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Generation plant efficiency is an important measure for evaluating the operating behavior of a power plant, and hence an issue of extensive concern with generation companies. On the other hand, in the deregulated electricity market environment, the change of generation efficiency before and after the restructuring is a very important index for evaluating, at least to some extent, if the restructuring...
This paper presents an energy management system (EMS) for a grid-interactive droop-controlled distributed power station, which adjust inverter output based on the power source. The control architecture consists of two levels of hierarchy: (1) the P/Q droop control method of every inverter which can manage the output power of each unit in order to avoid critical communication lines; (2) the management...
Ocean energy generation is a project of great potential on renewable energy at inshore areas. It could not only alleviate the press of power energy at these relative-developed areas, but also give the promotion of sustainable development for environment. Great attention has been given by many countries. This paper analyzes the necessity of the development of ocean energy generation with the world's...
Photovoltaic (PV) generation system is an intermittent power source in traditional power grid. With its capacity expanding, PV power station (PS) affects the power grid more and more obviously. In this paper, stochastic chance-constrained programming of large-scale (LS) grid-connected (GC) PVPS's capacity limit is studied in detail. The problem is represented as a planning model which maximizes total...
Small hydro (SH) / photovoltaic (PV) hybrid power system (HPS) is a clean and economic way of renewable energy power generation, which has a good complementary according to local resources distribution features. Operation characteristics of SH and PV generation system are analyzed in detail and a novel control strategy is proposed in this paper. The PV generation system is designed to have the same...
Protection setting calculation and data management for main equipment in power plant is an important technical foundation for the work. Relay devices of main equipment protection have no uniform criterion and the style of each corporation is distinctive. The setting is time-consuming and laborious with heavy workload. Aiming at the current practical situation, this paper describes the design scheme,...
As a major equipment in large pumped storage power stations (PSPS), static frequency converter (SFC) is very important for the fast start of large-sized pumped storage sets and the stable operation of PSPS. This paper presents a multi-degree of freedom dynamic control algorithm for 10MW-Class static frequency converter (SFC) of the large-sized pumped storage power stations (PSPS). This control method...
Energy shortage has seriously hindered the economic development in many countries. The energy conservation and waste heat recovery are paid more attention recently, especially in developing countries, where the energy utilization efficiency is often neglected for accelerating development before energy price is rapidly rising up. In China, the metallurgy industry, cement industry, ceramic industry,...
In this paper we present an alternative power supply evaluation model to determine the optimal type of power supply from a sustainable development perspective. The analytic hierarchy process is applied to decide the priority of different types of power supply. The results of the study indicate the gap between goals of sustainable development and current power supply structure in terms of energy security...
The contradiction between industrialization and the environmental protection as well as the energy saving has become the main restriction to the economic development of many countries in the world. In order to achieve the goal of sustainable development, it is a crucial strategy to greatly promote the actions about energy saving and emission reduction in coal-fired power plants. This paper just focuses...
Utilizing multi energy sources synthetically and efficiently based on the system integration is one of the trends of energy science recently. In this study, from the view of the second law of the thermodynamics, we calculate the exergy efficiency of the LS-2-parabolic trough collector, get the exergy efficiency curve in various outlet temperatures and acquire the optimal operating temperature of the...
Ni/γ-Al2O3-550 and Ni/γ-Al2O3-800 catalysts (calcined at 550°C and 800°C in the catalyst preparation) were prepared with a impregnation method. Steam reforming of acetic acid as a model compound of bio-oil for hydrogen production had been investigated on the catalysts. The fresh catalysts were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR-H2) and specific surface...
Water source heat pump is the device which can transform low level heat energy to high level heat energy. It suits to using in thermal power plants, and can effectively make use of the waste heat of circulating water and flue gas, consequently the loss of heat could be reduced and the efficiency of coal could be increased, it has the prominent benefit of energy-saving and environmental protection...
Solar energy is considered as one of the most effective, less expensive, harmless and less environment pollution effect of renewable energy sources. The problem of using solar power including varying weather condition brings different output power of the photovoltaic (PV) array, which may cause a serious waste of solar power. For solving this problem, a Maximum power point tracking (MPPT) strategy...
From the stand point of sustainable development as well as energy security, there is a need to generate power in an environmentally friendly manner using renewable energy sources. However, practical problems occur when considering portable installations in urban as well as rural settings. A specific example may be where due to logistical reasons, only very lightweight photovoltaic modules can be installed...
In this paper, wind speed and the power generated are predicted using phase space reconstruction and artificial neural network (ANN) method. First of all, data of wind speed is preprocessed with theory of phase space reconstruction to obtain the optimal length of time series for forecasting. And then, RBF artificial neural network is used to forecast the wind speed. Finally, the output power of a...
Because of the intermittence of wind resource, as well as electricity quantity is determined by the local wind resource, it is difficult to compare the economic operation situations of wind farms of different wind resource and other conditions. Evaluation Indexes of economic operation for wind farms were discussed according to actual operation and monitoring situations of wind farms, as well as influencing...
Intermittent renewable energy sources such as wind power, solar power and wave power are highly variable output. Theses energy sources are most of the time not load following. Consequently, renewable energy has limited contribution in power generation and it is difficult to be controlled. It is often stated that, this problem of intermittent renewable can be solved by integration with energy storage...
Coal-fired power plants are the main pollution source in most parts of China. The implementation of cleaner production in coal-fired power plants is necessary for environmental protection and also an effective way of energy saving and emission reduction. This paper reviews the researches of cleaner production of coal-fired power plants in China and makes a survey on major studies of cleaner production...
The study state of solid oxide fuel cell (SOFC) and hybrid power system in the developed country was investigated in this work. The comparison of various SOFCs and hybrid power systems in different countries is helpful for the development of SOFC. In addition, the effect of the cell structures on the performance of planar SOFC was studied. The performance of single cell with different shapes and different...
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