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Photovoltaic grid-connected generation power balancing control method

A control method and power technology, applied in photovoltaic power generation, single-network parallel feeding arrangements, collectors, etc., can solve problems such as lowering system efficiency and grid operation hazards, and achieve improved system efficiency, stable grid-connected power, and sine degree high effect

Inactive Publication Date: 2017-06-20
韩会义
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AI Technical Summary

Problems solved by technology

However, with the construction of megawatt-level photovoltaic power plants, their scale will continue to increase. When the power generation reaches a certain proportion, power fluctuations will bring harm to the operation of the power grid.
In addition, when the power grid is disconnected due to a fault, the photovoltaic array will stop generating power, reducing system efficiency

Method used

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  • Photovoltaic grid-connected generation power balancing control method
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  • Photovoltaic grid-connected generation power balancing control method

Examples

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Embodiment Construction

[0016] specific implementation plan

[0017] figure 1 Among them, the Boost converter is mainly used to achieve maximum power tracking, and at the same time raise the lower voltage of the photovoltaic array to a higher voltage for use by the three-phase inverter bridge; the three-phase inverter bridge is used to realize grid-connected inverter; by The energy storage system composed of a bidirectional DC / DC converter and a battery is used to realize grid-connected power smoothing control, and to store the energy emitted by the photovoltaic array when the grid fails.

[0018] When the light and temperature are constant, the output voltage of the photovoltaic cell changes with the load, and the output power is the largest at a certain voltage value. This operating point is the maximum power point, and the maximum power point changes with the change of light and temperature. Therefore, in the photovoltaic power generation system, the operating voltage of the photovoltaic array is...

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Abstract

A photovoltaic grid-connected generation power balancing control method is disclosed which includes three parts: maximum power tracking, grid-connected inversion and an energy storage system. The method, based on the maximum power tracking and grid-connected inversion control of photovoltaic power generation, introduces a battery energy storage system to realize a peak-shaving load-shifting and balancing function for generation power. The photovoltaic grid-connected power generation system solves photovoltaic power fluctuation. The system not only achieves the maximum power tracking and grid-connected power generation, but also stabilizes the grid-connected power through the power balancing control. When a power grid is faulted and disconnected, a photovoltaic array can still generate power, stores the power in the battery, and improves system efficiency.

Description

[0001] Technical field [0002] The present invention relates to photovoltaic grid-connected power generation, in particular to a photovoltaic grid-connected power stabilization control method. Background technique [0003] Photovoltaic power generation has no pollution, no noise, and low operating costs. It is an ideal sustainable energy source and has a good development prospect. It is predicted that the proportion of solar energy in the energy structure will reach 13.5% by 2050, and it will be one of the main alternative energy sources for fossil energy in the future. [0004] After years of development, photovoltaic power generation is gradually developing from the past small-scale off-grid system to large-scale grid-connected power generation. Photovoltaic grid-connected power generation technologies based on Maximum Power Point Tracking (MPPT) and various grid-connected inverter controls have been extensively studied. However, due to erratic light and temperature chang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J7/35H02J3/32
CPCY02E10/56Y02E70/30
Inventor 韩会义
Owner 韩会义
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