基于子模块电压波动估计的MMC双环二倍频环流抑制策略
发布时间：2019-07-02 09:41
【摘要】：模块化多电平变换器以其优越的性能在大功率电能变换领域得到了广泛应用和研究。推导了MMC子模块电容电压波动和桥臂投入模块数的表达式,针对MMC环流控制器性能分析的多样性、复杂性和电压波动的计算问题,提出一种基于子模块电容电压波动估计前馈+电压电流双闭环反馈的复合环流控制策略,有效结合前馈控制的快速跟踪性和反馈控制的闭环跟踪性能,同时优化计算环节。所提方法包括四部分:子模块电容电压的前馈估算;基于小信号模型的二倍频环流电压指令计算;投入模块数的计算;子模块电容电压的排序及其投切。其中二倍频环流电压指令通过电压电流双闭环控制器获得,并通过等效闭环阻抗分析其动态性能,选取达到最佳抑制效果时合适的控制参数。仿真和实验结果验证了所提方法的有效性。
[Abstract]:Modular multilevel converters have been widely used and studied in the field of high power conversion because of their superior performance. The expressions of capacitance voltage fluctuation and bridge arm input module number of MCMC sub-module are derived. aiming at the diversity, complexity and voltage fluctuation calculation of MMC circulation controller performance analysis, a compound circulation control strategy based on capacitance voltage fluctuation estimation feedforward voltage and current double closed-loop feedback is proposed, which effectively combines the fast tracking of feedforward control with the closed-loop tracking performance of feedback control, and optimizes the calculation link at the same time. The proposed method includes four parts: feedforward estimation of capacitance voltage of sub-module; instruction calculation of double frequency circulation voltage based on small signal model; calculation of number of input modules; ranking and switching of capacitance voltage of sub-module. The double frequency circulation voltage instruction is obtained by the voltage and current double closed loop controller, and its dynamic performance is analyzed by the equivalent closed loop impedance, and the appropriate control parameters are selected to achieve the best suppression effect. Simulation and experimental results verify the effectiveness of the proposed method.
【作者单位】： 国家电能变换与控制工程技术研究中心(湖南大学);
【基金】：国家自然科学基金面上项目(51477045);国家自然科学基金项目(51507057) 湖南省研究生科研创新项目(CX2016B127)资助
【分类号】：TM46;TM721.1
，
本文编号：2508818
[Abstract]:Modular multilevel converters have been widely used and studied in the field of high power conversion because of their superior performance. The expressions of capacitance voltage fluctuation and bridge arm input module number of MCMC sub-module are derived. aiming at the diversity, complexity and voltage fluctuation calculation of MMC circulation controller performance analysis, a compound circulation control strategy based on capacitance voltage fluctuation estimation feedforward voltage and current double closed-loop feedback is proposed, which effectively combines the fast tracking of feedforward control with the closed-loop tracking performance of feedback control, and optimizes the calculation link at the same time. The proposed method includes four parts: feedforward estimation of capacitance voltage of sub-module; instruction calculation of double frequency circulation voltage based on small signal model; calculation of number of input modules; ranking and switching of capacitance voltage of sub-module. The double frequency circulation voltage instruction is obtained by the voltage and current double closed loop controller, and its dynamic performance is analyzed by the equivalent closed loop impedance, and the appropriate control parameters are selected to achieve the best suppression effect. Simulation and experimental results verify the effectiveness of the proposed method.
【作者单位】： 国家电能变换与控制工程技术研究中心(湖南大学);
【基金】：国家自然科学基金面上项目(51477045);国家自然科学基金项目(51507057) 湖南省研究生科研创新项目(CX2016B127)资助
【分类号】：TM46;TM721.1
，
本文编号：2508818
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