混合發(fā)電能量管理系統(tǒng)1.引言風(fēng)力與太陽(yáng)能電池發(fā)電組成的混合發(fā)電系統(tǒng)又叫做風(fēng)/光互補(bǔ)系統(tǒng)，由于風(fēng)和太陽(yáng)能都有一些共同的缺點(diǎn)，如能量密度低、穩(wěn)定性差、 受天氣影響不連續(xù)、有季節(jié)性強(qiáng)弱變化、太陽(yáng)能日夜間斷等。分別由風(fēng)力和太陽(yáng)能發(fā)電來(lái)供電，其供電的可靠性大大降低。風(fēng)能、太陽(yáng)能具有一定的互補(bǔ)性，如白天太陽(yáng)光強(qiáng)，夜晚風(fēng)多，夏天日照好、風(fēng)弱；冬春季節(jié)風(fēng)大而陽(yáng)光相對(duì)較弱。開(kāi)發(fā)風(fēng)力一太陽(yáng)能互補(bǔ)發(fā)電系統(tǒng)，將風(fēng)力與太陽(yáng)能技術(shù)加以綜合利用，從而構(gòu)成一種互補(bǔ)的可分散布點(diǎn)的新型能源，將是本世紀(jì)能源結(jié)構(gòu)中一個(gè)新的增長(zhǎng)點(diǎn)。有條件時(shí)通過(guò)搭配適當(dāng)容量的蓄電池或接入市電作為備用電源，可使運(yùn)行費(fèi)用大大的降低、供電的可靠性大大的提高。目前國(guó)內(nèi)主要針對(duì)獨(dú)立的風(fēng)力發(fā)電、光伏發(fā)電及風(fēng)一光互補(bǔ)發(fā)電控制系統(tǒng)的研究較多。在設(shè)計(jì)風(fēng)一光發(fā)電系統(tǒng)中，普遍采用的設(shè)計(jì)思路是根據(jù)負(fù)載每天的總耗電量，和由當(dāng)?shù)貧庀髷?shù)據(jù)得到的日輻射量來(lái)確定太陽(yáng)能電池陣列、風(fēng)力發(fā)電機(jī)的容量，再來(lái)確定可再生能源發(fā)電控制裝置的功率和蓄電池容量，但是在混合發(fā)電系統(tǒng)的運(yùn)行控制和優(yōu)化管理方法方面的研究較少。由于風(fēng)電機(jī)組、太陽(yáng)能電池陣列的輸出功率和負(fù)荷功率受外界因素的影響，變動(dòng)范圍較大，因而對(duì)控制和優(yōu)化發(fā)電系統(tǒng)的能量管理也提出了較高的要求。本文針對(duì)系統(tǒng)運(yùn)行的特點(diǎn)設(shè)計(jì)了一能量管理系統(tǒng)（Energy Management System, 簡(jiǎn)稱(chēng) EMS）來(lái)提高系統(tǒng)的運(yùn)行效率和可靠性。2．系統(tǒng)的構(gòu)成本文以華南理工大學(xué)新能源中心的分散式風(fēng)力一太陽(yáng)能混合發(fā)電系統(tǒng)為研究景，系統(tǒng)的結(jié)構(gòu)圖如圖 2-1 示：由圖 2-1 可知，系統(tǒng)包括以下幾部分：風(fēng)力發(fā)電機(jī)及其控制器：共 5 套，風(fēng)機(jī)的最大輸出功率 15kw/臺(tái)，風(fēng)力機(jī)發(fā)電控制器使風(fēng)力機(jī)始終處于最大功率輸出狀態(tài)。太陽(yáng)能電池及其發(fā)電控制器：共 5 組，太陽(yáng)能電池每組峰瓦 3kw，太陽(yáng)能發(fā)電控制器使太陽(yáng)能電池陣列始終處于最大功率輸出狀態(tài)。數(shù)據(jù)采集系統(tǒng)（Data Acquisition System，簡(jiǎn)稱(chēng) DAS）：用于采集檢測(cè)太陽(yáng)能電池輸出功率、風(fēng)力發(fā)電機(jī)輸出功率、系統(tǒng)直流部分的電壓、負(fù)載功率，并把采集到的系統(tǒng)運(yùn)行有關(guān)信息，提供能量管理系統(tǒng)進(jìn)行分析處理。能量管理系統(tǒng)：根據(jù)數(shù)據(jù)采集系統(tǒng)提供的系統(tǒng)各功能單元運(yùn)行參數(shù)，來(lái)實(shí)現(xiàn)對(duì)系統(tǒng)的有效管理和控制。緩沖電容：實(shí)現(xiàn)系統(tǒng)直流部分電壓的平穩(wěn)。負(fù)載和逆變器：新能源中心的負(fù)載分類(lèi)，一類(lèi)負(fù)載是能源中心辦公和實(shí)驗(yàn)所必須保證的負(fù)載；二類(lèi)負(fù)載是能源中心的溫室控制等輔助設(shè)施所需的電能，當(dāng)可再生能源輸出電能有多余的能量時(shí)，才投入的負(fù)載。系統(tǒng)的負(fù)載和直流部分的連接是通過(guò)逆變器來(lái)實(shí)現(xiàn)的，直流側(cè)經(jīng)過(guò) PWM 逆變器，轉(zhuǎn)換為電壓恒定、波形良好的交流電能，提供給負(fù)載。市電控制器：當(dāng)可再生能源提供的電能不能滿足系統(tǒng)一類(lèi)負(fù)載所需時(shí)，由市電來(lái)作補(bǔ)充；即把市電作為備用電源，通過(guò)并網(wǎng)控制器來(lái)控制市電的投入和切除。在風(fēng)力、太陽(yáng)能和負(fù)荷構(gòu)成的發(fā)電、用電系統(tǒng)中，由于風(fēng)速、日照強(qiáng)度和其它氣候條件的變化，風(fēng)電機(jī)組、太陽(yáng)能電池陣列的輸出功率和負(fù)荷功率都存在著較大范圍的波動(dòng)，因而對(duì)能量管理系統(tǒng)提出了很高的要求。本文針對(duì)正在建設(shè)中的華南理工大學(xué)新能源中心分散式風(fēng)力一太陽(yáng)能混合發(fā)電系統(tǒng)，設(shè)計(jì)了一個(gè)能量管理系統(tǒng)，根據(jù)系統(tǒng)發(fā)電、負(fù)荷用電狀況，來(lái)管理系統(tǒng)的供電模式，靈活調(diào)節(jié)各部分供電量的比例。能量管理系統(tǒng)在可再生能源大于負(fù)荷需求時(shí)，切斷部分太陽(yáng)能、風(fēng)電機(jī)；可再生能源不能滿足基本負(fù)載要求時(shí)，在充分利用可再生能源的前提下，不足部分由市電來(lái)進(jìn)行適當(dāng)?shù)难a(bǔ)充，取系統(tǒng)的最大負(fù)荷為 750KW。在供電系統(tǒng)中，系統(tǒng)發(fā)電與負(fù)荷有功功率的平衡，是系統(tǒng)安全穩(wěn)定運(yùn)行的必要條件。由于系統(tǒng)的負(fù)荷是由直流電壓經(jīng)逆變器提供的，直流電壓的穩(wěn)定性直接影響系統(tǒng)給負(fù)載提供電能的質(zhì)量，在這里取系統(tǒng)直流母線電壓 為系統(tǒng)dcU的被控量，并取其工作范圍為 192V－240V，選擇 216V 為直流部分的額定電壓。