基于振荡暂态能量下降的VSC-HVDC双侧模糊无功阻尼控制器设计  

Design of VSC-HVDC Bilateral Fuzzy Logic Reactive Power Damping Controller Based on Oscillation Transient Energy Decrease

作　　者：刘凯[1] 张英敏[1] 李兴源[1] 蒋容[1] 曾琦[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2016年第4期1030-1036,共7页Power System Technology

基　　金：国家电网公司科技项目(SGQHJY00GHJS1400044)~~

摘　　要：目前柔性直流输电系统中低频振荡阻尼控制主要是利用柔性直流的有功功率进行调制。为不影响柔性直流输送的直流功率并充分利用换流站的调制能力,基于振荡能量下降原理提出一种同时利用柔性直流整流侧和逆变侧无功抑制低频振荡的阻尼控制器设计方法。首先推导出无功控制规律,依据此规律采用模糊逻辑方法设计出双侧模糊无功阻尼控制器。在控制器设计过程中,无需对系统进行辨识,因此控制器不依赖于系统特定运行状态对应的精确模型,具有较强的鲁棒性。最后,设计传统极点配置阻尼控制器进行对比。仿真结果表明,基于文中方法设计的双侧模糊无功阻尼控制器能有效抑制系统低频振荡,鲁棒性好,而且无需专门的参数协调方法也能达到两侧控制器协调输出的效果,严重故障时能充分利用2个换流站的调制能力。Now active power modulation is major approach to suppress low frequency oscillation of power systems linked with VSC-HVDC. In order not to affect VSC-HVDC＇s active power transmission capacity and make full use of converter＇s modulation ability, in this paper, a damping controller design method is proposed using both rectifier and inverter＇s reactive power to suppress low frequency oscillation based on oscillation energy decrease theory. Reactive power control regularities are deduced. According to the control regularities,a bilateral reactive power damping controller using fuzzy logical method is obtained. It is no need to identify system mode in controller design, so the designed controller is independent of accurate mode of system＇s specific operating condition with strong robustness. To validate performance of the designed controller, a traditional pole assigned controller is designed for contrast. Simulation results show that bilateral fuzzy logic reactive power damping controller designed in this paper can suppress low frequency oscillation efficiently and has strong robustness. Besides, the damping controller don＇t need special parameter coordination measures to achieve two coordinated outputs of the controller, and can make full use of two converter＇s modulation capacity.

关 键 词：振荡暂态能量 无功调制 低频振荡 柔性直流附加控制 模糊控制 

分 类 号：TM71[电气工程—电力系统及自动化]