Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof
A technology of full-bridge inverters and switch tubes, applied in photovoltaic power generation, single-network parallel feeding arrangement, etc., can solve problems such as common-mode current threatening personal safety, large parasitic capacitance, and large common-mode voltage
Inactive Publication Date: 2011-06-08
SOUTHEAST UNIV
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Problems solved by technology
However, the non-isolated photovoltaic power generation system has a large parasitic capacitance due to the large area occupied by the photovoltaic panel, and the unipolar modulation has a large common-mode voltage compared with the bipolar modulation. There is no power frequency transformer or high frequency transformer isolation Under the circumstances, it may cause a large common mode current to threaten personal safety
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[0023] The present invention will be further described below in combination with specific embodiments and with reference to the accompanying drawings.
[0024] figure 1 The grid-connected six-switch tube full-bridge topology circuit proposed by the present invention includes a parallel circuit with an input DC power supply and a parallel circuit with an AC power grid. Parallel circuit with input power supply, including two parallel branches, the order of connection of the first branch is: positive terminal of power supply, first switching tube, fifth switching tube, third switching tube, negative terminal of power supply; second branch The order of circuit connection is: power supply positive terminal, second switching tube, sixth switching tube, fourth switching tube, and power supply negative terminal. The parallel circuit with the AC grid includes two parallel branches, the first branch is composed of the first filter inductor, the AC grid, the second filter inductor,...
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The invention relates to a photovoltaic synchronization grid full bridge six-switching tube inverter and a control method thereof, maintaining a high efficiency characteristic of a unipolar modulation power frequency transformer isolation free four-switching tube full-bridge inverter by utilizing a unipolar modulation strategy, simultaneously a common-mode voltage is small. The photovoltaic grid full-bridge inverter comprises a direct current power supply parallel circuit at an input end and an alternating current power supply parallel circuit at an output end; the direct current power supply parallel circuit at an input end comprises two parallel branches, the alternating current power supply parallel circuit at an output end comprises two parallel branches, when the switching tube for a high frequency operation is turned off under control, an inductance current flows through an additional diode branch, thereby efficiently inhibiting current leakage of the photovoltaic grid full-bridge inverter, simultaneously the inverter has the characteristic of high efficiency.
Description
technical field [0001] The invention relates to a DC and AC inverter, in particular to a photovoltaic grid-connected inverter, which belongs to a power electronic converter. [0002] Background technique [0003] Photovoltaic power generation has the characteristics of sustainable development and environmental friendliness, and has advantages in dealing with energy and environmental crises. Generally, the standard topology of grid-connected power generation inverters is a four-switch full-bridge structure, which generates power through a power frequency isolation transformer or directly grid-connected. Since the power frequency isolation transformer increases the system cost, is not conducive to weight and volume optimization, and has low efficiency, the four-switch full-bridge topology is the preferred solution for small and medium power photovoltaic grid-connected systems. To further optimize efficiency, unipolar modulation is used more in practice than bipolar modulatio...
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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 王建华嵇保健赵剑锋
Owner SOUTHEAST UNIV