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级联式电力电子变压器的主动非均衡功率控制
作者:
作者单位:

分布式储能与微网河北省重点实验室(华北电力大学), 河北省 保定市 071003

作者简介:

孙玉巍(1987—),女,博士,讲师,主要研究方向:电力电子技术在电力系统中的应用、电力电子变压器技术。E-mail: sunyuwei@ncepu.edu.cn
武承杰(1995—),男,硕士研究生,主要研究方向:电力电子变压器。E-mail: m15733291821@163.com

通讯作者:

付超(1979—),男,通信作者,博士,讲师,主要研究方向:新能源发电、电力电子技术与应用。E-mail: fuchao@ ncepu.edu.cn

基金项目:

国家重点研发计划资助项目(2016YFB0900203);河北省自然科学基金资助项目(E2019502172);中央高校基本科研业务费专项资金资助项目(2019MS075)。


Active Unbalanced Power Control of Cascaded Power Electronic Transformers
Author:
Affiliation:

Key Laboratory of Distributed Energy Storage and Micro-grid of Hebei Province (North China Electric Power University), Baoding 071003, China

Fund Project:

This work is supported by National Key R&D Program of China (No. 2016YFB0900203), Hebei Provincial Natural Science Foundation of China (No. E2019502172) and the Fundamental Research Funds for the Central Universities (No. 2019MS075).

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    摘要:

    电力电子变压器是交直流混合配电网的关键设备,为提高级联式电力电子变压器轻载运行效率,文中结合混合脉宽调制技术的非均衡特性,提出一种基于功率主动非均衡控制的效率优化策略。通过输入级级联H桥变换器在混合脉宽调制下的损耗分析以及隔离双向DC/DC变换器的损耗分析,建立了级联式电力电子变压器运行效率模型,据此分析各单元功率非均衡分配以提升整体运行效率的可行性。对混合脉宽调制下各单元功率稳定运行范围进行了推导,并提出适用于系统轻载效率优化的功率主动非均衡控制策略。最后,通过实验对所提控制策略与传统功率均衡控制进行了对比验证,结果表明所提功率非均衡控制可降低轻载条件下的系统损耗,提高电力电子变压器的整体效率。

    Abstract:

    Power electronic transformers (PETs) are the key equipment in AC/DC hybrid distribution network. In order to improve the operation efficiency of cascaded PET under the condition of light-load, this paper proposes an efficiency optimization strategy based on active unbalanced power control, which utilizes the unbalanced characteristics of hybrid pulse width modulation (HPWM) technology. By analyzing the power losses of both cascaded H-bridge converter with HPWM and isolated bidirectional DC/DC converter, the operation efficiency model of cascaded PET is established. Based on the efficiency model, the feasibility for improving the overall efficiency of PET through unbalanced power distribution of each module is analyzed. The power stable operation range of each unit with HPWM is derived, and the active unbalanced power control strategy suitable for system efficiency optimization under the condition of light-load is proposed. Finally, the validation of the proposed strategy in comparison with the traditional power balanced control is confirmed by experiments, and the results show that the proposed unbalanced power control can reduce the power loss under the condition of light-load and improve the overall efficiency of PET.

    表 1 PET功率损耗组成Table 1 Composition of power losses of PET
    表 6 Table 6
    表 2 2种控制方法下IBDC和CHB的损耗对比Table 2 Power loss comparison of IBDC and CHB with two power control methods
    表 3 功率分配方案对比Table 3 Comparison of power distribution schemes
    图1 模块化PET拓扑Fig.1 Topology of modular PET
    图2 系统控制框图Fig.2 Block diagram of system control
    图3 2种控制方法效率对比Fig.3 Efficiency comparison of two control methods
    图4 实验波形Fig.4 Experimental waveforms
    图5 实验效率对比Fig.5 Experimental efficiency comparison
    图 并网时各模块开关模式分配图Fig. Switch function distribution of each module on the grid
    图 PLCES测试与理论计算效率曲线Fig. PLCES test and Theoretical calculation efficiency curves
    图 不同功率控制方式下的PET效率曲线Fig. The efficiency curves of PET
    图 CHB输出特性Fig. CHB output characteristic
    图 级联PET实验系统Fig. Cascaded PET experimental system
    图 实验与理论计算效率曲线Fig. Experimental and theoretical calculation efficiency curves
    图 PET功率损耗组成Fig. Forms of power losses
    表 4 Table 4
    表 5 Table 5
    表 7 Table 7
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引用本文

孙玉巍,武承杰,付超,等.级联式电力电子变压器的主动非均衡功率控制[J].电力系统自动化,2020,44(6):155-163. DOI:10.7500/AEPS20190513001.
SUN Yuwei,WU Chengjie,FU Chao,et al.Active Unbalanced Power Control of Cascaded Power Electronic Transformers[J].Automation of Electric Power Systems,2020,44(6):155-163. DOI:10.7500/AEPS20190513001.

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  • 收稿日期:2019-05-13
  • 最后修改日期:2019-06-06
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  • 在线发布日期: 2020-03-21
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