﻿ 一种考虑线路短时过载的断面输电能力提高方法 A Transmission Capacity Improvement Method Considering Transmission Line Short-Time Overload

Transmission and Distribution Engineering and Technology
Vol.04 No.04(2015), Article ID:16698,8 pages
10.12677/TDET.2015.44013

A Transmission Capacity Improvement Method Considering Transmission Line Short-Time Overload

Yingwei Song1, Fang Shen1, Yan Liu1, Zhuohang Wu1, Jingyi Fan2, Tingting Wang2, Anjia Mao2

1Economic and Technology Research Institute, State Grid Liaoning Electric Power Supply Co. Ltd., Shenyang Liaoning

2North China Electric Power University, Beijing

Received: Dec. 11th, 2015; accepted: Dec. 25th, 2015; published: Dec. 31st, 2015

ABSTRACT

The limit of thermal stability is an essential part of determining the transmission capacity of the transfer section. In the traditional safety analysis, the limit is a constant value. However, in the actual power operation, it is a process of the electro-thermal coordination closely relating to the environmental factors. Based on the above statements, the paper does a study on the process of the line current-carrying and then creates a model of thermodynamics of the line. After that, we combine the model with power analysis tools, as a result, forming a calculation model of power analysis. Finally, we test the thermal stability of the line in the short-time overload environment and verify the increase on the transmission capacity in consequence.

Keywords:Electro-Thermal Equilibrium, Short-Time Overload, Limit of Thermal Stability, Transmission Capacity

1国网辽宁电力有限公司经济技术研究院，辽宁 沈阳

2华北电力大学，北京

1. 引言

2. 输电线路的热平衡过程

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

Figure 1. Thermal equilibrium process of the transmission line

(10)

(11)

(12)

(13)

3. 断面短时过载能力分析

Figure 2. Diagram of the overloaded transmission line

Figure 3. Overloaded ability of transmission line

4. 解算方法

4.1. 负荷曲线的分段划分

4.2. 具体计算

Figure 4. Solution diagram of the transmission line overloaded ability

1) 设初值，在时刻，线路输送功率为，导体温度为；记在时刻，线路输送功率为，导体温度为

2) 把等分成n间隔，每一间隔为，分别标记为；相应时刻的导体温度标记为

3) 在的时间间隔内，令线路输送功率保持不变，取

4) 求解动态平衡方程(12)，变形后的积分方程(14)，得，最终可计算出时刻导体温度

(14)

(过载)阶段：

5) 记在时刻，线路输送功率为，导体温度为；若导体温度，线路满足热稳定性；若，线路不满足热稳定性。对阶段，将曲线拟合成阶梯状曲线，记在时刻，线路输送功率分别为，导体温度分别为

6) 以前面求得的为初值，求解积分式(14)，可得

7) 校验是否小于

5. 算例分析

Figure 5. Diagram of an interconnected system and its cross section

Table 1. Value of the constant in (12)

Table 2. Time interval and average load of the curve

Table 3. Conductor temperature of the transmission line at each time interval

6. 结束语

A Transmission Capacity Improvement Method Considering Transmission Line Short-Time Overload[J]. 输配电工程与技术, 2015, 04(04): 124-131. http://dx.doi.org/10.12677/TDET.2015.44013

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