US 11,909,217 B2Granted

Energy storage system and photovoltaic energy storage system

AssigneeHuawei Technologies Co., Ltd.

InventorsYanzhong Zhang, Xun Wang

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Abstract

The present disclosure discloses an energy storage system. The energy storage system includes M cell strings, N energy storage converters, first ends of the N energy storage converters are coupled to at least one of the M cell strings, and second ends of the N energy storage converters are configured to connect to a power grid. A first end of a first energy storage converter is coupled to Q cell strings in the M cell strings, and the first energy storage converter includes a DC/AC conversion unit and at least one DC/DC conversion unit. A first DC/DC conversion unit is coupled to at least one of the Q cell strings by using the first end of the first energy storage converter, the first DC/DC conversion unit is coupled to the DC/AC conversion unit, and the DC/AC conversion unit is coupled to the power grid by using a second end of the first energy storage converter. The first DC/DC conversion unit is configured to perform adaptation between a voltage of the DC/AC conversion unit and a voltage of a cell string. Therefore, a cell capacity is fully used, and a waste of the cell capacity is reduced.

Claims25

Dependent claims

An energy storage system, wherein the energy storage system comprises M cell strings and N energy storage converters, a first end of any one of the N energy storage converters is coupled to at least one of the M cell strings, a second end of the any energy storage converter is configured to connect to a power grid, and M and N are integers greater than 0, and M≥N;

a first end of a first energy storage converter is coupled to Q cell strings in the M cell strings, the first energy storage converter comprises a direct current/alternating current DC/AC conversion unit and at least one direct current/direct current DC/DC conversion unit, Q is an integer greater than 0, Q≤M, and the first energy storage converter is any one of the N energy storage converters;
and
a first DC/DC conversion unit is coupled to at least one of the Q cell strings using the first end of the first energy storage converter, the first DC/DC conversion unit is coupled to the DC/AC conversion unit, the DC/AC conversion unit is coupled to the power grid by using a second end of the first energy storage converter, and the first DC/DC conversion unit is any one of the at least one DC/DC conversion unit, wherein
the first DC/DC conversion unit is configured to perform adaptation between a voltage of the DC/AC conversion unit and a voltage of at least one of the Q cell strings.

1 more element

An energy storage system, wherein the energy storage system comprises M cell strings, N direct current/alternating current DC/DC power conversion devices, and at least one DC/AC power conversion device, a first end of any one of the N DC/DC power conversion devices is coupled to at least one of the M cell strings, a second end of the any DC/DC power conversion device is coupled to a first end of one of the at least one DC/AC power conversion device, a second end of the DC/AC power conversion device is configured to connect to a power grid, and M and N are integers greater than 0, and M≥N;

a first end of a first DC/DC power conversion device is coupled to Q cell strings in the M cell strings, the first DC/DC power conversion device comprises at least one DC/DC conversion unit, the first DC/DC power conversion device is any one of the N DC/DC power conversion devices, Q is an integer greater than 0, and Q≤M;
a first DC/DC conversion unit is coupled to at least one of the Q cell strings using the first end of the first DC/DC power conversion device, the first DC/DC conversion unit is coupled to a first end of one of the at least one DC/AC power conversion device using a second end of the first DC/DC power conversion device, and the first DC/DC conversion unit is any one of the at least one DC/DC conversion unit;
and
the first DC/DC conversion unit is configured to perform adaptation between a voltage of one of the at least one DC/AC power conversion device and a voltage of at least one of the Q cell strings.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 17/478,561Filed 17 Sep 2021 · continuation
Priority: CN 202010076994.023 Jan 2020
Published: US 2022/0006299 A16 Jan 2022
Granted: 20 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

H02J 3/46
Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised…
H02J 3/32
Arrangements for balancing of the load in networks by storage of energy: using batteries or super capacitors with converting means
H02J 3/34
Circuit arrangements for AC mains or AC distribution networks: arrangements for transfer of electric power between networks of substantially…
H02J 3/381
Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised…

Family

PCT/CN2021/072818Parent of this continuation · filed 20 Jan 2021
US 2022/0006299 A1Pre-grant publication · published 6 Jan 2022
US 11,909,217 B2This patent

From the US filing history. Foreign family members aren’t listed.

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