Three-level Boost converter, control method and photovoltaic system

A converter and three-level technology, applied in the direction of inductors, photovoltaic modules, photovoltaic power generation, etc., can solve the problems of inconsistent magnetic core saturation, unbalanced bus capacitance, reduce the cost, volume and weight of the converter, and achieve improved Reliability, reducing inductor current ripple, and avoiding the effect of bus capacitor uneven voltage

Pending Publication Date: 2019-08-06
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above technical problems, this application provides a three-level Boost converter, a control method and a photovoltaic system, which significantly reduces the cost, volume and weight of the converter, and also solves the magnetic core saturation caused by the difference of the magnetic core body The degree of inconsistency, and can effectively avoid the problem of unbalanced bus capacitance

Method used

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  • Three-level Boost converter, control method and photovoltaic system
  • Three-level Boost converter, control method and photovoltaic system
  • Three-level Boost converter, control method and photovoltaic system

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Embodiment 1

[0063] Embodiment 1 of the present application provides a three-level Boost converter, which will be described in detail below with reference to the accompanying drawings.

[0064] see Figure 5 , which is a schematic diagram of a three-level Boost converter provided in Embodiment 1 of the present application.

[0065] The converter includes: an integrated coupling reactance 501 , a first switch tube Q1 , a second switch tube Q2 , a third switch tube Q3 and a fourth switch tube Q4 , a first capacitor C1 and a second capacitor C2 . Wherein, the integrated coupling reactance 501 includes a first winding N1, a second winding N2 and a common magnetic core, and the first winding N1 and the second winding N2 share the common magnetic core.

[0066] The first end of the first winding N1 is connected to the positive input end of the converter, the second end of the first winding N1 is connected to the first node A, the first end of the third switching transistor Q3 is connected to th...

Embodiment 2

[0079] Embodiment 2 of the present application also provides another three-level Boost converter, which is different from Embodiment 1 in that the first winding and the second winding of the three-level Boost converter provided in this embodiment have the same inductance. In order to realize the simultaneous turn-on or turn-off of the first switch tube and the second switch tube, the converter also includes an isolation drive chip, which will be described in detail below with reference to the accompanying drawings.

[0080] see Figure 7 , which is a circuit diagram of another three-level Boost converter provided in Embodiment 2 of the present application.

[0081] Based on the converter provided in Embodiment 1, the converter provided in this embodiment further includes: a first isolation driver chip 701 and a second isolation driver chip 702 . The first isolation driver chip 701 and the second isolation driver chip 702 may be identical.

[0082] The first switching tube Q1...

Embodiment 3

[0090] continue to see Figure 2 to Figure 4 , due to the asynchronous three-level control method used in the control of the traditional three-level Boost converter, the potential of the midpoint O of the output bus capacitor has a large common-mode voltage jump relative to the negative input terminal, which increases the leakage current ; and the inductor current flows through C2 when Q1 is turned on and Q2 is turned off, and flows through C1 when Q1 is turned off and Q2 is turned on. The charging time of C1 and C2 is inconsistent, so it is necessary to add additional voltage equalization control to balance the voltage of C1 and C2 , leading to complex system control. In order to solve the above problems, an embodiment of the present application further provides a method for controlling a three-level Boost converter, which will be described in detail below with reference to the accompanying drawings.

[0091] The control method provided in the embodiment of this application ...

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Abstract

The invention discloses a three-level Boost converter, a control method and a photovoltaic system. The three-level Boost converter comprises an integrated coupling reactor, first to fourth switch tubes, and first and second capacitors; the integrated coupling reactor comprises a first winding, a second winding and a public magnetic core, and the first and second windings are both mounted on the public magnetic core. and the first end of the first winding and the first end of the second winding belong to a dotted terminal. According to the three-level Boost converter, the cost, size and weightof a converter are substantially reduced, and the problem that difference of a magnetic core body causes inconsistent saturation degree of the magnetic core is solved. The invention also provides a simultaneously switching ON / OFF control method which can be used to effectively solve the problem of unbalanced voltage of bus capacitors.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a three-level Boost converter, a control method and a photovoltaic system. Background technique [0002] Photovoltaic power generation is a technology that converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. Due to the influence of factors such as light and temperature, the output voltage of photovoltaic panels varies in a wide range. In order to maximize the power generation capacity of photovoltaic panels, a two-level boost circuit is usually added before the photovoltaic inverter. see figure 1 As shown, the Boost boost circuit 103 is connected with the photovoltaic inverter 102, and when the input voltage is lower than the minimum grid-connected DC voltage requirement of the photovoltaic inverter, the Boost boost circuit 103 works to realize boost and maximum power point tracking; When the input voltage is h...

Claims

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Application Information

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IPC IPC(8): H02M3/04H02M3/10H01F37/00H02S40/30H02J3/38
CPCH02J3/385H02M3/04H02M3/10H01F37/00H02S40/30Y02E10/56
Inventor 汪昌友王鹏张兵薛丽英李顺
Owner SUNGROW POWER SUPPLY CO LTD
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