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Micro-grid hybrid energy storage system power distribution method based on fuzzy control rules

A hybrid energy storage system and fuzzy control technology, applied in the energy industry, sustainable manufacturing/processing, AC network load balancing, etc., can solve the problems of independent operation of microgrids, such as real-time balance of electricity and less research on voltage stability. Achieving the effect of power balance

Active Publication Date: 2014-12-24
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

Existing research on hybrid energy storage mainly focuses on the control strategy for stabilizing grid-connected power, while there are few studies on real-time power balance and voltage stability of independently operating microgrids.

Method used

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  • Micro-grid hybrid energy storage system power distribution method based on fuzzy control rules
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  • Micro-grid hybrid energy storage system power distribution method based on fuzzy control rules

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Embodiment Construction

[0034] The hybrid energy storage in the independent microgrid controls the power distribution of the main integrated load power among the energy storage units. A variable time constant power distribution strategy based on fuzzy control rules is proposed. According to the state of charge of the energy storage unit, the corresponding fuzzy control rules are formulated, the size of the low-pass filter time constant is appropriately adjusted, and the compensation power value of the battery and supercapacitor is corrected. .

[0035] Power distribution strategy with variable filter time constant based on fuzzy control rules:

[0036] The purpose of power distribution is to realize the power balance of the system, and calculate the power value that the hybrid energy storage system needs to stabilize according to the power demand of the load and the power output of the distributed power supply. Then, according to the charging and discharging characteristics of the battery and the su...

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Abstract

The invention relates to a micro-grid hybrid energy storage system power distribution method based on fuzzy control rules. A power distribution strategy of variable-filter time constant in a micro-grid hybrid energy storage system is achieved. The micro-grid hybrid energy storage system power distribution method regulates the time constant of a low pass filter according to a charge state of an energy storage unit, dynamically regulates charging and discharging power of the energy storage unit, enables the charge state of the energy storage unit to be kept in a certain range, avoids overcharging and over-discharging of the energy storage unit and facilitates power balance of the micro-grid hybrid energy storage system.

Description

technical field [0001] The invention relates to a microgrid control method, in particular to a method for power distribution of a microgrid hybrid energy storage system based on fuzzy control rules. Background technique [0002] In order to ensure the stability of microgrid operation and maintain real-time power supply balance, it is necessary to control the hybrid energy storage system reasonably. Microgrid power distribution as figure 1 shown. The energy storage units (battery and supercapacitor) in the system are connected to the DC bus through a buck / boost power converter to realize bidirectional flow of power. [0003] At present, research on the control strategy of microgrid energy storage system has been carried out at home and abroad. Chen Yizhe proposed an active control strategy for the microgrid energy storage system based on short-term load forecasting. Considering the battery capacity and the limit of charge and discharge times, according to the load forecast...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32
CPCY02P80/14
Inventor 彭道刚张浩钟永于会群钱玉良李辉夏飞范俊辉
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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