The dual-mode photovoltaic inverter is capable of operating either in grid-connected mode or island mode, acting as a current source for the ac grid in the former and a voltage source for the load in the latter. Trans...
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ISBN:
(纸本)9781467371520
The dual-mode photovoltaic inverter is capable of operating either in grid-connected mode or island mode, acting as a current source for the ac grid in the former and a voltage source for the load in the latter. Transitioning from one mode to the next is non-trivial and can cause large deviations in voltage, current, and frequency because a mismatch in frequency, phase, and amplitude between the inverter output voltage and the grid voltage. This paper presents a model predictive control (MPC) for a single phase, grid-connected voltage source inverter (VSI) to support dual-mode operation and seamless transfer between the two. This technique uses decoupled power control in grid-connected mode and voltage control in island mode respectively. Seamless transfer is implemented through synchronization algorithm and smoothly changing weighting factor for the cost function of the MPC. Compared with PI based controller, the MPC controller is simpler to implement since there is only one parameter to tune, the weighting factor. Combined with second order generalized integrator (SOGI), the synchronization algorithm is used to achieve fast phase detection and improved disturbance rejection. The theoretical analysis, simulation and experimental results validate the effectiveness of the proposed control strategy.
The real-time network has always been a hot issue in different kinds of fields. This paper introduced a late-model real-time network, Time-Triggered Ethernet(TTE) with incredible performance of determinacy and reliabi...
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The real-time network has always been a hot issue in different kinds of fields. This paper introduced a late-model real-time network, Time-Triggered Ethernet(TTE) with incredible performance of determinacy and reliability. A simulation model of TTE system based on OMNet++ is presented in the paper for validation. Moreover, the paper builds a TTEthernet system based on EDA technology with simplified nodes in which the main synchronization algorithm and some other functions are realized.
The variation of packet-arrival intervals is one of the problems to be solved in realizing real-time voice communications on asynchronous networks such as the Internet. Although the variation can be absorbed by a rece...
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In this paper, we gave a brief discussion of the expanded time and frequency OFDM (ETF-OFDM) system and its traditional synchronization method (the Schmidl's method). And then we present a rapid frame and symbol s...
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ISBN:
(纸本)9781629931357
In this paper, we gave a brief discussion of the expanded time and frequency OFDM (ETF-OFDM) system and its traditional synchronization method (the Schmidl's method). And then we present a rapid frame and symbol synchronization algorithm in this system for just detecting one training symbol instead of two training symbols in Schmidl's method. The algorithm has low calculation complexity and outperforms conventional synchronization methods.
In this paper to improve the capacity and coverage of the channel in WCDMA with OFDM, a concatenation of Wideband Code Division Multiple access (WCDMA) and Orthogonal Frequency Division Multiple Access (OFDM) is used ...
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ISBN:
(纸本)9781457715808;9781457715839
In this paper to improve the capacity and coverage of the channel in WCDMA with OFDM, a concatenation of Wideband Code Division Multiple access (WCDMA) and Orthogonal Frequency Division Multiple Access (OFDM) is used as spreading code. synchronization error which degrades the OFDM system performance is reduced by implementing synchronization algorithm which is used to estimate the offset and by using compensation technique these offsets are reduced which improves the system performance. This concept is implemented in Multi-input Multi-output (MIMO) antenna to boost the capacity of the channel for high data rate transmission.
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