The instability occurring in OTSG (Once-Through Steam Generator) of movable nuclear power plants is presented by a multivariable frequency domain theory.As concerning coupling interactions of OTSG tubing,it is more ef...The instability occurring in OTSG (Once-Through Steam Generator) of movable nuclear power plants is presented by a multivariable frequency domain theory.As concerning coupling interactions of OTSG tubing,it is more efficient for analyzing the instability of OTSG compared the common single variable method.A mathematical model for the system is derived from the fundamental equations by using the perturbation,Laplace-transform and the nodalization techniques.The stable boundary and parameters which influence the stability of the system are evaluated through computer simulation.Numerical examples are given in the paper and the predictions of the model agree with the experimental results well.展开更多
柔性交流输电装置(flexible AC transmission system,FACTS)在提升电网安全稳定和运行效率方面发挥着重要的作用。随着柔性交流输电装置在电力系统中的广泛应用,研究系统中多FACTS的协调控制机理对于实现系统的协调阻尼控制具有重要的...柔性交流输电装置(flexible AC transmission system,FACTS)在提升电网安全稳定和运行效率方面发挥着重要的作用。随着柔性交流输电装置在电力系统中的广泛应用,研究系统中多FACTS的协调控制机理对于实现系统的协调阻尼控制具有重要的理论价值和现实意义。针对实现多FACTS协调控制过程中遇到的交互影响问题,提出基于选择模式分析(selective modal analysis,SMA)和多变量频域控制理论的多FACTS交互作用机理分析方法,通过SMA实现多FACTS交互作用的有效特征量提取,进而通过多变量频域控制理论推导出多FACTS间的交互作用关系和发生条件,并在此基础上揭示多FACTS间交互作用机理。研究结果表明:处于多机系统同一电力区域中的多台FACTS阻尼控制器间存在相互制约的关系,当控制器参数满足负交互条件时会发生比较明显的负交互作用,严重时甚至威胁系统的安全运行,当控制器参数满足协调运行条件时才能保证多FACTS间的协调运行与控制。通过仿真验证了文中机理研究的正确性以及在实际电网中应用的可行性。展开更多
文摘The instability occurring in OTSG (Once-Through Steam Generator) of movable nuclear power plants is presented by a multivariable frequency domain theory.As concerning coupling interactions of OTSG tubing,it is more efficient for analyzing the instability of OTSG compared the common single variable method.A mathematical model for the system is derived from the fundamental equations by using the perturbation,Laplace-transform and the nodalization techniques.The stable boundary and parameters which influence the stability of the system are evaluated through computer simulation.Numerical examples are given in the paper and the predictions of the model agree with the experimental results well.