為了不使系統(tǒng)的結(jié)構(gòu)過(guò)于復(fù)雜，在這里對(duì)蓄電池的處理不予以考慮。即能量管理系統(tǒng)結(jié)構(gòu)圖如圖 2－2 所示：, , , 和 分別為系統(tǒng)的直流母線電壓、風(fēng)力機(jī)可輸出的最大dcUWmPV1L2P功率、太陽(yáng)能電池陣列可輸出的最大功率、系統(tǒng)中一類(lèi)負(fù)載所需功率和二類(lèi)負(fù)載所需的功率；和 分別為系統(tǒng)的風(fēng)力機(jī)輸出利用系數(shù)和太陽(yáng)能電池陣列輸出利用率，WKPV即 為風(fēng)力機(jī)啟用的臺(tái)數(shù)與風(fēng)力機(jī)總數(shù)之比, 為太陽(yáng)能陣列啟用的組數(shù)和PVK太陽(yáng)能陣列組總數(shù)之比。取 、 ［0,0.2,0.4,0.6,0.8,1］ ，則 5 和 5WKPV?WK分別表示風(fēng)力機(jī)啟用的臺(tái)數(shù)和太陽(yáng)能電池陣列啟用的組數(shù)；PVK和 ，分別為市電開(kāi)關(guān)控制變量和二類(lèi)負(fù)載的提供率，本文定義 、S2L S為開(kāi)關(guān)函數(shù)，取值“0” 或“1” ；當(dāng) ＝1 表示電網(wǎng)接入混合發(fā)電系統(tǒng)，2L SK＝0 表示電網(wǎng)從混合發(fā)電系統(tǒng)中切除； ＝ 1 表示二類(lèi)負(fù)載接入混合發(fā)電SK2L系統(tǒng)投入工作， ＝0 則表示二類(lèi)負(fù)載從混合發(fā)電系統(tǒng)切除。2L針對(duì)系統(tǒng)運(yùn)行的特點(diǎn)，制定以下設(shè)計(jì)規(guī)則：（1）規(guī)則一構(gòu)成混合發(fā)電系統(tǒng)的風(fēng)電機(jī)組功率容量較大，因而選擇以風(fēng)電機(jī)組供電為主，太陽(yáng)能電池陣列作為能量微調(diào)部分。（2）規(guī)則二根據(jù)系統(tǒng)的工作特點(diǎn)，取直流側(cè)端電壓 期望值為 216V，當(dāng)可再生能源dcU可輸出最大功率大于負(fù)載要求時(shí)，可再生能源不向電網(wǎng)輸送電能。（3）規(guī)則三在這里取直流母線電壓低于 192V 時(shí)，通過(guò)并網(wǎng)控制器接通電網(wǎng)，由市電來(lái)補(bǔ)充負(fù)載所需短缺部分的電能，并由本文后面章節(jié)介紹的并網(wǎng)控制器使直流母線電壓維持 192V，即＝1SK當(dāng)吸200V 時(shí)，關(guān)閉并網(wǎng)控制器，即＝0S（4）規(guī)則四二類(lèi)負(fù)載幾：為混合發(fā)電系統(tǒng)中輔助設(shè)施所需的電能，當(dāng)可再生能源輸出電能有多余的能量時(shí)，才投入的負(fù)載。二類(lèi)負(fù)載未工作情況下，其負(fù)載功率檢測(cè)較困難，為了避免二類(lèi)負(fù)載的頻繁投徹 ；本文根據(jù)系統(tǒng)的負(fù)載配置情況，設(shè)二類(lèi)負(fù)載最大功率為 ，當(dāng)2mLP+ ＞ +WmPV1l2mLP把二類(lèi)負(fù)載投入運(yùn)行，即＝12LK（5）規(guī)則五為了提高系統(tǒng)直流部分電壓的穩(wěn)定性，當(dāng)吸230V 時(shí)，自動(dòng)把二類(lèi)負(fù)載投入運(yùn)行，即bcU＝12L240V 時(shí)，自動(dòng)切除所有的可再生能源發(fā)電裝置對(duì)直流母線進(jìn)行供電，bc即= = =0， ＝1WKPVS2LK針對(duì)系統(tǒng)多輸入多輸出、變化復(fù)雜的特點(diǎn)，本系統(tǒng)采用智能控制中的模糊控制技術(shù)（Fuzzy Control, 簡(jiǎn)稱(chēng) FC）來(lái)實(shí)現(xiàn)對(duì)系統(tǒng)進(jìn)行管理和控制；研究并設(shè)計(jì)了一種基于分級(jí)模糊控制（Hierarchical Fuzzy Control，簡(jiǎn)稱(chēng) HFC）算法的能量管理系統(tǒng)。3.模糊控制模糊集合和模糊控制的概念是由美國(guó)加利福尼亞大學(xué)著名教授 L.A.Zadeh在其 Fuzzy Sets、Fuzzy Algorithm 和 Rationale for Fuzzy Control 等著名論著中首先提出一種完全不同于傳統(tǒng)數(shù)學(xué)與控制理論的智能理論。它的產(chǎn)生不僅拓廣了經(jīng)典數(shù)學(xué)的數(shù)學(xué)基礎(chǔ)，而且是使計(jì)算機(jī)科學(xué)向模擬人類(lèi)思維方面發(fā)展的重大突破。模糊集合將人的判斷、思維過(guò)程用比較簡(jiǎn)單的語(yǔ)言和數(shù)學(xué)形式直接表達(dá)出來(lái)。使得復(fù)雜系統(tǒng)按人類(lèi)的思維方式進(jìn)行運(yùn)作和處理成為可能，為模糊控制器的形成奠定了基礎(chǔ)，并得到世界各國(guó)的學(xué)者和工程技術(shù)人員廣泛的重視和應(yīng)用。模糊控制通過(guò)模糊集合和邏輯推理方法把人的經(jīng)驗(yàn)形式化，模型化，變成計(jì)算機(jī)可以接受的控制模型和語(yǔ)言，讓計(jì)算機(jī)來(lái)代替人來(lái)進(jìn)行有效的實(shí)時(shí)控制。模糊控制器的組成框圖如圖 2-3 所示：它包括：輸入量模糊化接口，知識(shí)庫(kù)（數(shù)據(jù)庫(kù)和規(guī)則庫(kù)） ，推理機(jī)和解模糊接口。（1）模糊化接口模糊控制器的輸入通常是確定的量，必須要模糊化后，變?yōu)榭刂破魉J(rèn)識(shí)的語(yǔ)言或變量才能被控制器使用，模糊化接口是將確定的輸入量轉(zhuǎn)化為模糊量，它也是模糊控制器的輸入接口。（2）知識(shí)庫(kù)知識(shí)庫(kù)描述形式主要有兩種：數(shù)據(jù)庫(kù)和規(guī)則庫(kù)。數(shù)據(jù)庫(kù)是存放所有輸入、輸出變量的全部模糊子集的隸屬度關(guān)系的矢量值；若論域?yàn)檫B續(xù)域，數(shù)據(jù)庫(kù)則為相應(yīng)的隸屬函數(shù)。規(guī)則庫(kù)是基于專(zhuān)家知識(shí)和有豐富經(jīng)驗(yàn)的操作人員根據(jù)長(zhǎng)期積累的經(jīng)驗(yàn)，按人的直覺(jué)推理的一種語(yǔ)言表示形式。