空调负荷参与微网调频的控制策略研究

Control Strategy of Air Conditioning Load Participating in Microgrid Frequency Modulation

针对新能源微源出力随机性造成微网频率波动问题,以空调负荷群为控制对象,提出了基于暖通空调类负荷的主动参与度动态调频策略。首先,分析了空调负荷在孤岛运行微网中的调频特性;然后,提出空调负荷的等效热力学参数模型、状态空间模型及简化模型,并分析了空调负荷的温度及功率变化特性。综合考虑用户意愿和分散控制下空调的触发温度,对居民参与度进行修正。考虑人体舒适度并建立空调温度和频率波动的函数关系,给出适用空调的调频策略。最后,搭建孤立微网模型并仿真,其结果证明了该策略的可行性。与无空调类负荷参与调频进行对比,该策略能够有效平抑微网频率波动。

Aiming at the problem of micro-grid frequency fluctuation caused by the randomness of the new energy micro-source output,with the air-conditioning load group as the control object,an active participation dynamic frequency modulation strategy based on HVAC load is proposed.First,the frequency modulation characteristics of the air conditioning load in the island operation microgrid are analyzed,and then the equivalent thermodynamic parameter model,state space model and simplified model of the air conditioning load are proposed,and the temperature and power variation characteristics of the air conditioning load are also analyzed.Comprehensively consider the wishes of consumers and the trigger temperature of the air conditioner under decentralized control,and modify the residents'participation.Considering human comfort and establishing a functional relationship between air conditioning temperature and frequency fluctuations,a frequency regulation strategy suitable for air conditioning is given.Finally,an isolated microgrid model is built,and the simulation results show the feasibility of the strategy.Compared with the frequency modulation without load of air conditioner,this strategy can effectively suppress the frequency fluctuation of the microgrid.