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Content Provider | IET Digital Library |
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Author | Jia, Qi Yan, Gangui Cai, Yuru Li, Yonglin |
Abstract | In this study, a small signal model of paralleled inverters for multiple photovoltaic (PV) generation units (MPGUs) connected to weak grid is developed. Based on the proposed small signal model, eigenvalue analysis is employed to study the stability of MPGUs within different grid strength, different control parameters in each phase-locked loop (PLL) controller and varying operating points in each PV generation unit. Furthermore, based on the transfer function of the power control loops in dq rotation frame, the coupling mechanism of operating point in each PV unit is revealed. The results show that: with the increasing of output power of PV unit among the PV generation and the decreasing of the grid strength, it may occur oscillation phenomena, the oscillation frequency is about 5 Hz; tuning gains of PLL has noticeable effect on the damping characteristic of the system, and larger PLL gains can improve system damping; each PV unit power control loop is coupled by the point of common coupling voltage, increasing the output power of PV unit, it may reduce the phase margin of the system transfer function and deteriorate the system stability. Theoretical analysis is verified with simulation of MPGUs connected to weak grid. |
Starting Page | 2015 |
Ending Page | 2020 |
Page Count | 6 |
Volume Number | 2017 |
e-ISSN | 20513305 |
Issue Number | Issue 13, Jan (2017) |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/joe/2017/13 |
Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/joe.2017.0683 |
Journal | The Journal of Engineering |
Publisher | The Institution of Engineering and Technology |
Publisher Date | 2017-01-01 |
Access Restriction | Open |
Rights License | Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) |
Subject Keyword | Control of Electric Power System Control Parameter Damping Damping Characteristic Distributed Power Generation Eigen Values And Eigen Function Eigenvalue Analysis Grid Strength Invertors MPGU Multiple Photovoltaic Generation Units Operating Point Output Power Paralleled Inverter Phase Locked Loop Phase Margin Phase-locked Loop Controller Photovoltaic Power System PLL Controller Power Control Power Control Loops Power Generation Control Power Grid Power System Control Power System Stability PV Generation Unit PV Unit Power Control Loop Small-signal Stability Analysis Solar Power Stations Stability in Control Theory System Stability Transfer Function Varying Operating Point Weak Grid |
Content Type | Text |
Resource Type | Article |
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