Dynamic Reactive Power Compensation Scheme Of High Proportion New Energy Transmission System

The scale of development and utilization of new energy is gradually increasing,but new energy power plants are often built at the end of the power grid.The end of the power grid is relatively weak,and there are problems,such as transient overvoltage,that affect the overall operation stability of the power grid.For this reason,it is necessary to install additional reactive power compensation devices to maintain the voltage stability of the power system.Commonly used reactive power compensation devices in power systems include large-capacity synchronous condenser,distributed synchronous condenser,SVC and STATCOM.The compensation effects of various devices are different,and the application scenarios are also different.So far,the reactive power compensation device that is most suitable for high proportion new energy transmission system has not been obtained.In order to obtain the best reactive power compensation scheme for a high proportion new energy transmission system,this paper firstly studies the reactive power compensation effects of different reactive power compensation devices,and concludes that the compensation effect of the distributed synchronous condenser is the best.Then,based on the location method of traditional reactive power compensation devices,a comprehensive voltage index location method suitable for high proportion new energy transmission system is proposed.Finally,the excitation parameters of the distributed synchronous condenser are optimized.The main results are as follows:(1)Based on the statistical analysis of the actual new energy grid operation data,a simulation model of the high proportion new energy transmission system including reactive power compensation devices such as the synchronous condenser,SVC,and STATCOM is established.Based on the built model,the overvoltage suppression capability and low voltage support capability of different reactive power compensation devices in high proportion new energy grids are compared.Obtained the most suitable reactive power compensation device for high proportion new energy grids.(2)Through simulation comparison,after determining that the best reactive power compensation device is distributed synchronous condenser,based on the traditional reactive power compensation device location scheme,a comprehensive voltage index location method is proposed.Through comparison,the advantages of the comprehensive voltage index location method are analyzed,and a distributed synchronous condenser location scheme suitable for high proportion new energy grid is determined.(3)Comparing the excitation control schemes of different distributed synchronous condenser,it is determined that the additional control method of the high-voltage busbar voltage is the best scheme.Based on the sensitivity analysis method,the frequency domain trajectory of the excitation control link of the distributed synchronous condenser is analyzed,and the parameter optimization direction of the excitation control link of the distributed synchronous condenser is obtained.