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T-type three-level inverter parallel system and decoupling control method thereof

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

Active Publication Date: 2016-07-06
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

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the drawings and embodiments.

[0050] Three-level inverter parallel system topology diagram such as figure 1 As shown, the two inverters share the AC and DC bus, and P and N are the positive and negative buses of the parallel system; C j1 , C j2 Two capacitors connected in parallel with the DC side, the midpoint is Z j ; The system uses an 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 jth inverter, m=a, b, c, j=1, 2; i A , I B , I C Grid current for 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 connected in parallel after filtering by a filter to realize the grid-connected function.

[0051] Take as figure 2 The single inverter structure shown illustrates the inverter control strategy.

[005...

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Abstract

The invention discloses a T-type three-level inverter parallel decoupling control system and method. The system comprises a pulse width modulation signal generator and a small vector controller, wherein a three-phase pulse width modulation signal generated by the pulse width modulation signal generator is divided into two paths, one path is transmitted to the small vector controller, the other path is transmitted to a three-level inverter, the small vector controller is further connected with each switching tube of the three-level inverter. The system has the advantages that a neutral-point voltage can be limited in a region with relatively small fluctuation by a decoupling control mode, and the neutral-point voltage can be rapidly balanced when departs from a 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 integration of distributed energy sources including photovoltaic power generation systems into the low-voltage distribution grid, the power grid has put forward higher requirements on the quality of the output current waveform of the grid-connected inverter. The traditional two-level grid-connected inverter is difficult to meet the large-scale The power grid requires high power quality. The emergence of T-type three-level grid-connected inverter has solved 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(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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