Experimental Analysis of Stability and Power Limitations
Experimental Analysis of Stability and Power Limitations
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稳定性和功率限制的实验分析
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通讯作者：
R. C. Bergvall
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作者：
R. D. Evans;R. C. Bergvall
本文介绍了一种考虑同步调相机和负荷特性以及线路特性的确定输电系统功率和电压稳定极限的方法。用此方法计算了500英里直线输电线路的功率极限。还计算了同一条线路的功率极限，该线路在中点处具有同步调相机，将线路分为两段。在中点增加同步调相机使功率极限提高了42%。在2300伏下运行的输电系统，以实验方式确定在中点处具有同步电容器的输电线路的功率和电压稳定性极限。试验结果与计算值吻合得很好。对原动机脉动引起的振荡、线路特性和电压调节器调整进行了试验。研究发现，同步电容器上的阻尼绕组在减少振荡方面没有多大效果，特别是在谐振点处。实际上，用于启动目的的标准高电阻绕组和低电阻铜阻尼绕组之间没有区别。在高电阻和低电抗的传输线上，发现在高电容器场激励下会发生振荡。电抗的加入使系统稳定。在高压输电线路上，电抗比电阻高，预计不会因线路特性而出现振荡。
A method of determining the power and voltage stability limit of a transmission system taking into account the characteristics of the synchronous condenser and load in conjunction with the characteristics of the line is described. The power limit of a straight 500-mile transmission line is calculated by this method. The power limit is also calculated for the same line with a synchronous condenser at the mid-point which divides the line into two sections. The addition of the synchronous condenser at the mid-point increased the power limit 42 per cent. Tests were made on a 625 kv-a. transmission system operated at 2300 volts to determine experimentally the power and voltage stability limit of a transmission line with a synchronous condenser at the mid-point. The tests check closely with the calculated values. Tests on hunting caused by prime mover pulsations, line characteristics and voltage regulator adjustment were made. It was found that the damper windings on synchronous condensers do not have much effect in reducing hunting, particularly at resonant points. There was practically no difference between the standard high-resistance windings used for starting purposes and low resistance copper damper windings. On a high-resistance and low-reactance transmission line hunting was found to occur at high condenser field excitations. The addition of reactance stabilized the system. On high-voltage transmission lines the reactance is high as compared to resistance and no difficulty from hunting due to line characteristics is to be expected.