五电平MMC-UPQC的无源控制

发布时间：2018-04-03 03:09

本文选题：模块化多电平变换器-统一电能质量调节器　切入点：EL模型　出处：《电工技术学报》2017年S2期

【摘要】：分析五电平模块化多电平变换器-统一电能质量调节器(MMC-UPQC)的主电路拓扑和工作原理,建立其在dq0坐标系下的数学模型及EL模型。为加快误差能量收敛,采用阻尼注入方法设计电流内环无源控制器,确保MMC-UPQC的稳定性;通过电压外环PI控制器获得内环期望电流,消除静态误差。所提出的无源控制实现了对有功和无功的解耦控制,使系统具有良好的动静态性能。在负序二倍频坐标变换下采用相间解耦控制抑制环流,减少开关损耗;采用基于Park变换的电压电流补偿量提取方法,无需锁相环,提高补偿精度。最后在Matlab/Simulink搭建五电平MMC-UPQC仿真模型,仿真结果表明能够较准确地补偿不平衡、谐波电压以及无功、谐波电流,证明了无源控制的可行性。
[Abstract]:The main circuit topology and working principle of MMC-UPQC, a five-level modular multilevel converter, are analyzed, and its mathematical model and El model in dq0 coordinate system are established.In order to accelerate the convergence of error energy, the passive controller of current inner loop is designed by damping injection method to ensure the stability of MMC-UPQC, and the expected current of inner loop is obtained by voltage outer loop Pi controller, and the static error is eliminated.The proposed passive control realizes decoupling control of active and reactive power and makes the system have good dynamic and static performance.The phase decoupling control is used to suppress the circulation and reduce the switching loss under the negative sequence second harmonic coordinate transformation. The voltage and current compensation extraction method based on Park transform is used to improve the compensation accuracy without phase-locked loop.Finally, a five-level MMC-UPQC simulation model is built in Matlab/Simulink. The simulation results show that the unbalanced, harmonic voltage, reactive power and harmonic current can be compensated accurately, and the feasibility of passive control is proved.
【作者单位】：北京信息科技大学自动化学院;
【基金】：国家自然科学基金(51477011) 北京市自然科学基金重点项目(KZ201511232035) 北京市高创计划教学名师项目(PXM 2017-014224-000025)资助
【分类号】：TM761

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