計及用戶舒適度的空調負荷參與電力系統(tǒng)頻率控制研究
[Abstract]:Traditionally, the power system makes use of the reserve resources of the generation side to adjust the frequency, and the frequency adjustment and the secondary adjustment can meet the frequency quality requirements of the power system at various time scales. However, with the change of generation side structure, especially the increase of power generation ratio of nuclear power and intermittent energy, the capacity of generating side to provide reserve is decreased. At the same time, the economic cost and environmental cost of power generation of large capacity thermal power units are increasing day by day. It is not enough to rely on the generation side resources to adjust the frequency, and the potential of exploiting the load side resources has been paid more and more attention. Air conditioning load, as a typical constant temperature control load and household load, accounts for an increasing proportion of the load during the summer peak period, which has the potential to provide backup load. At the same time, because of its inherent heat storage performance, it can adjust the working state in a short time without affecting the utility of the user, reduce its own power demand, and then achieve the purpose of adjusting the frequency. For air conditioning load, the user's utility is mainly thermal comfort. Based on two factors, temperature and humidity, a two-layer fuzzy evaluation model of user thermal comfort is put forward, and the control strategy of individual self-responding frequency signal of air conditioning load is put forward in this paper. Adjust the temperature according to the degree of comfort and the frequency deviation of power system. Experiments are designed to verify the effectiveness of the proposed thermal comfort model and air conditioning control strategy. Although the reduction of individual air conditioning power demand has little effect on the power imbalance of the whole power grid, when a large number of air conditioning loads in the study area are adjusted to reduce the aggregate power of the load cluster, The imbalance between generation power and load power will be improved to reduce the frequency of power grid. Based on the existing third order physical model of air conditioning, Monte Carlo simulation method is used to sample the parameters of the model. The air conditioning load in the studied area is aggregated and its aggregation characteristics are mapped to the corresponding load nodes. In this paper, a dynamic model of power grid with air conditioning load is proposed. Because the aggregate power of air conditioning load group is changing dynamically and the nodal voltage and injection current are nonlinear, the aggregation characteristics of air conditioning load group can not be expressed as static ZIP model. Nor can a dynamic model for induction motors be adopted. In order to adapt to the aggregation characteristics of air conditioning, the inner layer and outer layer iterative algorithm is designed to study the dynamic process of power grid. The inner layer iteration is used to solve the network equation, and the outer layer iteration is used to solve the differential generation equations. The influence of air conditioning load control strategy on system frequency is analyzed. In the process of realization of air conditioning load control, because a large number of air conditioning load state information and data need to be transmitted and processed, so the transmission ability of information is tested. In this paper, considering the limitation of information and communication technology, the realization mechanism of interactive simulation control strategy for air conditioning load control based on Cyber physical system (CPS) is proposed. OpenDSS is used as the simulation platform of power system, and MATLAB is used as the control platform to realize the data communication and time synchronization between the two software. Based on the IEEE 13-bus distribution network model, the paper analyzes the influence and limitation of communication technology on the realization of load control through the example simulation on CPS simulation platform.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TM761.2
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