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https://ptsldigital.ukm.my/jspui/handle/123456789/486989Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Azah Mohamed, Prof. Dr. | - |
| dc.contributor.author | Muhammad Zalani Daud (P58248) | - |
| dc.date.accessioned | 2023-10-11T02:27:16Z | - |
| dc.date.available | 2023-10-11T02:27:16Z | - |
| dc.date.issued | 2014-11-04 | - |
| dc.identifier.other | ukmvital:120352 | - |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/486989 | - |
| dc.description | High penetration photovoltaic (PV) power in a power system can lead to voltage instability problems due to intermittencies related to cloud cover. The fluctuated PV power injected directly to the utility grid on a large scale may cause violation of grid system such as unnecessary voltage rise, voltage and frequency deviations at the point of common connection. Earlier studies have indicated that energy storage can compensate for the intermittent nature of PV power and provide mitigation strategy to enhance DC bus voltage regulation. In this thesis, control strategies for a hybrid PV with battery energy storage (BES) system have been proposed to mitigate the intermittent impacts of grid-connected PV systems. To enhance DC bus voltage regulation, BES is interfaced via a buck-boost converter in addition to conventional regulation solely based on voltage-sourced converter (VSC). The control of PV/BES grid-side VSC is initially developed based on conventional voltage-mode and currentmode control schemes. In addition, an optimal control strategy using simplex optimisation method is proposed to provide robust VSC and buck-boost converter control designs. To mitigate PV power fluctuations, BES charge/discharge control is implemented to smooth out the PV output and dispatch the net power on an hourly basis to the utility grid. During power dispatch operation, BES state-of-charge (SOC) is regulated using the SOC-feedback (SOC-FB) control scheme. For continuous charge/discharge over hours of operation, a more accurate BES model is developed to account for effects of variations in terminal voltage, self-discharge resistance and cell impedances. Using the improved BES model, an optimal SOC-FB control scheme is also developed using heuristic optimisation techniques such as genetic algorithm, gravitational search algorithm and particle swarm optimisation. Finally, to maximise the benefits of BES installation, a coordinated control strategy of PV/BES system is developed to enable the system to operate flexibly in normal, power fluctuation and emergency modes of operation. Simulations were carried out using the PSCAD/EMTDC and Matlab/Simulink software and the results show acceptable performances of the developed optimised control strategies. The proposed simplex optimised current-mode control scheme can quickly restore the bus voltage to 1 p.u. (1.82%-2.96% spikes) compared to the conventional non-optimised current-mode (4.2%-8.2% spikes) and voltage-mode (6.6%-18% spikes) control schemes, respectively. The results for PV/BES output power dispatch show significant performance using the optimal SOC-FB control scheme with high efficiency of 90% compared to the methods from previous works. Furthermore, multi-parameter optimisation provides optimal BES sizes which are reduced to within the range of 0.8%-6.9% compared to the initially estimated size. The payback calculation on BES investment shows 170% returns of investment over the 10 years contract. The developed coordinated control strategy for PV/BES also gives satisfactory performance in the studied cases. Thus, the developed enhanced control strategies for PV/BES systems are useful for mitigating the impacts of PV generation intermittency and can be implemented to a new or already installed PV system.,Certification of Master's / Doctoral Thesis" is not available | - |
| dc.language.iso | eng | - |
| dc.publisher | UKM, Bangi | - |
| dc.relation | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | - |
| dc.rights | UKM | - |
| dc.subject | Photovoltaic power generation | - |
| dc.subject | Photovoltaic power systems | - |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | - |
| dc.subject | Dissertations, Academic -- Malaysia | - |
| dc.title | Control strategies for battery energy storage systems for mitigating intermittent photovoltaic generation | - |
| dc.type | Theses | - |
| dc.format.pages | 147 | - |
| dc.identifier.callno | TK1087.M8495 2014 3 tesis | - |
| dc.identifier.barcode | 005313(202)(PL2) | - |
| Appears in Collections: | Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina | |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_120352+SOURCE1+SOURCE1.0.PDF Restricted Access | 697.88 kB | Adobe PDF |  View/Open |
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