【摘要】 <正> 二、用贝瑞隆法计及直流线路的分布参数由于我们只对直流线路两端换流站的暂态运行参数感兴趣,因此我们可以应用贝瑞隆法来将长线的分布参数处理成集总参数等值电路。由于这个方法是建立在长线波动方程的基础上的,因此在理论上是严格的。比用T型或π型链(无论用多少环节数)等值法都要精确。当然这是对无损线(不计线路电阻)而言,当计及线路电阻时,仍然须作近似处理,但计算表明,这种近似处理是足够准确的〔文3〕。更多还原

【Abstract】 A mathematical model for calculating the transient process of an HVDC system under the circumstance of a step-change of the DC current order is derived by using the modern control theory, discrete method,“state-averaging method”and“Bergeron method”. A set of recursion-iteration formulas are obtained and the program for calculation is formed. The transient stability and dynamic performances of an HVDC project are evaluated. The different results between using the lumped and distributed parameters of DC line and the different properties between Pulse Frequency Control and Pulse Phase Control are comp-ared The effects of the related parameters on stability are dis-cussed. All these dynamic processes can be calculated on a mic-rocomputer.更多还原