Research On The Long Term Multiple Power Coordination Method For The Provincial Power Grid Of The DC Hydropower Receive-side

In recent years,with the rapid development of China’s economy,grid load level is increasing.There is a very serious peak load regulation in the regional power grid,especially in the East China power grid which is based on thermal power.In recent years,along with the western hydropower base have been completed and put into production and the rapid construction of UHV transmission lines,the large scale hydropower electricity has been transferred to the economic load center of the eastern region,and then the eastern end of the grid by peak pressure is more and more serious.The energy development of “13th Five-Year” plan put forward a power grid construction target that to streng the peak load regulation of power system and to enhance the flexibility of the system.Hydropower is ahigh quality peak load power supply in the power grid,and how to develop the long term peak load dispatching scheme for the power supply of the power system and the power supply inside and outside the province,which has become a practical problem to be solved urgently.In this paper,the main power supply in Zhejiang power grid and the network as the research object,long-term scheduling method,peaking power grid in Zhejiang province and the Zhejiang hydro and hydropower stations with long-term cross regional interconnection of Zhejiang power grid peak scheduling method and long-term power coordination of three main aspects of scheduling method to carry out related research,has made some theoretical and practical application the value of the results are summarized as follows:(1)In order to solve the problem of long term peak regulation of hydropower station,this paper puts forward a new method based on the typical daily load of provincial power grid.This method built long-term scheduling model with typical day,proposed model solving strategy to Peak regulation preference parameter is the key factor,the power grid typical day peak demand into hydropower system long-term optimal scheduling of consideration,Zhejiang power grid hydropower scheduling example shows that the proposed method is reasonable and effective,the proposed method takes into account the power and the benefits of hydropower peaking.(2)for UHVDC hydropower sent by the long-term coordination and optimization of end hydropower station,put forward a kind of DC power grid by the end of hydropower and hydropower station group multi-objective optimization scheduling method,the method makes full use of the differences in hydrological characteristics of DC sent by the end of the hydropower station,play hydrology and power compensation across the province of DC the interconnection of hydropower,POA,DDDP,successive load shedding algorithm to solve the inter provincial interconnection of power station and DC transmission line length of large-scale hydropower complex spatio-temporal constraint.Xi-Zhejiang UHV receiving hydropower station group scheduling plan examples show that,compared with the actual operation,this method considers self-generated power generation efficiency of sending and receiving terminalsand the peak load regulation of the power grid,and has little effect on the regulation of the province,has a high practical value.(3)Aiming at the problem of long term coordinated optimization of UHV Hydropower Station,with the Zhejiang power grid and its province power stations--water,coal,gas,nuclear power station as the research object,put forward a scheduling method considering short term electric power balance and long-term power coordination,this method takes the grid power balance for the long term in order to control constraints,the balance of power as the typical day peak check index,considering the constraints of the operation of power grid and power generation characteristics,four kinds of power supply,power supply branch design scheduling method.Applicationcases show that under the premise of fair scheduling,the proposed method has played a positive role in making full use of clean energy,reducing the cost of power generationand ensuring the balance of power and electricity in short and long term.