DC micro grid hybrid energy storage system hierarchical control method

A technology of hybrid energy storage system and DC micro-grid, which is applied in the direction of load balance, parallel operation of DC power supply, collectors, etc. in the DC network, to achieve the effect of prolonging the service life, reducing the number of charging and discharging, and improving the utilization efficiency

Inactive Publication Date: 2018-11-13
NANJING UNIV OF SCI & TECH
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  • DC micro grid hybrid energy storage system hierarchical control method
  • DC micro grid hybrid energy storage system hierarchical control method
  • DC micro grid hybrid energy storage system hierarchical control method

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[0019] With reference to the accompanying drawings, a hierarchical control method for a hybrid energy storage system of a DC microgrid according to the present invention includes the following steps:

[0020] Step 1. Build a DC micro-grid system, which includes a distributed power generation unit photovoltaic array, a hybrid energy storage unit, a DC load, and a grid-connected converter; the distributed unit uses a photovoltaic power generation unit, and the hybrid energy storage device consists of a supercapacitor and a lithium battery Composition, each component unit is incorporated into the DC microgrid through the corresponding converter.

[0021] Step 2. Use supercapacitors and lithium batteries to form a hybrid energy storage system HESS, and coordinate and cooperate in the corresponding layer area; at the same time, realize automatic response through droop control without relying on mutual communication; the terminal voltage of the supercapacitor can represent itself en...

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Abstract

The invention discloses a DC micro grid hybrid energy storage system hierarchical control method comprising the following steps: 1, building a DC micro grid system structure that includes a distributed generating unit photovoltaic array, a hybrid energy storage unit, a DC load and a grid connected converter; 2, using a super capacitor and a lithium battery to form the hybrid energy storage system,and carrying out coordination cooperation in corresponding layers; 3, deriving a relation between DC bus voltage changes and a system power flow direction according to a DC micro grid system power equation, a bus capacitance energy storage change and voltage change equation; 4, dividing the system operation control into 5 layers according to DC bus voltage fluctuation sizes, wherein each operation layer has a converter as a balance point so as to adjust the DC bus voltage, thus ensuring the system power balance. The hierarchical coordination control strategy can reasonably use the clean energy formed by the distributed power supply and energy storage equipment, thus improving the energy utilization efficiency.

Description

technical field [0001] The invention belongs to the field of smart grids, and in particular relates to a hierarchical control method for a DC micro-grid hybrid energy storage system. Background technique [0002] In recent years, with the increasingly prominent energy demand and environmental problems, distributed power generation based on clean energy has received extensive attention, and microgrids have also emerged as a result. Most of the microgrids are AC-based, but the DC microgrid system has simple structure, small energy conversion, and high power supply quality, which has more advantages than AC microgrids. With the development of power distribution system, people pay more and more attention to it. Due to the intermittent and random nature of renewable energy output power, energy storage systems have become an important link in DC microgrids and have important research significance. Batteries have high energy density and are widely used in energy storage devices. ...

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Application Information

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IPC IPC(8): H02J1/10H02J1/14H02J7/34
CPCH02J1/10H02J1/14H02J7/345
Inventor 张丹丹袁健李超王森朱建威
Owner NANJING UNIV OF SCI & TECH
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