Improved control method for multi-energy storage independent DC microgrid of considering mismatched line resistance
A technology of DC micro-grid and control method, which is applied in the direction of AC network circuit, AC network load balancing, single-network parallel feeding arrangement, etc., and can solve problems such as bus voltage drop
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[0045] The purpose of the present invention is to eliminate the influence of unmatched line impedance on current load distribution, and at the same time realize the reasonable distribution of load current in energy storage units, so that the SOC of each energy storage unit is balanced, and overcharging and overdischarging are avoided. The proposed method does not require line impedance information, and only uses the sample-and-hold to periodically modify the voltage bias, which overcomes the influence of mismatched line impedance, achieves SOC balance, and ensures that the voltage is within a stable range.
[0046] Below, the present invention will be further explained from several aspects such as traditional droop control principle, SOC imbalance analysis, improved droop control strategy design, improved droop control analysis, and simulation verification.
[0047] (1) Traditional droop control principle
[0048] DC microgrid load distribution methods generally use I-U or P-U...
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