最常用的為 if－then，else, also, or 等，如2 維模糊推理規(guī)則可表示為R：if（偏差 is a；差變化率 is b；）then（控制量 is c；）規(guī)則庫(kù)就是用來(lái)存放全部模糊控制規(guī)則，在推理時(shí)為 “推理機(jī)”提供推理的依據(jù)。（3）推理和解模糊接口推理時(shí)，控制器推理機(jī)根據(jù)輸入的模糊量，經(jīng)模糊控制規(guī)則來(lái)求解模糊關(guān)系方程，獲取模糊控制器的模糊控制量。由推理機(jī)獲得的控制量是一個(gè)模糊矢量，不能直接被用來(lái)控制被控對(duì)象，還必須轉(zhuǎn)換成確定的控制量，我們把這一過(guò)程稱(chēng)為解模糊或模糊量的清晰化。通常把推理和輸出端具有把模糊量轉(zhuǎn)化為清晰值的過(guò)程稱(chēng)為解模糊。4.EMS 的設(shè)計(jì)本文所設(shè)計(jì)的風(fēng)能一太陽(yáng)能混合發(fā)電系統(tǒng)的結(jié)構(gòu)框圖如圖 2-6 所示：為了提高可再生能源的利用效率，在風(fēng)能和太陽(yáng)能能夠滿足負(fù)載要求的情況下，負(fù)載所需求的能源則由風(fēng)能和太陽(yáng)能提供；在風(fēng)能和太陽(yáng)能不能滿足負(fù)載要求時(shí)，在充分利用可再生能源的基礎(chǔ)上，負(fù)載所需求的能源由風(fēng)能、太陽(yáng)能和電網(wǎng)共同提供。由系統(tǒng)的結(jié)構(gòu)圖可知，系統(tǒng)直流母線電壓的變化直接影響系統(tǒng)給負(fù)載提供電能的質(zhì)量和可靠性，因而穩(wěn)定的直流電壓是系統(tǒng)工作可靠性和性能的一個(gè)重要指標(biāo)。取系統(tǒng)直流母線電壓為被控量，由圖 2－6 可得系統(tǒng)的數(shù)學(xué)模型：其中 —直流母線電壓， —風(fēng)力發(fā)電裝置輸出電流， —太陽(yáng)能發(fā)電dcUwi PVi裝置輸出電流， —系統(tǒng)輸送到負(fù)載得電流， —電網(wǎng)輸送電直流部分得電流，Li SiC—直流平波電容容量。通?？稍偕茉窗l(fā)電裝置的投資較大，為了充分發(fā)揮其發(fā)電的效率，縮短系統(tǒng)成本的回收周期，發(fā)電裝置多采用最大功率輸出為控制目標(biāo)。設(shè)每臺(tái)風(fēng)力發(fā)電機(jī)和每組太陽(yáng)能電池陣列都工作在的最大輸出功率狀態(tài)，風(fēng)力發(fā)電和太陽(yáng)能發(fā)電裝置輸出總功率分別為 和 ，系統(tǒng)對(duì)其利用率分別 和 ，則WmPV WKPV（2-3）式可改寫(xiě)為 系統(tǒng)的結(jié)構(gòu)圖如圖 2-7 所示：由圖 2-7 可知，系統(tǒng)的輸入量較多，針對(duì)風(fēng)力一太陽(yáng)能混合發(fā)電系統(tǒng)的特點(diǎn)，在這里我們采用分級(jí)模糊控制的策略來(lái)對(duì)系統(tǒng)進(jìn)行控制，并設(shè)計(jì)一個(gè)四級(jí)的分級(jí)模糊控制器來(lái)實(shí)現(xiàn)對(duì)混合發(fā)電系統(tǒng)進(jìn)行能量管理和控制。系統(tǒng)結(jié)構(gòu)圖如圖 2-8 所示：系統(tǒng)的負(fù)荷是由直流電能直接提供和經(jīng)逆變器輸出，直流電壓的穩(wěn)定性成為直接影響是系統(tǒng)輸出交流電能質(zhì)量、穩(wěn)定性與可靠性的關(guān)鍵因素。因而選擇直流部分實(shí)際直流電壓 和直流電壓變化量 ，作為系統(tǒng)的第一級(jí)輸入，dcUdcu?輸出為直流電壓等效值 ：1y是綜合直流電壓 和直流電壓變化量 ， 得出 未來(lái)的狀態(tài)。實(shí)1ydcUdcu?dcU質(zhì)上，它反映了系統(tǒng)在當(dāng)前直流電壓基礎(chǔ)上，若不改變控制量，則下一個(gè)采樣時(shí)刻直流側(cè)電壓的預(yù)測(cè)值即為 ，由于在下一個(gè)采用周期到來(lái)之前，系統(tǒng)的輸1y出控制量，經(jīng)模糊推理己發(fā)生改變，因而在這里定義 為系統(tǒng)直流部分電壓的1y等效值。第二級(jí)以第一級(jí)輸出的直流電壓等效值 和負(fù)荷 作為該級(jí)模糊控制器的1LP輸入，輸出 取為負(fù)載相對(duì)系統(tǒng)能量負(fù)載強(qiáng)度：2y是綜合負(fù)荷 和負(fù)載直流電壓等效值 得出的一個(gè)參變量。當(dāng) 大于2yLP1y1y期望值時(shí)，系統(tǒng)負(fù)荷所需的能量除了由可再生能源提供外，還有一部分需由直流儲(chǔ)能元件電容，才能降低直流側(cè)電壓，使直流側(cè)電壓 向期望值方向變化，dcU即負(fù)荷需由可再生能源提供能量被減弱；當(dāng) 小于期望值時(shí)，可再生能源除了1y向系統(tǒng)負(fù)荷提供能量外，還要向直流儲(chǔ)能元件電容補(bǔ)償電能，來(lái)提高直流側(cè)電壓，從可再生能源角度來(lái)看，所需提供能量在負(fù)載的基礎(chǔ)上被加強(qiáng)：因而在這里定義輸出 為負(fù)載相對(duì)系統(tǒng)能量的負(fù)載強(qiáng)度。2y第三級(jí)以影響次大的風(fēng)能輸出最大功率 和負(fù)載相對(duì)系統(tǒng)能量強(qiáng)度 作為4x2y第三級(jí)模糊控制器的輸入，輸出 為風(fēng)能的利用率 ，作為輸出提供給風(fēng)電3yWK機(jī)控制器，控制風(fēng)電機(jī)開(kāi)啟的臺(tái)數(shù)，其中 為3太陽(yáng)能輸入 和風(fēng)機(jī)提供系統(tǒng)相對(duì)能量負(fù)荷強(qiáng)度不足部分 ＝75 -5x 6x2y作為第四級(jí)模糊控制器的輸入，取輸出為為太陽(yáng)能發(fā)電的利用率 即3y4x PVK為：第四級(jí)控制器的輸出 和第三級(jí)控制器的輸出 作用到發(fā)電控制裝置給負(fù)4y3y載供電。當(dāng) 和 ，不能滿足負(fù)荷要求，直流部分電壓低于 192Ｖ時(shí)，接通電4y3網(wǎng)，由電網(wǎng)和風(fēng)能-太陽(yáng)能混合發(fā)電系統(tǒng)共同提供電能；當(dāng)直流部分電壓高于240Ｖ時(shí)，則切斷風(fēng)力發(fā)電機(jī)和太陽(yáng)能發(fā)電裝置向系統(tǒng)供電，直至直流端電壓低于 220Ｖ時(shí)再重新投入工作。