煤层气抽采直流微网建模与稳定性分析

doi:10.19595/j.cnki.1000-6753.tces.L70010

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Abstract According to the status of power consumption in the field of coal bed methane (CBM) extraction, a novel power supply system of DC microgrid for CBM extraction was set up, and its stability issues and control strategy were also studied. The DC microgrid for CBM extraction has three-level configuration. The first is the power supply level consisting of PV arrays and battery banks. The second is the power transmission and distribution level comprised of bidirectional Buck/Boost converter. The third is the load level including CBM-well pumping units. The output impedance Z_o(s) of the first and second levels was established, as well as the input impedance Z_in(s) in series with the controlled source of the third level. Thereafter, a global small-signal model was derived. Since the system instability will be induced by the dynamical and cyclical load of CBM-well pumping units with negative impedance characteristics, a stability control strategy based on virtual impedance was analyzed and discussed in the second level. Simultaneously, droop control was employed to achieve dynamic load power sharing. The impedance criteria were selected to evaluate the overall system stability with and without this stability control strategy by solving the dominant poles of polynomial 1/(1+Z_o(s)/Z_in(s)). Finally, the DC microgrid model comprised of PV arrays, battery banks and CBM-well pumping units was established in Matlab/Simulink, which verified this method.

Key words： Coal bed methane-well pumping unit, DC microgrid, global small-signal model, virtual impedance, stability analysis

Received: 14 August 2016 Published: 01 August 2017

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TM712

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	Wang Hao
	Wang Cong
	Ma Yong
	Bai Lijun
	Cheng Hong

Cite this article:

Wang Hao,Wang Cong,Ma Yong等. Modeling and Stability Analysis of DC Microgrid for Coal Bed Methane Extraction[J]. Transactions of China Electrotechnical Society, 2017, 32(14): 194-204.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L70010 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I14/194

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