| 引用本文: | 李鹏飞,郭力,王洪达,李霞林,王成山,冯怿彬,朱想.直流微电网高频振荡稳定问题的降阶建模及分析[J].电力自动化设备,2021,41(5): |
| LI Pengfei,GUO Li,WANG Hongda,LI Xialin,WANG Chengshan,FENG Yibin,ZHU Xiang.Reduced-order modeling and analysis of high-frequency oscillation stability in DC microgrid[J].Electric Power Automation Equipment,2021,41(5): |
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| 摘要: |
| 为从等效电路角度揭示直流微电网高频振荡稳定机理，建立了直流微电网降阶电路模型。将直流电压控制单元降阶成等效电阻、电感串联电路模型，其中将下垂控制、直流电压控制及电流内环控制环节对系统高频稳定性的影响转化为可量化的等效电阻、等效电感。进一步结合采用等效电阻、电容并联电路的恒功率负荷模型，得到直流微电网全系统降阶电路模型，在此基础上提出了直流微电网高频振荡稳定性判据。并基于所提降阶模型，分析了直流电压控制单元详细控制参数对等效电阻、等效电感以及稳定性判据的影响，从等效电路的角度揭示了直流微电网发生高频振荡失稳的原因。最后，在PSCAD/EMTDC软件中对所提降阶模型进行了仿真验证。 |
| 关键词: 直流微电网 高频振荡 等效电路 降阶建模 稳定性分析 |
| DOI：10.16081/j.epae.202105010 |
| 分类号:TM727;TM712 |
| 基金项目:国家自然科学基金资助项目(51977142)；国家重点研发计划项目(2020YFB1506803)；天津市自然科学基金资助项目(20JCQNJC00350) |
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| Reduced-order modeling and analysis of high-frequency oscillation stability in DC microgrid |
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LI Pengfei1, GUO Li1, WANG Hongda1,2, LI Xialin1, WANG Chengshan1, FENG Yibin3, ZHU Xiang4
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1.Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China;2.Department of Supply Management, Naval Logistics Academy, Tianjin 300450, China;3.Electric Power Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310014, China;4.China Electric Power Research Institute(Nanjing),Nanjing 210003, China
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| Abstract: |
| In order to reveal the stability mechanism of high-frequency oscillation in DC microgrid from the perspective of equivalent circuit, a reduced-order circuit model of DC microgrid is proposed. The DC voltage control unit is reduced to an equivalent RL series circuit model, by which the influences of droop control, DC voltage control and inner-loop current control on system high-frequency stability can be analyzed quantitatively with equivalent resistance and inductance. Furthermore, the reduced-order circuit model of the whole system is obtained by considering the equivalent RC parallel circuit of constant power load model, on this basis, a high-frequency oscillation stability criterion of DC microgrid is proposed. Moreover, with the proposed reduced-order model, the control parameter impacts of DC voltage control unit on equivalent resistance, equivalent inductance and stability criterion are analyzed comprehensively, by which the reason of high-frequency oscillation in DC microgrid can be revealed from the perspective of equivalent circuit. Eventually, the proposed reduced-order model is verified by simulation in PSCAD/EMTDC software. |
| Key words: DC microgrid high-frequency oscillation equivalent circuit reduced-order modeling stability analysis |
