Research Article
An Optimal Control Strategy for DC Bus Voltage Regulation in Photovoltaic System with Battery Energy Storage
Table 4
Initial and optimised PI controller gains for the power converters based on simplex optimum run.
| | Power converter | Compensator | Hand tuning |
aOptimized | | | | |
| G-VSC
(voltage mode) | PI1 | 1 | 0.005 | 1.015 | 0.0008713 | | PI2 | 0.2 | 1 | 0.2 | 1 |
| G-VSC
(current mode) | PI3 | 2 | 0.001 | 1.957 | 0.0002511 | | PI4 | 0.6 | 0.005 | 0.6 | 0.005 | | PI5 | 0.1 | 20 | 0.1 | 20 | | PI6 | 5 | 0.05 | 5 | 0.05 |
| DC/DC
buck-boost
(BES) | PI7
(voltage-mode) | 1.2 | 0.2 | 1.147 | 0.2438 | PI7
(current-mode) | 1.2 | 0.2 | 1.212 | 0.2026 | | PI8 | 1 | 0.5 | 1 | 0.5 |
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Minimize WISE performance index with = 0.07, = 0.008, total number of runs = 200.
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