這樣，通過(guò)分級(jí)結(jié)構(gòu)的逐步求精，逐步逼近目標(biāo)函數(shù)，從而達(dá)到理想的控制效果。5.總結(jié)本文首先簡(jiǎn)單介紹了風(fēng)力太陽(yáng)能混合發(fā)電系統(tǒng)的配置，隨后針對(duì)該多輸入多數(shù)出變量的分散式風(fēng)力太陽(yáng)能混合發(fā)電的能量管理系統(tǒng)，研究設(shè)計(jì)了一個(gè)基于遺傳算法分級(jí)模糊控制算法，并給出了該系統(tǒng)采用分級(jí)模糊控制的詳細(xì)設(shè)計(jì)步驟。最后，借助于仿真，將上述算法應(yīng)用于風(fēng)能—太陽(yáng)能混合發(fā)電的能量管理系統(tǒng)中。仿真結(jié)果表明，基于分級(jí)模糊控制器能夠?qū)Ψ稚⑹斤L(fēng)力太陽(yáng)能混合發(fā)電系統(tǒng)實(shí)施較好的管理和控制，并可取得良好的效果。這也為多種可再生能源混合發(fā)電系統(tǒng)的管理和控制，提供了一條有效的解決途徑。Energy Management System of Admixture Electricity-generating1.One prefaceThe admixture that wind force and solar cells generate electricity to constitute generates electricity the system and is called the breeze/ light to repair the system with each other, all having some common weakness because of the breeze and solar energies, such as the energy density low, the stability is bad and is subjected to the weather influence not to continue, have the strong weak conjugation, solar energy of seasonal to interrupted etc. day and night. Be generate electricity by the wind force and solar energy respectively to the power supply, the credibility of its power supply lowers consumedly.The wind energy, solar energy has to repair sex with each other certainly, if the sun light of daytime is strong, the night breeze is many, the summer sunshine good, the breeze is weak; The spring stanza breeze of winter is strong but the sunlight is opposite weaker. Develop the wind force a solar energy to supply again to give or get an electric shock the system with each other, take into wind force and the solar energy techniques to synthesize the exploitation, thus constitute a kind of repair with each other of can scatter the new energy that cloth order, will is a new growth to order in this energy structure of century. Have the condition pass the storage battery of match the appropriate capacity or connect into the city to give or get an electric shock the conduct and actions back up power supply, can make circulate the expenses to lower consumedly, huge exaltation of the credibility of the power supply.Local mainly generate electricity to independent wind power, the light currently and the breeze a light supplies again the research of the electricity control system with each other more. In design the breeze a light generate electricity system, the design way of thinking of the widespread adoption according to load everyday total to consume the electricity quantity, and radiate the quantity from the day that the local weather data get to the capacity of the certain solar cell array, the wind power machine, then come certain can the renewable energy generate electricity the power and the storage battery capacities of control the devices, but at mix with the movement of generate electricity the system control and excellent turn the research of manage the method less.Because the exportation power and the burden powers of the breeze electrical engineering set, the solar cell array is affect by the outside factor, changing the