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Efficient H-bridge photovoltaic inverter based on voltage and current polarity detection

A photovoltaic inverter, polarity detection technology, applied in photovoltaic power generation, conversion of AC power input to DC power output, electrical components, etc., can solve the problems of common mode voltage fluctuation, common mode leakage current, personal safety hazards, etc. Achieve the effect of suppressing size, reducing conduction loss and improving efficiency

Active Publication Date: 2015-03-25
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The common-mode leakage current generated by the non-isolated photovoltaic inverter system will seriously endanger personal safety, especially in the traditional single-phase full-

Method used

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  • Efficient H-bridge photovoltaic inverter based on voltage and current polarity detection
  • Efficient H-bridge photovoltaic inverter based on voltage and current polarity detection
  • Efficient H-bridge photovoltaic inverter based on voltage and current polarity detection

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[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] The equivalent circuit diagram of the common mode loop of the traditional H4 bridge photovoltaic grid-connected inverter is as follows figure 1 shown.

[0042] The topology of the present invention is as figure 2 As shown, two switch tubes S5, S6 and two diodes D1, D2 are added on the basis of the traditional H4 bridge inverter circuit. The modulation mode of the switch is divided into four stages in one cycle of the grid voltage, namely mode 1 to mode 4, such as Figure 3 to Figure 6 shown.

[0043]In the negative half cycle of the grid voltage, when it is detected that the inverter output voltage and current have the same polarity, S1 and S2 operate at high frequency, and S6 is turned on, and when the opposite polarity of the voltage and current is detected, S6 remains on. On state, S5 and S1, S2 complementary high-frequency action. In the ...

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Abstract

The invention discloses an efficient H-bridge photovoltaic inverter based on voltage and current polarity detection. The efficient H-bridge photovoltaic inverter is structurally characterized in that direct current side capacitors are connected to the two ends of a photovoltaic cell panel in parallel respectively; the photovoltaic cell panel is connected with an H-bridge inverter; two midpoints of the H-bridge inverter are each connected with a newly added circuit in series. Each newly added circuit comprises a diode and a switching tube connected with the diode in series, wherein the diode is connected between the emitting electrode and the collector of the switching tube. Four leads extend out of the connection point of the H-bridge inverter and each newly added circuit, do not belong to the same branch of the H-bridge inverter, are connected in an inconsistent position mode and are each connected with the two ends of the alternating side through an alternating current side filter inductor. The topology can isolate the photovoltaic cell panel with a power grid in the follow current state, current only flows through the two switching tubes under the power mode, the conduction loss is small, the efficiency is high, a common-mode voltage value is kept constant in the whole power grid period, and therefore the common-mode leak current is restrained.

Description

technical field [0001] The invention relates to a high-efficiency H-bridge photovoltaic inverter based on voltage and current polarity detection. Background technique [0002] In recent years, with the continuous consumption of fossil fuels worldwide, the problem of energy shortage has become increasingly serious. Therefore, the research on renewable energy has attracted more and more attention from all over the world. Solar photovoltaic power generation technology is an important field of renewable energy applications. The photovoltaic inverter is a key part of the grid-connected photovoltaic power generation system. Its main function is to convert the direct current generated by photovoltaic panels into alternating current that is synchronized with the grid. In the solar photovoltaic grid-connected system, the traditional photovoltaic grid-connected inverter generally installs a power frequency transformer at the output end to adjust the voltage and isolate the power grid,...

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Application Information

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IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/383H02M7/5387Y02E10/56
Inventor 高峰周立为
Owner SHANDONG UNIV