A Load-Carrying Capacity Evaluation Method of Transmission Line Based on Economy and Reliability Coordination

doi:10.3969/j.issn.1000-7229.2016.06.011

Abstract

Abstract:

The power system operation is constrained by a multitude of factors， and the load-carrying capacity is relatively low if only with reliability as the criterion for evaluation. Aiming at the problem， through the analysis of the annual duration load curve， this paper proposes the maximum load-carrying capacity evaluation method of transmission line based on economy and reliability coordination. By coordinating the reliability and economy of power system， the annual average load-carrying capacity of existing lines can achieve the highest level. In the evaluation， the annual maximum load of the system meeting the reliability constraint is firstly calculated. Then the parts on duration load curve that are greater than the annual maximum are cut as overloads， and load-cutting compensation is given according to the way of interruptible load. Besides， customers also get compensation from the reserved parts on duration load curve as outage cost based on expected energy not supplied （EENS）. The growth of economic costs of reliability composed of the these two compensations are compared with the economic efficiency growth brought by electricity sale of grid， whose result shows that as long as the growth of economic costs of reliability is relatively lower， there will be still likelihood for the improvement of the maximum annual load-carrying capacity in evaluation system. The proposed method is applied in IEEE RTS 79 system， and the result shows that this evaluation method has higher results than those of traditional security assessment， which can further develop the utilization of lines and make full use of the available capacity of transmission line.Symbol`@@

Key words: power system, load-carrying capacity, reliability, economy, economic costs of reliability

CLC Number:

TM 71

SUN Tengfei， CHENG Haozhong， ZHANG Libo， ZHOU Qinyong， HE Hailei， ZENG Pingliang. A Load-Carrying Capacity Evaluation Method of Transmission Line Based on Economy and Reliability Coordination[J]. Electric Power Construction, 2016, 37(6): 70-78.

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