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Energy coordination control method of off-grid direct-current microgrid

A DC micro-grid, energy coordination technology, applied in the direction of load balancing in DC network, DC circuit above three wires, parallel operation of DC power supply, etc. The effect of power balance

Pending Publication Date: 2020-11-06
NINGBO ELECTRIC POWER DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Photovoltaic power generation produces direct current, which can save the rectification link in the DC micro-grid, and has strong applicability to the DC micro-grid, but it has relatively low conversion rate of power generation, energy dispersion, high cost, and is affected by climate and geographical conditions. Large and other characteristics, usually need access to wind power as energy supplement

Method used

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  • Energy coordination control method of off-grid direct-current microgrid
  • Energy coordination control method of off-grid direct-current microgrid
  • Energy coordination control method of off-grid direct-current microgrid

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Embodiment 1

[0081] The specific parameters for setting photovoltaic power generation unit, wind power generation unit, energy storage unit and load unit are as described in Table 1, as follows:

[0082] Table 1 DC microgrid unit parameter list

[0083]

[0084]

[0085] Such as Figure 8 to Figure 15 As shown, at 0-1s, ignoring the rising stage of the DC bus voltage, the load terminal 4 stabilizes the voltage to about 0.3kV through the H-bridge Buck / Boost converter. With the continuous increase of the voltage, the DC bus voltage reaches 0.523kV , in order to avoid overheating and damage to equipment caused by continuous voltage rise, the working mode of wind power generation device 3 and photovoltaic power generation device 2 will be switched from the MPPT state to the droop control state. The droop coefficient K of the device pv is 1.53, the droop coefficient K of the wind power converter w is 0.44, the energy storage device 5 works in the state of constant current charging, and...

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Abstract

The invention relates to an energy coordination control method of an off-grid direct-current microgrid. The direct-current microgrid is provided with a photovoltaic power generation unit, a wind powergeneration unit, an energy storage unit and a load unit. The direct-current microgrid is divided into a plurality of working modes according to the grade of the direct-current bus voltage, in each working mode, one or more units of the photovoltaic power generation unit, the wind power generation unit, the energy storage unit and the load unit are used for adjusting the voltage of a direct-current bus and keeping the power balance, when the direct-current microgrid is switched between the working modes, the photovoltaic power generation unit, the wind power generation unit, the energy storageunit and the load unit are switched to the corresponding working modes, and plug and play of the direct-current microgrid under the off-grid condition is achieved. Compared with the prior art, the method has the advantages that the method can still work normally without communication to achieve plug and play, the dynamic characteristics of the direct-current microgrid are improved, the system robustness is improved, and the stability of the direct-current voltage is maintained.

Description

technical field [0001] The invention relates to the field of energy coordinated control of DC microgrids, in particular to an energy coordinated control method for off-grid DC microgrids. Background technique [0002] At present, among various forms of micro-grids, DC micro-grids have the advantages of solving distributed energy consumption, facilitating the access of DC power equipment, adapting to various energy storage devices, and having strong transmission capabilities. The DC microgrid is a DC multi-power network formed by a variety of distributed energy sources, loads, energy storage devices, and corresponding interface converters. Usually, wind power generation, photovoltaic power generation, and fuel cells are the main distributed energy sources in DC microgrids, which have the characteristics of energy saving, environmental protection, small capacity, and plug-and-play. [0003] Photovoltaic power generation produces direct current, which can save the rectificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J1/08H02J1/10H02J1/14H02J7/34H02J7/35
CPCH02J1/00H02J1/10H02J1/082H02J1/001H02J1/106H02J1/14H02J7/345H02J7/35H02J2300/26H02J2300/28H02J2207/50H02J2300/40Y02E10/56Y02E10/76
Inventor 姚艳舒恺钱凯余萃卓刘峰钱康黄炜裴梓翔刘玉婷
Owner NINGBO ELECTRIC POWER DESIGN INST
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