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Reactive compensation method and device for photovoltaic grid connected inverter, and photovoltaic grid connected inverter

An inverter and power compensation technology, applied in the field of new energy power electronic control, can solve problems such as cost increase and capacity waste, and achieve the effect of solving capacity waste and cost increase

Inactive Publication Date: 2018-01-16
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the above-mentioned problems existing in the prior art, embodiments of the present invention provide a reactive power compensation method and device for photovoltaic grid-connected inverters and a photovoltaic grid-connected inverter, which can realize active power output mode and reactive power compensation The automatic switching of the mode effectively solves the problems and defects of capacity waste and cost increase introduced by the reactive power compensation device of the photovoltaic power station

Method used

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  • Reactive compensation method and device for photovoltaic grid connected inverter, and photovoltaic grid connected inverter
  • Reactive compensation method and device for photovoltaic grid connected inverter, and photovoltaic grid connected inverter
  • Reactive compensation method and device for photovoltaic grid connected inverter, and photovoltaic grid connected inverter

Examples

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no. 1 example

[0078] Embodiments of the present invention provide a reactive power compensation method for photovoltaic grid-connected inverters, such as figure 1 As shown, the method includes:

[0079] Step 101: When the photovoltaic grid-connected inverter is in an active power output mode, obtain first output state information of photovoltaic cells.

[0080] The reactive power compensation method of the photovoltaic grid-connected inverter in the embodiment of the present invention is applied to the photovoltaic grid-connected inverter. Among them, the photovoltaic grid-connected inverter is in the active power output mode during the day, converting the electric energy of the photovoltaic cell into a sinusoidal current with the same frequency and phase as the grid; at night, it is in the reactive power compensation mode, providing the grid with the required reactive power at night work power.

[0081] Wherein, when the photovoltaic grid-connected inverter is in the active power output ...

no. 2 example

[0136] Embodiments of the present invention provide a reactive power compensation device for photovoltaic grid-connected inverters, such as Figure 8 As shown, the device 800 includes:

[0137] The first obtaining module 801 is used to obtain the first output state information of the photovoltaic cell when the photovoltaic grid-connected inverter is in the active power output mode;

[0138] A first judging module 802, configured to judge whether the first output state information satisfies a first switching condition;

[0139] A first switching module 803, configured to switch the photovoltaic grid-connected inverter from the active power output mode to the reactive power compensation mode when the first output status information satisfies the first switching condition;

[0140] A second acquiring module 804, configured to acquire second output state information of the photovoltaic cell when the photovoltaic grid-connected inverter is in a reactive power compensation mode;

...

no. 3 example

[0164] An embodiment of the present invention provides a photovoltaic grid-connected inverter, including the reactive power compensation device of the above-mentioned photovoltaic grid-connected inverter.

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Abstract

The invention provides a reactive compensation method and device for a photovoltaic grid connected inverter, and the photovoltaic grid connected inverter. The method comprises the steps: obtaining first output state information of a photovoltaic cell when the photovoltaic grid connected inverter is in an active power output mode; judging whether the first output state information meets a first switching condition or not; switching the mode of the photovoltaic grid connected inverter to a reactive power compensation mode from the active power output mode when the first output state informationmeets the first switching condition; obtaining second output state information of the photovoltaic cell when the photovoltaic grid connected inverter is in the reactive power compensation mode; judging whether the second output state information meets a second switching condition or not; and switching the mode of the photovoltaic grid connected inverter to the active power output mode from the reactive power compensation mode when the second output state information meets the second switching condition. According to the scheme of the invention, the method effectively solves problems that a photovoltaic power station reactive power compensation device causes the waste of capacity and the increase of cost.

Description

technical field [0001] The invention relates to the technical field of new energy power electronic control, in particular to a reactive power compensation method and device for a photovoltaic grid-connected inverter and a photovoltaic grid-connected inverter. Background technique [0002] The loads of photovoltaic power station projects are mostly inductive loads. A large number of inductive loads not only cause the system power factor to be too low, reduce production efficiency, and increase the power expenditure of the enterprise, but also cause voltage fluctuations in the grid, which will affect the safe operation of the load equipment and bring unnecessary economic losses to the enterprise. . According to the "Technical Regulations for Connecting Photovoltaic Power Stations to the Grid of the State Grid Corporation of China", the power factor of large and medium-sized photovoltaic power stations should be continuously adjustable within the range of 0.98 (advance) to 0.9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCH02J3/18H02J3/38Y02E10/56Y02E40/30
Inventor 戴志威魏学海唐弘扬陈景熙
Owner ZTE CORP
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