[논문]A Frequency-Tracking Method Based on a SOGI-PLL for Wireless Power Transfer Systems to Assure Operation in the Resonant State

Tan, Ping-an; He, Haibing; Gao, Xieping

doi:10.6113/jpe.2016.16.3.1056

A Frequency-Tracking Method Based on a SOGI-PLL for Wireless Power Transfer Systems to Assure Operation in the Resonant State 원문보기

Journal of power electronics, v.16 no.3, 2016년, pp.1056 - 1066

Tan, Ping-an (School of Information Engineering, Xiangtan University) , He, Haibing (School of Information Engineering, Xiangtan University) , Gao, Xieping (MOE Key Laboratory of Intelligent Computing & Information Processing, Xiangtan University)

Abstract ▼ AI-Helper

Wireless power transfer (WPT) technology is now recognized as an efficient means of transferring power without physical contact. However, frequency detuning will greatly reduce the transmission power and efficiency of a WPT system. To overcome the difficulties associated with the traditional frequency-tracking methods, this paper proposes a Direct Phase Control (DPC) approach, based on the Second-Order Generalized Integrator Phase-Locked Loop (SOGI-PLL), to provide accurate frequency-tracking for WPT systems. The DPC determines the phase difference between the output voltage and current of the inverter in WPT systems, and the SOGI-PLL provides the phase of the resonant current for dynamically adjusting the output voltage frequency of the inverter. Further, the stability of this control method is analyzed using the linear system theory. The performance of the proposed frequency-tracking method is investigated under various operating conditions. Simulation and experimental results convincingly demonstrate that the proposed technique will track the quasi-resonant frequency automatically, and that the ZVS operation can be achieved.

주제어

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제안 방법

However, it is impossible to accurately regulate the phase difference between the output voltage and current of an inverter in WPT systems, which is not conducive to the operation of Soft-Switching. Therefore, to overcome the difficulties associated with the traditional frequency-tracking methods, this paper proposes a Direct Phase Control (DPC) approach, based on the SOGI-PLL, to provide accurate frequency-tracking for WPT systems. The DPC determines the phase difference between the output voltage and current of an inverter in WPT systems, and the SOGI-PLL provides the phase of the resonant current for dynamically adjusting the output voltage frequency of the inverter.

성능/효과

Firstly, the SOGI-PLL is a computationally expensive and time-consuming algorithm. In order to apply it to WPT applications whose operating frequency is high, a much more efficient processor has to be applied which will increase the cost of the WPT system. Secondly, protective measures have to be taken to prevent damage to the processor and other control circuit during the hardware implementation.
In this paper, the importance of resonant frequency-tracking to a WPT system has been discussed and a DPC approach, based on the SOGI-PLL, to provide accurate frequency-tracking for WPT systems is proposed. The DPC determines the phase difference between the output voltage and current of the inverter in a WPT system, and the SOGI-PLL provides the phase of the resonant current for dynamically adjusting the output voltage frequency of the inverter.
The phase difference of a WPT system and the dead angle imposed by the drivers can be regulated precisely. Moreover, the necessary dead time imposed by the drivers is compatible with the resonant current phase lag control. With the proposed method a WPT system can track the quasi-resonant frequency automatically and the ZVS operation can be achieved.
In order to apply it to WPT applications whose operating frequency is high, a much more efficient processor has to be applied which will increase the cost of the WPT system. Secondly, protective measures have to be taken to prevent damage to the processor and other control circuit during the hardware implementation. Thirdly, the proposed method can be applied on occasions when the output current is sinusoidal.
The proposed method has many advantages for the WPT applications. However, there are still some possible limitations in the proposed method.
This method can be used on occasions when the load has changed and when the resonant parameters have changed. With the proposed frequency-tracking method the maximum transmission power and power-delivery efficiency of a WPT system can be obtained. This is of significance for the research and application of WPT systems.
Moreover, the necessary dead time imposed by the drivers can be compatible with the resonant current phase lag control [15], [16]. With the proposed method a WPT system can track the quasi-resonant frequency automatically and the ZVS operation can be achieved.

후속연구

Firstly, the switching frequency can be promoted if a much more efficient processor, such as a FPGA, is applied. Secondly, with the proposed DPC method, phase compensation can be achieved exactly and it will need to be exploited in the future. It is significant to deal with the phase delay derived from the hardware implementation.
Secondly, protective measures have to be taken to prevent damage to the processor and other control circuit during the hardware implementation. Thirdly, the proposed method can be applied on occasions when the output current is sinusoidal.

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DOI : 10.6113/JPE.2016.16.3.1056 [무료]
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