Effect of Load Change on the Thevenin Equivalent Impedance of Power System

Tiankui Sun, Zhimin Li, Shuang Rong, Jian Lu and Weixing Li
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Tiankui Sun: Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China
Zhimin Li: Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China
Shuang Rong: Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China
Jian Lu: Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27606, USA
Weixing Li: Department of Electrical Engineering, Harbin Institute of Technology, 150001 Harbin, China

Energies, 2017, vol. 10, issue 3, 1-6

Abstract: This paper discusses the effect of load change on the Thevenin equivalent impedance of power systems. In this paper, the Thevenin equivalent impedance influenced by the derivative of active load with respect to reactive load (dP dQ) is analyzed. The Thevenin equivalent impedance forms a closed curve in a complex plane and shrinks to one point when voltage collapses. The magnitude of the Thevenin equivalent impedance at the collapse point is equal to the magnitude of the load impedance. Therefore, the impedance match theory still holds under the effect of the load change. These features are verified on a New England 39-bus system.

Keywords: power systems; Thevenin equivalent impedance; load change; impedance match theory (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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