Inverter topology circuit for suppressing leakage current in photovoltaic grid-connected system and control method thereof

A technology of topology circuit and leakage current, applied in photovoltaic power generation, AC network circuit, circuit device and other directions, to achieve the effect of suppressing leakage current, simple modulation method and good reliability

Active Publication Date: 2017-09-26
深圳市富嘉新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the isolated structure, the non-isolated structure has an advantage in efficiency, but so far, some power switches of the non-isolated grid-connected inverter still work in the hard switching state

Method used

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  • Inverter topology circuit for suppressing leakage current in photovoltaic grid-connected system and control method thereof
  • Inverter topology circuit for suppressing leakage current in photovoltaic grid-connected system and control method thereof
  • Inverter topology circuit for suppressing leakage current in photovoltaic grid-connected system and control method thereof

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Experimental program
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specific Embodiment approach 1

[0038] Specific implementation mode one, see figure 1 Describe this specific embodiment. The inverter topology used to suppress leakage current in the photovoltaic grid-connected system described in this specific embodiment includes a photovoltaic array PV, an incoming and outgoing constant voltage capacitor C, a diode D, and a first controlled switch tube S1 , the second controlled switch tube S2, the third controlled switch tube S3, the fourth controlled switch tube S4, the fifth controlled switch tube S5, the sixth controlled switch tube S6, the first inductance L1 and the second inductance L2 And the power grid constitutes an inverter circuit with six controlled switch tubes.

[0039] The capacitor C is connected in parallel with the power supply U,

[0040] The positive pole of the power supply U is connected to the collector of the sixth controlled switch tube S6 at the same time,

[0041] The negative pole of the power supply U is connected to the emitter of the third...

specific Embodiment approach 2

[0048] Embodiment 2. The difference between this embodiment and the topology of the inverter used to suppress the leakage current in the photovoltaic grid-connected system described in Embodiment 1 is that the controlled switching tube is an IGBT, a MOSFET or a controllable One or a combination of several silicon rectifier elements.

[0049] figure 2 Figure 1-5 shows four working states of the topology structure of the present invention, the direction of the arrow is the direction of the inverter current, and the voltage value of the power supply is U.

[0050] figure 2It shows the schematic diagram of positive half-cycle working principle of the inverter topology used to suppress leakage current in the photovoltaic grid-connected system. During the positive half-cycle power processing stage, the fourth controllable switch S4 is always on, and the second The tube S2 and the third controllable switch tube S3 are always kept off, when the first controllable switch tube S1, t...

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Abstract

The invention discloses an inverter topology circuit for suppressing leakage current in a photovoltaic grid-connected system and a control method thereof. The inverter topology circuit comprises a first controlled switch tube S1, a second controlled switch tube S2, a third controlled switch tube S3, a fourth controlled switch tube S4, a fifth controlled switch tube S5, a sixth controlled switch tube S6, a diode D, a power supply U, a capacitor C, a first inductor L1 and a second inductor L2. The inverter topology according to the invention can be seen as a combination of H5 topology and HERIC topology. The topology circuit has advantages of simple structure, high operation efficiency, high reliability and simple utilized modulating method. The inverter topology circuit has advantages of ensuring no influence by current zero-crossing distortion when an inverter operates in a unit power factor, preventing current waveform distortion caused by power grid power fluctuation or operation in a non-unit power factor, improving inverter safety factor and realizing output electric energy quality improvement.

Description

technical field [0001] The invention belongs to the technical field of power electronic power converters. Specifically related to the total non-isolated photovoltaic grid-connected inverter in the future. Background technique [0002] In order to ensure the safe and reliable operation of the system and realize voltage adjustment and electrical isolation, the traditional grid-connected inverter system generally installs a power frequency isolation transformer at the output end. However, power frequency isolation transformers are bulky, costly, and have large losses, which affect the overall efficiency of the system. Therefore, the transformerless non-isolated grid-connected inverter is a hot research topic at present. Although removing the power frequency transformer can improve the overall efficiency of the grid-connected inverter system, it brings some new problems, such as common-mode current and DC injection. [0003] In order to effectively suppress the leakage curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/32H02J3/38
CPCH02J3/383H02M1/32H02M7/5387H02M1/0038Y02E10/56
Inventor 廖志凌张凯丁蔓菁崔清华顾赟
Owner 深圳市富嘉新能源有限公司
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