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Two-level type single-phase grid-connected photovoltaic power generation control method

A control method, photovoltaic technology

Inactive Publication Date: 2013-05-08
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a two-stage single-phase photovoltaic grid-connected power generation control method, which solves the problem that the power switch of the BOOST boost converter in the prior art is always in the working state, resulting in a significant increase in switching loss and the overall system efficiency. full play problem

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Embodiment Construction

[0032] refer to figure 1 , which is a block diagram of the photovoltaic grid-connected power generation circuit on which the two-stage single-phase photovoltaic grid-connected power generation control method of the present invention depends. It is sequentially connected with the single-phase inverter circuit 3 and the filter circuit 4, and the filter circuit 4 is connected with the public power grid 5 in parallel.

[0033] The above BOOST boost converter 2 is used as the front stage, and the single-phase inverter circuit 3 is used as the rear stage. The output terminal of the BOOST boost converter 2 is connected to the input terminal of the single-phase inverter circuit 3, and the output of the single-phase inverter circuit 3 The terminal is connected to the input terminal of the filter circuit 4, and the output terminal of the filter circuit 4 is connected to the input terminal of the public grid 5.

[0034] BOOST boost converter 2 selects a classic BOOST boost converter, or...

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Abstract

The invention discloses a two-level type single-phase grid-connected photovoltaic power generation control method aimed at a grid-connected photovoltaic power generation inverter circuit formed by a BOOST converter, a single-phase inverter circuit and a filter. The BOOST converter has two work modes which are a work mode of a BOOST non-work zone and a work mode of a BOOST work zone. The single-phase inverter circuit achieves the function that high-power-factor harmonic current is injected into a power grid through maximum power point tracing outer-ring control and inverter output current inner-ring control. According to the two-level type single-phase grid-connected photovoltaic power generation control method, the BOOST converter does not work for a part of time within a half power grid power frequency circle, so that switching consumption is avoided, and the power of the whole system is further improved.

Description

technical field [0001] The invention belongs to the technical field of solar photovoltaic power generation control, and relates to a two-stage single-phase photovoltaic grid-connected power generation control method. Background technique [0002] Solar energy resources are inexhaustible and inexhaustible. As one of the power generation technologies utilizing solar energy, photovoltaic power generation has developed rapidly. As far as the current technical level is concerned, the output voltage of a single photovoltaic panel is low, and multiple photovoltaic panels need to be connected in series to form a photovoltaic branch, and the same photovoltaic branch is connected in parallel to form a photovoltaic array. The direct current generated by the photovoltaic array can only be converted into alternating current and injected into the grid through the grid-connected inverter. Under the premise of the same output power, the improvement of grid-connected inverter efficiency mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 任碧莹孙向东张琦安少亮宋卫章
Owner XIAN UNIV OF TECH
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