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Maximum power tracking device of photovoltaic grid-connected inverter control system

A technology for maximum power tracking and control systems, applied in control/regulation systems, irreversible DC power input to AC power output, and conversion equipment without intermediate conversion to AC, which can solve low efficiency, error-prone, troublesome, etc. problem, to achieve the effect of improving work efficiency

Pending Publication Date: 2022-07-15
KUNSHAN TYSEN KLD PHOTOELECTRIC TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

However, manual selection of the MPPT tracking method is very cumbersome, inefficient and error-prone
At present, there is no relevant technology to disclose how to realize automatic tracking and use as few MPPT computing resources as possible to increase the total output power of multi-channel photovoltaic strings

Method used

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Embodiment Construction

[0008] The photovoltaic array involved in the present invention mainly includes an energy conversion device that converts light energy into electric energy based on the photovoltaic effect generated by receiving sunlight on the semiconductor PN junction.

[0009] The photovoltaic grid-connected inverter control system involved in the present invention includes principles such as figure 1 The shown is based on a two-stage structure; the front-stage DC-DC boost circuit works under the input voltage closed-loop control mode to realize the maximum power point tracking (MPPT) of the photovoltaic array, and the latter-stage DC-AC inverse The inverter circuit tracks the grid voltage through a phase-locked loop, and controls the grid-connected current to be in the same frequency and phase as the grid voltage to achieve pure active grid connection, so that the output of the photovoltaic system can meet the needs of the grid.

[0010] The maximum power tracking device of the photovoltai...

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Abstract

The invention relates to a maximum power tracking device of a photovoltaic grid-connected inverter control system. The maximum power tracking device is provided with an MPPT module of a photovoltaic string port, a voltage regulator and a current regulator. And the matching relation of the multi-path photovoltaic string connected with the MPPT line is re-determined by comparing a plurality of open-circuit voltages of the multi-path photovoltaic string connected with the MPPT line with the voltages of a plurality of maximum power points, and the multi-path photovoltaic string connected with the MPPT line is switched between a working state and a standby state. The method can flexibly and intelligently select the tracking mode of a plurality of MPPT to the multi-path photovoltaic module, achieves the maximum power tracking of the multi-path photovoltaic module, and improves the working efficiency of a photovoltaic grid-connected inverter.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a maximum power tracking device of a photovoltaic grid-connected inverter control system. Background technique [0002] In order to solve the problems of traditional energy consumption and environmental pollution, photovoltaic power generation has achieved unprecedented development in the world. However, the photoelectric conversion efficiency of photovoltaic cells is very limited. In addition to being affected by its own internal characteristics, it is also easily affected by the external environment (such as light intensity, temperature) and load. In order to improve the power generation efficiency, maximum power point tracking (MPPT) has become an important part of the photovoltaic power generation system. In the use of photovoltaic grid-connected inverters, multiple photovoltaic strings are usually connected to the multiple input terminals of the photovoltaic inver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67H02J3/38H02M7/44H02M3/04
CPCG05F1/67H02J3/381H02M7/44H02M3/04
Inventor 张继征仇鹤陈子栋
Owner KUNSHAN TYSEN KLD PHOTOELECTRIC TECH
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