Xác định tần số sét đánh trực tiếp tua bin gió trong điều kiện việt nam

Tap chi Khoa hpc va C6ng nghf 102 (2014) 012-016

Xac dinh so lan set danh tryc tiep tua bin gio trong dieu ki|n Viet Nam

Determination of Number of Lightning Flash to Wind Turbine in Vietnam

Nguyen Quang Thuan'', Tran Van Top'', Phqm Hdng Thinh' ' Truang Dai hoc Bach khoa Ha Noi - SS J, Dai cS Viet, Hai Bd Tnmg. Ha Noi

^Truong Dat hoc Cong nghiep Ha Noi • Phumg Minh Khai, Qugn Bdc TicLiem, Thanh Pho Ha Noi

Din Tda soan 19-02-2013. chdp nhan dang 25-08-2014

Tom tat

Bai vi4t d4 xuat mot phuang phap xac dinh s6 ISn set d^nh tr{K tiep vao tua bin gid xem x^t dSn si/ thay

ddi do cao thu hut set theo vi tri quay cua cac canh du-a tr§n mo hinh di^n hinh hoc (EGM). Phuang phAp

duac Lfng dung tinh toan cho cac loai tua bin co chiSu cao kh^c nhau va dir^c lip d$t t^i cac vOng co m$l

do set khac nhau tren lanh thd Viet Nam. Khi so sanh k4l qui tinh toan vol phuvng phap lEC, ta nhan thiy

s6 lin set dinh vao tua bin gio xac dinh theo phirang phap EGM lan han phuvng phip lEC dac biet vdi

cac tuabin c6 chieu cao tong lan tren 110 m va khu vi/c co mat do set lan. Dieu dd gai y rang phuxmg

phap EGM nen duac su" diing di xac dinh s6 ikn set danh vao tua bin cho cac tinh to^n bao ve chong set

TLF khoa: EGM, lEC, chdng set

Abstract

This paper introduces a method based on the Electro-Geometncal-Method (EGM) to determine the

number of direct lightning strikes on a wind turbine considenng the change of blade height due to rotation.

Different types of turbine installed in areas with vanous flash densities in Vietnam were used to compute

the number of stroke When comparing with lEC method, it was shown that the number of direct stroke to

wind turbines determined by EGM method is higher than that determined by lEC, especially for the wind

turbines higher than 110 m and areas with high flash density Thus, it is suggested that EGM method

should be used to determine the number of direct stroke to wind turbines for lightning protection purposes.

Keywords: EGM, lEC, lightning protection

l.D^tv^ n de

Nhfing nam gan dSy, cong nghe dien gio lien tuc

dupe phat trieo ca ve cong suat va kich thuo-c (hinh 1)

[i],pi.

., j^rTl-'v

Hinh 1. Tinh hinh phat trien cong nghe tua bin gio

the giai [I]

Dien gio da duac trien khai lap dat, van hanh va

dong gop phan dien nang quan trong trong viec phat

trien nen kinh te tai nhieu quoc gia tren toan the gioi,

trong do CO Viet Nam.

Cac tua bin gio thuang dugc lap dat a dja hinh

cao, trong trai nen kha nang bi hu hong do set danh

' Dia chi lien he: Tel: 04,3869.2009

Email: top.tranvan@hust edu.vn

rat cao. De chii dong trong vifc bao ve chong set cho

tua bin gio, ta can xac dinh dupe so lan set danh true

tiep trung binh hang nam.

Viec xac dinh so lan set danh true tiep doi v6i

cac cong trinh tinh tren mat dat nhu duang day truyen

tai dien da tuong doi ro rang [3]-[6], Tuy nhien, doi

voi cong trinh dong, co chieu cao luon thay doi ph^l

thupc vao vi tri cac canh quay nhu tua bin gio thi con

can phai dupe xem xet danh gia.

Bai viet nay se giai thieu m6t phuang phap xac

dinh so lan set danh trirc tiep tua bin gio xet den sir

thay doi dp cao theo vi tri quay cua cac canh tren ca

sa mo hinh dien hinh hpc (EGM) [10]. Phuang phap

se duac ling dung de tinh toan so lan set danh trirc

fiep trung binh nam cho mpt so loai tua bin gio c6 dai

cong suat tir vai tram kW den vai MW (img vai dp

cao khac nhau) lap dat tai viing co mat dp giong set

khac nhau tren lanh tho Vi^t Nam.

2. Mo hinh di^n hinh hoc

Mo hinh dien hinh hpc dupe CF . Wagner dc

xuat diiu tien vao nam 1961 [4], sau do duac nhieu

tac gia nghien cihi phat trien d l danh gia hieu qua bao

ve bang cpl thuse t hoac day thu set ciia cac cong

trinh dudi mat dk nhu- ducmg day tai dien, tram biSn