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The article deals EMC research of 18-pulse circuit consisting of three level neutral point clamped (3L-NPC) converters with selective harmonic elimination (SHE) algorithm. Main object of research is power circuit of wind-driven electric plants based on 18-pulse circuit consisting of three 3L back-to-back (BtB) converters. A review of contemporary condition of power electronics for application in wind...
In this paper, a gearless PM Synchronous Machine (PMSM) maximum power point tracking (MPPT) approach with single stage AC/DC conversion is presented. The proposed topology employs multilevel converter using Switched-Capacitor-Cell-Based (SCCB) converter to convert the three phase AC generated voltage by the PMSG to a fix DC link voltage in a single stage. The advantage of employing multilevel converter...
This paper proposes a low-voltage ride-through (LVRT) protection scheme without fault current limiter (FCL) on the grid-side inverter (GSI), based on energy balance characteristics of permanent magnet synchronous generator (PMSG) wind power systems during the grid voltage drop. The scheme utilizes a series dynamic braking resistor (SDBR) to consume the excess active power from the PMSG transmitting...
In this paper, analysis of single-stage ac/dc converter for small-scale wind power generation system is proposed. The harmonic currents of wind generator are reduced so as to decrease the wind turbine noise. The proposed three-phase wind converter has zero-voltage switch in the active switches. Compared with a traditional two-stage converter, high efficiency and high step-up voltage ratio are also...
The variable wind generator output due to unpredictable variation in wind speed is suitably controlled through a closed loop system employing the buck-boost capability of quasi z-source inverter derived from traditional z-source inverter (ZSI) and is converted into a three phase power. The quasi z-source inverter inheriting all the advantages of the traditional ZSI replaces the conventional PWM inverter...
Synchronized cutting-in control strategy and power control strategy after gird-connection of doubly-fed wind power generator is analyzed in detail. Since two different generator control systems are employed between cutting-in moment, a smooth switching strategy is presented, too. Simulating results are shown that the synchronized cutting-in control strategy adopted can meet grid connecting requirement,...
This paper focuses on the control and modulation of a three-level Neutral Point Clamped (3L-NPC) back-to-back full scale converter for a 10 MW direct-drive wind turbine, equipped with a Permanent Magnet Synchronous Generator (PMSG). Emphasis is oriented towards the investigation of the power losses in the semiconductor devices of three-level converter adopting continuous and discontinuous PWM modulation...
This paper focuses on a battery charging technology utilized in the small wind power generation system, in which the cost should be especially emphasized. An algorithm to make the input voltage track its reference rapidly is proposed in this paper. Meanwhile, a new control strategy is adopted to restrain the charging current by means of dynamically confining the duty-cycle of the buck converter. At...
Wind power is environmentally friendly, which technology is mature and have a high reliability, low cost and its scale benefit is remarkable, is the fastest growing energy. Lots of technical issues about parallel operation with large wind farms must be resolved. For example, parallel operation of a large wind power grid will change the distribution of original power and network loss, giving a new...
This paper proposes a new single-phase 7-level inverter for alternative power generators such as solar cells and wind power generators. Multilevel inverters have an effect in reducing the voltage distortion. They can contribute to the miniaturization of the harmonic filter and reducing the switching loss because the switching frequency can be decreased. This paper shows the control technique of a...
This paper presents a new grid-connected strategy for axial field flux-switching permanent magnet (AFFSPM) wind power generator with improved dynamic response and steady-state performance. Non-controllable convertor and grid-connected PWM rectifier are used as the structure of the main circuit. Triple-state direct power control(DPC) strategy is used on grid side to improve the accuracy of power decoupling...
Western Power has recently imposed stringent low voltage ride-through (LVRT) requirements on wind power plants that seek connection to the Western Australian transmission system. Doubly-fed induction generators (DFIGs) are the dominant technology used in wind generation systems. However, this type of wind generator is very sensitive to fault conditions and without efficient “ride-through” strategy,...
From 2003 through 2008, the Utility Wind Integration Group (UWIG) monitored the performance of one 950 kW turbine located in Palmdale, CA, one 50 kW turbine located in Calverton, NY, and four 50 kW turbines located in Selawik, AK under actual operating conditions. Complete data are available through the UWIG website, with views of real-time and historical data and events. In this paper, we (1) inform...
This paper concerns the difficult problem of dynamic management of T&D controllable equipment. This approach is likely to be necessary in order to ensure reliable operations as the system inputs are becoming very dynamic and hard to predict accurately. Complexity of congestion caused by voltage- and stability-related operating problems will require systematic software tools for managing slow mechanically-switched...
This paper presents a concept design of a hybrid renewable energy system (HRES). The proposed HRES design specifies the operation of the following units: a pumped-storage hydro power plant, a wind power plant and a solar power plant. Since the pumped-storage hydro power plant represents the most complex entity of the HRES, special emphasis is placed on its two control loops: the water tank level control...
For the control target of capturing maximum power for variable speed wind turbine when the wind speed is below the rated wind speed, a switching “optimal” tracking controller of the generator angular velocity is designed. First, the generator optimal angular velocity is identified by using dynamic fuzzy neural network. Then a generator angular velocity optimal tracking controller is designed by using...
A high efficiency wind power converter, mainly constructed by the proposed duty boundary condition boost converter (DBC-BC) is proposed in this paper. It can work in the high efficiency duty cycle to effectively increase the efficiency of wind power converter. A 3kW prototype is designed and implemented to assess the performance of the proposed DBC-BC. Experimental results show that a wind power converter...
This paper deals with the implementation of a operating microgrid based on current real and emulated energy resources which permits the experimentation of various scenarios. This microgrid is able to adapt to different sorts of energy sources, loads and storage devices, and to critical situations that, with testing and emulation, can improve performances. The microgrid is implemented with real time...
This paper presents the emulation of grid-connected wind energy conversion system based on the 30 MIPS Digital Signal controller (DSC) dsPIC30f3011. This system is composed by a three-phase permanent magnet generator, an AC to DC converter and a single phase Voltage Source Inverter (VSI). The inverter was driven using Space Vector Pulse Width Modulation (SVPWM) at a switching frequency of 18 kHz and...
One of the most important issues in the development and utilization of wind-based distribution generation is to quantify the impact of wind power on distribution system reliability. This paper proposes how to deal with wind generators connected to sub-feeders of distribution system in reliability evaluation by means of the network-equivalent approach. The random nature of wind power, which is quite...
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