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Energy management method applied to photovoltaic energy storage system

A photovoltaic energy storage and energy management technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, electric vehicles, etc., can solve the problems of inability to realize intelligent photovoltaic energy storage system, low degree of automation, low energy utilization rate, etc. Achieve the effect of improving utilization rate and automatic control effect

Active Publication Date: 2017-05-17
JIAXING ZHISHENG KITCHENWARE MFG CO LTD
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AI Technical Summary

Problems solved by technology

The above-mentioned management methods have low energy utilization rate and low degree of automation, and cannot realize an intelligent photovoltaic energy storage system

Method used

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  • Energy management method applied to photovoltaic energy storage system
  • Energy management method applied to photovoltaic energy storage system
  • Energy management method applied to photovoltaic energy storage system

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Embodiment Construction

[0018] see figure 1 It can be seen that this system contains three power sources: photovoltaic modules, lithium batteries and power grid. Among them, the photovoltaic module is connected to the DC bus through the photovoltaic measuring converter, the lithium battery is connected to the DC bus through the battery-side converter, the DC bus is connected to the load through the full-bridge inverter, and the power grid is connected to the wire between the load and the full-bridge inverter.

[0019] The Boost converter on the photovoltaic side can work in Maximum Power Point Tracking (MPPT) mode and Constant Voltage (CV) mode; the Buck-Boost converter on the battery side can work in Boost mode and Buck mode; when it works In Buck mode, it controls the low-voltage side voltage for battery discharge; when it works in Boost mode, it controls the high-voltage side voltage for battery charging. When the grid is connected to the photovoltaic energy storage system, the full-bridge invert...

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Abstract

The invention discloses an energy management method applied to a photovoltaic energy storage system. Power supplies in the photovoltaic energy storage system include a photovoltaic assembly, a lithium battery and a power grid. Working conditions of the photovoltaic energy storage system include conditions of 1, photovoltaic power generation during island operation: when output power of the photovoltaic assembly is larger than load power and the lithium battery is not charged fully, executing the mode; 2, conversion of grid side converters during grid-connected operation: when the output power of the photovoltaic assembly is larger than the load power and the lithium battery is charged fully, executing the mode; 3, power supply through the battery during island operation: when the output power of the photovoltaic assembly is insufficient to supply power to a load and the lithium battery has electricity, executing the mode; 4, rectification of the grid side converters during grid-connected operation: when the output power of the photovoltaic assembly is insufficient to supply power to the load and the lithium battery runs low, executing the mode. By means of the automatic control energy management method, access photovoltaic energy, energy of the battery and energy of the power grid of the photovoltaic energy storage system are utilized in sequence, and therefore, the utilization rate of light energy and automatic control effect can be increased.

Description

technical field [0001] The invention relates to the field of photovoltaic energy storage, in particular to a method for managing energy in a photovoltaic energy storage system. Background technique [0002] The core purpose of the photovoltaic energy storage system energy management strategy is to enable the entire photovoltaic power generation system to operate in a coordinated and stable manner to achieve energy balance and optimization. This system contains three power sources, namely: photovoltaic modules, lithium batteries and power grid. To determine the system working condition and energy management strategy, the control principle of energy management should be clarified first, that is, the priority of energy use during system operation. Considering that more and more countries are encouraging the self-use of distributed energy resources and following this principle, photovoltaic modules are the first priority in the selection of power supply. In the case of a surpl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/35H02J3/38
CPCY02E10/56
Inventor 蔡旭王海松姜广宇叶程广丁卓禹何小春
Owner JIAXING ZHISHENG KITCHENWARE MFG CO LTD
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