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Photovoltaic component DC grid-connection controller

A photovoltaic module and controller technology, applied in photovoltaic power generation, single-net parallel feeding arrangement, etc., can solve problems such as photovoltaic array efficiency decline, and achieve the effect of structural simplification

Inactive Publication Date: 2011-01-05
KUNMING PROMEE ENERGY TECH
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Problems solved by technology

[0004] In order to overcome the problems of the efficiency drop of the photovoltaic array and the complex structure of the inverter, the present invention provides a photovoltaic module DC grid-connected controller, which can not only effectively solve the problem of the efficiency drop of the photovoltaic array, but also Simplify the structure of the grid-connected inverter

Method used

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Embodiment Construction

[0013] exist figure 1 In the above, the direct current generated by the solar photovoltaic module (1) first enters the MPPT circuit module (2), and then enters the controllable buck-boost circuit module (3) after being processed by the circuit, and finally obtains a stable output voltage V P .

[0014] exist figure 2 Among them, the MPPT circuit module (2) is a step-down DC-DC switching conversion circuit, and the maximum power point of the output voltage is found by the MPPT central controller (9), and is always tracked and maintained. The specific working process is as follows, the duty ratio in the PWM signal of S1 output by the MPPT center (CPU) controller (9) controls the switch of the MOS tube K1 (4), so as to reduce the PV output voltage. Make the output of solar photovoltaic modules drop from the highest open-circuit voltage to the maximum power output voltage, through the power measurement of the output resistance load, and control the positive and negative disturb...

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Abstract

The invention relates to a photovoltaic component DC grid-connection controller. The invention is characterized in that the photovoltaic component DC grid-connection controller (5) is composed of an MPPT (Maximum Power Point Tracking) circuit module (2) and a controllable boost circuit module (3). The invention has the functions of keeping the photovoltaic component to be in the maximum power point tracking mode at any time and maintaining the output voltage at a stable preset value Vp. The invention enables the output of the photovoltaic component to be worked in the maximum available power state, and can be conveniently combined with other photovoltaic components to form a high-efficiency matrix. The invention effectively reduces the influence on the photovoltaic matrix from shielding, and simplifies the structure of a grid-connection inverter.

Description

Technical field [0001] The invention relates to a direct current grid-connected control system of solar photovoltaic components, belonging to the technical field of grid-connected solar photovoltaic power generation systems. technical background [0002] At present, the grid-connected solar photovoltaic power generation system is mainly composed of the following two parts. 1. The solar photovoltaic modules are connected in series and parallel to form a solar photovoltaic square array, and the photovoltaic square array outputs direct current with changing voltage and current at any time. 2. Grid-connected inverter, which inverts the direct current output by the photovoltaic array into alternating current that meets the grid standard and inputs it into the grid. At the same time, control such as maximum power tracking must be carried out on the photovoltaic modules. [0003] Such a system has the following problems: 1. The efficiency of the photovoltaic array decreases. When ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/58Y02E10/563Y02E10/56
Inventor 陈力陈松向峰
Owner KUNMING PROMEE ENERGY TECH
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