# US 12,009,669 B2 · Power feeding system and power management device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,669 B2 - Document ID: US12009669B2 - Status: Granted - Kind: B2 - Application number: 17/640,493 - Filed: 2020-03-25 - Published: 2023-05-18 - Granted: 2024-06-11 - Earliest claimed: 2020-03-25 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Takuma Mitsunaga; Katsuo Naoi; Shingo Suzuki; Hisakazu Uto; Masao Ichi - Web page: https://patentgrep.com/patent/US12009669B2 ## CPC - H02J 3/46: Controlling the sharing of generated power between the generators, sources or networks - H02J 1/12: Parallel operation of DC sources having power converters with further DC sources without power converters - H02J 3/32: using batteries or super capacitors with converting means - H02J 3/38: Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel - H02J 3/381: {Dispersed generators} - H02J 7/34: Parallel operation in networks using both storage and other DC sources, e.g. providing buffering (H02J7/14 takes precedence) - H02J 7/35: with light sensitive cells - H02J 7/865: {Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence)} - H02J 2101/20: Dispersed power generation using renewable energy sources - H02J 2101/24: Photovoltaics - H02J 2101/25: {involving maximum power point tracking control for photovoltaic sources} - H02J 2101/28: Wind energy - H02J 2207/20: Charging or discharging characterised by the power electronics converter - Y02E 70/30: Systems combining energy storage with energy generation of non-fossil origin - 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 feeding system includes a direct current (DC) bus for supplying DC power, a renewable energy power generation device connected to the DC bus, a first converter connected to the DC bus and converting a bus voltage supplied to the DC bus into a load voltage supplied to a load device, a storage battery, a second converter provided between the storage battery and the DC bus and capable of bidirectionally converting the bus voltage and a battery voltage of the storage battery, and a power management device controlling the second converter to charge and discharge the storage battery. The power management device controls the second converter to change the bus voltage based on difference power obtained by subtracting load power supplied to the load device from supply power supplied to the DC bus, the supply power including generated power generated by the renewable energy power generation device. ## Claims ### Claim 1 A power feeding system comprising: a direct current (DC) bus for supplying DC power; a renewable energy power generation device connected to the DC bus; a first converter connected to the DC bus and configured to convert a bus voltage supplied to the DC bus into a load voltage supplied to a load device; a storage battery; a second converter provided between the storage battery and the DC bus and capable of bidirectionally converting between the bus voltage and a battery voltage of the storage battery; and a power management device configured to control the second converter to charge and discharge the storage battery, wherein the power management device controls the second converter to change the bus voltage based on difference power obtained by subtracting load power supplied to the load device from supply power supplied to the DC bus, the supply power including generated power generated by the renewable energy power generation device. ### Claim 2 (depends on 1) The power feeding system according to claim 1, wherein the power management device causes the second converter to change the bus voltage in accordance with a magnitude relationship between the difference power and maximum electric power that can be received by the second converter. ### Claim 3 (depends on 2) The power feeding system according to claim 2, wherein the power management device causes the second converter to change the bus voltage so as to increase the generated power when the difference power is smaller than the maximum electric power. ### Claim 4 (depends on 2) The power feeding system according to claim 2, wherein the power management device causes the second converter to change the bus voltage so as to decrease the generated power when the difference power is larger than the maximum electric power. ### Claim 5 A power management device comprising: a first acquisition unit configured to acquire difference power obtained by subtracting load power supplied to a load device connected to a direct current (DC) bus via a first converter from supply power supplied to the DC bus, the supply power including generated power generated by a renewable energy power generation device connected to the DC bus; and a control unit configured to control a second converter provided between the DC bus and a storage battery to change a bus voltage supplied to the DC bus based on the difference power, wherein the second converter is capable of bidirectionally converting between the bus voltage and a battery voltage of the storage battery. ### Claim 6 (depends on 5) The power management device according to claim 5, further comprising a second acquisition unit configured to acquire maximum electric power of the second converter, wherein the control unit causes the second converter to change the bus voltage in accordance with a magnitude relationship between the difference power and the maximum electric power. ### Claim 7 (depends on 6) The power management device according to claim 6, wherein the control unit causes the second converter to change the bus voltage so as to increase the generated power when the difference power is smaller than the maximum electric power. ### Claim 8 (depends on 6) The power management device according to claim 6, wherein the control unit causes the second converter to change the bus voltage so as to decrease the generated power when the difference power is larger than the maximum electric power.