, the multi-dispatching model merging method based on CIM-E file is proposed in this paper. Firstly, the fast topology coloring (7-8) is used to separate inner-grid from the whole grid model, which is a critical technology. And then the multi-dispatching model file merging method is given. Finally, a device fuzzy matching method is put forward to achieve the device connection of EMS system and large grid model.