摘要
简要概述基于电压源型换流器的轻型直流输电(VSC-HVDC)系统的工作原理,建立在同步旋转坐标系下的暂态数学模型。采用自抗扰控制(ADRC)方法设计送端系统和受端系统外环电压、功率控制器,以产生内环电流参考值。送端系统外环采用最优控制函数(Fal函数),内环采用一阶自抗扰控制器来跟踪参考电流;受端系统外环采用一阶自抗扰控制器,内环采用Fal函数来跟踪参考电流。采用以上控制策略实现系统模型的完全解耦并实现有功功率、无功功率独立控制的目的。利用MATLAB/Simulink对所设计的控制器进行数字仿真,仿真结果显示:对于交直流系统电压变化、有功功率及无功功率阶跃的情况,系统均能实现快速的动态响应,达到满意的控制性能指标。
The operating principle of VSC-HVDC system is briefly discussed and its transient mathematical model is established in the synchronous rotating coordinates. The ADRC （Auto Disturbance Rejection Control） method is adopted in the design of outer loop voltage/power controller to generate the inner loop current references for rectifier and inverter. The Fal function is employed in the outer loop of sending terminal and the first-order ADRC is employed in its inner loop to track the current reference while the first-order ADRC in the outer loop of receiving terminal and the Fal function in its inner loop to track the current reference,which is applied to realize the complete decoupling of system model and the independent control of system active power and reactive power. The designed controller is simulated with MATLAB/ Simulink and results show that,with satisfied control performance,system responds quickly to the variation of AC/DC system voltage and the step change of active/reactive power.
出处
《电力自动化设备》
EI
CSCD
北大核心
2013年第5期65-69,75,共6页
Electric Power Automation Equipment
