基于准PR控制器的MMC-HVDC的控制及环流抑制策略

发布时间：2018-03-11 04:23

本文选题：柔性直流输电　切入点：模块化多电平换流器　出处：《电力系统及其自动化学报》2016年11期 　论文类型：期刊论文

【摘要】：基于模块化多电平换流器MMC(modular multilevel converter)的柔性直流输电HVDC(high voltage directcurrent)系统日益受到关注。传统dq坐标系下双闭环比例积分PI(proportional integral)控制需要前馈解耦,特别是在电网电压不平衡时,需要正负序分解,而环流抑制的方法也过于复杂。在分析模块化多电平换流器型直流输电MMC-HVDC工作原理的基础上,给出了αβ坐标系下,基于准比例谐振QPR(quasi proportional resonant)控制器的MMC-HVDC的控制策略,无需前馈解耦和正负序分解,控制器设计简单,同时也给出了一种基于QPR控制器的有效抑制2倍频环流的新方法。在PSCAD(power systems computer aided design)中对上述控制策略进行了仿真验证,仿真结果表明了所提策略的正确性和有效性。
[Abstract]:The HVDC(high voltage direct current) system based on modularized multilevel converter (MMC(modular multilevel converters) is paid more and more attention. In traditional DQ coordinate system, feedforward decoupling is required for double closed loop proportional integral PI(proportional (PI(proportional) control, especially when the voltage of the power network is unbalanced. The positive and negative sequence decomposition is needed, and the method of current suppression is too complicated. Based on the analysis of the principle of modularized multilevel converter MMC-HVDC, the 伪尾 coordinate system is given. The control strategy of MMC-HVDC based on quasi-proportional resonance QPR(quasi proportional resonance controller is simple without feedforward decoupling and positive and negative sequence decomposition. At the same time, a new method based on QPR controller is presented to suppress the double frequency circulation effectively. The simulation results in PSCAD(power systems computer aided design show that the proposed strategy is correct and effective.
【作者单位】：西安理工大学自动化与信息工程学院;
【基金】：高等学校博士学科点专项科研基金资助项目(20126118110009) 陕西省重点学科建设专项基金项目(105-5X1301)
【分类号】：TM721.1

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