Integration of Renewable Energy Micro-grid with Control Area Network Communication

• Main Authors: Chen-gang Zeng, 曾晨綱
• Other Authors: Jonq-chin Hwang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/45761186634083338501

碩士 === 國立臺灣科技大學 === 電機工程系 === 101 === This thesis presents the design and development of a renewable energy supply system which is integrated with the power grid. The two-leg interleave pulse-width modulation method has been used in the solar and wind energy supply system to reduce the ripple current. The perturbation and observation maximum power tracking control has been adopted. This methodology is realized by using current control. In three-phase grid-connected power system, the inverter adopts a dc voltage closed-loop control which stabilizes the dc voltage. While the output power of renewable energy supply system exceeds required power consumption for dc/ac load, the surplus energy is supplied to the grid-connected power system. The behavior described above is defined as selling electricity. On the other hand, when the energy produced by the renewable energy system is insufficient for the dc load, energy is supplied from the grid-connected power system, and is defined as buying electricity accordingly. This thesis uses a 32-bits digital signal processor (DSP, TMS320F28335) as the control core. The voltage and current feedback control strategy for each module have been accomplished by programming with C language. In this thesis, a renewable energy power converter and the control area network communication controlled by graphic system control software, Labview, which is integrated with the three-phase (220V/60Hz) grid-connected power system is implemented. Therefore, the feasibility of the proposed control strategy is validated accordingly. When the grid-connected power system is selling 2kW electricity, a solar and wind energy system efficiency can reach 94% and 93%, respectively, the corresponding inverter efficiencies is 95%, with a total harmonic distortion of 4.98% and the power factor of 0.95. Besides, when the grid-connected power system is buying 3kW electricity, a solar and wind energy system efficiencies reach 92% and 91%, respectively. The inverter efficiency is 93%, and the corresponding total harmonic distortion is 4.33% with a power factor of 0.98.