发电机工况参数模型及进相运行在线监测

随着电网容量的增大、电压等级的提高,电力系统低谷运行时枢纽点电压偏高的问题日益突出。利用发电机进相运行方式做为一种调压手段,因无需增加任何设备,有其简单易行、安全经济的特点,尤其是具有可连续调节的独特优点,而逐渐得到应用。但在采用该方式时,必须科学地确定其进相运行能力,提供有效的在线监测手段,以确保进相运行方式下的安全运行。传统的数学模型均采用基于理想电机假设条件计算其P-Q容量图,而实际运行的发电机都不是理想电机,因此计算误差较大,并导致盲目限制发电机进相运行能力的后果。针对此问题,该文提出了一种新的发电机工况参数数学模型用以确定发电机进相运行能力,并将其应用到石景山热电厂发电机故障诊断专家系统之中,实现了发电机进相运行时的在线监测。

The New Method of Determining the Capability of Leading Phase of Generator and Realizing the on-line Monitoring

With the increase of the power grid capacity and the voltage level upgrades, the problems of the power system became important increasingly, such as the reactive power is overmuch, the voltage of the key point is much high in valley load period, "leading phase of generator" mode has been applied gradually as a means for adjusting voltage because it has many special excellence, including simple executive, security, economy, adjust continuously, etc.." But when using the "leading phase" mode, you must determine its capability of the leading phase of the generator scientifically and set up the effective on-line monitoring instrument. In this way you can ensure that "the generator can operate safety" under the "leading phase" mode. Generally it uses the conventional mathematics model which is based of the ideal assume condition to calculate the P-Q capacity figure, but the actual generators in use are not perfect, so there are biggish error in calculation, and it cause the result that the someone restrict the ability of the leading phase of generator blindly. To solve this problem, we research and provide one new "operating conditions parameter mathematics model .of generator" to determine the capability of the "leading phase of generator". We apply it in the project of the fault diagnosis expert system of generator of SHIJINGSHAN thermoelectric power plant, and realize the on-line monitoring of the leading phase of generator.