A Basic Study of a Coordinated Control Method for Heat Pump Water Heaters and Electric Vehicle Battery Chargers in Residence with PV Systems

Abstract

In recent years, Photovoltaic generation (PV) has gained a lot of attention due to its potential for contributing to part of the solution to global warming. In addition, the introduction of PV increased rapidly in many houses. If PV is introduced on a large scale, this may cause the allowable voltage produced by each customer to increase thereby deviate the allowable voltage. The installation of a storage battery can decrease the PV's output and control power surges. However, there are serious problems in respect to the installation cost and storage space of batteries. Therefore in this research, the authors propose and verify a new coordinated control method of heat-pump water heaters and electric vehicle battery chargers in a residence with a PV system. The proposed method compensates for the voltage rises and drops deviating from the allowable range by coordinated control of heat-pump water heaters and electric vehicle battery chargers. In order to verify the proposed method, an experimental simulation using an analog type distribution system simulator is carried out.