scope to compare greatly, as a result turned the energy of generate electricity the system management to also put forward the higher request towards control and excellently. This text aims at the movement efficiency and credibility’s that the characteristics of the system movement designs one energy management system( energy management system, brief name EMS) to raise the system.2.Composing of the systemsThis text with the south science and engineering university dispersion type wind force a solar energy of the new energy center admixture generates electricity the system for study the view, the structure diagram of the system, such as 2 －1 of figure 1 show:May known by the chart 2-1, the system includes following several parties:The wind power machine and its controller: Total 15KW / sets of the biggest exportation power of the breeze machine, the wind force machine generates electricity the controller to make the wind force machine been placed in the biggest power to output the appearance always.Solar cell and its electricity generation controller: The altogether 5 groups, solar cell each group of peaks tile 3 k W, the solar energy electricity generation controller causes the solar cell array throughout to be at the maximum work rate output condition.The data collects the system:( the data acquires the system, the brief name DAS)Used for the electric voltage, the load power that collects to examine the solar cell exportation power, the wind power machine to output the power, the system direct current part, and circulate the relevant information to the system that collect, providing the energy management system to carry on the analytical processing.The energy manages the system: collect each function of system unit movement parameter that system provide according to the data, carry out the valid management to the system and controls.Buffer electric capacity: carry out parts of electric voltages of the system direct current steady.Load and inversion: The new energy center load classification, a kind of load is a load which the energy center work and the experiment must guarantee; Two kind of loads are the electrical energies which energy center ancillary facilities and so on greenhouse control needs, when the renewable energy output electrical energy has the unnecessary energy, only then invests load. The system load and the direct component connection is, the direct current side which realizes through the inversion after PWM inversion, transforms for the voltage is constant, the profile good exchange electrical energy, provides for the load.The city gives or get an electric shock the controller: When can the electricity that renewable energy provide can satisfy a load of system need, giving or get an electric shock from the city to make the complement; namely chase the city to give or get an electric shock the conduct and actions back up power supply, pass combine the net controller to control the devotion and the excision of the city electricity.In the