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- 주제어 : Nine switch converter (검색결과 7 건)
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Modelling and Control of Nine-Switch Converter-Based DFIG Wind Power System
Dongliang Liu,Xu Zhang,Lei Pan,Aqiang Li 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
In this paper, nine-switch converter (NSC) is used to replace the Back-to-Back converter of DFIG wind power system. In order to simplify the control process and improve the performance, the switching function model of nine-switch converter under ABC coordinate system is established, and the mapping relationship between the parameters of NSC’s loads and those of DFIG wind energy conversion system is given. Meanwhile, a Resonant-proportional-integral (Resonant-PI) control strategy for NSC-based DFIG wind energy conversion system is proposed, and the PI controller is used for static control under steady state and the resonant controller for suppressing harmonic content in this method. The proposed method performs better than PI control in harmonic content and dynamic response. The simulations and experimental results verify the validity and reliability of the proposed mathematical model and control algorithm.
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Research on simplified SVPWM strategy for nine-switch converter
Guo, Jia The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.6
Nine-switch converter has promising application prospects in fields where cost, volume and power density are required. The performance of the converter depends to a large extent on the modulation strategy. The existing SVPWM strategy for nine-switch converter requires a lengthy zero-vectors table to make over-modulation judgment, which increased the complexity of the algorithm and the runtime of the program. To improve performance, a novel simplified SVPWM strategy for nine-switch converter is proposed in this paper. The zero-vectors table is replaced by a set of simple formulas for over-modulation judgment and processing. This simplification is based on derivation of the implied reference signals of the SVPWM strategy. The correctness of the proposed algorithm is verified through simulation and experimental results. It is also demonstrated that the proposed simplified algorithm can achieve the same output results as the traditional method with less code length and runtime.
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Pang, Yi,Zhang, Jingmei,Xu, Dongxing,Yin, Chang,Wu, Zifeng,Sun, Hexu,Pan, Lei The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.1
This paper proposes a model predictive control (MPC) algorithm designed for nine-switch converter with output filter (NSCOF) to control two three-phase AC loads independently. A state function of each leg of nine-switch converter (NSC) is established to characterize the internal conditions of the NSC because the traditional model of the NSCOF does not involve the interior model of the NSC. Based on the NSCOF model with the state function of each leg, a prediction model of NSCOF is constructed. The two AC terminals of NSCOF are treated as one module when the MPC is designed. The proposed MPC achieves controlling two three-phase AC loads working under different frequency modes. Furthermore, this algorithm is independent of the modulation method for reducing the difficulty of the controller design and its limits. The simulation and experimental results reveal that the steady-state and dynamic response performance of NSCOF are substantially improved using MPC.
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Direct Power Control without Current Sensors for Nine-Switch Inverters
Lei Pan,Junru Zhang,Kai Wang,Beibei Wang,Yi Pang,Lin Zhu 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
Recently, the nine-switch inverter has been proposed as a dual output inverter. To date, studies on the control strategies for NSIs have been mostly combined with their application. However, in this paper, a mathematical model and control strategy for nine-switch inverters has been proposed in view of the topology. A switching function model and equivalent circuit model of a nine-switch inverter have been built in αβ coordinates. Then, a novel current observer with an improved integrator is proposed based on the switching function model, and a direct power control strategy is proposed. No current sensors are used in the proposed strategy, and only two voltage sensors are employed. The performance of the proposed control method is verified by simulation and experimental results.
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Direct Power Control without Current Sensors for Nine-Switch Inverters
Pan, Lei,Zhang, Junru,Wang, Kai,Wang, Beibei,Pang, Yi,Zhu, Lin The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
Recently, the nine-switch inverter has been proposed as a dual output inverter. To date, studies on the control strategies for NSIs have been mostly combined with their application. However, in this paper, a mathematical model and control strategy for nine-switch inverters has been proposed in view of the topology. A switching function model and equivalent circuit model of a nine-switch inverter have been built in ${\alpha}{\beta}$ coordinates. Then, a novel current observer with an improved integrator is proposed based on the switching function model, and a direct power control strategy is proposed. No current sensors are used in the proposed strategy, and only two voltage sensors are employed. The performance of the proposed control method is verified by simulation and experimental results.
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Tan Luong Van,Trong Huan Nguyen,Nhut Minh Ho,Xuan Nam Doan,Thanh Hai Nguyen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a control strategy of the voltage compensation based on a nine switch converter (NSC) to enhance a low-voltage ride-through (LVRT) capability for a doubly fed induction generator (DFIG) wind turbine system. The nine switch converter connected to a stator-side of the DFIG can enable to compensate the voltage response of the system during the grid faults. For series voltage source converter (VSC), a control algorithm consisting of dual voltage controllers is implemented for the two sequence components in the dq synchronous reference frame. As for shunt voltage source converter (VSC), a control algorithm is carried out in the dq reference frame and incorporates both an inner current control loop and an outer voltage control loop. The effectiveness of the proposed methods is verified by the simulation results for the 2 [MW]-DFIG wind turbine system under unbalanced grid voltage conditions.
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Reduced Semiconductor Three-level Interline Dynamic Voltage Restorer
Lei Zhang,Poh Chang Loh,Feng Gao,Blaabjerg Frede 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The previously proposed Interline Dynamic Voltage Restorer (IDVR) system enhances its capability to compensate for long-term and deep voltage sags from propagating to critical loads in power system without requiring a bulky energy storage device. By having multiple DVRs connected to different transmission feeders, the common energy storage in IDVR system can be dynamically replenished from an unaffected feeder so as to maintain the rated power of critical loads in another feeder where voltage sag appears. However, despite its enhancement in compensation capability, the drawbacks faced by original IDVR system are mainly attributed to its complexity in topology and underutilizations of semiconductors. Aimed to improve the system in these aspects, the paper proposes a new IDVR topology with 25% reduction in semiconductors totally used. The theoretical analysis and its operating principles are also presented. In addition, some constraints faced by this new system are also noted. Finally, simulation results are given to validate the feasibility of proposed topology.
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