电力系统机电暂态仿真多机控制系统诊断分析

为了提高电力系统机电暂态控制能力,提出了以主导轨迹断面阻尼比灵敏度条件来分析仿真关键参数的方案,从而将轨迹特征根处理思想引入工程分析中。系统通过二个典型模式发生振荡,仿真测试后以Prony方法处理发电机的功角曲线生成振荡变化的特征量组,判断模式二属于主导仿真模式。通过时段主导模式得到的轨迹断面阻尼比灵敏度更高。在相同的模式下,当参与因子提高后,机组控制系统可以形成更高的轨迹断面阻尼比灵敏度。对于复杂多机系统,可以利用轨迹断面阻尼比灵敏度来诊断控制系统的各项参数,从而更高效地处理复杂振荡模式并降低计算量。经过3.5 s仿真后,考虑到Dy比规定门槛值更大,机组励磁控制系统具有增幅振荡的特性。当T_A上升后能够达到更高的稳定性,参数T_A提高形成了更平稳的励磁电流与功角曲线。

DiaMnosis and analysis of electromechanical transient simulation multi-machine control system in power system

In order to improve the electromechanical transient control ability of power system, a scheme was proposed to analyze the key parameters of simulation with the sensitivity condition of the damping ratio of the dominant track section, so as to introduce the idea of track feature root processing into the engineering analysis.The system oscillates through two typical modes. After the simulation test, the power Angle curve of the generator is processed by Prony method to generate a set of characteristics of oscillation variation. It is judged that mode 2 belongs to the dominant simulation mode.The track cross section damping obtained by the time-period dominant mode is higher than the sensitivity.Under the same mode, when the participation factor is increased, the unit control system can form a higher trajectory section damping ratio sensitivity.For complex multi-machine system, the track section damping ratio sensitivity can be used to diagnose the parameters of the control system, so as to deal with the complex oscillation mode more efficiently and reduce the computation.After 3.5 s simulation, considering that Dy is larger than the specified threshold value, the excitation control system of the unit has the characteristic of increasing oscillation.When T_A rises, it can reach a higher stability. When T_A increases, it forms a more stable curve of excitation current and work angle.