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An optical storage grid-connected control method and a device for smoothing photovoltaic power fluctuation

A power fluctuation and control method technology, applied in photovoltaic power generation, circuit devices, reducing/preventing power oscillation, etc., can solve problems such as power grid fluctuations, and achieve the effect of stabilizing power fluctuations

Active Publication Date: 2019-01-18
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a photovoltaic power storage grid-connected control method and device for smoothing photovoltaic power fluctuations, which are used to solve the problem of large grid fluctuations in the grid-connected mode of the existing photovoltaic-storage hybrid microgrid system

Method used

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  • An optical storage grid-connected control method and a device for smoothing photovoltaic power fluctuation
  • An optical storage grid-connected control method and a device for smoothing photovoltaic power fluctuation
  • An optical storage grid-connected control method and a device for smoothing photovoltaic power fluctuation

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Embodiment 1

[0035] The solar-storage grid-connected control method for stabilizing photovoltaic power fluctuations in this embodiment includes the following steps: collecting the grid-connected voltage of the solar-storage hybrid microgrid system, and judging that the solar-storage hybrid microgrid system is in a normal grid-connected state according to the range of the grid-connected voltage mode or low-voltage grid-connected mode.

[0036] When the grid-connected voltage of the optical-storage hybrid micro-grid system is greater than or equal to the first set value and less than or equal to the second set value, it is determined that the optical-storage hybrid micro-grid system is in the normal grid-connected mode, and the DC / AC converter is The first constant voltage control, the voltage outer loop is given by the DC bus voltage value U DCref and the actual collected DC bus voltage value U DC Make a difference, the difference will output the active given current value through the PI c...

Embodiment 2

[0055] The difference between this embodiment and the above-mentioned embodiments is that this embodiment also includes fine-grained control of the scheduling grid-connected mode, such as Figure 12 shown.

[0056] When the grid-connected voltage of the photovoltaic-storage hybrid microgrid system is greater than or equal to the first set value and less than or equal to the second set value, if there is a dispatch command, it is judged that the photovoltaic-storage power generation system is in the dispatch grid-connected mode, and the DC / AC The converter performs scheduling operation control. When receiving the output command of the superior scheduling system, the active output P can be set according to the requirements. ref and reactive output Such as Figure 13 Shown; MPPT control is still performed on the photovoltaic DC / DC converter, such as image 3 As shown; the lithium battery DC / DC converter is controlled to stabilize the DC bus voltage, that is, the third constan...

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Abstract

The invention relates to a photovoltaic storage grid-connected control method and device for smoothing photovoltaic power fluctuation. The method comprises the following steps: 1) collecting grid-connected voltage of an optical storage hybrid microgrid system; 2) when that grid-connected voltage is great than or equal to the first set value and less than or equal to the second set value, judging that it is in a normal grid-connected mode, performing a certain voltage control on DC / AC, performing MPPT control on photovoltaic DC / DC, performing a first filter leveling control on battery DC / DC, and performing hot standby control on super capacitor DC / DC; 3) when that grid-connected voltage is low than the first set value, it is judging that it is in the low-voltage grid-connected mode, whereinthe DC / AC is subjected to reactive power setting control and current limiting control, the photovoltaic DC / DC is subjected to power limiting control, the battery DC / DC is subjected to hot standby control, and the super capacitor DC / DC is subjected to a second constant voltage control. The fine control of DC / AC, photovoltaic DC / DC, battery DC / DC and super capacitor DC / DC in normal grid-connected mode and low voltage grid-connected mode of the invention effectively suppresses power fluctuation in grid-connected mode of an optical storage hybrid micro-grid system.

Description

technical field [0001] The invention belongs to the technical field of solar-storage grid-connected control, and in particular relates to a solar-storage grid-connected control method and device for smoothing photovoltaic power fluctuations. Background technique [0002] In recent years, the installed capacity of new energy sources such as photovoltaics and wind power has grown unprecedentedly. However, due to the inherent volatility, randomness, and unschedulability of distributed power generation, it poses challenges to the stability of the grid, and grid-connected power quality problems have emerged. A series of problems such as poor energy consumption and difficulty in consumption limit the high penetration rate access and effective utilization of distributed power generation. [0003] In response to the above-mentioned problems encountered in the development of distributed energy, energy storage has brought us the dawn. Energy storage can be used as a load to charge dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32H02J3/24
CPCH02J3/383H02J3/24H02J3/32Y02E10/56Y02E70/30
Inventor 郭宝甫王卫星刘志远曹新慧徐军卢星海岳帅谢青松苑军军王法宁陈玉玺
Owner XUJI GRP
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