Research On Frequency Regulation Control Strategy Of Power System Based On Electric Water Heater Load

The frequency of power system is one of the important indicators to reflect the power quality of the system.However,in recent years,the grid-connection of a large number of new energy generation has caused a certain impact on the stability of the frequency of power system,and it is difficult to achieve satisfactory frequency modulation effect by simply relying on the frequency modulation device at the generator side.With intelligent control technology,the continuous development of high and new technology such as advanced communication technology,all walks of life,into the era of information,intelligent power grid is not exceptional also,along with the implementation of "smart grid" concept has brought about,using load demand response to the demand side of FM become more easy to implement,for power system frequency control problem has opened up a new path.In this dissertation,the typical electric water heater load in the demand response load is taken as the research object,and the principle,frequency modulation potential,aggregation model and core control strategy of its participation in the demand side frequency modulation are analyzed and studied in detail.Firstly,the frequency modulation mechanism of power system is studied,especially the related principle of demand-side frequency modulation is expounded.Then,the feasibility and great potential of electric water heater load participating in frequency modulation of power system as a demand response load are proved.By studying the working characteristics of electric water heater load and the physical model of individual,the aggregation model of electric water heater load is constructed by using the state sequence method,and the relevant capacity information of the aggregation group of electric water heater is obtained.It provides the theory and model basis for the electric water heater load to participate in the frequency modulation of power system.Then,based on the theory and model presented above,a fuzzy adaptive control strategy of electric water heater load participating in frequency modulation of power system is proposed.In this strategy,the load of the electric water heater is taken as the control object,and according to the aggregation model of the electric water heater,the aggregation group participates in the adaptive adjustment of the frequency response of the system through temperature regulation control method.At the same time,in order to make the regulation control more flexible,a fuzzy controller is constructed,and the frequency modulation response coefficient is adjusted by using fuzzy rules to achieve different frequency modulation effects in different situations.Finally,an example is given to verify the effectiveness of the proposed control strategy.Finally,considering the abundance problem of the aggregation group composed by the electric water heater load,an improved grouping control strategy is proposed to participate in frequency modulation while maintaining the abundance of the aggregation group of electric water heater.In this strategy,the aggregator mechanism is introduced,and the aggregator is used to control the load group of the electric water heater.Firstly,the load group is realized by analyzing the actual situation of the system and the operating state information of the electric water heater aggregator group.Then,the elastic threshold method based on fuzzy control is used to control the frequency regulation of the response system of each load group.After the response,a delay recovery and reset mechanism was used to restore the state of the cluster,which realized that the richness of the cluster was not disturbed while responding to the system frequency regulation.Finally,an example is given to demonstrate the effectiveness and superiority of the improved group control strategy.