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Control method and controller for cascaded H-bridge inverter

A control method and inverter technology, which are applied in the direction of converting irreversible DC power input into AC power output, output power conversion devices, electrical components, etc., can solve the problem of unavoidable over-modulation of H-bridge modules.

Active Publication Date: 2018-08-21
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, when the input power imbalance between the various H-bridge modules is serious, the modulation degree of some H-bridge modules under this method may be greater than 1.155. Even if the third harmonic is compensated, the over-modulation of some H-bridge modules cannot be avoided.

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  • Control method and controller for cascaded H-bridge inverter
  • Control method and controller for cascaded H-bridge inverter
  • Control method and controller for cascaded H-bridge inverter

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Embodiment Construction

[0059] The technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative work, all belong to the scope of protection of this application.

[0060] The invention provides a control method for cascaded H-bridge inverters to expand the operating range of the system.

[0061] The control method of the cascaded H-bridge inverter is applied in the controller of the cascaded H-bridge inverter; as shown in Figure 1, the main circuit of the cascaded H-bridge inverter includes a plurality of cascaded H bridge module; see figure 2 , the control method of the cascaded H-bridge inverter includes:

[0062] S101. Calculate and...

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Abstract

The invention provides a control method for a cascaded H-bridge inverter. A second harmonic for compensating for a modulated wave of a normal module and a first harmonic for compensating for an amplitude limiting modulated wave of an overmodulation module are homogeneous, and have the same amplitude and opposite phase, it can be ensured that total alternating current output voltage of a cascaded H-bridge module does not contain compensated harmonics, and a compensation range is expanded, thereby expanding the operating range of a system. The invention also provides a controller for the cascaded H-bridge inverter, and the same technical means is adopted to expand the operating range of the system.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a control method and a controller of a cascaded H-bridge inverter. Background technique [0002] In the field of photovoltaic power generation, the system structure of the cascaded H-bridge inverter is as follows: figure 1 As shown, the input terminals of each H-bridge module can be respectively connected to a photovoltaic module (such as figure 1 shown) or at least one photovoltaic string, or other DC conversion equipment can also be added. When uneven lighting or other conditions cause a severe drop in the power received at the input of one or even several H-bridge modules, the grid current is will drop sharply; since the input power of other H-bridge modules is almost constant, their modulation degree will increase. Big. However, over-modulation will increase the harmonic content of the grid current, and even cause the system to run unstable. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M1/12
CPCH02M1/12H02M7/48H02M1/007
Inventor 赵涛徐君王新宇顾亦磊张兴
Owner SUNGROW POWER SUPPLY CO LTD
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