# US 2025/0158413 A1 · Power conversion system and power update control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0158413 A1 - Document ID: US20250158413A1 - Status: Published application - Kind: A1 - Application number: 18/945,940 - Filed: 2024-11-13 - Published: 2025-05-15 - Earliest claimed: 2023-11-14 - Assignees: Huawei Digital Power Technologies Co., Ltd. - Applicants: Huawei Digital Power Technologies Co., Ltd. - Inventors: Zisen QU; Mingquan Zhao; Meiqing Zhang; Kai Xin; Yunfeng Liu - Web page: https://patentgrep.com/patent/US20250158413A1 ## CPC - H02J 3/381: {Dispersed generators} - H02J 1/102: being switching converters (H02J1/108, H02J1/12 take precedence) - H02J 2101/25: {involving maximum power point tracking control for photovoltaic sources} - Y02E 10/56: Power conversion systems, e.g. maximum power point trackers - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A power conversion system including N power conversion units and a control unit, which can control, in a control periodicity, operating modes of one or more target power conversion units in the N power conversion units to be switched between a PR mode and an MPPT mode, and update a reference power based on a maximum power obtained in the MPPT mode, for an operating power of the target power conversion unit obtained in the PR mode to be an updated reference power, and the updated reference power is less than or equal to the maximum power. In addition, the control unit further controls an operating mode of a power conversion unit other than the target power conversion unit in the N power conversion units to remain unchanged, so that the power conversion unit other than the target power conversion unit does not perform mode switching. ## Claims ### Claim 1 A power conversion system; comprising: N power conversion units and a control unit, wherein N is an integer and N≥2, a first terminal of each power conversion unit is configured to connect to a direct current power supply or an alternating current power supply, a second terminal of each power conversion unit is configured to connect to a load, an energy storage unit, or a power grid, and the power conversion unit is configured to: perform conversion on a direct current input by the direct current power supply or an alternating current input by the alternating current power supply, and then output a current obtained through the conversion; and the control unit is configured to: control, in a control periodicity, operating modes of one or more target power conversion units in the N power conversion units to be switched between a power reserve (PR) mode and a maximum power point tracking (MPPT) mode, and update a reference power based on a maximum power obtained in the MPPT mode, for an operating power of the target power conversion unit obtained after switching from the MPPT mode to the PR mode to be an updated reference power, wherein the updated reference power is less than or equal to the maximum power; and control an operating mode of a power conversion unit other than the target power conversion unit in the N power conversion units to remain unchanged. ### Claim 2 (depends on 1) The power conversion system according to claim 1, wherein the target power conversion unit is one or more power conversion units randomly selected from the N power conversion units. ### Claim 3 (depends on 1) The power conversion system according to claim 1, wherein each probability of selecting a portion of the power conversion units as the target power conversion unit is different. ### Claim 4 (depends on 2) The power conversion system according to claim 2, wherein the control unit is further configured to: obtain a selection probability of each power conversion unit; and randomly select the target power conversion unit from the N power conversion units based on the selection probability of each power conversion unit. ### Claim 5 (depends on 4) The power conversion system according to claim 4, wherein the control unit is further configured to: receive a probability adjustment instruction; and adjust a selection probability of at least a part of the power conversion units based on the probability adjustment instruction. ### Claim 6 (depends on 1) The power conversion system according to claim 1, wherein the target power conversion unit is one or more power conversion units selected from the N power conversion units in a fixed sequence. ### Claim 7 (depends on 6) The power conversion system according to claim 6, wherein the N power conversion units comprise a first unit group to an Mth unit group that are disposed in sequence, any unit group comprises one or more power conversion units, and M is an integer and M≥2; a plurality of consecutive cycle periodicities comprise one or a combination of a first cycle periodicity and a second cycle periodicity; in the first cycle periodicity, one unit group sequentially selected based on a sequence from the first unit group to the Mth unit group is used as the target power conversion unit; and in the second cycle periodicity, one unit group sequentially selected based on a sequence from the Mth unit group to the first unit group is used as the target power conversion unit. ### Claim 8 (depends on 7) The power conversion system according to claim 7, wherein when the plurality of cycle periodicities comprises the first cycle periodicity and the second cycle periodicity, and the first cycle periodicity and the second cycle periodicity occur alternately. ### Claim 9 (depends on 1) The power conversion system according to claim 1, wherein the updated reference power is equal to a target maximum power minus a reserved power; and the target maximum power is a maximum power in or a maximum power average value of maximum powers of the one or more target power units. ### Claim 10 (depends on 9) The power conversion system according to claim 9, wherein the reserved power is a constant value. ### Claim 11 (depends on 1) The power conversion system according to claim 1, wherein the operating mode of the power conversion unit other than the target power conversion unit in the N power conversion units is the PR mode, and an operating power of the power conversion unit other than the target power conversion unit is updated with the updated reference power. ### Claim 12 A power update control method applied to a power conversion system, the power conversion system comprises N power conversion units, N is an integer and N≥2, a first terminal of each power conversion unit is configured to connect to a direct current power supply or an alternating current power supply, a second terminal of each power conversion unit is configured to connect to a load, an energy storage unit, or a power grid, and the power conversion unit is configured to: perform conversion on a direct current input by the direct current power supply or an alternating current input by the alternating current power supply, and then output a current obtained through the conversion; and the power update control method comprises: controlling operating modes of one or more target power conversion units in the N power conversion units to be switched between a power reserve PR mode and a maximum power point tracking MPPT mode; and updating a reference power based on a maximum power obtained in the MPPT mode, for an operating power of the target power conversion unit obtained after switching from the MPPT mode to the PR mode to be an updated reference power, wherein the updated reference power is less than or equal to the maximum power; and controlling an operating mode of a power conversion unit other than the target power conversion unit in the N power conversion units to remain unchanged. ### Claim 13 (depends on 12) The power update control method according to claim 12, wherein the target power conversion unit is one or more power conversion units randomly selected from the N power conversion units. ### Claim 14 (depends on 12) The power update control method according to claim 12, wherein each probability of selecting a portion of the power conversion units as the target power conversion unit is different. ### Claim 15 (depends on 1) The power conversion system according to claim 1, wherein the updated reference power is equal to a target maximum power multiplied by a reference percentage and the target maximum power is a maximum power in or a maximum power average value of maximum powers of the one or more target power units. ### Claim 16 (depends on 9) The power conversion system according to claim 9, wherein the reserved power is equal to the target maximum power multiplied by a percentage. ### Claim 17 (depends on 1) The power conversion system according to claim 1, wherein the operating mode of the power conversion unit other than the target power conversion unit in the N power conversion units is the MPPT mode, and an operating power of the power conversion unit other than the target power conversion unit is the maximum power obtained in the MPPT mode. ### Claim 18 (depends on 1) The power conversion system according to claim 1, wherein, in power conversion units other than the target power conversion unit in the N power conversion units, an operating mode of a part of the power conversion units is the PR mode, an operating power of the part of the power conversion units is an updated reserved power, an operating mode of a remaining power conversion unit is the MPPT mode, and an operating power of the remaining power conversion unit is the maximum power obtained in the MPPT mode.