Distributed Harmonic Governance And Stability Analysis Of The Voltage Detection APF

Along with the harmonic sources of power electronic distribution networks present a trend of high-density and decentralized,the traditional point-to-point governance model on the user-side is no longer applicable.The voltage detection APF has the characteristics of high efficiency and economy as the power grid side harmonic governance equipment under the new situation,its global governance capability can effectively solve the problem of dispersed harmonic pollution.But the voltage detection APF is distributed in the system that measures the voltage of the access point and actively regulates the voltage.Which impacts the stability through the linkage of node voltages.Therefore,studying with the stability improvement strategy of the voltage detection APF is of great significance to ensure its reliable operation.In order to accurately study the coupling relationship and operating stability of voltage detection APF,firstly the governance principle of voltage detection APF is analyzed.The harmonic governance capability of the voltage detection APF is verified.The scheme of network-wide cooperately optimized and distributed harmonic management for power electronic distribution networks based on voltage detection APF is proposed.Then an analysis method of harmonic voltage aggregation effect of distribution system based on the principle of harmonic superposition is introduced.And combining with the operating characteristics of voltage detection APF,the influencing factors of the operating stability that belongs to the voltage detection APF are analyzed.That provides theoretical basis for modeling and analyzing the influence of control parameters on the stability of voltage detection APF.The linearized state space model of the APF distributed harmonic control system with voltage detection is established.Combining with the analysis of the eigenvalue sensitivity,the dominant control parameters which affect the eigenvalue of the system are determined.The root locus of the system principal eigenvalue root locus with the changeing of the dominant control parameters and the value range of the dominant control parameter of the system stability are obtained.Then,the strategy for improving the dominant control parameter is determined.An optimization model with the dominant control parameter as the optimization variable is established and the objective is to minimize the principal eigenvalue real part that belongs to the system.The adaptive weight particle swarm optimization(AWPSO)algorithm is used to solve the problem.Based on the established constraint conditions of the dominant control parameters of the voltage detection APF and fitness,and obtains the optimal value scheme of the dominant control parameters by parameter optimization through the AWPSO algorithm.The voltage detection APF distributed harmonic control system MATLAB simulation model of the corresponding system parameters is built.The stability simulation analysis of the distributed harmonic control system is performed for the stability parameters obtained from the optimization and the instability parameters obtained from the eigenvalue analysis.The dynamic response process of the voltage detection APF after being disturbed is observed,and the operation stability of the equipment under different dominant control parameters is verified.The governance effect of the voltage detection APF distributed harmonic control system is obtained and the influence of different dominant control parameters on the governance effect is analyzed.The simulation results verify the accuracy of the stability analysis and the effectiveness of the strategy for improving the dominant control parameters.