| Transmission line to add string is an important means to improve its transmission capacity,which can significantly improve the system voltage and reduce the system network loss.However,if the String complements and position of the series compensation is improper,it will lead to the increase of the operating cost of the system and the voltage stability is not ideal.In order to reduce the network loss and improve the voltage quality of the power system,the configuration of the series compensation is studied,and the influence of the series compensation on the voltage stability is analyzed in this scheme.The system voltage is optimized in the case of the load of system changes.Firstly,the influence of the series compensation on the system is analyzed from three aspects:the line transmission capacity,the voltage quality and the network loss.Then,the problem of optimizing the power flow in the complex system is studied.The power flow of the system is calculated by combining the Newton Raphson algorithm and the PQ decomposition method.Based on the calculation of the power flow,a multi-objective optimization model with network loss and voltage quality is established.The improved particle swarm optimization algorithm based on random weight is used to optimize the optimization model of the configuration of the series compensation.The machine-network optimization model of active power output changed and the simple network optimization model of active power output unchanged are compared.Secondly,by comparing the static voltage stability of the system,the static voltage analysis method of PU curve is used to compare the network with the series compensation configuration.Finally,machine-network-load optimization is carried out with the minimum voltage deviation and the system load variation in the case that the system series compensation is determined.The power flow calculation and optimization is based on the MATLAB platform programming.The integrated power flow calculation method is validated in the IEEE5-bus power transmission system,and the results show the effectiveness of the integrated power flow calculation method.The optimization simulation is carried out on the IEEE14 node transmission system and the IEEE30 node transmission system.The results show that the reasonable allocation of series compensation can effectively improve the system network loss and voltage quality.The IEEE 14 node transmission system to consider the series stability of the voltage stability and IEEE30 node transmission system to consider the series stability of the voltage stability are compared on based on the PSD-BPA platform programming.The research results of this paper provide an effective and practical research method for the power system planning considering the series compensation configuration. |
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