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At present, electric power industry is in a period of rapid development and the assessment of regional power development captures growing attention. Through the evaluation process, we can deepen the understandings of regional development ability and puts forward suggestions for the further development. However, the understanding of regional power development is still at the perceptual level now and...
The rapid growth of new energy generation in China today is presenting new challenges for the stability of power grid. Based on the mechanism of voltage-inducting cascading trips of large-scale new energy in centralized system, this paper firstly proposes the definition of trip-off path to describe the detailed process of the failure, and builds the model of trip-off path searching and risk evaluation...
Splitting control is the last defence of power system emergency control against severe disturbance. With system-level and real-time decision mode, active splitting control shows advantages over traditional splitting control. Unfortunately, searching for splitting section is a NP hard problem. In this paper, a novel active splitting strategy search method inspired by modularity-based network partition...
Automatic Generation Control (AGC) and Automatic Voltage Control (AVC) are two main control schemes in modern power grid. However, there lacks a coordination between them. Therefore, this paper puts forward a method of coordinated control of AGC and AVC by ‘simultaneous solution’. The control variables are selected as power outputs and voltage magnitude of the generators to represent AGC and AVC,...
In this paper, an online evaluation method for AGC regulation based on WAMS is proposed. Firstly, we put forwards the evaluation index system which integrates the indices in time scale and state dimension, thus make a comprehensive appraisal for AGC units. Then responding to the high sampling rate and high precision character of WAMS data, the control process of AGC regulation is divided into three...
Primary frequency regulation plays a significant role in power system frequency control. As a result of the separation of plant and grid, it becomes necessary for the grid to monitor the primary frequency performance of generators. This paper designs an online evaluation system of primary frequency regulation based on WAMS. Firstly, the evaluation indices system is proposed, which assesses the primary...
Evaluation of spatial accessibility are always the research hotspot in space planning, geography and so on. This article makes full use of two GIS-based accessibility measures including the two-step floating catchment area method and the gravity-based method to examining spatial accessibility to town and rural in Dachang County. Based on communicant and socioeconomic data of Dachang County in 2009,...
It is a hot issue of current research that how to strengthen the land use management, so that resources and environmental capacity, land development costs and industrial construction and agricultural production would be spatial balanced to promote regional sustainable development in rapid urbanization and industrialization process. A Case Study in Langfang city of Hebei province was made. Based on...
Considering the complexity of the air and space integrated weapon equipment system, a multi-level hierarchical evaluation index system based on campaign capability is proposed using a multi-level fuzzy evaluation model based on grey correlation entropy is presented. In this model, by solving the grey incidence coefficients of the evaluation indexes, the weight of each index is determined by adopting...
The model of different level's sub-chronic aluminum intoxication in chickens was established by continuous peritoneal injection different gradient aluminum trichloride (AICI3). The growth index of spleen and bursa of Fabricius were detected and the structures of them were observed by optical microscope and transmission electron microscope. The results showed that (1) the growth index of spleen and...
This paper proposes a novel patch-wise image inpainting algorithm using the image signal sparse representation over a redundant dictionary, which merits in both capabilities to deal with large holes and to preserve image details while taking less risk. Different from all existing works, we consider the problem of image inpainting from the view point of sequential incomplete signal recovery under the...
DRM is becoming more and more important for P2P live streaming. In this paper, a manageable overlay network architecture with DRM, is proposed for live streaming. The system consists of register server, index servers, supernodes and peers. The register server authorizes the peers, assign the key and index server list; The index server acts as the centralized index server to store the peer list, program...
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