Modeling and Analysis of Adjustable Capacity of Public Building Aggregated Virtual Power Plant

Abstract

With the proposal of the construction goal of the new power system, it is expected that China's power grid will usher in the future large-scale new energy grid connection by 2030. As a result, the randomness and volatility of the power supply side will gradually increase. It is urgent to tap the potential of flexible regulation of load side resources and promote the transformation of power grid from source to load to source network interaction. Due to the thermal inertia of the building itself and the good regulation ability of the building automatic control system, the central air conditioning system of large public buildings is the largest load side adjustable resource pool of the urban power grid. This paper first makes a refined modeling of the central air-conditioning refrigeration system, quantifies the influence of different adjustment parameters on the adjustable potential of the central air-conditioning system, and then analyzes the influence of different comfort requirements on the maximum power regulation and steady-state power regulation of the central air-conditioning refrigeration system under the control mode of “constant flow and variable temperature difference” selected by the air-conditioning. Finally, taking actual air-condition system as an example, the adjustable potential of virtual power plants formed by the aggregation of urban buildings is evaluated, and the adjustable potential of various types of buildings is formed, which provides a reference basis for virtual power plants to screen adjustable resources.