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70年代我国生产了大量的双绕组电抗分流式励磁的小型水轮发电机组,这种励磁方式的小型水轮发电机在并网运行时遇到了无功出力不足等困难。制造厂和电站的工程技术人员曾进行过改变主副绕组之间相位、改变复励电抗器的绕组匝数等技术改造工作,但效果均不理想。本文提出的方法是利用原有电抗器的复励绕组及三相整流桥作为励磁系统的复励部分,采用简单的自动励磁调节器和单相可控整流桥构成电压校正系统,将两者在直流侧并联后供给发电机励磁。采用该方法改造现有机组具有工作量小、成本低、收效快、性能好等优点。
In the 1970s, a large number of small-sized hydro-generators with double-winding reactive shunt excitation were produced in our country. Such small-sized hydroelectric generators with excitation problems encountered difficulties such as insufficient reactive power output during grid-connected operation. The engineering and technical personnel of the manufacturing plant and the power station have carried out the technological transformation work such as changing the phase between the primary and secondary windings, changing the winding turns of the multiple-excitation reactors, and the like, but the effects are not satisfactory. The method proposed in this paper is to use the original reactor complex excitation winding and three-phase rectifier bridge as the excitation part of the excitation system, the use of simple automatic excitation regulator and single-phase controllable rectifier bridge constitutes a voltage correction system, both in the DC side of the generator excitation in parallel. The use of this method to transform the existing unit has the advantages of small workload, low cost, fast, good performance.