Advanced Materials Research Vols. 986-987

Abstract: The objective of power system planning is to meet the requirements of the customers of the power supply bureau in a region. In addition, a good system planning is helpful to the construction, operation and power supply of a power system. Using a simulation tool is much more convenient than relying on experience or the pure analysis in theory for power system planning. In this paper a method of system planning by simulation is discussed through a certain case. Based on the results of experiments, it is shown that this is an efficient way to make a power system plan.

Abstract: This paper presents the results of a study regarding the relationship between temperature and power load of the electric power system. Weather-influenced load part is picked up from original load series data with the conclusion that the lagged effect of temperature on load is within 12 hours. Furthermore, decision tree and step regression methods are employed to get a group of decision trees and corresponding regression equations which are able to quantitatively describe the relationship between load and temperature. A short-term load forecasting algorithm is then developed and its practical implementation shows this quatitative analysis method could reliably reflect the influence of the temperature changes on the load and effectively improve the accuracy of short-term load forecasting.

Abstract: This paper proposes a reactive compensation optimization method for HVAC cables of offshore wind farms, establishing the optimization model of reactive compensation capacity of HVAC submarine cables with cable current-carrying capacity as the main constraints. The maximum transmission power and transmission distance of HVAC submarine cables are calculated, considering the constraints including power factor, line loss and reactive compensation cost. Using minimum average annual cost as the objective function compensation capacity of both cable ends and corresponding average annual cost is obtained are optimized.

Abstract: The 10kV feeder typical configuration is divided into two categories of no standby power and standby power in the paper, and subdivided into different configurations, then we use FMEA to analyze the power supply reliability of 10 kV radial lines under the different configurations, at last we compare and analyze the reliable indexes of the different equipment configuration schemes, such as the reliable rate RS-1, the system average interruption frequency AITC-1 etc. The research results show that space truss structure and switch configuration directly affect the power supply reliability of the distribution network. In the conditions of reserved auto-switch-on device and section switches automatically isolating faults, the power supply reliability rate is the highest, and the average interruption frequency and outage time are the lowest.

Abstract: In today's society, resources and energy are short. In order to promote our country to build a conservation-oriented society and to achieve sustainable development in the construction industry, the demand for modern residential energy conservation is also growing. Studying and designing of energy-efficient rural residential are one of the key work of energy-saving building. In this paper, the design of residential land use planning, building envelope, outside doors and windows, roof and interior supporting facilities are described for equitable distribution of energy-saving design in rural residential, so as to achieve the design of energy-saving rural residential purposes.

Abstract: The paper introduces the advantage of the application of new energy generation, and then describes the structure of a smart micro-grid system built on an island which includes wind, solar, tidal-wave energy system. The method of day-ahead optimal operation was applied to smart micro-grid system on the island to minimize the operation cost by using genetic algorithm. Taking actual datum of Shanghai Electric Group’s micro-grid for case study, the dynamic economic dispatch is compared with traditional dispatch strategy. The results verify the effectiveness of the dynamic economic.

Abstract: With the deepening of the electricity market reform and the development of community economy, as well as the increasing of grid scale, researching and establishing the adaptability evaluation theory and method of power grid construction not only is a realistic demand, but also has great influence on improving the evaluation theory system of power grid planning. In this paper, the adaptability evaluation content for large power grid construction consists of the adaptability of the national economy, the energy structure adaptability, grid structure adaptability and the adaptability of technology development. The paper also discusses the constructing theory and practice basis of the evaluation contents, in addition, the evaluation indexes of adaptability are presented in the paper.

Abstract: Six models of typical insulation defects are designed and lab-simulated system used for partial discharge (PD) detection of cables and accessories has been constructed to study PD characteristics of internal insulation defects in 110 kV XLPE cable system. By employing CPDM, a kind of on-line PD detector, test data of various models including related PD diagrams are obtained for our research. Based on these characteristic parameters, discharge characteristic analyses of a single PD pulse are presented and statistical operators can be obtained by numerical calculation. The experimental results show that CPDM on-line detecting method is effective for detecting PD signals from internal defects of cable accessories. In addition, there are significant differences in the some statistical parameters (e.g. discharge phase, discharge repetition rate, etc) and characteristic parameters of time-domain PD waveform which can be used as reference points for PD patterns identification in future research.

Abstract: Base on Nuclear Power Plant (NPP) participating in peak load regulation of power grid, this paper studies the operation mode of hydropower, thermal power and NPP in Combined Peak Load Regulation. The optimization model for Peaking depth of NPP was set up. The case based on actual power grid were calculated and analyzed, results of the research show that in combined peak load regulation of hydropower, thermal power and NPP, a reasonable peaking depth of NPP will effectively alleviate the peaking pressure of power grid, avoid start-stop of thermal power and abandoned water of hydropower, while ensuring the hydroelectric generating capacity in the low load periods, and ensure thermal power output smooth, it further reduce the operating costs, verify the effectiveness of the model.

Abstract: According to the pressure-state-response model, building an evaluation index system, evaluating the level of economic security of 21 coal cities by back propagation (BP) neural network theory and means of MATLAB. The results show that the level of economic security of coal cities in China is not ideal and must be improved. The level of economic security shows regional differences.