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MKS INSTRUMENTS 1249A
歐姆龍
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)電的關鍵設備光伏并網(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)逆變器中的應用，在這個系統(tǒng)中，觸摸屏和逆變控制器通信，完成相關的數(shù)據(jù)采集，資料的保存，報警信息的登錄，圖文并茂顯示逆變器運行參數(shù)和實時狀態(tài)，并通過485或以太網(wǎng)和上位計算機進行遠程通訊，實現(xiàn)整個并網(wǎng)電站的實時監(jiān)控和調(diào)配。
關鍵詞：光伏 逆變器 觸摸屏 DSP
1 引言
隨著全球經(jīng)濟的迅猛發(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，維持長遠的可持續(xù)發(fā)展。在可再生能源中，太陽能以其獨有的優(yōu)勢而成為人們關注的焦點。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展，2006年1月1日實施的《可再生能源法》，標志著太陽能發(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)電設備累計裝機容量將達到2000MW 。
太陽能光伏并網(wǎng)逆變器是整個光伏發(fā)電系統(tǒng)中最為關鍵的設備之一，它是把太陽能電池板產(chǎn)生的直流電能轉(zhuǎn)換為交流電能的設備，運行過程中需要多個參數(shù)進行監(jiān)測、計算、顯示、記錄、保存、報警等處理，需要和上位計算機、逆變控制器、無線GPRS模塊進行通訊，實現(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)逆變器中的應用。
2 系統(tǒng)原理和方案設計
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產(chǎn)生的直流電能進行逆變，轉(zhuǎn)換成同電網(wǎng)同頻率、同相位的交流電，接入電網(wǎng)對外進行輸電。逆變器運行中要把測量的實時參數(shù)送給觸摸屏，進行顯示、記錄等操作，也可和上位機通訊進行遠程監(jiān)控功能。系統(tǒng)結(jié)構圖如下圖所示：
圖1 系統(tǒng)結(jié)構圖
3 WEINVIEW畫面設計要求
本系統(tǒng)采用WEINVIEW MT8100I型號觸摸屏，高品質(zhì)10寸寬屏設計，LED背光模組;采用400MHz RISC CPU，使運行速度更快;內(nèi)置電源隔離保護器，提高了產(chǎn)品的抗干擾能力，適應復雜環(huán)境下運行;多種標準的通訊接口和網(wǎng)絡協(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卡或上位機上，滿足逆變器運行過程中產(chǎn)生的海量數(shù)據(jù)信息。
3.1 觸摸屏主界面設計
主界面顯示逆變器運行的各種運行參數(shù)：PV電壓、PV電流、A、B、C三項交流電壓和電流、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，逆變器運行狀態(tài)指示，實時時間，以及其他操作菜單。下圖分別是主界面的中英文顯示菜單。
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