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Lin Shi,Bangyin Liu,Shanxu Duan 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
A current balance problem exists in multi-phase LLC converters due to the resonant parameter tolerance. This paper presents acurrent balancing method for interleaved three-phase half bridge LLC converters. This method regulates the phase shift angle ofthe driving signals between the three phases based on a converter with a floating Y-connection. The floating midpoint voltagehas different influences on each phase current and makes the three-phase current balance performance better than midpointnon-floating systems. Phase shift control between modules can further regulate the midpoint voltage. Then three phase currentsharing is realized without adding extra components. The current distributions in a midpoint non-floating system and a midpointfloating system are compared. Then the principle and implementation of the proposed control strategy are analyzed in detail. A3kW prototype is built to verify the validity and feasibility of the proposed method.
Wei, Qikang,Liu, Bangyin,Duan, Shanxu The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6
This paper presents a control bandwidth extension method for inverters with a low carrier ratio. The bandwidth is extended at the price of decreasing the phase margin. Then the phase margin is compensated by introducing an extra leading angle into an inverse Park transformation. The model of the controller with the proposed method is established. The magnitude and phase characteristics are also analyzed. Then the influence on system stability when the leading angle is introduced is analyzed. The proposed method is applied to design an inverter controller with both a large bandwidth and a desired phase margin, and the experimental results verify that the controller performs well in the steady-state and in terms of transient response.
Shi, Lin,Liu, Bangyin,Duan, Shanxu The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
A current balance problem exists in multi-phase LLC converters due to the resonant parameter tolerance. This paper presents a current balancing method for interleaved three-phase half bridge LLC converters. This method regulates the phase shift angle of the driving signals between the three phases based on a converter with a floating Y-connection. The floating midpoint voltage has different influences on each phase current and makes the three-phase current balance performance better than midpoint non-floating systems. Phase shift control between modules can further regulate the midpoint voltage. Then three phase current sharing is realized without adding extra components. The current distributions in a midpoint non-floating system and a midpoint floating system are compared. Then the principle and implementation of the proposed control strategy are analyzed in detail. A 3kW prototype is built to verify the validity and feasibility of the proposed method.
Power conditioning system of Flywheel Energy Storage
Zhongwei Chen,Xudong Zou,Shanxu Duan,Huarong Wei 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In a Flywheel Energy Storage system (FESS), the power conditioning system is the key component of controlling power transfer between the Flywheel and the power system. The dynamics of the power conditioning system directly affect the effect of FESS in dynamic regulation of power system. In this paper, power conditioning system which is made up of a doubly-fed induction machine (DFIM) connected with flywheel, a back-to-back converter for AC excitation and an excitation vector control system is studied. The excitation control strategy is presented for FESS DFIM to improve transient stability and increase transfer capability of power systems. The proposed control method has good dynamics that can respond to the system power demand quickly and accurately. Moreover, the proposed control method has good robust characteristic and applicability to improve the performance of power conditioning system. Simulation and experiment results are performed to evaluate the performance of the proposed control method.
Hu, Guozhen,Chen, Changsong,Shanxu, Duan The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.2
The use of LCL filters in pulse width modulation voltage source converters is a standard solution for providing proper attenuation of high-order grid-current harmonics. However, these filters can cause the undesired effect of resonance. This paper proposes an active damping strategy with harmonics compensation. It can alleviate the harmonics around the resonance frequency caused by the LCL filters. The proposed strategy is attractive since it is simple, does not depend on grid parameters and does not increase the number of sensors. Simulation and experimental results verify the effectiveness of the proposed active damping strategy.
Guozhen Hu,Changsong Chen,Duan Shanxu 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.2
The use of LCL filters in pulse width modulation voltage source converters is a standard solution for providing proper attenuation of high-order grid-current harmonics. However, these filters can cause the undesired effect of resonance. This paper proposes an active damping strategy with harmonics compensation. It can alleviate the harmonics around the resonance frequency caused by the LCL filters. The proposed strategy is attractive since it is simple, does not depend on grid parameters and does not increase the number of sensors. Simulation and experimental results verify the effectiveness of the proposed active damping strategy.
Qikang Wei,Bangyin Liu,Shanxu Duan 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6
This paper presents a control bandwidth extension method for inverters with a low carrier ratio. The bandwidth is extended at the price of decreasing the phase margin. Then the phase margin is compensated by introducing an extra leading angle into an inverse Park transformation. The model of the controller with the proposed method is established. The magnitude and phase characteristics are also analyzed. Then the influence on system stability when the leading angle is introduced is analyzed. The proposed method is applied to design an inverter controller with both a large bandwidth and a desired phase margin, and the experimental results verify that the controller performs well in the steady-state and in terms of transient response.
Jianxing Zhang,Chunhua Zheng,차석원,Shanxu Duan 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.9
In order to achieve the best fuel economy for hybrid vehicles, energy management strategies should optimize the power allocation between power sources. Recently, Pontryagin’s Minimum Principle (PMP) has been attracting attention for the energy management of hybrid vehicles owing to the solution optimality and the calculation instantaneity. In the PMP, there is an important control parameter, which is defined as the co-state variable and difficult to be determined. This research mainly deals with the co-state variable, where the PMP is applied to a fuel cell hybrid vehicle (FCHV) and a hybrid electric vehicle (HEV) respectively, and the effect of the co-state variable on the optimal solution is discussed for each case. The determination of the co-state variable for the cases of certain driving cycles and uncertain driving cycles is discussed, and an online co-state variable updating method is proposed for the uncertain driving cycle cases and its effectiveness is proved.
Han Fu,Qikang Wei,Hao Fu,Bangyin Liu,Shanxu Duan 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.1
The balance of magnetic flux can break and the coupled inductor can be saturated in the case of the switch bridge breakdown of multiphase interleaved inverters. This results in increased coupled-inductor losses, and a decrease in the common-mode inductance, which can further affect the circulation current of the switch bridges, the efficiency, and so on. A fault-tolerant strategy for multiphase interleaved inverters based on a short-circuiting coupled inductor was analyzed. By establishing an equivalent magnetic circuit model of the coupled inductor, the magnetic characteristics of the coupled inductor were analyzed. A method to calculate the windings open-circuit voltage, the short-circuit current, and the circulation current of the inverter were established. The proposed method can be used to guide the engineering application design of fault-tolerant operation strategies, such as the device selection and design of coupling inductance. Finally, the correctness of the analysis was verified by experimental results.