Abstract
With the proportion of air conditioners increasing gradually, they can provide a certain amount of frequency-controlled reserves for a micro-grid. Optimizing utilization of air conditioners and considering load response characteristics and customer comfort, the frequency adjustment model is a quadratic function model between the trigger temperature of the air conditioner compressor, and frequency variation is provided, which can be used to regulate the trigger temperature of the air conditioner when the micro-grid frequency rises and falls. This frequency adjustment model combines a primary frequency modulation method and a secondary frequency modulation method of the energy storage system, in order to optimize the frequency of a micro-grid. The simulation results show that the frequency modulation strategy for air conditioners can effectively improve the frequency modulation ability of air conditioners and frequency modulation effects of a micro-grid in coordination with an energy storage system.
Highlights
The capacity of micro-grids that accept intermittent energy is growing rapidly and the use of thermostatically controlled loads is increasing gradually [1], which makes it difficult to ensure the stability of the grid frequency
The micro-grid system consists of a photovoltaic system, wind generator, battery, uncontrollable loads and air conditioners as representative of thermostatically controlled loads
Taking air conditioning’s participation in system frequency regulation as an example, a 0.4 kv isolated micro-grid is built by using DIgSILENT software
Summary
The capacity of micro-grids that accept intermittent energy is growing rapidly and the use of thermostatically controlled loads (e.g., air conditioners) is increasing gradually [1], which makes it difficult to ensure the stability of the grid frequency. Incontrolling [7,8,9], considering customer comfort, a variable participation degree frequency regulation through thermostatically controlled loads. The relevant regulation of micro-grid in coordination with energy storage system (ESS), which can improve research mainly focuses on verifying thermostatically controlled loads participate in primary the system frequency effect. In this paper, taking airisconditioners an example, the frequency regulation method for controllable air conditioners is proposed to regulate the frequency of the micro-grid in coordination with the primary frequency modulation method of the battery. When micro-grid frequency considers two factors: the optimal utilization for the cluster air conditioner and customer comfort. Whenthe micro-grid frequency increases, the triggerdecreases temperature of air conditioning thedecreases air conditioner frequency regulation method can further optimize frequency modulation results in based on its set value. Optimize frequency resultssystem's in coordination with frequency the energy modulation storage system's secondary frequency modulation method
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