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69. Stability analysis and dynamic energy management of PV-hybrid storage based DC microgrid

Author

Li Hongbo, Wang Guizhong, Hou Yingwei, and Wu Fengjiang

Subjects
Correctness, Computer science, Energy management, Dynamic energy, Hybrid storage, Microgrid, Electrical impedance, Stability (probability), Automotive engineering, Energy (signal processing)
Abstract

PV-hybrid storage based DC microgrid is an effective large-scale application of PV generation. In this paper, the stability of the PV-hybrid storage based DC microgrid is analyzed based on the source-load impedance model and the stability rule is presented. Furthermore, the dynamic energy management strategy of PV-hybrid storage based DC microgrid is developed to both ensure the stable operation of the DC microgrid and realize the full utilization of the PV generation energy. A downscaled DC microgrid experimental prototype is developed and the detailed experimental results validate the correctness and feasibility of theoretical analysis and energy management strategy.

Published
2019

84. Instantaneous power control of a high speed permanent magnet synchronous generator based on a sliding mode observer and a phase locked loop.

Author

Duan, Jiandong, Fan, Shaogui, Wu, Fengjiang, Sun, Li, and Wang, Guanglin

Subjects
PERMANENT magnet motors, SYNCHRONOUS generators, SLIDING mode control, PHASE-locked loops, ELECTRIC potential
Abstract

This paper proposes an instantaneous power control method for high speed permanent magnet synchronous generators (PMSG), to realize the decoupled control of active power and reactive power, through vector control based on a sliding mode observer (SMO), and a phase locked loop (PLL). Consequently, the high speed PMSG has a high internal power factor, to ensure efficient operation. Vector control and accurate estimation of the instantaneous power require an accurate estimate of the rotor position. The SMO is able to estimate the back electromotive force (EMF). The rotor position and speed can be obtained using a combination of the PLL technique and the phase compensation method. This method has the advantages of robust operation, and being resistant to noise when estimating the position of the rotor. Using instantaneous power theory, the relationship between the output active power, reactive power, and stator current of the PMSG is deduced, and the power constraint condition is analysed for operation at the unit internal power factor. Finally, the accuracy of the rotor position detection, the instantaneous power detection, and the control methods are verified using simulations and experiments. [ABSTRACT FROM AUTHOR]

Published
2018
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98. Study on conducted EMI suppression method in PWM adjustable speed system

Author

Sun Li, Nie Jianhong, and Wu Fengjiang

Subjects
Engineering, Control theory, EMI, Filter (video), business.industry, Power electronics, Electronic engineering, Snubber, Common-mode signal, business, Active filter, Pulse-width modulation, Electromagnetic interference
Abstract

To suppress the conducted EMI of PWM adjustable speed system, the generation mechanism and coupling route have been analyzed in this paper. According the differential generation mechanism, coupling route and source distribution of the interference, corresponding suppression measure were adopted from interference source and coupling route. The overshoot across the power electronics and the value of du/dt can be decreased by using snubber. According to the coupling route of the conducted EMI, the system can be divided into two parts by the converter and the conducted EMI propagation can be blocked from the view of leakage current and common mode voltage. An active filter can be used to compensate the leakage current and cancel the common mode voltage. A new filter configuration is developed for the conducted EMI noise suppression based on the theoretical analysis. The effectiveness of the proposed method is verified by the experimental results.

Published
2005

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