MMC-HVDC的二阶线性自抗扰控制策略

发布时间：2018-10-10 11:08

【摘要】：基于模块化多电平换流器的高压直流输电(MMC-HVDC)技术已得到广泛运用,但传统基于dq同步旋转坐标系的双闭环PI控制中电流内环需要依赖系统数学模型进行前馈解耦补偿,并且一阶非线性自抗扰控制器设计参数过多、整定困难。针对上述问题,提出了MMC-HVDC的二阶线性自抗扰控制策略。设计了MMCHVDC的双闭环二阶线性自抗扰控制器,实现了有功和无功功率的完全解耦控制,所设计控制器还具有响应速度快、抗扰能力强以及不依赖被控对象数学模型等优点;为了降低桥臂子模块的开关次数,改进了子模块电容电压平衡控制算法;在PSCAD/EMTDC中搭建了21电平MMC-HVDC的电磁暂态仿真模型,通过仿真验证了所设计控制器具有良好的控制性能和电容电压平衡控制算法的有效性。
[Abstract]:High voltage direct current transmission (MMC-HVDC) technology based on modularized multilevel converter has been widely used, but in the traditional double closed loop PI control based on dq synchronous rotating coordinate system, the current inner loop needs to rely on the mathematical model of the system for feedforward decoupling compensation. And the design parameters of the first order nonlinear ADRC are too many and the tuning is difficult. To solve the above problems, a second order linear active disturbance rejection control strategy for MMC-HVDC is proposed. A two-closed-loop second-order linear active disturbance rejection controller for MMCHVDC is designed, which realizes the complete decoupling control of active and reactive power. The designed controller also has the advantages of fast response speed, strong anti-disturbance ability and independent mathematical model of the controlled object. In order to reduce the switch times of the bridge arm sub-module, the capacitor voltage balance control algorithm of the sub-module is improved, and the electromagnetic transient simulation model of the 21-level MMC-HVDC is built in PSCAD/EMTDC. The simulation results show that the designed controller has good control performance and the effectiveness of the capacitive voltage balance control algorithm.
【作者单位】：天津大学智能电网教育部重点实验室;国网福建省电力有限公司电力科学研究院;
【分类号】：TM721.1

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