一种计及多重开关的电力电子时域仿真插值算法  

An Interpolation Algorithm for Time-Domain Simulation of Power Electronics Circuit Considering Multiple Switching Events

作　　者：王成山[1] 李鹏[1] 黄碧斌[1] 王立伟 高菲[1] 

机构地区：[1]天津大学电力系统仿真控制教育部重点实验室,天津300072 [2]University of British Columbia Vancouver Canada

出　　处：《电工技术学报》2010年第6期83-88,共6页Transactions of China Electrotechnical Society

基　　金：教育部科学技术研究重大项目(306004);国家自然科学基金资助项目(50595412;50625722)

摘　　要：电力电子技术的广泛应用对含有电力电子装置的电力系统电磁暂态仿真提出了新的要求与挑战。提出了一种适于非实时仿真并计及多重开关动作的电力电子时域仿真插值算法。该算法通过插值确定开关动作的准确时刻,解决了定步长方法中仿真步长与开关动作时刻不一致的问题,之后在开关动作时刻以半步长后向欧拉法的试探积分考虑了常见的同步开关动作问题,同时对于这一过程中可能出现的多重开关动作将在开关动作后的半个步长时刻对系统的各个量进行重初始化,从而得到该时刻正确的网络拓扑和系统初值,消除了开关动作引起的数值振荡问题。最后,通过两个算例详细比较了本文算法与PLECS的仿真结果,验证了算法的有效性,仿真结果表明本文的算法对步长的增加不敏感,同时具有较高的稳定性和数值精度。Traditional electromagnetic transient simulation for power system is challenging by the appearance of a number of power electronics apparatuses. A novel interpolation algorithm suited for non-real-time simulation of power electronics circuits is presented with the consideration of multiple switching events. The algorithm employs interpolation to determine the actual switching time for solving the problem produced by fixed time-step integration method. Attempt with halved time-step backward Euler method is used to deal with simultaneous switching which is commonly encountered during the simulation. Furthermore, the system variables are reinitialized at the point a halved time-step later after the switching to consider the multiple switching events. As a result, correct topology and values at the point are obtained to advance the simulation without numerical oscillation. Finally, two test cases are compared with the results obtained from PLECS to show the validity of the proposed algorithm. The algorithm is proved to be stable and accurate even with a larger time-step.

关 键 词：电力电子 电磁暂态 插值 多重开关 同步开关 

分 类 号：TM744[电气工程—电力系统及自动化]