Single-phase five-level inverter with battery energy balance function and control strategy thereof

A five-level, balanced technology, applied in the field of power electronics, can solve the problems of capacitor voltage balance, limited device voltage stress, increased loss, etc., to achieve improved efficiency and reliability, reduced unbalance, and reduced loss. Effect

Inactive Publication Date: 2016-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the development of traditional multi-level inverters has been constrained by the increase of power devices resulting in increased losses, limited device voltage stress, capacitor voltage balance problems, and reliability issues.

Method used

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  • Single-phase five-level inverter with battery energy balance function and control strategy thereof
  • Single-phase five-level inverter with battery energy balance function and control strategy thereof
  • Single-phase five-level inverter with battery energy balance function and control strategy thereof

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Embodiment Construction

[0022] A single-phase five-level inverter with a battery energy balancing mechanism, such as figure 1 As shown, it includes two batteries (voltages are Vdc1, Vdc2), 7 MOSFETs (S1-S7), 6 diodes (D1-D6), two output filter inductors (L1, L2); the positive pole of the first battery Connected to the drain of S1 and the drain of S6, the source of S1 is connected to the negative pole of D1, the drain of S2, the source of S2 is connected to the drain of S3, and one end of L1, and the source of S3 is connected to the positive pole of D2 , The drain of S4 is connected, the positive pole of D1, the negative pole of D2 are connected with the negative pole of the first battery, the positive pole of the second battery, the positive pole of D5, and the negative pole of D6, the source pole of S6 is connected with the positive pole of D3, the negative pole of D4, The drain of S7 is connected to one end of L2, the source of S4 and the source of S7 are connected to the negative pole of the secon...

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Abstract

The invention discloses a single-phase five-level inverter with a battery energy balance function. The inverter consists of a half-bridge two-level inverter, a three-level diode-clamped inverter, a bilateral switch and two filter inductors. In an inverter topological structure provided by the invention, redundant switch combinations exist on a part of levels, but electric energy charging and discharging situations of an energy storage battery on a direct-current side are different in different switch states. Balance of battery energy can be realized by means of selecting the redundant switch combinations. Compared with a conventional five-level inverter, the single-phase five-level inverter has the advantages that a quantity of switching devices is reduced, and the reliability is enhanced. A voltage and an electric quantity of a battery (capacitor) can be balanced, so that the problem of imbalance of the electric quantity of the battery (capacity) on the direct-current side caused by charging imbalance can be solved when shadows or hot spots occur on a local photovoltaic panel.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a single-phase five-level inverter, in particular to a single-phase five-level inverter with a battery energy balancing function and a control strategy thereof. Background technique [0002] In academia and industry, new energy such as solar energy and wind energy have received more and more attention, because new energy has greatly reduced the dependence on traditional fossil energy, and it is very important for alleviating the energy crisis and protecting the environment. has an important role. Especially with the continuous development of semiconductor technology in recent years, the efficiency of photovoltaic panels has been continuously improved, and the cost has been continuously reduced, thus prompting photovoltaic power generation systems to be used more and more widely. For power supply in remote areas and independent islands, an independent photovoltaic power g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02J7/00
CPCH02J7/0016H02M7/483Y02E10/56
Inventor 常晓飞杨雁勇
Owner ZHEJIANG UNIV
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