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Parameters optimization design for LCL-type STATCOMs under complex power grid
Wang, Xiangyu,Wang, Minglei,Wang, Liguo,Fu, Guangjie,Qiao, Jinxin The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.2
LCL filter parameters and control parameters are interdependent and inter-restricted. They can all affect the stability of a static synchronous compensator (STATCOM) under the effects of a complex power grid such as harmonic grid voltage and grid impedance variation. An advanced parameters optimization method integrated with LCL filter and control strategy is proposed. At first, the ABC-Pareto algorithm (Pareto multi-objective optimization of an artificial bee colony algorithm) is used to reasonably choose the LCL filter parameters. Under the premise of using capacitor current feedback active damping control and grid voltage feedforward control, the mathematical models of the STATCOM are derived. The constraints of control performances on the control parameters are obtained. According to these constraints, it is possible to construct a satisfactory 3D space. The control parameters can be chosen reasonably by finding the optimized space when the power grid is changed. Simulation and experimental results show the effectiveness and superiority of the proposed method.
Shaojun Bai,Chunlong Li,Xiangyu Fu,Jian Liu,Shuming Wen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-
The interaction between sulfide-ion species and smithsonite surfaces in the absence with and without ammonia liquor was investigated. The results of zeta potential and sulfide ion adsorption indicated that NH3·H2O addition promoted the transfer of sulfur in the pulp solutions onto the smithsonite surfaces. Time-of-flight secondary ion mass spectrometry and X-ray photo-electron spectroscopy analysis indicated that the zinc sulfide species was composed of zinc monosulfide and zinc polysulfide and was reinforced by NH3·H2O addition. The distribution ratio of polysulfide in the whole S species increased. The results shed light on reinforcement of the smithsonite sulfidation mechanism with ammonia liquor addition.