电工技术学报  2022, Vol. 37 Issue (zk1): 277-287    DOI: 10.19595/j.cnki.1000-6753.tces.L90526
电力电子 |
考虑多约束指标的直流微电网虚拟电容控制方法
张赟, 王毅, 孟建辉, 刘宝
新能源电力系统国家重点实验室(华北电力大学) 保定 071003
Virtual Capacitance Control Method of DC Microgrid Considering Multiple Constraints
Zhang Yun, Wang Yi, Meng Jianhui, Liu Bao
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding 071003 China
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摘要 作为解决高度电力电子化直流微电网低惯性问题的一种有效途径,虚拟电容控制在实际工程应用中还需满足一定约束条件以保证系统安全可靠运行。为此,综合考虑蓄电池荷电状态、直流电压变化率、变流器瞬时输出功率及变流器单位时间内输出功率等影响因素,提出一种考虑多约束指标的虚拟电容控制方法。首先,通过分析各约束指标改进了虚拟电容计算公式,不同运行工况可依据指标侧重程度调节对应权重值,所得虚拟电容经公式变换后用于实时修正内环电流参考值以改变蓄电池侧功率输出,在直流微电网稳定运行的前提下尽可能提高设备长期安全运行能力;其次,采用小信号建模分析法揭示所提控制方法中主要控制参数对系统稳定性的影响规律,为关键参数取值提供了依据;最后,通过搭建控制器级硬件在环测试平台验证了所提控制方法的有效性及稳定性分析的正确性。
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张赟
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关键词 直流微电网虚拟电容多约束指标稳定性分析硬件在环    
Abstract:As an effective way to solve the low inertia problem of highly power electronic DC microgrids, virtual capacitance control needs to meet certain constraints in actual engineering applications to ensure the safe and reliable system operation. Accordingly, a virtual capacitance control method considering multiple constraintsis proposed, which synthetically considers some factors such as batteries’ state of charge, DC voltage change rate, instantaneous output power and output power per unit time of the converter. Firstly, the virtual capacitance calculation formula is improved by analyzing each constraint index. And the weights under different operating conditions are adjusted according to their importance. The obtained virtual capacitance is used to modify the inner loop current reference value in real time after formula conversion, which will change the battery power output, and improve long-term safe operation capability of the equipment as much as possible. Secondly, the small signal modeling analysis method is used to reveal the influence of main control parameters on the system stability, which provides a basis for selecting key parameter values. Finally, the effectiveness of proposed control method and correctness of stability analysis are verified by building the controller-level hardware-in-the-loop test platform.
Key wordsDC microgrid    virtual capacitance    multi-constrained index    stability analysis    hardware-in-the-loop   
收稿日期: 2020-07-14     
PACS: TM46  
基金资助:国家自然科学基金(51807064)、河北省自然科学基金(E2018502152)和中央高校基本科研业务费专项资金(2019MS074)资助项目
通讯作者: 张 赟 女,1996年生,硕士研究生,研究方向为新能源发电与电力系统。E-mail:1034044638@qq.com   
作者简介: 王 毅 男,1977年生,教授,博士生导师,研究方向为电力电子技术在电力系统中的应用。E-mail:yi.wang@ncepu.edu.cn
引用本文:   
张赟, 王毅, 孟建辉, 刘宝. 考虑多约束指标的直流微电网虚拟电容控制方法[J]. 电工技术学报, 2022, 37(zk1): 277-287. Zhang Yun, Wang Yi, Meng Jianhui, Liu Bao. Virtual Capacitance Control Method of DC Microgrid Considering Multiple Constraints. Transactions of China Electrotechnical Society, 2022, 37(zk1): 277-287.
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