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To construct the largest power simulation model with real time digital simulators (RTDS), assignment of the computing resource is an important issue to make the model feasible. For automatic computing resource assignments, the interesting idea of subgraph isomorphism is proposed. Computing units (racks) are connected with communication wires, whereas the power grid is connected with electrical lines...
A dynamic equivalent approach based on coherency is researched for dynamic simulation test in ±800 kV DC transmission project from Yunnan to Guangdong in China. To reduce the full system, the dynamic equivalent model of large-scale power system based on coherency is established, in which the identification of coherent generator groups, coherent buses reduction, aggregation coherent generator parameters...
The mechanism of UHVDC Emergency DC Power Support (EDCPS) to enhance transient stability of multi- machine system is analyzed briefly based on EEAC (Extended Equal Area Criteria), and the influence of load model characteristic including ZIP static load model and IM (Induction Motor) model on UHVDC EDCPS effect after heavy disturbance is further studied, and the corresponding UHVDC EDCPS Strategies...
The Nanpsilaao Island wind farm in Shantou power grid is taken as the object for study. First, using the actual data of the power grid and wind farm provided by Shantou power grid, with the help of the simulation and calculation tools of the PSCAD/EMTDC and MATLAB, the voltage deviation, voltage fluctuation, flicker severity, harmonics, three-phase imbalance degree are calculated based on the IEC...
The concept of state transition graph is used to analyze the cascading failure of electrical power grids in different load level. State transition graph is introduced first, then the state transition model of electrical power system DC flow is designed. The IEEE 9-bus sample system is used to show the state transition graph evolution by aggravating the load level. Some general conclusion is drawn...
Supply support in receiver system can improve the stability of the system, especial voltage stability. As the receiver system in the China Southern power grid (the CSG), Guangdong Province's load is 70% of the CSG. The voltage support should be applied to improve stability. In this paper, many operation schemes are simulated. Weak nodes are shown by the voltage sensitivity index which is affected...
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