Các bản vẽ kỹ thuật để chế tạo là sản phẩm cuối cùng của khâu thiết kế. Chúng phải thỏa mãn hai mục đích: bao gồm đầy đủ tất cả các thông tin cần thiết để chế tạo và cũng còn là một tiêu chí kiểm soát kỹ thuật đối với các mức độ sửa chữa. Trước cuối thế kỷ 20, rất nhiều bản vẽ kỹ thuật được thực hiện bằng tay với sự trợ giúp của bảng vẽ cơ khí. Sự ra đời của máy tính với giao diện người dùng đồ họa đã có thể giúp thực hiện. | Optimal Management of Wind Intermittency in Constrained Electrical Network 139 When the wind production tends to increase the wind generator can ensure the projected exchange power to the network. Note that the storage need is lower. At the end of the day the storage level may be not equal to the initially expected level Fig. 19 dotted line . In this way the storage use plan for the next days is challenged. It is the responsibility of the wind power manager to decide whether the function plan has to be reviewed. The decision may be made in function of forecast data and the difference between the projected and real storage levels. The injected power plans of the wind generator to the network are given in the Fig. 20 in 3 cases of wind production scenarios with initially expected plan Fig. 20 fulfilled line with 30 more than expected dotted line mark . and with 30 than expected dotted line . The difference with the initial plan creates penalties. The objective function s variation is showed in the as the difference between the energy sale benefit paid by the network and the penalties. The results are given in percentage compared to the expected power. It is interesting to see that with incertitude of about 30 on the wind production the objective function would vary only about 6 . That proves the interest of the proposed optimal management method. Fig. 20. Plan of injected power to the grid 140 Wind Farm - Impact in Power System and Alternatives to Improve the Integration Fig. 21. Objective function s variation in relation to the produced wind power difference with the expected value Reactive management in real-time We are now J-Day and suppose that some disturbances occur during this day. At 5 a lack of power can be translated by an increasing penalty price for each MW that the W S system does not provided to the network from MWh to MWh . At 10 the wind production increases from MW to MW. At 3 to response to the network need to
