柴油发电机组并联运行稳定性研究

摘要

In order to analyze quantitatively the stability of parallel operation of diesel generator sets and monitor the state of generators being out of step during development of a simulator for the ship power system,calculation formulae for parameters of the swing angle were deduced. An on-line algorithm for calculating the parameters of swing curves of generators was presented, and the parametric exponents of the curve were calculated by solving high-order state differential equations. In addition,the stability degree of parallel operation (SDPO)was defined,and the Simulink tool box was used to set up a simulation system to verify the algorithm. The results of simulation examples show that the SDPO can indicate the stability allowance of parallel operation of diesel generator sets. The parameters obtained by the algorithm can reflect the stability of parallel operation in real time during the simulator training. The parameters of the swing curve can be determined by differentiation of the curve from the first to the forth order. When the exponents change with time or the data of the curve are discrete,the parametric exponent can be obtained by derivation using the five-point interpolation method.%在船舶电站模拟器研制中，为了对柴油发电机组并联运行时的失步进行监视并定量分析其稳定性，推导了摇摆角的参数计算公式，提出了发电机组摇摆曲线参数的在线算法。通过求解多阶导数构成的状态方程组，求出了曲线的指数参数。定义并联运行稳定度，利用Simulink工具箱构建了仿真系统验证该算法。算例仿真结果表明：并联运行稳定度可以指示发电机组并联运行的稳定裕量；在电站模拟器训练中，该算法所求的参数能够及时反映发电机组并联运行的稳定性；发电机组的摇摆曲线参数可由曲线的1～4阶导数确定；当指数参数随时间变化或曲线数据离散时，可用五点式插值求导方法得到指数参数。