PSCADA-based Urban Rail Transit Power Supply System Simulation

With the rapid development of urban rail transit construction,rail transit in many cities in China has initially met the conditions for networked operation.The network of the urban rail transit power supply system is deepened,and the power supply network is stronger and stronger.Power supply simulation is an important analysis method of the power supply system.The deepening of the complexity of the power supply system has higher requirements for the power supply simulation.However,most existing urban rail transit power supply simulation tools mostly use graphic element modeling and offline calculation methods.A lot of simplification of the real power supply system,and the system runs on the Windows platform,the calculation speed is relatively slow and other issues.To this end,with the support of the enterprise-level project "Development of Algorithmic Package for Traction Power Supply Calculation Algorithm for Rail Transit",through the cooperation with Nanjing NARI-Relays Jibao Electric Co.,Ltd.,an algorithm package for urban rail transit power supply calculation was developed.The system model and switch measurement status in the PSCADA system are used as input conditions for power flow calculation,and the power flow distribution can be adjusted by changing the power supply system cross section.The main work of this article is as follows.(1)It is proposed to extract the model data of the power supply system from the graphics management system of the PSCADA system,complete the conversion of graphics to data by using the integrated technology of graph model library,and extract the measurement data from the database management system of the PSCADA system.The application functions that can be developed based on the power supply simulation of the PSCADA system are designed.(2)On the basis of clarifying the specific meaning of each CIM package,it is determined to take the three packages of Core,Topology and Wires as the main content,and draw on the expansion principles and methods of the power system CIM to expand the equipment in the Wires package and adopt CIM / XML format documents indicate that CIM modeling of urban rail transit power supply system is realized by importing and exporting CIM / XML format documents.(3)After establishing the CIM model of the urban rail transit power supply system,conduct a topology analysis of the power supply system.Firstly,the commonly used topological analysis methods of power system are introduced,and then combined with the characteristics of urban rail transit power supply system,the representation method of power supply system measurement file is given.On this basis,a topology analysis method considering the operation status of substation is proposed.(4)According to the network topology results,the alternating current and alternating power supply algorithm is used to solve the power flow distribution of the power supply system,and the DC steady-state short-circuit current calculation algorithm is used to solve the short-circuit current.(5)Develop the calculation algorithm package of urban rail transit power supply,in the form of dynamic link library,as an independent plug-in embedded in PSCADA system,can achieve "plug and play".