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A dynamic equivalent approach coherency-based is researched for dynamic simulation Hainan China power grid. In order to reduce the original system, the dynamic equivalent model coherency-based is established, in which the identification of coherent generators, network reduction and dynamic aggregation coherent generator parameters are included, it is two key steps of identification coherent generators...
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 flashover of contaminated insulators is the one of the key issues to threaten the safe operation of transmission line. Especially for the transmission line operated in the complicated atmospheric environment, the descending flashover characteristic of insulator would be the major factor which caused grid accidents. This paper status on ac and dc flashover characteristics of iced-covered contaminated...
Establishing regional power market and optimizing the assets allocation in regional areas are key tasks in China's power industry reformation. South China power market (SCPM) is one of the pilot regional power markets in China and started simulative operation on Nov. 21st, 2005. As the economic development and tariff level in west-east provinces is much uneven, the simulative operation result of SCPM...
There are two difficult problems should be solved during designing practicable regional transaction model, one of them is to design a rational transaction mechanism to ensure the electricity prices of different provinces in the region are relatively stable, so the balanced economic development of these provinces can be coordinated to implement the harmonious development in both power industry reform...
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...
HVDC Light has so much outstanding performance that it has been highly appreciated by power industry all over the world.After brief introduction and analysis to the principle and technique characteristics, the control modes and control system of HVDC Light, a discussion about applying HVDC Light to CSG is presented in this paper. Two models in EMTDC are proposed which illustrate the potential application...
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...
This paper has analyzed the features about the small hydropower stations in ShaoGuan. Combines with the actual situation, the optimum mathematic model is built up. Through the research and improvement on traditional genetic algorithm, the calculating method of the model based on improved genetic algorithm is presented. At last, by calculating the example with two small hydropower stations, it proves...
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...
A practical reactive power/voltage control system for regional power grid is introduced in this paper. Two-level hierarchy strategy is adopted in the control system. In the regional-level control, one day is divided into 24 time intervals, in each hour, family eugenics based on evolution (FEBE) theory is used in genetic algorithm (GA) to carry out optimization calculation. Compared with convenient...
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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