Type of Document	Thesis
Author	Cao, Jianwu
Author's Email Address	jc09u@fsu.edu
URN	etd-04142011-125321
Title	Analysis and Implementation of Grid-connected Solar PV with Harmonic Compensation
Degree	Master of Science
Department	Electrical and Computer Engineering, Department of
Advisory Committee	Advisor Name Title Chris S. Edrington Committee Chair Linda DeBrunner Committee Member Simon Y. Foo Committee Member
Keywords	Harmonic Compensation Solar Energy High Penetration
Date of Defense	2011-04-01
Availability	unrestricted
Abstract A grid-connected photovoltaic (PV) system with the functionality of harmonic compensation is introduced in this thesis. Based on this, a test bed is built up to validate the practicability of the proposed scheme. Increasing interest and investment in renewable energy give rise to rapid development of high penetration solar energy. There are multiple ways to interface PV arrays with the power grid. The topology of a multi-string two-stage PV module with a centralized inverter is developed in the thesis, which is more suitable for medium power applications. However, the output of solar arrays varies due to change of solar irradiation and weather conditions. Therefore, the maximum power point tracking algorithm is implemented in DC/DC converter to enable PV arrays to operate at maximum power point. The incremental conductance algorithm is employed to control the boost converter. Then the central inverter is controlled by decoupled current control algorithm and interfaced with the utility grid via the distribution network. Besides, the current control of the inverter is independent of maximum power point control of the DC/DC converter. Finally, system performance and transient responses are analyzed under the disturbance conditions. And system stability is evaluated when solar irradiation change or system fault happens. The system is simulated in MATLAB. More and more use of static power converter and switched mode power supplies injects harmonic current into the power system. It’s advisable that PV can be controlled to compensate the harmonic current as well as supply the active power. The harmonic current is extracted by using time-domain current detection method, which is much easier to implement and doesn’t need any transformation comparing with the instantaneous power theory method. The system simulation is accomplished and validated by using PSCAD/EMTDC. Meanwhile, experimental test bed is also established to verify the proposed algorithm. Eventually, the total harmonic distortion (THD) of the grid current after compensation is analyzed and compared with the standard of IEEE 519-1992.
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