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PCI control-based LCL type three-phase grid connecting inverter double-ring control method

A double-loop control and inverter technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of high-speed transient response, miniaturization, light weight, Problems such as high efficiency, high power factor, system stability margin and limited reliability, etc., to achieve the effect of no static error tracking, improve system stability, and improve waveform quality

Inactive Publication Date: 2016-08-10
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

However, the traditional PI control and quasi-resonant control have limited stability margin and reliability under the same parameter conditions.
[0007] In view of the above reasons, the control method of the traditional double-loop control three-phase grid-connected inverter is difficult to meet the technical indicators of input and output high-speed transient response, miniaturization, light weight, high efficiency, and high power factor

Method used

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  • PCI control-based LCL type three-phase grid connecting inverter double-ring control method
  • PCI control-based LCL type three-phase grid connecting inverter double-ring control method
  • PCI control-based LCL type three-phase grid connecting inverter double-ring control method

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Such as figure 2 As shown, a PCI-based LCL three-phase grid-connected inverter double-loop control method is used in the LCL three-phase grid-connected inverter system, and the PCI-based LCL three-phase grid-connected inverter The PI controller in the double-loop control method is replaced by a PCI controller.

[0038] The method includes the following steps:

[0039] (1) The three-phase power grid voltage phase-locked loop detects the grid voltage phase signal θ, and the reference current i in the two-phase rotating coordinate system d i q Transformed into the reference current i in the two-phase stationary coordinate system α i β ;

[0040] (2) Transform the collected grid-side current and grid-connected current into the grid-side current i in the two-phase stationary coordinate system cα i cβ and grid current i 2α i 2β ; ...

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Abstract

The invention relates to a PCI control-based LCL type three-phase grid connecting inverter double-ring control method which is used in a LCL type three-phase grid connecting inverter system. A PI controller in the PCI control-based LCL type three-phase grid connecting inverter double-ring control method is replaced by a PCI controller. Compared with the prior art, the method is high in reliability and wide in application scope.

Description

technical field [0001] The invention relates to a double-loop control method of an LCL type three-phase grid-connected inverter, in particular to a double-loop control method for an LCL type three-phase grid-connected inverter based on PCI control. Background technique [0002] With the development of economy and energy consumption in modern society, the pollution caused by traditional fossil energy and its own depletion are inevitable. Human beings pay more attention to renewable energy. Wind energy and solar energy are clean and non-polluting new energy sources with rich content and are the first choice. The inverter technology is one of the extremely important technologies in the process of connecting new energy to the grid. [0003] The inverter output current must pass through a filter to filter out high-order harmonics. The commonly used filters today are L-type filters, LC-type filters and LCL-type filters. The L-type filter has a simple structure and is easy to imp...

Claims

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Application Information

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IPC IPC(8): H02M7/537H02M1/12
CPCH02M7/537H02M1/126
Inventor 杨旭红李浩然
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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