wind power, the solar energy and the load constitution electricity generation, uses electricity in the system, as a result of the wind speed, the sunshine intensity and other climatic conditions changes, the wind electrical machinery, the solar cell array output and the load power all has comparatively wide range the undulation, thus set the very high request to the energy management system management system.This article in view of is being constructed a South China technical University new energy center disperser -like wind power solar energy mix generating system, has designed an energy management system management system, according to the system electricity generation, the load uses electricity the condition, the management system management system power supply pattern, nimbly adjusts each part to supply the electric quantity the proportion. The energy management system management system is bigger than the load demand when the renewable energy, shuts off the partial solar energies, the wind electrical machinery; When the renewable energy cannot satisfy the basic load request, in fully uses the renewable energy under the premise, is insufficient partially carries on the suitable supplement by the city electricity, takes the system the biggest load is 750 kW.In the power supply system, the system electricity generation and the load active power balance, is the system safe stable movement essential condition. Because the system load is provides by the Divulgate after the inversion, the DC voltage stable direct influence system provides the electrical energy to the load the quality, takes the system direct current voltage in here to control for the system the quantity, and dcUtakes its operating region is 192 V - 240V, chooses 216 V for the direct component rated voltage. In order to does not make the system the structure too to be complex, processing did not consider in here to the accumulator cell. Namely energy management system management system structure drawing like chart 2 – 2 show:, , , and difference for female line electric voltage, dcUWmPV1L2LPexportable and biggest power in the wind force machine, exportable and biggest power, system in the solar cell array of the direct current of the system a the type load the power and two loads needed need of power;and output to make use of the coefficient and the solar cell arrays to WKPVoutput the utilization for the wind force machine of the system with
respectively, namely
count to amount it with the wind force machine for the set that the wind force machine be in use than,
