A high-efficiency h-bridge photovoltaic inverter based on voltage and current polarity detection
A photovoltaic inverter and polarity detection technology, applied in photovoltaic power generation, AC power input conversion to DC power output, electrical components, etc., can solve problems such as common-mode voltage fluctuations, personal safety hazards, and common-mode leakage currents. Achieve the effects of suppressing size, improving efficiency, and reducing conduction loss
Active Publication Date: 2016-03-23
SHANDONG UNIV
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[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-bridge inverter, if the unipolar switching modulation strategy is adopted, the common-mode Large fluctuations in voltage, which in turn cause serious common-mode leakage current problems
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[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0041] The equivalent circuit diagram of the common mode circuit 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 polarity are the same, S1 and S2 act at high frequency, and S6 is turned on, and when it is detected that the voltage and current polarity are opposite, S6 remains on. On state, S5 and S1, S2 complementary high-frequency action. I...
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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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IPC IPC(8): H02M7/5387H02M1/12H02J3/38
CPCH02J3/383H02M7/5387Y02E10/56
Inventor 高峰周立为
Owner SHANDONG UNIV