Dynamic Characteristic Analysis And Parameter Optimization Of New Generation Distributed Synchronous Condenser

The shortage of fossil energy and environmental degradation problems are becoming increasingly prominent,and countries are gradually strengthening the use of new energy sources such as wind and solar development.However,the energy distribution is uneven in China,and new energy sources are mostly located in remote areas,which makes it difficult to resist the impact of the system when sending energy across regions and is prone to chain off-grid accidents,therefore sufficient reactive power reserve capacity needs to be installed in new energy field stations.To improve the operational reliability of the new energy system,this paper uses a new generation of the distributed synchronous condenser as a reactive power compensation device to study the influence of electromagnetic parameters,excitation parameters,and excitation structure on the dynamic characteristics of the condenser.Firstly,the working principle of the distributed synchronous condenser and excitation system is analyzed,the mathematical model of the regulator is established,and the evaluation index that responds to the dynamic reactive power characteristics of the regulator-the effective reactive current gain-is determined.Based on the frequency domain sensitivity analysis of the index,the key parameters and optimization laws affecting the dynamic characteristics of the condenser are obtained.Further,through the frequency response and time domain simulation of a wind power system,the correctness of the theoretical analysis is verified,and the theoretical basis is laid for the optimization of the excitation system parameters.Secondly,the effective reactive current gain is used as the objective function and the average frequency domain sensitivity is used to guide the direction of population search.The bee colony algorithm is improved in terms of both population search mode and selection strategy,and then the optimization model of excitation parameters is solved.The correctness and effectiveness of the improved bee algorithm are verified by two aspects: frequency response of the effective reactive current gain,and simulation of the wind power system in the time domain.Afterward,the operating characteristics of the stator voltage and current dq-axis components of the dual-excitation condenser are analyzed,a mathematical model of the dual-excitation condenser is established,and the factors affecting the reactive power characteristics of the dual-excitation condenser are determined.The parameters of the body and excitation system of the dual-excitation condenser are optimized by combining the relevant analysis methods of the single-excitation condenser described in the previous section,and the time-domain simulation is verified in the wind power system.Finally,based on the mathematical models of single-excitation and dualexcitation condenser,the main parameters affecting the phase depth of the condenser are determined and verified by time-domain simulation in the wind power system.Meanwhile,the impact of excitation structure on the dynamic reactive power characteristics of the condenser is analyzed in-depth for the case of sudden voltage changes using simulation experiments.