基于強化學習的蓄電池儲能系統(tǒng)的優(yōu)化控制
[Abstract]:The distributed generation units, such as wind energy and solar energy, are affected by climate and weather, so it is difficult to ensure stable power generation, which may cause frequency and voltage instability, and then cause power outages. In order to solve this problem, energy storage device is introduced into the system with distributed power supply. However, under the influence of the environment, there will be imbalance between the power supply and the power load of the system, which will lead to the battery in the state of power deficit or overcharge, and the long-term operation will reduce the service life of the battery group and increase the maintenance cost of the system. Therefore, the selection of appropriate battery control strategy has important practical significance. In this paper, a battery energy storage system composed of distributed power generation, energy storage equipment, power load and energy management center of the system is studied. The energy storage system can interact with the power grid. Electricity can be bought from the power grid when the power generation is insufficient. In addition to supplying the load demand, the excess power in the system can be sold to the power grid or to provide frequency regulation services to the power network. The distributed generation power, load demand power, electricity price and frequency modulation price are independent of each other. In this paper, they are modeled as Markov chains. The time of stay of storage battery energy storage device from current state to empty state and full state is not satisfied with exponential distribution, so the optimal control problem of the energy storage system is modeled as a semi-Markov decision-making process. In this paper, the model-based Sarsa algorithm is used to learn the optimal strategy, so that the long-term benefits of the system can be maximized on the basis of satisfying the load requirements. With the development of electric vehicle industry, vehicle-to-grid, V 2 G is becoming a research hotspot. In this paper, we consider introducing distributed generation equipment into V2G system. Electric vehicles can buy electricity from the power grid when the generation capacity is low; when the generation capacity is relatively strong, in addition to the electricity demand for electric vehicles, the excess power generation is sold directly to the power grid. Electric vehicles idle on charging piles can interact with the power grid and decide to sell power to the grid or provide frequency regulation services according to their own electricity quantity and the price of electricity price and frequency modulation. It is assumed that the system can obtain the power generation and price information of the system at the beginning of the decision cycle. The optimal control problem of the system is modeled as a dynamic programming process. The method of policy iteration is used to obtain the optimal policy, so that the system can obtain the maximum profit while satisfying its own requirements.
【學位授予單位】:合肥工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM912
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