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Volume 29 Issue 5
Oct.  2016
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Journal of Southwest Jiaotong University  > 2016  >  29(5): 894-901.
LI Qi, YANG Hanqing, HAN Ying, CHEN Weirong. Method of Parameter Coordination Optimization for Grid-Connected Photovoltaic System[J]. Journal of Southwest Jiaotong University, 2016, 29(5): 894-901. doi: 10.3969/j.issn.0258-2724.2016.05.011
Citation: LI Qi, YANG Hanqing, HAN Ying, CHEN Weirong. Method of Parameter Coordination Optimization for Grid-Connected Photovoltaic System[J]. Journal of Southwest Jiaotong University, 2016, 29(5): 894-901. doi: 10.3969/j.issn.0258-2724.2016.05.011
shu

Method of Parameter Coordination Optimization for Grid-Connected Photovoltaic System

doi: 10.3969/j.issn.0258-2724.2016.05.011
  • Received Date: 22 Jul 2015
  • Publish Date: 25 Oct 2016
    Abstract
  • The parameter design of grid-connected photovoltaic (PV) system is significant for its stable operation. In this work, a method of parameter coordination optimization was proposed for grid-connected PV system, by establishing the small-signal mathematical model of PV system, including PV cell, inverter, transformer and gird. By analyzing eigenvalues (root locus plot) in stable conditions, the boundary values of system parameters are available. Then the objective function for coordination optimization was built involving small-signal stability, damping ratio and stability margin. And the backtracking search algorithm (BSA) was adopted to optimize the system parameters. The simulation test is carried out to compare the dynamic system responses before and after parameter optimization. Simulation test results show that when system suffers small disturbances, the optimized grid-connected PV system can reach a new stable point within 0.1 s, and its dynamic response is improved 50% than that of the original system.

     

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