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Three-phase grid-connected inverter seamless grid-connected controller and control method thereof

A technology of inverters and controllers, applied in the field of seamless grid-connected controllers and their controls, can solve the problem of complex control, difficult grid-connected inverters, seamless grid-connected, and inability to ensure that grid-connected inverters are completely consistent and other issues to achieve the effect of simple control

Active Publication Date: 2015-10-28
忱芯科技(上海)有限公司
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Problems solved by technology

In order to realize the seamless grid connection of three-phase grid-connected inverters, it is usually necessary to convert the voltage control mode to the current control mode, and the control is complicated
In addition, in the case of grid voltage distortion, it is impossible to ensure that the output voltage of the grid-connected inverter is exactly the same as the grid voltage during grid connection, so it is difficult to achieve seamless grid-connection of the grid-connected inverter

Method used

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  • Three-phase grid-connected inverter seamless grid-connected controller and control method thereof
  • Three-phase grid-connected inverter seamless grid-connected controller and control method thereof

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Embodiment Construction

[0011] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0012] The specific embodiment of the present invention will be described according to the accompanying drawings. Depend on figure 1 It can be seen that the three-phase grid-connected inverter includes a three-phase inverter bridge, filter and grid-connected switch connected in sequence, and the seamless grid-connected controller of the three-phase grid-connected inverter includes a digital signal processor DSP, a grid-connected switch Drive circuit and inverter power tube drive circuit, in which the digital signal processor DSP includes a space vector pulse width modulation SVPWM module, a grid current abc / dq coordinate rotation transformation module, a grid voltage abc / dq coordinate rotation transformation module, and a phase-locked loop PLL module, dq / αβ coordinate rotation transformation module, incoming grid quadrature axis current controller ...

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Abstract

The invention discloses a three-phase grid-connected inverter seamless grid-connected controller and a control method thereof. The controller provided by the invention comprises a digital signal processor, a grid-connected switch drive circuit and an inverter power tube drive circuit. The digital signal processor comprises a space vector pulse width modulation module, a grid access current abc / dq coordinate rotation transformation module, a power grid voltage abc / dq coordinate rotation transformation module, a phase-locked loop module, a dq / alpha beta coordinate rotation transformation module, a grid access cross axis current controller and a grid access direct axis current controller. According to the method provided by the invention, cross axis compensation voltage is added and the input of a grid access direct and cross axis current regulator is controlled to realize seamless grid-connection. The seamless grid-connected controller provided by the invention is applicable to a three-phase grid-connected inverter, has the advantage of simple control, does not need mode switching and produces no impact on a power grid when grid-connection is carried out.

Description

technical field [0001] The invention relates to a seamless grid-connected control method of a grid-connected inverter, in particular to a seamless grid-connected controller of a three-phase grid-connected inverter and a control method thereof. Background technique [0002] In recent years, with the increasing date of fossil energy and environmental pollution, the development and application of renewable energy has attracted widespread attention from countries all over the world. In a distributed power generation system, since the output of renewable energy such as solar energy and fuel cells is direct current, and the grid voltage is alternating current with fixed frequency and amplitude, grid-connected inverters are required for energy conversion. Since the load of the grid-connected inverter is the grid, which is a voltage source, in order to reduce the impact on the grid, the grid-connected inverter is required to achieve seamless grid-connection. In order to realize the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 姚志垒于学华陈冲顾春雷李小凡徐静
Owner 忱芯科技(上海)有限公司
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