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The following topics are dealt with : distribution system; dispersed generation; risk assessment; power system reliability analysis; power system stability; power system control; energy access and power electronic device; power system protection; power system automation; power system economics; and critical infrastructure analysis.
The scale of medium voltage networks have been expanding and cables are increasingly used so that nowadays capacitance currents are much greater than before when single line-to-ground faults happen. And the harm of an arcing ground overvoltage is extremely severe in an ungrounded system. To solve the problem put forward, the neutral of a medium voltage network is grounded with petersen coils or low...
Single-phase Auto-reclosing (SPAR) is widely used on EHV/UHV transmission lines to improve power system reliability. However, reclosing on to a permanent fault can adversely affect the system stability and damage generators and other equipment connected to the line. To solve this problem, a new algorithm for improving the single-phase adaptive autoreclosure is presented in this paper. Firstly, primary...
In a liberalized electricity market, it is not surprising that different customers need different power quality levels with different price. So how to achieve the synthetic grading evaluation of power quality becomes a concerned problem. In this paper, the idea of classified evaluation of power quality is emphasized, and the major differences between the continuous and event-based power quality problems...
When large power supply system becomes isolated after fault occurred, the best method is finding a suitable grid-connected point to connect with external power system to maintain stable. This paper presents different connection methods on different operation conditions based on one actual power supply system. If active power in isolated system is larger than load demand, cutting-generator is adopted;...
In order to accelerate the development of renewable energies and to optimize the accommodation of the 10 GW-level Jiuquan wind power, the vision of a strong and smart grid with Gansu characteristics to accommodate large-scale wind power is articulated through the analysis of the conditions of the wind power base, the transmission grid, the DR and other related technologies. A strong EHV/UHV transmission...
This paper presents a complementary distributed generation (DG) with wind and photovoltaic powers. And it gives a detailed analysis of the effects for the various states of this DG to the island's voltage and frequency, and presents an optimization strategy called under-frequency load shedding in the island to increase the accuracy of model. On this basis, it builds a reliability analysis and calculation...
Digital based data processing and protection and control system along with digital communication networks introduces new structures for substation protection and control systems and new methods for intelligent protection and control systems. This paper presents a unique vision for the future integration of protection and control systems. Firstly, the basic concept and configuration of the developed...
Distributed generator (DG), with its flexible power generation, environment-friendly advantages has been more widely used in distribution system, which has brought some influence to the traditional distribution network reliability evaluation. In this paper, two different models for conventional DG and wind turbine generator (WTG) are established for reliability evaluation, based on different energy...
With the capacity increasing of single wind turbine and the size of wind farm, the generation reliability issues of wind farms become increasingly prominent. Compared with conventional power supply, wind power has strong stochastic volatility. Then the reliability evaluation indices for conventional supply are not suit for wind power. So it is more and more important to research and development the...
Synchronized phasor measurement based Wide Area Monitoring and Control (WAMC) system is becoming a reality within international research and development both in academia and industry. Timely and accurate data with high resolutions holds great promise for more responsible and advanced grid control and operation. Currently, most of the research focuses on the different control schemes and applications...
Cascading outage is the main cause leading to Black Out. This paper described a power system operation risk assessment method based on possibility prioritization search strategy for reducing the risk of power system cascading outage. The proposed method describe the power system cascading outage as a determinate dynamic process triggered by an occasional event, and from this point of view the risk...
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