Inverter control method based on voltage feedforward and recombination current control

A composite current and control method technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. Problems such as reducing the resonant characteristic frequency of LCL filter

Active Publication Date: 2016-07-13
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

However, this control strategy still has some limitations: First, the weighted current feedback control does not directly control the grid-side current, and when the capacitance of the LCL filter is large, there is an obvious error in

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  • Inverter control method based on voltage feedforward and recombination current control
  • Inverter control method based on voltage feedforward and recombination current control
  • Inverter control method based on voltage feedforward and recombination current control

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Embodiment Construction

[0035] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

[0036] An inverter control method based on voltage feedforward and composite current control proposed by the present invention, wherein, as figure 1 As shown, the inverter includes a three-phase full-bridge topology composed of six power switch modules, and is connected to the common connection point PCC through the LCL filter and then connected to the large power grid. The DC side of the inverter is connected to the busbar A capacitor, the LCL filter is composed of an inverter side filter inductor, a power grid side filter inductor and a filter capacitor.

[0037]The inverter control method includes the following steps:

[0038] Step 1. At the beginning of each sampling ...

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Abstract

The invention discloses an inverter control method based on voltage feedforward and recombination current control. After signal collection is conducted, reference voltage can be obtained via dead beat control, duty ratio signals of a switch tube can be obtained via sine pulse width modulation or space vector pulse width modulation, and therefore switch-on and switch-off of the switch tube of the inverter can be controlled. According to the inverter control method disclosed in the invention, a predicted voltage value of a common connection point PCC is used as voltage feedforward in a procedure where the reference voltage is obtained via dead beat control, recombination current control is also adopted, an LCL wave filtering device can be prevented from resonance oscillation, and the control precision of a control algorithm can be improved. The control method cannot be affected by power grid voltage distortion, inverter grid connected current control precision can be effectively improved, the robustness of a control system can be improved, and system operation safety and stability can be ensured.

Description

technical field [0001] The invention relates to a control method of a grid-connected converter, in particular to a control strategy based on voltage feed and composite current control. Background technique [0002] In recent years, problems such as energy shortage and environmental pollution have become increasingly serious. Therefore, the development and utilization of new energy sources such as solar energy, wind energy, and hydrogen energy are accelerating day by day, and new distributed power generation technologies are attracting more and more attention. In the distributed grid-connected power generation system, the inverter plays an essential interface between the renewable energy conversion device and the grid, and becomes an extremely important part of the distributed power generation system. At the same time, since a pulse width modulation (PWM) control strategy will generate high-frequency switching harmonics, a filter needs to be used on the AC side for filtering...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02J3/38H02J3/01
CPCH02J3/01H02J3/38H02M7/5387H02M1/0006Y02E40/40
Inventor 何晋伟梁倍华王成山
Owner TIANJIN UNIV
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