Coordinated Control Strategy Research On Dynamic Demand Response Resources Participating In Grid Frequency Modulation

With the development of society and economy,the demand for electricity has been increasing in recent years,and the integration of new energy sources such as photovoltaic and wind power into the grid has also brought great challenges to the frequency stability of the grid.The traditional power system frequency modulation is mainly completed by the power generation side,but with the access of a large number of new energy sources,it is difficult to effectively deal with the supply and demand balance problems after a large number of new energy sources are connected to the grid.The power grid needs other frequency modulation methods to make up for it.The shortcomings of traditional control methods.As a demand-side resource,Dynamic Demand Response(DDR)has a variety of types and sufficient frequency modulation capacity,which can effectively alleviate the contradiction between supply and demand,accelerate the frequency stability of the power system,and reduce the frequency deviation of the system.This paper uses this as an opportunity to study the coordinated control strategy of DDR participating in power grid frequency modulation.The specific research content is as follows:First,analyze the frequency modulation characteristics of DDR resources.It introduces the uncertainty,intermittent characteristics and delay characteristics of DDR resources,describes the frequency modulation characteristics of DDR resources after they are connected to the grid under the influence of these characteristics,and then describes their different frequency modulation characteristics for different types of DDR resources,mainly Select representative electric vehicles,air conditioners and industrial loads to pave the way for the design of control strategies later.Then,the collaborative control strategy of DDR resources and power generation resources is designed.Introduced the power generation and consumption coordinated control system after adding DDR resources,and then focused on the coordinated control strategy of DDR resources based on intermittent characteristics participating in primary frequency modulation.According to the frequency control models of single-region and multi-region power systems,the parameter design methods were introduced respectively,and the specific proof and solution process are given to make the system have better stability and performance when considering intermittent characteristics.Finally,the rationality of the required parameters is verified by simulation,and the system frequency curves when no control is added and when the control is added,the system frequency curves after only using the power generation resources and the DDR resources are added,and the system frequency curves under different intermittent characteristics..It can be concluded from the frequency comparison curve that adding DDR resources can speed up system stability and improve system robustness.Finally,a collaborative control strategy for multiple types of DDR resources when participating in a frequency modulation is designed.When multiple types of DDR resources participate in power system frequency modulation due to the difference in frequency modulation characteristics,if they are not coordinated and controlled,they will have a certain impact on the grid frequency stability.In order to integrate multiple types of DDR resources,a DDR resource coordinated control strategy based on switching rules is introduced.This control strategy mainly considers the coordination of resources in the frequency modulation capacity,reduces the impact of the intermittent characteristics of DDR resources on the system frequency through collaborative control,reduces the frequency disturbance when some DDR resources are suddenly added or withdrawn,and the control strategy is verified by simulation.Sex.Next,an optimal control strategy considering economy and control performance is designed.This control strategy mainly considers that under the premise of power system stability,by solving the control gain that meets the system stability requirements,the economy of the system under various stable conditions is obtained.And control performance indicators,and use the particle swarm algorithm to obtain the final optimal control strategy,and finally verify the influence of the system frequency when the control gain is different through simulation.