Capacity limitation of nuclear units in grid based on analysis of frequency regulation

Abstract

The increasing capacity of nuclear units in power grid poses threat to system stability and security. Load disturbance may cause overspeed of the units and trigger the overspeed protection controller (OPC). Repeating actions of valves have a strong impact on the security of the equipment and may result in a collapse of the power system. Based on the analysis of frequency regulation, mathematic models for nuclear units in the grid are established in this paper to simulate the dynamic process when load disturbance occurs. The critical action of the OPC is proposed as the constraint of safe operation for the units. The relationship between different styles of frequency regulation and the allowable capacity of the nuclear units in the grid is discussed. This research can help to estimate the capacity limitation of nuclear units in the grid.

Keywords

nuclear units capacity / overspeed / primary frequency control (PFC) / second frequency control (SFC)

References

[1] Dai Y P, Zhao P, Chang S P. Primary frequency control characteristic of a grid. In: Proceedings of the 3rd IEEE Conference on Industrial Electronics and Applications, Singapore, 2008, 1493–1497

[2] Younkins T D, Johnson L H. Steam turbine overspeed control and behaviour during system disturbances. IEEE Transactions on Power Apparatus and Systems, 1981, PAS-100(5): 2504–2511

[3] Kundur P, Lee D C, Bayne J P, Dandeno P L. Impact of turbine generator overspeed controls on unit performance under system disturbance conditions. IEEE Transactions on Power Apparatus and Systems,1985, PAS-104(6): 1262–1269

[4] Gao L, Dai Y P. Impact of overspeed protection control on stability for islanded power system. International Journal of Emerging Electric Power Systems, 2009, 10(6): 1–9

[5] Yu D R, Guo Y F, Xu J Y. The primary frequency regulation stability of parallel turbo-generators. Proceedings of the CSEE, 2000, 20(9): 59–63

[6] Zhang Z Y, Cai Y J. Automatic Control of Turbomachinery. Xi’an: Xi’an Jiaotong University Press, 1993

[7] Guo Y F, Xu Z Q, Yu D R, Zhao T. The design of secondary frequency regulation loop considering regulation dead band. Proceedings of the CSEE, 2004, 24(10): 77–81

RIGHTS & PERMISSIONS

Higher Education Press and Springer-Verlag Berlin Heidelberg