Utilization of Surplus Electric Power of Photovoltaic Systems by Heat Pump Water Heaters: A Planning Method and Its Effect in an Autonomous Demand Area Power System

Summary Large‐capacity photovoltaic (PV) systems will be installed in future power systems. According to Japan's energy outlook, the target capacity of PV systems for 2030 is about 50 GW. When large‐volume PV systems are installed in a power system, the reverse power flow from PV systems may cause a surplus of electric power. To utilize the surplus electric power without reduction of PV power generation, the operation of customer equipment such as heat pump water heaters (HPWH) according to PV power generation is expected to be one of the solutions. In this paper, a method of cooperative control of customer equipment with PV power generation is proposed, and the effectiveness of the proposed control is evaluated by simulation analyses.