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| Stability analysis and research of DC microgrid based on improved adaptive drooping |
| Yu Lili1, Zhang Zhaoyun2, Liu Yitao1 |
1. School of Mechanical and Control Engineering, Shenzhen University, Shenzhen, Guangdong 518000;
2. School of Electronic Engineering, Dongguan University of Technology, Dongguan, Guangdong 523000 |
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Abstract In the DC microgrid, various distributed energy sources (photovoltaics, fans, energy storage units, etc.) are connected in parallel to the DC bus through inverters. Therefore, it is important to maintain the stability of the DC bus voltage and coordinate the energy management of the system. Since the impedance values of the distributed micro-power supplies in the DC microgrid to the AC/DC loads are not necessarily equal, here we assume the impedance values of the lines as virtual droop coefficients, which inevitably leads to the power output of each distributed micro-source relative to the load. Cannot be allocated as needed. Moreover, the power variation of the load causes the bus voltage to increase or decrease, which inevitably causes the DC bus voltage in the DC microgrid to fluctuate, affecting the stability of the entire system. Based on the above various factors, here we can adopt a method based on improved adaptive droop control, which takes into account the influence of line impedance and load fluctuations, and the mean value of voltage and current output through the converter. To equalize the output voltage and current value of each converter, the fluctuation range of the DC bus voltage value is reduced, and the current voltage distribution accuracy of each converter is indirectly improved. The modeling and simulation are carried out in combination with Matlab/Simulink. The simulation results can effectively verify the rationality of the proposed improved adaptive droop control strategy.
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Received: 06 November 2019
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| Cite this article: |
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Yu Lili,Zhang Zhaoyun,Liu Yitao. Stability analysis and research of DC microgrid based on improved adaptive drooping[J]. Electrical Engineering, 2020, 21(5): 28-32.
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| URL: |
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http://dqjs.cesmedia.cn/EN/Y2020/V21/I5/28
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2020, Vol. 21 
