Research Of Proportioning Of A Variety Of Generate Electricity For UHVDC Transmission Engineering And Selecting Of Thermal Power Unit Capacity

In recent years, the wind power, photovoltaic industry continued to maintain strong growth momentum, the world's largest. But abandon the wind, discard the serious and not effectively solve for a long time, seriously restrict the development of the western new energy indu,stry. In jiuquan new energy base, for example, this paper studies on power spanned across the province to solve by new energy, when given the choice of electricity tran,smission channel and uhv dc engineering, the selection of supporting a variety of power ratio and thermal power unit capacity selection problem. From jiuquan in northwest and present situation of the power load forecast, and in the next few years are relying on the local electricity given the existing new energy is completely unrealistic, must rely on the long-distance transmission of electricity to the economy is relatively developed provinces and regions in order to solve. However, new energy gap sexual must match a certain amount of conventional energy to guarantee the safe and economical long-distance transmission.According to the jiuquan new energy construction and current situation of the construction of gansu power grid, analyzes the ac and dc lines on power and compares the advantages and disadvantages of long distance transmission choices, determine the jiuquan new energy should, choose out uhv dc transmission lines. Analyzes the characteristics of wind power, photovoltaic output, and fitting the formation of the wind, light power characteristics,studies the influence of form a complete set of power supply capacity of the system, and based on particle swarm optimization (pso) algorithm, the delivery capacity allocation optimization model is established, the simulation calculation shows that the greater the capacity of supporting power, the more conducive to the power grid security and stability. In the design of uhv dc transmission capacity of 8000 MW, on the basis of the choice of form a complete set of thermal power capacity of 2000 MW, 4000 MW, 6000 MW, 8000 MW in the system under different operation mode and five plan, to abandon the wind and abandoned light power,thermal power utilization hours and hours the use of dc power transmission project is analyzed and compared, and checks the capital yield of 8%. The research results: in order to ensure the minimum wind, discard, as much as possible to send out the wind power, photovoltaic and give attention to both the economy and safety of HVDC project, suggest that form a complete set of 4000 MW thermal power, 7500 MW wind power, and 2800 MW photovoltaic. On this basis, it is concluded that form a complete set of the power of wind, light, fire ratio is 2.5:1 to 1. 5. By using two kinds of schemes and three kinds of operation modes of thermal power unit capacity are compared, and technical and economic analysis of 1000 mw capacity level is most appropriate in terms of safety, economy and peak shaving.