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Lizhen Wu,Xusheng Yang,Hu Zhou,Xiaohong Hao 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.4
Suitable location and optimal sizing are impact on voltage stability margin of the distributed system. It is important to accurately simulate the random output active power of Distributed Generation (DG). In order to model uncertainties of intermittent distributed generation and load, this paper proposes a multi-scenario tree model of wind-photovoltaic-load using multiple scenarios technique based on the Wasserstein distance metrics, which generates asymptotically optimal scenario. And in this paper, a multi-objective optimizes control model with scenario tree is presented, which including objectives that are the total active power losses and the voltage deviations of the bus. Moreover, a new hybrid Honey Bee Mating Optimization and Particle Swarm Optimization (HBMO-PSO) algorithm is proposed to solved the problems. In the HBMO-PSO algorithm, the mating process is corrected, which the PSO algorithm is combined with the HBMO algorithm to improve the performance of HBMO. Finally, a typical IEEE 33-bus distribution test system is used to investigate the feasibility and effectiveness of the proposed method. Simulation results illustrate the correctness and adaptability of the proposed model and the improved algorithm.
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Cai Jin,Wu Xusheng,Sun Pan,Sun Jun,Xiong Qiao 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
To obtain high effi ciency and reduced EMI in the inductive power transfer (IPT) system, it is crucial to understand the zerovoltage-switching (ZVS) control of the inverter. The frequency tracking method is usually adopted to achieve ZVS operation. However, the eff ect of frequency bifurcation in the series-inductor-capacitor-capacitor (S-LCC) system results in frequency tracking failure. To solve this problem, this paper proposes a parameter optimization design for the S-LCC system to achieve ZVS operation under the dynamic coupling coeffi cient. The analytical solution of the bifurcation frequency of the S-LCC system and the boundary conditions of the frequency bifurcation are derived through the fundamental harmonic model. Based on this boundary condition, a parameter design strategy with no frequency bifurcation under the dynamic coupling coeffi cient is established. The maximum critical coupling coeffi cient of the system is obtained by numerical analysis. Then, a frequency tracking strategy based on a phase-locked loop is given to realize ZVS control. Within the critical coupling coeffi cient, frequency bifurcation does not occur in the S-LCC topology. Finally, a 2 kW test prototype is built up to verify the feasibility of the theory.
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