Control method applied to active-clamp flyback miniature photovoltaic grid-connected inverter device

A control method and flyback converter technology, which is applied in photovoltaic power generation, conversion of irreversible DC power input to AC power output, control/regulation system, etc., can solve the problem that the clamping circuit is difficult to achieve the effect, etc.

Active Publication Date: 2012-01-04
ALTENERGY POWER SYST
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  • Abstract
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Problems solved by technology

In this case, it is difficult for the clamping cir...

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  • Control method applied to active-clamp flyback miniature photovoltaic grid-connected inverter device
  • Control method applied to active-clamp flyback miniature photovoltaic grid-connected inverter device
  • Control method applied to active-clamp flyback miniature photovoltaic grid-connected inverter device

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] Such as figure 1 Shown is a schematic structural diagram of an active clamp flyback miniature photovoltaic grid-connected inverter applying the control method of the present invention. 10 is an active clamp flyback photovoltaic grid-connected inverter device; 101 is a solar panel; 102 is a flyback converter; 1021 is an active clamp circuit in a flyback converter; Figure 103 is a power frequency pole Character conversion circuit; Figure 104 is the power grid side filter circuit; Figure 105 is the FPGA control circuit, that is, the controller, that is, the V PV - PV side DC input voltage; V g - grid side voltage; T r - Transformer for the flyback converter; S m - Primary switch tube; S a - Auxiliary switch tube; D a - Auxiliary diode; C clamp - Clamp capacitor; D s - Output rectifier diode on the secondary side of the flyback converter; S 1 ~S 4 - swit...

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Abstract

The invention relates to a control method which can be applied to an active-clamp flyback miniature photovoltaic grid-connected inverter device. The active-clamp flyback miniature photovoltaic grid-connected inverter device comprises a flyback converter and a power frequency polarity conversion circuit. In the device, a current reference is used for controlling a flyback primary-side current peak value so that the device can output a half-wave sinusoidal current, and the output voltage is clamped by a grid voltage. When the instantaneous power is lower, a constant frequency current discontinuous mode in combined with a variable frequency current critical continuous mode is adopted in the flyback control method. When the flyback converter works in a variable frequency current critical discontinuous mode, an auxiliary switching tube can be conducted for a period of time when the secondary-side current of the flyback converter reaches zero, the conduction time can be accurately controlled by a digital chip, thus realizing the leakage inductance energy feedback and the soft switch of a master switching tube under the condition of wide-range output voltages and different instantaneous powers and greatly improving the efficiency under the condition of full loads.

Description

technical field [0001] The present invention is a control method applied to an active clamp flyback miniature photovoltaic grid-connected inverter device Background technique [0002] For photovoltaic power generation systems, there are two potential markets: megawatt-level large-scale photovoltaic power plants and small-scale building and household photovoltaic power generation systems. Micro photovoltaic grid-connected inverters have broad application prospects in the latter. [0003] The main factors affecting the efficiency of the micro photovoltaic grid-connected inverter using flyback topology on the DC side are the leakage inductance of the transformer and the loss of the main switching tube, so further optimization of the two is required. [0004] To deal with the leakage inductance energy of the transformer, passive snubber circuits and active snubber circuits can be used. For passive snubber circuits, such as RCD snubber circuits or LC snubber circuits, when the f...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M3/335
CPCY02E10/56
Inventor 陈敏莫琼张哲钱照明
Owner ALTENERGY POWER SYST
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