论文部分内容阅读
本文分运行图的画出和运行条件改变时的运行图两部分。在前一部分里给出了在考虑饱和的条件下计算有功功率和无功功率等于常数时电枢电流和激磁电流关系曲线的公式,讨论了运行图静稳定极限的确定和静稳定极限时的无功功率和功率角的大小并画出了运行界限。在后一部分里讨论了发电机端电压的改变以及线路阻抗的存在对电机运行特性的影响。依据第一部分给出的计算公式编写出计算机计算程序用以计算运行图的曲线,并将计算结果与实验电机的实测结果相比较。在电机分析中涉及到饱和问题时常用到非线性的空载特性,以往多用图解法解决这一问题,如果用解析式近似的表示空载特性,那么就可以用计算机辅助分析,这会明显的提高计算速度和质量,并对过去因计算繁杂未能深入探讨的问题提供了解决的手段。本文是应用解析式近似逼近空载特性在电机分析中应用的一个例子。运行图能给出同步发电机与无穹大电网并联运行时的运行界限和某些运行参量之间的关系。本文的运行图具有等 P 和等 Q 两种曲线,简称为等 P 等 Q 运行图。过去的运行图没有考虑饱和并且静稳定极限是用几何作图法画出的,本文的运行图则考虑了电机的饱和影响并直接用计算结果画出静稳定极限,这使运行图能更好的接近电机的运行实际并使制图过程显著简化。本中给出的公式可用以编写计算等 P 等 Q 运行图的计算机程序,并利用计算机计算结果进行特性分析和绘制有关曲线,重点是分析了静稳定极限的确定,得出了确定静稳定极限的理论依据和具体方法。为了计算上的方便除另作说明外均采用标么制。
This article is divided into the operation diagram of the drawing and the operating conditions change when the operation of two parts. In the first part, the formulas of armature current and magnetizing current when the active power and reactive power are equal to constants under saturated condition are given. The formulas for determining the static stability limit and the static stability limit are given. Power and power angle of the size and draw the operating limits. In the latter part, the influence of the change of generator terminal voltage and the existence of line impedance on the operating characteristics of the motor is discussed. According to the formula given in the first part of the computer program written in order to calculate the curve of the running graph, and the calculation results and experimental motor compared to the measured results. In the motor analysis involves saturation problems often use the non-linear characteristics of the no-load, in the past more graphical solution to this problem, if the analytic approximation of the no-load characteristics, then you can use computer-aided analysis, which will be obvious Improve the speed and quality of computing and provide a solution to the problems that have not been thoroughly explored in the past due to complex calculations. This article is an example of application of analytical approximation to no-load characteristics in motor analysis. The diagram shows the relationship between the operating limits and certain operating parameters of a synchronous generator in parallel operation with a large dome-less power grid. This diagram has two equal P and Q curves, referred to as P and other Q-run graph. The past runs did not consider saturation and the static stability limit was plotted using the geometric mapping method. The running diagram of this paper considers the motor’s saturation effect and directly draws the static stability limit with the calculation results, which makes the running diagram better The proximity of the motor to the actual operation of the drawing process and significantly simplified. The formula given in this paper can be used to prepare a computer program such as calculating the P and Q Q diagram, and the use of computer calculations to characterize and draw the curve, focusing on the analysis of the static stability limit to determine the static stability limit The theoretical basis and specific methods. For the sake of convenience unless otherwise stated are used standard system.