Tag Archives: Analysis of inverter topology leakage current suppression mechanism

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Leakage current suppression technology of PV grid-connected inverter, ,
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Leakage current suppression of three-phase grid-connected inverter

The previous article analyzed the analysis and improvement of leakage current analysis model, leakage current suppression methods and various topologies based on single-phase non-isolated photovoltaic grid-connected inverters, but the summarized leakage current model and suppression approach can also be analogized to a three-phase grid-connected inverter. Topology using inhibitory pathway A 1. Add an isolation transformer Like […]

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Leakage current suppression technology of PV grid-connected inverter,
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Bridge inverter topology with suppression path C

1. Half-bridge inverter topology In Figure 1, if the bridge arm 1 is a capacitor branch and the bridge arm 2 is a power tube, it constitutes a single-phase half-bridge inverter circuit. The driving logic is shown in Figure 3, that is, the upper and lower tubes of the bridge arm 2 are turned on […]

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Leakage current suppression technology of PV grid-connected inverter, ,
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Bridge type inverter topology adopting suppression path B

1. Adopt bipolar SPWM full-bridge inverter Commonly used SPWM strategies for single-phase full-bridge grid-connected inverters include unipolar SPWM, unipolar frequency doubling SPWM and bipolar SPWM. Since the unipolar SPWM strategy has many combinations, the table shows that the upper and lower tubes of the bridge arm 1 in Figure 1 are high-frequency tubes, and the […]

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Leakage current suppression technology of PV grid-connected inverter, ,
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Analysis of leakage current suppression mechanism of Heric change topology and double parallel Buck inverter topology

1. Heric change topology 1 Figure 1 shows a non-isolated topology based on the Heric structure. This topology moves a freewheeling switch in the Heric topology to a group of bridge arms. Using the unipolar SPWM strategy shown in Figure 2, in the power transmission stage, current flows through S3-S2 (positive direction) and S1-S5-S4 (negative direction); In […]

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Leakage current suppression technology of PV grid-connected inverter, ,
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Analysis of leakage current suppression mechanism of H5 changing topology

1. H5 change topology 1 Figure 1 is a circuit structure of a six-switch non-isolated inverter, using the unipolar SPWM strategy shown in Figure 2. This topology adds a switch tube based on the H5 topology. In the power transmission phase, current flows through S5-S1-S4 (positive direction) and S6-S2 (negative direction); in the freewheeling phase, the current flows […]

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