Research On Model Conversion Based On Meta Pattern In PSASP And PSS/E

An appropriate simulation analysis tool based on the actual system features and research purposes is essential in large power system high precision simulation, and comparison between the results of multiple software is necessary to ensure the accuracy. Research on conversion of power system simulation model can provide a favorable basis for power system planning and decision making. However, the current conversion method and the corresponding model conversion program are only for specific target software data, so that the programs are lacking in generality and applicability. Therefore, convenient and accurate conversion of multi-platform power system simulation model is an important step in data exchange between different software.Based on an actual technical project, this paper analyzes the differences and similarities between the flow model and the transient model in PSASP and PSS/E, then proposes model conversion strategy based on meta pattern considering the scalability and generality requirements for the exchange of data between multiple power system simulation platform. Hereto, the PSASP and PSS/E model conversion program is developed. The major work of this paper as follows:(1) The flow model and the transient model in PSASP and PSS/E are analyzed and compared, which including AC node type, transformer model, AC transmission line model, synchronous generator model, excitation regulator model, governor model, load model, and DFIG model. Then, the model corresponding relation and the model conversion method between the two software are given.(2) In order to realize conversion of multi-platform power system simulation model, a model transformation strategy based on meta pattern is proposed. Summarized the difference of multi-platform power system simulation model in structure and semantics, the conversion of each corresponding relationship is equivalent to a process flow. The same process flow is extracted and defined as a meta pattern with uniform specific format. Then, the meta pattern library is composed of all the conversion. Automatic conversion of model among multiple power system simulation platforms is accomplished through selecting the meta model of the library and the processing algorithm after analyzing the corresponding relationship of the model data. The corresponding relationship which can’t match any meta pattern in the database is processed by adding a new custom meta pattern and corresponding processing algorithm.(3) The PSASP and PSS/E model conversion program based on meta pattern conversion strategy is developed in C++ and Extensible Markup Language (XML).(4) The accuracy of model and parameter corresponding relation and the validity of model conversion strategy based on meta pattern are verified by the data conversion of the actual power system, the single machine infinite bus system and the CEPRI-36 system. Finally, the power flow and stability calculation results between PSASP and PSS/E are compared, and the causation of the error is analyzed.Scientific achievements of this paper are validated for the need of the project.