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Feng Y.H.,Nanjing University of Science and Technology | Jiang Y.,Hohai University | Qiu Y.N.,Nanjing University of Science and Technology | Su D.W.,Jiangsu Electrical Power Dispatching and Control Center | And 4 more authors.
Applied Mechanics and Materials | Year: 2014

The operational performances of coastal wind farms, located at the east coast of Jiangsu Province of China, are reported in this paper. The result shows that although a rich wind resources predicted in this area, a strong variation of wind resources characteristics are observed between wind farms. Annual averaged wind speeds of five wind farms at hub height range from 4.8 to 6.6 m/s. In addition, the wind shear coefficient shows largely different although they appear to agree with coastal region characteristics. Ru Dong not only has the highest wind shear coefficient but also a largest range of wind shear coefficient variation amplitude. The Capacity Factors of the selected wind farms range from 16% to 27%. Ru Dong shows a lowest Capacity Factor of 16% which may due to the low average wind speed and high wind shear coefficient. On the contrary, Da Feng has a lower Capacity Factor with sensible wind resources indicating either an improved wind turbine technology or an optimized wind farm operational maintenance is needed to increase wind farm efficiency. The result obtained in this paper provides valuable information for future offshore wind farm development in China. © (2014) Trans Tech Publications, Switzerland. Source


Wang B.,Tsinghua University | Guo Q.,Tsinghua University | Sun H.,Tsinghua University | Li H.,Jiangsu Electrical Power Dispatching and Control Center | And 3 more authors.
Dianwang Jishu/Power System Technology | Year: 2013

To achieve the goal of bi-directional and interactive coordinated voltage control between provincial and district levels, the study is focused generation and execution of coordination strategy for bi-directional and interactive coordinated voltage control between provincial and district levels. Firstly, the method to generate the bi-directional and interactive coordination strategy between provincial and district levels is proposed, and the gateway coordination state transition diagram is designed to intuitionally express the criterion of the interaction between the AVC systems belonging to the upper and lower level systems respectively; then, the regularization method for expanded coordinated secondary voltage control suitable to provincial power network and the regularization method suitable to district power network are put forward respectively to realize mutual support between power networks in provincial level and district level. Results from simulation examples and on-site operations show that the proposed method is feasible and effective as well. Source


Jiang P.,Nanjing Southeast University | Yan D.,Nanjing Southeast University | Liu S.-S.,Jiangsu Electrical Power Dispatching and Control Center | Hu W.,Jiangsu Electrical Power Dispatching and Control Center
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

UHVDC plays an important role in Project for Delivering Electricity from the West to the East, for its flexible and quick control and large electrical capacity. Its influence on AC system is becoming larger as transferring more DC power. A method using generalized dynamic fuzzy neural network in UHVDC to increase transient stability is presented, which regulates power to supply enough damping with additional control signal. Suitable modulation signal and dimension are chosen. After GD-FNN system is trained, systematic error and ε-completeness of fuzzy rules are used as criterion for optimizing system structure. Meanwhile, degree of membership is modified to ensure that the system has a compact structure and a great generalization ability. Simulation shows that the controller designed can increase the generator's electrical damping remarkably in different conditions and suppress the oscillation effectively, so it has a certain robustness. Source


Jiang Y.,Hohai University | Jiang Y.,Jiangsu Electrical Power Dispatching and Control Center | Hu H.,Hohai University | Zhang Y.,Hohai University | And 2 more authors.
IET Conference Publications | Year: 2012

This paper proposes a method of Discrete Event System (DES) to deal with the fault section estimation problems in the bulk power system. Our approach of failure diagnosis is developing a discrete-event model of the system to be diagnosed followed by construction of the diagnoser. A clear framework is built based on the model description language of Discrete Event System (DES). Moreover, a mechanism of reasoning based on model state trajectories is introduced during the diagnosis procedure. Finally, an example is verified by the proposed method in actual power network of province Jiang Su in china. Source

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