Improved main circuit structure of photovoltaic synchronization inverter

A main circuit, an improved technology, applied in the direction of photovoltaic power generation, single-network parallel feeding arrangement, electrical components, etc., can solve problems such as considerable impact

CN102130623AInactive Publication Date: 2011-07-20GIANT IND TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-07-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an improved main circuit structure of a photovoltaic synchronization inverter. The improved main circuit structure comprises a photovoltaic (PV) battery board, a capacitor Cin, distributed capacitors C1 and C2, a non-isolation direct-current / direct-current (DC / DC) converter, a capacitor C, an H bridge consisting of power switching devices V1, V2, V3 and V4, and diodes D1, D2, D3 and D4 which correspond to one another one to one, an afterflow loop on the voltage positive half circle of a power grid consisting of a power switching device V5 and diodes D5 and D7, an afterflow loop on the voltage negative half circle of the power grid consisting of a power switching device V6 and diodes D6 and D8, a filter circuit consisting of inductors Lf1 and Lf2 and a capacitor Cf,and a common mode resistant voltage filter H-bridge capacitor group consisting of capacitors C3, C4, C5 and C6. A synchronization inversion circuit for executing the improved main circuit structure has the advantages of capability of effectively restraining common mode voltage / current, high inversion efficiency, small volume, light weight, low electromagnetic noise and the like.
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Description

technical field

[0001] The invention relates to a grid-connected inverter circuit, in particular to an improved photovoltaic grid-connected inverter main circuit structure, which can be used for photovoltaic grid-connected power generation, communication power supply and other devices. Background technique

[0002] Non-isolated grid-connected inverters have the advantages of small size, light weight, low cost, and high efficiency, and have attracted widespread attention from the industry. However, due to the distributed capacitance of the photovoltaic panel to the ground, the high-frequency common-mode voltage generated by the power switching device of the main circuit of the photovoltaic grid-connected inverter acts on the distributed capacitance, resulting in a relatively large gap between the photovoltaic panel and the ground. A large leakage current is generated, and the leakage current even exceeds the range specified by the relevant standards. The generation of high-f...

Examples

Embodiment 2

[0056] Such as Figure 13 Shown, L f1 The other end of the capacitor C f One end of the EMI filter is connected to node G; L f2 The other end of the capacitor C f The other end of the EMI filter is connected to the node H; one is connected by the capacitor C 3 、C 4 、C 5 、C 6 composed of H-bridge capacitor banks, where C 5 one end of the C 6 One end of the EMI filter, one output end of the EMI filter, and the L end of e are connected; C 3 one end of the C 4 One end of the EMI filter, the other output end of the EMI filter, the N end of e and the ground connection; C 5 the other end of the C 3 The other end of the PV is connected to the node C; C 6 the other end of the C 4 The other end of the PV and the negative pole of the PV are connected to the node D.

Embodiment 3

[0058] Such as Figure 14 Shown, L f1 the other end of the C f One end of e is connected to the L end of e; L f2 the other end of the C f The other end, the N end of e and the ground are connected; one is connected by the capacitor C 3 、C 4 、C 5 、C 6 composed of H-bridge capacitor banks, where C 5 one end of the C 6 end of the L f1 The other end is connected to the node L; C 3 one end of the C 4 end of the L f2 The other end of is connected to node N; C 5 the other end of the C 3 The other end of the PV is connected to the node C; C 6 the other end of the C 4 The other end of the PV and the negative pole of the PV are connected to the node D.

Embodiment 4

[0060] Such as Figure 15 Shown, L f1 the other end of the C f One end of the EMI filter and one input end of the EMI filter are connected to the node G; L f2 the other end of the C f The other end of the EMI filter and the other input end of the EMI filter are connected to node H; one output end of the EMI filter is connected to the L end of e; the other output end of the EMI filter is connected to the N end of e and the ground; by capacitance C 5 、C 6 composed of a half H-bridge capacitor bank, where C 5 one end of the C 6 end of the L f1 The other end is connected to node G; C 5 The other end of the PV is connected to the positive pole of the node C; C 6 The other end of the node is connected to the negative pole of PV at node D.