for the number and the solar energy array set total amount that the solar energy array be in use than. Take 、 ［0,0.2,0.4,0.6,0.8,1］ ， and mean the number that the set WKPV?WKPVnumber and the solar cell arrays that the wind force machine be in use be in use respectively;和 give or get an electric shock the switch control to change the quantity SK2Lfor the city respectively and two the types load of provide the rate, this text define 、 for the switch function, take the value “0“ or “1“; S2LWhen ＝１mean that the charged barbed wire net connects into the admixture to Kgenerate electricity the system, ＝0 mean that the charged barbed wire net SKgenerates electricity the system from the admixture to cut off; ＝１ mean that 2LKtwo loads connect into the admixture to generate electricity the system devotion work, = 0 mean that two loads generate electricity the system excision from the 2LKadmixture.Aim at the characteristics of the system movement, draw up the following design rule:(1)Rule aA power of the breeze electrical engineering capacity that constitutes to mix with to generate electricity the system is more and greatly, as a result the choice regard a power supply of the breeze electrical engineering as principle, the solar cell array is the energy tiny adjust the part.(2)Rule twoAccording to the system work characteristic, takes the direct current side terminal voltage expected value is 216 V, when the renewable energy may output dcUthe maximum work rate is bigger than the load request, the renewable energy to the electrical network does not transport the electrical energy.(3)Rule threeTakes when here the direct current generator voltage is lower than 192 V, through incorporates the controller to put through the electrical network, by the city electricity supplemented the load needs the short partial electrical energies, and the incorporation controller which the chapter introduced by this article behind causes the direct current generator voltage to maintain 192 V, namely ＝１SKWhen attracts 200 V, closure incorporation controller, then= 0S(4)Rule fourTwo loads are several: Generate electricity the system for the admixture in the electric power that the assistance facilities need, when can the renewable energy exportation electric power contain surplus of energy, the load that just throw in.In two kind of loads working condition, its load power examination has not been more difficult, in order to avoid two kind of loads frequently throwing ; This article according to the system the load disposition situation, supposes two kind of loads maximum works reties , when2mLP+ ＞ +WmPV1l2mLCirculate two load devotions, namely＝12LK(5)Rule fiveIn order to enhance the system direct component voltage the stability, when attracts 230 V, automatically two kind of loads investments movement, bcUnamely＝12LKWhen 240 V, the automatic excision all renewable energy electric power bcfacility carries on the power supply to the direct current generator, namely= = =0， ＝1WKPVS2LKInputs the multi- outputs, the change complex characteristic in view of the system, this system uses in the intelligent control the fuzzy control technology (Fuzzy Control, is called FC) to realize to the system carries on the management and the control; Studied and has designed one kind based on the graduation fuzzy control (Hierarchical Fuzzy Control, was called HFC) the algorithm energy management system management system.3.Misty controlsThe