Economic feasibility assessment of rice straw utilization for electricity generating through combustion in Thailand

The economic feasibility of biomass based combustion projects of various capacities to generate electricity from rice straw is evaluated for Thailand. For an assumed lifespan of 20 years, rice straw-fueled combustion facilities would generate Net Present Values (NPV) of −3.15, 0.94, 2.96, 9.33, and 18.79 million USD for projected 5, 8, 10, 15, and 20 MW_e plants, respectively. Examining the effects of scale on the cost of generated electricity (COE) over the considered range of capacities indicates that COE varies from 0.0676 USD/kWh at 20 MW_e to 0.0899 USD/kWh at 5 MW_e. By scaling up the power plants, the variations of the financial parameters, namely NPV values, become less sensitive to the critical variables. As an example, if the fuel price, selling price of electricity, and the plant factor change by +36% (31.0 USD/t), −16% (0.0758 USD/kWh), and −14% (5650 h/yr), respectively, the largest scale project is still appealing for investment. Nevertheless, to ensure a secure fuel supply, smaller scale power plants, i.e., 8 and 10 MW_e may be more practicable. A further sensitivity analysis is discussed in terms of the financial feasibility of the projects (i.e., NPV ? 0), and the investment appraisal condition (here, Internal Rate of Return or IRR ? 11%).     

配电自动化

概述了配电网及配电自动化的基本概念,分析了我国配电网的基本状况,认为配电自动化包括馈线自动化、用户自动化、变电站自动化和配电管理自动化,并分别介绍其内容和基本功能。最后对配电自动化有关通信问题及当前我国实施配电自动化工作提出几点建议。