Quasi-Z-source cascaded multi-level photovoltaic grid-connected inverter control system and method thereof

A control system and multi-level technology, which is applied in general control systems, control/regulation systems, program control, etc., can solve the problems that DSP controllers cannot meet the needs of control systems, large amounts of voltage and current data, and large physical distances. Achieve the effect of easy modular design, strong versatility and high speed

Active Publication Date: 2016-04-27
SHANDONG UNIV
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Problems solved by technology

[0003] However, compared with the traditional two-level inverter, the quasi-Z source cascaded multi-level inverter system has a complex structure, the physical distance between the modular quasi-Z source H-bridge units is large, and

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  • Quasi-Z-source cascaded multi-level photovoltaic grid-connected inverter control system and method thereof
  • Quasi-Z-source cascaded multi-level photovoltaic grid-connected inverter control system and method thereof
  • Quasi-Z-source cascaded multi-level photovoltaic grid-connected inverter control system and method thereof

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Embodiment Construction

[0042] The present invention is described in detail below in conjunction with accompanying drawing:

[0043] The quasi-Z source cascaded multilevel inverter adds a quasi-Z source network on the basis of the traditional cascaded inverter topology, and has more excellent performance. figure 1 The main circuit of the three-phase inverter in this topology is shown. The quasi-Z source H-bridge unit control technology is simple, the control strategy is easy to program and realize, and the modularization is easy to realize, which makes the quasi-Z source cascaded multilevel inverter easy to realize in engineering.

[0044] In order to meet system control requirements, enhance system scalability, and give full play to the characteristics of different controllers, the present invention designs a dual-controller control system based on FPGA and DSP.

[0045] A control system of a quasi-Z source cascaded multi-level photovoltaic grid-connected inverter, such as figure 1 As shown, it in...

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Abstract

The invention discloses a quasi-Z-source cascaded multi-level photovoltaic grid-connected inverter control system and a method thereof. The control system comprises a field programmable gate array (FPGA) control logical unit, a digital signal processor (SDP) algorithm calculation unit, a touch screen man-machine interface unit, a high-precision analog-digital conversion unit and a driving signal electro-optical conversion unit, wherein the DSP algorithm processing unit is connected with the FPGA control logical unit and the touch screen man-machine interface unit respectively, and the FPGA control logical unit is connected with the high-precision analog-digital conversion unit and the driving signal electro-optical conversion unit respectively. The control system has the advantages that the expansion demand can be satisfied based on dual controllers of a FPGA and a DSP, complicated control algorithm operation also can be achieved, the function division is reasonable and clear, and the system structure is high in universality.

Description

technical field [0001] The invention belongs to the technical field of cascaded multi-level grid-connected photovoltaic inverters, and in particular relates to a quasi-Z source cascaded inverter control system based on FPGA and DSP. Background technique [0002] At present, the scale of global solar power generation continues to expand, and solar power generation technology has received extensive attention and research from many scholars. Cascaded multi-level inverters have good application value in large-scale photovoltaic grid-connected systems. This topology inverter requires multiple independent DC power sources, which exactly match the characteristics of photovoltaic power generation. This kind of inverter can control different photovoltaic power generation modules to output maximum power, and it is easier to achieve high output voltage level. The quasi-Z source cascaded multilevel inverter adds a quasi-Z source network on the basis of the traditional cascaded inverter...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02H7/122G05B19/042
CPCG05B19/0423H02H7/1225H02M7/483Y02E10/56
Inventor 杜春水郭文君张承慧陈阿莲
Owner SHANDONG UNIV
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