基于一种动态等值新方法的直流功率调制控制策略  

HVDC Modulations Using New Dynamic Equivalence Method

作　　者：陈厚合[1] 姜涛[2] 李国庆[1] 

机构地区：[1]东北电力大学电气工程学院,吉林132012 [2]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电工技术学报》2013年第6期192-200,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50977009)

摘　　要：提出一种新的交直流混合系统直流功率调制控制策略。针对目前动态等值方法的不足,以动态响应因子为权系数对交直流混合系统交流部分进行动态等值,定义机组动态稳定性指标以确定等值系统的主导机群,对主导机群采用详细模型、余下机群采用简化模型进行等值,有效提高了交直流混合系统的等值精度;根据等值后交直流系统特点,设计了一种新的直流非线性功率调制控制策略,为克服系统全状态反馈条件难以实现的不足,采用等值系统主导机群的状态变量作为调制输入信号,在保证控制效果的前提下,降低了控制策略实现的难度。典型多机交直流混合系统的仿真结果验证了所提控制策略的有效性和可行性。A new supplementary control strategy for AC/DC power system is presented. The dynamic response factor is utilized as a new coefficient for dynamic equivalence to enhance the accuracy of dynamic equivalence. A new dynamic stability index is defined to divide critical cluster and remaining cluster of the coherent generators. The detailed models of critical cluster and the simplified models of remaining cluster are applied in the equivalent system. Utilizing the equivalent strategy, a rational nonlinear optimal supplementary control strategy is proposed for the AC/DC system. The control strategy only requires the critical clusters＇ speeds and angles as modulation signals, which ensures the control effect and reduces the difficulty of control strategy implementation. The simulation supports the feasibility and validity of the proposed control strategy.

关 键 词：动态等值 动态响应因子 动态稳定性指标 附加控制策略 全状态反馈 

分 类 号：TM77[电气工程—电力系统及自动化]