VSC-HVDC换流站二阶线性自抗扰控制器参数整定研究

Research on Parameter Tuning of Second-Order LADRC for VSC-HVDC Converter Station

柔性直流输电换流站控制器的性能对系统的安全稳定运行有重要意义。基于二阶线性自抗扰控制（linearactive disturbancerejectioncontrol,LADRC）设计了电压源换流器高压直流输电（或柔性直流输电）（voltagesourceconverter based high voltage direct current,VSC-HVDC）换流站控制器,实现了有功、无功的快速独立调节并发挥了自抗扰控制动态特性好、鲁棒性高、抗扰能力强的优势。提出了结合小信号分析法和频域法的优势整定LADRC控制器参数的具体方法,利用频域法精简控制器参数个数,建立系统全局小信号模型,从小信号稳定性的角度定量确定控制器参数,分析了小信号法与传统复频域法整定控制器参数的优劣。考虑外部交流系统对VSC-HVDC控制器参数整定的影响,通过算例验证了控制器的控制效果以及参数整定结果的正确性和有效性,最后给出了在工程上整定换流站线性自抗扰控制器参数的方法,为柔性直流输电换流站控制器的设计和LADRC参数整定提供了新思路。

Performance of voltage source converter based high voltage direct current（VSC-HVDC） converter station controller is of great significance for secure and stable operation of power system. A VSC-HVDC converter station controller is designed based on the second-order linear active disturbance rejection controller（LADRC）, realizing rapid and independent adjustment of active and reactive power. The controller exerts superiority of ADRC, such as outstanding dynamic performance, high robustness and strong anti-interference ability. A specific method is proposed to tune LADRC parameters, combining advantages of both small signal analysis and frequency domain method. Number of controller parameters is reduced using frequency domain method. A global small signal model of the system is established and the controller parameters are then determined quantitatively from the perspective of small signal stability. The advantages and disadvantages are finally analyzed for small signal method and complex frequency domain method on controller parameter tuning. Examples are given to verify performance of the designed controller, and correctness and effectiveness of parameter tuning results, considering the influence of external AC system on tuning of VSC-HVDC controller parameters. Finally, a method on tuning parameters of VSC-HVDC controller based on LADRC for engineering application is given. The research provides a new perspective on VSC-HVDC converter station controller design and LADRC parameter tuning.