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IET Renew.Power Gener.,2009,Vol.3,No.1,pp.65–7465 doi:10.1049/iet-rpg:20070116&The Institution of Engineering and Technology2008
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2C P2l curves for different pitch angles
of pitch controller rvo system.In this study,
over the rated speed is not ud.Therefore
controller is not considered throughout the study.
Modelling of the ECS
怜惜
ECS consists of EDLC and power electronic devices,赛龙舟的图片
补助申请书怎么写ud as ESS.Schematic diagram of the ECS
in Fig.3.
Modelling of EDLC
lumped model of EDLC cell[19]shown in
express the terminal characteristic precily[23,
the distributed model is ud in the simulation
as shown in Fig.4b.The parameters of single
the lumped and distributed model are shown
IET Renew.Power Gener.,2009,Vol.3,No.1,pp.65–7467 doi:10.1049/iet-rpg:20070116&The Institution of Engineering and Technology2008
4.2Pul width modulation(PWM) voltage source converter(VSC)modelling The well-known cascaded control scheme is developed control the voltage source converter(VSC)of ECS prented in Fig.
农村办厂好项目5.Aim of the control is to maintain wind farm terminal(at point K),at the desired reference level and to maintain constant DC-link voltage at the rated value of5.0kV.The ECS is coupled to the single step down transformer(66kV/2.73 leakage reactance(ba value100MVA). DC link capacitor(C in Fig.3)is30mF. of the PI controllers in Fig.5are shown
Schematic diagram of energy capacitor system(ECS)
Table3Lumped model parameters of EDLC cell
Rated voltage 2.7V
capacitance,Cb3000F
internal resistance,Rb9m V Table5Distributed model parameters of EDLC
Capacitance Internal resistance
Cb1 1.76F Rb10.012
Cb244.00F Rb20.308
Cb342.24F Rb30.295
68IET Renew.Power Gener.,2009,Vol.3,No.1,pp.65–74 &The Institution of Engineering and Technology2008doi:10.1049/iet-rpg:20070116 www.ietdl
paper is proposing ECS with suitable control strategy enhance the LVRT capability offixed speed generator under network disturbance.When a network occurs,the reactive power demand of wind far
m supplied according to the error signal between the terminal voltage,V k,and the reference voltage.the other hand,the ECS is forced to work transient energy by switching off the switch, DC–DC buck/boost converter.Therefore
美女穿内衣图片can be controlled and this would be effective the transient stability of the rest of the system. realistic respons,the two-mass shaft model considered.All types of dampings are disregarded the wor scenario[31].Symmetrical3LG
the network disturbance,which occurs at
and F2in Fig.1.
Electromagnetic transient simulation
using PSCAD/EMTDC[36],where currents are reprented as instantaneous quantities. (Figs.8–21),RMS values for voltages calculated bad upon the instantaneous simulation time step is chon to be0.01ms.
属狗的今年几岁block diagram of PWM bad VSC
Parameters of PI controllers in Fig.5
PI-1PI-2PI-3PI-4
3.0 2.0 3.00.03
0.10.0040.10.002
6Control block of DC–DC buck/boost converter
voltage ride-through standard t by FERC,US
IET Renew.Power Gener.,2009,Vol.3,No.1,pp.65–7469 doi:10.1049/iet-rpg:20070116&The Institution of Engineering and Technology2008
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Figure12DC-link voltage of ECS(Ca1,3LG fault)
Figure13EDLC bank voltage(Ca1,3LG fault)
10Load angle of SG(Ca1,3LG fault)
