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DERAXX-071-32
近年來,隨著國內(nèi)外大批的太陽能光伏電站的建立和并網(wǎng)發(fā)電,作為光伏發(fā)電的關(guān)鍵設(shè)備光伏并網(wǎng)逆變器具有廣闊的市場前景。
本文主要介紹WEINVIEW觸摸屏在太陽能光伏并網(wǎng)逆變器中的應(yīng)用,在這個系統(tǒng)中,觸摸屏和逆變控制器通信,完成相關(guān)的數(shù)據(jù)采集,資料的保存,報(bào)警信息的登錄,圖文并茂顯示逆變器運(yùn)行參數(shù)和實(shí)時(shí)狀態(tài),并通過485或以太網(wǎng)和上位計(jì)算機(jī)進(jìn)行遠(yuǎn)程通訊,實(shí)現(xiàn)整個并網(wǎng)電站的實(shí)時(shí)監(jiān)控和調(diào)配。
關(guān)鍵詞:光伏 逆變器 觸摸屏 DSP
1 引言
隨著全球經(jīng)濟(jì)的迅猛發(fā)展,各行業(yè)能耗加劇,石油、煤炭等傳統(tǒng)化石能源日趨枯竭。世界各國都把目光投向了可再生能源,希望可再生能源改變?nèi)祟惖哪茉唇Y(jié)構(gòu),維持長遠(yuǎn)的可持續(xù)發(fā)展。在可再生能源中,太陽能以其獨(dú)有的優(yōu)勢而成為人們關(guān)注的焦點(diǎn)。太陽能是取之不盡、用之不竭、無污染的綠色能源。世界各國都在投入巨資建設(shè)大規(guī)模的太陽能發(fā)電站。我國在光伏研究和產(chǎn)業(yè)方面也取得了較快的進(jìn)展,2006年1月1日實(shí)施的《可再生能源法》,標(biāo)志著太陽能發(fā)電已納入我國的能源發(fā)展規(guī)劃之中。根據(jù)2007年9月發(fā)布的《可再生能源中長期發(fā)展規(guī)劃》,2020年,我國太陽能發(fā)電設(shè)備累計(jì)裝機(jī)容量將達(dá)到2000MW 。
太陽能光伏并網(wǎng)逆變器是整個光伏發(fā)電系統(tǒng)中最為關(guān)鍵的設(shè)備之一,它是把太陽能電池板產(chǎn)生的直流電能轉(zhuǎn)換為交流電能的設(shè)備,運(yùn)行過程中需要多個參數(shù)進(jìn)行監(jiān)測、計(jì)算、顯示、記錄、保存、報(bào)警等處理,需要和上位計(jì)算機(jī)、逆變控制器、無線GPRS模塊進(jìn)行通訊,實(shí)現(xiàn)數(shù)據(jù)交換。本文主要講述WEINVIEW觸摸屏在太陽能光伏并網(wǎng)逆變器中的應(yīng)用。
2 系統(tǒng)原理和方案設(shè)計(jì)
太陽能光伏并網(wǎng)逆變器是把太陽能電池板通過光伏效應(yīng)產(chǎn)生的直流電能進(jìn)行逆變,轉(zhuǎn)換成同電網(wǎng)同頻率、同相位的交流電,接入電網(wǎng)對外進(jìn)行輸電。逆變器運(yùn)行中要把測量的實(shí)時(shí)參數(shù)送給觸摸屏,進(jìn)行顯示、記錄等操作,也可和上位機(jī)通訊進(jìn)行遠(yuǎn)程監(jiān)控功能。系統(tǒng)結(jié)構(gòu)圖如下圖所示:
圖1 系統(tǒng)結(jié)構(gòu)圖
3 WEINVIEW畫面設(shè)計(jì)要求
本系統(tǒng)采用WEINVIEW MT8100I型號觸摸屏,高品質(zhì)10寸寬屏設(shè)計(jì),LED背光模組;采用400MHz RISC CPU,使運(yùn)行速度更快;內(nèi)置電源隔離保護(hù)器,提高了產(chǎn)品的抗干擾能力,適應(yīng)復(fù)雜環(huán)境下運(yùn)行;多種標(biāo)準(zhǔn)的通訊接口和網(wǎng)絡(luò)協(xié)議,方便用戶使用;大容量的數(shù)據(jù)存儲功能,并且可以直接存儲或備份到U盤、SD卡或上位機(jī)上,滿足逆變器運(yùn)行過程中產(chǎn)生的海量數(shù)據(jù)信息。
3.1 觸摸屏主界面設(shè)計(jì)
主界面顯示逆變器運(yùn)行的各種運(yùn)行參數(shù):PV電壓、PV電流、A、B、C三項(xiàng)交流電壓和電流、功率因數(shù)、電網(wǎng)頻率、輸出功率、日發(fā)電量、總發(fā)電量、CO2減排量等,逆變器運(yùn)行狀態(tài)指示,實(shí)時(shí)時(shí)間,以及其他操作菜單。下圖分別是主界面的中英文顯示菜單。
3.2 功率曲線顯示功能設(shè)計(jì)
實(shí)時(shí)功率是逆變器運(yùn)行中一個非常重要的參數(shù),功率曲線圖反映逆變器運(yùn)行的歷史運(yùn)行情況和趨勢。逆變器功率曲線顯示由兩條宏指令完成:
A:逆變器運(yùn)行的實(shí)時(shí)功率計(jì)算與存儲
功率計(jì)算宏指令1分鐘循環(huán)執(zhí)行一次,計(jì)算三相輸出功率。根據(jù)當(dāng)前時(shí)間計(jì)算出功率存儲的地址,把當(dāng)前功率值保存在RW_A對應(yīng)的地址中。 存儲地址=日*1440+時(shí)*60+分。每分鐘保存一次,功率數(shù)據(jù)占一個單元(功率數(shù)據(jù)保存是從0時(shí)開始的全天數(shù)據(jù))。
本系統(tǒng)采用WEINVIEW MT8100I觸摸顯示屏,實(shí)現(xiàn)了和DSP數(shù)字信號處理器的實(shí)時(shí)通訊。圖文并茂的顯示了并網(wǎng)逆變器運(yùn)行的各個參數(shù)和狀態(tài),曲線坐標(biāo)顯示了逆變器的功率參數(shù)和其趨勢效果圖。大容量的數(shù)據(jù)存儲功能,保存了逆變器詳細(xì)的歷史運(yùn)行數(shù)據(jù)。靈活、多樣的通訊接口方便實(shí)現(xiàn)光伏并網(wǎng)電站的監(jiān)控。觸摸屏可靠、穩(wěn)定的運(yùn)行,方便、靈活的操作,大大提高并網(wǎng)逆變器產(chǎn)品的市場競爭力,取得了良好的社會效益和經(jīng)濟(jì)效益。
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