Direct-current microgrid system and energy management method thereof

A technology of DC micro-grid and DC bus, which is applied in electric vehicles, electrical components, transportation and packaging, etc. It can solve the problems of high cost and difficult control, and achieve the effect of satisfying uninterrupted power supply and optimizing the operation of DC micro-grid

Inactive Publication Date: 2013-02-06
深圳微网能源管理系统实验室有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing DC micro-grid system is still in the stage of modeling and simulation and the implementation of low-power experimental systems. When switching between island operation and grid-connected operation, there are mostly gap switching, which cannot meet the reliable power requirements of key loads including telecom data centers. If you want to achieve seamless switching, the cost is high and the control is difficult

Method used

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  • Direct-current microgrid system and energy management method thereof

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Embodiment Construction

[0039] The present invention will be described below in combination with specific embodiments and with reference to the accompanying drawings.

[0040] A DC microgrid system as shown in the accompanying drawing, comprising

[0041] Three power generation units: user-side large power grid 1 and its grid-connected AC / DC2 with a capacity of 30kW, lithium iron phosphate energy storage system 3 and its energy storage DC / DC4, and photovoltaic power generation system 5 and its photovoltaic DC / DC6, phosphoric acid The iron-lithium energy storage system 3 includes an energy storage battery with a capacity of 20kW×2 hours, which is used to stabilize the power fluctuations generated by the photovoltaic power generation system 5 and extend the power supply to the load during island operation. The photovoltaic power generation system 5 uses 10kW photovoltaic monocrystalline silicon Batteries are used to make full use of solar energy for environmental protection and energy saving;

[0042]...

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Abstract

The invention provides a direct-current (DC) microgrid system and an energy management method thereof. A power generation unit comprises a large user-side power grid and a grid-connected alternating current / direct current converter (AC / DC) thereof, a lithium iron phosphate energy storage system (EMS) and an energy storage direct current / direct current converter (DC / DC), and a photovoltaic power generation system and a photovoltaic DC / DC thereof. The DC microgrid system is provided with EMS and a wireless sensor network thereof, wherein the wireless sensor network is communicated with the grid-connected, energy storage and photovoltaic DC / DC; the EMS is used for executing different control strategies and optimizing the operation of a DC microgrid; the voltage of a DC busbar is stabilized by controlling a DC busbar voltage outer loop and an output inductive current inner loop through the grid-connected AC / DC when a grid-connected operation is switched to an islanding operation; and the islanding operation is switched to an operation using the energy storage DC / DC as a voltage source, i.e. the voltage stability of the DC busbar is maintained by controlling the DC busbar voltage outer loop and the inductive current inner loop on the energy storage side of a battery within the time of at most 20ms. Therefore, a seamless switching requirement is met, uninterrupted power supply (UPS) of loads in a telecom data center is realized, and configuration of reactive-load compensation equipment is avoided.

Description

technical field [0001] The invention relates to a microgrid system, in particular to a DC microgrid system and an energy management method thereof. Background technique [0002] Microgrid is an organizational form of distributed generation (abbreviated as DG), which consists of distributed power, energy storage devices, energy conversion devices, related loads and monitoring systems, and protection devices. The system can realize self-control, protection and management, and can operate in parallel with the external power grid or in isolation. The existing DC micro-grid system is still in the stage of modeling and simulation and the implementation of low-power experimental systems. When switching between island operation and grid-connected operation, there are mostly gap switching, which cannot meet the reliable power requirements of key loads including telecom data centers. If seamless switching is to be realized, the cost is high and the control is difficult. Contents of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/35
Inventor 秦毅
Owner 深圳微网能源管理系统实验室有限公司
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