基于概率法的交直流混联系统小干扰稳定性分析与改善
摘要：高压直流输电广泛运用于区域电网互联,使得传统交流低频振荡问题越发复杂。大多数对交直流低频振荡的研究都是针对单一运行方式的,本文采用概率法研究多运行方式下交直流混联系统的低频振荡特性并加以抑制。利用插入式建模技术(PMT)建立交直流输电系统和附加直流功率调制的小干扰模型;计算多运行方式下的概率潮流,采用混合中心距和半不变量结合Gram-Charlier级数展开的方法求解概率特征根。基于含交直流混联的四机两区域系统,分别使用中心频率法和测试信号法设计电力系统稳定器(PSS)和附加直流功率调制器(DCM)。根据控制效果提出DCM和PSS参数分步设计的协调原则,仿真结果表明系统小干扰概率稳定性得到明显改善。
Abstract:High voltage direct current (HVDC) transmission is widely used in the interconnection of regional Power grid, which makes the traditional AC low frequency oscillation more complex. Most of researches on AC/DC low frequency oscillation only consider single operation mode. Under multi-operating conditions, probability method is used to study and suppress the low frequency oscillation characteristics of hybrid AC/DC system in this paper. The plug-in modeling technology (PMT) is applied to establish the small disturbance model of AC/DC transmission system and DC power modulation controller. In this paper, the probabilistic load flow under multi-operating conditions is calculated, and characteristic root is solved by combing mixing center distance and semi-invariant combination Gram-Charlier series expansion methods. Based on four-machine two-area hybrid AC/DC system, power system stabilizer (PSS) and additional DC power modulator (DCM) are designed by using center frequency method and test signal method respectively. According to control effect of the controllers, the coordination principle of DCM and PSS is presented. The simulation results show that the probability small-signal stability of power system can be improved significantly.
标题：基于概率法的交直流混联系统小干扰稳定性分析与改善
英文标题：Small Signal Stability Analysis and Improvement of Hybrid AC/DC System Based on Probability Method
作者：贾庆宇, 边晓燕, 宗秀红,
关键词：概率特征根, 附加直流功率调制, 插入式建模(PMT), 交直流混联, 中心频率法,
发表日期：2018-06-09
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