Method and device for inhibiting photovoltaic generation output power fluctuation

A technology of output power and photovoltaic power generation, applied in the field of solar photovoltaic

Inactive Publication Date: 2013-10-02
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a simple system that can effectively solve the problem of large power fluctuations of photovoltaic power generation and non-adju

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  • Method and device for inhibiting photovoltaic generation output power fluctuation

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Embodiment Construction

[0012] The connection structure of each part of the device is as follows: figure 1 As shown, more than one set of photovoltaic array components 1 are connected in series and paralleled to charge the energy storage device 3 through the DC / DC charging device 2 , and then convert it into AC power through the bidirectional inverter 4 to supply power to the grid load 5 .

[0013] The specific power supply methods are as follows:

[0014] At night or during a set time period, the energy storage device 3 is charged through the bidirectional inverter 4 by using the energy of the power grid, making full use of the peak-valley electricity price difference, and playing a role in peak-shaving and valley-filling of the power grid until the energy storage device 3, that is, the battery is fully charged. After charging, charging stops.

[0015] When the photovoltaic array component 1 outputs energy, and the energy emitted by the photovoltaic array component 1 is greater than the energy requ...

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Abstract

The invention discloses a method and a device for inhibiting photovoltaic generation output power fluctuation. The method comprises the steps as follows: connecting photovoltaic array assemblies in series or in parallel, charging an energy storage device through a DC/DC (direct current/direct current) charging device, converting energy into an alternating-current power supply through a bidirectional converter, and supplying the power supply to a load; and at night or in the absence of sunlight, charging the energy storage device through the DC/AC bidirectional converter by electric energy of a power grid during the period that the valley electricity price of the power grid is cheap so as to achieve a peak load shifting effect of the power grid. A principle is that the photovoltaic output power is stabilized by the capacity of the energy storage device to guarantee stable output power, improve power supplying reliability and output the electric energy with qualified quality to a user. The energy generated by photovoltaic generation is stored at first and then converted into the alternating-current power supply through the bidirectional converter, and the power supply is supplied to the load; and under the circumstance that the energy storage capacity is full, a controller is switched to a floating charge mode, the power supply is directly supplied to the load, and the stored energy serves as a supplement.

Description

technical field [0001] The invention relates to a method and a device for suppressing output power fluctuations of photovoltaic power generation, and belongs to the technical field of solar photovoltaics. Background technique [0002] At present, solar photovoltaic power generation systems can be divided into grid-connected methods: off-grid power generation systems and grid-connected power generation systems. According to the bus form, there are two ways: DC bus and AC bus. The DC bus mode is that the photovoltaic array components are first collected into the DC bus, and then converted into AC power by a DC / AC inverter to supply the load. The AC bus mode is that the photovoltaic array components are converted into AC power by the DC / AC inverter and collected to the AC bus, and then supplied to the load. At present, photovoltaic power generation adopts the maximum power point tracking technology (MPPT) to realize the maximum utilization of solar energy, but it does not have...

Claims

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Application Information

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IPC IPC(8): H02J3/32
CPCY02E10/56Y02E70/30
Inventor 文贤馗曾华荣陈仕军刘君徐梅梅
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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