Voltage fluctuation regulation method for distributed photovoltaic energy storage microgrid system

A distributed photovoltaic and voltage fluctuation technology, which is applied in photovoltaic power generation, flexible AC transmission system, and regulation of electrical variables, etc., can solve the problems of increased system investment cost and complex control system, and achieve system investment cost saving and simple and reliable control system , the effect of preventing heat damage

Active Publication Date: 2018-02-06
深圳市欣旺达能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the installation of a large number of additional equipment, the system investment cost is greatly increased, and the control system is also more complicated

Method used

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  • Voltage fluctuation regulation method for distributed photovoltaic energy storage microgrid system
  • Voltage fluctuation regulation method for distributed photovoltaic energy storage microgrid system
  • Voltage fluctuation regulation method for distributed photovoltaic energy storage microgrid system

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Embodiment

[0022] Such as figure 1 As shown, the distributed photovoltaic energy storage microgrid system includes: grid-connected switch, AC bus, photovoltaic DC / AC converter, anti-backflow diode, three-way photovoltaic array, energy storage DC / AC converter, three-way battery Energy storage system, local AC output interface; the three-way photovoltaic array is connected to the photovoltaic DC / AC converter through three anti-backflow diodes, and the photovoltaic DC / AC converter is connected to the AC bus; the three-way battery energy storage system is connected to the The DC / AC converter can be connected to the AC bus, and the AC bus is connected to the external power grid through the grid-connected switch; the AC bus is connected to the local AC output interface before being connected to the grid-connected switch.

[0023] Loads such as parks and schools are connected through local AC output interfaces. The anti-backflow diode is a device that prevents the AC bus current from being rev...

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Abstract

The invention relates to a distributed photovoltaic energy storage microgrid system and a voltage fluctuation adjusting method. A process comprises the following steps: judging whether voltage fluctuates or not, if so, executing a step 2, otherwise, ending control; step 2, judging whether voltage of an AC bus is on the high side or not, if so, executing a step 3, if the voltage of the AC bus is on the low side, executing a step 4; step 3, judging whether a photovoltaic converter runs in a MPPT mode or not, if the photovoltaic converter runs in the MPPT mode, reducing power output; otherwise, performing energy storage converter adjustment; step 4, judging whether the photovoltaic converter runs in the MPPT mode or not, if the photovoltaic converter runs in the MPPT mode, performing energy storage converter adjustment, otherwise, adjusting the photovoltaic converter to output reactive power. With the system and the method provided by the invention, system investment cost is saved greatly, and a control system is also more simple and reliable at the same time.

Description

Technical field: [0001] The invention relates to a distributed power grid, and further relates to a distributed photovoltaic energy storage micro-grid system and a voltage fluctuation regulation method. 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 photovoltaic power generation The process 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 other new pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/32G05F1/66
CPCG05F1/66H02J3/24H02J3/32H02J3/385Y02E10/56Y02E40/10Y02E70/30
Inventor 孙威肖海伟李颖郭均柳姚自良何志超刘明爽王大臣李伟军王明旺
Owner 深圳市欣旺达能源科技有限公司
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