US 12,261,566 B2
Photovoltaic system
Yanzhong Zhang, Shanghai (CN); and Zhenhuan Shu, Shanghai (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Guangdong (CN)
Filed on Jan. 13, 2022, as Appl. No. 17/575,537.
Application 17/575,537 is a continuation of application No. PCT/CN2020/074487, filed on Feb. 7, 2020.
Prior Publication US 2022/0140781 A1, May 5, 2022
Int. Cl. H02S 40/32 (2014.01); H02S 40/38 (2014.01)
CPC H02S 40/32 (2014.12) [H02S 40/38 (2014.12)] 9 Claims
OG exemplary drawing
 
1. A photovoltaic system, comprising:
a plurality of photovoltaic strings, wherein each of the plurality of photovoltaic strings comprises a photovoltaic string direct current (DC) output terminal;
a junction device, connected to photovoltaic string DC output terminals of at least two of the plurality of photovoltaic strings and comprising a plurality of input terminals and at least two output terminals, wherein the junction device is configured to output at least two mutually independent DC outputs by converging a power from the plurality of input terminals of the junction device to the at least two output terminals of the junction device, a quantity of the plurality of input terminals of the junction device is greater than a quantity of the at least two output terminals of the junction device;
a direct current power distribution cabinet comprising a plurality of first switches and a direct current bus, wherein input terminals of the plurality of first switches are coupled to respective output terminals of the junction device and output terminals of the plurality of first switches are coupled to the direct current bus; and
at least one inverter, coupled to the direct current bus of the direct current power distribution cabinet and configured to convert DC from the direct current bus into an alternating current (AC);
wherein the at least one inverter comprises a plurality of DC-AC conversion circuits coupled to the direct current bus, charging and discharging process of the energy storage apparatus is controlled by a control system based on total input power of the plurality of DC-AC conversion circuits and maximum total input power value of the plurality of DC-AC conversion circuits, and
wherein the charging and discharging process comprises:
when total output power of the junction device is greater than the total input power of the plurality of DC-AC conversion circuits, the energy storage apparatus is configured to charge an energy storage battery of the energy storage apparatus; and
when the total output power of the junction device is greater than the maximum total input power value of the plurality of DC-AC conversion circuits, the energy storage apparatus is configured to discharge the energy storage battery.