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A common-ground leakage-current-free non-isolated photovoltaic grid-connected inverter circuit and control method

A technology of inverter circuit and control method, applied in AC network circuits, photovoltaic power generation, circuit devices, etc., can solve problems such as earth leakage current, and achieve the effect of eliminating leakage current, low loss and simple topology structure

Inactive Publication Date: 2019-01-11
JIANGSU UNIV
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Problems solved by technology

[0005] Aiming at the problem of relatively large ground leakage current in single-phase non-isolated photovoltaic grid-connected inverters, the present invention proposes a common-ground type no-leakage current non-isolated photovoltaic grid-connected inverter circuit and control method

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  • A common-ground leakage-current-free non-isolated photovoltaic grid-connected inverter circuit and control method
  • A common-ground leakage-current-free non-isolated photovoltaic grid-connected inverter circuit and control method
  • A common-ground leakage-current-free non-isolated photovoltaic grid-connected inverter circuit and control method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments of the present invention.

[0023] like figure 1 As shown, the common model non-leakage current non-isolated photovoltaic grid-connected inverter circuit topology schematic diagram provided by the present invention includes: voltage stabilizing capacitor C in , the flying capacitor C FC , the first switching tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , the fifth switch tube S 5 and filter inductor L 1 .

[0024] The first switch tube S 1 The collector of the photovoltaic cell is connected to the positive electrode of the photovoltaic cell and the voltage stabilizing capacitor C in The anode and the third switching tube S 3 The collector is connected, the second switch S 2 The collectors are connected to the flying capacitor C FC The anode and the first switching tube S 1 The emitter is connec...

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Abstract

The invention discloses a common-ground leakage-current-free non-isolated photovoltaic grid-connected inverter circuit and a control method, belonging to the field of power electronics, comprising a voltage stabilizing capacitor Cin, a flying capacitor CFC, five switching transistors S1, S2, S3, S4, S5 and a filter inductor L1. The inverter uses a simple unipolar sinusoidal pulse width modulationtechnique to modulate the inverter to reduce switching losses, output current ripple and reduce filtering requirements. Photovoltaic cells are charged to fly-over capacitors by switching tubes in thepositive half-cycle of the grid voltage, and are powered by fly-over capacitors in the negative half-cycle of the grid voltage. As that zero point of the power grid of the invention is directly connected with the negative terminal of the photovoltaic cell, the common mode voltage is kept at zero, and the leakage current can only be restrain compared with other topologies.

Description

technical field [0001] The invention belongs to the technical field of power electronic photovoltaic grid-connected power generation, and specifically relates to a common-ground non-leakage current non-isolated photovoltaic grid-connected inverter circuit and a control method. Background technique [0002] With the depletion of traditional energy sources, it is imminent to seek new energy sources. Solar energy has become the first choice for new energy workers due to its endless and safe and reliable features. Single-phase non-isolated photovoltaic grid-connected inverters are small in size, light in weight, and low in cost, which can greatly improve efficiency, and have become one of the mainstreams of research on photovoltaic grid-connected power generation systems. [0003] However, photovoltaic cells have parasitic capacitance to the ground. Since there is no transformer isolation, high-frequency voltage fluctuations will be generated on the parasitic capacitance, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/537H02J3/38
CPCH02J3/383H02M7/537Y02E10/56
Inventor 廖志凌曹晨晨邱殿成徐长波
Owner JIANGSU UNIV
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