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A t-type three-level inverter parallel system and its decoupling control method

A three-level inverter, decoupling control technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the hardware mismatch dead time control algorithm execution time, affect the life of IGBT switch tube, grid connection Current distortion and other problems, to achieve the effect of solving the problem of circulating current suppression, small harmonic content, and solving the problem of neutral point voltage balance

Active Publication Date: 2018-06-19
SHANDONG UNIV
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Problems solved by technology

Therefore, T-type three-level inverters have been widely used in distributed power generation occasions such as photovoltaic power generation and micro-grid, but capacity has always been the bottleneck restricting its rapid development.
[0003] The parallel connection of multi-machine T-type three-level inverters can increase system capacity, reliability and efficiency, and has become an important choice for high-power distributed power generation. However, hardware mismatch between modules, dead time and control algorithm execution time, etc. circulation
Circulating current will increase system loss and cause grid-connected current distortion, seriously affecting the life of IGBT switch tubes, so it is of great significance to study the circulating current suppression of parallel T-type three-level inverters

Method used

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  • A t-type three-level inverter parallel system and its decoupling control method
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  • A t-type three-level inverter parallel system and its decoupling control method

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046] The topology diagram of the three-level inverter parallel system is as follows: figure 1 As shown, the two inverters share the AC and DC buses, and P and N are the positive and negative buses of the parallel system; C j1 、C j2 It is two capacitors connected in parallel with the DC side, and the midpoint is Z j ;The system adopts L filter, and the filter inductance is L j , the zero sequence current is i zj , i mj is the m-phase output current of the j-th inverter, m=a, b, c, j=1, 2; i A i B i C is the grid-connected current of the system. Among them, the DC side of the T-type three-level inverter is connected in parallel to the same DC voltage source, and the AC side of the T-type three-level inverter is filtered by a filter and connected in parallel to realize the grid-connected function.

[0047] as figure 2 The single inverter struc...

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Abstract

The invention discloses a T-type three-level inverter parallel decoupling control system and method, comprising: a pulse width modulation signal generator and a small vector controller; the three-phase pulse width generated by the pulse width modulation signal generator The modulation signal is divided into two paths, one path is transmitted to the small vector controller, and the other path is transmitted to the three-level inverter; the small vector controller is also connected to each switching tube of the three-level inverter; the beneficial effects of the present invention are as follows: The decoupling control method in the present invention can limit the midpoint voltage to a small fluctuation area, and quickly restore the balance when the midpoint voltage deviates from the balance point.

Description

technical field [0001] The invention belongs to the field of inverters, and relates to a T-type three-level inverter parallel system and a decoupling control method thereof. Background technique [0002] With the large-scale access of distributed energy sources including photovoltaic power generation systems to the low-voltage distribution network, the power grid puts forward higher requirements on the output current waveform quality of grid-connected inverters. It is difficult for traditional two-level grid-connected inverters to meet large-scale Grid high power quality requirements. The emergence of T-type three-level grid-connected inverters solves the above problems, such as figure 2 As shown, compared with the traditional two-level inverter, the inverter has the advantages of small harmonics, low switching loss, and small electromagnetic interference; compared with the traditional diode-clamped three-level inverter, the inverter has The number of switches is small, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/493H02M7/483H02J3/38H02M7/5387
CPCH02J3/38H02J3/381H02M7/483H02M7/493H02M7/5387
Inventor 杜春水贾立朋张承慧陈阿莲张桐盛王伟
Owner SHANDONG UNIV
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