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With the rapid development of distributed generation (DG), more and more renewable energy is transformed into power through grid-connected inverters. Islanding detection is the key technology of the grid-connected inverter. Because of the shortcomings of the traditional voltage positive feedback islanding detection method in the power balancing, a new method for the detection of the voltage positive...
This paper investigates the energy-efficient power allocation for orthogonal frequency division multiplexing (OFDM) based relay-aided cognitive radio networks (CRNs) with imperfect spectrum sensing considered in the system model. The object is to maximize the energy efficiency measured by the “Throughput per Joule” metric subject to the total transmit power and interference constraints. To solve the...
In this paper, we focus on designing an impedance transformer with two sections and capable of achieving matching at two arbitrary frequencies. Specifically, the problem is formulated as minimizing the reflection coefficient by finding the optimal value of characteristic impedance and line length for the two section transmission line under the constraints of limited value for characteristic impedance...
The power condition system based on converter parallel for large capacity battery energy storage is introduced in this paper. For dispatchable battery energy storage system, the problems of power condition system with PQ control under unbalanced grid are emphasized. A new control scheme concerning both grid-connected current quality and circulating current elimination is proposed for power condition...
To eliminate the instabilities in renewable energy generations such as wind and PV systems, which are mainly caused by weather factors, this paper presents a concept of complementary battery-supercapacitor energy storage system. The power deviations between the output of renewable system and a given power generation plan can be smoothed by this complementary system. To coordinate the different storage...
It is becoming a hot spot to utilize energy storage system(ESS) to smooth out the wind power fluctuations. However, it brings some problems such as the high cost of ESS and the low utilization of the power converter system(PCS) for weather changing. In order to enhance the cost performance, the paper proposes a new control strategy which combines the smoothing and filtering functions of ESS based...
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