Abstract
By considering the static voltage characteristic of the load, we propose a WAMS/SCADA mixed nonlinear method to estimate the voltage of unobservable buses caused by topology change or phasor measurement unit (PMU) malfunction in a power system. By modeling the load characteristic with data from SCADA, we employed the Gauss-Seidel method to solve the nonlinear equations and estimate the voltage of unobservable buses with the high precision voltages of neighboring buses measured by a PMU. Simulations were carried out on the IEEE 39-bus system, and the results show that this novel method can dynamically and accurately trace the variation of the voltage phasor of the unobservable buses.
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Project supported by the National Natural Science Foundation of China (Nos. 50507018, 50595414, 50677062, and 60421002), the National Basic Research Program (973) of China (No. 2004CB21 7902), the National Key Technologies Supporting Program of China during the 11th Five-Year Plan Period (No. 2006BAA02A01), and the Key Grant Project of MOE of China (No. 305008)
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Chen, Xg., Yi, Yh., Wang, W. et al. Mixed nonlinear dynamic voltage phasor tracing method based on WAMS/SCADA. J. Zhejiang Univ. Sci. A 10, 868–876 (2009). https://doi.org/10.1631/jzus.A0820150
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DOI: https://doi.org/10.1631/jzus.A0820150
Key words
- Wide area measurement system (WAMS)
- Supervisory control and data acquisition (SCADA) system
- Observability
- Dynamic tracing
- Nonlinear equation