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Modularization multi-level photovoltaic grid connected system and control method thereof

A modular multi-level, control method technology, applied in photovoltaic power generation, control/regulation systems, and electrical variable adjustment, etc., can solve problems such as output efficiency drop, array power mismatch, low photovoltaic module power, etc., to increase capacity , The effect of reducing capacitive stress and reducing the harmonic content of inverter output

Inactive Publication Date: 2014-11-26
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Photovoltaic modules have low power and are difficult to apply in a wide range
Photovoltaic arrays are often located in complex environments. Under shadow conditions, it is easy to cause array power mismatch, decrease output efficiency, and conventional maximum power control methods fail. However, the global maximum power control method is complicated, which will increase costs.
The traditional two-level inverter has a small capacity, the switching device withstands a large voltage and current, the DC capacitor stress is large, and the output harmonic content is large, making filtering difficult
When using a DC modular photovoltaic system, although the anti-shading ability is enhanced, the conventional inverter is still used, and the effect is not good

Method used

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Embodiment Construction

[0044] The present invention will be further explained below with reference to the drawings and embodiments;

[0045] Such as figure 1 (a) is the SM sub-module. SM is composed of two IGBT tubes T1 to T2, two diodes D1 to D2 and a capacitor C; among them, the emitter of IGBT tube T1 is connected to the collector of IGBT tube T2 to form the positive end of SM, and the collector of IGBT tube T1 The anode of the electrode capacitor C is connected, and the emitter of the IGBT tube T2 is connected with the cathode of the capacitor to form the negative terminal of SM; D1 and T1 are in anti-parallel, and D2 and T2 are in anti-parallel. The gates of the IGBT tubes T1 to T2 all receive switching signals provided by external devices. When the photovoltaic module is in the shadow, the half-bridge module generates a compensation voltage to maintain the DC voltage stability.

[0046] Such as figure 1 (b) is the PM sub-module. PM is a photovoltaic module PV connected in parallel across capac...

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Abstract

The invention discloses a modularization multi-level photovoltaic grid connected system and a control method thereof. A three-phase six-leg topology structure is employed each leg is formed by connecting a half-bridge module SM, N assembly modules PM and one inductor L in series. Each SM is composed of two IGBT tubes T1 and T1, two diodes D1 and D2, and one capacitor C. Each PM is formed by connecting one photovoltaic assembly PV at the two ends of the capacitor C on the basis of each SM. The control method comprises maximum power tracking control, redundancy module control, voltage stabilization control and grid connected control. According to the invention, reliable working of an inverter and maximum power tracking of the photovoltaic assemblies can be realized under the condition of local shadow, a modularization multi-level structure reduces capacitor stress and an inversion output harmonic wave content, a DC transformation circuit is unnecessary, through the control method, the maximum power tracking of each PV assembly is realized, compared to a conventional array global maximum power control method, the output power is improved, and hardware investment is reduced.

Description

Technical field [0001] The invention relates to a distributed power supply, in particular to a modular multi-level photovoltaic grid-connected system and a control method thereof. Background technique [0002] In today's world, energy issues are becoming increasingly prominent. Seeking new energy sources to replace the ever-decreasing fossil fuels has become an inevitable trend in energy development. Among all new energy power generation, solar power generation has a prominent position and obvious advantages. Solar energy is an inexhaustible energy source with huge reserves. There are no mining and transportation links. Solar power generation is clean and pollution-free, does not emit exhaust gas, and is beneficial to environmental protection. Today, when the energy crisis is about to break out and the environment is gradually deteriorating, solar power technology has important research value and broad application prospects. [0003] Photovoltaic power generation is an important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38G05F1/67
CPCY02E10/56
Inventor 荣飞刘诚唐庆朱斌徐业事
Owner HUNAN UNIV
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