| At present, building medium or small hydropower plants is an important electric power development way in China. In our country, we use SCADA system(supervisory control and data acquisition) in big hydropower plants at large. But because small hydropower plants have some characteristics, for example local signals are simple, economic conditon is limit and so, the SCADA system of hydropower plant has its particularity. Taking a small hydropower plant as object, referring to inspection and control mode and computer control at porcess production of big hydropower plant, as well as sufficiently considering the course charicteristic of medium and small hydropower plants, this thesis studies basic demands, configuration and realizable methods for SCADA system of small hydropower plant. This thesis mostly introduces the job of developing application software for SCADA system of medium or small hydropower plant. Firstly fundamental principles and main functions of SCADA system are illustrated. Automation designs of medium and small hydropower plant are also prensented. Based on above sections, configuration scheme of SCADA system of medium and small hydropower plant is proposed, and then application software system of SCADA system is described in detail. Combining advanced techniques of software and network , the thesis especially elaborates collective design ideas, devoloping methods, basic structure , main function realization and characteristics of software running behind including DBMS, active picture generation system. In additon, the thesis especially elaborates load allocation among the ecnomic operation in medium or small hydropower plants. In allusion to practical instance of a small hydropower plant, analyzing and comparing different optimization arithmetics, dynamic programming arithmetics is choosed. As well, programs of the optimizationtechnology in economic operation of medium or small hydropower plants are developed, and are validated by example.
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