fuzzy set with the fuzzy control concept is by American University of California famous Professor L. A. Z a d e h in it Fuzzy Sets，F(xiàn)uzzy Algorithm and Rationale for Fuzzy Control and so on famously discusses center first was proposing one kind is completely different with the traditional mathematics and the control theory intelligent theory. Its production not only developed the broad classical mathematics foundation, moreover was causes the computer science to simulate the significant breakthrough which the human thought aspect developed.The faintness gather to come out the person's judgment, the thinking process with the direct expression of more simple language and mathematics forms. The mode of thinking that makes complicated system press mankind carry on operation and processing’s' make possible, lay the foundation for the formation of the misty controller, and get the scholar of the international community and the engineering technical personnel's extensive value and applications.The fuzzy control through the fuzzy set with the logical inference method person's experience formalization, the simulation, turns the control model and the language which the computer may accept, lets the computer replace the person to carry on the effective real-time control. Fuzzy controller composition diagram like chart 2 - 3 showIt include: The importation quantity faintness turns to connect, knowledge base( database and the rule database), reason logically the machine to reach agreement the faintness to connect.(1)The faintness turns to connectThe importation of the misty controller is usually certain quantity, must after faintness turn change into the language that controller know or change the quantity then can be use by the controller, the faintness turns to connect is to convert the certain importation quantity as the faintness to measure, it is also the importation of the misty controller to connect.(2)Knowledge baseThe knowledge base description form mainly has two kinds of: Database and rule database.Database is deposits all importations and output to change to measure of all misty son gather of belong to one degree relation of vector value; If in order to continue the area, the theory area database then for belong to the function correspond.The regular storehouse is the operator which and has the rich experience based on the expert knowledge acts according to the long-term accumulation the experience, according to person's intuition inference one language expression form. Most commonly used is if -then, else, also, or and so on, like 2 Uyghur fuzzy inference rule maybe represented asR: If (deviation is a; Bad rate of change is b;) Then (control measures is c;)The rule database is to is use to deposit all misty control rules, while reason logically provide the inferential basis for“ reason logically the machine“.(3)Reason logically to reach agreement the faintness to connectWhile reason logically, the controller reasons logically the machine according to