Đang chuẩn bị liên kết để tải về tài liệu:
Applications of High Tc Superconductivity Part 5

Tham khảo tài liệu 'applications of high tc superconductivity part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Superconductivity Application in Power System 69 Fig. 27. IEEE 39 bus systems HTS cable application red line SI calculation of sample system To consider power system reliability N-1 contingency criteria was applied. Equation 3.1 and 3.2 shows the severity index SI over load index and voltage index used in ranking. Over-load index Equation 3.1 represents over-load index. L f P Ì PI E P 41 P .1 i 1 max i y 10 Voltage index Consumption of reactive power can be known by voltage ranker which represents increment of reactive power loss by increased load factor of line. Equation 3.2 represents voltage index. L PI E xiPi2 i 1 11 where Pi is active power Xi reactance and Pmax i power ratings of i-line. The results of SI on sample system results are shown in Table 3.4 and Table 3.5. As a result of calculation the first two contingency cases of each SI are determined as the object cases of voltage stability calculation. 70 Applications of High-Tc Superconductivity a before b after Fig. 28. P-V curve HTS cable application Superconductivity Application in Power System 71 Ranking No. Contingency Line PI p.u. From Bus To Bus 1 21 22 10.8136- 2 23 24 8.6842 3 6 11 8.6463 4 13 14 8.6206 5 15 16 8.5228 Table 8. Performance index by line overload index Ranking No. Contingency Line PI p.u. From Bus To Bus 1 28 29 10.8884 2 2 3 10.3888 3 16 21 10.2108 4 2 25 9.9931 5 6 7 9.8334 Table 9. Performance index by line voltage index of case I Table 10 is the summary of the overloaded lines at severe contingency cases. HTS cable is applied as the order of severity of overloaded line. The replaced system is shown as Fig.29. Considered HTS cable constants are L 0.10 uH km C 0.29 uF km respectly. Incremented transfer capacity after HTS cable replacement is 8 880MW in base case and 5720MW in N-1 contingency case. Therefore increased transfer capacity becomes 1820MW. from to contingency rating flow overload 16 24 OVRLOD 1 600.0 630.4 105.0 22 23 OVRLOD 1 600.0 665.5 107.9 23 24 OVRLOD 1 600.0 945.9