一种估计同步发电机功角的新方法  

A NEW APPROACH TO ESTIMTING POWER ANGLE OF SYNCHRONOUS GENERATORS

作　　者：谢小荣[1] 肖晋宇[1] 李建[1] 韩英铎[1] 吴京涛 张涛 

机构地区：[1]清华大学电机工程系,北京100084 [2]北京四方同创保护与控制设备有限公司,北京100085

出　　处：《中国电机工程学报》2003年第11期106-110,共5页Proceedings of the CSEE

基　　金：国家自然科学基金(59877011)~~

摘　　要：功角是表征同步发电机运行状态和电力系统稳定性的重要参量,该文提出一种测量同步发电机功角的新方法,它利用发电机输出电压、电流的交流采样值和部分机组参数来估计功角,克服了传统电气计算方法在机组暂态过程中因受参数时变、磁饱和影响导致测量精度低的缺点。阐述了测量算法的推导和实现步骤,并将方法集成到同步相量测量单元(PMU)中;通过动态模拟试验验证方法的有效性,与脉冲方法实测的结果进行了比较。试验表明,提 出的方法在系统稳态和暂态过程中都能获得满意的估计精度。由于方法仅依赖于电气量采样,易于实现,且成本远低于采用非电气传感器的测量方法。Power angle is one of the most important variables to represent the working condition of synchronous generators and the stability of power systems. This paper proposes a novel approach to estimating generator's power angle by employing sampling values of terminal voltages/ currents and some model parameters. It overcomes the drawbacks of traditional methods, which have inferior accuracy during system transients because of time-varying parameters and magnetic saturation. Theoretic formula and signal-processing procedures are detailed in the paper. And the algorithm is further implemented and integrated in the Phasor Measurement Unit we developed. A dynamic simulation is conducted to validate the proposed method and to compare its effect with the method based on non-electrical sensors. Results demonstrate that the developed approach can achieve very satisfied accuracy in both steady state and transient period of power systems. Since the novel method only depends on sampling of electrical quantities, it is easy for implementation and costs much less than methods involving non-electrical sensors.

关 键 词：同步发电机 功角 电力系统稳定性 脉冲法 动态模拟试验 

分 类 号：TM341[电气工程—电机] TM712