P-Q 부하가 주어진 배전선로 두 부하점의 약식(略式) 전압계산 - Simplified Voltage-Power Formula를 이용한 배전선로의 전압계산 -

이상중; 김주철

doi:10.5207/JIEIE.2022.36.4.031

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이상중 (GangDong E&C)
김주철 (Chuncheon Campus of Korea PolytechnicⅢ)

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For a distribution power system, the load connected to a load point is represented by kVA or P+jQ form in general. The so-called two-bus V-P formula(=Voltage-Power formula) composed of bus voltages and load power P,Q and a calculation example for load voltages in a distribution line with two P-Q load points have been presented in recent publications. While the result by conventional ‘Equivalent resistance method’ is approximate, the calculation using V-P formula has yielded an exact solution. However, the original V-P formula that includes the power line loss makes the equation much complicated to obtain solutions using a scientific calculator. This paper presents a new voltage calculation using the simplified V-P formula in which the line power loss is eliminated for calculation simplicity, and illustrates an example calculation for a distribution line with two P-Q load points to compare with existing methods. Calculation result by the proposed simplified V-P formula has shown an acceptable error rate for using in the industrial fields.

#Distribution line #P-Q load #Simplified voltage-power formula #Voltage calculation