| With the rapid development of China’s industry in recent years,environmental problems caused by a large number of traditional energy consumption are increasingly prominent,so accelerating energy transformation has become the general trend.Because of its advantages of high efficiency and low emission,gas turbine will occupy a very important position in the energy structure of our country,so the key to the development of gas turbine lies in the general modeling of gas turbine and the off design optimization of combined cycle.The development of renewable energy has made great achievements in recent years.Renewable energy has become a major strategic measure for China’s energy transformation and to achieve the goal of coping with climate change.In order to solve the problem of renewable energy consumption,the energy market demand for energy storage is becoming more and more urgent,so the importance of economic evaluation of energy storage system is self-evident.First of all,based on thermodynamics,this paper deduced the concise mathematical correlation formula of gas turbine cycle from the perspective of flow capacity,and determined the calculation model applicable to different operation modes according to Flugel formula.Based on this model,the design parameters of V94.3a and PG9351FA units were used as the benchmark to calculate and analyze the partial load characteristic parameters under their respective operation modes,and then the key parameters were analyzed and compared with the accuracy and reliability of the model.Then taking V94.3a as the object,this paper compared and analyzed the pressure ratio,flow and other performance parameters when the unit was operated with Equal T3-T4-fuel regulation and Equal T4-fuel regulation respectively,and studied the influence of different regulation modes on the performance of gas turbine and combined cycle.Secondly,according to the step-by-step superposition method gas turbine simulation model and steam cycle flow model built by Ebsilon,the performance parameters of gas turbine combined cycle were calculated and analyzed from the changes of inlet temperature and pressure respectively,and the change laws of flow,pressure ratio,temperature ratio,power,efficiency and other parameters were studied.According to the above analysis,a new regulation mode,which is composed of compressor inlet temperature regulation,IGV regulation and inlet pressure regulation,was proposed in order to improve the efficiency of the unit under all operating conditions and achieve the purpose of deep peak regulation.Finally,this paper focused on analyzing the economic benefits of different energy storage systems from different angles.Firstly,based on the leveling model,the average generation cost of thermal power network under partial load,including coal-fired and combined cycle units,was calculated and analyzed.Then,the fuel consumption variation characteristics of power system were analyzed when storage energy participates in peak-shaving of power grid.Then,according to the three energy storage systems of pumped storage,compressed air storage and battery storage,the economic research was carried out from the resource benefit side,the social benefit side and the investment profit side.The influence of fuel consumption,installed capacity,peak-valley price difference,environmental benefit and dynamic regulation of power grid on the comprehensive economic benefit of energy storage and the economy of energy storage investment were analyzed.After comprehensive consideration of the impact of valley filling ratio,the economic benefits of peak-shaving compared with traditional peak-shaving were given from different angles to provide reference for the development of energy storage systems. |
PDF Full Text Request