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With the development of smart demand response (DR) technology, it provide new ideas to utilize DR technologies to participate in spinning reserve of power system. Based on smart DR technologies, this paper presents a dispatching framework with DR participating in power system's reserve in various time scales, and then a coordinated optimization model is proposed to determine how much capacity the...
Along with increasing operation of DC, the coupling degree between DC and AC power systems is more tightly and the influence with each other is more closely. It has great significance on improving the level of coordinated optimization control of power system security and stability and online auxiliary decision-making for evaluating the degree of transient stability coupling between DC and AC transmission...
In this paper, the model reference tracking control problem is presented for the discrete-time affine fuzzy systems with external disturbances. The control scheme is based on H∞ performance to eliminate the effect of disturbances below a prescribed level. Based on fuzzy Lyapunov functions, the sufficient conditions are derived in the terms of bilinear matrix inequalities (BMIs) to ensure the close-loop...
With the rapid growth of power load and the integration of large-scale renewable energies, long distance and large capacity Ultra High Voltage (UHV) transmission will be the trend of future power grid in China. Based on the background of UHV grid, and combined with advanced experiences of improving transfer capacity of power grids all over the world, especially the application of advanced techniques,...
Influenced by the energy crisis and environmental stress, wind power is growing rapidly for its mature technology and good economic returns. East China Power Grid is planning to construct million kW level wind power base in northern Jiangsu coastal areas. As one kind of intermittent energy, wind power's output changes as wind speed. When wind power is in a small proportion of total power generation,...
The artificial intelligence algorithm of the AI controller was researched, based on the DH-TSD thermally stimulated discharge apparatus developed by ourselves, and a comparison was made between the temperature rising curves of AI control and step control, the results show that the use of artificial intelligence algorithm can get a better linear for the temperature rising curve, which is conducive...
The problem of exponential P stability of neutral stochastic differential equations with discrete and distributed time verying delays is investigated. The authors gave a sufficient condition of exponential P stability by the fixed point theory rather than the Lyapunov functions. Since more general form of system is considered, this paper improves Luo Jiaowan's results.
Grid-connected photovoltaic (PV) systems are developing increasingly in recent years due to many associated economic and environmental factors and provoking control and operation problems to utilities. Most of all, it also touches the essence of management mechanism of power systems. Concerning with voltage and frequency stability, electricity quality and short-term load forecasting, the possible...
This paper is around the monitoring of soil moisture and the scale effect of the relevant research issues in arid / semi-arid areas. First of all, the surface temperature and vegetation index are inversed quantitatively using remote sensing data, and according to the distribution of vegetation index - surface temperature feature space, the soil moisture index is extracted. Then the regional soil moisture...
Based on the idea of the extended finite element method (XFEM), a new enriched displacement function, the exponent discontinuous function is presented to simulate the discontinuous character resulted from discontinuity such as crack, interface or joint. Simultaneously, for element containing the crack tip, the triangular basis function is introduced to embody singularity of the discontinuity tip....
This paper proposes a VAR regulation strategy when voltage of monitor bus fluctuates or drops severely. If voltage of monitor bus fluctuates and the CrowBar does not response, rotor side converter will change VAR output of DFIG by regulation strategy while the converter of grid side can only keep DC voltage stability. When severe grid fault occurs and CrowBar acts, rotor side converter is out of control...
This paper proposed a novel layered VAR control strategy to solve VAR and voltage stability caused by wind farm integration. The strategy first calculated reactive power demand of the wind farm by deviation of reference voltage and measured voltage of control point. Then the calculated reactive power demand was distributed by equal power factor algorithm to single wind generator in the wind farm....
Intellectual property (IP) strategy is a systematic system which includes copyright, trademark, patent and IP human resource strategy. These sub-systems are independent and also interact with each other. Nowadays, it is urgent for non-state-run scientific & technology enterprises in China to establish their IP strategy, because their products have high-technology and also easy to copy. This paper...
How to evaluate enterprise's technological innovation ability by scientific, normative and quantitative method? We all realize that this kind of evaluation method is significant to succeed in carrying on enterprise's technological innovation and establishing and keeping enterprise's competition advantage. Firstly, this paper classified enterprise's technological innovation ability into four evaluation...
This paper deals with oriented engineering application of voltage security analysis of large-scale power systems, including engineering criterion of voltage security, principal objective, and systematic procedure of voltage security assessment. A systematic approach to voltage security assessment is presented in this paper. Example of Yunnan grid voltage security analysis using systematic voltage...
The development of patent undertaking in China has kept booming since "patent law" put into enforcement 20 years ago. So it is particularly important to pay attention to the patent actual effect, improve the patent quality and value. The paper regards the revision year of "patent law" as the boundary to click, does substantial longitudinal and parallel research focusing on the...
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