Research On Coordination Control Technology Between Clean Energy And Conventional Energy In Large Power Grid

In recent years,the clean energy power technology has developed quickly in China.However,the problem of large-scale clean energy off-grid caused by grid fault or disturbance has not been properly solved,which may deteriorate the grid voltage and frequency,and even cause more serious grid accidents.To solve the above problem,this thesis combines the characteristics of clean energy and conventional energy power,and proposes the coordination control analysis process in multi-power combined operation.On this basis,coordination control measures between wind power and thermal power in actual grid are proposed from two aspects of operating conditions and protection parameters,under which the capacity loss of wind power off-grid decreases and the grid security level is improved.Firstly,the objective function and constraints are constructed to reflect the interrelation between clean energy and conventional energy power.On this basis,the coordination control analysis process in multi-power combined operation is proposed,which consists of three modules: relationship formation module,operation conditions coordination control module,and protection parameters coordination control module.This process can not only reflect the power base relationship and find the potential problems during the operation in large power grid,but also can effectively determine the reasonable coordination control measures.Secondly,the operating conditions coordination control measures are proposed.Through the simulation of Northwest Power Grid,the rising proportion of wind power in Hexi corridor will decrease the security and stability level of power grid.On this basis,the output of Jiuquan thermal power should be appropriately increased and the terminal voltage of Jiuquan thermal power should be appropriately reduced.The simulation results show that the measures can effectively alleviate the phenomenon of wind power voltage swell in Hexi Corridor,and the capacity loss of wind power off-grid has decreased significantly.Finally,the protection parameters coordination control measures are proposed.In this part,effects of wind power high voltage ride through technology on wind power off-grid are analyzed under simple and serious fault.Aiming at the problem of that high voltage wind power through technology may lead to wind power over-frequency off-grid under serious fault,the idea of thermal power turbine over speed protection coordination control is proposed.Based on the impact process between Jiuquan power turbine overspeed protection and Yu men wind power over-frequency off-grid in Northwest Power Grid,the measures to control the turbine operation duration and speed setting value of thermal power are proposed.The simulation results show that the coordination control measures of Jiuquan thermal power turbine overspeed protection can effectively avoid the Yumen wind power off-grid accidents under serious faults,and improve the safety and stability level of the power system.The coordination control analysis process of multi-power combined operation is suitable for large power grid.It can not only reflect the power base relationship and find the potential problems during the operation in large power grid,but also can effectively determine the reasonable coordination control measures.The coordination control measures can reduce the capacity loss of clean energy disorder off-grid,and improve the safety and stability level of Northwest Power Grid.