双端有源MMC-HVDC系统的控制策略研究 |
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作者姓名: | 李健 陈卓 |
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作者单位: | 贵州大学电气工程学院 贵州 贵阳 550025,贵州大学电气工程学院 贵州 贵阳 550025 |
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基金项目: | 基金项目: 国家自然科学基金资助项目(51567005) 黔科合平台人才([2017]5788) 黔科合(LH字[2017]7230) |
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摘 要: | 多端模块化多电平变流器(Modular Multilevel Converter,MMC)一直是柔性高压直流输电系统(High Voltage Direct Current,HVDC)工程应用的重要部分,因此对其控制策略的研究很有实际意义。本文基于三相静止坐标系下MMC的数学模型,建立了dq旋转坐标系下的数学模型,根据瞬时功率理论设计出外环功率和内环电流的MMC-HVDC系统控制器。针对传统电容电压平衡策略的问题,从减少开关频率的角度提出了改进型的子模块电容均压方式。由于本文中真模型中相单元子模块过多,为使系统更稳定可靠运行采用了最近电平逼近策略(nearest level modulation,NLM)。最后在Matlab/Simulink仿真软件中搭建89电平双端有源MMC-HVDC系统模型,从改变控制器参考值、有功功率反转等角度对控制系统进行仿真分析对比,验证了MMC-HVDC系统控制器的可靠性和稳定性。
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关 键 词: | 模块化多电平变流器 控制策略 电容电压平衡策略 最近电平逼近策略 控制器 |
收稿时间: | 2018/6/10 0:00:00 |
修稿时间: | 2018/6/10 0:00:00 |
Research on control strategy of Two-terminal MMC-HVDC supplying active networks |
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Authors: | Li Jian and Chen Zhuo |
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Affiliation: | College of electrical engineering,Guizhou University,College of electrical engineering,Guizhou University |
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Abstract: | MMC has been an important part of the HVDC engineering application all the time. Therefore, it is a great practical significance to study its control strategy. Based on the mathematical model of MMC in three-phase stationary coordinate system, a mathematical model in DQ rotating coordinate system is established. According to instantaneous power theory, MMC-HVDC system controller is designed for outer loop power and inner loop current. Aiming at the traditional capacitor voltage balancing strategy, an improved sub module capacitor voltage sharing method is proposed from the perspective of reducing switching frequency. Due to there are too many sub modules in the real model, the NLM strategy is adopted to make the system more stable and reliable. Finally, a 89 level MMC-HVDC system model is built in the Matlab/Simulink simulation software. From the angle of changing the reference value of the controller and the active power reversal , the control system is simulated and verified the reliability and stability of the MMC-HVDC system controller . |
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Keywords: | MMC control strategy the capacitor voltage balancing strategy NLM controller |
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