An on Line Method of the Steady-State Data Acquisition

Abstract:

Steady-state power flow calculation belongs to power system steady-state analysis, and the data used in calculation should be steady-state data. However, the existing SCADA system hasnt distinguished the transient data from the steady-state data. The real-time measured data reflect the dynamic electric power system. It is the right reason for not all of the real-time measured power can be used for power flow calculation. In another word, it causes the matching problem between measured data and power flow calculations. Based on the current situation of information collection system, the characteristics of the measured data had been analyzed in this paper. And an effective acquisition method for steady-state measured data is proposed on the theoretical basis of the law of large numbers. It uses the average value of the measured data that in the same load state to approximate the steady-state true value in one period. And the steady-state data can be used in power flow calculation. The simulation results show that the method proposed in this paper ensures the accuracy and reliability of power flow calculation.

• Periodical: Applied Mechanics and Materials (Volumes 385-386)
• Pages: 668-674
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.385-386.668
• Online since: August 2013
• Authors: Jia Yang, Hai Bao, Ling Wang, Gang Liu
• Keywords: Average Value, Measured Data, Power Flow Calculation, Steady-State Data

References

[1] Shashi B　Patra, Joydeep Mitra, Satish J　Ranade. Micro-grid Architecture: A Reliability Constrained Approach[J]. Control System Magazine. 2005, V3: 2372-2377.

[2] F C Schweppes, E J Hands chin Proc. Static State Estimation in Electric Power System[J]. IEEE, July 1974, V62: 972-982.

[3] Wu Jiyao. Calculation method of steady-state power system analysis[M]. Shang Hai: Shang Hai Jiaotong University Press, (1992).

[4] Yu Erkeng. Power system state estimation[M]. BeiJing: Water Power Press, (1985).

[5] GB/T13729. Remote terminal equipment[S]. BeiJing: State Bureau of Technical Supervision, (2002).

[6] DL/T630. The AC sampling remote terminal technical conditions[S]. BeiJing: China Electric Power Press, (1997).

[7] IEC60870Telecontrol Equipment and System[S]. (2000).

[8] IEC61850Communication Networks and System in Substation[S]. (2004).

[9] Huang Qinglong, Ruan Hongshun. Probability Theory and Mathematical Statistics[M]. BeiJing: Peking University Press, (2005).

[10] Yang Yafei. The basis of probability and mathematical statistics[M]. BeiJing: Chemical Industry Press, (2003).

[11] Sun Yangsheng. Automatic control theory[M]. BeiJing: China Electric Power Press, (2007).

[12] DL/T860. 220kVGeneral technical specifications of the substation computer monitoring system[S]. BeiJing: China Electric Power Press, (1997).