Multi-Source Joint Scheduling Of Concentrating Solar Power Plant And Wind Power System Considering Controllable Load

With the increasing scale of wind power grid connection,its fluctuation and anti-peak regulation characteristics will aggravate the peak-valley difference of the system,affect the safe and stable operation of the power system,and accompany with serious wind curtailing phenomenon.Especially in the "northwest" region,which is rich in renewable energy such as wind and light,the "multi-source complementarity" of wind power and other renewable energy has become the main feature of the development of new energy.In order to effectively solve the problem of wind power consumption and system peak regulation in northwest China,this paper is based on the joint dispatching of concentrating solar power plant with thermal energy storage and wind power system,starting from the power supply and load on both sides at the same time,the power supply side when the use of the energy of the thermal energy storage characteristics to improve the flexibility of system scheduling,in the lateral load is introduced into electric heating device to make full use of the thermal energy storage of the concentrating solar power plant,at the same time introducing electrochemical energy storage device of hybrid energy storage to coordinate with the thermal energy storage running,the electric heating device and electrochemical energy storage device as a controllable load,participate in wind power consumption.This paper focuses on the following two key points:(1)The electric heating device is introduced into the concentrating solar power plant.The concentrating solar power plant and the electric heating device share a thermal energy storage,it is necessary to consider the influence of the optimal configuration of the capacity of thermal energy storage and the maximum power of the electric heating device on the system operation.(2)The electric heating device with the label of "high energy and low yield" is combined with the concentrating solar power plant with thermal energy storage.Although the wind abandon is absorbed,part of the energy is lost in another way.The conversion efficiency meets the balance of power,but the energy loss cannot be ignored,and the impact of this part of the loss on the system operation needs to be considered.Based on the analysis of the operating mechanism of each module of the combined system,the scheduling model of the multi-source combined system is firstly established.In order to consider the influence of energy loss in the process of using electric heating device on the system operation,the penalty cost of abandoning power generated in the process of using electric heating device is added into the model.Second,the annual measured data of a wind farm and the concentrating solar power plant in northwest China are selected as the research object,through the scene generation and strategy of shrinking scenario,selected to represent the year direct normal irradiance of concentrating solar power plant and the wind power system output three kinds of typical scenarios,In order to minimize the comprehensive operating cost of the multi-source combined dispatching system,the optimal thermal energy storage capacity and the maximum power of the electric heating device were selected,and the importance of the optimal configuration of the thermal energy storage capacity and the maximum power of the electric heating device was verified.Then to four existing scheduling model for comparison,through the system of integrated operation cost,wind power given,the effect of "cutting wind valley" and the efficiency of thermal power unit is analyzed in many aspects,although is verified in the use of electric heating device in the process of energy loss is bigger,but its investment cost is low,and the ability to make full use of the thermal energy storage of concentrating solar power plant to effectively reduce air flow,suitable for the large scale wind power in the "northwest" area;Finally,the simulation results show that the multi-source joint scheduling model established in this paper can effectively improve the wind power consumption,reduce the comprehensive operation cost of the system,improve the load curve,and have better environmental and economic benefits under the condition of ensuring the safe operation of the system.