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- 저자 : Zhenxiong Wang (검색결과 4 건)
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Power Balance for Voltage-controlled PV Generator without Robust Voltage Source
Wang Zhenxiong,Zhuo Fang,Lv Nian,Yi Hao,Wu Jiaqi,Yan Hui,Ma Zekun 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Voltage control mode is preferable because of better bus voltage support and low reliance on communication. However, that is difficult to implement on photovoltaic inverter without robust voltage source. Meanwhile, photovoltaic arrays have some power management ability that usually neglected due to the use of MPPT, which in fact damages balanced power flow and a robust and stable grid. As a result, control of dc and ac side of photovoltaic inverter is usually separated and broken, where the dc side is usually supposed as an ideal voltage source and the corresponding relationships are neglected. This paper proposes a control scheme called photovoltaic generator for photovoltaic microgrid without robust voltage source, which imitates the principle of power conversion from mature synchronous generator theory. The scheme focuses on the active participation of solar energy in power management and voltage support. The effectiveness is verified in simulation and experiment.
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Yi, Hao,Zhuo, Fang,Wang, Feng,Li, Yu,Wang, Zhenxiong The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
For a single-phase active power filter (APF), designing a more efficient algorithm to guarantee accurate and fast harmonics extraction with a lower computing cost is still a meaningful topic. The common idea still employs a IRPT-based Park transform, which was originally designed for 3-phase applications. Therefore, an additional virtual signal generation (VSG) link is necessary when it is used in the single-phase condition. This method, with virtual signal generation and transform, is obviously not the most efficient one. Regarding this problem, this paper proposes a novel harmonics extraction algorithm to further improve efficiency. The new algorithm is based on the principle of trigonometric orthogonal functions (TOF), and its mathematical principle and physical meaning are introduced in detail. Its implementation and superiority in terms of computation efficiency are analyzed by comparing it with conventional methods. Finally, its effectiveness is well validated through detailed simulations and laboratory experiments.
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Hao Yi,Fang Zhuo,Feng Wang,Yu Li,Zhenxiong Wang 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
For a single-phase active power filter (APF), designing a more efficient algorithm to guarantee accurate and fast harmonics extraction with a lower computing cost is still a meaningful topic. The common idea still employs a IRPT-based Park transform, which was originally designed for 3-phase applications. Therefore, an additional virtual signal generation (VSG) link is necessary when it is used in the single-phase condition. This method, with virtual signal generation and transform, is obviously not the most efficient one. Regarding this problem, this paper proposes a novel harmonics extraction algorithm to further improve efficiency. The new algorithm is based on the principle of trigonometric orthogonal functions (TOF), and its mathematical principle and physical meaning are introduced in detail. Its implementation and superiority in terms of computation efficiency are analyzed by comparing it with conventional methods. Finally, its effectiveness is well validated through detailed simulations and laboratory experiments.
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Energy Management of Household Microgrid with Multiple Energy Resources for Rural Area
Hui Yan,Nian Lv,Fang Zhuo,Hao Yi,Zhenxiong Wang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The rural villages situated in the loess plateau of China often face with intermittency or even no electricity supply due to inconvenient geometrical location and enormous initial investment. However, renewable resources like solar energy are rich in such area, where microgrid with multiple energy resources is efficient for dealing with the power shortage. This paper proposes a scheme about hybrid household microgrid with multiple resources suitable for both islanded and grid-connected situations. The microgrid integrates photovoltaic, batteries and gasoline generator in source side and constructs AC and DC buses for different load requirements. The possible operation modes are analyzed and energy management strategies are proposed correspondingly. Finally, the microgrid platform has been established in laboratory. Several cases have been tested in experiment and energy management strategies in both islanded and grid-connected situations show good performance. Experimental results verify effectivity of this microgrid scheme and validation of proposed energy management strategies.
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