US 11,916,394 B2
Renewable energy system stabilization system and system stabilization support method
Yutaka Kokai, Tokyo (JP); Eisuke Kuroda, Tokyo (JP); and Kunihiko Tsunedomi, Tokyo (JP)
Assigned to HITACHI, LTD., Tokyo (JP)
Appl. No. 17/781,400
Filed by HITACHI, LTD., Tokyo (JP)
PCT Filed Sep. 1, 2020, PCT No. PCT/JP2020/033146
§ 371(c)(1), (2) Date Jun. 1, 2022,
PCT Pub. No. WO2021/124614, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 2019-230923 (JP), filed on Dec. 20, 2019.
Prior Publication US 2023/0012079 A1, Jan. 12, 2023
Int. Cl. H02J 3/38 (2006.01); H02J 3/00 (2006.01)
CPC H02J 3/381 (2013.01) [H02J 3/003 (2020.01); H02J 3/004 (2020.01); H02J 3/0012 (2020.01); H02J 2300/20 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A renewable energy system stabilization system supporting operation of a power system connecting a load and at least one of a first power source including a thermal power generator generating electricity using at least thermal power as power generation energy and a second power source including a renewable energy apparatus generating electricity with renewable energy, the system comprising:
an operation limit value management unit managing an operation limit value related to power flow power of system equipment; and
a determination unit calculating a power flow state for each set time of future of the power system based on load dispatching information including a power generation plan value of the first power source, a predicted value of output of the second power source, and a predicted value of power demand in the power system and determining whether or not stable is each calculated power flow state by comparing each calculated power flow state with the operation limit value, wherein
the determination unit sequentially changes first output power of the first power source defined by the power generation plan value of the first power source, calculates each of the power flow states based on power including the changed first output power and the predicted value of the output of the second power source, and outputs a result of the calculation to the operation limit value management unit, and
on condition that a positive determination result is obtained from the determination unit, the operation limit value management unit manages the operation limit value at each set time of the future as a sum of the changed first output power and the predicted value of the output of the second power source added to the changed first output power.