Battery Charge Control Schemes for Increased Grid Compatibility of Decentralized PV Systems

As grid price rises and the feed-in tariff declines, the economics of local storage become in creasingly lucrative to the system owner. The attractiveness o f a local storage investment is compounded in the p resence of a PV grid injection cap. The larger the PV system size i s relative to this cap level, the greater the oppor tunity exists to charge the local storage with PV production that wo uld otherwise be dissipated without credit. This st udy utilizes two household demand profiles that represent the extrem es of the potential for local PV self-consumption a nd, consequently, the range of economic potential that exists for local storage to be coupled with residen tial PV systems. A series of algorithms were subsequently developed to analyze the related benefit potential of delayed storage charging to target instances of excess PV productio n depending upon the grid injection cap.