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Off-grid and grid-connected operation light and storage joint power supply system

A power supply system and battery system technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, energy storage, etc. Clarify control strategies and other issues to achieve the effect of improving energy exchange efficiency, overcoming unstable power supply quality, and light weight

Active Publication Date: 2014-09-17
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The title of the patent is "a large-capacity off-grid solar-storage power generation system", which proposes the idea of ​​using photovoltaic energy storage combined power supply in the off-grid state, and does not give a clear control strategy, and lacks protection strategies for photovoltaic modules and energy storage devices , easily lead to problems such as unstable power supply quality and poor dispatchability of the photovoltaic power supply system

Method used

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  • Off-grid and grid-connected operation light and storage joint power supply system
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  • Off-grid and grid-connected operation light and storage joint power supply system

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Embodiment Construction

[0048]The present invention will be further described below in conjunction with accompanying drawing.

[0049] Such as figure 1 as shown, figure 1 It is the topological structure of the light-storage combined power supply system suitable for off-grid and grid-connected operation in this embodiment; the system includes a photovoltaic array, an anti-backflow diode, a photovoltaic DC / DC converter, a lithium-ion battery energy storage system, and an energy storage bidirectional DC / DC converter, DC bus, DC / AC converter and AC bus.

[0050] The DC bus is connected to the AC bus through a DC / AC converter, and the AC bus is connected to the power grid through a switch. The AC bus and the DC bus are respectively connected to the AC load and the DC load, and the DC bus and the AC bus provide electric energy to the DC load and the AC load respectively.

[0051] The photovoltaic modules in the photovoltaic array are connected to the input terminals of the photovoltaic DC / DC converter ...

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Abstract

The invention provides an off-grid and grid-connected operation light and storage joint power supply system which comprises a DC / AC converter for connecting a direct current bus and an alternating current bus. The alternating current bus is connected with a power grid. The alternating current bus and the direct current bus are connected with an alternating current load and a direct current load respectively. The direct current bus is connected with a photovoltaic array and a battery system through a photovoltaic DC / DC converter and an energy storage DC / DC converter respectively. According to the off-grid and grid-connected operation light and storage joint power supply system, control strategies of the off-grid and grid-connected operation light and storage joint power supply system are provided and include the off-grid state operation control strategy and the grid-connected state operation control strategy. By means of the system and a method, the defects that an existing photovoltaic power supply system is instable in power supply quality, poor in schedulability, single in operation mode, low in energy conversion efficiency and the like are overcome.

Description

technical field [0001] The invention relates to a system in the field of photovoltaic power generation, in particular to an off-grid and grid-connected combined power supply system for photovoltaics and storage. Background technique [0002] Solar energy resources have no geographical restrictions, are widely distributed and inexhaustible. Solar cell modules are simple in structure, small in size, light in weight, easy to transport and install, short construction period of photovoltaic power generation system, and can be large or small according to power load capacity, convenient and flexible, easy to combine and expand; at the same time, solar The process of photovoltaic power generation has no mechanical rotating parts, does not require cooling water and does not consume fuel, and does not emit any substances including greenhouse gases. It has the characteristics of no noise, no pollution, stable and reliable performance, and long service life. Therefore, compared with ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/28
CPCY02E70/30Y02E10/563Y02E10/566Y02E10/56
Inventor 谢志佳李建林徐少华房凯惠东
Owner STATE GRID CORP OF CHINA
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