Establishment and analysis of micro-net model considering the enhancement of photovoltaic power utilization for air-source heat pump

Abstract

Since the stability of the power grid and the quality of electricity supply can be affected, the intermittent and unpredictable features make the renewable energy generation cannot be absorbed by the power grid easily and completely. "Abandoning the wind and solar power" phenomenon also becomes more serious in recent years. As an efficient thermoelectric conversion device, the heat pump system can couple thermal energy and electricity to eliminate excess electricity of the system theoretically. However, the influence of the heat pump technology on the microgrid system which needs to be analysed case by case lacks a unified evaluation method. Therefore, based on the Energy PLAN, an energy microgrid model of an ecological region in Qingdao is established to study the impact on the renewable energy integration and the enhancement of renewable energy utilization through applying the air-source heat pump system. The simulation results showed that the maximum photovoltaic penetration rate in the region is 19.23% initially. After applying the air-source heat pump, the photovoltaic capacity corresponding to the critical point of 100% renewable energy utilization is in direct proportion to the heat pump capacity. Additionally, the maximum photovoltaic penetrations can reach 25%. In this paper, we also propose relevant suggestions for the designing and building of the micro-net energy system.