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级联型电力电子变压器分级解耦控制
作者:
作者单位:

1.南京南瑞继保电气有限公司,江苏省 南京市 211002;2.国网江苏省电力有限公司电力科学研究院,江苏省 南京市 210003;3.南瑞集团有限公司(国网电力科学研究院有限公司),江苏省 南京市 211106

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基金项目:

国网江苏省电力有限公司科技项目(J2019126);国家重点研发计划资助项目(2017YFB0903300)。


Hierarchical Decoupling Control of Cascaded Power Electronic Transformer
Author:
Affiliation:

1.NR Electric Co., Ltd., Nanjing 211102, China;2.Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., Nanjing 211103, China;3.NARI Group Corporation (State Grid Electric Power Research Institute), Nanjing 211106, China

Fund Project:

This work is supported by State Grid Jiangsu Electric Power Co., Ltd. (No. J2019126) and National Key R&D Program of China (No. 2017YFB0903300).

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    摘要:

    应用于交直流混合配电网的级联型电力电子变压器(PET)能够实现柔性互联、电压变换、电气隔离和功率控制等多种功能。由于级联型PET内部的级联H桥级和双有源桥级之间电气耦合程度高且控制目标不同,提出一种分级解耦控制方案,简化控制架构的同时实现各级的独立灵活控制。此外,针对级联型PET采用多个功率单元输入串联输出并联的拓扑结构,提出一种基于分级解耦控制的串联均压并联均流控制策略,降低参数差异的影响。研制了一台额定交流电压为10 kV、额定直流电压为750 V、额定容量为500 kVA的级联型PET,实验结果验证了该控制方案工程应用的可行性及有效性。

    Abstract:

    Cascaded power electronic transformer (PET) for hybrid AC/DC distribution network can achieve multiple functions such as flexible interconnection, voltage conversion, electrical isolation and power control. Due to the high degree of electrical coupling between the cascaded H-bridge and the dual active bridge stage in the cascaded PET with different control objectives, a hierarchical decoupling control scheme is proposed to simplify the control architecture and achieve independent flexible control at all levels. For the topology structure of cascaded PET adoptes multiple input-series output-parallel (ISOP) power units, a control strategy of series voltage equalization and parallel current equalization based on hierarchical decoupling control is proposed to reduce the influence of parameter differences. A cascade PET with a rated AC voltage of 10 kV, a rated DC voltage of 750 V and a rated capacity of 500 kVA is developed, and the experimental results verify the feasibility and effectiveness of the engineering application of the control scheme.

    表 2 Table 2
    表 1 Table 1
    图1 三相级联型PET拓扑结构Fig.1 Topology structure of three-phase cascaded PET
    图2 CHB级变换器控制框图Fig.2 Control diagram of CHB converter
    图3 CHB级变换器交流端电压电流矢量图Fig.3 Voltage and current vector diagram on AC port of CHB converter
    图4 各H桥变换器的直流侧电压平衡控制Fig.4 Voltage balance control at DC side of each H-bridge converter
    图5 DAB级变换器控制框图Fig.5 Control diagram of DAB converter
    图 应用于交直流混合配电网的PETFig. PET used in AC-DC hybrid distribution network
    图 PET功率单元拓扑图Fig. Circuit diagram of a power module of PET
    图 单个DAB变换器的等效电路图Fig. Equivalent circuit of a single DAB converter
    图 正向功率传输时PET实验波形Fig. Experiment waveform of PET during forward power transmission
    图 反向功率传输时PET实验波形Fig. Experiment waveform of PET during reverse power transmission
    图 正向功率传输时交流侧电流谐波分析Fig. Harmonic analysis of AC current during forward power transmission
    图 反向功率传输时交流侧电流谐波分析Fig. Harmonic analysis of AC current during reverse power transmission
    图 满载时CHB级变换器直流侧电压Fig. DC voltage of CHB converter at full load
    图 满载时DAB级变换器直流侧电流Fig. DC current of DAB converter at full load
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引用本文

魏星,朱信舜,袁宇波,等.级联型电力电子变压器分级解耦控制[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20200227015.
WEI Xing,ZHU Xinshun,YUAN Yubo,et al.Hierarchical Decoupling Control of Cascaded Power Electronic Transformer[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200227015.

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  • 收稿日期:2020-02-27
  • 最后修改日期:2020-06-22
  • 录用日期:2020-04-24
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