Novel Subarray Partition Algorithm for Solving the Problem of Too Low Beam Collection Efficiency Caused by Dividing a Few Subarrays

Li, Jianxiong; Han, Ziyu; Guo, Chuangxin

doi:10.2528/pierm22011701

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…After dividing the subarrays, the entire ar-ray element feed network and array structure are simplified, reducing the cost and the algorithm complexity during the data simulation [12]. The previous optimization method consists of two steps: the first is the arrangement position of the subarrays, followed by the excitation amplitude of the elements in the subarray [13][14][15]. This model has 64 array elements with an aperture of 4.5λ × 4.5λ.…”

Section: Introductionmentioning

confidence: 99%

A Novel Multi-objective Synchronous Optimal Subarray Partition Method for Transmitting Array in Microwave Wireless Power Transmission

Li,

Wang

2024

PIER C

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To improve the beam collection efficiency (BCE) of the microwave wireless power transmission (MWPT) system while reducing the peak sidelobe level outside the receiving area (CSL) and system cost, this paper proposes a new subarray partition technique and a nonuniform sparsely distributed quadrant symmetric planar array (NSDQSPA) model. A particle swarm optimization algorithm based on multiple-objective with nonlinear time-variant inertia and learning factor improved particle swarm optimization (MO-NTVILF-IPSO) is also proposed. The one-step multi-objective subarray partition algorithm adopts dynamic weight and dynamic learning factor to carry out one-step optimization on the array element arrangement of the transmitting array. The optimization algorithm simultaneously optimizes two performance indicators: the ∆BCE, which represents the optimization accuracy for the BCE, and the α ref , which represents the mean square error of the excitation amplitude before and after the subarray partition. Many simulation results show that the BCE is 94.91%, and the CSL is −13.41 dB when the transmitting array with an aperture of 4.5λ × 4.5λ is divided into six subarrays. The simulation results further demonstrate that the proposed subarray division method is appropriate for the MWPT system and that the algorithm in this paper, when the array elements with the same excitation amplitude are divided for the planar transmitting array on the array model, and can guarantee relatively high BCE and relatively low complexity of the system feed network.

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Section: Introductionmentioning

confidence: 99%

A Novel Multi-objective Synchronous Optimal Subarray Partition Method for Transmitting Array in Microwave Wireless Power Transmission

Li,

Wang

2024

PIER C

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“…However, due to changes in load conditions and external environment, as well as the offset of the relative positions of the transmitting and receiving coils, the system is often in a frequency detuning state, resulting in the system being unable to operate at the optimal power and efficiency points [6]. Therefore, it is important to continuously adjust the operating frequency of the WPT system to maintain it in a resonant state [7,8].…”

Section: Introductionmentioning

confidence: 99%

Phase Difference Detection Method for Frequency Tracking in the WPT Systems Using ICST

Yi,

Xie,

2023

PIER C

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Wireless Power Transfer (WPT) technology can achieve non-contact transmission of electrical energy from the power grid or batteries to electrical equipment. To solve the problem of a significant decrease in output power caused by frequency detuning in a magnetic coupled resonant WPT system, it is necessary to dynamically adjust the operating frequency of the system. The frequency tracking control tuning using phase locked loop technology is currently the most commonly used method. A new method using incomplete cross S transform (ICST) for phase difference detection is proposed in this paper. Firstly, the low-pass filter is used to eliminate the noise of the original signals, and the waveform of the original voltage signal is changed from pulsed square wave to sinusoidal wave. Then the signals output by the filter are sampled synchronously to obtain a series of discrete signal sequences, and the sampling frequency varies with the operating frequency and is determined by the PI controller. Finally, the phase vector is obtained by performing ICST on two channel discrete signal sequences, and the phase difference, which is provided for subsequent frequency tracking controller between the primary voltage and the primary current, is extracted from the phase vector. The computational complexity of S transformation is greatly reduced by utilizing incomplete S transformation. The effectiveness of the proposed method is verified by MATLAB simulation experiments. Several experiments were conducted separately. The accuracy, noise immunity, and real-time performance of this method are verified under different working conditions.

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“…Fully populated arrays have been widely studied because of their simple mathematical processing 6 . However, fully populated arrays require large amounts of elements, which leads to high costs 7 . Additionally, when the array element spacing is less than half wavelength value, it will cause mutual coupling 8 .…”

Section: Introductionmentioning

confidence: 99%

“…6 However, fully populated arrays require large amounts of elements, which leads to high costs. 7 Additionally, when the array element spacing is less than half wavelength value, it will cause mutual coupling. 8 Using a suitable method to optimize the sparse array will achieve results similar to those obtained with a fully populated array.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of sparse square arrays with high beam collection efficiency under minimum element spacing constraints

Han

2022

Micro & Optical Tech Letters

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This letter presents a large spacing nonuniform distribution, uniform excitation sparse square array model to maximize beam collection efficiency (BCE) and minimize sidelobe level outside the collection area (CSL) of the transmitting antenna in microwave wireless power transmission (MWPT) systems. We improve the position update parameters in the dynamic weight particle swarm optimization (DWPSO) algorithm by adding multiobjective learning features (MODWPSO). We use MODWPSO to optimize the elements' positions to maximize BCE and minimize CSL and discuss the effect of the minimum element spacing value on BCE and CSL. By comparing the array performance with a typical array model, it can be concluded that the proposed large spacing sparse nonuniform distribution, uniform excitation square array model has higher BCE, lower CSL, and fewer costs.

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Novel Subarray Partition Algorithm for Solving the Problem of Too Low Beam Collection Efficiency Caused by Dividing a Few Subarrays

Cited by 4 publications

References 14 publications

A Novel Multi-objective Synchronous Optimal Subarray Partition Method for Transmitting Array in Microwave Wireless Power Transmission

A Novel Multi-objective Synchronous Optimal Subarray Partition Method for Transmitting Array in Microwave Wireless Power Transmission

Phase Difference Detection Method for Frequency Tracking in the WPT Systems Using ICST

Synthesis of sparse square arrays with high beam collection efficiency under minimum element spacing constraints

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