Multi-region Frequency Control Considering Spatial Difference Of Frequency Management Resources

The penetration rate of renewable energy in the power system has been increasing in recent years.While producing plenty of clean electricity,it also introduces the volatility and uncertainty of renewable energy into the power system which requests higher requirements for the stability of power system.Diversification of the power supply structure on the power supply side brings frequency stability issues and the participating of various types of controllable loads on the power consume side brings more possibilities for load frequency control.Excavating the control and economic performance of coordinated generation-load frequency adjustment and studys on single-region and multi-region network frequency coordinated control are of great significance to efficiently absorb renewable energy power and ensure the safety and stability of power system.This thesis focuses on the secondary frequency control of power systems.And it carries out the research on multiple types of frequency regulation resources,renewable energy generation consumption and cross-regional electrical energy transmission.The main work and research results are as follows.(1)An evaluation method of power system frequency regulation resource value.Considering that recently the power consume side of the power system has been increasingly rich in types and numbers of controllable loads and the development of controllable loads participating in frequency control,unified scheduling of frequency regulation resources on the power consume side and power supply side is essential.We use the local marginal price as an indicator to measure the value of frequency regulation resources,which emphasizes the value of frequency regulation resources in the spatial position of the power grid.Through two-stage Bayesian game between the grid dispatching center and multi-type frequency regulation resources,we select the frequency regulation resources and their prices that participating in the frequency regulation without full disclosure of information to improve the economic performance of power system.We take IEEE 39 node system as an example.Simulation results show that the method proposed in this chapter can effectively select the more economical frequency regulation resources to participate in frequency modulation(2)A single-region pwer grid frequency control method which considering the differences in frequency regulation resources.In order to deal with the randomness and uncertainty caused by the large amount of distributed renewable energy generation connected to the grid,chance-constrained models are used to describe the fluctuation of renewable energy generation.And introduce two different types of controllable loads to participate in frequency regulation based on the content of last chapter.We highlight the differences between controllable loads in frequency control response mode and economic compensation mode.The controllable loads participate in frequency control together with the reserve capacity of the power plant on the power supply side during the frequency regulation process.In order to improve frequency stability and operation economy,a frequency control model is established which accounts for differences in frequency regulation resources in a single-region power grid to improve system frequency control performance and dispatch economy.Simulations are carried out in IEEE 39 node and 118 node system respectively.We verify the effectiveness of the method proposed in this chapter comparing with the existing frequency control method.(3)A frequency control method for multi-region interconnected power system based on fairness principle.Considering the construction and operation of large renewable energy power generation bases in the end of the power grid and the development of cross-regional power transmission in the interconnected power grid in recent years,the similarities and differences between different regional power grids are analyzed and are distinguished into the regional power grid of renewable energy power generation end and receiving end.The proportion of renewable energy generation in the regional power grid,the load level and the characteristics of the tie lines between the regional power grids are proposed to be main influencing factors.Based on consensus algorithm of multi-agent system and indicator foe the fairness of the distribution of frequency managment responsibilities among regional power grids,the frequency control model of the multi-region interconnected power grid considering fairness is established.In the three-region interconnected grid model,simulations are carried out in different situation which verifies the effectiveness of the method proposed in this chapter.Furthermore,taking the limitations of the actual power system into account,simulations with restricted conditions are performed to verify the effects of the restricted conditions on the method proposed in this chapter.