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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

Active Publication Date: 2018-09-28
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the influence of line impedance on current load distribution cannot be completely eliminated, and the control parameter k D needs to be large enough, which is bound to cause a certain degree of bus voltage drop

Method used

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  • Improved control method for multi-energy storage independent DC microgrid of considering mismatched line resistance
  • Improved control method for multi-energy storage independent DC microgrid of considering mismatched line resistance
  • Improved control method for multi-energy storage independent DC microgrid of considering mismatched line resistance

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Embodiment

[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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Abstract

The invention relates to an improved control method for a multi-energy storage independent DC microgrid of considering mismatched line resistance for achieving SOC balancing of various battery energystorage units in the microgrid. The improved control method is characterized by comprising the following steps of (1) adding multiple groups of battery energy storage units which are connected in parallel and are equal in capacity to a DC bus in a DC microgrid structure; (2) building an improved droop control model for the multi-energy storage independent DC microgrid of considering the mismatchedline resistance; and (3) feeding differences between an ESOC average value and an output current average value in a current sampling period and current ESOC values and output current values of the battery energy storage units into a sampling holder separately according to the improved droop control model and then modifying a reference voltage offset in real time according to the output result ofthe sampling holder, thereby achieving SOC balancing of the battery energy storage units. Compared with the prior art, the improved control method has the advantages of considering the mismatched lineresistance and avoiding over-charging and over-discharging.

Description

technical field [0001] The invention relates to the technical field of optimization strategy design for microgrid droop control, in particular to an improved control method for a multi-energy storage independent DC microgrid considering mismatched line resistance. Background technique [0002] With the aggravation of energy and environmental problems worldwide, microgrids have received extensive attention from scholars from all over the world. DC microgrid does not consider the problems existing in AC microgrid such as reactive power, harmonic current, DC / AC conversion loss, etc., so the research on DC microgrid is gradually increasing. Due to the intermittent and random characteristics of distributed generation (DistributedGeneration, DG) output power, its security and reliability are weak. Therefore, a battery energy storage system (BESS) composed of a battery energy storage unit (BESU) needs to be added to ensure the power balance of the microgrid. [0003] When multipl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/38
CPCH02J3/383H02J3/32H02J2203/20Y02B10/10Y02E10/56
Inventor 米阳蔡杭谊符杨何星塘李振坤韩云昊季亮陈鑫
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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