Biography
Biography: Chaoyang Jing
Abstract
China Southern Power Grid （CSG）has become the world's largest and most complex AC and DC hybrid power grid. The CSG is very complex due to HVDC, FACTS, and other high-voltage power electronic equipment operating characteristics and control strategies. Growing environmental concerns and continuing efforts to reduce dependency on fossil fuel energy resources are bringing renewable energy resources to the generation portfolio of CSG. Among the various renewable resources, wind and solar power are assumed to have the most favorable technical and economic prospects. To be effective, integration of wind and solar energy in power system operations requires a comprehensive approach to simulate the electromagnetic process in great details. The power electronic devices also greatly influence the dynamic characteristics of the grid. With the continuous advancement in power electronics, the increasing number of HVDC and renewable generations that are being built within CSG’s footprint, the need for accurate and intuitive simulation tools becomes more and more important at CSG. CSG developed an Electromagnetic Simulation Program (ESP) which includes an electromagnetic- transient hybrid simulation interface. ESP is able to complete the electromagnetic transient simulation for large scale AC and DC system with large penetration of renewable energy with fast speed and high accuracy. While ESP was being developed, CSG used PSCAD (Power Systems Computer Aided Design) to simulate electromagnetic transients and built all the models using PSCAD. This required tremendous effort. During the course of ESP development, in order to utilize all of the modeling effort asscoiated with PSCAD, an automatic conversion program (ESPCVT) was developed to automatically convert most of the PSCAD transmission model into the ESP model. The most difficult challenge of the conversion is that the PSCAD model is graphically based and the topology information of all elements is realized via the closeness of the coordinates of the element. This paper describes the PSCAD modeling methodology, how to map the PSCAD model into the ESP model, and all the conversion details. This automatic process eliminates the human errors occurring when the data is converted manually. ESPCVT was tested successfully on several systems including a real CSG electromagnetic simulation system of 1390 network nodes and 5133 network branches. Using the converted data, ESP’s simulation results agree with what is obtained using PSCAD.