Hybrid modulation system and method of interlaced flyback photovoltaic grid-connected mini-type inverter

A technology of micro-inverter and hybrid modulation, which is applied in the directions of photovoltaic power generation, AC network circuit, single-net parallel feeding arrangement, etc., and can solve problems such as limiting converter efficiency

Inactive Publication Date: 2015-01-07
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no relevant research on the selection of the critical point of the current critical continuous and current discontinuous operating modes. At the same time, when the above-mentioned modulation methods are used in the interleaved photovoltaic micro-inverter, the modulation methods of the master phase and the slave phase are consistent, which limits the Further improvement of converter efficiency

Method used

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  • Hybrid modulation system and method of interlaced flyback photovoltaic grid-connected mini-type inverter
  • Hybrid modulation system and method of interlaced flyback photovoltaic grid-connected mini-type inverter
  • Hybrid modulation system and method of interlaced flyback photovoltaic grid-connected mini-type inverter

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Embodiment Construction

[0065] It will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0066] Based on the use of 2ΦDCM modulation can effectively reduce the current stress, reduce the MOSFET conduction loss, turn-off loss, as well as the conduction loss of the rectifier diode and the copper loss of the transformer; the use of 1ΦDCM modulation can reduce the driving loss of the MOSFET and the magnetic core of the transformer loss. The present invention adopts 1ΦDCM and 2ΦDCM modulation for mixed modulation according to the difference of load current within half a power frequency cycle. When the load current is large, the 2ΦDCM modulation strategy is used; Realize high efficiency and high power operation in the full load range of the converter.

[0067] combine image 3 and Figure 4 , in the hybrid modulation system of the interleaved anti-laser photovoltaic grid-connected micro-inverter in a specific embodiment of the present invention, the pho...

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Abstract

The invention discloses a hybrid modulation system and method of an interlaced flyback photovoltaic grid-connected mini-type inverter. A photovoltaic module is switched in an alternating current power grid through the interlaced flyback inverter. The interlaced flyback inverter comprises a main-phase controllable switch and an auxiliary-phase controllable switch. A power grid voltage and current sampling unit composed of an overturning circuit, a current sampling module and a voltage sampling module, an MPPT unit connected with the output end of the photovoltaic module, a drive signal generating unit comprising a current regulator, a current reference signal generating module and a multiplying unit which is connected with the MPPT unit and a rectifying circuit are arranged between the photovoltaic module and the alternating current power grid. The current regulator is used for controlling on-off of the main-phase controllable switch and the auxiliary-phase controllable switch so as to control the working state of the interlaced flyback inverter. Due to the fact that the strategy of two-phase DCM and one-phase DCM hybrid modulation is adopted in a half power frequency period, the main loss of the inverter is optimized according to the load current, and therefore the inverter can run in an efficient and high-power mode within the whole load range.

Description

technical field [0001] The invention relates to the technical field of inverter modulation in photovoltaic grid-connected technology, in particular to a hybrid modulation system and method for interleaved reflection photovoltaic grid-connected micro-inverters. Background technique [0002] A micro-inverter is a device that directly inverts the direct current output by each photovoltaic module into alternating current. In the photovoltaic grid-connected technology, because the flyback converter has the advantages of simple structure and low cost, the photovoltaic grid-connected micro-inverter based on the flyback converter has been widely developed in recent years. For the modulation of this kind of interleaved reflective photovoltaic grid-connected micro-inverter, current critical continuous (Boundary Conduction Mode, BCM) and current discontinuous (Discontinues Conduction Mode, DCM) control methods are usually used. BCM and DCM control methods are suitable for micro-inverte...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 张玥张之梁
Owner STATE GRID CORP OF CHINA
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