电压源型直流输电变流器系统中电网侧变流器的反步法控制  

Backstepping control for voltage source converter-high voltage direct current grid side converter

作　　者：吴杰[1] 王志新[1] 王国强[1] 陆贤锋[2] 邹建龙 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]上海市电力公司嘉定供电公司,上海201800 [3]无锡清源电气科技有限公司,江苏无锡214714

出　　处：《控制理论与应用》2013年第11期1408-1413,共6页Control Theory & Applications

基　　金：国家"863"计划智能电网关键技术研发重大资助项目(2011AA05AA103);国家自然科学基金重点资助项目(60934005);上海市科技发展基金资助项目(11195802100);上海市教育发展基金资助项目(2010LM26);上海市教育发展基金资助项目(2011LM35);江苏省"六大人才高峰"课题资助项目(2010-XNY-001);江苏省创新基金资助项目(BC2011028)

摘　　要：随着适用于海上风电场长距离输电的电压源型直流输电变流器技术日趋成熟,其成功应用案例也在逐渐增多.为进一步提高海上风电场电力输送能力和并网的电能质量,论文研究带LCL滤波器的电网侧变流器控制方法,针对该变流器数学模型阶数较高的特点,采用反步法设计Lyapunov函数,经过3步反推得到最终控制量,满足系统渐进稳定的要求.该控制方法的特点是省去了滤波电容支路的阻尼电阻,同时也无需检测流过滤波电容的电流,从而避免了增加额外的传感器.最后,采用MATLAB进行仿真,结果表明,相对于传统带阻尼电阻的LCL滤波器,本文所提出控制方法可使电压总谐波畸变率(THD)更小,抑制高次谐波的效果更明显,且动态跟踪性能优于传统双闭环矢量控制,证明了所提出控制方法的正确性和有效性.The technique of voltage source converter-high voltage direct current （VSC-HVDC） for long distance trans- mission of offshore wind farms has become increasingly mature. Its successful application cases are gradually increased. To further enhance the power transmission capacity and power quality of offshore wind farms, we investigate the control method of grid side converter with LCL filter. Because of the high order of the mathematical model for the converter, the control strategy of back-stepping is employed. Based on that strategy, the final controller is developed through three back-steps, which assures the system of asymptotical stability. This method eliminates the damping resistor in the filter capacitor loop. Since there is no current in the filter capacitor, the additional sensors for the current measurement are no longer needed. Simulation analysis with MATLAB is carried out; the results are compared with the conventional LCL filter with damping resistor. Conclusions indicate that the total harmonic disturbance （THD） becomes lower due to the effective suppress of harmonic current. Meanwhile, the dynamic tracking performance is better than those obtained by conventional double closed-loop vector method. These facts show the efficacy of the proposed control method.

关 键 词：反步法 柔性直流输电 LCL滤波器 海上风电场 并网 

分 类 号：TM46[电气工程—电器]