Photovoltaic system having master and slave converters and control method of the same
AssigneeSungrow Power Supply Co., Ltd.
InventorsShuai Sun, Anran He, Peng Chen, Zhicheng Wang, Xuebing Chen
Life of this patent
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Abstract
A photovoltaic system and a control method. The photovoltaic system includes a master DC/DC converter; a slave DC/DC converter; a master DC/AC converter; and a slave DC/AC converter. The master DC/AC converter is configured to send a current instruction value and an input voltage of the master DC/AC converter to the slave DC/AC converter; and the slave DC/AC converter is configured to control an output current, based on an input voltage of the slave DC/AC converter, the current instruction value, and the input voltage of the master DC/AC converter, so that a current through the N wire is less than a preset current.
Claims20
A photovoltaic system, comprising:
- a master DC/DC converter;
- a slave DC/DC converter;
- a master DC/AC converter;
- and
- a slave DC/AC converter;
- wherein
- an input terminal of the master DC/DC converter is configured to be connected to a photovoltaic array, a positive output terminal of the master DC/DC converter is connected to a positive input terminal of the master DC/AC converter, a negative output terminal of the master DC/DC converter is connected to an N wire, and a negative input terminal of the master DC/AC converter is connected to the N wire;
- a negative input terminal of the slave DC/DC converter is connected to the negative output terminal of the master DC/DC converter, and a positive input terminal of the slave DC/DC converter is connected to the positive output terminal of the master DC/DC converter, a positive output terminal of the slave DC/DC converter is connected to the N wire, a negative output terminal of the slave DC/DC converter is connected to a negative output of the slave DC/AC converter, and a positive output terminal of the slave DC/AC converter is connected to the N wire;
- the master DC/AC converter is configured to send a current instruction value and an input voltage of the master DC/AC converter to the slave DC/AC converter;
- and
- the slave DC/AC converter is configured to control an output current, based on an input voltage of the slave DC/AC converter, the current instruction value, and the input voltage of the master DC/AC converter, so that a current through the N wire is less than a preset current.
A control method for a photovoltaic system, wherein the photovoltaic system comprises a master DC/DC converter, a slave DC/DC converter, a master DC/AC converter and a slave DC/AC converter;
- wherein an input terminal of the master DC/DC converter is configured to be connected to a photovoltaic array, a positive output terminal of the master DC/DC converter is connected to a positive input terminal of the master DC/AC converter, a negative output terminal of the master DC/DC converter is connected to an N wire, and a negative input terminal of the master DC/AC converter is connected to the N wire;
- a negative input terminal of the slave DC/DC converter is connected to the negative output terminal of the master DC/DC converter, and a positive input terminal of the slave DC/DC converter is connected to the positive output terminal of the master DC/DC converter, a positive output terminal of the slave DC/DC converter is connected to the N wire, a negative output terminal of the slave DC/DC converter is connected to a negative output of the slave DC/AC converter, and a positive output terminal of the slave DC/AC converter is connected to the N wire;
- wherein the control method comprises:
- controlling the master DC/AC converter to send a current instruction value and an input voltage of the master DC/AC converter to the slave DC/AC converter;
- and
- controlling the slave DC/AC converter to control an output current, based on an input voltage of the slave DC/AC converter, the current instruction value, and the input voltage of the master DC/AC converter, so that a current through the N wire is less than a preset current.
Dependencies are inferred from the claim text.